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Journal articles on the topic 'Unified controller'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

B.Gopinath, B. Gopinath, Anit Mariya Tom Anit Mariya Tom, and Dr S. Suresh Kumar. "Enhancing Power System Reliability Using Unified Power Flow Controller." Indian Journal of Applied Research 3, no. 11 (October 1, 2011): 160–63. http://dx.doi.org/10.15373/2249555x/nov2013/55.

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2

Mwinyiwiwa, B., Bin Lu, and Boon-Teck Ooi. "Multiterminal unified power flow controller." IEEE Transactions on Power Electronics 15, no. 6 (November 2000): 1088–93. http://dx.doi.org/10.1109/63.892823.

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3

Alsammak, Ahmed Nasser, and Hasan Adnan Mohammed. "Power quality improvement using fuzzy logic controller based unified power flow controller." Indonesian Journal of Electrical Engineering and Computer Science 21, no. 1 (January 1, 2021): 1. http://dx.doi.org/10.11591/ijeecs.v21.i1.pp1-9.

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<p>The Power quality of the electrical system is an important issue for industrial, commercial, and housing uses. An increasing request for high quality electrical power and an increasing number of distorting loads had led to increase the consideration of power quality by customers and utilities. The development and use of flexible alternating current transmission system (FACTs) controllers in power transmission systems had led to many applications of these controllers. A unified power flow controller (UPFC) is one of the FACTs elements which is used to control both active and reactive power flow of the transmission line. This paper tried to improve power quality using a fuzzy logic controller (FLC) based UPFC, where it used to control both active and reactive power flow, decreas the total harmonic distortion (THD), correct power factor, regulate line voltage and enhance transient stability. A comparison study of the performance between the system with a conventional PID controller and FLC has been done. The theoretical analysis has been proved by implementing the system using MATLAB/SIMULINK package.The Power quality of the electrical system is an important issue for industrial, commercial, and housing uses. An increasing request for high quality electrical power and an increasing number of distorting loads had led to increase the consideration of power quality by customers and utilities. The development and use of flexible alternating current transmission system (FACTs) controllers in power transmission systems had led to many applications of these controllers. A unified power flow controller (UPFC) is one of the FACTs elements which is used to control both active and reactive power flow of the transmission line. This paper tried to improve power quality using a fuzzy logic controller (FLC) based UPFC, where it used to control both active and reactive power flow, decreas the total harmonic distortion (THD), correct power factor, regulate line voltage and enhance transient stability. A comparison study of the performance between the system with a conventional PID controller and FLC has been done. The theoretical analysis has been proved by implementing the system using MATLAB/SIMULINK package.</p>

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4

Renz, B. A., A. Keri, A. S. Mehraban, C. Schauder, E. Stacey, L. Kovalsky, L. Gyugyi, and A. Edris. "AEP unified power flow controller performance." IEEE Transactions on Power Delivery 14, no. 4 (1999): 1374–81. http://dx.doi.org/10.1109/61.796231.

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5

Aredes, M., and K. Heumann. "An advanced unified power flow controller." Electrical Engineering 79, no. 4 (August 1996): 303–10. http://dx.doi.org/10.1007/bf01245883.

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6

Gravagne, Ian A., John M. Davis, and Jeffrey J. DaCunha. "A Unified Approach to High-Gain Adaptive Controllers." Abstract and Applied Analysis 2009 (2009): 1–13. http://dx.doi.org/10.1155/2009/198353.

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It has been known for some time that proportional output feedback will stabilize MIMO, minimum-phase, linear time-invariant systems if the feedback gain is sufficiently large. High-gain adaptive controllers achieve stability by automatically driving up the feedback gain monotonically. More recently, it was demonstrated that sample-and-hold implementations of the high-gain adaptive controller also require adaptation of the sampling rate. In this paper, we use recent advances in the mathematical field of dynamic equations on time scales to unify and generalize the discrete and continuous versions of the high-gain adaptive controller. We prove the stability of high-gain adaptive controllers on a wide class of time scales.

