Research on simulation method of parameter asymmetry in power grid fault calculation

power grid;  fault calculation;  parameter asymmetry;  Simulation

By introducing virtual branches and virtual nodes, a virtual port with simulated parameter asymmetry is established, and the parameter asymmetric power grid is decomposed into a symmetric network part and an asymmetric network part with simulated parameter asymmetry with the virtual port as the boundary. According to the basic principle of the compensation method, the injection current from the virtual port to the symmetric network is used as the compensation current to convert the parameter asymmetric power grid into a symmetrical power grid. After converting the asymmetric power grid into a symmetric power grid, various fault calculation methods based on symmetric component method can be used to calculate the fault of the power grid. Finally, an asymmetric system short-circuit fault is taken as an example to calculate, and the results prove that the algorithm is effective.