湖南电力 ›› 2022, Vol. 42 ›› Issue (6): 54-58.doi: 10.3969/j.issn.1008-0198.2022.06.009

• 研究与实验 • 上一篇    下一篇

弱电网中LLCL型并网逆变器的谐波混合阻尼控制策略

李圣清1, 唐昕昀1, 朱辉2, 彭晓玮3, 黄心沿2   

  1. 1.湖南工业大学电气与信息工程学院,湖南 株洲 412007;
    2.湖南红太阳光电科技有限公司,湖南 长沙 410221;
    3.湖南科瑞变流股份有限公司,湖南 株洲 412007
  • 收稿日期:2022-10-27 修回日期:2022-11-30 出版日期:2022-12-25 发布日期:2023-01-13
  • 作者简介:李圣清(1968),男,湖南人,教授,主要研究方向为电能质量调节与控制、电力电子系统控制技术等。唐昕昀(1996),男,湖南人,硕士研究生,通信作者,主要研究方向光伏逆变器并网控制技术、电能质量控制技术等。
  • 基金资助:
    国家自然科学基金(51977072)

Harmonic Mixed Damping Control Strategy for LLCL Grid-Connected Inverter in Weak Power Grid

LI Shengqing1, TANG Xinyun1, ZHU Hui2, PENG Xiaowei3, HUANG Xinyan2   

  1. 1. School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China;
    2. Hunan Red Solar Photoelectricityscience And Technology Co.,Ltd.,Changsha 410221, China;
    3. Hunan Kori Convertors Co.,Ltd.,Zhuzhou 412007, China
  • Received:2022-10-27 Revised:2022-11-30 Online:2022-12-25 Published:2023-01-13

摘要: 为了能在弱电网中更好地抑制开关频率和系统谐振峰处谐波,提出一种弱电网中LLCL型并网逆变器的谐波混合阻尼控制策略。首先对比分析了LLCL型与LCL型滤波器的幅频特性,然后在有源阻尼法基础上添加无源阻尼法,通过对有源阻尼中k值和无源阻尼中R值的设定,在不过多增加损耗的情况下,减少有源阻尼法受控制延迟的影响,将两种方法的优势相结合。最后仿真实验表明,该控制策略对谐波具有较好的抑制效果,比有源阻尼法电网谐波总畸变率下降了1.18%,并且在不同弱电网情况下,具有良好的稳定性和适应能力。

关键词: LLCL型滤波器, 混合阻尼控制策略, 有源阻尼法, 无源阻尼法, 弱电网

Abstract: In order to suppress the harmonics of switching frequency and system resonant peak in weak power grid, a harmonic mixed damping control strategy for LLCL grid-connected inverter in weak power grid is proposed.First the LLCL type and LCL type amplitude frequency characteristics of the filter are analyzed, and then based on the active damping method to add the passive damping method, through the active damping of k value and R value set in the passive damping, under the condition of no more loss, the effect of active damping method by control delay is reduced, combining the advantages of two methods.Finally, the simulation results show that the proposed control strategy has good harmonic suppression effect, and the total harmonic distortion rate is reduced by 1.18% compared with the active damping method, and it has good stability and adaptability under different weak power networks.

Key words: LLCL filter, mixed damping control strategy, active damping method, passive damping method, weak grid

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