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在中高压大容量的工作环境下,有源电力滤波器(active power filter,APF)谐波抑制性能及产生的电磁干扰受到主电路功率半导体器件开关频率的制约。提出一种适用于中高压混合型并联有源电力滤波器的新型滑模控制方法。该方法对电网电流和APF直流母线中点电位进行解耦跟踪控制,并将对状态变量的跟踪控制和脉宽调制(pulse width modulation,PWM)统一起来,在相同的谐波抑制精度下,可实现对开关频率的优化,将其约束在较低的确定频带内。仿真和实验结果证明,该滑模控制方法可以有效抑制由电网电压畸变和非线性负载引起的谐波电流,同时具有电磁干扰小的优点。
Under the high-voltage and high-capacity working environment, the harmonic suppression performance of the active power filter (APF) and the generated electromagnetic interference are limited by the switching frequency of the main circuit power semiconductor device. A new sliding mode control method suitable for medium and high voltage hybrid parallel active power filter is proposed. The method decouples the grid current from the neutral point potential of the APF DC bus, and combines the tracking control of the state variables with the pulse width modulation (PWM). Under the same harmonic suppression accuracy, The optimization of the switching frequency is achieved, which is constrained within the lower defined frequency band. Simulation and experimental results show that the sliding mode control method can effectively restrain the harmonic current caused by grid voltage distortion and nonlinear load, meanwhile it has the advantage of small electromagnetic interference.