计及电网和线路阻抗的并联逆变器谐振抑制方法
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作者单位:

1.南京工程学院;2.国网浙江省电力有限公司绍兴供电公司

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TM464

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国家自然基金项目(61901212)


Resonance suppression method for parallel inverters considering grid and line impedance
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Affiliation:

1.Nanjing Institute of Technology;2.Shaoxing Power Supply Company, State Grid Zhejiang Electrical Power Co. , Ltd

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    摘要:

    在弱电网条件下,由于并联逆变器之间以及逆变器与电网之间的耦合作用,系统会产生谐振;同时,实际系统中的电网阻抗以及逆变器到并网点处的线路阻抗又会导致谐振点发生偏移,加剧系统谐振失稳。首先以单台并网逆变器为基础,建立了考虑电网阻抗和线路阻抗的多逆变器并联数学模型,通过探讨弱网下并联系统的谐振形成机理以及分析电网阻抗和线路阻抗对系统谐振产生的影响,研究了一种进网电流全前馈与PCC点并联虚拟导纳相结合的谐振抑制方法。在Simulink中搭建三台基于LCL滤波器的T型三电平逆变器并联系统仿真模型,仿真结果表明该方法可以有效抑制LCL型并网逆变器的自身固有谐振以及弱电网引发的谐振,同时还可以有效提高系统稳定性,增强多机并联系统对线路阻抗和电网阻抗变化的鲁棒性。

    Abstract:

    Under the condition of weak grid, due to the coupling effect between parallel inverters and between inverters and power grid, the system will produce resonance problem. At the same time, the grid impedance in the actual system and the line impedance from the inverter to the parallel point will make the resonance point deviate and aggravate the resonance instability of the system. Firstly, based on a single grid connected inverter, this paper establishes a mathematical model of multi inverter parallel connection considering grid impedance and line impedance, A resonance suppression strategy based on full feed-forward current and PCC point parallel virtual admittance is studied. The simulation model of three parallel T-type three-level inverters based on LCL filter is built in Simulink. The simulation results show that the strategy can effectively suppress the inherent resonance of LCL type grid connected inverter and the resonance caused by weak current grid, improve the system stability and enhance the robustness of multi machine parallel system to the changes of line impedance and grid impedance.

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历史
  • 收稿日期:2021-04-21
  • 最后修改日期:2021-06-07
  • 录用日期:2021-07-26
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