高压电极锅炉联合煤电机组参与调频服务的优化经济调度方法

Optimized Economic Dispatching Approach for High-voltage Electrode Boiler Combined with Coal-fired Power Units to Participate in Frequency Regulation Service

通过高压电极锅炉等灵活能源设施与煤电机组联合,可提高煤电平台灵活性,满足电网中高比例可再生能源对系统调频服务提出的高要求。为了合理配置资源,提高系统调频灵活性的同时确保经济性最优,提出高压电极锅炉联合煤电机组参与调频服务的优化经济调度方法。首先,分析调频辅助服务收益并建立收益模型;其次,对高压电极锅炉与煤电机组调频特性进行描述,对比关键调频特性;最后,针对调度单次调频信号,以经济性最优为目标,考虑不同机组调频特性下爬坡、容量、信号幅值等约束,给出高压电极锅炉联合煤电机组参与单次调频的优化经济调度方法。当调频服务对响应时间要求高时,可利用本文方法获得联合机组的单次调频经济调度图或调度表,以供实际运行时使用。由案例对方法进行了验证,结果表明,通过本文方法对调度调频信号在不同机组间进行合理配置,可在提高联合机组调频灵活性的同时保证经济性最优,为灵活能源设施与煤电联合下的优化经济调度运行提供了参考。

By integrating flexible energy facilities such as the high-voltage electrode boiler with coal-fired power units, the flexibility of the coal-fired power platform can be significantly improved, which is the key solution for the challenges of system frequency regulation due to the high penetration of renewable energy in power system. In order to allocate resources properly and improve the flexibility of power system for frequency regulation while ensuring the optimal economy, an optimized economic dispatching approach for high-voltage electrode boiler combined with coal-fired power units to participate in frequency regulation service was proposed. First, the revenue of frequency regulation auxiliary services were analyzed and the revenue model was established. Then, the frequency regulation characteristics of high-voltage electrode boiler and coal-fired power units were elaborated and compared. For dispatching single frequency regulation signal properly, the economy was taken as the optimized goal and different constraints were considered related to the units ramping rate, capacity and signal amplitude, etc. Therefore, an optimized economic dispatching approach were proposed for the high-voltage electrode boiler combined with coal-fired power units to participate in a single frequency regulation. When the frequency regulation service stresses high requirements for the response time, the economic dispatching diagram or dispatching table of the combined units under the single frequency regulation could be formulated by the proposed approach for the practical operation. A calculation case is carried out, and the results show that the proper dispatching frequency regulation signal among different units by the proposed approach can improve the flexibility of units in frequency regulation while ensuring the optimal economy, which provides a reference for joint operation between flexible energy facilities and coal-fired power units.