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ISSN 0254-0096 CN 11-2082/K

太阳能学报 ›› 2022, Vol. 43 ›› Issue (11): 50-59.DOI: 10.19912/j.0254-0096.tynxb.2021-0544

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光伏准Z源H桥级联多电平逆变器并网调制技术

孟志强1, 邵武1, 唐杰2, 尹进田2   

  1. 1.湖南大学电气与信息工程学院,长沙 410001;
    2.邵阳学院多电源地区电网运行与控制湖南省重点实验室,邵阳 422000
  • 收稿日期:2021-05-17 出版日期:2022-11-28 发布日期:2023-05-28
  • 通讯作者: 邵 武(1990—),男,博士研究生,主要从事光伏发电技术方面的研究。shaowuhnu@126.com
  • 基金资助:
    湖南省教育厅重点项目(19A447); 湖南省自然科学基金面上项目(2020JJ4558)

GRID-CONNECTED MODULATION TECHNOLOGY OF PHOTOVOLTAIC QUASI-Z-SOURCE H-BRIDGE CASCADED MULTI-LEVEL INVERTER

Meng Zhiqiang1, Shao Wu1, Tang Jie2, Yin Jintian2   

  1. 1. School of Electrical and Information Engineering, Hu'nan University, Changsha 410001, China;
    2. Key Laboratory of Hunan Province for Power Grid Operation and Control in Multi-Source Areas, Shaoyang University, Shaoyang 422000, China
  • Received:2021-05-17 Online:2022-11-28 Published:2023-05-28

摘要: 该文针对光伏准Z源逆变器的运行特点,基于逆变器两态滞环电流控制工作原理,提出一种能使逆变器直通实现光伏MPPT的三态滞环控制器和单相准Z源级联逆变器三态滞环控制系统,分析三态滞环控制器的工作原理,并用三单元准Z源级联逆变器系统仿真,对比研究三态滞环控制、载波层叠法和载波移相法的控制效果。仿真结果表明,三态滞环控制调制策略表现出更好的稳态和动态响应性能,其并网电流谐波畸变率更小。

关键词: 光伏发电, 逆变器, 滞环控制, 级联H桥, 准Z源

Abstract: The technical guidelines for grid-connected photovoltaic power generation require grid-connected inverters to achieve high power factor, and also set clear requirements for the total harmonic distortion (THD) of the grid-connected current. At present, the above goals are mainly achieved by modulating the grid-connected current of photovoltaic grid-connected inverters. Aiming at the operating characteristics of the photovoltaic quasi-Z source inverter, based on the working principle of the inverter's two-state hysteresis current control, a three-state hysteresis controller and single-phase quasi-loop controller that can make the inverter pass through to achieve photovoltaic MPPT are proposed. The three-state hysteresis control system of the Z-source cascaded inverter is analyzed. The working principle of the three-state hysteresis controller is analyzed, and the three-unit quasi-Z-source cascaded inverter system is used to simulate the three-state hysteresis control and carrier wave. The control effect of the stacking method and the carrier phase shifting method. The simulation results show that the three-state hysteresis control modulation strategy exhibits better steady-state and dynamic response performance, and its grid-connected current harmonic distortion rate is smaller.

Key words: photovoltaic power generation, inverters, hysteresis control, cascaded H bridge, quasi-Z source

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