基于灰色预测PI的HVDC受端系统调相机励磁控制策略OA

Aiming at the problem that the conventional PI excitation control was prone to bus voltage overshoot and oscillation in the fault recovery stage after the large capacity synchronous condenser was connected to the high volt-age direct current(HVDC)receiving end system,a PI excitation control strategy of synchronous condenser based on grey prediction model GM(1,1)was proposed in this study.In this strategy the predicted value of voltage devia-tion was obtained in advance by grey modeling and trend prediction of the receiving bus voltage sequence,and was used as the input of the PI controller to realize the forward-looking adjustment of the excitation voltage.Based on the CIGRE standard test system,a PSCAD/EMTDC and MATLAB/Simulink co-simulation platform was construc-ted.Under various typical disturbance conditions,the dynamic response characteristics of grey prediction PI control and conventional PI control were compared and analyzed.The simulation results showed that the proposed control strategy could effectively compensate the large inertia lag of the excitation system,significantly suppress the bus voltage overshoot and shorten the system adjustment time.With the three-phase short-circuit fault,the minimum value of bus voltage was increased by about 4.5 kV,the minimum value of DC transmission power was increased by about 31 MW,and the system recovery time was significantly shortened.This method had the characteristics of low computational complexity and strong real-time performance,which could provide an effective technical way for the optimization of excitation control of synchronous condenser in HVDC receiving-end system.