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A microcomputer protection method and device adapted to the frequency conversion characteristics of electrical equipment

A technology for electrical equipment and microcomputer protection, applied to emergency protection circuit devices, emergency protection data processing devices, circuit devices, etc., can solve problems such as large calculation errors, calculation errors, and inaccurate correspondence of data windows, and achieve the goal of solving calculation errors Effect

Active Publication Date: 2021-09-03
NANJING GUODIAN NANZI WEIMEIDE AUTOMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the deviation of the frequency of the electrical quantity, the changed data window cannot accurately correspond to the actual period of the electrical quantity. That is, within one cycle, the number of points in the data window is not necessarily an integer. For example, if the current frequency of the electrical quantity is 47Hz, the number of points is 1200 / 47=25.53 pieces, thus causing calculation errors, the greater the frequency deviation of the electrical quantity, the greater the calculation error

Method used

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  • A microcomputer protection method and device adapted to the frequency conversion characteristics of electrical equipment
  • A microcomputer protection method and device adapted to the frequency conversion characteristics of electrical equipment
  • A microcomputer protection method and device adapted to the frequency conversion characteristics of electrical equipment

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Embodiment 1

[0060] This embodiment is a microcomputer protection method adapted to the frequency conversion characteristics of electrical equipment, refer to figure 1 Shown include:

[0061] Obtain equipment operation sampling data;

[0062] Calculate the current actual frequency of the device based on the sampling data;

[0063] According to the rated frequency of the equipment and the actual frequency of the equipment, the sampling data is corrected to obtain the power frequency correction data;

[0064] According to the preset protection calculation and sampling data selection rules, multiple protection calculations are performed based on power frequency correction data or original sampling data, and according to the results of protection calculations, the protection action actuator is controlled to perform protection actions.

[0065] The running sampling data of the equipment is based on the data obtained by sampling at a fixed sampling frequency. The fixed sampling frequency can b...

Embodiment 2

[0095] This embodiment is a microcomputer protection device adapted to the frequency conversion characteristics of electrical equipment, including:

[0096] The equipment operation data acquisition module is used to obtain equipment operation data based on preset fixed frequency sampling;

[0097] The actual frequency calculation module of the equipment is used to calculate the current actual frequency of the equipment according to the sampling data;

[0098] The sampling data correction module is used to correct the sampling data according to the fixed frequency and the actual frequency of the equipment to obtain the power frequency correction data;

[0099] And the protection calculation and control output module, which is used to perform multiple protection calculations based on the power frequency correction data or original sampling data according to the preset protection calculation and sampling data selection rules, and control the execution of the protection action act...

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Abstract

The invention discloses a microcomputer protection method and device adapting to the frequency conversion characteristics of electrical equipment. The method includes: obtaining equipment operation sampling data; calculating the current actual frequency of the equipment according to the sampling data; and correcting the sampling data according to the fixed frequency and the actual frequency of the equipment to obtain Power frequency correction data; according to the preset protection calculation and sampling data selection rules, multiple protection calculations are performed based on power frequency correction data or original sampling data, and according to the results of protection calculations, the protection action actuator is controlled to perform protection actions. The invention can reduce the calculation error caused by the frequency offset, so that the microcomputer protection can obtain reliable data on the electrical quantity change of the unit during the frequency conversion start-up process of the equipment, thereby ensuring the reliability of protection calculation and logic judgment.

Description

technical field [0001] The invention relates to the technical field of microcomputer protection for electrical equipment such as a gas turbine unit and a pumped storage unit, in particular to a microcomputer protection method and device adapted to the frequency conversion characteristics of electrical equipment. Background technique [0002] During the start-up process of gas turbine units and pumped storage units, the frequency of current and voltage changes, while the traditional generator protection algorithm is designed based on power frequency. When the frequency of electrical quantities deviates from power frequency, large calculation errors will occur. When the offset is larger, the calculation error is larger. [0003] At present, the generator protection algorithms that adapt to the frequency change of electrical quantity mainly include: [0004] (1) Frequency tracking algorithm [0005] The protection device adjusts the hardware sampling frequency according to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H1/00H02H7/06
CPCH02H1/0092H02H7/06
Inventor 刘小波丁俊健刘万斌
Owner NANJING GUODIAN NANZI WEIMEIDE AUTOMATION CO LTD