重复控制在模型预测直接功率控制中的应用

摘要

为了实现模型预测直接功率控制中对功率的准确跟踪,将重复控制应用在三相电压源型PWM整流器的模型预测中.在两相静止坐标系下,基于虚拟磁链定向,通过空间矢量脉宽调制实现开关频率的恒定.利用功率给定值与实测值的误差平方和最小构建目标函数,选出使系统运行于最优状态的控制电压矢量.通过重复控制将每一个控制周期的误差输入信号进行累加来反馈修正,从而实现功率实测值对功率参考值的准确无误跟踪,达到消除静差的目的.仿真和实验验证了该方法的可行性.%To accurately track the power in model predictive direct power control(MPDPC),repetitive control is ap?plied to the model prediction of three-phase voltage source PWM rectifier.Under a two-phase static coordinate system and based on virtual flux orientation,the switching frequency is kept constant by the space vector pulse width modula?tion(SVPWM).Cost function is established by the minimization of the sum of squared errors between model predictive power and measured power,thus the optimal voltage vector can be chosen. The input signal in every control cycle is modified by error signal which is constantly accumulated and fed back by repetitive control,which helps the measured power value accurately track the power reference value,and achieve the goal of eliminating static error.The feasibility of the improved method is validated by simulation and experimental results.