基于改进Gossip算法的多微网孤岛系统分布式电力交易策略
Distributed Electricity Trading Strategy of Interconnected Microgrids in Islanding Mode Based on Improved Gossip Algorithm
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摘要: 多微网系统的去中心化是微电网的重要发展趋势。关注多微网系统的分布式控制策略,将Gossip算法应用于由多个微电网组成的组合孤岛系统中;给出零售市场的电力交易模型,追求使多微网系统全局目标函数最小化的电价;基于双向平衡Gossip算法实现多微电网的电价决策;为保证安全隐私,设计一种具有隐私保护功能改进Gossip算法,以增加迭代次数为代价,避免成本函数共享。最后,通过算例仿真验证了采用Gossip算法的电力交易策略对孤岛运行状态下的分布式多微网系统的有效性。Abstract: The decentralization of the multi-microgrid system is an important development trend of microgrid. In this paper, we focus on the distributed control strategy of the multi-microgrid system. This paper applies Gossip Algorithm to a composite islanding system composed of several microgrids, presents an electricity trading model of retail market, and aims to minimize the global objective function of the multi-microgrid system. The electricity pricing is achieved in the multi-microgrid based on pairwise equalizing Gossip algorithm. To ensure security and privacy, an improved Gossip algorithm is designed with privacy protection to avoid cost function sharing at the expense of increasing the iteration time. Finally, the effectiveness of the proposed method for the distributed multi-microgrid system in islanding mode is verified by the simulation result of the example.