输电系统三相逆变电源跟踪优化控制研究

摘要

In order to reduce the high harmonic content of output voltage for three-phase voltage type inverter power supply,the single frequency doubling polarity SPWM control mode is used,the coordinate transformation is introduced,a closed-loop control strategy with constant voltage and constant frequency for three-phase inverter power supply is proposed,and the single frequency doubling polarity SPWM modulation method is combined with a closed-loop feedback control method to realize automatic output voltage adjustment,the load phase voltage harmonic content is controlled below 1％.At the same time,the design of LC filter circuit can effectively reduce the loss and harmonic,and optimize the quality of the output voltage waveform.Finally Matlab/simlink simulation model is built for system simulation and harmonic analysis.The simulation results verify the effectiveness of inhibition under different load harmonics and the effect of waveform optimization,at the same time,the optimal modulation ratio can be determined.%针对三相电压型逆变电源系统输出电压谐波含量较高的问题,采用了单极性倍频SPWM控制方式,坐标变换的思想,提出了一种三相逆变电源恒压恒频闭环控制策略,并将单极性倍频SPWM调制方式与闭环反馈控制相结合的方法实现输出电压值自动调整,实现将负载相电压的谐波含量控制在1％以下.同时LC滤波电路的设计,能有效的减小损耗、减少谐波和优化输出电压波形质量.最后搭建Matlab/simlink仿真模型进行系统仿真和谐波分析,仿真结果验证了不同负载下抑制谐波的有效性以及优化波形的效果,同时确定最优调制比.