A feedforward control method for steam temperature of thermal power unit

A feedforward control, steam temperature technology, applied in the control of superheat temperature, steam superheat, steam generation, etc., can solve the problems of poor quality and difficult control, and achieve the effect of simple debugging, improved effect, and improved control quality.

Inactive Publication Date: 2018-08-31
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The greater the inertia time of the object, the more difficult it is to control. Compared with the secondary superheated steam temperature, the control quality of the primary superheated steam temperature and reheated steam temperature is worse, and the fluctuation range can reach ±15°C and ±20°C under severe load changing conditions

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  • A feedforward control method for steam temperature of thermal power unit
  • A feedforward control method for steam temperature of thermal power unit

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Embodiment Construction

[0016] The first-stage superheated steam temperature of the thermal power unit is the outlet steam temperature of the panel superheater. The panel superheater is composed of two parts in series, the front panel and the rear panel. The inertia time of the object under rated load is about 200s~250s; The outlet steam temperature, the inertia time of the object under rated load is about 90s~110s; The object inertia time is around 340s ~ 420s. Because the inertia time of the object is small, the secondary superheated steam temperature is relatively easy to control.

[0017] The structure of the steam-water system and the air-flue gas system of the boiler determines that the disturbances received by the primary and secondary superheated steam temperature and reheated steam temperature control systems are basically the same, and the change trend of the steam temperature is basically the same when disturbed. In this way, there is the possibility of finding the feed-forward signal fro...

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Abstract

Provided is a feedforward control method for the steam temperature of a thermal power generating unit. According to the method, a deviation signal in front of a main controller of a boiler secondary overheating steam temperature control system is used as a feedforward signal of a primary overheating steam temperature and reheating steam temperature control system, and the feedforward signal is subjected to scaling operation and differential operation firstly, then subjected to high-low amplitude limiting processing, and superposed to a set value of the boiler primary overheating steam temperature and reheating steam temperature control system, so that feedforward control over the primary overheating steam temperature and reheating steam temperature is achieved. The deviation signal in front of the main controller of the boiler secondary overheating steam temperature control system is used as the feedforward signal of a primary overheating steam temperature and reheating steam temperature control system, so that a feedforward-feedback composite control system is formed, and not only is the control quality of the primary overheating steam temperature and reheating steam temperature under the variable-load working condition of the thermal power generating unit effectively improved, but also the control quality over the secondary overheating steam temperature is improved to a certain extent. In addition, the feedforward control method has the advantages of being simple in configuration and debugging and the like.

Description

technical field [0001] The invention relates to a feedforward control method for the temperature of primary superheated steam and reheated steam of a thermal power unit, belonging to the technical field of power generation. Background technique [0002] Large-scale thermal power unit boilers use water spraying to reduce temperature to adjust the temperature of the primary superheated steam (steam temperature at the outlet of the panel superheater), the temperature of the secondary superheated steam (the temperature of the steam at the outlet of the high-temperature The steam temperature at the outlet of the device), and the cascade or leading differential feedback control system is mostly used. As thermal power units frequently and significantly participate in power grid peak regulation and frequency regulation, the fluctuations in boiler fuel volume and steam flow will increase, resulting in poor control quality of the steam temperature control system. [0003] From the pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22G5/20
CPCF22G5/20
Inventor 田亮刘鑫屏卫丹靖王桐洪雨楠
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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