Coal-fired unit source network win-win frequency adjusting method based on UCPS

A coal-fired unit and source network technology, applied in the direction of AC network circuit, single network parallel feeding arrangement, electrical components, etc., can solve the problems of control deviation and failure to adapt to the control system of generating units, so as to improve the control quality and benefit Safety and the effect of improving frequency quality

Active Publication Date: 2014-07-09
SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 3) UCPS2 measures the control deviation of the unit
[0017] Although there are already some UCPS evaluation methods for generator sets, they have not yet adapted to the UCPS standard generator set control system.

Method used

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  • Coal-fired unit source network win-win frequency adjusting method based on UCPS
  • Coal-fired unit source network win-win frequency adjusting method based on UCPS

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Effect test

Embodiment

[0052] For coal-fired units, even if the amount of fuel in the boiler remains unchanged, the energy of the boiler changes randomly due to coal quality changes and other reasons, and often fails to reach a balanced state. In the AGC mode with frequent load changes, the energy of the unit has less chance to reach a balanced state. . When unbalanced, there is a deviation between the output electric energy of the unit and the heat energy of the boiler.

[0053] The power load of the power grid is always changing. With the change of uncontrollable power sources such as wind power and photovoltaics, the power generation and power consumption are often in an unbalanced state, and the frequency of the power grid has a corresponding deviation. Power balance.

[0054]Coal-fired units with more energy when the grid is slightly low frequency and less energy when the grid is slightly high frequency undertake these slight frequency modulation tasks, change output in time to balance grid en...

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Abstract

The invention relates to a coal-fired unit source network win-win frequency adjusting method based on a UCPS. The method includes the following steps that firstly, when power grid frequency is smaller than a set low frequency value or ACE is smaller than an allowable value, a control system makes generator unit locking or weakening output be reduced; secondly, when the power grid frequency is higher than a set high frequency value or the ACE is smaller than the allowable value, the control system makes the generator unit locking or weakening output be increased; thirdly, when the power grid frequency is smaller than the set low frequency value or the ACE is smaller than the allowable value, the unit with high energy releases energy so as to reach to a balance state, and meanwhile outputs more electric energy to a power grid; fourthly, when the power grid frequency is higher than the set high frequency value or the ACE is smaller than the allowable value, the unit with low energy accumulates energy so as to reach to the balance state, and meanwhile outputs less electric energy to the power grid. Compared with the prior art, the coal-fired unit source network win-win frequency adjusting method has the advantages that under the condition that safety of coal-fired units is guaranteed, power grid power and frequency control auxiliary service requirements are met, and meanwhile stable and economical operation of the generator units is kept.

Description

technical field [0001] The invention relates to a source-network frequency modulation method of a coal-fired unit, in particular to a UCPS-based source-network frequency modulation method for a coal-fired unit. Background technique [0002] At present, the power control auxiliary service of generator sets is generally based on the accuracy of generator output tracking dispatching instructions as the main evaluation basis. Regardless of whether it is beneficial or harmful to the safe operation of the power grid, the control behavior that deviates from the dispatching instructions must be punished. [0003] In order to meet the requirements of power grid frequency regulation and AGC auxiliary services, the "furnace follower" control method is generally used to ensure that the unit has good AGC power following performance. Since the boiler thermal power has a large response delay to coal combustion, it is difficult to achieve the unit energy The timely balance of the unit caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/38
Inventor 沈从奇归一数姚峻程际云
Owner SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG
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