Balance tracking control method for flexible coordinated control system

The invention provides a balance tracking control method for a flexible coordinated control system. According to the balance tracking control method for the flexible coordinated control system, in thecontrol process of a thermal power generating unit adopting the flexible coordinated control system, a tracking period is set at intervals of a certain number of control periods, flexible factors areallowed to change during the tracking period, boiler side control output and turbine side control output remain unchanged, all boiler side controllers track boiler side control output signals, all turbine side controllers track turbine side control output signals, and in the other control periods, flexible factor signals remain unchanged. By means of the balance tracking control method for the flexible coordinated control system, balance tracking control logic is added in the flexible coordinated control system, disturbance caused by flexible factor change to the control system is eliminatedcompletely, and no observab