Integrated energy system（IES） can adjust the power purchase/sale injected to power grid through internal flexible dispatching,and a large number of IES integration can improve the fault recovery capability of distribution network. To address the problem that the economic requirement of IES is not fully considered in fault recovery of distribution network,a distribution network fault recovery method that takes into account the benefits of both integrated energy aggregator（IEA） and distribution company is proposed. The calculation and distribution models of fault power gap in distribution network are developed,which provides the optimal distribution of power gap in distribution network within IEA among various IESs. The game strategy between IEA and distribution company is proposed,in which load shedding,network losses and compensation costs of IEA are comprehensively considered. Simulative results show that the proposed method provides a better fault recovery under the premise of satisfying the interests of IEA,as well as the price compensation mechanism between the power grid and IEA.

Micro-energy network is an important form of multi-energy coupling on the user side, and the access of a large number of micro-energy networks has a significant impact on the reliability of energy supply. In view of the insufficient research on the micro-energy network operation mode and the energy support method in the current reliability evaluation, the reliability evaluation method of the electricity-gas-heat coupled system considering the energy support of the micro-energy network is proposed. According to the inter-network support and multi-energy support, five types of micro-energy network operation modes after failures are defined: parallel operation, incomplete island independent operation, incomplete island coordinated operation, complete island independent operation, and complete island coordinated operation. A framework for failure impact analysis and reliability evaluation considering the operation mode of the micro-energy network is constructed. The static islanding method based on the power circle is used to determine the island range and operation mode of the micro-energy network.A unified multi-energy load dynamic reduction model of island is established, which suits various micro-energy network operation modes. The calculation results show that after the failure, the multi-energy coupling and the coordinated optimization operation of micro-energy grids on the user side could realize the efficient support between the electricity-gas-heat system and support more important loads.

综合能源系统（integrated energy system, IES）具有灵活调度和多能互济的特点,针对当前综合能源系统供能可靠性研究尚不充分的问题,提出一种考虑最优负荷削减与热负荷惯性的综合能源系统可靠性评估方法。首先,建立了综合能源系统总停供损失期望指标,充分体现了综合能源系统停供能造成的经济损失;其次,考虑能源品位、负荷重要度、热负荷惯性,建立了故障场景下综合考虑运行成本最小与加权停供负荷量最小为目标的综合能源系统最优负荷削减模型,采用CPLEX软件求解获得电热负荷削减功率和元件设备出力;然后,基于序贯蒙特卡洛模拟原理,设计了综合能源系统可靠性评估方法和流程;最后,通过算例仿真进行验证。算例分析表明,采用最优负荷削减策略和考虑热负荷惯性能够有效提升综合能源系统的可靠性水平。

In this paper, an integrated energy system (IES) reliability assessment method based on sequential Monte Carlo simulation and fault recovery optimization is proposed considering the flexibility of dispatch and the complementary of multi-energy in IES. The reliability evaluation indices of IES are established considering the energy supply and thermal load delay characteristics. An IES failure recovery optimization model is established in which the shutdown loss and the minimum operating cost under the failure scenario are considered comprehensively. CPLEX software is applied to solve the proposed problem in order to obtain the electric and thermal load reduction power and component equipment output. Based on the principle of sequential Monte Carlo simulation, an IES reliability assessment method and process are designed. The analysis of calculation examples shows that the use of failure recovery optimization strategies and consideration of thermal load delay characteristics can effectively improve the reliability of IES.