SVG滑模控制策略及处理器在环测试研究

Research on SVG Sliding Mode Control Strategy and Processor in the Loop Test

当静止无功发生器(Static var generator,SVG)电压外环使用传统PI控制时,存在直流侧电容电压动态响应较差、参数设计较为复杂等问题。针对这些问题,采用了基于滑模变结构的控制策略。该控制策略以dq旋转坐标系下的数学模型为基础进行研究,电流内环采用PI解耦控制,电压外环采用滑模变结构控制。运用处理器在环测试(Processor in loop,PIL)将控制策略模型置于代码层面进行验证,结果证明:在电流内环参数相同的条件下,滑模变结构控制相较于传统PI控制,提高了直流侧电容电压的动态响应速率,并且避免了SVG在启动阶段出现电网侧功率因数过低的情况。

When the static var generator(SVG)voltage outer loop uses traditional PI control,there are problems such as poor dynamic response of the DC side capacitor voltage and complex parameter design.To solve these problems,a control strategy based on sliding mode variable structure is adopted.The control strategy is based on the mathematical model in the dq rotating coordinate system.The current inner loop adopts PI decoupling control,and the voltage outer loop adopts sliding mode variable structure control.The processor in loop(PIL)test is used to place the control strategy model at the code level for verification.The result proves that the sliding mode variable structure control is better than the traditional PI control under the same conditions of the current inner loop parameters.The dynamic response rate of the capacitor voltage on the DC side is improved,and the situation that the power factor of the grid side of the SVG is too low during the start-up phase is avoided.