变流器型分布式电源的短路电流响应特性

Short-circuit current characteristics of inverter based distributed generators

分布式电源的短路电流计算是含分布式电源配电网的故障分析的基础。针对变流器并网型分布式电源,在分析电压源变流器控制系统结构的基础上,仿真研究了幅相控制、矢量解耦控制和电流瞬时值跟踪控制策略下变流器的短路电流变化特征,给出了配电网最严重短路情况下变流器型分布式电源输出电流的统一表达式。最后通过示例说明了分布式电源出力对短路电流的影响。

The short-circuit current calculation of inverter based distributed generators（ DG） is necessary for the fault analysis of grid with DGs. This paper mainly discussed the short-circuit current characteristics of inverter based DG,which is seriously related to the converter topology and control strategy. By analyzing the control strategy of voltage source converter and simulation verification,the current response of the inverter based DG with different control algorithms（ such as phase-amplitude control,vector decoupled control and instantaneous current tracking control） was investigated,and the universal analytical equation of current during the most seriously fault was presented. Finally the impact of available maximum power from DG on the fault current was demonstrated by a simulation example.