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静止同步补偿器(STATCOM)是柔性交流输电系统(FACTS)的重要组成部件,本文建立了静止同步补偿器在三相静止坐标系下的数学模型,通过PARK变换将ABC坐标转化为d-q坐标。鉴于STATCOM在d-q坐标下的强耦合性,采用状态反馈精确线性化方法将该模型线性化解耦,构造出一个伪线性模型。然后,采用一种改进的指数趋近律变结构控进行了STATCOM无功补偿控制器的设计。最后,使用Matlab/Simulink对所设计的控制器进行了计算机仿真,并与传统的PI控制器比较,说明了变结构控制的STATCOM无功补偿控制器设计的可行性和有效性,同时也证明了改进的指数趋近律变结构控制的优越性。
Static synchronous compensator (STATCOM) is an important part of FACTS. In this paper, a mathematical model of static synchronous compensator in three-phase stationary coordinate system is established. By using PARK transform, ABC coordinate is transformed into d-q coordinate. In view of the strong coupling of STATCOM under d-q coordinates, the model is linearly decoupled by the state feedback precise linearization method to construct a pseudo-linear model. Then, the design of STATCOM reactive power compensation controller is carried out by adopting an improved exponential approach to the law of variable structure control. Finally, the simulation of the designed controller is done by using Matlab / Simulink. Compared with the traditional PI controller, the feasibility and effectiveness of STATCOM reactive power compensation controller design for variable structure control are demonstrated. At the same time, The improved index approaches the superiority of the law-variable structure control.