STATCOM的内部电流非线性H∞跟踪控制

Internal Current Non-linear H∞ Tracking Control of STATCOM

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 internal current control in Static Synchronous Compensator（STATCOM） is studied. A mathematical model of STATCOM is obtained, and the reference signal of the current is designed by using external voltage loop to get the tracking error model of STATCOM. Based on the direct feedback linearization and Lyapunov function method, an H∞ controller is designed, which can guarantee that the power system is stable. The proposed method can make the internal current track the reference signal very fast and has the performance of disturbance attenuation. Finally, a simulation example is given to show that the proposed control method has the better control performance for STATCOM compared with the conventional two-level PI controller.