Coordinate Control System Of USC Unit Based On Identification By Using Genetic Algorithms

With the development of power industry, large capacity, high parameter generating unit has a rapid popularization, ultra-supercritical unit have begun to occupy the leading position in generating thermal power generating unit. Once-through boiler is a key feature of the ultra-supercritical unit. As a result of the supercritical unit's direct-current-operating characteristic, the variable-element-movement way, the multivariable-control characteristic, and the big differences comparing with the subcritical steam drum stove in the control aspect, therefore it has the profound significance in the safety-operation and the energy-conservation-consume of studying the USC unit's CCS.The unit power coordinate control system is the important part of electric power plant, control the boiler and steam turbine as a whole, has a variety of control functions, can satisfy the different operation modes and control requirements under different working conditions. While running, the turbine valve position, feed water and feed fuel's change will cause changes of the once through boiler's power, main steam pressure and temperature, and intermediate point's enthalpy. Therefore, the USC unit can be taken as a three input-output construed objects in this paper.Firstly this article analyzes the static and dynamic characteristics of boiler, expounds the coordinate control system in unit's function, classification and the movement way, introduces the main tasks of coordinated control system and the coordinated control strategy. Finally with the Beijiang power plant's first unit as the study object, gain the model framework by theoretical analysis and then use real-coded adaptive genetic algorithm to recognize the model parameter. In the typical working conditions, the static decoupling controllers of the coordinate control system can be schemed out by using the genetic algorithm. Then to design pressure circuit, power loop and enthalpy loop controller respectively for simulation. The results of simulation show that the coordinate control control system based on GA and decoupling control is effective to regulate and have a satisfactory control quality.