基于dSPACE的单相并网逆变器控制策略研究

doi:10.16180/j.cnki.issn1007-7820.2023.03.010

摘要/Abstract

摘要：

针对电压畸变导致并网电流谐波含量较高的问题,文中提出准比例谐振控制与电压前馈相结合的控制策略。结合准比例谐振控制器在谐振频率处增益无穷大的特点,减小并网电流稳态误差,并引入电压前馈消除电压对系统影响,达到了改善并网电流质量的目的。文中分析了单相并网逆变器数学模型,通过闭环控制来抑制因电压畸变产生的并网电流谐波分量,同时采用控制变量法设定准比例谐振控制器参数,分析准比例谐振控制器参数对系统性能的影响。最后建立MATLAB/Simulink仿真模型并搭建dSPACE-DS1104半实物仿真平台,通过不同策略下的仿真与实验验证了所提策略的有效性。

关键词: 并网电流, 电压前馈, 闭环控制, 谐波分量, 准比例谐振, 零稳态误差, MATLAB/Simulink, 仿真分析

Abstract:

In view of the problem of high harmonic content of grid-connected current caused by voltage distortion, a control strategy combining quasi-proportional resonance control and voltage feed-forward is proposed in this study. Considering the infinite gain of the quasi-proportional resonance controller at the resonant frequency, the steady-state error of grid-connected current is reduced, and the voltage feed-forward is introduced to eliminate the influence of voltage on the system, so as to improve the quality of grid-connected current. The structure of single-phase grid-connected inverter is analyzed, the harmonic component of grid-connected current caused by voltage distortion is suppressed by closed-loop control, and the parameters of quasi-proportional resonance controller are set by control variable method, so as to analyze the influence of parameters of quasi-proportional resonance controller on system performance. Finally, the MATLAB/Simulink simulation model and the dSPACE-DS1104 hardware-in-the-loop simulation platform are established to verify the effectiveness of the proposed strategy under different strategies.

Key words: grid-connected current, voltage feed-forward, closed-loop control, harmonic component, quasi-proportional resonance, zero steady-state error, MATLAB/Simulink, simulation analysis

中图分类号:

TM464

夏梓豪,李玉东. 基于dSPACE的单相并网逆变器控制策略研究[J]. 电子科技, 2023, 36(3): 62-68.

XIA Zihao,LI Yudong. Research on Control Strategy of Single-Phase Grid-Connected Inverter Based on dSPACE[J]. Electronic Science and Technology, 2023, 36(3): 62-68.

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参数	数值	参数	数值
直流电压/V	70	采样频率/Hz	15 000
比例系数	0.5	谐振系数	60
直流侧电容/μF	400	截止频率/rad·s^-1	5
开关频率/Hz	5 000	逆变侧电感/mH	0.8
滤波电容/μF	600	网侧电感/mH	1.2