并联型APF直流侧电压的滑模PI控制策略研究

并联有源滤波器(shunt active power filter, SAPF)在主动配电网系统中应用日益广泛，提升SAPF的补偿性能成为众多学者关注和研究的热点。对直流侧电压精准稳定控制是保证SAPF补偿性能的关键。采用传统PI控制系统在非线性负载突变和电压跳变时无法对直流侧电压进行快速稳定控制，为改善直流侧电压的控制性能，提出电压外环滑模变结构PI复合控制器。仿真与实验结果表明:滑模PI复合控制器提高了直流电压控制的稳态精度和响应速度，降低了直流电压波动对SAPF补偿性能的影响。

PI control based on sliding mode variable structure of DC-link voltage for shunt active power filter

Duo to the shunt active power filter is widely used in the active power distribution system, more and more scholars aim to improve the compensation performance of the SAPF. The precise performance of the DC-link voltage is the key to ensure the SAPF be steady. Due to the bad performance of the output DC-link voltage based on the traditional PI controller, especially, under the load step-change and the reference voltage jump change, this paper presents an effective sliding mode variable structure control based PI control method in the voltage loop. At last, the simulations and experimental results show that the SMC based on PI scheme can improve the steady-state performance and transient response of the DC-link voltage, and reduce the bad affection of the DC-link voltage fluctuations. This work is supported by Science and Technology Project of China Southern Power Grid Co., Ltd. (No. GDKJXM00000015).