基于空间电压矢量的全控开关软起动方法研究

Study Of Soft Start Based On Space Voltage Vector For Full Controlled Device

提出了一种基于全控器件的十二边形空间电压矢量软起动方法。将空间电压矢量的非零向量两两结合构成新的6个非零向量,再与原非零向量一起组成正十二边形空间电压矢量,采用交交变频的方法把工频进行13分频、7分频、4分频、1分频,利用Park变换,在这3个频率周期内依次进行正十二边形空间电压矢量起动,之后再通过调压的方法切换到工频。电路开关器件采用IGBT,因此可以实现有效的控制,并利用MATLAB软件搭建仿真电路对此方法进行了验证,计算机仿真证明了这种方法的可行性和有效性,性能参数较六边形法具有一定的提高。

The paper puts forward a method of dodecagon space voltage vector soft starting based on full controlled de- vice. The nonzeros vectors of space voltage vector, and together with the original nonzero vector constitute to a dodecagon space voltage vector. It used the method of AC frequency conversion to change the power frequency into 13 points, 7 points and 4 points frequency. By using the Park transform, the dodecagon space voltage vector was started orderly in the three frequency period. Then it switched to power frequency through the method of voltage regulation. Circuit switch devices a- dopt IGBT, so it can achieve effective control. Dodecagon is more close to circle than hexagon, so the method of dodecagon space voltage soft starting can starts asynchronous motor more stable than the method of hexagon space voltage vector soft starting in theory. Finally, the feasibility of this method was verified by MATLAB simulation circuit and got the more im- provements than hexagon space voltage vector.