燃煤汽轮机发电机组背压变化的一次调频能力补偿

摘要

针对燃煤汽轮机发电机组一次调频能力受背压影响的问题,为了提高火电机组的一次调频性能,本文在传统汽轮机模型结构BPA的基础上,考虑背压对汽轮机出力的影响,建立了汽被压修正的数学模型.利用上述模型,在Matlab平台对该系统进行了汽轮机一次调频能力研究,分析了背压对汽轮机一次调频能力的影响规律,针对性设计了一次调频能力补偿方案,并进行了仿真验证,结果表明改善了机组一次调频性能,取得了预期的补偿量,对满足电网一次调频运行技术指标要求具有重要意义.%The primary frequency regulation performance of coal-fired steam turbine generator set was influenced by the backpressure.In order to improve the performance of primary frequency of thermal power unit,based on the traditional turbine model of BPA,considering the influence of backpressure on the output of steam turbine,this paper established the mathematical model of steam turbine with backpressure correction.Based on the above model,the primary frequency regulation performance of steam turbine was studied on the Matlab platform.This paper also analyzed the influence rules of backpressure on the primary frequency regulation performance of steam turbine,designed primary frequency regulation compensation scheme,carried out the simulation and improved the primary frequency control performance of the coil-fired unit.Finally the expected amount of compensation was gotten.It is of great significance to meet the requirements of the primary frequency control operation technical index.