火电机组的工况自适应协调控制策略

Condition-adaptive Coordinated Control Strategy to Operation Conditions of Coal-fired Power Unit

随着火电灵活性改造的进行,火电机组需要在大范围变工况下运行,运行过程中需要兼顾机组低负荷稳定性。因此提出了一种工况自适应协调控制策略,该策略以柔性控制为基础,设计了协调控制系统工况自适应控制结构,并提出了控制系统参数确定方法。在仿真实验中,首先分析比较了某一工况下不同柔性因子作用后的控制效果,然后利用蒙特卡洛模拟,分析了参数不确定性对该控制系统稳定性的影响,在大范围变工况下对该策略的控制效果进行了仿真验证。仿真结果显示该策略设计方法可以实现机组在大范围变工况下稳定性与调峰快速性的综合协调,同时结构改造简单,控制器参数易获得,便于现场实施,为低负荷下的协调系统控制策略设计提供了一种思路。

With the flexibility modification of coal-fired plant units,the units need to operate under large-scale operating conditions and low-load stability of the units needs to be taken into account during operation.Hence,a condition-adaptive coordinated control strategy to operation conditions is proposed.Based on the flexible control,the condition-adaptive control structure of the coordinated control system is designed and a method for determining the parameters of the control system is proposed in this strategy.In the simulation experiment,the control effects under a certain operating condition with different flexible factors are compared and analyzed.Then,the influence of parameter uncertainty on the stability of the control system is analyzed by Monte Carlo simulations and the control effect of the strategy is verified under large-scale variable operating conditions.The simulations verify that the coordinate between the stability and rapidity of unit under large scale working conditions can be achieved by proposed strategy.the proposed strategy can coordinate.Meanwhile,the structure modification is simple and the controller parameters are easy to be obtained,which is convenient for the field application.The results can help the design of control strategy in low load.