多并网逆变器系统谐振抑制策略
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(1.国网湖北省电力公司电力科学研究院电网技术中心,湖北 武汉 430077; 2.武汉大学电气工程学院,湖北 武汉 430072)

作者简介:

胡 伟(1981—),女,通信作者,博士,工程师,研究方向为微电网建模、电能质量、直流输电控制保护。E-mail:huweitest@163.com

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基金项目:

国家自然科学基金资助项目(51277137)


Research on resonance suppression strategy of system with multiple grid-connected inverters
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(1. Department of Grid Center, State Grid Hubei Electric Power Research Institute, Wuhan 430077, China;2. School of Electrical Engineering, Wuhan University, Wuhan 430072, China)

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    摘要:

    多并网逆变器之间的交互影响会引发谐振,威胁系统的安全稳定运行。为了解决谐振问题,建立了多并网逆变器阻抗网络,分析了谐振抑制机理,基于导纳重构原理,提出了一种基于虚拟导纳的全局谐振抑制策略。该策略利用公共连接点处谐波电压产生和谐振频率相关的虚拟导纳,动态调整网络阻抗,抑制系统的谐振。以两个并网逆变器系统为例,理论分析了谐振抑制效果,仿真和实验验证了所提全局谐振抑制策略的可行性和有效性。

    Abstract:

    The interactions between multiple grid-connected inverters can cause resonance and threaten the security and stability of the system. To address the problem of the resonance, the impedance network is built and the resonance suppression mechanism is analyzed, then a global resonance suppression strategy is proposed based on the principle of admittance reconstruction. The strategy is to dynamically reshape the impedance network using the virtual impedance generated by the public connection point harmonic voltage, such that the potential oscillations and resonance propagation in the parallel grid-connected converters can be mitigated. To validate the effectiveness of the active damper, simulations and experimental tests on a two converter-based setup are carried out. Simulation and experimental results are provided to verify the feasibility and validity of the proposed strategy. This work is supported by National Natural Science Foundation of China (No. 51277137).

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胡伟,周友斌,杜镇安,等.多并网逆变器系统谐振抑制策略[J].电力系统保护与控制,2017,45(14):45-50.[HU Wei, ZHOU Youbin, DU Zhenan, et al. Research on resonance suppression strategy of system with multiple grid-connected inverters[J]. Power System Protection and Control,2017,V45(14):45-50]

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  • 收稿日期:2016-07-12
  • 最后修改日期:2016-10-09
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  • 在线发布日期: 2017-07-25
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