基于条件触发的有源电力滤波器混合调制策略

Hybrid Modulation Scheme for Active Power Filter Based on Conditional Trigger Method

基于三相电压源变流器(VSC)的有源电力滤波器(APF)独立采用传统滞环调制或空间矢量脉冲宽度调制(SVPWM)进行电流跟踪时,难以同时保障稳态精度和动态响应性能。为解决此问题,提出一种基于条件触发的混合调制策略,通过分析滞环调制和SVPWM两种调制方式的工作原理,推导开关频率、环宽以及电流谐波总畸变率(THD)之间的关系,进而制定了两种调制方式的动态触发条件设计准则,简化了开关纹波滤波器设计,保证了动态响应速度和稳态精度。实验结果验证了所提混合调制策略的有效性和优越性。

Active power filter(APF)based on three-phase voltage source converter(VSC)independently adopts conventional hysteresis modulation or space vector pulse width modulation(SVPWM)to reallize current tracking cannot guarantee the steady-state accuracy and dynamic response performance at the same time.In order to solve this problem,a conditional triggered hybrid modulation strategy is proposed.By analyzing the working principle of hysteresis modulation and SVPWM,the relationship between switching frequency,hysteresis width and total harmonics distortion(THD)is deduced.Then,the design criteria of dynamic trigger conditions for two modulation modes are formulated,which simplifies the design of switching ripple filter and ensures the dynamic response speed and steady-state accuracy.Experimental results demonstrate the effectiveness and superiority of the proposed hybrid modulation strategy.