660MW燃煤机组热力系统构型调整对一次调频性能的影响研究

Improving characteristics of primary frequency control on coal-fired power system is an effective way to increase operational security of the power grid. In this study, the dynamic models of thermal system and models of primary frequency control on a 660MW coal-fired power plant were developed by the GSE soft ware. Dynamic characteristics of the main thermal parameters was obtained, and the effects on the performance of primary frequency control at different measures of regulating thermal system configuration were analyzed and compared. The results reveal that compared with throttling extraction steam of low-pressure heaters (TESLPH) and condensate water bypass of low-pressure heaters (CWBLPH), the effects on the parameters of live steam, reheat steam, and feedwater at throttling extraction steam of high-pressure heaters (TESHPH) and feedwater bypass of high-pressure heaters (FWBHPH) is greater. With respect to the load change potential, the most regulation amplitude of output power is 48.1MW at TESHPH measure, the fastest regulation rate of output power is at TESLPH measure and the required time is 52s. With respect to the performances of primary frequency control, with regard to the rapidity, the best measure is TESHPH and the regulating time is 31s. With regard to the unbiasedness, the best measure is TESLPH and the regulating deviation ratio is 8.1%. With regard to the effectiveness, the best measure is FWBHPH and the regulating efficiency is 59.8%. Moreover, with increasing the degree in frequency disturbance, the rapidity and effectiveness reduce, and the unbiasedness enhances.