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Generator set steady-state reactive power margin calculation system and method based on real-time data

A technology of real-time data and generating sets, applied in the direction of circuit devices, AC network circuits, single-network parallel feeding arrangements, etc., can solve problems such as inaccurate results, and achieve the effect of great reference value

Active Publication Date: 2020-12-15
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current AVC device has the calculation and display functions of the upper and lower limits of reactive power, the upper and lower limits are mainly reported by the power plant, and the results of the effects of each excitation limiter are not fully considered, and the results are not very accurate.

Method used

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  • Generator set steady-state reactive power margin calculation system and method based on real-time data
  • Generator set steady-state reactive power margin calculation system and method based on real-time data
  • Generator set steady-state reactive power margin calculation system and method based on real-time data

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Embodiment 1

[0071] Such as figure 2 As shown, Embodiment 1 of the present invention provides a real-time data-based steady-state reactive power margin calculation system for generator sets, which includes:

[0072] The data acquisition module is used to collect the active power, reactive power and machine terminal voltage of the generating set in real time, and store them for the next calculation.

[0073] A fixed value storage module (storage module), which is used to input and store the fixed values ​​of the generating set and the excitation system for subsequent calculation.

[0074] The lower limit calculation module of reactive power (the first calculation module), which is used for setting the low excitation limit of the excitation system, the parameters of the generator and the main transformer, the real-time data of the active power and reactive power of the machine terminal voltage of the unit, and the real-time reactive power of the computer group. lower limit.

[0075] Over-...

Embodiment 2

[0124] Such as Figure 4 As shown, a real-time data-based generator set steady-state reactive power margin calculation system provided by Embodiment 2 of the present invention includes:

[0125] The first calculation module is used to calculate the real-time lower limit of reactive power of the set according to the fixed value parameters of the excitation system, the parameters of the generator and the main transformer, and the real-time data of the set state;

[0126] The second calculation module is used to calculate the real-time reactive upper limit corresponding to the over-reactive limit of the set according to the fixed value parameters of the excitation system and the real-time data of the set state;

[0127] The third calculation module is used to calculate the real-time reactive upper limit corresponding to the rotor overcurrent limit according to the fixed value parameters of the excitation system, the parameters of the generator and the main transformer, and the re...

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Abstract

The invention provides a generator set steady-state reactive power margin calculation system and method based on real-time data, and belongs to the technical field of generator set reactive power voltage regulation. The method comprises steps: respectively calculating the real-time reactive lower limit of the unit, the real-time reactive upper limit corresponding to the over-reactive limit, the real-time reactive upper limit corresponding to the rotor over-current limit, the real-time reactive upper limit corresponding to the stator over-current limit and the real-time reactive upper limit corresponding to the volt-hertz limit; and comparing the real-time reactive power upper limits, outputting the minimum reactive power upper limit as the final reactive power upper limit, and obtaining areactive power margin curve by combining the real-time reactive power lower limit of the unit. According to the invention, the steady-state reactive upper and lower limits of the generator can be accurately calculated, so that the power dispatching control center can master the reactive real adjustment capability of the unit, a great reference value for reactive power distribution adjustment of dispatching automation is achieved, and a basis is provided for reactive support adjustment under emergency conditions.

Description

technical field [0001] The invention relates to the technical field of reactive power and voltage regulation of generating sets, in particular to a system and method for calculating a steady-state reactive power margin of generating sets based on real-time data. Background technique [0002] With the continuous operation of UHV DC projects, the reactive power and voltage regulation characteristics of power systems have also undergone profound changes. In the case of large disturbances, the DC converter station will absorb or emit a large amount of reactive power from the system for a short time, seriously affecting the grid voltage stability. Therefore, the reactive voltage regulation capability of conventional thermal power units is becoming more and more important. The unit steady-state reactive power margin calculated based on the real-time collection of data such as the terminal voltage, active power, and reactive power of the generator set has great reference value for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/50
CPCH02J3/50H02J2203/20
Inventor 解笑苏朱应峰张维超袁训奎孟祥荣麻常辉王亮张冰辛刚杨冬高嵩庞向坤汪挺马琳琳赵康马欢王进王茗
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY