330MW机组协调控制系统优化设计与改造

发布时间：2018-10-18 15:37

【摘要】：协调控制系统(CCS,Coordinated Control System)为火电机组的安全、稳定、经济运行提供了可靠的保证。一方面,在机组响应负荷变化时,协调控制系统充分利用前馈、反馈、串级控制等控制技术,保证机组迅速满足电网负荷变化要求,维持机组参数稳定;另一方面,在机组发生故障时,协调控制系统能与机组保护系统配合,自动进行事故处理,避免发生人为误操作。概括来讲,协调控制系统接受来自调度的负荷指令或者运行人员负荷指令,接受电网频差信号,使机组具有一定的调峰、调频能力;同时协调控制系统协调锅炉与汽轮机之间的能够供求关系,协调机组各控制子系统,维持主汽压力的稳定。本文基于浙能长兴电厂#2机组DCS改造项目,对GE新华OC6000e控制系统硬件、软件进行研究,了解该系统功能、工作原理、工作特性,同时掌握协调控制系统相关内容,以及协调控制系统所应用的控制方法、优化手段,对该机组各个系统的结构、工作过程及原理进行研究。最终,针对该机组运行工况,结合DCS基本性能试验、负荷摆动试验、定值扰动试验、FSSS子系统调试试验、RB试验等对该机组控制品质进行检验,通过对试验曲线、数据的分析,优化和修正相应系统的逻辑组态、控制器参数,从而提高该机组协调控制系统可靠性。
[Abstract]:The coordinated control system (CCS,Coordinated Control System) provides a reliable guarantee for the safety, stability and economic operation of thermal power units. On the one hand, the coordinated control system makes full use of feedforward, feedback, cascade control and other control techniques to ensure that the unit can meet the requirements of power network load change quickly and maintain the stability of unit parameters when the unit responds to load changes; on the other hand, the coordinated control system makes full use of feedforward, feedback, cascade control and other control techniques. When the unit fails, the coordinated control system can cooperate with the unit protection system to deal with the accident automatically and avoid human error. Generally speaking, the coordinated control system receives the load instruction from dispatch or the operator load instruction, and receives the frequency difference signal of the power network, so that the unit has the ability of peak shaving and frequency modulation. At the same time, the coordinated control system coordinated the supply and demand relationship between boiler and steam turbine, coordinated the control subsystems of the unit, and maintained the stability of the main steam pressure. Based on the DCS transformation project of # 2 unit in Changxing Power Plant, this paper studies the hardware and software of GE Xinhua OC6000e control system, understands the function, working principle, working characteristics of the system, and grasps the related contents of the coordinated control system. The structure, working process and principle of each system of the unit are studied as well as the control methods and optimization methods used in the coordinated control system. Finally, combined with DCS basic performance test, load swing test, fixed value disturbance test, FSSS subsystem debugging test, RB test and so on, the control quality of the unit is tested, through the analysis of test curve and data. The logic configuration and controller parameters of the corresponding system are optimized and modified to improve the reliability of the coordinated control system of the unit.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621

【参考文献】