Planning and analysis of the demonstration project of the MVDC distribution network in Zhuhai

doi:10.1007/s11708-018-0599-2

Front. Energy

2019, Vol. 13

Issue (1) : 120-130 https://doi.org/10.1007/s11708-018-0599-2

RESEARCH ARTICLE

Planning and analysis of the demonstration project of the MVDC distribution network in Zhuhai

Lu QU¹, Zhanqing YU¹, Qiang SONG¹, Zhichang YUAN¹, Biao ZHAO¹, Dawei YAO¹, Jianfu CHEN², Yao LIU², Rong ZENG¹(

)

¹. State Key Lab of Power Systems, Department of Electrical Engineering, Tsinghua University; Advanced DC Power Center, Energy Internet Institute, Tsinghua University, Beijing 100084, China
². Zhuhai Power Supply Bureau, Zhuhai 519000, China

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Abstract

The DC distribution system is an important development direction of the distribution system, which can improve the reliability and the quality of the power supply, and support the new energy, the energy storage, the electric vehicles, and the flexible access of AC and DC loads to grid. To realize the demonstration application of the DC distribution technology, China’s first demonstration project of the medium voltage DC distribution network will be built in Zhuhai, Guangdong Province to support the construction of the city energy internet. First, this paper analyzes the demand of the DC distribution network project, and puts forward the construction content and construction target. Then, it designs and analyzes the electrical connection mode, system operation mode, and startup and shutdown mode of the DC distribution network, and proposes the overall project construction plan. Finally, it conducts the specific project design and analysis, which mainly include the selection of equipment such as inverters, DC transformers and DC circuit breakers, the design and analysis of the DC control and protection system, the design and analysis of the over-voltage protection and the configuration scheme of the lightning arrester, and analysis of the system transient characteristics. The design and analysis of the engineering program is a combination of China’s distribution network engineering practice and technical characteristics, which lays a solid foundation for the advancement of the DC power distribution technology in China, and has reference value and demonstration effect for the design and construction of other projects.

Keywords MVDC distribution network DC solid state transformer DC circuit breaker modular multilevel converter

Corresponding Author(s): Rong ZENG

Online First Date: 03 December 2018 Issue Date: 20 March 2019

Cite this article:

Lu QU,Zhanqing YU,Qiang SONG, et al. Planning and analysis of the demonstration project of the MVDC distribution network in Zhuhai[J]. Front. Energy, 2019, 13(1): 120-130.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-018-0599-2
https://academic.hep.com.cn/fie/EN/Y2019/V13/I1/120

Fig.1 Location of substations with voltage classes of 110 kV and above

Fig.2 Demonstration project plan of medium voltage DC distribution system

Fig.3 Grounded symmetric unipolar connections on AC side

Fig.4 Switch between operating modes

Fig.5 ±10 kV DC bus voltage waveform during DC power distribution system startup

Fig.6 Converter topology of Tangjia Station and Jishan II Station

Fig.7 Topology of ICC-MMC based on IGCT

Fig.8 Simulation waveforms of transient fault

Fig.9 Topology of DC transformer

Fig.10 Topology of hybrid DC circuit breaker

Fig.11 Architecture of DC control system

Fig.12 Optimal control results of Tangjia Station

Fig.13 Protection area of DC power distribution system

Fig.14 Arrester configuration scheme of main converter area

Fig.15 DC voltage and current waveform of bipolar fault

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