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YANG Ming,DU Shaotong,ZHENG Zheng,ZHU Yifeng,LI Bin.Resonance Mechanism and Stability Analysis of Large-scale Grid-connected Photovoltaic System[J].JOURNAL OF POWER SUPPLY,2019,17(1):53-61
Resonance Mechanism and Stability Analysis of Large-scale Grid-connected Photovoltaic System
Received:March 19, 2017  Revised:January 04, 2019
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DOI:10.13234/j.issn.2095-2805.2019.1.53
Keywords:large-scale PV plant  weak grid  harmonic resonance  stability margin  stability
Fund Project:National Natural Science Foundation of China (51477021, U1504518); Key Research Projects of Henan Higher Education (17A470010).
              
AuthorInstitutionEmail
YANG Ming School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo , China yangming0391@163.com
DU Shaotong School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo , China
ZHENG Zheng School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo , China
ZHU Yifeng School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo , China
LI Bin State Key Laboratory of Power Transmission Equipment & System Security and New TechnologChongqing University, Chongqing , China
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Abstract:
      Under weak grid conditions or when the capacities of photovoltaic(PV) power plants increase, a large-scale grid-connected PV system will easily cause harmonic resonance, which endangers the normal and stable operation of PV power plants. In consideration of the above problems, the large scale grid-connected PV system is taken as the research object in this paper, and the resonance mechanism between the large scale PV power plant and grid is revealed from aspects including system damping and closed loop control. Theoretical analysis indicates that the active damping strategy for the LCC filter itself will not cause harmonic resonance to the system, and the key factor is the stability margin of the grid-connected inverter. The combined effect of factors, such as grid impedance, plant capacity, design of system parameters, and control strategy, can make the grid-connected inverter run in a critical stable state under a specific condition and further cause harmonic resonance, producing a large amount of harmonics in the corresponding resonance frequency band. With further shrinking of the stability margin, the system will gradually transit from the resonance state to the unstable states of oscillation and divergence. Simulation and experimental results validated the theoretical analysis.
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