掺烧褐煤机组一次调频性能优化

Primary Frequency Regulation Performance Optimization for Mixed-Burning with Lignite Unit

针对掺烧褐煤机组参与电网一次调频时出现负荷响应滞后、积分贡献电量超标、经常出现反向调节的问题,通过分析试验数据及现场调试,提出了掺烧褐煤机组有关一次调频的优化控制方案,总结出一次调频优化调试过程中的技术要点,如汽轮机转速测量精度等。优化后的控制方案涉及到数字电液控制系统(DEH)、协调控制系统(CCS)等子系统,增加了DEH中一次调频前馈分量的实际负荷指令非线性修正,汽机主控中主汽压力偏差动态分离,即当一次调频动作时,汽机调门不会因压力偏差大而出现反向调节,导致积分电量超标。优化后的控制方案通过现场全负荷段的一次调频模拟试验和实际运行检验,达到了比较理想的效果。

Load response lag for lignite-fired units to participate in the grid frequency regulation,the integral contribution of electricity exceeded,the reverse problem of adjusting occurs frequently,blended with lignite units related to the primary frequency optimization control scheme is proposed by analyzing the experimental data and site adjusting,such as the turbine speed measurement accuracy.Optimized control programs related to digital electro-hydraulic control system（DEH）,coordinated control system（CCS）subsystem,an increase of the nonlinear correction of DEH in FM feedforward component of the actual load instruction,the main steam turbine master pressure deviation of dynamic separation,when the primary frequency regulation action,the steam turbine valve will not reverse pressure deviation adjustment,leading to excessive integral power.Through full load primary frequency regulation analog test and the actual running test,the result of which is satisfactory.