140.What is Co-ordinate control mode?

In order to get the Optimum response of both Boiler Follow and Turbine Follow mode, as higher level control function called Co-ordinated Master Control is designed.In this configuration, CMC will be the main Load demand controller and will parallely sending demand for fuel from MWD as a feed forward signal to Boiler Master and the MWD to the Turbine Master in a Co-ordinate manner. This helps Boiler controls to take corrective measures, even before the PV is changed and at the same time Turbine control to quickly respond to load variations utilising the stored energy in the boiler. This mode is called as MW Control or Co-ordinated Boiler Follow Mode by Vendors. Sometimes it is necessary to operate plant in Co-ordinated Turbine Follow Mode ( BM - control MW and TM - control steam pressure). This mode helps to over come the large time lag in boiler.