混合型有源电力滤波器双闭环控制

Dual-loop control of hybrid active power filter

混合型有源滤波器(HAPF)是一种改善电能质量的装置,针对其无源器件容易造成直流侧电压难以控制以及系统谐振的问题,提出一种变流器输出电流和电感电压反馈的双闭环控制器。首先建立变流器输出电压和无源支路上电感电压的数学模型,但模型中存在大量耦合项,为了实现无静差控制,采用变量前馈的解耦方式消除耦合量。然后对系统控制进行设计,电感电压作为外环保证跟踪精度;选用变流器输出电流作为内环,加入系统有源阻尼,抑制系统谐振尖峰。最后仿真和实验结果表明,该控制策略提高了直流侧电压控制的动态响应速度和稳态精度,同时降低了谐振尖峰对系统稳定性的影响。

Hybrid active power filter(HAPF)is a device to improve power quality.In order to solve the problem that passive devices in HAPF make it challenging to control the DC-side voltage and system resonance,a dual closed-loop controller with feedback of converter output current and inductor voltage is proposed.First,a mathematical model of the converter output voltage and the inductor voltage of the passive branch was established,but a large number of coupling terms existed in the model.In order to realize the static difference-free control,the decoupling method of variable feedforward was used to eliminate the coupling amount.Then the system control was designed,and the inductor voltage was used as the outer loop to ensure the tracking accuracy.The converter output current was selected as the inner loop,and the active damping was added to suppress the resonant peak of the system.Finally,the simulation and experimental results show that the control strategy improves the dynamic response speed and steady-state accuracy of the DC-side voltage,while reducing the impact of resonant spikes on system stability.