Stability problems of PV inverter in weak grid: a review-Qianjin Zhang, Mingxuan Mao, Guo Ke, Lin Zhou, Bao Xie-State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044,People's Republic of China-IET POWER ELECTRONICS

 

Stability problems of PV inverter in weak grid:a review Qianjin Zhang1, Mingxuan Mao1,2, Guo Ke1, Lin Zhou1, Bao Xie11State Key 

Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044,People's Republic of China

2Postdoctoral Station of Electrical Engineering, Chongqing University, Chongqing 400044, People's Republic of China E-mail: mingxuan_mao@cqu.edu.cn

Abstract:

 Photovoltaic (PV) power generation, as one important part of renewable energy, has been greatly developed in recentyears. The stability of PV inverters is very important for the normal operation of PV systems. However, most PV systems,especially the large PV plants, locate in rural areas. The corresponding equivalent grid impedance is rather large and easy tolead to stability problems of grid-connected inverters and many researches have been done focusing on the stability problems.In this study, a survey of stability problems of PV inverters on weak grid condition is given. The stability problems are mainlydivided into two parts, i.e. the control loops instability and inverter output voltage instability. The control loops cover the currentloop and dc voltage loop. The output voltage instability refers to the voltage phasors relationship and the application of reactivepower compensation. The non-linear parts of inverter dead-time, digital control delay, and phase-locked loop are explored.Future trends and challenges are given

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https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/iet-pel.2019.1049