Harmonic current detection error elimination method for permanent magnet synchronous motor based on multiple reference systems

• Main Authors: SONG DONGRAN, DONG MI, XIE JINGHANG, WANG YAYING, ZHOU JINGYANG, YANG JIAN
• Format: Patent
• Language: Chinese; English
• Published: 19.12.2023
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention provides a multi-reference-system-based harmonic current detection error elimination method for a permanent magnet synchronous motor, and the method comprises the steps: measuring an electrical angle and a three-phase current of the permanent magnet synchronous motor, carrying out the transformation of the three-phase current through a multi-synchronous rotating coordinate system, and obtaining a detection current in a multi-reference system; measuring a fundamental current average value of the permanent magnet synchronous motor, and reconstructing a fundamental current component in the multiple reference systems in combination with the electrical angle; under a multiple reference system, subtracting the fundamental current component from the detection current to obtain a harmonic current containing twelfth harmonics; and for the harmonic current containing twelfth harmonics, a low-pass filter with an adaptive cut-off frequency is used for filtering to obtain a target harmonic current. According