论文部分内容阅读
针对广泛应用的整流类负荷的谐波治理,提出一种基于滑模控制的改进型直流(DC)侧串联型有源电力滤波器(APF)。这种DC侧APF与传统的DC侧APF相比,调压范围更广,且2个全控开关工作在同一频率下,控制和驱动电路得到简化。同时滑模控制是一种非线性控制方法,具有控制结构简单,对外界干扰鲁棒性强,且动态响应速度快等优点,已广泛用于电路结构随开关管状态变化的变换器中。该文将此控制用于该DC侧APF中,针对控制目标,建立了降阶的滑模面,并应用等效控制理论分析了滑模控制的存在和稳定条件。仿真结果证明了这种非线性控制具有较好的抗扰动能力和较快的反应速度,也证明了该理论分析的正确性。
Aimed at the harmonic control of widely used rectified loads, an improved DC-side series active power filter (APF) based on sliding mode control is proposed. Compared with the traditional DC side APF, the DC side APF has a wider voltage regulation range and the two full-control switches operate at the same frequency, and the control and drive circuits are simplified. At the same time, sliding mode control is a kind of nonlinear control method. It has the advantages of simple control structure, strong robustness against external interference, and fast dynamic response. It has been widely used in converters whose circuit structure changes with the state of the switch. In this paper, this control is applied to the APF in the DC side. For the control objective, a reduced-order sliding mode surface is established and the existence and stability of the sliding mode control are analyzed using the equivalent control theory. Simulation results show that this kind of nonlinear control has better anti-disturbance ability and faster response speed, and also proves the correctness of the theoretical analysis.