Voltage and current split type electric energy quality measuring device and method for intelligent substation

Abstract

The invention discloses a voltage and current split type electric energy quality measuring device and method for an intelligent substation. Voltage and current electric energy quality indexes can be simultaneously measured, measurement signals are respectively taken from analog voltage and current signals at the front end of a merging unit, electric energy quality indexes such as harmonic waves and the like are accurately obtained, and the problems that a digital electric energy quality measurement device cannot measure higher harmonic waves and measurement indexes in a traditional analog signal measurement method are incomplete are solved. A voltage measurement module and a current measurement module are independently arranged. The voltage measurement module and the current measurement module are respectively provided with a plurality of voltage signal measurement channels and current signal measurement channels. The voltage measurement module and the current measurement module are electrically connected with a high-precision clock wireless synchronization module, the voltage signal measurement channels and the current signal measurement channels are electrically connected with avoltage measurement screen and a current measurement screen respectively, and the voltage measurement screen and the current measurement screen are electrically connected with a merging unit.

Description

technical field [0001] The invention relates to a voltage and current split type electric energy quality measuring device and method for an intelligent substation, belonging to the technical field of electric energy quality measurement, and in particular to an accurate electric energy quality measurement method for an intelligent electric substation. Background technique [0002] Smart substations are becoming more and more popular, undertaking the transformation and transmission tasks of electric energy. As the power load tends to be more and more electronic, power quality problems such as harmonics are becoming more and more prominent. However, the sampling frequency of voltage, current and signal of most smart substations is 4kHz at present, which is insufficient to meet the requirements of accurate measurement of power quality indicators such as harmonics, especially high-order harmonics. At present, there are mainly the following methods for testing the power quality o...

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Problems solved by technology

[0006] The present invention overcomes the deficiencies in the prior art, and provides a voltage and current split-type power quality measurement device and method for intelligent substations, which can simultaneously measure voltage and current power quality indicators, and the measurement signals are respectively taken from the combined The front-end analog voltage and current signals of the unit can accurately obtain power quality indicators such as harmonics, which solves the problem that digital power quality measurement devices cannot measure high-order harmonics and the measurement indicators are not comprehensive in traditional analog signal measurement methods

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