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Dissertations / Theses on the topic 'Power system control'
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1
Manansala, Edgardo Celestino. "Adaptive power system control." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54391.
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This work presents a centralized control scheme applied to a power system. The scheme has adaptive characteristics which allow the controller to keep track of the changing power system operating point and to control nonlinear functions of state variables. Feedback to the controller is obtained from phasor measurements at chosen power system buses, generator field voltage measurements, and state estimators. Control effort is aimed at minimizing the oscillations and influencing the power system state trajectory through the control of linear and nonlinear functions of state variables during a power system disturbance.
The main contributions of this dissertation are the simultaneous introduction and utilization of measurement based terms in the state and output equations in the derivation and implementation of the control law, the study of limits on controller performance as the state residual vector becomes very large, and the simulation of the performance of local state estimators to prove the need for faster phasor measurement systems.
The test system is a hypothetical 39-Bus AC power system consisting of typical components which have been sufficiently modelled for the simulation of power system performance in a dynamic stability study.<br>Ph. D.
2
Tai-Cheng, Yang. "Power system stabilizer design." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245278.
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Cheung, Siu-pan. "Direct transient stability margin assessment of power system with excitation control and SVC control /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1753706X.
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張小彬 and Siu-pan Cheung. "Direct transient stability margin assessment of power system with excitation control and SVC control." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31212979.
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Kreikebaum, Frank Karl. "Control of transmission system power flows." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50392.
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Power flow (PF) control can increase the utilization of the transmission system and connect lower cost generation with load. While PF controllers have demonstrated the ability to realize dynamic PF control for more than 25 years, PF control has been sparsely implemented.
This research re-examines PF control in light of the recent development of fractionally-rated PF controllers and the incremental power flow (IPF) control concept. IPF control is the transfer of an incremental quantity of power from a specified source bus to specified destination bus along a specified path without influencing power flows on circuits outside of the path.
The objectives of the research are to develop power system operation and planning methods compatible with IPF control, test the technical viability of IPF control, develop transmission planning frameworks leveraging PF and IPF control, develop power system operation and planning tools compatible with PF control, and quantify the impacts of PF and IPF control on multi-decade transmission planning.
The results suggest that planning and operation of the power system are feasible with PF controllers and may lead to cost savings. The proposed planning frameworks may incent transmission investment and be compatible with the existing transmission planning process. If the results of the planning tool demonstration scale to the national level, the annual savings in electricity expenditures would be $13 billion per year (2010$). The proposed incremental packetized energy concept may facilitate a reduction in the environmental impact of energy consumption and lead to additional cost savings.
6
Sanchez, Ayala Gerardo. "Centralized Control of Power System Stabilizers." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/51754.
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This study takes advantage of wide area measurements to propose a centralized nonlinear controller that acts on power system stabilizers, to cooperatively increase the damping of problematic small signal oscillations all over the system. The structure based on decision trees results in a simple, efficient, and dependable methodology that imposes much less computational burden than other nonlinear design approaches, making it a promising candidate for actual implementation by utilities and system operators.
Details are given to utilize existing stabilizers while causing minimum changes to the equipment, and warranting improvement or at least no detriment of current system behavior. This enables power system stabilizers to overcome their inherent limitation to act only on the basis of local measurements to damp a single target frequency. This study demonstrates the implications of this new input on mathematical models, and the control functionality that is made available by its incorporation to conventional stabilizers.
In preparation of the case of study, a heuristic dynamic reduction methodology is introduced that preserves a physical equivalent model, and that can be interpreted by any commercial software package. The steps of this method are general, versatile, and of easy adaptation to any particular power system model, with the aggregated value of producing a physical model as final result, that makes the approach appealing for industry. The accuracy of the resulting reduced network has been demonstrated with the model of the Central American System.<br>Ph. D.
7
Shafie-Pour, A. R. "Real-time power system security assessment." Thesis, Durham University, 1989. http://etheses.dur.ac.uk/9303/.
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The increasing complexity of modern power systems has led to a greater dependence on automatic control at all levels of operation. Large scale systems of which a power system is a prime example, is an area in which a wide gap exists between theoretical mathematically based research and engineering practice. The research programme at Durham is directed towards bridging this gap by linking some of the available and new theoretical techniques with the practical requirements of on-line computer control in power systems. This thesis is concerned with the assessment of security of power systems in real-time operation. The main objective of this work was to develop a package to be incorporated in the University of Durham On line Control of Electrical Power Systems (OCEPS) suite to cater for network islanding and analyse the features and the feasibility of a real-time 'security package’ for modern energy control centres. The real-time power systems simulator developed at Durham was used to test the algorithms and numerical results obtained are presented.
