Bibliografie tematiche / COMMON COUPLING POINT (CCP)

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Letteratura scientifica selezionata sul tema "COMMON COUPLING POINT (CCP)"

Autore: Grafiati

Pubblicato: 11 settembre 2023

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Articoli di riviste sul tema "COMMON COUPLING POINT (CCP)"

Coman, Ciprian Mihai, Adriana Florescu e Constantin Daniel Oancea. "Improving the Efficiency and Sustainability of Power Systems Using Distributed Power Factor Correction Methods". Sustainability 12, n. 8 (13 aprile 2020): 3134. http://dx.doi.org/10.3390/su12083134.

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For the equipment connected to the three-phase or single-phase grid, the power factor represents an efficiency measure for the usage of electrical energy. The power factor improvement through correction methods reduces the load on the transformers and power conductors, leading to a reduction of losses in the mains power supply and a sustainable grid system. The implications at the financial level are also important. An example of load that generates a small power factor is represented by a motor without mechanical load or having a small mechanical load. Given the power factor correction (PFC), the costs are reduced through the elimination of penalties, applying only in the common coupling point (CCP). The advantages of using equipment for the power factor correction are related also to their long operation duration and the easiness of their installation. The device presented in this article takes advantage of the advances in information and communication technology (ICT) to create a new approach for telemetry and remote configuration of a PFC. This approach has flexibility and versatility, such that it can be adapted to many loads, easily changing the capacitance steps and settings of the power factor correction device.

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Maataoui, Yassir, Hamid Chekenbah, Omar Boutfarjoute, Vicenç Puig e Rafik Lasri. "A Coordinated Voltage Regulation Algorithm of a Power Distribution Grid with Multiple Photovoltaic Distributed Generators Based on Active Power Curtailment and On-Line Tap Changer". Energies 16, n. 14 (10 luglio 2023): 5279. http://dx.doi.org/10.3390/en16145279.

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The aim of this research is to manage the voltage of an active distribution grid with a low X/R ratio and multiple Photovoltaic Distributed Generators (PVDGs) operating under varying conditions. This is achieved by providing a methodology for coordinating three voltage-based controllers implementing an Adaptive Neuro-Fuzzy Inference System (ANFIS). The first controller is for the On-Line Tap Changer (OLTC), which computes its adequate voltage reference. Whereas the second determines the required Active Power Curtailment (APC) setpoint for PVDG units with the aim of regulating the voltage magnitude and preventing continuous tap operation (the hunting problem) of OLTC. Finally, the last component is an auxiliary controller designed for reactive power adjustment. Its function is to manage voltage at the Common Coupling Point (CCP) within the network. This regulation not only aids in preventing undue stress on the OLTC but also contributes to a modest reduction in active power generated by PVDGs. The algorithm coordinating between these three controllers is simulated in MATLAB/SIMULINK and tested on a modified IEEE 33-bus power distribution grid (PDG). The results revealed the efficacy of the adopted algorithm in regulating voltage magnitudes in all buses compared to the traditional control method.

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Grigoraș, Gheorghe, Livia Noroc, Ecaterina Chelaru, Florina Scarlatache, Bogdan-Constantin Neagu, Ovidiu Ivanov e Mihai Gavrilaș. "Coordinated Control of Single-Phase End-Users for Phase Load Balancing in Active Electric Distribution Networks". Mathematics 9, n. 21 (21 ottobre 2021): 2662. http://dx.doi.org/10.3390/math9212662.

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In the paper, a coordinated control methodology of single-phase (1-P) end-users switching operations on the phases of an active electric distribution network (AEDN) has been proposed to obtain a minimum unbalance degree at the coupling common point (CCP) level with the main distribution system. The phase load balancing (PLB) process considers the smart devices that switch the 1-P end-users (consumers and prosumers) from one phase to another to compensate for the phase load unbalance. The proposed methodology has been tested successfully in an AEDN belonging to a Romanian Distribution Network Operator (DNO) containing 114 end-users (104 consumers/10 prosumers) integrated into the Smart Metering System (SMS). The optimal solution leads to a value of the objective function by 1.00, represented by the unbalance factor (UF), which could be identified with the ideal target. A comparative analysis was conducted considering other possible PLB cases (the consumer-level PLB and prosumer-level PLB), obtaining similar values of the UF (1.027 vs. 1.028), slightly higher than in the hybrid-level PLB. Additionally, the significant technical benefits were quantified through an energy-saving of 58.73% and decreasing the phase voltage unbalance rate by 91% compared to the initial case (without PLB). These results emphasized the positive impact of the proposed coordinated control methodology on the PLB process and evidenced its effectiveness and applicability in the AEDNs.

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Mohammed, Saidu Kumo, Norman Mariun, Mohd Amran Mohd Radzi e Noor Izzri Abdul Wahab. "Impact of Inverter Controller on Efficiency and Islanding of Photovoltaic Distributed Generation". Applied Mechanics and Materials 785 (agosto 2015): 167–71. http://dx.doi.org/10.4028/www.scientific.net/amm.785.167.

