中文摘要：

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。

英文摘要：

A novel sliding mode control approach was presented for a medium-high voltage hybrid shunt active power filter （APF）, since the harmonics suppression effect of the filter was restricted by the switching frequency of power semiconductor devices, and electromagnetic interference （EMI） caused by the filter was also related with the switching frequency nearly. The proposed control approach combines state variables tracking with pulse width modulation （PWM）, in which source currents and the neutral point voltage of APF DC bus were decoupled and tracked simultaneously. With similar tracking accuracy, the switching frequency can be optimized and limited to a certain lower frequency band via the neutral point voltage control. The simulation and experiment results demonstrate that the proposed control strategy allows hybrid APF to eliminate harmonic currents caused by source voltage distorting and nonlinear loads effectively with low EMI.