期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2018
卷号：170
期号：4
页码：042152
DOI：10.1088/1755-1315/170/4/042152
语种：English
出版社：IOP Publishing
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.
