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Distribution transformer load estimation method and system for power distribution network load flow calculation

A technology for power flow calculation and distribution network, applied in the field of distribution network, can solve problems affecting the accuracy of power flow calculation, and achieve the effect of improving efficiency and compatibility, ensuring reliability and accuracy, and facilitating data acquisition.

Pending Publication Date: 2021-10-08
YUNNAN POWER GRID CO LTD KUNMING POWER SUPPLY BUREAU
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for most distribution networks, distribution transformers are not equipped with TTUs, or limited by the transmission quality and rate of communication channels, the metering devices of distribution transformers can only upload the collected load data to the metering center at regular intervals every day, and the control center cannot Obtain real-time load data of distribution transformer in time
In the case that it is difficult to obtain the load data of the 10kV distribution network, only an approximate method can be used to process the load, which affects the accuracy of the power flow calculation

Method used

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  • Distribution transformer load estimation method and system for power distribution network load flow calculation
  • Distribution transformer load estimation method and system for power distribution network load flow calculation
  • Distribution transformer load estimation method and system for power distribution network load flow calculation

Examples

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Embodiment 1

[0053] This example discloses a mutation load estimation method for the power flow calculation of the distribution network, and the main factors of concern include:

[0054] (1) Load estimation of the current time

[0055] When the trend is calculated, the load estimation of the change is different from the traditional load prediction, its estimation goal is the current time load value, and the total load line is known, and the weather parameters of the day are also known. For the present embodiment, the load estimate of the current feeder total load and meteorological conditions is used to provide conditions.

[0056] (2) Correlation between the total load of the transformation load and the feeder

[0057] During the operation of the distribution network, the total load of the feeder is equal to all the change loads (ignore the line damage) in this feeder. For each transformation, the feeder total load contains some of the operation information of this changeload. And the total l...

Embodiment 2

[0119] In accordance with the above embodiment, the present embodiment discloses a distribution load estimation system calculated by a distribution network, including a memory, a processor, and a computer program stored on the memory and can run on the processor. The step of implementing the following method when performing the computer program:

[0120] In real time, the active power load of the feeder is monitored. When calculating the trend of a feeder, the active power history data of the feeder and the powerful power history data of each of the feed lines are obtained, and the historical meteorological data of the same period of the feeder is obtained;

[0121] Extraction 2 hours before the current time of the current time The active power sequence corresponding to the previously 2 hours before the current time of each change in the power, the power-based load is determined based on the DTW distance; and create the current The day meteorological feature vector, based on the w...

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Abstract

The invention relates to the technical field of power distribution networks, discloses a distribution transformer load estimation method and system for power distribution network load flow calculation, and aims to improve the accuracy of 10kV power distribution network load flow calculation. The method comprises the following steps: acquiring active power historical data of a feeder line and active power historical data of each distribution transformer on the feeder line, and acquiring historical meteorological data of the feeder line in the same period; extracting a feeder load active power sequence 2 hours before the current moment on the current day and a load active power sequence of each distribution transformer corresponding time period on the feeder, and determining a feeder similar day based on a DTW distance; determining meteorological similar days from the meteorological feature vector sets of other historical days based on a weighted grey correlation analysis method; judging whether the feeder line similar day and the weather similar day are the same day or not, and if so, taking the active and reactive loads of the day as the active and reactive loads of the current distribution transformer; otherwise, fusing the load data corresponding to the feeder line similar day and the weather similar day to calculate the active load and the reactive load of the current distribution transformer.

Description

Technical field [0001] The present invention relates to the technical field of distribution network, and more particularly to a mutation load estimation method and system for distribution network. Background technique [0002] In the field of distribution network automation, many occasions require real-time calculation of trend. The load power is the basic data of the trend calculation. 10kV distribution network trend calculations need to get the node load power on the feed line, that is, the power and reactive power of the distribution transformer (hereinafter referred to as the change). At present, the automation level of distribution network in various regions is uneven. For distribution networks with high degree of automation, the mount installation has a changed terminal (TTU, DISTRIBUTION TRANSFORMER Supervisoryterminal Unit), SCADA (Supervisory Control and Data Acquisition,) data acquisition and monitoring control) system can have a change in the change, reactiveness Power...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/06G06F17/11H02J13/00
CPCH02J3/003H02J3/06G06F17/11H02J13/00002H02J13/00006H02J2203/10H02J2203/20Y02E60/00Y04S40/12Y04S10/50
Inventor 周胜超胡泽江杨晨曦何静宗德文陈蒙马杰杨凡奇张小丽王勇
Owner YUNNAN POWER GRID CO LTD KUNMING POWER SUPPLY BUREAU
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