考虑煤耗率的火电机组灵活调峰对风电消纳的影响效果研究

火电机组灵活调峰是提高电网中风电消纳的重要手段之一，然而火电机组在灵活调峰运行时的煤耗率较其正常运行模式有所提高，现有电网调度模型未考虑该特性。本文采用分段线性函数表示考虑煤耗率的火电机组发电费用函数，建立灵活调峰火电机组与风电机组的日前机组组合优化模型，该模型采用现有线性规划方法进行求解。最后采用实际风电机组和火电机组数据基于IEEE-30母线系统进行验证。结果表明，本文提出的分段线性函数可以较好地拟合机组煤耗率与出力的关系；火电机组深度调峰运行时煤耗率较其正常运行有所提高。本文计算方法有助于降低系统运行总费用，提高电网中的风电消纳量。

Effect of flexible load regulation of thermal power units considering coal consumption rate on wind power utilization

Flexible load regulations of thermal power units are one of the key approaches to increase the wind power utilization in power systems.Power units under flexible load regulations have higher coal consumption rates than those in normal operating modes,while such characteristics are not captured by existing power system dispatch models.In this paper,a unit commitment model considering thermal power units in flexible load regulations is presented,and coal consumption rates of flexible units are characterized by using piecewise linear functions.The model is solved by using existing mixed integer linear programming(MILP)methods.Then,numerical examples on the IEEE 30-bus system with practical wind farm and thermal power unit data are presented.The verification results demonstrate that,the flexible load regulations of thermal power units can substantially improve the wind power utilization and reduce the generation costs.