Position Estimation System for PMSM Position Sensorless Control in Inverter Overmodulation Drive

Abstract

This study investigates compensation methods for harmonic components to realize PMSM position sensorless control in inverter overmodulation drive. While applying PMSMs as traction motor motors in an EV or HEV, operating PMSM in inverter overmodulation drive is an effective method to widen high-speed drive region of PMSM and achieve fast torque response when voltage saturates because it enable to utilize 27% higher fundamental voltage as compared to linear drive. In addition, position sensorless control is regarded as an important technique for adding a fail-safe function and downsizing of the drive system. However, the harmonic components which are inevitably generated in inverter overmodulation drive have negative effects on closed current control and position estimation systems.The key to realize position sensorless control in inverter overmodulation drive is an appropriate compensation for the harmonic components in the input voltage and input current of a the position estimator. There are several methods to achieve this, and differences in position estimation performance possibly exist among these methods.In this study, the compensation methods for harmonic components in overmodulation drive are compared, and a suitable compensation method for sensorless control is investigated through an experiment.

Design of band elimination filter for PMSM vector control operable in overmodulation region of inverter

“…The main component of the harmonic components that are superimposed during overmodulation driving is the sixfold component of re (hereinafter, "6f component") on the d-q coordinate system. [8][9][10] Therefore, we will design a BEF that removes this 6f component. The transfer function of the BEF is expressed by Equation 1:…”

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15] Using the overmodulation region makes it possible improve the inverter output voltage up to about 27% compared to control methods that drive in the linear region, which results in improvements in the drive region and the torque response of the PMSM. As such, there have been many studies on control methods that utilize the overmodulation region where the output voltage of an inverter can be raised using the same power supply.…”

Analysis on Chaotic Mechanism of Direct-Drive Permanent Magnet Synchronous Generators Based on Lyapunov Stability Theory

“…The largescale wind turbines at home and abroad either use doubly-fed asynchronous generator (DFAG) or permanent magnet synchronous generator (PMSG). Compared with the DFAG [2,3], the PMSG [4,5] boasts a simple structure and a high efficiency, eliminating the need for rotor excitation or drawing draw reactive power from the grid.…”