A New Control Method for Current-Source Inverter fed Motor Drive System Without Additional DC-link Current Regulator

With the rapid development of wide band-gap silicon carbide (SiC) devices, current-source-inverter (CSI) can minimize the bulky and heavy dc choke and has attracted more attentions for its advantages including output friendly waveforms, short circuit current tolerance ability and four-quant operation. Furthermore, CSI has an inherent ability to boost the output voltage which is suitable for motors to increase the speed without additional flux weakening control strategies. However, when the CSI works in the boost operation mode, the dc choke current will be uncontrolled without an active front end. In this paper, a new control method for CSI working in boost mode is proposed. With this method, the dc choke current and rotor speed can be controlled simultaneously. Both simulations and experimental results verify the effectiveness of the proposed method.