五相逆變器之最佳零序注入調變法則

Five-Phase Modulator with Optimal Zero-Sequence Injection

陳鏗元 ； 彭文陽 ； 魏志綸 ； 陳龍德

《機械工業雜誌》 422期 (2018/05) Pp. 31-40

摘要

五相逆變器可應用於工業中五相馬達變速驅動，空間向量脈寬調變及不連續脈寬調變為兩種常見之逆變器調變方法，對於三相逆變器，大家已經熟知不連續調變較適合大調變參數時之驅動，而小調變參數時則為空間向量調變較好，然而對於五相逆變器，並沒有一個可依循的方法提供此兩調變器之抉擇，因此本文針對不同的調變參數及參考訊號之相位角，發展一調變器決擇方法，首先推導調變器失真參數數學模型，此參數正比於電流失真度，接下來於每一載波週期內，計算兩調變器之失真參數有效值，並採用較低失真參數之調變器，得到一低電流失真之調變法。

關鍵字

脈波寬度調變 ； 零序列注入 ； 五相逆變器

並列摘要

Five-phase voltage source inverter drives have recently been applied to various industrial applications for variable speed motor drives. Both space-vector PWM (SVPWM) and discontinuous PWM (DPWM) are commonly used modulators. Under the three-phase setting, it is well known that SVPWM is preferred for small modulation indices whereas DPWM is better for large modulation indices. However little detailed discussions on five-phase setting are reported. This paper developed a method to select either SVPWM or DPWM under different reference amplitudes and angles. Firstly, a generalized expression of PWM harmonic flux which is proportional to current distortion is derived. Secondly, by selecting the modulator that corresponds to minimum rms harmonic flux for every carrier period, optimal injection pulse-width modulation (OIPWM) is constructed.

並列關鍵字

Pulse-width modulation ； Zero-sequence injection ； Five-phase inverter