改进比例-积分-微分控制方法在无功补偿和混合滤波综合补偿系统中的应用

设计了一种兼有无功补偿和混合滤波功能的综合补偿系统。由于传统比例-积分-微分控制方法对上述系统的检测精度、计算延时和被控对象状态变化具有较强的依赖性，文中将增量递推预测模型预作用于上述系统以补偿延时带来的控制误差，提出了一种采用预测模型实现的多模比例-积分-微分控制方法，使得当电网状态变化时该补偿系统可自动在比例-积分和比例-微分模型间切换。仿真结果和实际运行情况表明该补偿系统具有控制精度高、鲁棒性强等特点，验证了该控制方法的正确性和有效性。

Application of Improved Proportional Integral Differential Control Method in Synthetic Compensation System with Reactive Power Compensation and Hybrid Active Power Filter

A synthetic compensation system in which the reactive power compensation and hybrid active power filter are combined with is proposed. Due to the dependence of traditional proportional integral differential control strategy upon the detection accuracy, time-delay caused by computation and state change of the controlled objects of the proposed compensation system, the authors pre-act the increment recursive forecasting model to the proposed system to compensate the control error brought by time-delay, and put forward a multi-mode PID control approach, which is implemented by use of forecasting model, to make automatic switching-over of the proposed system between PI and PD models while the state of power system changes. The correctness and effectiveness of the proposed system are validated by simulation and actual operation, and the results of simulation and actual operation show that the proposed system possesses the advantages of high control accuracy and strong robustness.