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CVT secondary side harmonic monitoring abnormal data correction method

A harmonic monitoring and abnormal data technology, applied in the field of distribution network, can solve the problems of excessive harmonic voltage, large error of low-order harmonic voltage test, inability to accurately reflect the real harmonic level of the power grid, etc., and achieve good effect and practicality The effect of strong performance and simple correction method

Pending Publication Date: 2020-08-21
LONGYAN POWER SUPPLY COMPANY STATE GRID FUJIAN ELECTRIC POWER +1
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Problems solved by technology

However, due to the inherent resonance characteristics of the CVT itself, there is a series-parallel resonance frequency for the low-order harmonic voltage, resulting in large errors in the low-order harmonic voltage test, which cannot accurately reflect the real harmonic level of the power grid, and the measurement results cannot be used as The basis for judging the harmonic voltage exceeding the standard needs to obtain relatively accurate harmonic voltage values ​​from other angles

Method used

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  • CVT secondary side harmonic monitoring abnormal data correction method
  • CVT secondary side harmonic monitoring abnormal data correction method
  • CVT secondary side harmonic monitoring abnormal data correction method

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Embodiment Construction

[0031] The present invention will be further described below through specific embodiments.

[0032] The invention proposes a CVT secondary side harmonic monitoring abnormal data correction method based on the accuracy of CVT measurement of fundamental wave voltage and current transformer measurement of low-frequency harmonics. The method of the present invention measures the harmonic current value and fundamental wave reactive power of the line according to the no-load line or when the line is in the no-load state for a certain period of time, and calculates the equivalent impedance of the line by using the charging power of the line, which can be estimated according to Ohm's law The operating level of the harmonic voltage of the bus is compared with the measurement results of the CVT.

[0033] The invention can not only judge the accuracy of the CVT harmonic measurement result, but also estimate the size of the measurement error. When the 220kV bus is directly connected to t...

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Abstract

The invention provides a CVT secondary side harmonic monitoring abnormal data correction method, which comprises: measuring quintuple harmonic current value and fundamental reactive power of a line according to a no-load line or a no-load state existing in a line in a certain period of time; calculating the equivalent impedance of the line by using the fundamental reactive power; calculating the quintuple harmonic voltage content of the bus according to the measured quintuple harmonic current value; comparing the quintuple harmonic voltage content with the quintuple harmonic voltage content measured by CVT; and correcting the quintuple harmonic voltage according to the comparison result. According to the invention, other measuring devices are not additionally arranged, the structure is simple, the economic cost is low, and large-scale popularization is facilitated.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to a method for correcting abnormal data of CVT secondary side harmonic monitoring. Background technique [0002] In an ideal clean power system, both current and voltage are sine waves. In a simple circuit containing only linear components (resistors, inductors, and capacitors), the current is proportional to the applied voltage, and the relationship between the two is linear. The current flowing in the circuit is also a sine wave, and there are no harmonics in the circuit. However, in the actual power supply system, most of the loads are non-linear loads (such as rectifiers, UPS power supplies, electronic speed control equipment, fluorescent lamp systems, computers, etc.), the current they absorb from the grid and the applied voltage It does not show a linear relationship, forming a non-sinusoidal current and generating harmonics. [0003] With the construction of the smart ...

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Application Information

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IPC IPC(8): H02J3/01G01R31/08
CPCH02J3/01G01R31/086G01R31/088Y02E40/40
Inventor 黄雁廖华年钟红红肖荣洋邹炜锋陈炜明张丽镪俞艳梅
Owner LONGYAN POWER SUPPLY COMPANY STATE GRID FUJIAN ELECTRIC POWER
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