Electric Power ›› 2019, Vol. 52 ›› Issue (10): 108-114.DOI: 10.11930/j.issn.1004-9649.201812014

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Scheme Design and Engineering Implementation of DC Grid-Connection and Accommodation of Photovoltaic Power

YANG Zhaoxiang, LI Hongjian, CHEN Lei, CHEN Xiangyu   

  1. State Grid Jibei Electric Economic Research Institute, Beijing 100038, China
  • Received:2018-12-06 Revised:2019-04-13 Online:2019-10-05 Published:2019-10-12
  • Supported by:
    This work is supported by National Key R & D Programof China(Research and Demonstration of Key Technologies for High Voltage and Large Capacity Flexible DC, No.2016YFB0900900)

Abstract: With the development of flexible DC technology, the construction of source-grid -load in distribution network is greatly enriched, and the new-type grid models become possible such as centralized photovoltaic DC grid-connection and DC power supply for data centers. Based on Zhangbei AC & DC distribution network and flexible substation demonstration project, the paper introduces the DC grid-connection scheme for photovoltaic power station and the way of engineering implementation. In the meantime, the connection of DC power supply system is designed for data center and the reliability of power supply is calculated. Compared with the traditional AC distribution network, the advantages of DC distribution network are demonstrated in view of power transmission efficiency, power supply reliability and power quality. The demonstration project has realized the DC integration and accommodation of photovoltaic power generation, and the design results and practical experience can provide a reference for similar projects.

Key words: DC distribution network, photovoltaic, DC grid-connection, DC power supply, power transmission efficiency

CLC Number: