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Harmonic correction method and device for power system

A technology of power system and relay protection device, which is applied in the field of power system and can solve problems such as misjudgment

Active Publication Date: 2018-12-21
SIEMENS POWER AUTOMATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the user will analyze and adjust the working conditions and faults of the entire power system according to the high-order filter value displayed by the fault recording device, resulting in misjudgment

Method used

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  • Harmonic correction method and device for power system

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Embodiment Construction

[0008] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0009] Such as figure 1 As shown, the sampling device first samples the operating voltage and current of the electric equipment / line 100 , and transmits the obtained operating voltage and current value to the relay protection device 200 . Wherein, the relay protection device 200 includes a low-pass filter 201 , a protection circuit 202 and a fault recording device 203 . The high-order harmonics of the operating current and voltage of the power system are attenuated after passing through the low-pass filter 201, and the protection circuit 202 and the fault recording device 203 in the relay protection device 200 will respectively reduce the attenuated high-order harmonics The wave value is corrected, so that the corrected higher harmonic value is displayed on the client 300 through the fault wave recording software, so that the user can correctly jud...

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Abstract

The invention provides an electric power system harmonic correction method and device. The electric power system harmonic correction method comprises the following steps that current and voltage signals of an electric power system under the working state area acquired; and the sampled voltage and current signals are transmitted to a relay protection device and firstly pass through a low-pass filter in the relay protection device, and the relay protection device also comprises a protection loop and a fault recording device, wherein the protection loop corrects the high-order harmonic value of the voltage and current signals, and the fault recording device calls the correction parameters related to the high-order harmonic value in the protection loop to correct the high-order harmonic value. The influence of the low-pass filter on high-order harmonic sampling is eliminated so that fault recording software is enabled to display the actual harmonic value. Besides, accurate harmonic information can be conveniently and directly obtained in fault analysis of the electric power system so that the reliability of fault recording for harmonic information analysis can be enhanced.

Description

technical field [0001] The invention relates to a power system, in particular to a method and device for correcting harmonics in a power system. Background technique [0002] In the existing relay protection device of the power system, the fault recording device does not take into account the influence of the low-pass filter of the hardware analog circuit on the harmonic component. Specifically, the high-order harmonics of the working power voltage value of the power system passing through the low-pass filter will be weakened, so the value attenuated by the low-pass filter will be displayed in the fault recording device instead of the normal high Secondary filter value. Therefore, the user will analyze and adjust the working conditions and faults of the entire power system according to the high-order filter value displayed by the fault recording device, resulting in misjudgment Contents of the invention [0003] The first aspect of the present invention provides a harmon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R23/04
Inventor 佀斐朱来强曹祯
Owner SIEMENS POWER AUTOMATION