Fault Dynamic Behaviors Analysis and Practical Peak Short-circuit Current Calculation of Wind and Solar Power Sources
The study of fault dynamic behaviors and the peak short-circuit current of the wind and solar power sources will provide important evidence for rating the power equipment and setting the protective relays.However,the existing calculation methods rely too much on parameters,making it challenging to meet the requirements of engineering applications.To solve this problem,this paper first analyzes the fault dynamic behaviors of the photovoltaic(PV)source,the permanent magnet synchronous generator(PMSG),and the doubly fed induction generator(DFIG).On this basis,the concise and practical expressions of the peak short-circuit current are established.For the PV and PMSG,a transient fault current calculation model based on the power variation is developed in the constant power stage.The peak short-circuit current is calculated by analyzing the damping ratio in the limiting control stage.For the DFIG,the simplified condition of short-circuit current in the crowbar control stage is obtained by analyzing the coupling relation of the fluxes.In this way,the practical expression of the peak short-circuit current is solved.Simulation and test data verify the feasibility and accuracy of the proposed method.
wind and solar power sourcestransient fault analysisshort-circuit current calculationpeak short-circuit current
国家科技期刊平台
NSTL
万方数据
维普
