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Three-phase power grid electrical parameter measurement method and intelligent circuit breaker control method

A technology of three-phase power grid and measurement method, which is applied in the direction of electric power measurement through current/voltage, measurement with digital measurement technology, and measurement device, which can solve the problems of long measurement period, slow calculation speed, and large calculation amount, and achieve Simplify the switching strategy, improve the switching accuracy, and solve the effect of diagnosis and alarm

Inactive Publication Date: 2016-06-22
XIAMEN UNIV OF TECH
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Problems solved by technology

However, its electrical parameter measurement method is complicated, the calculation amount is large, the calculation speed is slow, and the measurement period is long, which affects the switching accuracy and real-time performance of the circuit breaker to a certain extent, so that the monitoring and protection functions of the circuit breaker have not been optimized.

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  • Three-phase power grid electrical parameter measurement method and intelligent circuit breaker control method
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  • Three-phase power grid electrical parameter measurement method and intelligent circuit breaker control method

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Embodiment Construction

[0023] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 As shown, the three-phase power grid electrical parameter measurement method includes the following steps

[0025] A1, synchronously sampling the current and voltage of each phase of the three-phase grid.

[0026] Specifically, a high-precision hollow transformer is used to sample the current signal, and a voltage dividing circuit is used to sample the voltage signal. The Fourier transform is based on synchronous sampling, which requires the signal to be intercepted throughout the cycle and sampled at strict equal intervals. Therefore, it is necessary to ensure that the sampled signal and the actual signal are strictly synchronized, that is, the sampling frequency is an integer multiple of the signal frequency, otherwise there will be Spectrum leakage causes errors in Fourier transform results and affects measurement accurac...

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Abstract

The invention relates to the field of intelligent circuit breaker control, and discloses a three-phase power grid electrical parameter measurement method comprising the following steps that A1, current and voltage signals of all phases of a three-phase power grid are synchronously sampled; A2, the sampled current and voltage signals of all phases are conditioned and converted into digital signals through A / D conversion; and A3, the converted current and voltage of all phases are calculated by adopting fast Fourier transform so that effective values UK and IK of harmonic voltage and current of each order and active power PK of all phases are obtained. The invention also discloses an intelligent circuit breaker control method. Intelligent circuit breaker control is performed by adopting the method so that switching precision can be effectively enhanced, the switching strategy can be simplified, the problems of intelligent circuit breaker diagnosis alarm and high-speed real-time data communication can be solved, the overall performance of the circuit breaker can be greatly enhanced, and the "four remote" functions of remote metering, remote control, remote signaling and remote regulating of the onsite circuit breaker can be realized.

Description

technical field [0001] The invention belongs to the field of intelligent circuit breaker control, and in particular relates to a method for measuring electric parameters of a three-phase power grid and a control method for an intelligent circuit breaker. Background technique [0002] As the basic component of low-voltage power distribution, the circuit breaker is responsible for the distribution and transmission of electric energy and the protection and control of electrical equipment, etc., and plays a pivotal role in the reliable operation of the power system; , in addition to the traditional functions, the circuit breaker also needs to realize real-time power quality monitoring, operation status monitoring, dynamic configuration and hierarchical protection functions. Therefore, high-speed, two-way, real-time and integrated technical requirements are put forward for the communication function of intelligent circuit breakers. However, in the long-term actual operation of th...

Claims

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Application Information

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IPC IPC(8): G01R19/25G01R19/02G01R21/06H04L12/40H04L29/08
CPCG01R19/25G01R19/02G01R21/002G01R21/06H04L12/40H04L67/025
Inventor 刘美俊
Owner XIAMEN UNIV OF TECH
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