论文部分内容阅读
针对大型火电机组频繁参与电网调峰以及煤质不稳定导致机组燃烧扰动增多,使得协调控制系统控制品质下降的问题,提出了利用风量、氧量构造热量信号,并将此信号经过微分后引入炉侧调节器,构成导前微分协调控制系统的改进方案,同时给出补偿法整定微分增益的方法,采用机组通用简化非线性动态模型利用相对增益矩阵法在系统耦合特性和等效对象特性之间进行衡量和比较,选取适合的等效对象,计算得到微分增益.结果表明:导前微分协调控制系统能够改善系统的控制品质,减小负荷变化对机前压力的扰动,有效克服制粉系统和燃料发热量变化扰动.
In view of the frequent participation of large thermal power units in power grid peaking and instable coal quality resulting in increased combustion disturbance in the unit, the control quality of the coordinated control system is reduced. A heat signal is constructed by using the air volume and the oxygen amount. The differential signal is introduced into the furnace Side governor to form the improved scheme of the derivative differential coordination control system, meanwhile, a method of compensating the differential gain is given. The general simplified nonlinear dynamic model of the unit is used to calculate the coupling gain between the system coupling characteristic and the equivalent object characteristic by the relative gain matrix method The results show that the derivative differential control system can improve the control quality of the system and reduce the disturbance of load variation on the pressure before the machine to effectively overcome the problems of the pulverizing system and Fuel heat disturbance changes.