以网侧电流为补偿目标的有源电力滤波器预测电流控制

Predictive Current Control of Active Power Filter Aims Straightly to Compensate System Side Current

根据有源电力滤波器谐波和无功检测的不必要性的结论,提出了一种以网侧电流为直接补偿目标的APF预测电流控制新方法。首先建立了用于预测电流控制的APF离散化模型,然后根据网侧电流的下一采样时刻的预测值和目标函数挑选出下一时刻的电压矢量。该方法除了可消除采样、计算造成的延时外,还可以省略谐波检测电路及实现等效的PWM发生器,在一定程度上简化了控制电路的软硬件设计,还消除了谐波检测造成的延时,具有良好的暂态性能。仿真结果表明该预测电流控制方法具有良好的补偿性能。

Based on the conclusion that it is unnecessary to detect harmonic and reactive current in control system of active power filters （APF） , a new predictive current control method of APF which aims straightly to compensate system side current is proposed in this paper. Discrete model of APF is deduced, and voltage vector of next instant can be selected based on predictive system side current value of the next sampling instant and objec- tive function. It eliminates the delay caused by sampling and calculation, does not require harmonic current detection circuit and an equivalent PWM generator is achieved. The hardware and software design of control circuit can be simplified, the delay arose from harmonic current detection can also be eliminated, so the APF achieves good transient performance. The simulation results demonstrate that the method has good compensation capability.