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Thermal power plant main steam pressure control method

A main steam pressure and pressure control technology, which is applied in the direction of electric fluid pressure control, fluid pressure control, non-electric variable control, etc., can solve the problems of frequent fluctuations in main steam pressure, and achieve the effect of improving the performance of AGC and primary frequency modulation

Pending Publication Date: 2021-07-13
NORTHWEST BRANCH OF CHINA DATANG CORP SCI & TECH RES INST
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Problems solved by technology

[0015] The purpose of the present invention is to provide a method for controlling the main steam pressure of a thermal power plant, which solves the problem of frequent fluctuations of the main steam pressure under the steady state of the unit load

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  • Thermal power plant main steam pressure control method
  • Thermal power plant main steam pressure control method
  • Thermal power plant main steam pressure control method

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Embodiment Construction

[0043] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] To solve the problem of frequent fluctuations of the main steam pressure, it is necessary to solve the problem of the balance point of the fuel quantity of the unit under different coal qualities. The invention provides a method for controlling the main steam pressure of a thermal power plant such as figure 2 As shown, it includes adding a feed-forward value to the main control PID controller of the boiler, that is, the feed-forward PID controller. The feed-forward PID controller includes a PID calculator with pure integral action and a PID input control module based on it and a PID The calculation module moves the balance point of the fuel quantity through the feed-forward PID controller to accumulate the deviation of the main steam pressure. in:

[0045] (1) PID input control module

[0046] Main steam pressure deviation: Δ=SP-PV...

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Abstract

The invention discloses a thermal power plant main steam pressure control method which comprises the steps that a feedforward PID controller is additionally arranged on a boiler master control PID controller, and the feedforward PID controller comprises a PID calculator with a pure integral effect, a PID input control module based on the PID calculator and a PID operation module based on the PID calculator. The feed-forward PID controller is used for carrying out fuel quantity balance point movement on the main steam pressure deviation accumulation. According to the thermal power plant main steam pressure control method, the feed-forward PID controller is a PID calculator based on the pure integral effect, coal quantity migration can be stabilized at a new balance point according to the main steam pressure deviation, and a decisive effect is achieved for reducing frequent fluctuation of the main steam pressure; and in the heat supply period of the thermal power generating unit, the main steam pressure can be well maintained when the load is stable, and the AGC and primary frequency modulation performance of the unit can be improved.

Description

technical field [0001] The invention belongs to the technical field of a main steam pressure control method of a large-scale thermal power generating set, and in particular relates to a main steam pressure control method of a thermal power plant. Background technique [0002] The main steam pressure is one of the most important control parameters of large thermal power generating units, which has the characteristics of large delay and large inertia. The general method for the control of main steam pressure is based on the combination of PID controller and differential feedforward mode, which can better solve the problem of large fluctuations in main steam pressure when the load of the unit changes, but it is difficult to solve the main steam pressure under the condition of stable load of the unit. Small fluctuations are less effective. [0003] After the thermal power generation unit is put into CCS (Coordinated Control System), the main steam pressure control is completed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D16/20
CPCG05D16/2026Y02P90/02
Inventor 刘永红张晓航
Owner NORTHWEST BRANCH OF CHINA DATANG CORP SCI & TECH RES INST
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