交直流混合微电网可靠性影响因素分析

Analysis of Factors Affecting Reliability of Hybrid AC/DC Microgrid

交直流混合微电网综合了交流微网和直流微网的优点,是未来智能电网的发展趋势之一,而可靠性研究在混合微电网的发展中发挥着基础性作用。以配电网可靠性分析方法为基础,考虑分布式电源接入和微电网孤岛运行对可靠性的影响,提出了适用于交直流混合微电网的可靠性计算方法。对交直流混合微网可靠性进行分析,重点研究了分布式电源接入比例与关键元件的故障率和修复时间对混合微电网可靠性的影响,考虑分布式电源接入比例在[0%,90%]的区间内变化,关键元件的故障率和故障修复时间在基准值[10%,120%]的区间内变化,利用算例,对给定拓扑中各因素对混合微电网可靠性的影响进行定量分析,得到分布式电源接入比例对该拓扑可靠性的影响规律,并将关键元件对该拓扑可靠性影响程度进行排序,为交直流混合微电网可靠性研究进行了有益探索。

Hybrid AC/DC microgrid, combining the advantages of AC microgrid and DC microgrid, is one of the future development trends of power grid, and its reliability research plays a fundamental role in the development of hybrid microgrid. On the basis of reliability analysis method of distribution network, considering the influence of distributed power and island operation of microgrid, a reliability calculation method for hybrid AC/DC microgrid is proposed. This paper focuses on the influence of distributed power supply ratio, the failure rate and repair time of key components on the reliability of hybrid AC/DC microgrid. Considering the change of the distributed power supply ratio in the range of [0%, 90%], the failure rate and the fault repair time of the key components change within the interval of the reference value [10%, 120%]. By using the example, the influence of the factors in the given topology on the reliability of the hybrid microgrid is quantitatively analyzed, and the influence rule of the distributed power supply ratio on the topology reliability is obtained, and the influence of the key components on the reliability of the topology is sorted, which provides a useful exploration for the reliability study of hybrid AC/DC microgrid.