三相并网逆变器改进定频模型预测电流控制  

Model Predictive Current Control with Improved Fixed-frequency for Three-phase Grid-connected Inverter

作　　者：任志玲[1] 叶俊 王继超 REN Zhiling;YE Jun;WANG Jichao(School of Electrical and Control Engineering,Liaoning Technical University,Huludao 125105,China)

机构地区：[1]辽宁工程技术大学电气与控制工程学院,葫芦岛125105

出　　处：《电源学报》2023年第4期88-96,共9页Journal of Power Supply

基　　金：辽宁省高等学校国(境)外培养资助项目(2019GJ WZD002);辽宁省教育厅科研项目(LJKE0332)。

摘　　要：三相并网逆变器传统模型预测控制存在开关频率不固定和输出电流谐波含量较高的问题,给并网逆变器输出滤波器的设计带来了一定困难,并且影响并网逆变器的运行效率。为此,提出一种三相并网逆变器改进定频模型预测电流控制算法,在每个控制周期采用3个电压矢量,通过αβ轴电流无差拍控制来确定每个电压矢量的作用时间,以电流跟踪误差最小选择最优电压矢量组合,再经过离散化PWM0 DPWM0(discontinuous pulse width modulation zero)调制得到开关信号,实现输出电流定频控制且谐波含量降低。仿真和实验结果验证了所提算法的可行性和有效性。The traditional model predictive control for three-phase grid-connected inverters has problems of unfixed switching frequency and high harmonic content of output current,which brings certain difficulties to the output filter design of grid-connected inverters and affects their operation efficiency.In this context,a model predictive current control algorithm with improved fixed-frequency for a three-phase grid-connected inverter is proposed.Three voltage vectors are adopted in each control cycle,and the action time of each voltage vector is determined through the current dead-beat control of αβ axis,thus selecting the optimal combination of voltage vectors that has the minimum current tracking error.Then,the switch signals are obtained by discontinuous pulse width modulation zero(DPWM0) modulation to realize the output current fixed-frequency control and reduce the harmonic content.Simulation and experimental results verified the feasibility and effectiveness of the proposed algorithm.

关 键 词：三相并网逆变器 模型预测控制 电压矢量 定频控制 

分 类 号：TM464[电气工程—电器]