摘 要:本文论述通过现状调查,找出影响AGC正常投入的两个主要问题,即系统故障率高和调节不及时,采用头脑风暴法进行原因分析和要因确认,针对料位组态方案不符合实际情况、风量信号偏差大、旁路风调节频繁、热风挡板执行机构安装位置不合适、ADS信号不稳定,无监视手段,MEH控制柜不浮空、指令无冗余、软件版本低、无专用接地网、二次风量自动闭锁一次风量操作等情况,先后完成了用热一次风流量来修正料位信号,二次风量引出管移到距中心200mm处,旁路风挡板最大开到35%,热风门执行机构输出轴加长 200mm,MEH机柜与底座绝缘,DPU版本由RO4SP3升级到RO4SP3+,安装DPU补丁文件VIO.DLL,制作专用接地网,解除二次风量自动闭锁一次风量操作等项目。
Summary :This article elaborates through the present situation investigation,discovers affects the AGC normal investment two main questions, namely the system failure rate high and the adjustment is not prompt, Uses the brains storm law to carry on the reason analysis and to want because to confirm, does not conform to the actual situation, the amount of wind deviation of signal in view of the material byte condition plan in a big way, The bypass wind adjustment frequent, the hot blast back plate implementing agency installs the position not not appropriately, the ADS signal is unstable, does not have the surveillance method, The MEH control cabinet floats spatially, the instruction does not have the redundancy, The software edition is low,does not have situation and so on special-purpose counterpoise,Completed successively revised the material position signal, two amount of wind fairleads with the hot wind current capacity transfers to is apart from central 200mm place, The bypass wind back plate arrives 35%, The hot air throttle implementing agency output shaft most greatly lengthens 200mm, The MEH cabinet and the foundation insulation, the DPU edition promotes from RO4SP3 to RO4SP3+, installed DPU patch document VIO.DLL, Project and so on manufacture special-purpose counterpoise.
Keywords: AGC.CCS.Function
1 概述
根据调度中心要求,菏泽电厂#1、2、3、4机组的一次调频及AGC功能应有计划地进行调试,逐步达到投运条件,并按照调度中心的命令,投停这些功能,为更好地完成这项工作,3月份注册成立菏泽电厂主控技术创新小组,承担#4机组AGC功能完善和调试投运工作。
主控技术创新小组检查接收中调指令的通讯接口系统,确保中调指令正确及时地以4~20MA.DC的信号进入DCS系统,逐步投入以下主要系统的自动调节回路:主蒸汽压力系统、锅炉给水调节系统、主蒸汽温度调节系统、再热蒸汽温度调节系统、炉膛压力调节系统、送风及二次风调节系统、一次风压调节系统、制粉各调节系统、汽包水位调节系统。在各回路自动调节系统工作稳定后,投入协调控制系统机炉协调方式,当机组协调控制投入稳定后,先做负荷扰动试验,待调节品质符合要求后,然后进行AGC试验:
检查机组适应负荷指令要求变化的能力,使机组能够在一定的负荷范围内,按一定的速率跟踪中调要求的负荷指令出力;机组启动后,AGC应正常运行,具备带满负荷、安全稳定运行的能力;协调控制系统的各种功能经过试验投入运行,各模拟量控制系统投入自动运行,调节品质达到机组要求,试验在中调要求的负荷范围内的正常工况下进行,图1为AGC指令形成过程。
来源:中国国电集团公司菏泽发电厂