Compensation control method for pressure correction control in turbine and furnace coordinated control system
A technology of coordinated control system and compensation control, applied in the field of automation, can solve the problems of pressure reduction, slowness, and increase of fuel volume in front of the machine, and achieve the effect of simple configuration, small parameter variation range, and good compensation control effect.
Active Publication Date: 2017-08-15
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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The control feature is that when the power generation load set value increases, the steam turbine side controller acts to increase the opening of the valve, the actual power generation load increases rapidly following the power generation load set value, but at the same time causes the pre-machine pressure to decrease rapidly, and the boiler side controller acts to increase the fuel consumption. amount, so that the front pressure of the machine slowly follows the machine to the set value of the front pressure
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[0026] A compensation control method for pressure pullback control in a machine-furnace coordinated control system, the specific implementation method is as follows:
[0027] The closed-loop structure of the furnace and machine coordinated control system is as follows: figure 1 shown. The machine-boiler coordinated control system based on the furnace-to-machine method can effectively use the heat storage of the boiler to quickly respond to the power generation load, but the process of using heat storage will lead to changes in the pressure before the machine, so it is necessary to increase the adjustment range of the boiler fuel volume to At the same time, it compensates for changes in power generation load and front pressure.
[0028] The pressure pullback control logic corrects the deviation of the power generation load through the deviation of the front pressure. After the pressure pullback control is activated, the closed-loop structure of the coordinated control system i...
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The invention discloses a compensation control method for pressure correction control in a turbine and furnace coordinated control system. According to pressure correction control logics of the turbine and furnace coordinated control system in the method, a generating load bias instruction signal calculated from a pressure deviation via a multi-point polygonal function is introduced into a gain compensation coefficient, calculated via another multi-point polygonal function, of a furnace-side controller, and the compensation coefficient in a product form is used to correct a deviated input signal of the furnace-side controller of the coordinated control system. The method of the invention aims at overcoming the disadvantages that a present pressure correcting control motion of the coordinated control system changes the system structure and weakens a control effect of the furnace-side controller for a steam pressure of a steam turbine.
Description
technical field [0001] The invention belongs to the technical field of automation, in particular to a compensation control method for pressure pullback control in a coordinated control system of a thermal power unit. Background technique [0002] At present and for a period of time in the future, my country's power supply will still be dominated by thermal power. It is necessary for thermal power units to improve operational flexibility to absorb various disturbances caused by large-scale grid-connected power generation sources with strong disturbances such as wind power. An index to measure flexibility The most important ones are the regulation range of power generation load and the speed of power generation load regulation. Restricted by the characteristics of the thermodynamic system, the ability of thermal power units to respond to changes in power generation load is relatively poor. Improving the response rate of power generation load will inevitably lead to poor operati...
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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 张锐锋田亮吴鹏刘鑫屏柏毅辉安波李前敏陈宇石磐何洪流李忠郑友卓黄如云
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD