三电平有源电力滤波器死区效应分析与补偿

针对有源电力滤波器(APF)的死区效应问题,在三电平APF等效开关电路的基础上,从死区效应生成原理出发,结合三电平开关状态方程,推导出死区时间与电流跟踪误差之间的线性关系,阐释了死区时间带来的影响。提出了一种死区补偿方法,给出了补偿方法的控制原理图,并从控制系统的闭环特性角度分析了系统的性能。对比了无死区系统与死区补偿系统的性能,发现后者具有更好的稳态性能。通过仿真和实验结果表明所提方法能有效抑制死区效应。

Analysis and compensation of dead-time effect of three-level active power filter

In view of the dead-time effect of APF(Active Power Filter),the generation principle of the dead-time effect is analyzed on the basis of three-level switching state equations and three-level APF equivalent switching circuit. The linear relationship between the dead-time and the current tracking error is derived, and the effect of dead-time is illustrated. A dead-time compensation approach is proposed, and its control principle diagram is given. The performance of the system is analyzed in aspects of closed-loop characteristics. Comparisons between the system with and without dead-time compensation indicate that with dead-time compensation, the system has better steady state performance. Simulative and experimental results demonstrate that the proposed method can effectively suppress the dead-time effect.