The Experts below are selected from a list of 14829 Experts worldwide ranked by ideXlab platform
Zhe Chen - One of the best experts on this subject based on the ideXlab platform.
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effect of reActive Power characteristic of offshore wind Power plant on low frequency stability
IEEE Transactions on Energy Conversion, 2020Co-Authors: Weihua Zhou, Yanbo Wang, Raymundo E Torresolguin, Zhe ChenAbstract:Oscillation phenomena of offshore wind Power plant (OWPP) in a wide frequency range can be caused due to impedance interactions between grid-connected inverters (GCIs) and transmission cables. In this article, impedance model of GCI with outer Power control loop, inner current control loop and phase-locked loop is first established in dq Reference frame. The correctness is validated by frequency scanning method. Then, the effects of Active and reActive Power/current References on dq impedance characteristics of GCI with/without consideration of Power control loop are investigated using complex space vectors and complex transfer functions. Furthermore, RLC circuit model of transmission cable considering frequency-dependent characteristics is also established for dq-domain IBSC. On the basis of them, it's found that low-frequency oscillation phenomena of OWPP under Power control mode may occur if Active Power Reference exceeds a certain threshold value, which can be mitigated by injecting a certain amount of negative reActive Power. Impacts of PLL parameters, length of transmission cable and number of paralleled GCIs on required negative reActive Power for low-frequency stabilization are further investigated. Both Matlab/Simulink-based simulation and OPAL-RT-based real-time verification are implemented in an OWPP with four permanent magnet synchronous generators to validate the correctness of the reActive Power characteristic analysis results and the feasibility of mitigating low-frequency oscillation phenomena by negative reActive Power injection.
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optimal Power control strategy of maximizing wind energy tracking and conversion for vscf doubly fed induction generator system
International Power Electronics and Motion Control Conference, 2006Co-Authors: Hui Li, Zhe Chen, John Kim PedersenAbstract:This paper focuses on the development of maximum wind Power extraction strategies for variable speed constant frequency (VSCF) grid-connected wind Power generation systems with a doubly fed induction generator (DFIG). A new optimal control method is proposed by controlling the generator stator Active and reActive Power, which is based on the condition of the system operation for not only the extracted maximum Power of the wind turbine below the rated wind speed but also the higher generator efficiency. Based on the DFIG mathematical models, the optimal stator reActive Power value is derived for minimal machine copper losses. According to wind turbine Power characteristics and generator Power flow equations, the optimal stator Active Power Reference value is also obtained for capturing maximal output Power from wind turbines. A dual-passage excitation control strategy is applied to control the Active and reActive Power independently. Detailed simulation results have confirmed the feasibility and performance of the optimal control strategy.
Weihua Zhou - One of the best experts on this subject based on the ideXlab platform.
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effect of reActive Power characteristic of offshore wind Power plant on low frequency stability
IEEE Transactions on Energy Conversion, 2020Co-Authors: Weihua Zhou, Yanbo Wang, Raymundo E Torresolguin, Zhe ChenAbstract:Oscillation phenomena of offshore wind Power plant (OWPP) in a wide frequency range can be caused due to impedance interactions between grid-connected inverters (GCIs) and transmission cables. In this article, impedance model of GCI with outer Power control loop, inner current control loop and phase-locked loop is first established in dq Reference frame. The correctness is validated by frequency scanning method. Then, the effects of Active and reActive Power/current References on dq impedance characteristics of GCI with/without consideration of Power control loop are investigated using complex space vectors and complex transfer functions. Furthermore, RLC circuit model of transmission cable considering frequency-dependent characteristics is also established for dq-domain IBSC. On the basis of them, it's found that low-frequency oscillation phenomena of OWPP under Power control mode may occur if Active Power Reference exceeds a certain threshold value, which can be mitigated by injecting a certain amount of negative reActive Power. Impacts of PLL parameters, length of transmission cable and number of paralleled GCIs on required negative reActive Power for low-frequency stabilization are further investigated. Both Matlab/Simulink-based simulation and OPAL-RT-based real-time verification are implemented in an OWPP with four permanent magnet synchronous generators to validate the correctness of the reActive Power characteristic analysis results and the feasibility of mitigating low-frequency oscillation phenomena by negative reActive Power injection.
Sukumar Kamalasadan - One of the best experts on this subject based on the ideXlab platform.
