• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2019, Vol. 40 ›› Issue (11): 48-54.doi: 10.3969/j.issn.1000-7229.2019.11.007

• 智能电网 • 上一篇    下一篇

交直流混合微电网互联变流器新型控制策略

朱永强, 张泉, 刘康, 王植,韩民晓   

  1. 新能源电力系统国家重点实验室(华北电力大学),北京市102206
  • 出版日期:2019-11-01
  • 作者简介:朱永强(1975),男,博士,副教授,主要研究方向为交直流混合微电网、新能源发电与并网、能源互联网等; 张泉(1995),男,硕士研究生,主要研究方向为交直流混合微电网、新能源发电与并网等; 刘康(1994),男,硕士研究生,主要研究方向为交直流混合微电网、新能源发电与并网等; 王植(1993),男,硕士研究生,主要研究方向为交直流混合微电网、新能源发电与并网等; 韩民晓(1963),男,教授,博士生导师,主要研究方向为电力电子在电力系统中的应用。
  • 基金资助:
    国家重点研发计划项目(2018YFB0904701)

A New Control Strategy of Interlinking Converter in Hybrid AC/DC Microgrid

ZHU Yongqiang , ZHANG Quan , LIU Kang ,WANG Zhi, HAN Minxiao   

  1. State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources (North China Electric Power University), Beijing 102206, China
  • Online:2019-11-01
  • Supported by:
    This work is supported by National Key Research and Development Program of China(No. 2018YFB0904701).

摘要: 交直流混合微电网是未来电网的发展方向之一。为实现两侧微电网的功率相互支撑,提出了一种新型的互联变流器控制策略。采用双级式互联变流器,解决了在直流微电网电压等级较低时与交流微电网互联的问题,且直流微网电压在较大范围内变化时也可正常运行。针对双级式互联变流器的特点,推导得到交流微网频率与电容电压的数学关系,在功率控制环节采用电压偏差-功率下垂控制策略,实现了两侧子网的功率支撑。PSCAD仿真结果验证了控制策略的有效性。

关键词: 交直流混合微电网, 互联变流器, 相互功率支撑, 电压偏差-功率下垂控制

Abstract: The hybrid AC/DC microgrid is one of the development directions of power grid in the future. In order to support each others power in the microgrid on both sides, a new control strategy of interlinking converter is proposed in this paper. A two-stage interlinking converter is used to solve the problem of interconnection between DC and AC microgrids when the voltage level of DC microgrid is low, and the DC microgrid can operate normally even when the voltage varies in a large range. According to the characteristics of the two-stage interlinking converter, mathematical relationship between the frequency of AC microgrid and the voltage of DC capacitor is derived. The droop control of voltage error-power is adopted in the power control loop, and the power support of the subnetworks on both sides can be realized without communication. PSCAD simulation result verifies the effectiveness of the control strategy.

Key words: hybrid AC/DC microgrid, interlinking converter, mutual power support, droop control of voltage error-power

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