面向电流源型PWM整流器的双矢量模型预测直接功率控制*

doi:10.11985/2024.01.023

摘要/Abstract

摘要：

电流源型脉宽调制(Pulse width modulation，PWM)整流器因其网侧存在LC滤波器，系统的控制难度增加。传统直接功率控制策略下的整流器功率波形存在脉动，因模型预测控制具有卓越的动态特性以及直观的控制规律，采用模型预测直接功率控制(Model predictive direct power control，MPDPC)对传统控制策略进行改进。首先建立了三相PWM整流器的数学模型，给出了每个采样周期内的功率变化率，并推导出相邻采样周期之间的功率关系，然后给出基于单矢量的模型预测直接功率控制策略，提出了基于双矢量的模型预测直接功率控制策略，并优选出两个电流矢量，计算在一个采样周期内的作用时间，并对其进行修正。最后，在Matlab/Simulink仿真软件验证了所提控制策略的可行性和有效性。

关键词: 电流源型整流器, 模型预测控制, 双矢量, 功率控制

Abstract:

Current source pulse width modulation(PWM) rectifier is difficult to control because of LC filter in its network side. The power waveform of rectifier based the traditional direct power control is pulsatile. Model predictive direct power control(MPDPC) is adopted to improve the traditional control strategy because of its excellent dynamic performances and intuitive control law. Firstly, the mathematical model of three-phase PWM rectifier is established, the power change rate in each sampling period is given, and the power relationship between adjacent sampling periods is derived. Then, single-vector-based model predictive direct power control strategy is given, and two-vectors-based model predictive direct power control strategy is proposed. The two current vectors are optimized, and the acting time in one sampling period is calculated and corrected. Finally, the feasibility and effectiveness of the proposed control strategy are verified by Matlab/Simulink.

Key words: Current source rectifier, model predictive control, two-vectors, power control

中图分类号:

TM46

王森, 杨奕, 郭强, 马雯, 黄勇军. 面向电流源型PWM整流器的双矢量模型预测直接功率控制^*[J]. 电气工程学报, 2024, 19(1): 216-225.

WANG Sen, YANG Yi, GUO Qiang, MA Wen, HUANG Yongjun. Two-vectors-based Model Prediction Direct Power Control of Current Source PWM Rectifier[J]. Journal of Electrical Engineering, 2024, 19(1): 216-225.

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参考文献 20

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三值逻辑函数 σ_aσ_bσ_c	调制系数		电流矢量序号I_z
三值逻辑函数 σ_aσ_bσ_c	m_rα	m_rβ	电流矢量序号I_z
1 0 -1	1	${\sqrt{\text{3}}}/{\text{3}}\;$	I₁
0 1 -1	0	${\text{2}\sqrt{\text{3}}}/{\text{3}}\;$	I₂
-1 1 0	-1	${\sqrt{\text{3}}}/{\text{3}}\;$	I₃
-1 0 1	-1	-${\text{2}\sqrt{\text{3}}}/{\text{3}}\;$	I₄
0 -1 1	0	-${\sqrt{\text{3}}}/{\text{3}}\;$	I₅
1 -1 0	1	-${\sqrt{\text{3}}}/{\text{3}}\;$	I₆
0 0 0	0	0	I₇
	0	0	I₈
	0	0	I₉

参数	数值
电网频率/Hz	50
电网电压有效值/V	220
直流侧输出电压/V	400
开关频率/kHz	16
滤波电感L_f/mH	0.5
滤波电容C_ac/μF	12
虚拟电阻R₃/Ω	5
直流侧电感L_dc/mH	4.5
直流侧电容C_dc/μF	120
负载R_L/Ω	20,40
控制器比例系数P	1.5
控制器比例系数I	200

参数变化	DPC	单矢量 MPDPC	双矢量 MPDPC
网侧有功功率纹波p_r/W	1 000	660	440
网侧无功功率纹波q_r/Var	1 200	600	420