促进风电消纳的蓄热罐运行策略

热电厂中配置蓄热罐有助于改善其调峰能力和提高风电接纳水平。鉴于蓄热罐的引入一定程度上增加了电厂调度的难度,提出了基于双线性模型的调度策略以开展热电机组与蓄热罐的协调运行。所提调度策略中采用了蓄热罐运行状态的预判方法,并重点应用了弃风率和成本增长率的技术指标,通过调整电出力以减小弃风,控制热出力以降低运行成本,并进一步考虑风电的不确定性,制定了最优调度方案。算例分析表明,所提调度策略能够高效利用蓄热罐的蓄放热能力,提高风电接纳量与优化机组成本。

Operation Strategy for Heat Storage Tank to Improve Wind Power Accommodation

The application of the heat storage tank in combined heat and power(CHP)units can contribute to improving the cogeneration system''s abilities in peak-load regulation and wind power consumption. Since the use of the heat storage tank increases the difficulty in optimal dispatching, a novel power scheduling strategy based on two linear models is proposed to coordinate the operation of CHPs and heat storage tank. For the proposed scheduling strategy, the operation state of heat storage tank can be pre-judged, and the two technical indexes including the rate of wind power curtailment and the growth rate of running cost are taken into account. According to the adjustments of electric power and thermal power, wasted wind power and running cost can be reduced, respectively. Furthermore, an optimal dispatching plan is obtained in consideration of the uncertainty of wind power generation. Numerical examples are conducted to demonstrate the effectiveness of the proposed scheduling strategy in achieving efficient utilization of the heat storage tank, improvement of wind power consumption and decrease in operation cost.