基于SVPWM控制策略的并网逆变器研究

Research of Grid Inverter Based on SVPWM Control Strategy

为解决逆变器并网谐波畸变率较大的问题,根据三相逆变器工作原理,构建了三相静止坐标系下的数学模型。利用三相逆变器的空间电压矢量调制技术,给出了交流侧电感参数选取原则,进而分析变压器二次侧不同连接方式以及直流偏磁对并网谐波畸变率的影响,并提出了改善方法。在Matlab/Simulink环境下对三相逆变器的空间矢量调制策略进行仿真验证,搭建基于DSP控制的三相逆变器实验样机,并进行了并网实验。实验和仿真结果表明,该补偿方法与控制策略是可行的。

In order to reduce the total harmonic distortion of grid inverter,the study establishes its mathematical model in the three-phase static coordinate system and studys the SVPWM modulation technology used in the three-phase inverter,according to the working principle of three-phase inverter.Also it gives the inductance parameter selection principle under this kind of control technology,analyzes the different connection of the transformer secondary side and DC magnetic biasing influence on total harmonic distortion,and the improved method is proposed.A three-phase inverter used SVPWM modulation strategy under the Matlab/Simulink environment is simulated,a three-phase inverter experimental prototype based on DSP control is built,and the grid experiment is carried out.The experimental and simulation results show the feasibility of the research methods and control strategies.