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The increasing penetration of photovoltaic (PV) Distributed Generation (DG) systems in the electric power distribution system necessitates the development of power electronics inverter to interface the PV DG with the grid. The output parameters of the DG are determined by the inverter control strategy. An open-loop control (NCTRL) and two close-loop controls; Constant-Current Control (CCC) and Constant-Power Control (CPC) were considered for the inverter. The impact of inverter control techniques are compared based on power transformation efficiency and islanding behaviour of the DG. A grid-connected PV DG and the control techniques were simulated using MATLAB Simulink. A mathematical formulation of the inverter islanding voltage at the point of common coupling was driven and validated by simulation. Results indicated that a closed loop control of inverter is essential for maximum efficiency and stability of DG in post islanding

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Baan, Mirko van der. "Processing of anisotropic data in the τ-p domain: II — Common-conversion-point sorting". GEOPHYSICS 70, n. 4 (luglio 2005): D29—D36. http://dx.doi.org/10.1190/1.1993708.

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Common-conversion-point (CCP) sorting of P-SV converted-wave data is conventionally done by first sorting data into common asymptotic-conversion-point (CACP) gathers and then computing the involved CCP shifts from analytic approximations. I explore an alternative method where the latter step is replaced by an entirely data-driven approach. Moveout curves of correlated P-P and P-SV reflections in collocated CMP and CACP gathers are first scanned for points of equal slowness. A common-source slowness indicates that the downgoing branches of the P-P and P-SV waves overlap if the conversion occurs at the reflecting interface. The P-SV conversion point is then assumed to be situated underneath the associated P-P wave midpoint. A migration of amplitudes from CACP to CCP gathers is straightforward once the exact CCP position is known. This data-driven approach requires kinematic information only and is exact for laterally homogeneous media with arbitrary strength of anisotropy if horizontal symmetry planes are present at all depths. Both time-offset and τ-p domain implementations are possible, although the latter are preferred.

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MacArthur, Sandra L., Matthew D. Johnson e Daniel D. Lewis. "Biomechanical Comparison of Two Conical Coupling Plate Constructs for Cat Tibial Fracture Stabilization". Veterinary and Comparative Orthopaedics and Traumatology 33, n. 04 (21 aprile 2020): 252–57. http://dx.doi.org/10.1055/s-0040-1708497.

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Abstract Objective This study aimed to compare the biomechanical characteristics of two conical coupling plate (CCP) constructs in an ex vivo feline tibial fracture gap model. Study Design Paired tibiae harvested from eight recently euthanatized cats were alternately assigned to one of two stabilization groups. One tibia was stabilized with a standard, 6-hole, 2.5-mm CCP and the contralateral tibia was stabilized with a 6-hole, 2.5-mm prototype CCP (pCCP). Non-destructive cyclic four-point craniocaudal bending, mediolateral bending and axial compression testing were performed, and stiffness was recorded. The specimens were then loaded to failure in axial compression, and yield and failure loads were recorded. Results During non-destructive testing, the pCCP constructs were significantly stiffer than the CCP constructs in both modes of bending and axial loading. Both constructs demonstrated significantly greater craniocaudal bending stiffness compared with mediolateral bending. Yield load and failure load were significantly greater for the pCCP constructs. Conclusion The augmented design of the pCCP yielded superior mechanical characteristics during both non-destructive and destructive testings compared with constructs employing standard CCP. The more rigid design of the pCCP suggests that this implant may be better at withstanding greater loads, particularly when applied in a bridging fashion, during the postoperative convalescence. Further investigations are warranted to prospectively evaluate the clinical performance of the pCCP.

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Zhong, Benshan, Xixiang Zhou, Xuecai Liu e Yule Jiang. "A new strategy for CCP stacking". GEOPHYSICS 60, n. 2 (marzo 1995): 517–21. http://dx.doi.org/10.1190/1.1443788.

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Raypaths for P-SV‐converted waves are asymmetrical and the reflected events are not hyperbolic. Consequently, standard routines for NMO correction of P‐waves cannot be applied in a straightforward manner. This is a major difficulty in data processing of P-SV‐converted waves. This paper proposes a new strategy for common conversion point (CCP) stacking. The technique accomplishes reflection point migration, nonhyperbolic moveout, and CCP stacking in one step.

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Hottmann, Natasha M., Matthew D. Johnson, Scott A. Banks, David Tuyn e Daniel D. Lewis. "Biomechanical Comparison of Two Locking Plate Constructs for the Stabilization of Feline Tibial Fractures". Veterinary and Comparative Orthopaedics and Traumatology 33, n. 02 (13 dicembre 2019): 089–95. http://dx.doi.org/10.1055/s-0039-3399572.

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Abstract Objectives The aim of this study was to compare the biomechanical characteristics of locking compression plate (LCP) and conical coupling plate (CCP) constructs for the stabilization of experimentally induced gap fractures in cat tibiae. Materials and Methods Pelvic limbs were harvested from eight cat cadavers. Paired tibiae were stripped of all soft tissues, and randomly assigned to the LCP or CCP stabilization group. An eight-hole 2.7 mm LCP or a six-hole 2.5 mm CCP was applied to the medial surface of each tibia. A 1-cm segment of the tibia was excised centrally beneath the plate. The specimens were potted, then tested in non-destructive four-point craniocaudal and mediolateral bending, followed by non-destructive axial compression. Each construct was subsequently loaded to failure in axial compression. Bending and axial stiffness, yield load and failure load were calculated for each specimen. Results The LCP constructs were significantly stiffer than the CCP constructs when subjected to non-destructive bending and axial loading. Craniocaudal bending stiffness was significantly greater than mediolateral bending stiffness for both constructs. Yield load and failure load were significantly greater for LCP constructs compared with CCP constructs. Clinical Significance LCP may be a more suitable implant for stabilizing complex diaphyseal tibial fractures in cats. Additional supplemental fixation should be considered when using CCP to stabilize unreconstructed diaphyseal tibial fractures in cats. Further clinical investigation of both implants is recommended.

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Novruzov, A. G., U. J. Aliyeva e E. A. Alaskarov. "Interpretation of dynamic parameters of local anomalies of refracted waves". SOCAR Proceedings, n. 4 (31 dicembre 2021): 004–7. http://dx.doi.org/10.5510/ogp20210400608.

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The «common contour point» (CCP) technique for finding oil and gas deposits is based on identifying simple local minima on the graphs of the amplitude and energy of seismic waves passing through the reservoir. Simple local minima according to the CCP technique are provided by the identification of crossline profile geophones, the stability of the critical angle of the refracted wave, minor changes in the geometric divergence of seismic waves and the source-receiver distance. Other anomalies caused by local inhomogeneities of the geological environment are overcome based on the correlation of the dynamic parameters of waves recorded from different directions in the crossline profile. The article experimentally demonstrates obtaining simple minima by eliminating the distorting effect of local heterogeneity in the upper part of the section, determining the corresponding characteristic points of minima, as well as the contour and depth of the predicted reservoir. Keywords: oil and gas reservoir; direct search; seismic wave amplitude; local anomaly; «Common contour poin» technique.

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Chun Li e Wilsun Xu. "On defining harmonic contributions at the point of common coupling". IEEE Power Engineering Review 22, n. 7 (luglio 2002): 44–45. http://dx.doi.org/10.1109/mper.2002.1016848.

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Più fonti

Tesi sul tema "COMMON COUPLING POINT (CCP)"

VERMA, PALLAVI. "CONTROL OF SOLAR PV SYSTEM BASED MICROGRID FOR ENHANCED PERFORMANCE". Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18879.

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With the depletion of non-renewable resources and growing public awareness about the advantages of green energy, alternative renewable sources are evolving as a significant source of energy since past few years. Furthermore, the electrical grid is on the verge of a paradigm shift, from centralized power generation, transmission, and huge power grids towards distributed generation (DG). DG fundamentally uses small-scale generators like photovoltaic (PV) panels, wind turbine, fuel cells, small and micro hydropower, diesel generator set, etc., and is limited to small distribution networks to produce power close to the end users. Renewable energy sources (RES) are essential components of DG because they are more environment friendly than conventional power generators and once established maintenance cost is also low. One of the most popular renewable energy source is solar energy because it is abundant, accessible and can be easily converted into electricity. The electricity produced from SPV system can be utilized by the local loads within the microgrid or it can be integrated with conventional grid. Microgrid (MG), which is a cluster of distributed generation, renewable sources, and local loads connected to the utility grid provides solution to manage local generations and loads as a single grid level entity. It has the potential to maximize overall system efficiency, power quality, and energy surety for critical loads. A microgrid can operate either in stand-alone mode or grid connected mode. Due to abundant availability of solar energy, an SPV based microgrid is widely used around the world. Due to intermittent nature of solar energy, stand-alone SPV based microgrid needs an energy storage system also, whereas in grid connected system, the microgrid is connected to conventional grid which takes care of the solar intermittency by having bi-directional flow of power. Depending on the technical specifications, grid-connected solar PV- based microgrid can be single-stage or double-stage. In single stage configuration, PV array is directly connected to a DC/AC converter whereas in double-stage configuration, DC/DC converter is coupled in between the solar PV array and PV inverter and provides the desired fixed DC voltage to the inverter. The present work aims at modelling, design, development and control of a solar PV vii based microgrid for enhanced performance. Also, the characterization studies of the developed system have been carried out. Modeling of the system is required in order to predict its behaviour under both steady and dynamic states. Characterization studies such as sensitivity and reliability analysis are used to evaluate the performance of the system. Sensitivity analysis is the performance evaluation technique for evaluating the change in the system’s performance with respect to the change in its parameters. The sensitivity functions for solar cell and boost converter with respect to influential parameters have been developed using first derivative of Taylor’s series. Reliability analysis for electrical and electronic components of the system have been performed using pareto analysis and reliability model of the PV based microgrid has been developed using reliability block diagram for different PV array configurations. The Fault tree analysis (FTA) model of the system has been developed to find the cause of failure and to step the events leading to failure serially. Further, Markov’s model has been used to develop the reliability functions of individual components and hence, the reliability of complete grid connected PV system has been calculated. Solar PV system gives maximum power under uniform shading. But many a times PV panels are non-uniformly irradiated and this condition is known as called partial shading condition (PSC). PSC occur due to shadow of big trees, nearby buildings and dense clouds etc. PSC in PV system is an inevasible situation and exhibits multiple peaks, consisting of a single global maximum power point and many local maximum power points, in its power-voltage curve. PSC makes tracking of global maximum power point more difficult and also reduces the efficiency of the system. The conventional MPPT control algorithms work well under uniform shading condition but under partial shading scenario, they may not be able to track global peak out of multiple peaks. Therefore, an efficient controller is required to overcome the raised issue. Further, various PV array configurations such as series, series-parallel, total cross tied, bridge linked etc. may be used to improve the system efficiency. In the present work, novel maximum power point control algorithms viz. an asymmetrical fuzzy logic control (AFLC) and asymmetrical interval type-2 FLC (AIT-2 FLC) are developed for stand-alone PV system under partial shading condition. The developed algorithms are tested for different PV array configurations. viii In stand-alone PV system, the power supplied to the load depends upon the available solar energy. The output of SPV is intermittent in nature as it depends on the environmental conditions. This intermittency problem can be addressed by adding an energy storage system along with PV system. Battery is the most commonly used energy storage device and is very pivotal in maintaining continuity of power to the load. But when two or more energy sources are connected, then control of dc link voltage at common coupling point (CCP) is an area of concern. Therefore, in a SPV system with BESS a controller is required which can maintain constant DC link voltage irrespective of system transients. The PI controller is commonly used controller for controlling dc- link voltage, but it cannot regulate DC-link voltage under dynamic operating conditions and have overshoots and long settling time in its response. Suitable intelligent controllers are designed to replace the conventional PI controller, as they provide a better transient response. In order to overcome the drawbacks of the conventional PI control algorithm, nonlinear autoregressive moving average-L2 (NARMA-L2) control algorithm is proposed and developed for the stand-alone PV system with BESS. The proposed control scheme maintains the voltage across DC-link under change in irradiation and load condition. In a grid connected SPV based microgrid, the output of boost converter i.e., DC link is connected to voltage source inverter which is connected to grid at the point of common coupling (PCC). Voltage source inverter converts the generated DC power from PV system to AC of required voltage and frequency, as well as maintains the balance of power between the SPV system, load, and grid. The inverter is regulated by the interfacing controllers for effective operation and grid synchronization. The interfacing controllers are used to control the output of PV inverter for its efficient utilization and for improving power quality at PCC by providing reactive power compensation, harmonics compensation and load balancing. Conventional control algorithm like synchronous reference frame theory (SRFT) uses proportional integral (PI) controller for DC-link voltage regulation. These controllers are not best suited for SPV based microgrid as the overshoots and long settling time in their response are inevitable. In order to overcome this, novel smooth Least Mean Square (SLMS), improved zero attracting LMS (IZALMS) and reweighted L0 norm variable step size continuous mixed p-norm (RL0-VSSCMPN) based adaptive interfacing control algorithms are proposed ix and developed for the PV based microgrid. The efficacy of the proposed control algorithms has been tested on hardware prototype developed in the laboratory using MicroLab box (dSPACE 1202). The developed prototype system acts as distribution static compensator (DSTATCOM) and consists of inverter that is tied in parallel to the grid at the point of common coupling. FLUKE power analyzer has been used to measure the response of the system. The research work presented in the thesis is expected to provide good exposure to design, development and control of the solar PV based microgrid.

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Altintas, Erinc. "Flicker Source Identification At A Point Of Common Coupling Of The Power System". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611919/index.pdf.

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Voltage fluctuations under 30 Hz in the electricity grid, leads to oscillations in the light intensity that can be perceived by human eye, which is called flicker. In this thesis, the sources of the flicker at a point of common coupling is investigated. When there are more than one flicker sources connected to a PCC, individual effects of each flicker source is determined by using a new method which depends on the reactive current components of the sources. This method is mainly based on the flickermeter design defined by the International Electrotechnical Commission (IEC), but uses the current variations in addition to the voltage variations to compute flicker. The proposed method is applied to several different types of loads supplied from a PCC and their flicker contributions on the busbar are investigated. Experiments are performed on field data obtained by the power quality analyzers (PQ+) developed by the National Power Quality Project and the method has been found to provide accurate results for flicker contributions of various loads. The PQ+ analyzers with the proposed flicker contribution detection algorithm are called Flicker Contribution Meters (FCM) and they will be installed at the points of the Turkish Electricity Transmission Network when required.

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Al, Hosani Mohamed. "Transient and Distributed Algorithms to Improve Islanding Detection Capability of Inverter Based Distributed Generation". Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6235.

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Recently, a lot of research work has been dedicated toward enhancing performance, reliability and integrity of distributed energy resources that are integrated into distribution networks. The problem of islanding detection and islanding prevention (i.e. anti-islanding) has stimulated a lot of research due to its role in severely compromising the safety of working personnel and resulting in equipment damages. Various Islanding Detection Methods (IDMs) have been developed within the last ten years in anticipation of the tremendous increase in the penetration of Distributed Generation (DG) in distribution system. This work proposes new IDMs that rely on transient and distributed behaviors to improve integrity and performance of DGs while maintaining multi-DG islanding detection capability. In this thesis, the following questions have been addressed: How to utilize the transient behavior arising from an islanding condition to improve detectability and robust performance of IDMs in a distributive manner? How to reduce the negative stability impact of the well-known Sandia Frequency Shift (SFS) IDM while maintaining its islanding detection capability? How to incorporate the perturbations provided by each of DGs in such a way that the negative interference of different IDMs is minimized without the need of any type of communication among the different DGs? It is shown that the proposed techniques are local, scalable and robust against different loading conditions and topology changes. Also, the proposed techniques can successfully distinguish an islanding condition from other disturbances that may occur in power system networks. This work improves the efficiency, reliability and safety of integrated DGs, which presents a necessary advance toward making electric power grids a smart grid.
Ph.D.
Doctorate
Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering

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Shan, S. "Unified Control based Adaptable Converters with a Fractional Harmonic Inter Converter Signalling channel for Dynamic tracking of PCC and Managing Multiple Converters Connected in Parallel in a Microgid". Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4639.

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The increasing demand of energy over the past few years as well as the growing environmental concerns have forced the mankind to look out for non conventional sources of energy such as solar, wind etc. Consequently a large number of these energy resources are integrated to the existing power grid in a distributive manner. These resources known as distributed energy resources (DERs) are interfaced to the grid through power electronic converters. More and more DERs are being integrated to the grid. The increased penetration of DERs interfaced through power electronic converters have led to the concept of microgrids. The installation of microgrids have become a common scenario across the globe. However, the microgrid is also not devoid of technical issues like any other system. In this thesis, the author looks at some of the persistent issues in the microgrid and proposes some relevant practical solutions. The thesis is broadly divided into four parts. The first part deals with the concept of a Utility Interactive Uninterruptible Power Converter (UIUPC) and its role in a microgrid. In the first part, a new UIUPC, making use of a concept known as unified control is proposed. The proposed unified control is based on controlling the perturbations in the magnitude and speed of the point of common coupling (PCC) space vector with respect to a reference space vector applied continuously along the direction of the PCC space vector. The proposed unified control based UIUPC inherently transfers from a grid follower to a grid former and vice -versa according to the modes without the help of any islanding detection algorithms or external synchronising mechanisms. The second part of the thesis looks at the issue of communication between power converters connected in a microgrid. The thesis proposes a novel method of inter converter communication through the existing power line. The proposed method is based on the concept of using a fractional harmonic space vector to carry the data. The data is modulated and demodulated in the corresponding fractional harmonic d-q domains. The use of fractional harmonic d-q domains make the data appear as bits like a conventional communication system. The proposed method thus puts forth an inter converter communication technique which is economical and at the same time carries forward the advantages of a traditional communication system. The third part of thesis proposes a control architecture for managing a number of power converters connected in parallel in a microgrid. The proposal divides the microgrids into smaller units called cells. Each cell is made up of unified control based UIUPCs called as adaptable converters and current controlled converters. The adaptable converters ensure a smooth transition of the cell from a grid connected mode to an autonomous mode and vice versa without any interruption or breakage. The issue of energy imbalance persistent in a microgrid is also taken care of by using the inter inverter communication technique proposed. The proposed control architecture also takes care of the feature of redundancy of adaptable converters. This assures that the system remains functional in the event of a failure of the determining adaptable converters. The final part of the thesis is about the hardware implementation of the whole thesis. As a contribution towards the thesis, in this part the author introduces a new generation power converter which can be used in future. This part of the thesis also puts forward a novel integrated gate driver card. The proposed gate driver is based on interleaving of two forward converters. The proposed gate driver achieves the objectives of magnetic isolation and a wide duty cycle band along with the other necessary requirements of a gate driver card.

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Alizadeh, Seyed Morteza. "An analytical voltage stability model for wind power plant sizing and siting in distribution networks". Thesis, 2017. https://vuir.vu.edu.au/35053/.

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Electrical energy is the most widely used form of energy worldwide. The world is currently experiencing severe energy shortages as the fossil-fuel deposits are decreasing at an alarming rate. The increased awareness about environmental hazards, caused by the burning of fuels, is also forcing governments towards exploiting renewable-energy resources. Wind is one the important renewable resources, abundantly available, and offers the lowest cost per MWh as compared to most other renewable-energy resources. Harvesting energy from the wind as an alternative to fossil fuels has many advantages in terms of protecting the environment and promoting sustainability. However, voltage profile of distribution networks with interconnected Wind Power Plant (WPP) can be significantly affected ascribable to the limited capability of Wind Turbine Generators (WTGs) in regulating terminal voltage through reactive power control.

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Zhang, Heng. "High Performance RF and Basdband Analog-to-Digital Interface for Multi-standard/Wideband Applications". Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8609.

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The prevalence of wireless standards and the introduction of dynamic standards/applications, such as software-defined radio, necessitate the next generation wireless devices that integrate multiple standards in a single chip-set to support a variety of services. To reduce the cost and area of such multi-standard handheld devices, reconfigurability is desirable, and the hardware should be shared/reused as much as possible. This research proposes several novel circuit topologies that can meet various specifications with minimum cost, which are suited for multi-standard applications. This doctoral study has two separate contributions: 1. The low noise amplifier (LNA) for the RF front-end; and 2. The analog-to-digital converter (ADC). The first part of this dissertation focuses on LNA noise reduction and linearization techniques where two novel LNAs are designed, taped out, and measured. The first LNA, implemented in TSMC (Taiwan Semiconductor Manufacturing Company) 0.35Cm CMOS (Complementary metal-oxide-semiconductor) process, strategically combined an inductor connected at the gate of the cascode transistor and the capacitive cross-coupling to reduce the noise and nonlinearity contributions of the cascode transistors. The proposed technique reduces LNA NF by 0.35 dB at 2.2 GHz and increases its IIP3 and voltage gain by 2.35 dBm and 2dB respectively, without a compromise on power consumption. The second LNA, implemented in UMC (United Microelectronics Corporation) 0.13Cm CMOS process, features a practical linearization technique for high-frequency wideband applications using an active nonlinear resistor, which obtains a robust linearity improvement over process and temperature variations. The proposed linearization method is experimentally demonstrated to improve the IIP3 by 3.5 to 9 dB over a 2.5–10 GHz frequency range. A comparison of measurement results with the prior published state-of-art Ultra-Wideband (UWB) LNAs shows that the proposed linearized UWB LNA achieves excellent linearity with much less power than previously published works. The second part of this dissertation developed a reconfigurable ADC for multistandard receiver and video processors. Typical ADCs are power optimized for only one operating speed, while a reconfigurable ADC can scale its power at different speeds, enabling minimal power consumption over a broad range of sampling rates. A novel ADC architecture is proposed for programming the sampling rate with constant biasing current and single clock. The ADC was designed and fabricated using UMC 90nm CMOS process and featured good power scalability and simplified system design. The programmable speed range covers all the video formats and most of the wireless communication standards, while achieving comparable Figure-of-Merit with customized ADCs at each performance node. Since bias current is kept constant, the reconfigurable ADC is more robust and reliable than the previous published works.

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Capitoli di libri sul tema "COMMON COUPLING POINT (CCP)"

Fu, Jun, Xiaochen Wang, Zhaohui Shi, Fan Zhang, Xinning Li e Chunjuan Jia. "A Compensation Method of Point of Common Coupling Voltage for Microgrid Based on Voltage Estimation". In Lecture Notes in Electrical Engineering, 634–44. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1532-1_67.

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Blokland, Peter J., e Genserik L. Reniers. "The Concepts of Risk, Safety, and Security: A Fundamental Exploration and Understanding of Similarities and Differences". In The Coupling of Safety and Security, 9–16. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47229-0_2.

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Abstract When discussing the concepts of risk, safety, and security, people have an intuitive understanding of what these concepts mean and to a certain level, this understanding is universal. However, when delving into the meaning of the words and concepts in order to fully understand all their aspects, one is likely to fall into a semantic debate and ontological discussions. As such, this chapter explores the similarities and differences behind the perceptions to come to a fundamental understanding of the concepts, proposing a common semantic and ontological ground for safety and security science, introducing a definition of objectives as a central starting point in the study and management of risk, safety, and security.

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Saviuc, Iolanda, Steven Van Passel e Herbert Peremans. "Integrating PV+Battery Residential Microgrids in Distribution Networks: How Is the Point of Common Coupling Agreed Upon?" In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 150–64. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45694-8_12.

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Abu-Siada, Ahmed, Mohammad A. S. Masoum, Yasser Alharbi, Farhad Shahnia e A. M. Shiddiq Yunus. "Applications of Unified Power Flow Controller in Wind Energy Conversion System". In Recent Advances in Renewable Energy, 17–48. UAE: Bentham Science Publishers Ltd., 2017. http://dx.doi.org/10.2174/9781681085425117020003.