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7

Cheok, K. C., N. K. Loh, and M. A. Zohdy. "Generalized Optimal Feedback Controllers for Discrete-Time Linear Systems." Journal of Dynamic Systems, Measurement, and Control 108, no. 2 (June 1, 1986): 91–95. http://dx.doi.org/10.1115/1.3143762.

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This paper presents a unified treatment to the problem of optimal feedback control of discrete-time linear shift-invariant systems using state feedback, output feedback, dynamical output feedback, and observer-controller feedback. A class of generalized optimal feedback controllers is proposed as a basis for obtaining existing results as well as for deriving new results such as the interesting min-max feedback controllers. The essence of the generalized results lies in the minimization of a class of generalized performance measures subject to a flexible controller configuration. The stability aspect of the generalized optimal feedback controlled system is addressed.

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8

Abdalla, Musa, and Tamir Shagarin. "Industrial Process Control Using LPV." Modern Applied Science 11, no. 9 (August 11, 2017): 39. http://dx.doi.org/10.5539/mas.v11n9p39.

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An industrial process control application of level and temperature is considered. The nonlinear mathematical model of the system is cast as a linear parameter varying (LPV) system. A linear matrix inequality (LMI) type of controller is successfully designed using the LMI unified approach to regulating both controlled variables, namely; temperature and level. The closed loop system is then implemented through computer simulation to show the effectiveness of the controller in performing the combined level-temperature regulation. Basically, this combined level and temperature industrial control application is used to demonstrate the effectiveness of post-modern controllers; in this case LMI based controllers.

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9

Kohno, Hirotoshi, Tatsuhito Nakajima, and Akihiko Yokoyama. "Power System Damping Enhancement using Unified Power Flow Controller (UPFC)." IEEJ Transactions on Power and Energy 119, no. 3 (1999): 344–53. http://dx.doi.org/10.1541/ieejpes1990.119.3_344.

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10

Duran, Alberto, Efrain Ibaceta, Matias Diaz, Felix Rojas, Roberto Cardenas, and Hector Chavez. "Control of a Modular Multilevel Matrix Converter for Unified Power Flow Controller Applications." Energies 13, no. 4 (February 20, 2020): 953. http://dx.doi.org/10.3390/en13040953.

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The modular multilevel matrix converter has been proposed as a suitable option for high power applications such as flexible AC transmission systems. Among flexible AC transmission systems, the unified power flow controller stands out as the most versatile device. However, the application of the modular multilevel matrix converter has not been thoroughly analyzed for unified power flow controller applications due to the sophisticated control systems that are needed when its ports operate at equal frequencies. In this context, this paper presents a cascaded control structure for a modular multilevel matrix converter based unified power flow controller. The control is implemented in a decoupled reference frame, and it features proportional-integral external controllers and internal proportional multi-resonant controllers. Additionally, the input port of the modular multilevel matrix converter is regulated in grid-feeding mode, and the output port is regulated in grid-forming mode to provide power flow compensation. The effectiveness of the proposed vector control system is demonstrated through simulation studies and experimental validation tests conducted with a 27-cell 5 kW prototype.

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11

CHIDA, Takuji, Yoshihiko SATO, Jun SUGAWARA, Ryuuichi MORIKAWA, Yoshiaki TAMURA, and Shoichi IROKAWA. "Simulation Study of Unified Power Flow Controller." IEEJ Transactions on Power and Energy 117, no. 7 (1997): 960–66. http://dx.doi.org/10.1541/ieejpes1990.117.7_960.

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12

Chida, Takuji, Yoshihiko Sato, Jun Sugawara, Ryuuichi Morikawa, Yoshiaki Tamura, and Shoichi Irokawa. "Simulation study of unified power flow controller." Electrical Engineering in Japan 127, no. 1 (April 15, 1999): 23–30. http://dx.doi.org/10.1002/(sici)1520-6416(19990415)127:1<23::aid-eej3>3.0.co;2-u.

