含非可靠分布式电源的配电网孤岛划分

当大量分布式电源接入电网时,合理的孤岛运行方式可以在配电网故障期间充分发挥分布式电源的潜能,提高配电系统运行可靠性。根据分布式电源的供电特性和配电网孤岛运行的特点,建立了不同可靠性类型的分布式电源联合供电表达式,并根据电力负荷的等级和可控性,在满足各类安全约束的基础上,建立了优先恢复一、二级负荷供电,提升配电网最大供电收益的智能配电网孤岛划分数学模型。该模型全部采用解析性表达,利用数学优化方法求解,最大程度上实现解的最优性。经多个算例的计算结果,证明了所提模型的有效性和实用性。

Island Partition of Distribution Network with Unreliable Distributed Generators

For its ability to improve the system reliability by bringing the potential of the distributed generators (DGs) into full play under fault conditions, island partition has become an important operation mode. Based on the characteristics of the DGs and islanded operation of the distribution network, the combined power supply expression of different reliability types for DGs is established. And according to the load level and controllability, the priority to recovering the first-level and second-level load is given based on meeting the various security constraints. A mathematical model based on island partition of distribution network is developed. As all solutions are found using analytical expressions of mathematical optimization, the solution optimization is realized to the full. The effectiveness and practicability of the model proposed is proved by a number of test results. This work is supported by National Natural Science Foundation of China (No. 51107011, No. 51167001) and the Scientific Research Foundation of Guangxi University (No. XBZ120037).