| Coordinated control system provides a reliable guarantee for the safe,stable and economic operation of the thermal power unit.On the one hand,when the unit responses to load requirements,the coordinated control system makes full use of feed forward,feedback control,cascade control and so on,making the unit rapidly satisfy the requirement of electric load changes,and maintaining unit stable parameters;on the other hand,when unit breaks down,coordinated control system can cooperate with the unit's protection system,conducting the accident treatment automatically,and then avoiding the man-made wrong operations.A nutshell,the coordinated control system receive the power dispatching center's load instructions or operation personnel's load instructions,accepting the grid frequency offset signal,making the units have certain ability of pitch peaking and frequency modulation;At the same time,coordinated control system coordinate the supply and demand relations between the boiler and steam turbine,coordinating unit's each control subsystem,maintaining the stability of main steam pressure.Based on Zhejiang Energy Chang Xing Power Plant #2unit's DCS renovation projects,the article researches the GE Xinhua OC6000 e control system's hardware and software,getting the system function,working principle,working characteristic,at the same time grasping the related content of coordinated control system,and the control method,optimization method which coordinated control system uses,studying the unit's structure of the system,working process and principle.Finally,in view of the unit operation condition,combined with the DCS performance test,the load swing test,basic fixed value disturbance test,FSSS subsystem debugging test,RB test to test the control quality of the unit,then by the analysis of the experimental curve and data,optimize and correct the system logic and the parameters of the controller,thus improving the reliability of the coordinated control system. |
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