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Coal-fired power unit primary frequency modulation method based on estimating compensation control

A technology for thermal power generators and controllers, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as failure of the primary frequency regulation function to be put into normal operation, adverse effects on the safety and stability of the power system, etc., to improve primary frequency regulation performance, Improve the power response speed of the control system and avoid the effect of large changes

Active Publication Date: 2013-04-24
STATE GRID HUNAN ELECTRIC POWER CO LTD ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, not only the primary frequency regulation function cannot be put into operation normally, but it will also have an adverse effect on the safety and stability of the power system.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Control scheme configuration:

[0018] (1.1) Use the estimated compensation link to reflect the power variation of the steam turbine power closed-loop control system in advance: according to the relationship between the regulation stage pressure of the thermal power generation unit and the power of the thermal power generation unit, the relationship between the regulation stage pressure of the thermal power generation unit and the thermal power generation unit is established. The transfer function G(s) between unit powers, the structure of the transfer function G(s) is: where P E (s) is the Laplace expression of the thermal power generating set power, P Stage (s) is the pressure Laplace expression of thermal power generating set regulating stage; Determine the proportional coefficient K of thermal generating set regulating stage pressure and thermal generating set power according to G (s), the structure of described proportional coefficient K is: In the formula,...

Embodiment 2

[0025] Step (1) is the same as embodiment 1;

[0026] (2) In step (1), the grid-connected debugging of the thermal power generating set, after grid-connecting, use conventional methods to estimate the compensation link G of the thermal power generating set S (s), low-pass filter link L(s), power closed-loop controller G K (s) parameters for debugging;

[0027] (2.1) Determine the estimated compensation link G S (s) parameter: switch the steam turbine control system of the thermal power generating set to manual control, manually change the opening of the steam turbine regulating valve, and record the pressure signal of the regulating stage of the thermal generating set and the power change curve of the thermal generating set within 2 minutes , and then, using the conventional method, the transfer function G(s) in step (1.1) is obtained through the identification of the power change curve of the thermal power generating set, and the transfer function G(s) determines the relati...

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Abstract

The invention discloses a coal-fired power unit primary frequency modulation method based on estimating compensation control. The method comprises the following steps: (1) controlling solution configuration: (1.1) reflecting power variable quantity of a steam turbine power closed loop control system in advance by adoption of estimating compensation section; (1.2) sending power tolerance to a closed loop power controller GK (s) of a coal-fired power unit; (2) conducting on-grid adjustment and testing on the coal-fired power unit of the step (1): (2.1) confirming the parameters of the estimating compensation section GS (s); (2.2) adjusting the parameters of low pass filtering section L(s); (2.3) adjusting the parameters of closed loop power controller GK (s). The method can improve the first frequency modulation performance of the coal-fired power unit on the condition that main steam pressure is low or the valve flow functions are set improperly, and improves stable operation capacity of the coal-fired power unit.

Description

technical field [0001] The invention belongs to the technical field of thermal power generating sets, in particular to a method for primary frequency regulation of thermal generating sets based on estimation compensation control. Background technique [0002] Grid frequency is an important indicator of power quality. In grid frequency control, the role of primary frequency regulation is very important. It has achieved the purpose of stabilizing the grid frequency by quickly adjusting the output of thermal power generating units. In terms of primary frequency regulation of thermal power generating units, even though experts and scholars at home and abroad have conducted a lot of research, how to improve the regulation effect of thermal power generating unit primary frequency regulation is still an important topic in this field. At present, my country is vigorously building UHV AC and DC transmission systems. In the case of the introduction of a large number of UHV transmiss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/02
Inventor 盛锴
Owner STATE GRID HUNAN ELECTRIC POWER CO LTD ELECTRIC POWER SCI RES INST
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