静止无功发生器的预测电流控制方法

为实现静止无功发生器SVG(Static Var Generator)良好的控制性能,从SVG的工作机理动态性能出发,引入逻辑开关函数建立SVC的动态数学模型,在该模型基础上提出了一种预测电流控制的方案。该控制方法是利用当前采样时刻的状态信息,预测下一个采样周期补偿电流的轨迹,计算出逆变器输出的电压参考值,将其作为空间矢量PWM调制的输入,确定开关函数,产生与参考值相当的电压,最终达到预测补偿的目的。Matlab仿真结果表明:该控制方法对预测补偿SVG的无功电流具有有效性和可行性。

Predictive current control method of static var generator

According to the working mechanism and dynamic performance of SVG(Static Var Gene- rator),a predictive current control method is proposed to realize the perfect control,which is based on its dynamic mathematic model built up with logic switch function.It predicts the compensating current trajectory of next sampling period by the sampled information of present period,and then calculates the reference voltage of inverter output,which is used as the input of space vector PWM to set the switching function.The generated voltage is equivalent to the reference voltage and the predictive compensation is thus achieved.Simulation results with Matlab show its effectiveness and feasibility.