采用二级热网电锅炉调峰的消纳弃风机理及经济性分析

Analysis on Mechanism of Curtailed Wind Power Accommodation and Its Economic Operation Based on Electric Boiler for Peak-load Regulation at Secondary Heat Supply Network

针对中国西北、华北、东北(简称"三北")地区冬季供暖期弃风现象日益严重的问题,在研究电负荷特性、热负荷特性与风电场出力特性相关性基础上,结合电网调峰、热网调峰特点,提出二级热网配置电锅炉进行日调峰的消纳弃风方案。分析了方案的消纳弃风机理,研究了调峰电锅炉的启停控制策略,构建了基于二级热网电锅炉调峰的电热联合系统优化调度模型,并分析了方案的经济性。研究表明,该方案能在降低热电机组热负荷峰值、"以热定电"必发电功率的同时增加电网负荷谷值,从而为风电上网留出更大空间,提升风电消纳率,且能为整个电热联合系统带来经济收益。

Confronted by the ever-deteriorating problem of wind power abandoning during winter heat supply period in Northeast,North,and Northwest China,the solution of wind power accommodation by installing an electric boiler in the secondary heat supply network for daily peak-load regulation is proposed by referring to the characteristics of peak-load regulation of power grid and heat supply network following a study of the characteristics of electrical load,thermal load and wind power output. The mechanism of the scheme to improve wind power accommodation is analyzed as is the start-stop operation strategy for the peak-shaving electric boiler. An energy-saving model for the joint heat and power system based on the electric boiler for peak-load regulation at the secondary heat supply network is developed with the economic operation taken into account. The simulation result shows that this plan can reduce heat load peak value and forced power output determined by the heat of cogeneration units while increasing the valley value of electrical load. In this way,more reserve of power grid is left to enhance wind power accommodation for even greater economic benefits of the whole system.