Abstract:

Water and energy shortages are a serious constraint to the development of coastal as well as island economies. Coupling a 100% renewable energy sources generation system with hydropower cogeneration can effectively solve this problem. In this paper, an optimization and scheduling model for an integrated wind-photovoltaic-storage desalination system is developed. Firstly, a mathematical and economic model of the units is established, with the objective of minimizing total annual cost of the system. A genetic algorithm (GA) is used to solve and get the optimal structure and capacity configuration of the system for four typical days: spring, summer, autumn and winter. The satisfaction rate of hydropower in the system is greater than 99%, and the abandonment rate of wind and light in the system is less than 2%. The optimal operating scenarios for each typical day is established, including the production loads of the wind, photovoltaic, and reverse osmosis units, the matching relationship between supply and demand, and the operating status of each unit's equipment. The results show that the power supplied by the wind and solar hybrids is relatively smooth in all typical days. The operating load of the reverse osmosis unit varies greatly, but the duration of rated power operation is around 50%. The pumped storage unit also gives full play to its role in peak shaving and valley filling, accounting for more than 75% of the operating on all typical days. The system designed in this paper provides guidance for the industrial operation of hydropower cogeneration systems.

Key words: photovoltaic-wind hybrid, hydropower cogeneration, optimal design, optimal scheduling, pumped storage

摘要：

水和能源短缺严重制约沿海以及海岛经济的发展。将可再生能源与水电联产系统耦合，可有效解决这一问题。本文建立了风光储一体化水电联产系统的优化和调度模型。首先，建立了各单元的数学和经济模型，以系统的总年费最低为目标。然后运用遗传算法（GA）求解，优化得到春、夏、秋、冬4个典型日的系统最佳结构及容量配置。系统中水电的满足率大于99%，并且弃风、弃光率小于2%。最后确立了各典型日的最佳运行方案，包括风力、光伏、反渗透单元的生产负荷，供需匹配关系及各单元设备运行状态。结果表明：各典型日中风光互补供给功率均比较平稳，反渗透单元的运行负荷变化较大，但额定功率运行的时长均为50%左右。抽水储能单元也充分发挥其削峰填谷的作用，在各典型日的运行时长占比均超过75%。本文设计的系统为水电联产系统工业化运行提供指导。

关键词: 风光互补, 水电联产, 优化设计, 优化调度, 抽水储能