首页|Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of Droop-controlled Inverters
Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of Droop-controlled Inverters
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
国家科技期刊平台
NETL
NSTL
万方数据
Since the fault dynamic of droop-controlled inverter is different from synchronous generators(SGs),protection de-vices may become invalid,and the fault overcurrent may damage power electronic devices and threaten the safety of the microgrid.Therefore,it is imperative to conduct a comprehensive fault analysis of the inverter to guide the design of protection schemes.However,due to the complexity of droop control strategy,existing literatures have simplified asymmetric fault analysis of droop-controlled inverters to varying degrees.Therefore,accurate fault analysis of a droop-controlled inverter is needed.In this paper,by analyzing the control system,an accurate fault model is established.Based on this,a calculation method for instantaneous asymmetrical fault current is proposed.In addition,the current components and current characteristics are analyzed.It was determined that fault currents are affected by control loops,fault types,fault distance and nonlinear limiters.In particular,the influences of limiters on the fault model,fault current calculation and fault current characteristics were analyzed.Through detailed analysis,it was found that dynamics of the control loop cannot be ignored,the fault type and fault distance determine fault current level,and part of the limiters will totally change the fault current trend.Finally,calculation and experimental results verify the correctness of the proposed method.
Asymmetrical fault analysisdroop controlfault current calculation methodlimitertransient fault characteristics
国家科技期刊平台
NSTL
万方数据
