Abstract
This paper proposes a capacitor voltage offset suppression method based on reference voltage self-correction for a three-phase four-switch (TPFS) inverter-fed permanent magnet synchronous motor (PMSM) drive system to improve the motor control performance. Firstly, the αβ-axis reference voltage deviation caused by capacitor voltage offset is analyzed, and the relationship between the voltage to be compensated and the offset is obtained. Then, the capacitor voltage offset is calculated according to the motor speed, rotor position, current vector amplitude, and capacitance on the capacitor bridge arm of the TPFS inverter. Finally, the reference voltage is corrected according to the voltage to be compensated and the capacitor voltage offset. This method is simple and easy to implement, and there is no need to add voltage sensors or filters in the system to extract the capacitor voltage offset, and there is no complex parameter adjustment. The effectiveness of the proposed method is verified by experiments on a 20 kW interior permanent magnet synchronous motor.
Highlights
Introduction to the Experimental PlatformInInorder ordertotoverify verifythe theeffectiveness effectivenessofofthe thecapacitor capacitorvoltage voltageoffset offsetsuppression suppressionstrategy strategy proposed in this paper, experimental verification was carried out on a kW interior permanent magnet synchronous motor (PMSM). proposedWorld Electr
The capacitor voltage offset suppression strategy proposed in this paper was applied to the three-phase four-switch (TPFS) inverter-fed PMSM drive system, and the experimental results were compared with those without any capacitor voltage offset suppression
The effectiveness of the proposed method was verified in terms of torque ripple of the motor, three-phase current of the motor, and capacitor voltage offset of the TPFS inverter
Summary
The TPFS inverter capacitor voltage offset leads to different offsets in the PMSM three-phase winding voltage. TPFS inverter capacitor voltagesystem offset as leads to different offsets in the PMSM αβ-axis stationary coordinate three-phase winding voltage. According to Equation (5), the(5), reference voltagevoltage uα is offset to due the capacitor voltagevoltage offset, which ing to Equation the reference uα is due offset to the capacitor offset, causes basic voltage vector ofvector the TPFS inverter shift along the along α-axis.the. The reference which the causes the basic voltage of the TPFS to inverter to shift α-axis. The voltages and u that generate the offset cannot be synthesized into the correct reference referenceuvoltages u α and u β that generate the offset cannot be synthesized into the correct α β voltage vector according the SVPWM strategy of the TPFS inverter. The α-axis coordinates of the basic voltage vector are shifted, compared with the capacitor voltage balance. The three-phase voltage asymmetry will inevitably lead to an asymmetry in the three-phase current, which affects the control performance of the motor
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