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13

Makombe, T., and N. Jenkins. "Investigation of a unified power flow controller." IEE Proceedings - Generation, Transmission and Distribution 146, no. 4 (1999): 400. http://dx.doi.org/10.1049/ip-gtd:19990037.

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14

Wang, H. F. "Damping function of unified power flow controller." IEE Proceedings - Generation, Transmission and Distribution 146, no. 1 (1999): 81. http://dx.doi.org/10.1049/ip-gtd:19990064.

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15

Papic, I., P. Zunko, D. Povh, and M. Weinhold. "Basic control of unified power flow controller." IEEE Transactions on Power Systems 12, no. 4 (1997): 1734–39. http://dx.doi.org/10.1109/59.627884.

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16

El-Emari, H. I. "Application of proportional–integral–derivative controller for Unified power flow controller." Annals of Electrical and Electronic Engineering 2, no. 9 (September 2019): 1–5. http://dx.doi.org/10.21833/aeee.2019.09.001.

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17

R., Sreerama Kumar, Ibrahim M. Jomoah, and Abdullah Omar Bafail. "Optimal Placement of Unified Power Flow Controller for Minimization of Power Transmission Line Losses." International Journal of Computer Theory and Engineering 6, no. 5 (October 2014): 377–81. http://dx.doi.org/10.7763/ijcte.2014.v6.893.

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18

H., Ananda M., and M. R. Shivakumar. "Particle swarm optimization tuned unified power flow controller for power oscillation reduction." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 2 (August 1, 2021): 633. http://dx.doi.org/10.11591/ijeecs.v23.i2.pp633-638.

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One of the best flexible AC transmission system (FACTS) is unified power flow controller (UPFC). As it gets more benefit from both real and reactive power transfer, it is used in power system for controlling the transmitted power. The UPFC controls the power on the transmission side of the power system. When the real as well as reactive power is set the UPFC tries to follow the command by using the proportional and integral (PI) controller. But in some power systems the PI controllers cannot produce the proper power due to the power oscillations. These oscillations are created due to PI controller properties. In this paper the PI controller is replaced with the particle swarm optimization tuned PI controller (PSO-PI). It minimizes the power oscillations by using the objective function. The MATLAB 2017b is used to demonstrate the power transfer curves and the voltages. The IEEE 9 bus system is being used as a reference system.

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19

Pasha, SK Abdul, and N. Prema Kumar. "Model Predictive Controller based Unified Power Quality Conditioner for Voltage Regulation Studies in 33- Bus Closed Loop Distribution System." E3S Web of Conferences 184 (2020): 01073. http://dx.doi.org/10.1051/e3sconf/202018401073.

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Recent developments in FACTS have produced U.P.Q.C to mitigate sag and attenuate THD. U.P.Q.C has been urbanized as a FACTS controller between feeding end & far end of distribution system .The U-P-Q-C is capable of improving the voltage profile & reducing THD of distribution system by regulating the voltage using PR (Proportional-Resonant-Controller) and MPC (Model-Predictive) controller. This work proposes U-P-Q-C for Thirty Three Bus Systems .The objective of this work is to enhance-voltage-profile of T-T-B-S. The T-T-B-S in open loop & closed loop-TTBS- U-P-Q-C using PR and MPC-controllers are-modeled,pretend & their consequences are represented. Responses are estimated as a time of settle and error in steady state. The outcomes indicate that MP Controlled T-T-B-S system has better response than PR controlled T-T-B-S system.

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20

Noghredani, Naeimadeen, and Saeed Balochian. "Robust Synchronisation of Uncertain Fractional-Order Chaotic Unified Systems." Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences. 71, no. 1-2 (April 25, 2017): 69–77. http://dx.doi.org/10.1515/prolas-2017-0012.

