Coordinated control system of thermal power generating unit and coordinated control method of coordinated control system

A technology for coordinating control systems and thermal power units, applied in general control systems, control/regulation systems, electrical program control, etc., can solve problems affecting the safe and stable operation of unit units, overpressure or long-term low pressure, and other parameters exceeding limits , to achieve the effect of ensuring stability, improving stability, and satisfying load response speed

Inactive Publication Date: 2019-03-19
ORDOS VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of the prior art, the present invention provides a thermal power unit coordinated control system and its coordinated control method, which solves the problem that the coordinated control strategy of the prior art cannot meet t

Method used

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  • Coordinated control system of thermal power generating unit and coordinated control method of coordinated control system
  • Coordinated control system of thermal power generating unit and coordinated control method of coordinated control system
  • Coordinated control system of thermal power generating unit and coordinated control method of coordinated control system

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Embodiment 1

[0048] see figure 1 as well as figure 2 , the inventor of this case has conducted detailed and in-depth research. In the prior art, the coordinated control objects of thermal power unit units are mainly steam turbines and boilers. While the unit responds quickly to the load, the deviation of the main steam pressure must be controlled within the normal range. However, the thermal power unit is composed of multiple systems, and the energy conversion links generally include coal yards, pulverizing systems, furnaces, water walls, steam turbines, and generators. and other components, the chemical energy in the coal in the coal yard is transported through the pulverizing system to the boiler for combustion to generate heat, and the heat is transferred to the water wall, and the water in the water wall turns into steam to generate thermal potential energy, and then the steam Work is done by the steam turbine, which converts the thermal potential energy into mechanical energy, and t...

Embodiment 2

[0115] This embodiment provides a coordinated control method for thermal power units on the basis of Embodiment 1. The coordinated control method for thermal power units includes:

[0116] Take the load command N of the thermal power unit 0 As a feed-forward signal, it drives the main controller of the boiler to act in advance, and opens or closes the high-profile door of the steam turbine in response to the load command N 0 ; make the feedforward signal act on the main controller of the boiler, increase or decrease the fuel volume and air volume, and perform step control on the boiler;

[0117] Compensating the dynamic delay of the boiler according to the steam pressure deviation ratio, so as to adjust the fuel quantity of the boiler;

[0118] Correcting the main controller of the boiler according to the deviation of the main steam pressure to adjust the combustion rate of the boiler.

Embodiment 3

[0120] In this embodiment, in the coordinated control system of thermal power units, the coordination mode of the feedback signal is the boiler following control mode, and the coordination mode of the feedforward signal is the power command indirect energy balance as the main mode, and the direct energy balance of the boiler as the auxiliary combined control method.

[0121] see Figure 7 , in the boiler following control mode, the steam turbine controls the load power of the unit, and the boiler controls the main steam pressure. When unit load command N 0 When increasing (i.e. N 0 -N E >0), so that the main controller of the steam turbine Wa1(s) issues an instruction to increase the opening of the steam turbine regulating valve, thereby increasing the flow of main steam entering the steam turbine, and finally making the actual load of the unit N E with load instruction N 0 same. The change of the main steam flow rate causes the main steam pressure P T Change, at this t...

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Abstract

The invention discloses a coordinated control system of a thermal power generating unit and a coordinated control method of the coordinated control system. The coordinated control system of the thermal power generating unit is used for driving a boiler and a steam turbine inside the thermal power generating unit, and comprises a boiler main controller, a feedforward control module and a steam turbine main controller. The boiler main controller drives a feedback adjustor PID of the boiler main controller to conduct control operation according to a deviation signal between main steam pressure and a preset pressure, so that the deviation value of the deviation signal is zero. The feedforward control module increases response speed of the boiler through two or more feedforward signals to compensate for the inertia of the boiler. The steam turbine main controller processes the deviation signal when the deviation value of the deviation signal exceeds a preset deviation value so that the deviation value can be decreased. The conflict between rapidness of adjustment of the steam turbine and delay of adjustment of the boiler is eliminated, the demand for unit load response speed is met to the maximum degree, and the operating stability of the thermal power generating unit is improved.

Description

technical field [0001] The invention relates to a coordinated control system and method in the technical field of automation control, in particular to a thermal power unit coordinated control system and a coordinated control method thereof. Background technique [0002] The Coordinated Control System (CCS for short) is to meet the load requirements of the power grid dispatching center. The operation controllers of the steam turbine and boiler in the unit unit are combined according to their respective dynamic characteristics through different calculation methods and design strategies. create organic connections between them. CCS can quickly and automatically adjust the steam turbine control valve, boiler fuel volume, air volume, and water supply volume, respond to load commands in a timely manner and maintain the stability of the main steam pressure; Load reduction (Run Back, RB for short) and other means can automatically handle accidents to ensure safe, stable and economi...

Claims

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Application Information

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IPC IPC(8): G05B19/418
CPCG05B19/4184Y02P90/02
Inventor 屈原李波马俊峰
Owner ORDOS VOCATIONAL COLLEGE
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