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a dynamic coordination control architecture for reActive Power capability enhancement of the dfig based wind Power generation
IEEE Transactions on Power Systems, 2020Co-Authors: Sudipta Ghosh, Younes J Isbeih, Rojan Bhattarai, Mohamed Shawky El Moursi, E F Elsaadany, Sukumar KamalasadanAbstract:This paper presents a dynamic coordination control strategy to enhance the reActive Power capability of wind Power plants (WPPs) which deploy doubly-fed induction generator-based wind turbines (DFIG-WTs). The proposed control architecture seeks to maximize reActive Power availability during grid faults without violating the stable and thermal operational limits of the generator. To achieve this objective, the presented control topology calculates the maximum available reActive Power that can be provided by the DFIG-based WPP under any disturbed operation of a Power system. The Reference value of the required reActive Power compensation is thereafter calculated using an adaptive proportional-integral (PI) regulator which outperforms the traditional PI controller. The computed Reference value is directly applied to the outer control of the rotor side converter (RSC) to regulate reActive Power generation of the stator circuit. Furthermore, the $P-V$ droop characteristics of the induction generator is employed to adjust the Active Power Reference of the RSC converter to increase the reActive Power capability during grid faults. Meanwhile, de-rating the Active Power generation of the DFIG-based WT is accompanied with modifying the pitch angle of the rotor blades to balance the mechanical and electromagnetic torques and to avoid any stresses excreted on the mechanical parts of the WT. If rotor current limits are reached and more reActive Power support is still required, the responsible control loop of the grid side converter (GSC) will be activated and augmented to enhance the overall reActive Power capability of the DFIG-based WPP. Finally, the proposed control strategy is verified using Two area four machines and IEEE 68 bus test systems.
Raymundo E Torresolguin - One of the best experts on this subject based on the ideXlab platform.
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effect of reActive Power characteristic of offshore wind Power plant on low frequency stability
IEEE Transactions on Energy Conversion, 2020Co-Authors: Weihua Zhou, Yanbo Wang, Raymundo E Torresolguin, Zhe ChenAbstract:Oscillation phenomena of offshore wind Power plant (OWPP) in a wide frequency range can be caused due to impedance interactions between grid-connected inverters (GCIs) and transmission cables. In this article, impedance model of GCI with outer Power control loop, inner current control loop and phase-locked loop is first established in dq Reference frame. The correctness is validated by frequency scanning method. Then, the effects of Active and reActive Power/current References on dq impedance characteristics of GCI with/without consideration of Power control loop are investigated using complex space vectors and complex transfer functions. Furthermore, RLC circuit model of transmission cable considering frequency-dependent characteristics is also established for dq-domain IBSC. On the basis of them, it's found that low-frequency oscillation phenomena of OWPP under Power control mode may occur if Active Power Reference exceeds a certain threshold value, which can be mitigated by injecting a certain amount of negative reActive Power. Impacts of PLL parameters, length of transmission cable and number of paralleled GCIs on required negative reActive Power for low-frequency stabilization are further investigated. Both Matlab/Simulink-based simulation and OPAL-RT-based real-time verification are implemented in an OWPP with four permanent magnet synchronous generators to validate the correctness of the reActive Power characteristic analysis results and the feasibility of mitigating low-frequency oscillation phenomena by negative reActive Power injection.
Yanbo Wang - One of the best experts on this subject based on the ideXlab platform.
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effect of reActive Power characteristic of offshore wind Power plant on low frequency stability
IEEE Transactions on Energy Conversion, 2020Co-Authors: Weihua Zhou, Yanbo Wang, Raymundo E Torresolguin, Zhe ChenAbstract:Oscillation phenomena of offshore wind Power plant (OWPP) in a wide frequency range can be caused due to impedance interactions between grid-connected inverters (GCIs) and transmission cables. In this article, impedance model of GCI with outer Power control loop, inner current control loop and phase-locked loop is first established in dq Reference frame. The correctness is validated by frequency scanning method. Then, the effects of Active and reActive Power/current References on dq impedance characteristics of GCI with/without consideration of Power control loop are investigated using complex space vectors and complex transfer functions. Furthermore, RLC circuit model of transmission cable considering frequency-dependent characteristics is also established for dq-domain IBSC. On the basis of them, it's found that low-frequency oscillation phenomena of OWPP under Power control mode may occur if Active Power Reference exceeds a certain threshold value, which can be mitigated by injecting a certain amount of negative reActive Power. Impacts of PLL parameters, length of transmission cable and number of paralleled GCIs on required negative reActive Power for low-frequency stabilization are further investigated. Both Matlab/Simulink-based simulation and OPAL-RT-based real-time verification are implemented in an OWPP with four permanent magnet synchronous generators to validate the correctness of the reActive Power characteristic analysis results and the feasibility of mitigating low-frequency oscillation phenomena by negative reActive Power injection.
