Photovoltaic Grid Connected Inverter Crossing Control Method Based on Grid Voltage Feed forward Compensation

2nd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Zhao, Deren^1 ; Ji, Peng^1 ; Xia, Fei^1 ; Xia, Zongze^1 ; Huang, Xiaobo^1 ; Cong, Peixian^1 ; Yang, Zhixiong^2 ; Di, Zhuo^1 ; Song, Li^1

State Grid Liaoyang Electric Power Supply Company, Liaoyang

111000, China^1

Kunming Institute of Physics, Kunming

650223, China^2

关键词: Control strategies;    Grid voltage feed forwards;    Negative sequence;    Phase-lead compensation;    Photovoltaic grids;    PV grid-connected inverters;    Reactive currents;    Unbalanced grid voltages;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/170/4/042152/pdf
DOI  :  10.1088/1755-1315/170/4/042152

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

According to the requirements of relevant national standards, large photovoltaic grid connected inverters need to have zero voltage ride through (ZVRT) capability to prevent low voltage automatic disconnection, thus affecting the normal and stable operation of power system. On the basis of analyzing the ZVRT standard of PV grid connected inverter, the key technologies of inverter realizing ZVRT are discussed in detail, including grid voltage positive and negative sequence separation and phase locking, active and reactive current control of inverter, system control under unbalanced grid voltage and so on. On this basis, it is further proposed that the grid voltage feed forward component phase lead compensation link should be introduced into the system current loop, so as to improve the transient overshoot of grid connected fault. Finally, the correctness and effectiveness of the ZVRT control strategy of the PV grid connected inverter is verified by the experimental results of RTDS and a 500 kW prototype.