Shizunori Hamada

Independent Control of Input Current, Output Voltage, and Capacitor Voltage Balancing for a Modular Matrix Converter

This paper presents a novel control scheme for the modular matrix converter (MMxC), in terms of balancing capacitor voltages in addition to controlling output voltage and input current along with a comprehensive mathematical model. The proposed technique has been designed based on a fully decoupled current control of the positive-, negative-, and zero-sequence components of each MMxC subconverter in addition to the feedforward instantaneous power control to suppress the capacitor voltages fluctuation. The frequency of the zero-sequence is the output frequency for the load. Therefore, the positive-sequence current component is used to control the input current to achieve unity input power factor, the negative-sequence current component is used to balance the capacitor voltages among all MMxC arms, and the zero-sequence current component is used to control the output voltage. The effectiveness of the proposed control scheme for controlling the MMxC has been verified theoretically, using simulation software, and experimentally, using a laboratory prototype based 3 kVA, 200 V.

Independent control of input current, load and capacitor voltage balancing for a modular matrix converter

This paper presents a novel control method for controlling the Modular Matrix Converter (MMxC) in order to achieve balanced capacitor voltages in addition to load voltage and input current control. The proposed control technique has been designed based on independent current control of positive-, negative- and zero-sequence in addition to feed forward power control. The positive-sequence circuit is used to control the input current, the negative-sequence circuit is used to balance the capacitor voltage among MMxC arms and the zero-sequence circuit is used to control the load control. Feed forward power control is used to suppress the capacitor voltage fluctuation. The effectiveness of the proposed control scheme for the MMxC has been verified theoretically using simulation software and experimentally using 4kVA-200V laboratory prototype.

Torque control of IPMSM to avoid voltage saturation

This paper presents the current control for the vibration torque reference of an Interior Permanent Magnetic Synchronous Motor (IPMSM) to avoid output voltage saturation of the inverter under the reduction of copper losses. The current control point for the constant component of the torque reference is determined from the references of the speed and constant torque to avoid the voltage saturation. The current reference during the period of the torque vibration is derived on the control point. The effectiveness of the proposed method has been verified by experiments.