摘要
为了消除电网的不稳定性因素和改善电能质量,通过引述行业对风能的诠释,针对某光伏逆变器在试验过程中出现的典型穿越能力故障,采用Matlab/Simulink对系统故障试验过程中的波形进行了分析,重点分析了系统不平衡故障条件下的试验情况及相关特性。分析结果表明,通过采用电网二次谐波等相关的正序、负序、零序、稳态锁相环(PLL)技术,可有效改善传统的d、q框架控制策略,进而有效改善光伏逆变器在电网故障穿越期间的电能质量。
In order to eliminate unstable thctor and improve the electrical energy quality, this paper introduced tile requirements of new energy industry to the wind energy, and analyzd the waveform of a traditional photovohaic inverter in the period of grid fault via Maflah Simulink based on the fault ride through phenomenon. It was focussed mainly on the analysis of test phenomenon and related characters in the unbalanced grid fault period. Through the analysis, it is necessary to improve the traditional d,q frame control strategy by additional methods su(;h as positive (PS), negative(NS) and zero sequence(ZS) separation, stable phase locked loop(PLL) due to the 2nd order power harmoni^s and synchronization reasons during unbalanced grid faults. The output electrical energy quality of t^hotovoltaie inverter durin~ the grid fault t^criod can be improved greatly.
出处
《低压电器》
2013年第2期38-43,56,共7页
Low Voltage Apparatus
关键词
分布式发电系统
电能质量
低电压穿越
锁相环
电网二次谐波
distributed power generation system ( DPGS )
electrical energy quality
low voltage ridethrough ( LVRT )
phase locked loop (PLL)
second order harmonics