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Primary Frequency Modulation Two-way Slip Power Correction Control Method for Thermal Power Generating Sets

A thermal power generation unit and control method technology, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as inaccurate, difficult frequency modulation power response, etc., to achieve the effect of ensuring rapidity

Active Publication Date: 2021-05-14
ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a thermal generator set primary frequency modulation two-way slip power correction control method, which overcomes the deficiencies of the prior art above, and can effectively solve the problem that the existing single slip function and single power correction function cooperate with each other, which is difficult to solve the problem of steam turbine The problem of inaccurate power response of primary frequency modulation of units with large valve nonlinearity

Method used

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  • Primary Frequency Modulation Two-way Slip Power Correction Control Method for Thermal Power Generating Sets
  • Primary Frequency Modulation Two-way Slip Power Correction Control Method for Thermal Power Generating Sets
  • Primary Frequency Modulation Two-way Slip Power Correction Control Method for Thermal Power Generating Sets

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Embodiment 1

[0031] Embodiment 1: as attached figure 1 , 2 As shown, the primary frequency modulation two-way slip power correction control method of the thermal power generating set includes an open-loop control system, the open-loop control system includes a judgment module and a selection output module, and the primary frequency modulation method of the open-loop control system includes the following steps:

[0032] The first step is to set the frequency difference function f1(x) according to the effective slip power input, divide the slip into forward slip and reverse slip according to the actual power, and set the forward slip correction function under the forward slip f2(x), set reverse slip correction function f3(x) under reverse slip;

[0033] In the second step, the frequency difference function f1(x) is multiplied with the forward slip correction function f2(x) and the reverse slip correction function f3(x) respectively,

[0034] Specifically include the following steps:

[00...

Embodiment 2

[0054] Embodiment 2: as attached figure 1 , 2 , as shown in Table 1 and Table 2, when the primary frequency regulation control strategy is running in a 350MW power plant unit, the primary frequency regulation function is put into operation. When the frequency of the power grid exceeds the range of (50±0.033) Hz, the corresponding steam turbine speed of the power plant exceeds (3000±0.033) Hz. 2) When within the dead zone of r / min, the primary frequency regulation function of the steam turbine of the power plant starts, and the steam turbine regulation door of the power plant starts to start. The frequency difference function and the two slip power correction functions of the primary frequency regulation of the power station need to be completed during the primary frequency regulation performance test of the unit .

[0055] Table 1 shows the setting parameters of f1(x) that satisfy the primary frequency modulation response when the effective slip is ±4, ±6, and ±13.5 under the...

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Abstract

The present invention relates to the technical field of primary frequency modulation of thermal power generating sets, and relates to a method for correcting bidirectional slip power correction of primary frequency modulation of thermal power generating sets. Forward slip correction function f2(x), set the reverse slip correction function f3(x); in the second step, the frequency difference function f1(x) is respectively combined with the forward slip correction function f2(x) and reverse slip The correction function f3(x) is multiplied, and the multiplied result is output to the integrated valve position of the main regulating valve through the selection output module to control the action of the steam turbine valve under forward slip and reverse slip. The primary frequency modulation open-loop control system of the present invention realizes the precise response of the next frequency modulation amount for each effective frequency difference in the full load section of the unit, and the primary frequency modulation closed-loop control system uses the calculation result as a feed-forward signal of the primary frequency modulation to control the valve action of the steam turbine, ensuring a Quickness of FM response.

Description

technical field [0001] The invention relates to the technical field of primary frequency modulation of a thermal power generating set, and relates to a bidirectional slip power correction control method for primary frequency modulation of a thermal generating set. Background technique [0002] Grid frequency is an important indicator of power quality and stable operation of the grid. It reflects the balance of supply and demand energy in the power system. When the power supply and power consumption in the system are out of balance, the grid frequency will deviate, which will cause great harm to demand-side users and generator sets. The hazards range from increasing energy consumption to causing defective product quality, damage to electrical equipment, and even grid failure. Therefore, maintaining frequency stability is one of the main tasks of grid operation. When the grid power load is unbalanced and the frequency deviates, the power system needs to adjust the frequency, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
Inventor 陈志强孔德安李伟赵翔刘江山刘世军王晓宇李建龙韩宏志徐强庄能康永昊李孟
Owner ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER
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