8
Falkner, Catherine M. "Robust output feedback controllers for power system stabilization." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/14802.
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Cimen, Hasan. "Decentralised power system load frequency controller design." Thesis, University of Sussex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244317.
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He, Fangpo. "Nonlinear adaptive control in the design of power system stabilisers /." Title page, contents and introduction only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phh431.pdf.
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Mehta, Mehul. "Power control for a mobile satellite system." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245306.
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Ilutu, Danny Makimi. "Linear power control system for a nanosatellite." Thesis, Cape Peninsula University of Technology, 2011. http://hdl.handle.net/20.500.11838/2202.
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Thesis (MTech(Electrical Engineering))--Cape Peninsula University of Technology, 2011.<br>Nanosatellite is an electronic device that requires a steady and reliable electrical power
supplier (EPS) in order to drive all its electronic circuits. Its unpredictable failures can lead to
extensive financial and time losses. The failures may be owing to the environment in which
the satellite operates; the technique and the method used to generate power. In order to
effectively minimise the risk of the EPS failures, a better technique is essential.
The direct energy transfer (DET) technique was chosen for this research because it provides
high efficiency and high reliability, unlike the maximum power point tracking (MPPT)
technique, which obtains maximum power from the solar cells by using a microcontroller.
DET works on a fixed working point of current-voltage characteristic and responds to all
satellite power system requirements.
The microcontroller is not a suitable device in satellite electrical power systems that requires
high reliability, but is used because it is difficult to track the maximum power of solar cells
without it. The analog MPPT system is another option, but the technique requires discrete
components. Its deployment is limited because of the system's operating frequency and
large electronic components such as the inductor and capacitor.
13
Looja, Tuladhar R. "Control of Custom Power System using Active Disturbance Rejection Control." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1438913443.
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Anderson, Sharon Lee. "Reduced order power system models for transient stability studies." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09052009-040743/.
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Song, Yang. "Design of secondary voltage and stability controls with multiple control objectives." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29714.
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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Begovic, Miroslav; Committee Member: Deng, Shijie; Committee Member: Divan, Deepakraj; Committee Member: Harley, Ronald; Committee Member: Lambert, Frank; Committee Member: Shamma, Jeff. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Yogendran, G. Henry. "Real time digital control system for power system analog simulator." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ53246.pdf.
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Oukati, Sadegh Mahmoud. "Control of power electronic devices (FACTS) to enhance power system stability." Thesis, University of Strathclyde, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275177.
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Burt, Graeme M. "An expert system approach to on-line fault diagnosis in power system networks." Thesis, University of Strathclyde, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340000.
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曾坤明 and Kwan-ming Tsang. "Decoupling and stabilizing control of multi-machine power systems withstatic VAr compensators." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31211008.
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De, Arizon Paloma. "Online power system security classifier and enhancement control." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0020/NQ48625.pdf.
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Peck, Nathan J. "PEAK POWER CONTROL WITH AN ENERGY MANAGEMENT SYSTEM." Monterey, California. Naval Postgraduate School, 2013. http://hdl.handle.net/10945/32884.
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The Department of Defense (DoD) is researching methods to enhance energy security and reduce energy costs. The energy security of DoD installations relies on the commercial electricity grid. One method being considered to improve energy security and reduce energy costs is microgrids that include combinations of energy storage, energy sources, critical loads, and non-critical loads. A microgrids power demand and the benefits of a microgrid integrated with a power electronics enabled Energy Management System (EMS) is investigated in this thesis. The power demand of a single family household is analyzed. The peak power demand of the single family household displays the drawbacks of peak power demand on the commercial electricity grid and the installations receiving power from it. Drawbacks include reduced energy security due to blackouts and increased cost as a result of meeting the peak demand. One benefit of an EMS is its ability to island or continue supplying power to critical loads when the commercial electricity grid is lost. A second benefit is reduced power demand on the commercial electricity grid during peak power demand or on distributed resources (DR) while islanded by performing peak power control. The performance of peak power control by an EMS is demonstrated using a Simulink model and an experimental laboratory setup. The Simulink model and EMS functionality are validated with the laboratory experiments. The Simulink model is then used to demonstrate the reduction in peak power demand on the commercial electricity grid using an EMS on more complex loads such as motors and diode rectifiers. The Simulink model is also used to compare the power demand on the commercial electricity grid with and without the EMS.
22
Cintuglu, Mehmet Hazar. "Wide-Area Time-Synchronized Closed-Loop Control of Power Systems And Decentralized Active Distribution Networks." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/3031.
