Steam pressure equalization controller for boiler-turbine unit
A steam turbine unit and controller technology, which is applied in the control system, steam engine device, machine/engine, etc., can solve the complex structure of neural network, the coupling relationship between steam pressure and unit output power is not fully considered, and it is difficult to ensure the stability of steam pressure, etc. question
Inactive Publication Date: 2010-09-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
However, from the perspective of engineering application, there are two problems in this study: first, the main steam pressure is regarded as an isolated system for control system design, and the coupling relationship between steam pressure and unit output power is not fully considered , the steam pressure is controlled only by adjusting the amount of fuel entering the furnace, and there is no limit to the opening of the main steam regulating valve. If the load demand of the power grid changes in a large range, this method will be difficult to ensure the stability of the steam pressure; second, The neural network structure based on the control system in this paper is complex, there are many unknown parameters and the physical meaning is not clear, and there are a large number of parameters that need to be determined by means of optimization
Therefore, this method is difficult to implement in industrial control systems, and the practical value is not high
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[0062] Example: image 3Shown is a nonlinear model of a 500MW boiler-turbine unit in a power plant. The rated parameters of the unit are: main steam pressure 16.18Mpa, drum pressure 18.97Mpa, main steam flow 1650t / h, output power 500MW. The fuel quantity B% and the opening degree of the main steam regulating valve μ% satisfy the speed and amplitude limits respectively: |dB / dt|≤1.0 / s, 0.0≤B≤100.0 and 0.0≤μ≤100.0. Based on above-mentioned model, apply the method that the present invention provides to realize the steam pressure equalization control of boiler-steam turbine unit, concrete implementation steps are as follows:
[0063] 1) First, design the machine-furnace coordination controller of this model according to the linear decoupling control theory:
[0064] B μ T = 6.91 ...
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The invention discloses a steam pressure balance controller of a boiler-turbine unit, and belongs to the technical field of generating equipment control. The controller consists of a pressure difference compensator and a pressure setting point optimizer, wherein the pressure difference compensator dynamically adjusts the speed and the direction of the load command change according to the size of a stream pressure deviation signal PE and generates an actual load target value NR; and the pressure setting point optimizer dynamically adjusts a setting valve of the steam pressure under the drivingof the steam pressure deviation signal PE and generates an actual steam pressure target value P TR. Values of differencing the N R and an actual load signal N and differencing the P TR and an actual steam pressure deviation signal P TR respectively are used as input of a boiler-turbine coordinated controller to achieve the steam pressure balance control of the boiler-turbine unit. The steam pressure balance controller is arranged on the basis of the conventional boiler-turbine coordinated control so as to conveniently and effectively solve the problem that the steam pressure is frequently transfinite when the output power of a machine unit changes in a large scope, achieve the balance control of the steam pressure and improve the operation level of the machine unit.
Description
technical field [0001] The invention belongs to the technical field of equipment control, in particular to a steam pressure equalization controller of a boiler-steam turbine unit. Specifically, it is an optimization controller driven by a steam pressure deviation signal, composed of a pressure difference compensator and a pressure set point optimizer, and aimed at ensuring a stable and balanced steam pressure. Background technique [0002] Boiler-turbine unit has become the most popular and commonly used generator set in China. Its typical features are: a single boiler (subcritical, supercritical, circulating fluidized bed, biomass boiler, etc.) prepares steam and supplies a single A steam turbine, and then the steam turbine drives a generator to generate electricity. A boiler, a steam turbine, a generator and related auxiliary equipment together constitute a unit generator set. [0003] Boiler-turbine units have proven to be the most efficient and economical form of fossi...
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IPC IPC(8): F22B35/00F22B35/18F01K11/02
Inventor 房方魏乐刘吉臻谭文
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)