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中文摘要：
在分析基于电压源换流器的高压直流输电系统（VSC-HVDC）的非线性模型的基础上，运用非线性系统控制理论的状态反馈和坐标变换方法，将系统的非线性模型转化为完全能控的线性模型。再根据线性系统的最优控制理论得出了系统的最优控制规律。在此基础上设计了系统的非线性控制器。对所提出的非线性控制器和传统的PI控制器分别进行了计算机仿真研究。结果表明：在VSC-HVDC系统遭受扰动或故障后，所设计的非线性控制器比传统的PI控制器能更快更好地使系统恢复到正常状态，有效改善了系统的动态性能。
英文摘要：
This paper presented a nonlinear optimal control method for Voltage-Source-Converter （VSC） in HVDC light power transmission systems. First, the nonlinear dynamic model for the High Voltage Direct Current transmission systems based VSC was converted to a fully controllable linear model using state feedback and coordinate transformation in nonlinear system control theory. Then, a nonlinear optimal control strategy was derived, based on the optimal control theory of linear systems. Finally, a new nonlinear controller was designed for VSC-HVDC systems. The new nonlinear controller and classical PI controller were tested and compared by simulation. Simulation results have shown that the new nonlinear controller can restore the system, when subject to a disturbance or fault, to normal state faster and better than PI controller. It has effectively improved the dynamic performance of VSC-HVDC systems.
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