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The rapidly expanding power system grid infrastructure and the need to reduce the occurrence of major blackouts and prevention or hardening of systems against cyber-attacks, have led to increased interest in the improved resilience of the electrical grid. Distributed and decentralized control have been widely applied to computer science research. However, for power system applications, the real-time application of decentralized and distributed control algorithms introduce several challenges. In this dissertation, new algorithms and methods for decentralized control, protection and energy management of Wide Area Monitoring, Protection and Control (WAMPAC) and the Active Distribution Network (ADN) are developed to improve the resiliency of the power system. To evaluate the findings of this dissertation, a laboratory-scale integrated Wide WAMPAC and ADN control platform was designed and implemented. The developed platform consists of phasor measurement units (PMU), intelligent electronic devices (IED) and programmable logic controllers (PLC). On top of the designed hardware control platform, a multi-agent cyber-physical interoperability viii framework was developed for real-time verification of the developed decentralized and distributed algorithms using local wireless and Internet-based cloud communication. A novel real-time multiagent system interoperability testbed was developed to enable utility independent private microgrids standardized interoperability framework and define behavioral models for expandability and plug-and-play operation. The state-of-theart power system multiagent framework is improved by providing specific attributes and a deliberative behavior modeling capability. The proposed multi-agent framework is validated in a laboratory based testbed involving developed intelligent electronic device prototypes and actual microgrid setups. Experimental results are demonstrated for both decentralized and distributed control approaches. A new adaptive real-time protection and remedial action scheme (RAS) method using agent-based distributed communication was developed for autonomous hybrid AC/DC microgrids to increase resiliency and continuous operability after fault conditions. Unlike the conventional consecutive time delay-based overcurrent protection schemes, the developed technique defines a selectivity mechanism considering the RAS of the microgrid after fault instant based on feeder characteristics and the location of the IEDs. The experimental results showed a significant improvement in terms of resiliency of microgrids through protection using agent-based distributed communication.
23
Khan, Sheroz. "Coordinated protection and control in power systems : an expert system approach to interlocking management." Thesis, University of Strathclyde, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338913.
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Thompson, John Gerard. "Emergency control of frequency in an isloated power system." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334492.
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Wu, Qiang. "Dynamics and coordinated control of voltage behavior in power systems." Thesis, The University of Sydney, 2000. https://hdl.handle.net/2123/27766.
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This thesis presents results on the dynamics and coordinated control of voltage behavior
in power systems.
The first part of the thesis is on dynamic modeling, with emphasis on tap-changing
transformers and load dynamics. For both, highly simplified models are used in voltage
stability analysis, despite the complex nature of the devices involved, i.e. tap changing
operation and aggregate load. The operating conditions, under which the stability results
based on these simplified models are reliable need to be clarified. A study is carried
out on the influence of diiferent discrete and continuous tap models on voltage stability
properties, particularly when combined with load dynamics. It has been found that
small disturbance analysis, especially if based on the common continuous tap model with
fixed time constant, is often an unreliable indicator of system stability. Some important
differences in system responses with continuous and discrete tap models are highlighted
along with the conditions under which they occur.
Limit cycles are shown to characterize the system responses with discrete tap models. The
limit cycles originate from the deadband nonlinearity embedded in the discrete tap operation
and tap-load interactions. Describing functions for the nonlinearity of the discrete
tap operation are derived and used to predict the existence of limit cycles. Furthermore,
the feasibility of avoiding the limit cycles through adjusting deadband size is investigated.
It has been shown that whether or not increasing deadband can always eliminate
the existing limit cycle depends on the associated load dynamics.
Following this, attention is given to load dynamics modeling. The focus is on use of
generic dynamic load models. A simulation study is given on system behavior with generic
dynamic loads as compared with the detailed physically based load models which they ap—
proximate. Several simple and a more complicated load structures are considered, which
include lower voltage tap changers, induction motors, thermostatically controlled heating
and static load. It has been shown, for simple load structures, generic dynamic load models,
if the parameters are properly identified, provide fairly accurate prediction of system
stability behavior in all cases except the one with high percentage of induction motors.
On the other hand, for a load structure with diverse compositions, generic dynamic load
models have practically useful accuracy for representing the load. This suggests that ap—
plying generic dynamic load models will be practically useful in reducing the complexity
of system modeling and give reliable stability analysis results.
The second part of the thesis is devoted to coordinated voltage control. A general frame
work for coordinating optimally a diverse set of control actions is established. The benefit
of control coordination is illustrated through a case study on coordination of capacitor
switching and tap locking. By careful coordination of these controls, voltage collapse can
be arrested with less overall control effort and less impact on the voltage profile than by
either acting along.
An analytical framework for coordinated voltage control based on coordination of dissimilar
control actions is then presented. A 4-stage optimal control scheme is proposed along
with detailed formulations. In the first three stages, a security constrained steady—state
approach is used to define the optimal control direction for providing stability and adequate
security margin. An algorithm based on differential dynamic programming based
is then used to optimally schedule controls with different response time and dynamics.
Finally, the dynamic sensitivity-based method is employed to refine the obtained control
sequence; in terms of finding the optimal switching times for the control actions identified
in earlier stages.
In the final study of the thesis, application is made of the stability analysis and coordinated
control techniques to a substantial physical power system, namely the New South Wales
power grid. The algorithm and techniques proposed in previous chapters is tested in a
more practical situation.
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Abdelaal, Ashraf Khalil Ibrahim. "Expert system applications to electrical power system voltage control and security." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366882.
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Farsangi, Malihe Maghfouri. "Robust control of flexible AC transmission systems for damping power system oscillations." Thesis, Brunel University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269400.
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Zhang, Yang. "Design of wide-area damping control systems for power system low-frequency inter-area oscillations." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Fall2007/y_zhang_112007.pdf.
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Athanasius, Germane Information Technology & Electrical Engineering Australian Defence Force Academy UNSW. "Robust decentralised output feedback control of interconnected grid system." Awarded by:University of New South Wales - Australian Defence Force Academy, 2008. http://handle.unsw.edu.au/1959.4/39591.
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The novel contribution of the thesis is the design and implementation of decentralised output feedback power system controllers for power oscillation damping (POD) over the entire operating regime of the power system. The POD controllers are designed for the linearised models of the nonlinear power system dynamics. The linearised models are combined and treated as parameter varying switched systems. The thesis contains novel results for the controller design, bumpless switching and stability analysis of such switched systems. Use of switched controllers against the present trend of having single controller helps to reduce the conservatism and to increase the uncertainty handling capability of the power system controller design. Minimax-LQG control design method is used for the controller design. Minimax-LQG control combines the advantages of both LQG and H control methods with respect to robustness and the inclusion of uncertainty and noise in the controller design. Also, minimax-LQG control allows the use of multiple integral quadratic constraints to bound the different types of uncertainties in the power system application. During switching between controllers, switching stability of the system is guaranteed by constraining the minimum time between two consecutive switchings. An expression is developed to compute the minimum time required between switchings including the effect of jumps in the states. Bumpless switching scheme is used to minimise the switching transients which occur when the controllers are switched. Another contribution of the thesis is to include the effect of on load tap changing transformers in the power system controller design. A simplified power system model linking generator and tap changing transformer dynamics is developed for this purpose and included in the controller design. The performance of the proposed linear controllers are validated by nonlinear computer simulations and through real time digital simulations. The designed controllers improve power system damping and provide uniform performance over the entire operating regime of the generator.
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Yang, Xue Jiao. "Supervisory wide-area control for multi-machine power system." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/supervisory-widearea-control-for-multimachine-power-system(6c0575f9-7b20-4751-9d67-276aaaa4c7b2).html.
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With the increasing demand for electrical power and the growing need for the restructuring of the power industry, electric power systems have become highly complex with inherent complicated dynamics. Therefore, the study of power system stability has continued to receive significant attention from both academic researchers and industrial practitioners. This thesis focuses on supervisory wide-area control for rotor angle stability of multi-machine power systems using Linear Quadratic Gaussian/Loop Transfer Recovery (LQG/LTR) control theory with guaranteed robustness. The supervisory controllers are developed in both continuous-time and discrete-time framework and their performances and robustness are assessed using both frequency-domain tools, and time-domain simulation results. The impact of the communication time-delays that commonly exist in wide-area power system control on the performance and robustness of the closed-loop system is investigated. In particular, different methods of incorporating such time-delays into the design of the supervisory LQG controller are considered. This thesis proposes a modified supervisory LQG controller that utilizes the Extended Kalman Filter to estimate the unknown/varying time-delays. Simulation results obtained using numerical examples involving non-linear power system models demonstrate the benefits of the proposed scheme for both time-invariant and time-varying delays. The resulting supervisory control scheme is well suited for maintaining power system stability in the presence of communication time-delays.
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Godart, Thierry F. "An expert system approach to voltage control design and operation in power systems." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/15787.
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Uurtonen, Tommi. "Optimized Power Control for CDMA System using Channel Prediction." Thesis, Linköping University, Department of Science and Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-3697.
