Design And Optimization Of 660MW Supercritical Unit Coordinated Control System

As national new energy develops, the proportion of wind and solar energy in power systems is gradually increasing. However, the traditional thermal power unit, as the main body of peak regulating, plays a much more important role in securing the operation of a power grid. Meanwhile, in order to ensure the quality of power supply as well as the stability of grid frequency, power grids involved in two rules formulating the specified load regulation performance of AGC unit requirements. Supercritical unit is complex to control with its multiple inputs and outputs, having characteristics of time delay and large inertia, mutual coupling between the control variables and nonlinear. Thus, a much advanced control method should be adopted in order to acquire the fine quality needed to regulate and ensure the safety and stability operation of the unit.By using the existing domestic model and taking the Jingneng Ningdong Power Generation Co. Ltd 660mw supercritical unit as an example, this paper set up a simplified nonlinear dynamic model object is fuel flow-feed water flow-turbine governor valve position and generation power-turbine throttle pressure-intermediate point enthalpy of the typical supercritical unit. Combining with the unit operation data the model parameters is fitted and the simulation on MATLAB is tested. The simulation results indicate that this model can reflect the actual site. Combined with the domestic mainstream control scheme, this paper analysiss the original design of a coordinated control system, and discovers the existing problem of unit coordinated control scheme. At the same time, the existing difficulties, the key points of coordinated control scheme and the optimized scheme are put forward. Based on many experiments, the coordinated control system parameters have been set, coordinated control system logic is optimized and the unit quality has been improved. Finally a safe and stable operation of the unit is realized and the AGC unit reaches the response goal of two rules.