基于恒压频比交直交无级变频调速方法研究

Research on the method of constant voltage frequency ratio and AC-DC-AC stepless variable frequency speed regulation

通过交直交变换电路,采用恒压频比原理起动三相异步电机,具体实现方案:用整流后带有六个波头的母线电压作为载波,先用恒压频比原理计算出逆变后所需任意整数频率的三相正弦调制波,再利用面积等效原理算出母线每个波头下对应的导通角,进而控制逆变电路中相应相全控开关管的导通和关断时刻,从而输出任意整数频率对应的三相正弦电压,进而实现异步电机从低速到高速的起动过程,最后通过matlab仿真进行试验验证.计算机仿真证明了此种方法的可行性和有效性.

This article through AC-DC-AC converter circuit, using the principle of constant voltage frequency ratio to start three-phase asynchronous motor . The concrete implementa-tion scheme： After rectiiiction, using the bus voltage with six wave head as the carrier. At iirst with constant voltage frequency ratio principle to calculate the arbitrary integer frequen-cy three-phase sine wave after contravariant as required,then using the corresponding equiva-lent area guide to calculate each bus wave head conduction angle, and then controlling the corresponding phase full controlled switch turn-on and turn off time in the inverter circuit , to output three-phase sinusoidal voltage corresponding to arbitrary integer frequency, thus implementation asynchronous motor starting from low speed to high speed, and finallythrough the matlab simulation experiment verifies it. The computer simulation proves the feasibility and effectiveness of the method.