Reverse matrix converter for permanent magnet synchronous motor drives using a direct power control

Abstract

This paper proposes a control method for a reverse matrix converter (RMC)-fed three-phase permanent magnet synchronous motor (PMSM). In this regard, a direct power control (DPC) is used as an additional control method. An indirect matrix converter (IMC) is an AC/AC power conversion system without dc-link energy storage elements such as capacitors or inductors. The IMC features full four-quadrant operation and sinusoidal input-output currents. In addition, the IMC has many advantages such as small size, low weight and durability. However, the IMC has a maximum voltage transfer ratio of 0.866. In this study, to increase the voltage transfer ratio, a boost-mode IMC is used to feed the PMSM. The boost mode IMC is called a RMC because the topology of the RMC reverses the input and output power flow of the IMC. Therefore, the RMC has a minimum voltage transfer ratio of 1/0.866. However, in case the system has a low-resistance load such as a motor in the output stage, the control of the PMSM is difficult without an additional control method. In other studies regarding the RMC, a high-resistance load is used for the output stage, which prevents the aforementioned problem. The effectiveness of the proposed control method using the RMC-fed PMSM is verified through simulation results.