Optimal Scheduling of Combined Heat and Power Based Microgrid Considering Hydrogen Energy Storage Power Station Services
摘要
In order to achieve a win-win situation between micro grid and hydrogen energy storage power station, in this study a combined heat and power (CHP) supply based micro-grid was built by considering the services of hydrogen energy storage power station and demand response. The system combines electricity, heat and hydrogen energy and realized the energy conversions among them.And the waste heat recovery was included to effectively improve the whole energy utilization. Then, a double planning model with two optimization problems was presented. The upper-level model focused on optimizing hydrogen energy storage power stations and aiming to minimize the total operating cost of these stations. The lower-level model analyzed the optimization operation model of microgrid system with hydrogen energy storage power stations to achieve the goal of minimizing the total operating cost of the CHP based microgrid. Based on the Lagrange function and KKT condition, lower level target were transformed and added into upper level as constraint conditions, and then the large-M method was used to solve the problems by transforming the nonlinear programming problem into a mixed integer linear programming problem. The impacts of price type and alternative load ratio on the system were analyzed, and the appropriate ratio could be given to maximize the benefits of the system. Considering the characteristics of two typical seasons, winter and summer, three scenarios were selected for comparative analysis. The results verified the feasibility and effectiveness of the model. After reasonably adjusting the load proportion of demand response, the system had lower operational cost and better economic efficiency.