供热机组热电负荷解耦控制

Thermal and Electric Load Decoupling Control of Heat Supply Units

为了满足风电大规模并网条件下电网对供热机组投入AGC运行的需求,机组热、电负荷控制系统相互耦合的问题需要得到解决。对供热机组的非线性动态模型进行小偏差线性化,得到传递函数矩阵模型,分析发现供热侧对发电侧的扰动主要由两类供热调节蝶阀开度到机组发电负荷的通路引起。在以炉跟机为基础的协调控制系统中加入蝶阀开度对发电负荷的解耦器,仿真实验证明解耦环节可以在不影响机前压力控制品质的同时显著减小机组发电负荷的波动。

Under the condition of large-scale integration of wind power, this paper studied on coupling characteristic of the control system of thermal and electric load in order to realize automatic gain control(AGC) in heat supply units. This paper gained transfer function matrix model by small deviation linearization, which was derived from a nonlinear dynamic model of heat supply units. Analysis showed that the disturbance caused by the heating side is mainly driven by the path from the opening of two kinds of heat regulation butterfly valve to the generating load. This paper integrates the decoupler from the opening of butterfly valve degree to the generating load with the coordinating control system under the condition of boiler-following mode. The simulation experiment indicates that the decouplers can obviously stabilize the fluctuation of generating load without affecting the control quality of the throttle pressure.