CAJ | 학술논문

针对目前大型单元火电机组运行中功频调节对锅炉汽压有不稳定因素的现象，分析指出了DEH控制系统采用不同的控制方式对锅炉对象动态特性的影响具有本质的区别，DEH控制系统为功频调节时机组锅炉汽压对象表现为无自平衡过程，DEH控制系统为纯速度调节时为有自平衡过程，并通过仿真给出了燃料扰动和负荷扰动对采用不同DEH控制系统的单元火电机组动态特性的影响，最后提出了机组工况不稳定或外干扰频繁时机组的运行方式，这对大型单元火电机组安全运行具有重要的现实意义
침대목전대형단원화전궤조운행중공빈조절대과로기압유불은정인소적현상，분석지출료DEH공제계통채용불동적공제방식대과로대상동태특성적영향구유본질적구별，DEH공제계통위공빈조절시궤조과로기압대상표현위무자평형과정，DEH공제계통위순속도조절시위유자평형과정，병통과방진급출료연료우동화부하우동대채용불동DEH공제계통적단원화전궤조동태특성적영향，최후제출료궤조공황불은정혹외간우빈번시궤조적운행방식，저대대형단원화전궤조안전운행구유중요적현실의의
In view of the presence of destabilizing factors in boiler steam pressure caused by the power-frequency control of current large-sized mono-block thermal power plant units the authors have performed an analysis of the digital electric-hydraulic (DEH) control modes. It is noted that there exists a substantial difference in the influence on the dynamic characteristics of a boiler object when various DEH control modes are put into use. In case the DEH control assumes the form of power-frequency one the boiler steam pressure as a controlled object can be viewed as a self balancing-absent process. When the DEH control functions as a pure speed regulation, the former represents a self-balancing process. By way of simulations the effect of fuel and load perturbations on the dynamic characteristics of a mono-block thermal power plant unit has been determined when different DEH control modes are used. At the end of the paper presented are the operating modes of the mono-block unit under unstable working conditions or in case of a high frequency of outside perturbations. In sum, the paper has provided some hints of highly practical value for ensuring the safe operation of large-sized mono-block thermal power plants.