新能源接入直流电网实证及试验方案研究

Research on Renewables-based DC Grid Demonstration System and Experimental Strategy

全球能源互联网是解决全球能源危机和环境问题的有效方式之一,而直流电网技术具备大规模新能源汇集及远距离输送能力,且可实现不同电压等级、不同区域网络电力系统的广域互联,是构建全球能源互联网的基础。结合直流电网技术特征和需求,提出一种含风力发电、光伏发电和储能单元的四端口直流电网实证拓扑,提炼了直流电网实证系统的关键装置需求,设计各关键装置的拓扑结构及其控制策略,基于Matlab/Simulink平台搭建直流电网等效仿真模型并开展多应用场景和运行工况的仿真分析,依托已构建的直流电网实证系统开展实验验证。

Global Energy Interconnection（GEI） is one of the effective ways to solve global energy crisis and environmental problems, while DC grid technology with large-scale renewable energy collection and long-distance transmission capacity, which also can achieve wide area interconnection among different voltage levels and different regional network of power system, is the fundamental element of establishing GEI. Combined with DC grid technology characteristics and demands, this paper proposes a four-terminal DC grid demonstration topology, which includes wind power generation, photovoltaic power generation and energy storage unit. The key facility requirements of DC grid demonstration system are refined, and the corresponding topology and control strategy is designed. Based on the Matlab/Simulink platform, the equivalent simulation model of DC grid is built and simulation analysis on multiple application scenarios and operation condition is carried out, and experimental verifications are undertaken based on the constructed DC grid demonstration system.