摘要
针对在不平衡或非线性负载条件下,普通的三相三桥臂逆变器无法产生三相对称电压,基于Simulink仿真平台,提出了三相四桥臂逆变器的新型闭环控制设计方案。此方案逆变器的前三桥臂采用空间矢量脉宽调制(SVPWM),第四桥臂采用跟踪前三相电流信号的电流滞环调制(CHBM),相对于传统的四桥臂一体化的SVPWM调制,控制系统设计简单,易于分析。仿真结果表明:与普通逆变器相比,采用本文控制方案的四桥臂逆变器输出的波形更加平滑,不仅增强了系统带不平衡负载的能力,而且改善了逆变系统的效率和总谐波失真(THD)。
In the unbalanced or non-linear load conditions, the ordinary three-phase three-leg inverter can not produce three- phase symmetrical voltage, based on the Simulink simulation platform, this paper presents a new closed-loop control design scheme for three-phase four-leg inverter. In this scheme, the first three arms of the inverter adopt space vector pulse width modulation （SVPWM）, the fourth bridge uses the current hysteresis loop modulation（CHBM） to track three-phase current signal. Compared with the traditional four-leg integrated SVPWM modulation, the control system is simple and easy to analyze. The simulation results show that compared with the ordinary inverter, the waveform of the four-leg inverter with the control scheme is smoother, which not only enhances the ability of the system with unbalanced load, but also improves the inverter system efficiency and total harmonic distortion （THD）.
出处
《电子技术应用》
2018年第2期127-130,134,共5页
Application of Electronic Technique