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Unified power flow controller (UPFC) is one of the Flexible ac Transmission System (FACTS) devices that possess the ability of modulating both active and reactive power at the point of common coupling in four quadrant operational modes. This chapter illustrates UPFC topology, controllers with some case studies for various applications of UPFC in the DFIG-based WECS. New applications for UPFC are proposed to improve the overall performance of a DFIG-based WECS during voltage sag and voltage swell events at the grid side.

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Frisk Kockum, Anton. "Quantum Optics with Giant Atoms—the First Five Years". In International Symposium on Mathematics, Quantum Theory, and Cryptography, 125–46. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5191-8_12.

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Abstract In quantum optics, it is common to assume that atoms can be approximated as point-like compared to the wavelength of the light they interact with. However, recent advances in experiments with artificial atoms built from superconducting circuits have shown that this assumption can be violated. Instead, these artificial atoms can couple to an electromagnetic field at multiple points, which are spaced wavelength distances apart. In this chapter, we present a survey of such systems, which we call giant atoms. The main novelty of giant atoms is that the multiple coupling points give rise to interference effects that are not present in quantum optics with ordinary, small atoms. We discuss both theoretical and experimental results for single and multiple giant atoms, and show how the interference effects can be used for interesting applications. We also give an outlook for this emerging field of quantum optics.

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Abu-Siada, Ahmed. "Preface". In Recent Advances in Renewable Energy, i. UAE: Bentham Science Publishers Ltd., 2017. http://dx.doi.org/10.2174/9781681085425117020001.

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Due to the continuous resources’ reduction and cost increase of conventional fossil fuel along with the global trend to decrease the greenhouse effect, clean energy production from renewable sources has been given a global great concern. Among renewable energy sources, wind energy conversion systems have received a worldwide notable attention. It is expected that more than 10% of the global electricity demand will to be generated by wind energy conversion systems by the year 2020. During their early implementation stage, wind turbines were to be disconnected during abnormal and fault conditions within the electricity grid it is connected to. Owing to the fact that current wind installations supply a significant portion of the load demand, disconnecting windfarms may lead to business interruption and discontinuity of power supply to the end user. As such, transmission line operators have developed strict grid codes that wind turbine generator must meet to maintain its connection to support the grid during various fault conditions. To comply with these codes, flexible AC transmission systems have been widely used with current wind energy conversion systems to modulate reactive and/or active power at the point of common coupling of the wind turbine generator and the grid. This book presents the applications of various flexible ac transmission system devices to wind energy conversion systems. Devices such as unified power flow controllers, superconducting magnetic energy storage and static synchronous compensator are covered in this book. Topologies, control systems along with case studies of the aforementioned devices are presented and discussed. This book will be useful for postgraduate research students, upper-division electrical engineering students and practicing engineers.

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Xu, Xiaoqun. "“Contradictions between the People and the Enemy”". In Heaven Has Eyes, 175–206. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190060046.003.0008.

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Chapter 7 presents the Maoist theory of class struggle and its manifestation in dealing with common crimes and political offenses by legal (and extralegal) and judicial (and extrajudicial) means. Such practices originated in the pre-1949 revolutionary experiences and culminated in the disastrous Cultural Revolution (1966–1976). The chapter explains the reasons why the CCP did not find it necessary to have a criminal code and a criminal procedural law, and how the mechanisms of social engineering that the CCP designed and developed helped social control and crime prevention. It traces the rationales and practices of “reform through labor” and “reeducation through labor” during the Mao era and after. It describes the political campaigns of the 1950s and 1960s that reached the point of lawlessness in the Cultural Revolution.

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Ramljak, Ivan, e Drago Bago. "Impact of PV Plant on Voltage Variations in Point of Common Coupling". In DAAAM Proceedings, 0842–50. DAAAM International Vienna, 2020. http://dx.doi.org/10.2507/31st.daaam.proceedings.118.

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Kumar Behara, Ramesh, e Kavita Behara. "Simulation Analysis of DFIG Integrated Wind Turbine Control System". In Wind Turbines - Advances and Challenges in Design, Manufacture and Operation [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.103721.

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Recently, scientists and academics are discovering progressive improvements in the arena of wind power technology economically and reliably, allowing them to produce electricity focusing on renewable energy resources. Wind turbines (WT) using the Doubly Fed Induction Generators (DFIGs) have attracted particular attention because of their advantages such as variable speed constant frequency (VSCF) operation, independent control capabilities for maximum power point tracking (MPPT), active and reactive power controls, and voltage control strategy at the point of common coupling (PCC). When such resources have to be integrated into the existing power system, the operation becomes more challenging, particularly in terms of stability, security, and reliability. A DFIG system with its control strategies is simulated on MATLAB software. This entails the rapid control prototype testing of grid-connected, variable speed DFIG wind turbines to investigate the WT’s steady-state and dynamic behavior under normal and disturbed wind conditions. To augment the transient stability of DFIG, the simulation results for the active and reactive power of conventional controllers are compared with the adaptive tracking, self-tuned feed-forward PI controller model for optimum performance. Conclusive outcomes manifest the superior robustness of the feed-forward PI controller in terms of rising time, settling time, and overshoot value.

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Pang, Simin, Ruiyuan Jia, Qihui Liu, Linlin Wu e Hui Liu. "Base-Frequency Negative Sequence Impedance Modeling and Sensitivity Analysis of DFIG". In Advances in Transdisciplinary Engineering. IOS Press, 2021. http://dx.doi.org/10.3233/atde210257.

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The phenomenon of three phase voltage imbalance frequently occurs in large-scale new energy grid connected areas in China; in severe cases, a large number of wind turbines will be disconnected from the grid. To solve the problem of the voltage imbalance at the point of common coupling (PCC), analyze the influence of generator parameters change on negative sequence voltage under the background of unbalanced power grid, a modeling method of base-frequency negative sequence impedance of doubly fed induction generator (DFIG) which including phase locked loop (PLL), rotor side converter (RSC) and grid side converter (GSC) is proposed. By establishing the negative sequence equivalent circuit of grid-connected system of DFIG, the relationship between the negative sequence voltage of PCC and the negative sequence impedance of DFIG is listed, and analyzing the sensitivity of control parameters link to base-frequency impedance, the parameter that has great influence on base-frequency negative sequence impedance of PCC is found out. Finally, the accuracy of impedance modeling and sensitivity analysis is verified by simulation studies.

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Atti di convegni sul tema "COMMON COUPLING POINT (CCP)"

Hansen, Dennis. "IEEE 519 misapplications— Point of common coupling issues". In Energy Society General Meeting. IEEE, 2008. http://dx.doi.org/10.1109/pes.2008.4596868.

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Caruso, M., A. O. Di Tommaso, R. Miceli, C. Nevoloso, F. Pellitteri, C. Puccio e G. Schettino. "Experimental Prototyping of a Microgrid with Mechanical Point of Common Coupling". In 2020 8th International Conference on Smart Grid (icSmartGrid). IEEE, 2020. http://dx.doi.org/10.1109/icsmartgrid49881.2020.9144960.

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Minambres-Marcos, V., M. A. Guerrero-Martinez, E. Romero-Cadaval e Pedro Gonzalez-Castrillo. "Point of common coupling voltage regulation with photovoltaic power plant infrastructures". In 2014 IEEE 23rd International Symposium on Industrial Electronics (ISIE). IEEE, 2014. http://dx.doi.org/10.1109/isie.2014.6864933.

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Dragosavac, Jasna, Zarko Janda, Jelena Pavloviu e Zoran Ciriu. "Reactive Power Dispatching Among Generating Units Connected to Point of Common Coupling". In 2019 IEEE Milan PowerTech. IEEE, 2019. http://dx.doi.org/10.1109/ptc.2019.8810529.

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Arani, Mohammadreza F. M., Amir Abiri Jahromi, Deepa Kundur e Marthe Kassouf. "Modeling and Simulation of the Aurora Attack on Microgrid Point of Common Coupling". In 2019 7th Workshop on Modeling and Simulation of Cyber-Physical Energy Systems (MSCPES). IEEE, 2019. http://dx.doi.org/10.1109/mscpes.2019.8738801.

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Rowe, Christopher N., Terrence J. Summers, Robert E. Betz e Timothy G. Moore. "A virtual Point of Common Coupling voltage for improved droop control in microgrids". In 2012 EPE-ECCE Europe Congress. IEEE, 2012. http://dx.doi.org/10.1109/epepemc.2012.6397453.

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Aklo, Nabil Jalil, e Mofeed Turky Rashid. "Reinforcement Learning Based Energy Storage Units Scheduling Considering Point of Common Coupling Constraint". In 2021 3rd International Symposium on Material and Electrical Engineering Conference (ISMEE). IEEE, 2021. http://dx.doi.org/10.1109/ismee54273.2021.9774197.

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Yazdkhasti, Pegah, e Chris P. Diduch. "An islanding detection method based on measuring impedance at the point of common coupling". In 2015 IEEE 28th Canadian Conference on Electrical and Computer Engineering (CCECE). IEEE, 2015. http://dx.doi.org/10.1109/ccece.2015.7129160.

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Payam, A. Farrokh, B. Mirzaeian Dehkordi, M. S. Sadri e M. Moallem. "An Energy Method for Determination of Flicker Source at the Point of Common Coupling". In EUROCON 2007 - The International Conference on "Computer as a Tool". IEEE, 2007. http://dx.doi.org/10.1109/eurcon.2007.4400457.

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Nagaraj C e K. Manjunatha Sharma. "Harmonic current compensation improvement at point of common coupling using hybrid natural green sources". In 2017 Third International Conference on Advances in Electrical, Electronics, Information, Communication and Bio-Informatics (AEEICB). IEEE, 2017. http://dx.doi.org/10.1109/aeeicb.2017.7972342.

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