基于空间电压矢量的软起动器变频阶段的优化及仿真

对于空间电压矢量软起动器变频阶段的负相转矩和转速振荡问题,依据电压矢量的控制方法,对频率转换点的选取实行优化。以电机负载状况来获取各个变频阶段的控制角初始值,以恒压频比原则获取控制角终值,以此对软起动器变频阶段的控制进行优化。最后对优化后的软起动器进行仿真验证,结果显示,软起动器工作在变频阶段时,在频率转换点出现的转速超调得到了改善,电流峰值有所减小,没有负转矩出现。

Optimization and Simulation of Frequency Conversion Phase of Soft Starter Based on Space Voltage Vector

For the negative phase torque and rotational speed oscillation problems in the frequency conversion stage of the space voltage vector soft starter, the selection of the frequency conversion point was optimized according to the control method of the voltage vector. The initial value of the control angle of each frequency conversion stage was obtained with the motor load status, and the final value of the control angle was obtained with the constant voltagefrequency ratio principle, so as to optimize the control of the frequency conversion stage of the soft starter. Finally, the optimized soft starter was verified by simulation. The results showed that, when the soft starter was operating in the frequency conversion phase, the overshoot of the speed at the frequency conversion point was ameliorated, the current peak value was reduced, and no negative torque appeared.