Comprehensive Benefit And Market Dealing Model Analysis Of Community PV Microgrid

With the popularization and application of photovoltaic power generation, the user side photovoltaic microgrid has become the most effective way to apply the distributed power generation system. Community photovoltaic microgrid groups will form in the future. Currently photovoltaic microgrid control and protection technology is already quite mature. This article focuses on the comprehensive benefit assessment of PV microgrid after it put into operation, and the future trading model of microgrid participating in electricity market.To analysis the cost and benefit of microgrid, this paper dived microgrid costs into installed cost of distributed generation, energy storage, control systems operation costs during the management and maintenance costs from the perspective of the whole life cycle. The comprehensive benefit of microgrid is analyzed according to its technical characteristics. Microgrid economy evaluation is combined static evaluation and dynamic evaluation.Electricity market energy transactions can be divided into spot transactions and forward transactions. According to the unpredictable characteristics of microgrid power generation and load plan, microgrid is better suited to participate in spot trading. The modes of microgrid participating in spot trading are bilateral transactions and pool transaction, and the market trading rules in two modes are analyzed in detail and the advantages and disadvantages of the two models are compared. Analyze the technical features of microgrid participating in frequency adjustment, peaking adjustment, reactive power standby and other grid ancillary services.A market transactions model based on a cooperative game theory is proposed to adapt the trend after microgrids form communities in the future. Establish coalition of photovoltaic microgrid groups using the information sharing between groups through intelligent communication and control systems. Coalition benefit can be improved by sharing energy in the coalition. Shapley value method is used to the allocate coalition benefits, and a real-time transaction settlement rules is proposed based on the benefits allocating to every microgrid in the coalition to complete the transaction settlement of microgrid with microgrid or microgrid with grid. A numerical example demonstrates the validity of the model.