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<p>In an optimal power control scheme for a Code Division Multiple Access (CDMA) system all mobile stations signals should arrive to the base station at equal power. If not, stronger singals may cause too much interference and block out weaker ones. Commonly used power control schemes utilizes the Signal to Interference Ratio (SIR) to design a Power Control Command (PCC) to adjust the transmit power of the mobile station. A significant problem within the conventional methods is the slow SIR recovery due to deep channel fades. Conventional methods base the PCC on the previous channel state when in fact, the channel state may have significantly changed when transmission occurs. These channel changes may cause the SIR to drop or rise drastically and lead to uncontrollable Multi Access Interference (MAI) resulting in power escalation and making the system unstable. In order to overcome power escalation and improve the recovery from deep fades a novel power control method has been developed. Based on Linear Quadratic Control and Kalman filtering for channel prediction this method designs the PCC based on the coming channel state instead of the current. This optimizes the PCC for the channel state where transmission occurs. Simulations show that this control scheme outperforms previous methods by making the impacts of the deep fades less severe on the SIR and also improves the overall SIR behaviour.</p>
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Yao, Bo 1968. "Priority mechanism for QoS control in CDMA system through dynamic power control." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79272.
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Future wireless systems will have to support multimedia services such as voice, data and video. Issues in providing multimedia services on wireless systems include multiple access, bandwidth rationing, scheduling and power control. In this thesis, we address the last issue. CDMA is assumed to be the access method. Each of these services has different Quality of Service (QoS) requirements, maximum power and packet time-out constraints; in order to achieve the required QoS, they can alter their transmission. In this work, we present a novel Power Control With Priority Scheduling (PCWPS) algorithm for a wireless CDMA system, which achieves reliability and efficiently control packet loss due to timeout violation for simultaneously transmitted multimedia traffic, as well as minimizing system total interference. Our power control algorithm requires information about each traffic class instant state, as well as the wireless channel condition at the beginning power update iteration. Based on this information, the optimum allocated power can be calculated through linear or nonlinear programming methods. The simulation results show that our algorithm achieves good performance in term of packet loss due to timeout.
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Azzeh, Abdel Rahman. "CAN Control System for an Electric Vehicle." Thesis, University of Canterbury. Electrical and Computer Engineering, 2007. http://hdl.handle.net/10092/1127.
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The University of Canterbury has purchased a 1992 Toyota MR2 and used it as the platform to construct a new electric car. Similar to the common combustion engine vehicle, electric vehicles require control systems to control the operation of 12Vdc auxiliary loads, such as lights, indicators and windscreen wipers, where traditional technology results in a large number of wires in the wiring harness. Also, with the added complexity of modern vehicles, the need for integrating independent control systems together has become very important in providing safer and more efficient vehicles. To reduce the number of wires and make it possible for different control systems to communicate, and so perform more complex tasks, a flexible and reliable control system is used. The CAN (Controller Area Network) control system is a simple two-wire differential serial bus system, which was developed by Bosch for automotive applications in the early 1980s. The power and control system within the vehicle is named the "Power Distribution Network" and it is implemented by using multiple power converters and the CAN control system. This thesis presents the design, implementation, and test results of the CAN control system for the MR2. The 312Vdc nominal battery voltage is converted to an intermediate voltage of 48Vdc. This configuration is considered more efficient than the usual 12Vdc distribution system since smaller and lighter wires can be used to carry the same amount of power. The power distribution network operates off the 48Vdc intermediate voltage, and provides 12Vdc output to power all auxiliaries within the vehicle. The Power Distribution Network is implemented with two major subsystems: the auxiliary power system, which consists of multiple converters to step-down voltage from the 48Vdc intermediate voltage to the 12Vdc, and the CAN control system, which is developed to control and integrate the 12Vdc auxiliary loads within the vehicle. The prototype CAN control system is fully operational and has been tested with 12Vdc loads which are used to simulate most of the auxiliary loads in the vehicle. Experimental measurements show that the prototype is able to successfully control and maintain the network of independent nodes. This confirms that in principle the CAN control system is suitable for controlling the auxiliary loads in an electric vehicle.
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Newman, Michael John 1976. "Design and control of a Universal Custom Power Conditioner (UCPC)." Monash University, Dept. of Electrical and Computer Systems Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/5651.
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Singh, B. "Microprocessor control and instrumentation of electrical power systems." Thesis, University of Bradford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379865.
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Lu, Shili. "Stochastic power control for wireless networks: Probabilistic QoS measures." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/26964.
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For wireless network systems, iterative power control algorithms have been proposed to minimize the transmission power, while maintaining reliable communication and base stations. However, since the measurements are random, the channel characteristics always are described by Stochastic Differential Equations (SDE). Based on the stochastic approximation methods, and using time-varying step size sequences, we can get an approximation algorithm to reach an optimal power allocation.
After the study of optimal power allocation, the probabilistic Quality of Service (QoS) measures are introduced to evaluate the performance of any control strategy. It provides tight bounds that relate to the probability of failure in achieving the desired QoS requirements.
This thesis addresses mobile systems consisting of M transmitters and M receivers, which are subject to motion, and their power is described by SDE. The optimal power control problem is formulated, and the outage probability corresponding to a desired QoS requirements is computed using Moment Generating Function (MGF).
Numerical results show that each user needs only to know its own channel gain and its own output assigned by the base station to update the transmitter power in order to maintain a desired Signal to Interference Ratio (SIR) and QoS requirement at the receiver.
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Kalitjuka, Tatjana. "Control of Voltage Source Converters for Power System Applications." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14370.
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The research work is aimed on the investigation of possible modeling and control schemes for the dc-link of VSC, with the purpose of identifying the impact of such modeling and control on the dynamics of the conversion system. A system consisting of back-to-back converters with equivalent grid interconnection and source representation is designed in the software PSCAD/EMTDC using a detailed switching model of the inverter and rectifier components. The control technique based on the well-established concept of vector control is implemented. The main task of the master thesis is oriented towards the achievement of more reliable dc-link dynamics with smaller required capacitance. The control algorithm is based on balancing the power between inverter and rectifier through the dc-link with the minimum dc voltage variations. Dc-link voltage regulation is achieved by implementing a control based on the energy stored in the dc-link capacitor. Alignment to a dq synchronous reference frame orientation with PI regulators is used in the control philosophy for decoupling purposes.
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Mensah, Edoe F. Kwatny Harry G. "Logic-based optimal control for shipboard power system management /." Philadelphia, Pa. : Drexel University, 2008. http://hdl.handle.net/1860/2765.
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Selders, Robert L. (Robert Lee). "A current-balancing control system for cellular power converters." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/11296.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.<br>Includes bibliographical references (p. 85-87).<br>by Robert L. Selders, Jr.<br>M.S.
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邱魏豪麒. "Power Control in CDMA System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/87472285599645926561.
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碩士<br>大葉大學<br>電機工程研究所<br>89<br>The power estimation and power control in W-CDMA radio systems employing array antennae are investigated, and the associate simulations are performed to verify the system performance. We begin with theoretic analysis of the estimation scheme for the received power under multi-rate transmission, and follow by simulation to verify the performance of the estimation scheme and to evaluate the performance of the fixed step-size power control scheme. As the received bit-energy-to-interference power spectral density (PSD) ratio is log normally distributed, the standard deviation is therefore used as a criterion for evaluating the system performance.
In received power estimation, the mean of the received bit-energy-to-interference PSD ratio for the single-user beam has an error of 0.4 ~ 0.6 dB, which is irrelevant to the averaging period and spreading factor, while the standard deviation of the received bit-energy-to-interference PSD ratio decreases as the averaging period increases. The standard deviation is 0.16~0.84 dB for an average period of 1.625 ms. For multiple users in a beam, the number of users has no significant effect on the estimation performance. Finally, the simulation of power control system by combining the proposed power estimation and power control scheme is performed for a RAKE receiver having three taps, and the standard deviation of the received bit-energy-to-interference PSD ratio is less than 2 dB for a spreading factor greater than eight, while the standard deviation becomes 4.5dB for a spreading factor of four.
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Chang, Chien-Ta, and 張建達. "Wind Power Control System Design." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/43547913153453291165.
Full textAbstract:
碩士<br>國立高雄應用科技大學<br>電機工程系博碩士班<br>96<br>This thesis aims to integration design of wind power control systems.The
system combines the vertical-axis rotor permanent magnet synchronous generators,
three-phase rectifier circuit DC to DC switching converters, lifting pressure
switch,energy storage devices, DC to DC converters. Through the power conversion,
the wind power will be stored in the battery for DC load . The thesie uses the
latest wave of DC and pulse width modulation (PWM), to improve the efficiency
of energy conversion. For the protection of wind turbine generators and power
conversion control devices, remote monitoring network is used to monitoring the
wind turbine operating system. This increase the safety of operations. With the
load monitoring system, the wind generator output and the wind turbine can be
observed.
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Wu, Chien-Hsin, and 吳建欣. "An Implementation of Power Monitoring and Control System for Campus Power Systems." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/38257308169528988421.
Full textAbstract:
碩士<br>國立臺灣大學<br>電機工程學研究所<br>91<br>This paper presents an implementation of power monitoring and control system which enhance the users to know their conditions of power using and find a way of reducing the operating costs. With the system, the users could make a reasonable utility contract in accordance with the conditions and characters of the loads, moreover, it could restrain the peak loads and reduce costs in the same time. Now we illustrate our research for each core software functions of the system. These functions are described in the following sections : 1.The main system setting, including communication and digital power meter settings; 2.Power consumption analysis, including real-time and history power consumption analysis; 3.Employing Artificial Neural Network to do load forecast; 4.In accordance with “Ameliorated Multi-Pass Dynamic Programming” and Taipower’s Rates to sign the optimal utility contracts; 5.To proceed useful and immediate load management for air conditioner; 6.Using “Discrete Fourier Transform Algorithm” to do harmonic analysis; 7.Report function. This is a powerful and good flexible system which is suitable for many different users. Not only it can reduce the costs and increase the efficiency of power using, also enhance the stability and reliability of the power system during the peak loads period in summer.
Finally, we give you a example, “A Scheme of NTU Power Management”. It says that, when the users don’t know their conditions of power using and the power supply demands increase rapidly. Not only causing a huge loads for power system supply, also having weighty bill of school annual expenditures for a fine of over utility contract. For solving this problem, it is necessary to plan a suitable power system to save the energy and decrease the fine. So, in this paper, we would do a detailed description.
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Dora, Gouri Shankar, and Monali Madhulita. "Control techniques for power system stabilisation." Thesis, 2013. http://ethesis.nitrkl.ac.in/4776/1/109EE0269.pdf.
Full textAbstract:
The conventional PSS was first proposed earlier based on a linear model of the power system to damp the low frequency oscillations in the system. But they are designed to be operated under fixed parameters derived from the system linearized model. Due to large interconnection of power system to meet the load demand brings in deviations of steady-state and non-linearity to power system. The main problem is that PSS includes the locally measured quantities only neglecting the effect of nearby generators. This is the reason for the advent of Wide area monitoring for strong coupling between the local modes and the inter-area modes which would make the tuning of local PSSs for damping all modes nearly impossible when there is no supervisory level controller. Wide area control addresses these problems by proposing smart topology changes and control actions. Dynamic islanding and fast load shedding are schemes available to maintain as much as possible healthy transmission system. It is found that if remote signals from one or more distant locations of the power system can be applied to local controller design, system dynamic performance can be enhanced. In order to attain these goals, it is desirable to systematically build a robust wide area controller model within an autonomous system framework.
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Yang, Shih-Hao, and 楊世豪. "Power Control Algorithm for Multicarrier System." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/19989285358953798317.
Full textAbstract:
碩士<br>國立暨南國際大學<br>通訊工程研究所<br>93<br>In the next generation communication, in order to enable high data rate communications and alleviate the multipath induced intersymbol interference (ISI), the multicarrier modulation is used in wireless cellular networks. On the other hand, power control is an important technique in enhancing the spectral and power efficiency. Therefore, we study the combination of power control and multicarrier communications in this thesis. We first study the power control algorithm to meet the link quality for all the subchannels. From simulation results, we found that this approach deteriorates the power control stability in the multicell network due to the lack of frequency diversity. Then we study the power allocation and control algorithm that applies soft-decoding BER bound to gain frequency diversity advantage. It is shown through simulation results that the studied algorithm provides lower outage probability. At last, we imply the distributed constrained power control (DCPC) on these studied algorithm to keep the transmitter power smaller than the power constraint.
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Chang, Chien-tsung, and 張建聰. "Switchyard Control Room Power Scada System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/95981105331854524277.
Full textAbstract:
碩士<br>逢甲大學<br>資訊電機工程碩士在職專班<br>97<br>「Switchyard Control Room Power Scada System」is a system that is devoted to the remote power monitoring and the dispatch at the switchyard in the power plant. The switchyard is built primarily to connect the power that is produced by generation system and provider system in the power plant. Now, the switchyard is disposed four shifts personnel in shifts, and all of the controls （e.g. state monitor and value record）are operated by personnel at the switchyard.
Presently, there are ten generator sets built in power plant. Each generator set has its control room. It is beneficial for the power plant to replace the existing switchyard by an unmanned style with the capability of remote control to save the cost of manpower.
This thesis is dedicated to a「Switchyard Control Room Power Scada System」, including complete switch equipment and control, monitor and data acquisition about ten generator sets. The control, monitor and data acquisition of equipments of switchyard can be executed in personal computer. It can achieve the function of remote control by Ethernet and industry standard communication interface to connect remote terminal units, control room of generator sets and plant information system.
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Wu, Sheng Fu, and 巫勝富. "Wireless Remote Power Saving Control System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/55938616059942119623.
Full textAbstract:
碩士<br>國立臺北大學<br>資通科技產業碩士專班<br>102<br>This thesis adapts ZigBee, a wireless sensor network technology, and combines a power monitoring chip and power control switch to present an integrated remote power saving control solution. Based on this approach, devices can perform power saving and safety monitoring as an intelligent building for companies and families.
Based on ZigBee capabilities of low power, low cost, high performance, self-healing, and interference resistance, our implementation is developed upon Texas Instrument MSP430 AFE253 (AC meter IC) and CC2531(ZigBee IC), which are linked by UART interfaces. Through realistic accuracy testing and adjustments, the experiments simulate efficient ZigBee wireless transmissions for evaluating the wireless power monitoring system, which includes multiple wireless devices. By the integration of hardware and software as well as wireless technology adaption, This paper successfully accomplish the wireless remote power saving control system.TTT
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Lu, Chun-Hung, and 呂俊鴻. "Intelligent Voice-Control Power Wheelchair System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/62318715199506976930.
Full textAbstract:
碩士<br>德明財經科技大學<br>資訊管理系<br>102<br>Nowadays, the population of the elderly grows fast in Taiwan. The power wheelchair thus becomes necessary equipment for the elderly. Because of the illness and weakness, some of the elderly have difficulty to control the wheelchair by hand. Besides the elderly, some of the disabled need the power wheelchair to move around in their daily lives. Therefore, a power wheelchair system with voice-controlled function is proposed in this thesis to help those who have problem to control the power wheelchair by hand instead of controlling the power wheel chair by voice commands sent from microphone via Bluetooth system. The voice-controlled model not only uses voice to control power wheelchair direction, but also can integrate with automatic navigation model to go right spot by setting path previouly. Moreover, the system provides button control model and gyro control model which can be provided for anyone to control power wheelchair. The Wi-Fi wireless network system and Android system based smartphones are another two major parts of the proposed scheme. The automatic alert system has been also developed to call for help and GPS position by the smartphone when any dangerous situation occurred. The proposed control system can help the elder users of the power wheelchair to have a better quality of life.
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Chih-Cheng, Wang, and 王至誠. "Hydro Power Plant Control System Retrofit." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/81711901962538677463.
Full textAbstract:
碩士<br>國立高雄應用科技大學<br>電機工程系博碩士班<br>102<br>This thesis presents the hydro power plant control system retrofit. For many years commencial operating hydro power plant, the parts of plant control system were stopping production because of parts and technics upgrade. It takes very high cost to purchase spare parts from original supplier or OEM manufacture. Also the existing control system in hydro power plant was running abnormal because of aging of existing parts. If we can define hydro control system retrofit standard procedure. Not only faster the control system retrofit speed, also can use newest technics and better solution for retrofitting. If new retrofitting control system were not suited to exsting operating machine. Once the old control system was took off. The existing machine tuning parameter was gone too. This may cause retrofit job fail. The plant cannot generate power and customer not accept for this issue. Or the new control system cannot get accurtae parameter from OEM manufaturer. It may cause machine runing at low effeniciency condition.
This study is to define control system retrofit procedure. Follow this procedure and apply for Dachshi Hydro plant control, switch yard control, remote control and gate control retroftting job executing. Follow this procedure and apply for LiuQueng Hydro Governor control system retrofit job too. Both retrofit projects were sucessful. The standard procedure will make sure each component function well. For total plant operating effenicency, it needs experience and technical expertise to adjust system. Finally, the proposed experience and result obtained can be guided to the work on other control system retrofit.
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Behera, Niranjan. "Load frequency control of power system." Thesis, 2013. http://ethesis.nitrkl.ac.in/5238/1/211EE3335.pdf.
Full textAbstract:
In case of an interconnected power system, any small sudden load change in any of the areas causes the fluctuation of the frequencies of each and every area and also there is fluctuation of power in tie line. The main goals of Load Frequency control (LFC) are, to maintain the real frequency and the desired power output (megawatt) in the interconnected power system and to control the change in tie line power between control areas. So, a LFC scheme basically incorporates a appropriate control system for an interconnected power system, which is heaving the capability to bring the frequencies of each area and the tie line powers back to original set point values or very nearer to set point values effectively after the load change. This is achieved by the use of conventional controllers. But the conventional controllers are heaving some demerits like; they are very slow in operation, they do not care about the inherent nonlinearities of different power system component, it is very hard to decide the gain of the integrator setting according to changes in the operating point. Advance control system has a lot of advantage over conventional integral controller. They are much faster than integral controllers and also they give better stability response than integral controllers. In this proposed research work advanced control technique (optimal controller, optimal compensator) and IMC-PID control technique has been applied for LFC of two area power systems. The optimal controllers and compensators are capable of working without full state feedback and at the presence of process and measurement noise. The IMC-PID controller is capable of giving better response and is applicable under different nonlinearities.