Control of grid-connected inverter without voltage sensor based on virtual impedance

doi:10.11835/j.issn.1000-582X.2021.208

Home > Archive>Volume 45, Issue 11, 2022 >80-90. DOI:10.11835/j.issn.1000-582X.2021.208

Control of grid-connected inverter without voltage sensor based on virtual impedance
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                        10.11835/j.issn.1000-582X.2021.208
                    
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                        AI YongleAI Yongle
Electrical and Electronic Experiment Center, Henan Polytechnic University, Jiaozuo 454150, Henan, P. R. China
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PAN ZhihangPAN Zhihang
School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454150, Henan, P. R. China
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DU MingzhuDU Mingzhu
School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454150, Henan, P. R. China
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LI GangxingLI Gangxing
School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454150, Henan, P. R. China
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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.

Key words:grid-connected inverter;voltage-sensor-free;virtual impedance

Reference

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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,2022,45(11):80~90

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Received:January 26,2021
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Online: December 01,2022
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