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Method for measuring synchronous phasor

A technology of synchronized phasor measurement and clock synchronization, which is applied in the field of power system, can solve the problems of inability to effectively respond to the dynamic change process of the power system and low measurement accuracy, and achieve the effects of reduced spectrum leakage, high measurement accuracy, and high measurement progress

Active Publication Date: 2014-01-29
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0003] During the operation of the power grid, amplitude modulation, phase angle modulation, and amplitude and phase angle modulation occur occasionally under dynamic conditions such as low-frequency oscillation, subsynchronous oscillation, and out-of-step of the power system. The existing ones are suitable for power system The measurement algorithm of the synchronized phasor measurement device under static conditions is the average process of phasor measurement under dynamic conditions, and its measurement accuracy is not high, and it cannot effectively reflect the dynamic process of the power system

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  • Method for measuring synchronous phasor
  • Method for measuring synchronous phasor
  • Method for measuring synchronous phasor

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[0039] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] Such as figure 1 as shown, figure 1 It is a diagram of the synchrophasor measurement system; the synchrophasor measurement system includes voltage transformers, current transformers, secondary voltage transmitters and current transmitters, FPGA modules, AD sampling modules, and embedded processors.

[0041] The voltage transformer and the current transformer obtain the voltage signal and the current signal respectively; the voltage signal and the current signal are sent to the secondary voltage transmitter and the secondary current transmitter, and the secondary voltage transmitter and the secondary current transmitter are transmitted Convert the voltage signal and current signal into measurement signals respectively; the FPGA module performs low-pass filtering on the measurement signals, and analyzes the clock synchronizat...

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Abstract

The invention provides a method for measuring a synchronous phasor. The method comprises the steps that a voltage transformer and a current transformer acquire a voltage signal and a current signal respectively; a secondary voltage transducer and a current transducer convert the voltage signal and the current signal into measured signals respectively; an FPGA module controls an AD sampling module to conduct AD synchronous sampling according to a clock synchronous signal and a synchronous pulse per second; an embedded processor receives AD sampling data of an FPGA. Regarding the shortcoming of a measuring method of the synchronous phasor of a conventional power system, with the combination of the characteristic of inputting the signals under the dynamic condition of the power system, the method can effectively improve the measurement precision of the synchronous phasor under the dynamic condition.

Description

technical field [0001] The invention relates to a measurement method in the field of power systems, in particular to a synchronized phasor measurement method. Background technique [0002] The traditional synchronized phasor algorithm based on the static condition of the power system and the deviation of the system frequency under the static condition is to correct the error of the phasor calculated by the conventional discrete Fourier transform to improve the accuracy of the phasor measurement. [0003] During the operation of the power grid, amplitude modulation, phase angle modulation, and amplitude and phase angle modulation occur occasionally under dynamic conditions such as low-frequency oscillation, subsynchronous oscillation, and out-of-step of the power system. The existing ones are suitable for power system The measurement algorithm of the synchronized phasor measurement device under static conditions is the average process of phasor measurement under dynamic condi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/00
Inventor 汤飞许勇冯志畅程春和王伟涛李倩郑国太董志猛
Owner STATE GRID CORP OF CHINA
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