从发电机转速、功率和直流母线电压之间的相互关系出发，提出利用直流母线电压进行转速观测实现无速度传感器。
According to the relationship of rotational speed, power and DC bus voltage, observing rotational speed by using DC bus voltage is proposed to realize none direct speed measurement.
文章还分析了电机制动时能量的回馈和直流侧母线电压的变化，以及直流电压变化对系统的影响。
The change of DC voltage in braking process and its effect on system and feedback energy are analyzed.
将这种过调制算法应用于永磁同步电机矢量控制系统中，提高了逆变器直流母线电压利用率，实现了对永磁同步电机弱磁运行区域的扩展。
The overmodulation algorithm is applied in the PMSM vector control system to increase output voltage of SVPWM inverter, and to extend the PMSM operation range.
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