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研究静止同步补偿器(STATCOM)内部电流的跟踪控制问题。建立STATCOM的数学模型,通过外部电压环来设计参考电流信号,从而得到STATCOM的电流跟踪偏差模型。采用直接反馈线性化和Lyapunov函数的方法,设计H∞控制器,使得内部电流达到快速跟踪参考信号的目的,并且具有抑制外部干扰的性能。最后,通过Simulink仿真与传统两级PI控制进行比较,结果表明了所提算法对STATCOM具有更好的内部控制性能。
The problem of tracking control of STATCOM internal current is studied. The mathematical model of STATCOM is established, and the reference current signal is designed by external voltage loop, so the current tracking deviation model of STATCOM is obtained. Using direct feedback linearization and Lyapunov function method, the H∞ controller is designed so that the internal current can achieve the purpose of fast tracking reference signal and has the property of suppressing external interference. Finally, compared with the traditional two-stage PI control through Simulink simulation, the results show that the proposed algorithm has better internal control performance for STATCOM.