Reactive power compensation optimization configuration method to reduce the risk of multi-circuit DC commutation failure

Aiming at the risk of simultaneous commutation failure of multiple DCs in multi-infeed DC areas, a reactive power compensation optimization configuration method to reduce the risk of multiple DC commutation failures is proposed, and the type, location and capacity of reactive power compensation devices are configured. Firstly, the type of reactive power compensation devices is determined by comparing SVC and STATCOM simulation; Secondly, the weak voltage area through typical faults in multi-infeed DC areas is found, and then the best reactive power compensation site is determined according to the concept of node relative transient voltage drop area RTVDAI index; The aim is to reduce the effect index of commutation failure risk and project economy, the best installation plan is determined by controlling the investment cost and reducing the risk of commutation failure. The closeness in the entropy method is used to evaluate the advantages and disadvantages of each capacity configuration plan, and then CFTOOL toolbox in MATLAB is used to fit the comprehensive analysis index of nearness. The optimal installation capacity is determined by analyzing the fitting curve of the closeness comprehensive analysis index. Finally, the engineering applicability of the configuration scheme was verified through simulation.