Abstract:

In view of the active energy of motor feedback system, the current waveform and the energy conversion process of a motor in brake state were analyzed, and the mathematical model of the threephase voltagetype inverter grid was established in the synchronous rotating dq coordinate system, the
 independent control of the feedback current active component and reactive component grid was achieved with SVPWM direct current control algorithm, building experimental platform of motor energy feedback system in order to complete the resistive load experiments and feedback experiments of threephase gridconnected inverters. The experimental results show that bidirectional flowing of the energy is implemented with energy feedback, and the harmonics are suppressed effectively.

Key words: energy feedback, threephase grid inverter, control strategy