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Harmonic voltage responsibility calculation alarm method for single-point monitoring of power distribution network

A technology of harmonic voltage and distribution network, applied in the field of harmonic voltage responsibility calculation and alarm, which can solve the problem of inability to obtain phase angle information.

Active Publication Date: 2015-12-09
GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU
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  • Application Information

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Problems solved by technology

No matter which regression algorithm is used, it is based on the harmonic data of the monitoring point. In actual engineering, the amplitude of the harmonic voltage and current can generally be measured, but the phase angle information cannot be obtained. How to use only the amplitude to determine Harmonic liability is a more concerned issue in engineering

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  • Harmonic voltage responsibility calculation alarm method for single-point monitoring of power distribution network
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  • Harmonic voltage responsibility calculation alarm method for single-point monitoring of power distribution network

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Embodiment Construction

[0051] Combine below figure 1 , to further illustrate the technical solution of the present invention with an example.

[0052] Step 1): Obtain the basic electric energy parameters of the monitoring points, including the nominal bus voltage U N , the capacity of the feeder customer’s installation agreement S i And the total capacity S of the busbar.

[0053] u N =10kV

[0054] S=50MVA

[0055] S i =18600kVA;

[0056] Step 2): Collect the harmonic data of the monitoring point, collect the harmonic voltage and harmonic current data of the power quality monitoring point, the monitoring point location is as follows figure 2 .

[0057] The following table shows the 5th harmonic voltage and harmonic current data collected in a certain period of time.

[0058] data serial number

Harmonic voltage

Harmonic current

1

41.0996

5.0636

2

41.1873

5.4449

3

40.817

5.2229

4

40.541

5.1666

5

41.9485 ...

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Abstract

The invention discloses a harmonic voltage responsibility calculation alarm method for single-point monitoring of a power distribution network. The harmonic voltage responsibility calculation alarm method comprises the following steps of 1) acquiring a basic electric energy parameter of a monitoring point; 2) acquiring harmonic data of a monitoring point; 3) screening data; 4) calculating a harmonic voltage responsibility; and 5) determining a threshold voltage and alarming. According to the harmonic voltage responsibility calculation alarm method, the load-side harmonic voltage responsibility is determined through analyzing the harmonic data of the monitoring point, and furthermore an alarm threshold is generated. Quantification for the harmonic pollution of a feed line is facilitated, and a system-side harmonic pollution responsibility is differentiated from a user-side harmonic pollution responsibility, thereby facilitating targeted treatment by professional personnel and ensuring safe and stable operation of the power grid.

Description

technical field [0001] The invention relates to a harmonic voltage responsibility calculation and alarm method for single-point monitoring of distribution network. Background technique [0002] With the rapid development of modern power electronics technology, a large number of nonlinear loads, such as rectifiers, electric arc furnaces, and frequency conversion devices, have been widely used in power systems, and harmonic pollution has become increasingly serious. In order to effectively control the harmonic problem and improve the power quality, it is necessary to analyze and determine the harmonic distribution in the power system, find the source of harmonic pollution, and reasonably distinguish the responsibility for harmonic pollution caused by each harmonic source. [0003] At present, the research on harmonic source identification and responsibility division based on single-point monitoring comes down to how to calculate the harmonic impedance and background harmonics ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G01R19/00
Inventor 谢伟伦李春华薛峰李海涛谢培成黄志威李世亨谢建容王传旭林伯琴胡秋兰陈蔚茹
Owner GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU
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