Technical Scheme Design of an MVAC Distribution Network Project for Demonstration with MVDC-Flexible Interconnection

Zhiwen WEI; Yu LUO; Yuanfang ZENG; Biao ZHAO; Kangsheng CUI; Haibo LI; Jian SHI

doi:10.12204/j.issn.1000-7229.2022.03.001

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Electric Power Construction ›› 2022, Vol. 43 ›› Issue (3) : 1-11. DOI: 10.12204/j.issn.1000-7229.2022.03.001

Research and Application of Key Technologies for Distribution Network Planning and Operation Optimization under New Energy Power Systems ·Hosted by Professor WANG Shouxiang, Dr. ZHAO Qianyu·

Technical Scheme Design of an MVAC Distribution Network Project for Demonstration with MVDC-Flexible Interconnection

Zhiwen WEI ¹ ,
Yu LUO ¹ ,
Yuanfang ZENG ¹ ,
Biao ZHAO ² ,
Kangsheng CUI ³ ,
Haibo LI ³ ,
Jian SHI ³

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Abstract

Combined with the actual problems of the medium-voltage (MV) AC distribution network in Songshan Lake area of Dongguan, the technical scheme of an MVAC distribution network project for demonstration with HVDC-flexible interconnection is studied. The main wiring mode, connection transformer configuration and grounding mode are demonstrated. The modular multi-level converter and power electronic DC transformer in the system are preliminarily designed, and the technical requirements for key equipment are determined. The system overcurrent and overvoltage characteristics are analyzed by simulation, thus overcurrent tolerance and insulation coordination requirements being put forward. The overall control architecture and protection configuration of the system are designed, and the control and protection strategy of the system is defined. The new main connection topology proposed in this article is used in a practical demonstration project. The scheme of high-ripple design for compact equipment is adopted and the AC fault coordination response strategy is proposed. All those new technologies are demonstrated and verified with simulation, which provide reference for follow-up related research and engineering practice.

Key words

MVDC-flexible interconnection / demonstration project / system analysis / modular multilevel converter (MMC) / power electronic DC transformer

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Zhiwen WEI , Yu LUO , Yuanfang ZENG , et al . Technical Scheme Design of an MVAC Distribution Network Project for Demonstration with MVDC-Flexible Interconnection[J]. Electric Power Construction. 2022, 43(3): 1-11 https://doi.org/10.12204/j.issn.1000-7229.2022.03.001

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