基于PCHD模型的VSC-HVDC系统的L_2增益控制

L2 Gain Control of VSC－HVDC System Based on PCHD Model

基于轻型高压直流输电系统的端口受控哈密顿系统(PCHD)模型,提出了一种针对基于电压源换流器的轻型高压直流(VSC-HVDC)输电系统的L2增益控制新方法。首先根据VSC-HVDC的不同控制方式,确定相应的dq坐标下的电流参考值。在此基础上,根据控制目标和能量平衡的关系设计误差系统的能量存储函数,通过L2增益控制的方法设计控制器,实现对参考电流的渐近追踪和对外界干扰的抑制。仿真结果验证了所提出的控制策略的正确性和有效性。

Based on the port -controlled Hamilton with dissipation （PCHD） model, a new L2 -gain repetitive control strategy of voltage sourced converter based high voltage direct current （ VSC - HVDC） system is proposed. In the theory, the converter model of VSC - HVDC is equivalent to a dissipative passive system, and according to different control modes of VSC - HVDC, the reference currents in the corresponding dq -axis are determined. On the basis, L2 -gain repetitive controller is designed to trace the reference currents and suppress the external disturbances. The simulation results verify the validity of the proposed control strategy.