基于智能功率模块(IPM)或功率集成模块(PIM)的三相电压源整流器( VSR)为一种高集成的PWM整流器,但是模块成本高,支持开关频率低,导致附加成本较高.采用网压定向的矢量控制策略,设计和实现了变频空调用三相电压源整流器,包括以下几个方面内容:①采用6只分立逆导开关,构成三相H桥;②采用下三管发射极串联三只分流电阻,通过测量分流电阻压降,重构三相网流;③采用分压和隔离电路获得电网线电压极性,通过开环锁相得到电网电压相位.试验结果表明,上述三相整流器的整体技术合理,性能良好,成本低廉,可以作为整流器备选方案.
The three-phase voltage source rectifier (VSR) based on the intelligent power module (IPM) or power integrated module (PIM), as a highly integrated PWM rectifier, has a high cost and supports low switching frequencies, resulting in a high additional cost. A net voltage oriented vector control strategy was adopted to design and realize a three-phase voltage source rectifier for the variable frequency air-conditioner. Following steps were adopted:①Six discrete reverse-conducting switches were used to make up a three-phase H-bridge;② Three shunt resistors were connected in series by means of the emitters of the three lower tubes to reconstruct the three-phase network flow through measurement of voltage drop of the shunt resistor; ③ Voltage polarity of the power grid line was obtained through the voltage division and separation circuit, and voltage phase of the grid was obtained through the open-loop lock. Experimental results indicated that the proposed three-phase rectifier was a reasonable technology, had good performance and low cost, and could serve as an alternative rectifier.