基于最优变目标的HVDC与SVC非线性综合协调控制

直流功率调制能有效地提高交直流系统的稳定性,但同时直流换流站也要消耗大量的无功,影响交流系统的电压稳定。为此,提出了基于最优变目标的HVDC与SVC综合控制策略,通过直流功率调制改善系统稳定性的同时,利用SVC来对直流逆变侧进行无功补偿,使逆变侧电压更具稳定性。首先建立了交直流混合系统中HVDC与SVC的综合控制模型,在此基础上,推导出基于最优变目标的控制理论的HVDC与SVC非线性综合控制策略。仿真结果表明,以该控制策略设计的控制器能有效地提高系统阻尼,改善逆变侧交流母线电压特性。

Complex nonlinear control of HVDC and SVC based on OVAC

HVDC power modulation can improve the stability of AC/DC systems,but the converter will consume much of reactive power,which influences the AC system voltage.For this reason,a complex control strategy of HVDC and SVC based on optimal variable object control theory is proposed,HVDC is adopted to improve system stability,meanwhile,SVC is adopted to compensate reactive power of inverter so that it makes the voltage at inverter side more stabile.First,the model of HVDC and SVC is built,and then the complex nonlinear strategy is deduced.The simulation results show that this controller can improve the system damping and the inverter side AC voltage. This project is supported by National Natural Science Foundation of China(No.5077017),XJ Special Fund for Electric Power Technology and Special Fund of the National Basic Research Program of China(No.2004CBZ17909).