摘要
某些条件下电网会发生不平衡故障,三相并网逆变器将受到影响,使得输出并网电流谐波含量大,对电网造成污染,严重时会导致并网逆变器无法正常工作,甚至损坏元器件。因此对三相并网逆变器在电网发生不平衡故障时控制策略的研究十分必要。本文论述了基于抑制逆变器交流侧负序电流的控制策略和基于抑制逆变器直流侧电压二次谐波的控制策略,并分别对2种控制策略的控制结果进行理论分析比较,同时利用PSCAD仿真软件,对2种控制策略进行了仿真分析。
The fault of unbalance in the power grid is sometimes happened under certain conditions, and the three-phase grid connected inverter will be affected, leading to high harmonic contents of the output grid current and pollution to the grid and, in case of serious cases, the grid inverter cannot operate properly and even damaged components. Therefore, it is necessary to study the control strategy of the three-phase grid inverter at the unbalance fault of grid. In this paper, the control strategy based on suppressing the negative sequence current on the AC side of inverter and the control strategy based on the secondary harmonics of voltage on the DC side of the inverter are described. The control results of two control strategies are analyzed and compared theoretically, meanwhile, the two control strategies are simulated and analyzed by PSCAD simulation software.
出处
《电力电容器与无功补偿》
北大核心
2016年第1期71-75,85,共6页
Power Capacitor & Reactive Power Compensation
基金
中国博士后科学基金资助项目(2015T80729)
关键词
光伏发电
并网逆变器
三相不平衡
photovoltaic power generation
grid inverter
three-phase unbalance
