一种基于模式切换的静止无功补偿控制方法

Control Method for Static Reactive Power Compensator Based on Mode Switching

针对电网负载不平衡状态下功率因数的补偿问题,提出了一种基于模式切换的非线性PI无功补偿控制方法。首先,在电网无功补偿控制系统框架下,根据静止型无功补偿器的非线性特性,对非线性PI控制器的特征及实现方式进行了分析;其次,考虑在涉及负荷平衡与否状态下,系统需提供与之适应的控制器才能获取较好控制效果的需求,在负荷状态变化时进行控制器的切换,并进行了模式切换条件设计;在此基础上,分别以常规PI、传统非线性PI及基于模式切换的非线性PI为控制方式,进行电网无功补偿控制的比较与分析。仿真结果验证了所提控制方法的有效性。

As for the issue of power factor compensation under unbalance load of power grid,a kind of nonlinear PI reactive power compensation control method based on mode switching is proposed.Firstly,under the frame of reactive power compensation control system of the grid and in accordance with the nonlinear characteristics of static reactive power compensator,both feature and achievement method of the nonlinear PI controller is analyzed.Then,in view of the load balancing or not,the system needs applicable controller so to obtain better control effect.The controller is switched over variation of load condition,the design for the mode switch over is performed.On this basis,the comparison and analysis of reactive power compensation control of power grid is performed with conventional PI,traditional nonlinear PI and nonlinear PI based on mode switching as control method.And the effectiveness of the control method proposed is verified by the simulation result.