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Active power distribution network fault determination method and system

A distribution network fault and determination method technology, which is applied to the fault location, fault detection according to the conductor type, and electrical measurement, can solve the problems of increasing calculation workload and reducing fault detection sensitivity

Pending Publication Date: 2021-01-29
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2. Increase the overcurrent detection setting value according to the maximum short-circuit current that all distributed power sources on the feeder can provide. Based on the calculation of short-circuit current, limit the maximum access capacity of distributed power sources. By adjusting the switch over-current setting value, the system power supply The minimum short-circuit current provided by the distributed power supply and the maximum short-circuit current provided by the distributed power supply are separated, and then the traditional fault section location scheme is used for fault location. This method will greatly increase the computational workload and reduce the fault detection sensitivity

Method used

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  • Active power distribution network fault determination method and system
  • Active power distribution network fault determination method and system
  • Active power distribution network fault determination method and system

Examples

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Effect test

Embodiment 1

[0101] A schematic flowchart of a method for determining faults in an active distribution network provided by the present invention is as follows: figure 1 shown, including:

[0102]Step 1: Collect the phase voltages of each measurement point in the active distribution network, and decompose the measured phase voltages into fundamental waves and voltage harmonics of multiple orders respectively;

[0103] Step 2: Input multiple voltage harmonics of multiple measurement points into the pre-trained operating state classifier to determine whether the active distribution network is faulty;

[0104] Step 3 If a fault occurs, input the phase-to-phase voltage difference and zero-sequence voltage of multiple measurement points into the pre-trained fault classifier to obtain the fault type, and input multiple voltage harmonics of multiple measurement points into the pre-trained location classification. to get the suspected location of the fault; otherwise, end.

[0105] The object of ...

Embodiment 2

[0112] Specific examples of the present invention will be described in detail below with reference to the accompanying drawings. The present invention includes the following key steps:

[0113] Step 11: Carry out PSCAD modeling for the active distribution network to be studied, and collect the original data. The collected data includes the phase voltages at each measurement point. The established PSCAD model such as Figure 9 As shown, the IEEE 33-node active distribution network PSCAD model has 32 nodes and two distributed power sources, with a total of 34 measurement points.

[0114] Step 12: Data processing for judging the running state.

[0115] Extract the phase voltages of each measurement point in one cycle after multiple groups of faults and under normal operating conditions, and obtain the fundamental wave and 2-7th harmonics of the phase voltage of each measurement point through Fourier analysis of the data in each state. components, forming the original feature ...

Embodiment 3

[0196] A specific calculation example is given below.

[0197] Based on PSCAD / EMTDC software, such as Figure 9 IEEE 33 node active distribution network model shown. Measurement points are set at the head end of each line and the DG access point. The measurement point serial number is set to be the same as the serial number of the end node of the line. The measurement point serial numbers at the DG1 and DG2 access points are 33 and 34 respectively, so there are 34 measurement points in total. Point, measure the three-phase voltage, and the two DGs are grid-connected inverter-type direct-drive wind turbines.

[0198] Step 21: Data Acquisition and Preprocessing

[0199] Five fault types, namely AB, AC, AB-G, AC-G, ABC, are simulated at 50% of the 32-segment lines of the PSCAD model of the active distribution network, and the three-phase voltage of each measurement point in one cycle after the fault is extracted. , through Fourier analysis, the A-phase fundamental frequency an...

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Abstract

The invention provides an active power distribution network fault determination method and system, and the method comprises the steps: collecting the phase voltage of each measurement point in an active power distribution network, and respectively decomposing each measured phase voltage into a fundamental wave and a plurality of voltage harmonics; inputting the plurality of voltage harmonics of the plurality of measurement points into a pre-trained running state classifier, and judging whether the active power distribution network has a fault or not; if a fault occurs, inputting the inter-phase voltage difference and the zero-sequence voltage of the plurality of measurement points into the pre-trained fault classifier to obtain a fault type, and inputting the plurality of voltage harmonicsof the plurality of measurement points into a pre-trained position classifier to obtain a suspected position of the fault; otherwise, ending. According to the active power distribution network faultdetermination method and system provided by the invention, the fault of the active power distribution network can be effectively determined, a voltage transformer or a sensor does not need to be additionally arranged, the calculation workload is not increased, and the relatively high fault detection sensitivity can also be realized.

Description

technical field [0001] The invention belongs to the technical field of active distribution network operation control, and in particular relates to a method and system for determining faults in an active distribution network. Background technique [0002] Active distribution network refers to a distribution network with a large number of access to distributed power sources and bidirectional power flow, also known as active distribution network. Compared with the traditional distribution network, the active distribution network has the characteristics of complex structure and many branches. Moreover, due to the addition of distributed power sources, the magnitude and direction of the characteristic quantities such as voltage and current are uncertain, making the traditional distribution network fault determination method no longer applicable. in the active distribution network. [0003] In the prior art, there are few research achievements on the influence of distributed powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52G01R31/58
CPCG01R31/085G01R31/086G01R31/088G01R31/52G01R31/58
Inventor 刘科研孟晓丽盛万兴董伟杰詹惠瑜肖仕武赵伟魏佳
Owner CHINA ELECTRIC POWER RES INST
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