多馈入直流输电系统的协调恢复策略研究

Research on coordinated recovery strategy for MIDC system

为了改善多馈入直流输电系统的恢复性能,提出了一种协调恢复策略。该策略通过直流双侧附加前馈控制实现多馈入直流各子系统的整流侧和逆变侧的协调,使两侧的控制量能够快速地跟踪系统的给定值;通过Fuzzy-VDCOL环节对系统故障和恢复期间的直流电流指令进行动态调节,维持系统的功率平衡和电压稳定,实现直流子系统之间的协调。仿真分析表明:该协调恢复策略可使多馈入直流输电系统的恢复性能得到很好地改善。

In order to improve the recovery performance of multi-infeed direct current （MIDC） system, a coordinated recovery strategy is proposed in this paper. The strategy applies additional feed forward control to coordinate the recti- fiers and inverters of the MIDC system, so that the control parameters can stick to the reference values of the system. A Fuzzy-VDCOL controller is adopted to dynamically adjust the direct current instructions during fault and recovery periods and to maintain the power balance and voltage stability, achieving the coordination among the sub-systems of MIDC. The simulation results verify that the proposed coordinated recovery strategy drastically improves the recovery performance of the MIDC system.