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Method for improving primary frequency modulation performance of digital electric hydraulic (DEH) control system of turbine generator set

A steam turbine generator set and performance technology, which is used in the control of generators, electrical components, power transmission AC networks, etc., can solve the problems of low qualification rate of primary frequency regulation, prone to false frequency regulation, etc., and avoid the influence of synchronous transient power. Effect

Active Publication Date: 2019-05-24
ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The present invention provides a method for improving the primary frequency regulation performance of a turbo-generator set, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the primary frequency regulation pass rate of the existing turbo-generator set is low and prone to wrong frequency regulation question

Method used

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  • Method for improving primary frequency modulation performance of digital electric hydraulic (DEH) control system of turbine generator set
  • Method for improving primary frequency modulation performance of digital electric hydraulic (DEH) control system of turbine generator set

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Experimental program
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Embodiment 1

[0024] Embodiment 1: as attached figure 1 , 2 As shown, the method for improving the primary frequency regulation performance of the turbo-generator unit DEH includes the following steps:

[0025] S1: Use the grid frequency and the steam turbine speed signal as the input of the DEH system to detect the frequency difference Δf between the operating frequency and the rated frequency of the steam turbine generator set;

[0026] S2: Judging whether the frequency difference Δf exceeds the frequency difference dead zone ε, if it exceeds, the primary frequency modulation of the DEH system starts to act, and according to the frequency modulation dead zone ε and the difference coefficient, the calculated amount P of the main steam flow corresponding to the primary frequency difference 0 ; If it is not exceeded, the DEH system will not act on primary frequency modulation;

[0027] S3: The main steam flow P is given by the DEH system ref , the given main steam flow P ref As the targe...

Embodiment 2

[0040] Embodiment 2: as attached figure 1 , 2, as shown in Table 1, adopt the method of embodiment 1 to change the main steam flow corresponding to the primary frequency modulation slip of the 660MW unit DEH, and the primary frequency modulation data are as shown in Table 1; the 660MW unit of the present embodiment uses the frequency difference and the slip signal as The input signal of the DEH system, (1) judge whether the frequency difference signal reaches the dead zone of frequency difference ±0.03Hz; (2) when the frequency difference of primary frequency modulation is -0.15Hz, the frequency difference exceeds the range of the dead zone of frequency difference. The change of flow rate is 96t / h. When the absolute value of the frequency difference of the primary frequency modulation is greater than -0.15Hz, the limit of the unit’s primary frequency modulation plus load is +6%, and the change limit of the main steam flow is 96t / h; (3) when the frequency difference of the pri...

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Abstract

The invention belongs to the technical field of the primary frequency regulation of steam turbine generator set and relates to a method for improving the primary frequency modulation performance of the digital electric hydraulic (DEH) control system of a turbine generator set. The method includes the following steps that: S1, the frequency difference of the turbine generator set is detected; S2, whether the frequency difference exceeds a frequency difference dead zone is judged; S3, a main steam flow rate is given and is taken as the target value of the primary frequency modulation of the DEHcontrol system; S4, the control quantity of frequency signal change is converted into the output signals of the main steam flow rate, and the output signals of the main steam flow rate are outputted to a PID controller; S5, main steam flow rate control feedforward is solved; and S6, a main steam flow command is converted into a valve opening degree, the valve opening degree and a valve opening degree outputted by the main steam flow rate control feedforward are summated, so that comprehensive valve opening degree signals are generated. According to the method of the invention, the main steam flow rate is controlled through the closed-loop control of the DEH control system, so that power generated by the primary frequency modulation of the DEH control system includes two parts, wherein onepart is power generated by main steam flow change, and the other part is synchronous transient power generated by rotational speed signal change; and the main steam flow rate is controlled and regulated, so that the primary frequency regulation performance of the DEH control system of the steam turbine generator set is restored to normal.

Description

technical field [0001] The invention relates to the technical field of primary frequency regulation of a steam turbine generator set, and relates to a method for improving the primary frequency regulation performance of a turbogenerator set DEH. Background technique [0002] At present, the grid frequency is an important indicator of power quality. The frequency of the grid reflects the balance between the active power of the generator and the load, and is an important control parameter for the safe and stable operation of the power system. Improving the DEH primary frequency regulation performance of the turbo-generator set is of great significance to ensure the safe and stable operation of the frequency of the large power grid and to improve the power quality of the power system. [0003] Before the 1990s, small and medium-sized turbogenerators in power grids all over the country were all liquid-regulated (mechanical hydraulic control system (MHC)) turbogenerators with a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/34H02P9/04
Inventor 韩刚
Owner ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER