不平衡下电流源型PWM整流器无网侧电流传感器功率反馈控制策略*

doi:10.11985/2023.03.020

摘要/Abstract

摘要：

三相脉宽调制电流源型整流器在电网电压不平衡时，传统直接功率控制会导致功率脉动、直流侧输出低频波动和网侧电流畸变严重等问题，影响整流器性能。针对上述问题，提出一种无需采集网侧电流的改进型直接功率反馈控制策略，使得整流器在理想电网和不平衡电网下都能够获得良好性能。首先建立电流源型整流器在电网电压不平衡时的数学模型，推导出直流侧输出电流与网侧电流的关系表达式，然后在有功控制环中增加反馈控制直接抑制低频脉动，同时在调制环节中引入陷波器，以此减小网侧电流谐波。最后通过Matlab/Simulink仿真和试验样机测试，比较两种功率控制方案，验证了所提改进控制策略的正确性和优越性。

关键词: 电网不平衡, 功率控制, 陷波器, 反馈控制, 网侧电流传感器

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

中图分类号:

TM461

黄勇军, 郭强, 李山, 程福泉. 不平衡下电流源型PWM整流器无网侧电流传感器功率反馈控制策略^*[J]. 电气工程学报, 2023, 18(3): 184-195.

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.

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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