基于虚拟阻抗的无电压传感器的并网逆变器控制
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河南理工大学

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河南省教育厅高等学校重点科研项目


Virtual impedance-based control of grid-connected inverters without voltage sensors
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Henan Polytechnic University

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Key Research Projects of Higher Education Institutions of Henan Provincial Education Department

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    摘要:

    接口阻抗可以滤除谐波,为逆变器同步提供电压传感点。但是,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。首先,对逆变器的控制系统进行了分析。其次,对虚拟阻抗的实现原理进行了叙述,提出了用虚拟阻抗代替接口阻抗以及移除用于同步的交流电压传感器的方法,并对其进行了详细的研究,同时提出了一种在启动时使用电流传感器进行同步的方法。然后,为了降低系统的复杂性,提出了只使用虚拟电阻进行自同步的方法。最后,进行了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。

    Abstract:

    The interface impedance filters out harmonics and provides a voltage sensing point for inverter synchronization. However, interface impedance and voltage sensors increase the size, power loss, and complexity of the system. To address these problems, a virtual impedance-based voltage sensor-free control scheme is proposed to implement the inverter grid-connected. Firstly, the control system of the inverter is analyzed. Secondly, the principle of virtual impedance implementation is described, and the method of replacing the interface impedance with virtual impedance and removing the AC voltage sensor used for synchronization is proposed and investigated in detail, and a method of synchronization using a current sensor at startup is proposed. Then, to reduce the complexity of the system, a method of self-synchronization using only virtual resistors is proposed. Finally, Matlab/simulink simulations and experiments were performed to compare the results and verify the stability and dynamic characteristics of these methods.

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  • 收稿日期:2021-01-22
  • 最后修改日期:2021-04-26
  • 录用日期:2021-04-26
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