摘要
大规模风电并网后,系统等效负荷不确定性显著增加。若按照传统方法制定机组组合,则需在日前预留大量旋转备用,使得常规机组的单位发电成本大幅升高。基于为应对风电不确定性而需增加的旋转备用为小概率备用需求的特点,以及风电预测误差随预测时间尺度的缩短逐渐减小的特性,提出了一种多级机组组合制定策略。该策略在制定日前机组组合时适当放松对供电可靠率的要求,降低旋转备用容量,以提高系统运行的经济性,而当实际运行旋转备用不足时制定二次及三次机组组合对原机组组合方案进行调整,以保证系统运行的安全可靠性,各级机组组合协调配合以获得最佳的调度效果。对国内某省网系统的模拟运行结果表明,该策略可在保证系统供电可靠率的前提下有效降低发电成本,且随着风电穿透率的提高,其效果更加显著。
Large-scale wind power adds significant uncertainty to the system equivalent load.The uncertainty requires more substantial day-ahead spinning reserve if traditional unit commitment strategy is still used,which results in significantly higher operational cost.Based on the small probability characteristics of the extra reserve demanded to cater for the wind power uncertainty and the characteristics of wind power forecast error decreasing gradually with time scales,a new multi-level unit commitment strategy is proposed.In the day-ahead unit commitment,the economy can be improved by relaxing power supply reliability.If the spinning reserve cannot meet the actual demand in the system operation,the unit commitment scheme should be adjusted through the secondary and tertiary unit commitment.Thus the combination would reduce the operational cost on the premise of ensuring system reliability and security.Simulation results of a province power system show that the operational cost is reduced and the effect is more significant with higher wind power penetration.
出处
《电力系统自动化》
EI
CSCD
北大核心
2013年第11期39-45,98,共8页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(51107007)~~
关键词
风电并网
多级机组组合
旋转备用
经济性
可靠性
wind power integration
multi-level unit commitment
spinning reserve
economy
reliability
