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Low-voltage transformer area topology identification method based on PWM characteristic modulation current

A technology for modulating current and identifying methods, applied in the direction of measuring electricity, electrical components, circuit devices, etc., can solve the problem of poor topology identification accuracy, and achieve the effect of improving accuracy, easy identification and capture, and high accuracy

Pending Publication Date: 2021-10-01
SPL ELECTRONICS TECH CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to provide a low-voltage station area topology identification method based on PWM characteristic modulation current, which is used to solve the problem of poor accuracy of topology identification due to inaccurate capture of feature codes in existing methods

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  • Low-voltage transformer area topology identification method based on PWM characteristic modulation current
  • Low-voltage transformer area topology identification method based on PWM characteristic modulation current
  • Low-voltage transformer area topology identification method based on PWM characteristic modulation current

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Embodiment Construction

[0032] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0033] This embodiment proposes a low-voltage station area topology identification method based on PWM characteristic modulation current. The core idea of ​​the method is: the master station of the low-voltage station area sends identification commands according to the established process; After receiving the recognition command, each identified device, such as each meter end of a modular terminal, sends a feature identification code according to the established identification process, and passes the feature identification code through GFSK (Gaussian frequency shift keying modulation) to generate a GFSK signal , and then processed through PWM (Pulse Width Modulation), and output a characteristic modulation current with better transmission characteristics and identification characteristics to the grid line in the station area; then, through ot...

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Abstract

The invention relates to a low-voltage transformer area topology identification method based on PWM characteristic modulation current. The method comprises the steps that a transformer area master station sends an identification command to each device in a transformer area, generates a characteristic identification code at each device, carries out the Gaussian frequency shift keying modulation of the characteristic identification code, generates a GFSK signal, carries out the pulse width modulation processing, and outputs the characteristic modulation current to the line; the line current signal is received and demodulated through related devices in the transformer area so as to restore the characteristic identification code, and the size, phase and time mark of the identified line current signal are recorded and reported to the master station; and the master station is used for drawing the physical topology of the line according to the identification information. According to the method, the processing mode of combining Gaussian frequency shift keying modulation and pulse width modulation is utilized, the characteristic modulation current with good spectrum identification characteristics and good transmission characteristics can be generated, the device can identify and capture the characteristic modulation current more easily, the accuracy of signal acquisition is high, and therefore the accuracy of topology identification is improved.

Description

technical field [0001] The invention belongs to the technical field of power line carrier communication, and in particular relates to a topology identification method of a low-voltage station area based on PWM characteristic modulation current. Background technique [0002] The principle of the existing topology identification method for low-voltage stations is to load the characteristic identification code into the modulation current with certain frequency domain characteristics. When the characteristic code is 1, the characteristic current is sent, and when the characteristic code is 0, the characteristic current is not sent. For example, the application The invention patent application with the publication number CN110988476A proposes "A Phase Topology Identification Device and Identification Method for Station Areas". This method will generate a fixed frequency offset when the characteristic modulation current is generated. During the transmission of the characteristic co...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J13/00G01R31/00
CPCH02J3/00H02J13/00001H02J13/00002H02J13/00007H02J13/00009G01R31/00H02J2203/10Y02E60/00Y02B90/20Y04S40/121
Inventor 庞浩郭宇飞胡博
Owner SPL ELECTRONICS TECH CO LTD
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