电气工程学报 ›› 2016, Vol. 11 ›› Issue (10): 19-23.doi: 10.11985/2016.10.004

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直流微电网并网接口控制策略研究

李慧,罗奇,范新桥   

  1. 北京信息科技大学自动化学院 北京 100192
  • 收稿日期:2016-05-24 出版日期:2016-10-25 发布日期:2020-04-30
  • 作者简介:李慧,女 1976年生,博士,副教授,研究方向为柔性直流输电稳定与控制、微电网控制技术及新能源发电技术。|罗奇, 男 1992年生,硕士研究生,研究方向为柔性直流输电稳定与控制。
  • 基金资助:
    北京市教委科技计划面上项目(KM201511232008);北京市青年拔尖人才培育计划资助(CIT&TCD201404126)

Research on Control Strategy of DC Microgrid Interface Converter

Hui Li,Qi Luo,Xinqiao Fan   

  1. Beijing Information Science and Technology University Beijing 100192 China
  • Received:2016-05-24 Online:2016-10-25 Published:2020-04-30

摘要:

根据直流微电网并网运行的特点,建立了同步旋转dq坐标系下直流微电网并网接口的数学模型;通过对三种功率控制器的控制策略进行分析,提出了考虑电压下垂控制的功率控制器设计方法,实现了并网接口的双向控制,并在保持直流母线电压稳定的同时,获得了输出谐波少、单位功率因数的可控正弦电流。利用PSCAD/EMTDC软件搭建电磁暂态仿真模型,验证了所提出的并网接口控制策略的有效性。结果表明,所设计的控制策略是准确可行的。

关键词: 直流微电网, 电压源换流器, 并网接口, 下垂控制

Abstract:

A mathematical model of DC microgrid interface converter is built in the dq-frame coordinate system, according to its operation characteristic. By analyzing three control strategies of power controller separately, a novel design method of power controller is proposed with DC voltage-active power droop control. Based on the presented control strategy, a two-way grid-connected interface control is realized, and a controlled sinusoidal current is obtained with few harmonic and unit power factor. Meanwhile, DC bus voltage can be kept stable. An electromagnetic transient simulation model is built in PSCAD/EMTDC, and the effectiveness of the new grid-connected interface control strategy is validated. Results show that the proposed control strategy is accurate and feasible.

Key words: DC microgrid, voltage source converter, grid interface, droop control

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