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针对模型参数变化和噪声干扰的静止同步补偿器(STATCOM)单机无穷大系统,提出了一种基于灰色预测的无功电流控制。运用GM(1,1)模型预测下一时刻的无功电流,并根据STATCOM非线性数学模型建立了系统无功补偿电流的控制模型。从而将无功电流灰色预测控制补偿到PID控制中,利用来色系统理论进行预报,具有不必完全知道被控对象结构、参数和特性的优点,这对于像STATCOM这样大型非线性系统的预测控制实现非常有利。仿真结果表明,该方法比传统的PID控制具有更强的跟踪能力和鲁棒性。
In this paper, a reactive power control based on gray prediction is proposed for a stand-alone infinite system of static synchronous compensators (STATCOM) with variations of model parameters and noise. The GM (1,1) model is used to predict the reactive current at the next moment, and the control model of the system reactive power compensation current is established according to the STATCOM nonlinear mathematical model. Therefore, the gray predictive control of reactive current is compensated to the PID control, which is predicted by using the color system theory. It is not necessary to fully know the structure, parameters and characteristics of the controlled object. This is a new method for predictive control of large-scale nonlinear systems such as STATCOM Very advantageous. Simulation results show that this method has stronger tracking ability and robustness than the traditional PID control.