基于随机脉冲位置的无死区空间电压矢量脉宽调制策略研究

Study on Non-dead-zone Space Vector Pulse Width Modulation Strategy Based on Randomized Pulse Position

有源滤波器能否按其工作原理实现预期的谐波抑制效果,在很大程度上还依赖于对电压源型逆变器所采用的空间电压矢量脉宽调制(SVPWM)策略。为此,以一种新型注入式混合有源滤波器为例,将基于随机脉冲位置的SVPWM策略与无死区控制策略相结合,提出一种基于随机脉冲位置的无死区SVPWM策略,综合实现抑制电磁噪声、降低开关损耗、提高直流侧电压利用率和补偿死区效应的目的。仿真结果验证了该调制策略的有效性。

Whether the active filter could get desirable effects of harmonic suppression in the power network mainly depends on the space vector pulse width modulation （SVPWM） strategy of the voltage source inverter （VSI）. Taking a new injection type hybrid active filter as an example, this paper combines SVPWM strategy based on randomized pulse position and non- dead-zone control strategy, and brings forward a new SVPWM strategy, thus comprehensively enabling electromagnetic noise suppression, switching loss reduction, DC-side voltage utilance enhancement and dead zone effect compensation. Simulation results all verify the effectiveness of the proposed strategy.