面向韧性提升的交直流混合配电网协同恢复方法

doi:10.11930/j.issn.1004-9649.202209024

摘要/Abstract

摘要： 交直流混合配电网是未来配电网的重要形态。近年来愈发频繁的极端灾害对交直流混合配电网的安全可靠供电提出了严峻挑战，如何提升交直流混合配电网的韧性水平亟待解决。考虑极端灾害造成的时序故障及其修复过程，提出面向韧性提升的交直流混合配电网协同故障恢复方法，充分协同利用分布式电源、移动式应急电源（mobile emergency generators，MEG）和交直流配电网络动态重构，实现极端灾害下关键负荷的快速恢复。在故障时序发生和修复的过程中，通过远程可控制开关（remote-controlled switch，RCS）实现交直流混合配电网交流部分和直流部分的协同动态重构，从而隔离故障并恢复负荷，同时配合分布式电源、MEG的动态调度形成恢复性孤岛，从而保证关键负荷的快速恢复，提升系统韧性水平。采用二阶锥松弛技术将潮流方程进行凸化松弛，使得优化问题转化为可有效求解的混合整数二阶锥规划模型。采用改进的IEEE 33节点交直流混合配电系统验证了所提方法的有效性，以及考虑MEG实时调度、RCS动态重构和配电网交直流部分协同对于配电网韧性提升的重要性。

关键词: 移动式应急电源, 动态网络重构, 交直流混合配电网, 韧性, 极端灾害

Abstract: Hybrid AC/DC distribution network is an important form of future distribution networks. In recent years, increasingly frequent extreme disasters have posed severe challenges to the safe and reliable power supply of hybrid AC/DC distribution networks. It is urgent to enhance the resilience of hybrid AC/DC distribution networks. Considering the sequential fault and its repairing process caused by extreme disasters, a collaborative restoration method for hybrid AC/DC distribution networks is proposed. Distributed generations (DGs), mobile emergency generators (MEGs), and dynamic reconfiguration of AC/DC distribution networks are fully coordinated to achieve rapid restoration of critical loads under extreme disasters. During the sequential fault occurrence and repairing, the collaborative reconfiguration of the AC and DC portions of the hybrid AC/DC distribution networks is implemented to isolate faults and restore loads by remote-controlled switch (RCS). Additionally, restoration islands are formed based on the dynamic dispatching of MEGs and DGs to ensure the rapid restoration of critical loads and improve network resilience. The second-order cone relaxation technique is adopted to convexify the power flow equations in this optimization model. Consequently, the original model is converted to a mixed integer second-order cone programming which can be solved efficiently. A modified IEEE 33-bus hybrid AC/DC distribution network is employed to verify the effectiveness of the proposed method. The importance of considering MEG real-time scheduling, RCS based dynamic network reconfiguration, and AC/DC part coordination of the distribution network for enhancing the resilience is also demonstrated.

Key words: mobile emergency generator, dynamic network reconfiguration, hybrid AC/DC distribution network, resilience, extreme disaster

傅守强, 陈翔宇, 张立斌, 秦超, 曾永康. 面向韧性提升的交直流混合配电网协同恢复方法[J]. 中国电力, 2023, 56(7): 95-106.

FU Shouqiang, CHEN Xiangyu, ZHANG Libin, QIN Chao, ZENG Yongkang. Coordinated Restoration Method of Hybrid AC/DC Distribution Networks for Resilience Enhancement[J]. Electric Power, 2023, 56(7): 95-106.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202209024

https://www.electricpower.com.cn/CN/Y2023/V56/I7/95

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