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虚拟阻抗的无电压传感器并网逆变器控制
引用本文:艾永乐,潘智航,杜明珠,李港星. 虚拟阻抗的无电压传感器并网逆变器控制[J]. 重庆大学学报(自然科学版), 2022, 45(11): 80-90
作者姓名:艾永乐  潘智航  杜明珠  李港星
作者单位:河南理工大学电工电子实验中心,河南 焦作 454150;河南理工大学电气工程与自动化学院,河南 焦作 454150
基金项目:河南省教育厅高等学校重点科研项目(17A470001);河南省科技攻关项目(172102310569)。
摘    要:接口阻抗可以滤除谐波,但接口阻抗和电压传感器会增加系统的体积、功率损耗以及复杂性。针对上述问题,提出了基于虚拟阻抗的无电压传感器控制方案,来实现逆变器并网。文章对逆变器系统模型和虚拟阻抗的实现原理进行了阐述,提出了一种基于虚拟阻抗的控制方法,以实现无接口阻抗和无交流电压传感器控制,在启动时使用电流传感器同步,为了降低系统的复杂性,只使用虚拟电阻进行自同步的方法。通过将Matlab/simulink仿真和实验对结果进行了对比,验证了这些方法的稳定性和动态特性。

关 键 词:并网逆变器  无电压传感器  虚拟阻抗
收稿时间:2021-01-26

Control of grid-connected inverter without voltage sensor based on virtual impedance
AI Yongle,PAN Zhihang,DU Mingzhu,LI Gangxing. Control of grid-connected inverter without voltage sensor based on virtual impedance[J]. Journal of Chongqing University(Natural Science Edition), 2022, 45(11): 80-90
Authors:AI Yongle  PAN Zhihang  DU Mingzhu  LI Gangxing
Affiliation:Electrical and Electronic Experiment Center, Henan Polytechnic University, Jiaozuo 454150, Henan, P. R. China;School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454150, Henan, P. R. China
Abstract:The interface impedance can filter out harmonics, but interface impedance and voltage sensors increase the size, power loss, and complexity of the system. To solve these problems, a virtual impedance-based voltage sensor-free control scheme is proposed to have the inverter grid-connected. The inverter model and the principle of virtual impedance implementation are elaborated, and a virtual impedance-based control method is proposed to achieve interface impedance-free and AC voltage-sensor-free control. In addition, a method is proposed to use current sensor synchronization at startup. To reduce the complexity of the system, only virtual resistors are used for self-synchronization. The stability and dynamic characteristics of the proposed methods were verified by comparing Matlab/simulink simulations with experimental results.
Keywords:grid-connected inverter  voltage-sensor-free  virtual impedance
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