The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Boon-teck Ooi - One of the best experts on this subject based on the ideXlab platform.
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optimal acquisition and aggregation of offshore wind power by multiterminal voltage source hvdc
IEEE Power & Energy Magazine, 2002Co-Authors: Boon-teck OoiAbstract:This paper addresses the exploitation of the offshore wind energy. A good example is in the shallow coastal waters around the Baltic Sea where there is high potential for wind turbines, located 10-30 km from the shore. The underwater transmission of power to shore has to be by cables. Therefore, DC transmission is required to avoid the large Capacitive Reactance currents of AC cables. This paper describes the optimal acquisition and aggregation of wind power by multiterminal high-voltage direct current based on sinusoidal pulse-width-modulated, three-phase voltage-source converters connected at their AC terminals to the wind turbine generators.
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Series-type solid-state static VAR compensator
IEEE Transactions on Power Electronics, 1993Co-Authors: Boon-teck Ooi, S.-z. DaiAbstract:A fast response, electronically controlled, continuously variable, equivalent Capacitive Reactance for series compensation of a utility transmission line is described. Unlike compensation by series dielectric capacitors, there is no fear of subsynchronous resonance (SSR) instability. A high level of compensation is possible because there is no danger of forced resonance by the supply frequency. Experimental and digital simulation results are presented. >
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Solid-state series Capacitive Reactance compensators
IEEE Transactions on Power Delivery, 1992Co-Authors: Boon-teck Ooi, S.-z. Dai, X. WangAbstract:Laboratory research on the series-type solid-state variable Capacitive Reactance compensators based on (1) the voltage-source converter topology and (2) the current-source converter topology is reported. The two topologies are circuit duals of each other and are studied together to evaluate their relative merits. The Capacitive Reactance compensators are based on GTOs, which have both gate-turn-on and gate-turn-off capabilities, operated under pulse width modulation (PWM). The practicality of the concepts is demonstrated by 1 kVA size bipolar transistors converters as laboratory models of the GTO stations. After experimental demonstration, the research is followed by digital simulations. >
S.-z. Dai - One of the best experts on this subject based on the ideXlab platform.
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Series-type solid-state static VAR compensator
IEEE Transactions on Power Electronics, 1993Co-Authors: Boon-teck Ooi, S.-z. DaiAbstract:A fast response, electronically controlled, continuously variable, equivalent Capacitive Reactance for series compensation of a utility transmission line is described. Unlike compensation by series dielectric capacitors, there is no fear of subsynchronous resonance (SSR) instability. A high level of compensation is possible because there is no danger of forced resonance by the supply frequency. Experimental and digital simulation results are presented. >
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Solid-state series Capacitive Reactance compensators
IEEE Transactions on Power Delivery, 1992Co-Authors: Boon-teck Ooi, S.-z. Dai, X. WangAbstract:Laboratory research on the series-type solid-state variable Capacitive Reactance compensators based on (1) the voltage-source converter topology and (2) the current-source converter topology is reported. The two topologies are circuit duals of each other and are studied together to evaluate their relative merits. The Capacitive Reactance compensators are based on GTOs, which have both gate-turn-on and gate-turn-off capabilities, operated under pulse width modulation (PWM). The practicality of the concepts is demonstrated by 1 kVA size bipolar transistors converters as laboratory models of the GTO stations. After experimental demonstration, the research is followed by digital simulations. >
Ronald G. Harley - One of the best experts on this subject based on the ideXlab platform.
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New external neuro-controller for series Capacitive Reactance compensator in a power network
2013Co-Authors: Jung-wook Park, Ronald G. Harley, Ganesh K. Venayagamoorthy, Senior MemberAbstract:Abstract—The controllable Capacitive Reactance can be used as the input variable for the external controller of a series Capacitive Reactance compensator (SCRC) to improve the damping of low-frequency oscillations of the rotor angle and active power in a power system. Conventional linear PI controllers are tuned for best performance at one specific operating point of the nonlinear power system. At other operating point its performance degrades. Nonlinear optimal neuro-controllers are able to overcome this degradation. In this paper, the dual heuristic dynamic programming (DHP) optimization algorithm is applied to design an external nonlinear optimal neuro-controller for the SCRC. Simulation studies using PSCAD/EMTDC ® software are presented. Index Terms—Dual heuristic programming, flexible ac transmission systems devices, optimization, power system, series Capacitive Reactance compensator. I
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indirect adaptive external neuro control for a series Capacitive Reactance compensator based on a voltage source pwm converter in damping power oscillations
IEEE Transactions on Industrial Electronics, 2007Co-Authors: Wei Qiao, Ronald G. HarleyAbstract:A series Capacitive Reactance compensator (SCRC), using a voltage source converter to inject a controllable voltage in quadrature with the line current of a power network, is capable of rapidly providing a specified and controllable magnitude of Capacitive Reactance compensation independent of the line current. Moreover, with a suitably designed external controller, the SCRC can also be used to damp low-frequency power oscillations in a power network. Conventionally, linear control techniques are used to design the SCRC external controller around a specific operating point, where the nonlinear system equations are linearized. However, at other operating points its performance degrades. Nonlinear adaptive neuro-controllers offer an attractive approach to overcome this degradation problem. In this paper, an indirect adaptive external neuro-controller (INDAEC) using two radial basis function neural networks (RBFNNs) is proposed to improve the damping performance of an SCRC connected to a power network. This nonlinear INDAEC needs no mathematical model of the SCRC or the power network. It provides the SCRC with improved damping performance over a wide range of system operating conditions. This is shown by results on a single machine infinite bus power system, as well as a multimachine power system
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an indirect adaptive external neuro controller for series Capacitive Reactance compensator in damping power oscillations
International Conference on Intelligent Systems, 2005Co-Authors: Wei Qiao, Ronald G. HarleyAbstract:With a properly designed external controller, the series Capacitive Reactance compensator (SCRC) can be used to damp low frequency power oscillations in a power network. Conventionally, linear control techniques are used to design the external controller around a specific operating point where the nonlinear system equations are linearized. However, at other operating points its performance degrades. Nonlinear adaptive neuro-controllers offer an attractive approach to overcome this SCRC control problem. In this paper, a new indirect adaptive external neuro-controller (INDAEC) using radial basis function neural networks (RBFNN) is proposed to improve the damping performance of the SCRC. This nonlinear INDAEC needs no mathematical model of the SCRC and the power network. Results are included to show that it provides improved damping performance over a wide range of operating conditions
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New external neuro-controller for series Capacitive Reactance compensator in a power network
IEEE Transactions on Power Systems, 2004Co-Authors: Jung-wook Park, Ronald G. Harley, Ganesh K. VenayagamoorthyAbstract:The controllable Capacitive Reactance can be used as the input variable for the external controller of a series Capacitive Reactance compensator (SCRC) to improve the damping of low-frequency oscillations of the rotor angle and active power in a power system. Conventional linear PI controllers are tuned for best performance at one specific operating point of the nonlinear power system. At other operating point its performance degrades. Nonlinear optimal neuro-controllers are able to overcome this degradation. In this paper, the dual heuristic dynamic programming (DHP) optimization algorithm is applied to design an external nonlinear optimal neuro-controller for the SCRC. Simulation studies using PSCAD/EMTDC/spl reg/ software are presented.
