不平衡电网下Y源双级矩阵变换器的无源滑模控制策略

Passivity-based Sliding-mode Control Strategy Based on Y-source Two-stage Matrix Converter Under Unbalanced Powr Grid

针对双级矩阵变换器电压传输比低的缺点,在直流部分嵌入Y源网络,组建了Y源双级矩阵变换器(Y-source two-stage matrix converter,YSTSMC),其具有电压增益大、无源元件少、开关损耗低等特点。当电网电压产生不平衡工况时,系统会出现较大的波动进而影响功率因数和电能质量,降低了系统运行的可靠性。为了完善不平衡电网电压下YSTSMC变换器的输入控制,对YSTSMC变换器的输入功率控制进行了研究,传统PI控制器存在参数调节比较困难、控制精度不高、超调量较大和抗干扰能力不强等问题,为此提出了不平衡电网电压下基于无源滑模控制(passivity based control-sliding mode control,PBC-SMC)的YSTSMC控制系统,并证明其稳定性。仿真和实验的结果表明,基于无源和滑模理论基础的PBC-SMC控制策略可以使系统的响应速度和电能质量得到提高。

Aiming at the shortcomings of the low-voltage transfer ratio of the two-stage matrix converter,the Y-source two-stage matrix converter(YSTSMC)is formed by embedding the Y-source network in the DC part,which has the characteristics of large voltage gain,few passive components,and low switching loss.If the grid voltage creates an un-balanced condition,the current and voltage will fluctuate greatly,affecting the power factor and power quality and reducing the reliability of system operation.In this paper,the input power control of the YSTSMC converter is studied for improvement of the input control of the YSTSMC converter.The traditional PI controller has the problems of relatively difficult parameter adjustment,low control accuracy,large overshooting amount,and poor anti-interference ability.Therefor,the YSTSMC control system based on the passivity based control-sliding mode control(PBC-SMC)under un-balanced grid condition is proposed,and its stability is proved.Simulation and experimental results show that the PBC-SMC control strategy based on passive and sliding mode theoretical foundations can lead to improved system responsiveness and power quality.