Power Feedback Control Strategy of Current Source PWM Rectifier Without Grid Side Current Sensor under Unbalanced Grid Voltage

doi:10.11985/2023.03.020

Abstract

Abstract:

When the three-phase pulse width modulation current source rectifier operate under unbalanced grid voltage conditions, the traditional direct power control will cause power pulsation, low frequency output fluctuations on the DC side, and serious grid side current distortion, which will affect the performance of the rectifier. An improved power feedback control strategy that doesn’t need to collect grid side current is proposed, so that the rectifier can achieve good performance in both ideal and unbalanced grids. A mathematical model of the current source rectifier is firstly established when the grid voltage is unbalanced, and the expression of the relationship between the DC side output current and the grid side current is derived. Then feedback control is added in the active control loop to directly suppress low frequency pulsation, and at the same time a notch filter is introduced in the modulation link to reduce grid side current harmonics. Through Matlab/Simulink simulation and experimental prototype testing and comparing the two power control schemes, the correctness and superiority of the proposed method are verified.

Key words: Unbalanced grid voltage, power control, notch filter, feedback control, grid side current sensor

CLC Number:

TM461

HUANG Yongjun, GUO Qiang, LI Shan, CHENG Fuquan. Power Feedback Control Strategy of Current Source PWM Rectifier Without Grid Side Current Sensor under Unbalanced Grid Voltage[J]. Journal of Electrical Engineering, 2023, 18(3): 184-195.

Figures/Tables 25

References 26

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开关模式	导通器件	开关函数σ_aσ_bσ_c
1	S₁、D₁、S₆、D₆	1-10
2	S₃、D₃、S₄、D₄	-110
3	S₃、D₃、S₂、D₂	01-1
4	S₅、D₅、S₆、D₆	0-11
5	S₅、D₅、S₄、D₄	-101
6	S₁、D₁、S₂、D₂	10-1
7	S₁、D₁、S₄、D₄	000
8	S₃、D₃、S₆、D₆	000
9	S₅、D₅、S₂、D₂	000

开关函数σ_aσ_bσ_c	i_sa	i_sb	i_sc	开关函数σ_aσ_bσ_c	i_sa	i_sb	i_sc
1-10	i_dc	-i_dc	0	-101	-i_dc	0	i_dc
-110	-i_dc	i_dc	0	10-1	i_dc	0	-i_dc
01-1	0	i_dc	-i_dc	000	0	0	0
0-11	0	-i_dc	i_dc	—	—	—	—

导通开关	电流矢量	导通开关	电流矢量
S₁，D₁，S₂，D₂	I₁	S₆，D₆，S₁，D₁	I₆
S₂，D₂，S₃，D₃	I₂	S₁，D₁，S₄，D₄	I₀(I₇)
S₃，D₃，S₄，D₄	I₃	S₃，D₃，S₆，D₆	I₀(I₈)
S₄，D₄，S₅，D₅	I₄	S₅，D₅，S₂，D₂	I₀(I₉)
S₅，D₅，S₆，D₆	I₅

参数	数值	参数	数值
电网频率f/Hz	50	直流侧电容C_dc/μF	100
交流侧电感L_ac/mH	0.45	负载电阻R_L/Ω	5.6
交流侧电容C_ac/μF	12	开关频率f_k/kHz	20
直流侧电感L_dc/mH	5	采样频率f_c/kHz	20