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提出一种统一定点坐标变换和基于该变换的有源电力滤波器零稳态误差电流控制方法。统一定点坐标变换可以将静止a-b-c坐标系下含多个频率正弦分量的三相电流指令一次变换为统一定点δ-ξ坐标系下的恒直流指令,处于静止a-b-c坐标系和统一定点δ-ξ坐标系下的有源电力滤波器状态空间平均模型是不同的,后者比前者多了一个包含自干扰和耦合干扰的干扰项。为实现零稳态误差跟踪谐波电流指令,在统一定点δ-ξ坐标系下不仅需要采用PI控制器和系统电压前馈控制,还需进行自干扰和耦合干扰前馈以克服这两类干扰对输出的影响。仿真实验表明:提出的电流控制方法可实现零稳态误差跟踪谐波电流指令,且动态特性良好。
A uniform fixed-point coordinate transformation and a zero-steady-state error current control method of active power filter based on the transformation are proposed. The unified fixed-point coordinate transformation can convert the three-phase current command with multiple sinusoidal components in the static abc coordinate system into a constant DC command under the unified fixed-point δ-ξ coordinate system at the static abc coordinate system and the unified fixed-point δ-ξ coordinate The state space averaging model of the active power filter is different from the former, and the latter has more interference terms than the former one, which includes self-interference and coupled interference. In order to realize zero-steady-state error tracking harmonic current command, PI controllers and system voltage feed-forward control are needed under the unified δ-ξ coordinate system. Self-interference and coupled interference feed-forward are also needed to overcome these two types of interference Impact on output. Simulation results show that the proposed current control method can realize zero-steady-state error tracking harmonic current command with good dynamic characteristics.