Research On Complex Fault Calculation Based On Substation Simulation System For Training

Fault calculation is very important in power system analysis and calculation. In this paper, based on compensation method and the symmetrical components method, a unified model is established to calculate the faults of substation simulation and training system. On this basis, according to the superposition theory and the reciprocal theory, a versatile method to calculate faults is presented. Without modifying the nodal impedance parameters of the original network, the method is suited to all kinds of simple faults and complex faults. Fault calculation needs to constitute node impedance matrix. However, the constitution of node impedance matrix influences simulation speed because of the large-scale complex matrix inversion. Through analyzing current injection vector and simulation system features, the paper presents a fast algorithm for fault calculation. The algorithm can avoid irrelevant computation requirement in solving large sparse network equations, improve significantly the calculation speed, and save a lot of computation time. At the same time, in order to improve real-time ability of fault calculation, the application of parallel processing in fault calculation are discussed.