DC Voltage Stabilization Control Strategy of Converter Under Unbalanced Grid Voltage

doi:10.16628/j.cnki.2095-8188.2023.02.013

Abstract

Abstract:

Under the condition of unbalanced grid voltage,the DC bus voltage will occur the second harmonic wave when the converter works in the voltage stabilizing mode.In order to solve this problem,the mechanism of DC bus voltage second harmonic wave during voltage stabilization operation of converter under unbalanced power grid voltage is analyzed.The DC voltage stabilization control strategy based on the proportional integral resonance (PIR) controller is proposed.On the basis of the original DC voltage stabilization control strategy,the secondary proportional resonance (PR) control is added to solve the problem that the current technology can not completely avoid the second harmonic wave of the DC bus voltage.It is not necessary to separate the positive and negative sequence of the current and obtain the current command through complex calculation.Finally,the effectiveness of the proposed control strategy is verified by simulation and experiment.

Key words: unbalanced grid voltage, second harmonic wave, DC voltage control, secondary PR control

CLC Number:

TM46

LIU Chongyang, WEI Yalong, LIU Gang, FAN Shuhao, QI Zhao. DC Voltage Stabilization Control Strategy of Converter Under Unbalanced Grid Voltage[J]. LOW VOLTAGE APPARATUS, 2023, 0(2): 68-73.

Figures/Tables 10

References 13

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