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Abstract Fractional-order chaotic unified systems include a variety of fractional-order chaotic systems such as Chen, Lorenz, Lu, Liu, and financial systems. This paper describes a sliding mode controller for synchronisation of fractional-order chaotic unified systems in the presence of uncertainties and external disturbances, and affirms the stability of the controller (which is composed of error dynamics). Moreover, the synchronisation of two separate fractional-order chaotic systems is studied. For this aim, fractional integral sliding surface is defined. Then the sliding mode control rule for stability of error dynamic is presented based on the Lyapunov stability theorem. Simulation results, obtained by using MATLAB, show that the proposed sliding mode has employed an appropriate approach against uncertainties and to reduce the chattering phenomenon that often occurs with sliding mode controllers.

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21

Hou, Yi-You, Ben-Yi Liau, and Hsin-Chieh Chen. "Synchronization of Unified Chaotic Systems Using Sliding Mode Controller." Mathematical Problems in Engineering 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/632712.

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This paper presents a method for synchronizing the unified chaotic systems via a sliding mode controller (SMC). The unified chaotic system and problem formulation are described. Two identical unified chaotic systems can be synchronized using the SMC technique. The switching surface and its controller design are developed in detail. Simulation results show the feasibility of a chaotic secure communication system based on the synchronization of the Lorenz circuits via the proposed SMC.

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22

Matsuki, Junya, Yasuhiro Hayashi, Shunsuke Kitajima, Masahiro Takahashi, and Kenji Murata. "Experimental Study on the Unified Power Flow Controller." IEEJ Transactions on Power and Energy 126, no. 6 (2006): 605–10. http://dx.doi.org/10.1541/ieejpes.126.605.

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23

Khan, M. Y. A., U. Khalil, H. Khan, A. Uddin, and S. Ahmed. "Power Flow Control by Unified Power Flow Controller." Engineering, Technology & Applied Science Research 9, no. 2 (April 10, 2019): 3900–3904. http://dx.doi.org/10.48084/etasr.2587.

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The demand for electricity is increasing day by day and we have to produce more electrical energy to meet the load demands. Most of the experts prefer to extend the existing electrical networks over building the new network with greater costs. In this paper, the implementation of the flexible AC transmission systems (FACTS) devices in a simple electrical network is described. FACTS devices enhance power transfer capacity of the line without laying out new transmission line. These devices also protect the system from overloading in case of any contingency in the electrical network. Moreover, this paper describes the impacts of FACTS devices on improving the voltage stability and power handling capability of a transmission line. The proposed methods for the controllable flow of active and reactive power in a transmission line are also elaborated. A simple electrical system is examined to explain the improvement in the constraints of power system using FACTS devices.

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24

Khalil, Umair, Muhammad Yousaf Ali Khan, Umer Amir Khan, and Shahid Atiq. "Power Flow Control by Unified Power Flow Controller." April 2020 39, no. 2 (April 1, 2020): 257–66. http://dx.doi.org/10.22581/muet1982.2002.04.

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The demand of energy usage is increasing rapidly and to meet the energy requirements, best possible transmission systems should be adopted to avoid energy losses in our transmission systems. In Pakistan’s WAPDA (Water & Power Development Authority) system, the rapid increase in load and less generation capacity has increased load shedding thought the country. The government has planned to increase the generation capacity but the supply companies are facing line load-ability, environmental constraints, power limitations problems etc. Most of the supply companies prefer to extend the existing electrical networks instead of building new network to reduce financial burdens. In this paper the implementation of the FACTS (Flexible AC Transmission Systems) Devices in an electrical network is described. The FACTS devices enhance power transfer capacity of the line without adding new transmission line. These devices also protect the system from overloading in case of any contingency in the electrical network. The control of power flow, reactive power compensation and voltage control are the main capabilities of FACTS devices. This paper describes the impacts of FACTS devices on improving the voltage stability and power handling capability of a transmission line. The proposed methods for the controllable flow of active and reactive power in a transmission line are also elaborated. A simple electrical system is examined to explain the improvement in the constraints of power system using FACTS devices.

