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高压直流输电系统是一个典型的非线性时变动态系统,如果采用常规的PI控制,在系统遭受大扰动或运行方式切换时,将难以获得有效的控制效果。文中简要介绍了协同控制理论的基本原理,并针对高压直流输电系统,设计了一种基于协同控制理论的定直流电流、定直流电压的非线性控制算法。最后,将设计的控制策略应用于CIGRE标准直流输电测试系统进行验证,仿真结果表明该控制策略使系统的启动过程快速、平稳;当系统运行模式发生改变时,不仅能够实现对控制目标快速跟随,同时能有效解决运行点发生改变带来的直流电压和电流波动问题。
The HVDC system is a typical nonlinear time-varying dynamic system. If the conventional PI control is adopted, it will be difficult to obtain effective control effects when the system suffers large disturbance or switching operation mode. In this paper, the basic principle of cooperative control theory is briefly introduced. For the HVDC transmission system, a nonlinear control algorithm of DC-DC and DC-DC voltage is designed based on the cooperative control theory. Finally, the designed control strategy is applied to CIGRE HVDC test system to verify the simulation results show that the control strategy makes the system start-up process fast and stable; when the system operating mode changes, not only to achieve the control target to quickly follow, At the same time can effectively solve the operating point changes brought DC voltage and current fluctuations.