Operation Modes and Combination Control for Urban Multivoltage-Level DC Grid

Operation Modes and Combination Control for Urban Multivoltage-Level DC Grid
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城市多电压等级直流电网运行方式及组合控制

DOI:
10.1109/tpwrd.2017.2735482
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发表时间:
2018-02
影响因子:
4.4
通讯作者:
Wang Meiyan
Wang Meiyan
中科院分区:
工程技术2区
文献类型:
--
作者:
Sun Kaiqi;Li Ke-Jun;Wang Zhuo-di;Sun Huadong;Wang Mingqiang;Liu Zhijie;Wang Meiyan

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随着城市经济的发展和可再生能源的日益融合,城市电网面临的挑战越来越大。由于输电压力和短路电流的限制,传统的城市电网已不能满足新的要求。多电压等级直流电网(MDCG)是城市电网升级改造的一种可选方式。本文提出了一种MDCG拓扑,它可以用于未来的城市电网。提出了城市MDCG的三种运行模式:自动运行模式、限功率运行模式和单机运行模式。自动运行模式是城市MDCG的正常运行模式。限功率运行模式的设计是为了在紧急情况下保持对城市高压交流输电网的支持能力。独立运行模式用于在DC-DC变换器系统发生断电时保持稳定。提出了三种运行模式的组合控制,以提高城市多媒体CG在各种运行条件下的可靠性。仿真结果表明,所提出的运行模式和组合控制是有效的,具有良好的性能。
With the development of urban economy and the growing integration of renewable energy, there are increasing challenges on the urban power grid. Due to the transmission stress and short-circuit current limitation, the traditional urban power grid cannot satisfy the new requirements. Multivoltage-level dc grid (MDCG) is an alternative approach to the urban power grid upgrade. This paper presents an MDCG topology, which can be used in a future urban power grid. Three operation modes of an urban MDCG are proposed: auto operation mode, power-limited operation mode, and stand-alone operation mode. The auto operation mode is the normal one for urban MDCG. The power-limited operation mode is designed to keep the capability to support urban high voltage ac transmission grid in emergencies. The stand-alone operation mode is used to keep stability in case the dc–dc converter system outage occurs. The combination control of three operation modes is put forward to enhance the reliability of urban MDCG in various operating conditions. The simulation results show that the proposed operation modes and combination control are effective and have good performance.
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