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25

Lee, Hyun-Jun, Dae-Shik Lee, and Young-Doo Yoon. "Unified Power Flow Controller Based on Autotransformer Structure." Electronics 8, no. 12 (December 13, 2019): 1542. http://dx.doi.org/10.3390/electronics8121542.

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This paper proposes a new unified power flow controller (UPFC) topology. A single phase of them system with the proposed topology consists of an N:2 transformer with a center tap at the low-voltage side and a power converter module comprising full- and half-bridge converters. A three-phase system can be implemented with three devices. While the conventional UPFC topology uses two three-phase transformers, which are called series and parallel transformers, the proposed topology utilizes three single-phase transformers to implement a three-phase UPFC system. By using an autotransformer structure, the power rating of the transformers and the voltage rating of switches in the power converter module can be significantly decreased. As a result, it is possible to reduce the installation spaces and costs compared with the conventional UPFC topology. In addition, by adopting a full- and half-bridge converter structure, the proposed topology can be easily implemented with conventional power devices and control techniques. The techniques used to control the proposed topology are described in this paper. The results obtained from simulations and experiments verify the effectiveness of the proposed UPFC topology.

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26

Loc, Ho Dac. "Unified Power Flow Controller: Modeling And Dynamic Characteristic." IOSR Journal of Engineering 4, no. 9 (September 2014): 52–60. http://dx.doi.org/10.9790/3021-04945260.

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27

Soeterboek, A. R. M., H. B. Verbruggen, and P. P. J. van den Bosch. "On the Design of the Unified Predictive Controller." IFAC Proceedings Volumes 24, no. 1 (January 1991): 351–56. http://dx.doi.org/10.1016/s1474-6670(17)51344-0.

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28

Bensalem, Ahmed, Khoukha Berrahal, and Abd El Malik Bouhentala. "Three level inverter-based unified power flow controller." International Journal of Power Electronics 11, no. 2 (2020): 195. http://dx.doi.org/10.1504/ijpelec.2020.10026822.

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29

Berrahal, Khoukha, Abd El Malik Bouhentala, and Ahmed Bensalem. "Three level inverter-based unified power flow controller." International Journal of Power Electronics 11, no. 2 (2020): 195. http://dx.doi.org/10.1504/ijpelec.2020.105148.

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30

Shayeghi. "Robust Decentralized Control of Unified Power Flow Controller." American Journal of Applied Sciences 6, no. 4 (April 1, 2009): 736–44. http://dx.doi.org/10.3844/ajassp.2009.736.744.

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31

Shayeghi, Hossein, and Ali Abdolalipo. "Robust Decentralized Control of Unified Power Flow Controller." American Journal of Applied Sciences 6, no. 4 (April 1, 2009): 736–44. http://dx.doi.org/10.3844/ajas.2009.736.744.

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32

Smith, K. S., L. Ran, and J. Penman. "Dynamic modelling of a unified power flow controller." IEE Proceedings - Generation, Transmission and Distribution 144, no. 1 (1997): 7. http://dx.doi.org/10.1049/ip-gtd:19970680.

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33

Keri, A. J. F., A. S. Mehraban, X. Lombard, A. Eiriachy, and A. A. Edris. "Unified power flow controller (UPFC): modeling and analysis." IEEE Transactions on Power Delivery 14, no. 2 (April 1999): 648–54. http://dx.doi.org/10.1109/61.754113.

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34

Matsuki, Junya, Yasuhiro Hayashi, Shunsuke Kitajima, Masahiro Takahashi, and Kenji Murata. "Experimental study on the Unified Power Flow Controller." Electrical Engineering in Japan 161, no. 2 (2007): 8–15. http://dx.doi.org/10.1002/eej.20538.

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35

Al-Mawsawi, S. Ali Abbas, Anwer Haider, and S. Ahmed Al-gallaf. "Design of Robust UPFC Based Damping Controller Using Biogeography Based Optimization." Indonesian Journal of Electrical Engineering and Computer Science 2, no. 3 (June 1, 2016): 554. http://dx.doi.org/10.11591/ijeecs.v2.i3.pp554-565.

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<p>In this paper a new optimization algorithm, the biogeography based optimization (BBO) is employed to design a robust power oscillation damping (POD) controller using unified power flow controller (UPFC). The controller that is used to damp low frequency oscillation is designed over a wide range of operating points using two different objective functions. The obtained controllers are then verified through time-domain simulation over different loading conditions with different system uncertainties introduced.</p>

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36

Tian, Ling Ling, and Dong Hai Li. "Chaos Control for the Unified Chaotic Systems." Applied Mechanics and Materials 511-512 (February 2014): 990–1001. http://dx.doi.org/10.4028/www.scientific.net/amm.511-512.990.

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Based on adaptive nonlinear feedback technique, two appropriate controllers are designed to suppress the chaotic behavior of the whole family of the generalized Lorenz system. The derived controllers have nonlinear compensator mechanisms to compensate the system nonlinearities and external disturbances. As a result the output trajectory control is accomplished. According to Lyapunov stability theory the stability analysis of the closed-loop control system is deduced. By numeric simulation, it has been shown that the designed controllers can successfully regulate the chaotic motion of the whole family of the system to a given point or make the output state to track a given bounded signal with great robustness. At the same time the required closed loop behavior is obtained. The most important effect of this letter is that under the actions of the universal controllers deduced from the adaptive technique the problem of chaos suppression of all the Lorenz-type systems can be solved successfully. Moreover the controllers have the ability of attenuating disturbances and the controller parameters are easy to tune according to rigorous analysis of stability. Based on theoretic analysis the designed controllers also provide a heuristic approach for other chaos suppression problems.

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37

Pilla, Azar, and Gorripotu. "Impact of Flexible AC Transmission System Devices on Automatic Generation Control with a Metaheuristic Based Fuzzy PID Controller." Energies 12, no. 21 (November 2, 2019): 4193. http://dx.doi.org/10.3390/en12214193.

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The present work proposes a teaching–learning-based optimization (TLBO)-tuned fuzzy proportional-integral-derivative (PID) controller of two-area hydro-thermal generating units for automatic generation control (AGC). The proposed system takes into account the physical constraints such as transport delay (TD), generation rate constraint (GRC), and governor dead band (GDB) nonlinearities. Firstly, fuzzy PID controllers were designed for both the areas and their gains were optimized using various minimization objective function criteria. Furthermore, applications of flexible alternating current transmission system (FACTS) devices such as static synchronous series compensator (SSSC), thyristor-controlled series capacitor (TCSC), thyristor-controlled phase shifter (TCPS), and unified power flow controller (UPFC) were investigated by integrating FACTS devices in appropriate locations of the system. The simulation results revealed that the minimum objective values were attained when the UPFC was placed in the system. Lastly, robustness analysis was done to observe the capability of the proposed controller with UPFC by changing system parameters and considering random load disturbances.

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38

Andaluz, Víctor H., Cristian M. Gallardo, Fernando A. Chicaiza, Christian P. Carvajal, José Morales, Giovanny Cuzco, Vicente Morales, Byron E. Vaca, and Nicolay Samaniego. "Robot nonlinear control for Unmanned Aerial Vehicles’ multitasking." Assembly Automation 38, no. 5 (November 5, 2018): 645–60. http://dx.doi.org/10.1108/aa-02-2018-036.

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Purpose This paper aims to present a unified motion control scheme for quadcopters which not only solves the point stabilization and trajectory tracking problems but also the path following problem. Design/methodology/approach The control problem is solved based on the kinematic model of the unmanned aerial vehicles (UAV). Next, a dynamic compensation controller is considered through of a quadcopter-inner-loop system to independently track four velocity commands: forward, lateral, up/downward and heading rate. Stability and robustness of the whole control system are proved through the Lyapunov’s method. To evaluate the controller’s performance, a multi-user application which allows bilateral communication between a ground station and the Phantom 3 PRO quadrotor is developed. Findings The performance of the proposed unified controller is shown through real experiments for the different motion control objectives: point stabilization, trajectory tracking and path following. The experiments confirm the capability of the unified controller to solve different motion problems by an adequate selection of the control references. Originality/value This work proposes the design of three types of motion controllers, which can be switched to comply a task in outdoor. Based on the software development kit provided by the company DJI, an application to get and send data to the UAV is developed. By means of this application, the three tasks are tested and the robustness of the controllers is proved.

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39

Iwasaki, T., and R. E. Skelton. "A unified approach to fixed-order controller design via linear matrix inequalities." Mathematical Problems in Engineering 1, no. 1 (1995): 59–75. http://dx.doi.org/10.1155/s1024123x9500007x.

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We consider the design of fixed-order (or low-order) linear controllers which meet certain performance and/or robustness specifications. The following three problems are considered; covariance control as a nominal performance problem,𝒬-stabilization as a robust stabilization problem, and robustL∞control problem as a robust performance problem. All three control problems are converted to a single linear algebra problem of solving a linear matrix inequality (LMI) of the typeBGC+(BGC)T+Q<0for the unknown matrixG. Thus this paper addresses the fixed-order controller design problem in a unified way. Necessary and sufficient conditions for the existence of a fixed-order controller which satisfies the design specifications for each problem are derived, and an explicit controller formula is given. In any case, the resulting problem is shown to be a search for a (structured) positive definite matrixXsuch thatX∈𝒞1andX−1∈𝒞2where𝒞1and𝒞2are convex sets defined by LMIs. Computational aspects of the nonconvex LMI problem are discussed.

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40

Razza, Valentino, and Abdul Salam. "A Unified Framework for the H∞ Mixed-Sensitivity Design of Fixed Structure Controllers through Putinar Positivstellensatz." Machines 9, no. 8 (August 20, 2021): 176. http://dx.doi.org/10.3390/machines9080176.

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In this paper, we present a novel technique to design fixed structure controllers, for both continuous-time and discrete-time systems, through an H∞ mixed sensitivity approach. We first define the feasible controller parameter set, which is the set of the controller parameters that guarantee robust stability of the closed-loop system and the achievement of the nominal performance requirements. Then, thanks to Putinar positivstellensatz, we compute a convex relaxation of the original feasible controller parameter set and we formulate the original H∞ controller design problem as the non-emptiness test of a set defined by sum-of-squares polynomials. Two numerical simulations and one experimental example show the effectiveness of the proposed approach.

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41

S, Parvathy, K. C. Sindhu Thampatty, and T. N. Padmanabhan Nambiar. "Design and Implementation of Partial Feedback Linearization Controller for Unified Power Flow Controller." Electric Power Systems Research 187 (October 2020): 106438. http://dx.doi.org/10.1016/j.epsr.2020.106438.

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42

Precup, Radu Emil, Marius L. Tomescu, and Emil M. Petriu. "A Unified Anti-Windup Technique for Fuzzy and Sliding Mode Controllers." International Journal of Computers Communications & Control 10, no. 6 (October 3, 2015): 83. http://dx.doi.org/10.15837/ijccc.2015.6.2075.

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This paper proposes the unified treatment of an anti-windup technique for fuzzy and sliding mode controllers. A back-calculation and tracking anti-windup scheme is proposed in order to prevent the zero error integrator wind-up in the structures of state feedback fuzzy controllers and sliding mode controllers. The state feedback sliding mode controllers are based on the state feedback-based computation of the switching variable. An example that copes with the position control of an electro-hydraulic servo-system is presented. The conclusions are pointed out on the basis of digital simulation results for the state feedback fuzzy controller.

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PARK, JU H., D. H. JI, S. C. WON, and S. M. LEE. "ADAPTIVE ℋ∞ SYNCHRONIZATION OF UNIFIED CHAOTIC SYSTEMS." Modern Physics Letters B 23, no. 09 (April 10, 2009): 1157–69. http://dx.doi.org/10.1142/s021798490901934x.

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In this paper, the problem of adaptive ℋ∞ synchronization for unified chaotic systems with unknown parameter and external disturbance is studied. It is noticed that this unified chaotic system contains the noted Lorentz, Lü and Chen systems. Based on Lyapunov theory and linear matrix inequality (LMI) formulation, the novel feedback controller with adaptive law is established to not only guarantee stable synchronization of both master and slave systems but also reduce the effect of external disturbance to an ℋ∞ norm constraint. A criterion for existence of the controller is given in terms of LMIs. Finally, a numerical example shows the effectiveness of the proposed method.

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Sadegh, Nader, Roberto Horowitz, Wei-Wen Kao, and Masayoshi Tomizuka. "A Unified Approach to the Design of Adaptive and Repetitive Controllers for Robotic Manipulators." Journal of Dynamic Systems, Measurement, and Control 112, no. 4 (December 1, 1990): 618–29. http://dx.doi.org/10.1115/1.2896187.

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A unified approach, based on Lyapunov theory, for synthesis and stability analysis of adaptive and repetitive controllers for mechanical manipulators is presented. This approach utilizes the passivity properties of the manipulator dynamics to derive control laws which guarantee asymptotic trajectory following, without requiring exact knowledge of the manipulator dynamic parameters. The manipulator overall controller consists of a fixed PD action and an adaptive and/or repetitive action for feed-forward compensations. The nonlinear feedforward compensation is adjusted utilizing a linear combination of the tracking velocity and position errors. The repetitive compensator is recommended for tasks in which the desired trajectory is periodic. The repetitive control input is adjusted periodically without requiring knowledge of the explicit structure of the manipulator model. The adaptive compensator, on the other hand, may be used for more general trajectories. However, explicit information regarding the dynamic model structure is required in the parameter adaptation. For discrete time implementations, a hybrid version of the repetitive controller is derived and its global stability is proven. A simulation study is conducted to evaluate the performance of the repetitive controller, and its hybrid version. The hybrid repetitive controller is also implemented in the Berkeley/NSK SCARA type robot arm.

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Bhalerao, ApurvaA, and Prof PriteeR Rane. "MODELING OF PHOTOVOLATIC SYSTEM AND UNIFIED POWER FLOW CONTROLLER." International Journal of Advanced Research 4, no. 11 (November 30, 2016): 1599–605. http://dx.doi.org/10.21474/ijar01/2250.

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Wang, J., and F. Z. Peng. "Unified Power Flow Controller Using the Cascade Multilevel Inverter." IEEE Transactions on Power Electronics 19, no. 4 (July 2004): 1077–84. http://dx.doi.org/10.1109/tpel.2004.830073.

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Verma, K. S., S. N. Singh, and H. O. Gupta. "Location of unified power flow controller for congestion management." Electric Power Systems Research 58, no. 2 (June 2001): 89–96. http://dx.doi.org/10.1016/s0378-7796(01)00123-7.

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Leon, A. E., S. J. Amodeo, J. A. Solsona, and M. I. Valla. "Non-linear optimal controller for unified power quality conditioners." IET Power Electronics 4, no. 4 (2011): 435. http://dx.doi.org/10.1049/iet-pel.2010.0134.

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Papic, I., and A. M. Gole. "Frequency response characteristics of the unified power flow controller." IEEE Transactions on Power Delivery 18, no. 4 (October 2003): 1394–402. http://dx.doi.org/10.1109/tpwrd.2003.817729.

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Chen, Baichao, Wenli Fei, Cuihua Tian, and Jiaxin Yuan. "Research on an Improved Hybrid Unified Power Flow Controller." IEEE Transactions on Industry Applications 54, no. 6 (November 2018): 5649–60. http://dx.doi.org/10.1109/tia.2018.2848654.

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