With the integration of distributed renewable energy to the distribution network and the development of multiterminal flexible DC transmission technology, multiterminal flexible DC distribution network has broad application prospects. At the same time, with the rapid development of new energy vehicles, the echelon utilization of power battery has become a research hotspot. By analyzing the characteristics of flexible DC distribution network and echelon utilization battery, the structure and control strategy of modular multilevel converter (MMC), DC solid-state transformer, photovoltaic power generation, wind power generation, and echelon utilization battery energy storage system are established, respectively, in this paper. To achieve a DC network connection of various types of power supply and load, this paper proposes a starting method of multiterminal flexible DC distribution network and a cooperative control strategy of the wind-solar-storage system. A six-terminal ring-shape DC distribution network model is built in real-time digital simulation (RTDS) platform. The simulation results show that the modeling methods and control strategies of each component in the real-time simulation model meet the operation requirements of the multiterminal flexible DC distribution network, which provides a reference for the construction and research of the flexible DC distribution network.

中文翻译：

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梯次利用动力电池多端柔性直流配电网建模与控制策略

随着分布式可再生能源并入配电网和多端柔性直流输电技术的发展，多端柔性直流配电网具有广阔的应用前景。同时，随着新能源汽车的快速发展，动力电池的梯次利用成为研究热点。通过分析柔性直流配电网和梯次利用电池的特点，建立了模块化多电平换流器（MMC）、直流固态变压器、光伏发电、风力发电、梯次利用电池储能系统的结构和控制策略，分别在本文中。实现各类电源和负载的直流网络连接，提出了一种多端柔性直流配电网的启动方法和风储电协同控制策略。在实时数字仿真（RTDS）平台上建立了六端环形直流配电网模型。仿真结果表明，实时仿真模型中各组成部分的建模方法和控制策略满足多端柔性直流配电网的运行要求，为柔性直流配电网的建设和研究提供了参考。