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On-line identification of series Capacitive Reactance compensator in a multimachine power system using a radial basis function neural network
Proceedings of the Inaugural IEEE PES 2005 Conference and Exposition in Africa, 1Co-Authors: Wei Qiao, Ronald G. HarleyAbstract:With a properly designed external controller, the series Capacitive Reactance compensator (SCRC) can be used to damp low frequency power oscillations in a power network. Conventionally, linear control techniques are used to design the external controller for a SCRC around a specific operating point where the nonlinear system equations are linearized. However, at other operating points its performance degrades. The indirect adaptive neuro-control scheme offers an attractive approach to overcome this SCRC control problem. As an essential part of this control scheme, an adaptive neuro-identifier has to be firstly designed in order to provide an accurate dynamic plant model for the design of the external neuro-controller. In this paper, an adaptive neuro-identifier using a radial basis function neural network (RBFNN) is proposed for on-line identification of an SCRC connected to a multi-machine power system. Results are included to show that this RBF neuro-identifier continuously tracks the plant dynamics with good precision
X. Wang - One of the best experts on this subject based on the ideXlab platform.
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Solid-state series Capacitive Reactance compensators
IEEE Transactions on Power Delivery, 1992Co-Authors: Boon-teck Ooi, S.-z. Dai, X. WangAbstract:Laboratory research on the series-type solid-state variable Capacitive Reactance compensators based on (1) the voltage-source converter topology and (2) the current-source converter topology is reported. The two topologies are circuit duals of each other and are studied together to evaluate their relative merits. The Capacitive Reactance compensators are based on GTOs, which have both gate-turn-on and gate-turn-off capabilities, operated under pulse width modulation (PWM). The practicality of the concepts is demonstrated by 1 kVA size bipolar transistors converters as laboratory models of the GTO stations. After experimental demonstration, the research is followed by digital simulations. >
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A series Capacitive Reactance compensator based on voltage-source PWM converter
Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting, 1991Co-Authors: X. WangAbstract:A description is given of the use of a voltage-source PWM converter to provide series Capacitive Reactance compensation without the danger of subsynchronous resonance instability. Because dielectric capacitors are replaced with silicon switches, there is no possibility of resonance. Fast response is also achievable. >
M. Caro - One of the best experts on this subject based on the ideXlab platform.
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Background voltage distortion influence on power electric systems in the presence of the Steinmetz circuit
Electric Power Systems Research, 2009Co-Authors: Luis Sainz, Joaquin Pedra, M. CaroAbstract:Abstract In traction systems, it is usual to connect Reactances in delta configuration with single-phase loads to reduce voltage unbalances and avoid electric system operation problems. This set is known as Steinmetz circuit. Parallel and series resonances can occur due to the Capacitive Reactance of the Steinmetz circuit and affect power quality. In this paper, the series resonance “observed” from the supply system is numerically located. The study of this resonance is important to avoid problems due to background voltage distortion. Experimental measurements are also presented to validate the obtained numerical results.
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Influence of the Steinmetz Circuit Capacitor Failure on the Electric System Harmonic Response
IEEE Transactions on Power Delivery, 2007Co-Authors: Luis Sainz, Joaquin Pedra, M. CaroAbstract:Traction systems are generally single-phase loads that can cause voltage unbalances which affect the electric system operation. It is usual to delta-connect Reactances with these single-phase loads to reduce voltage unbalances. The set of Reactances and single-phase loads is known as a Steinmetz circuit. A parallel resonance can be produced between the Capacitive Reactance of the Steinmetz circuit and the system inductive Reactances, which can damage power quality. This paper locates the frequency of this parallel resonance analytically and studies the influence of capacitor loss with respect to its design value. Experimental measurements are also presented to validate the obtained analytical results
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Study of the power system harmonic response in the presence of the Steinmetz circuit
Electric Power Systems Research, 2006Co-Authors: M. Caro, Luis Sainz, Joaquin PedraAbstract:The Steinmetz circuit is constituted by single-phase loads, e.g. traction systems, delta-connected with Reactances to load the network with balanced currents. A parallel resonance between the Capacitive Reactance of the Steinmetz circuit and the power system Reactances can be produced, and therefore harmonic voltage distortion in the presence of non-linear loads increases. The paper studies this resonance analytically and presents an expression to locate it. Experimental measurements have also been made to validate the obtained analytical results.