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An Algorithm for Automatic Adjustment of Three-phase Current Unbalance in Low-Voltage Distribution Network

A low-voltage distribution network, three-phase current technology, applied in the direction of eliminating/reducing asymmetry in polyphase networks, reducing asymmetry in polyphase networks, etc., can solve problems such as current three-phase imbalance, reduce losses, improve distribution The effect of changing the power supply capacity and improving the quality of the power supply voltage

Active Publication Date: 2018-08-24
广州百德自动化技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem of unbalanced three-phase current on the low-voltage side of the distribution network, a balance scheme is proposed that takes the branch circuit as the adjustment object, takes 24 hours as the adjustment cycle, and aims at the balance of the station area, so as to achieve the three-phase balance of the station area

Method used

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  • An Algorithm for Automatic Adjustment of Three-phase Current Unbalance in Low-Voltage Distribution Network
  • An Algorithm for Automatic Adjustment of Three-phase Current Unbalance in Low-Voltage Distribution Network
  • An Algorithm for Automatic Adjustment of Three-phase Current Unbalance in Low-Voltage Distribution Network

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Embodiment 1

[0061] A three-phase current unbalance automatic adjustment algorithm for a low-voltage distribution network, comprising the following steps:

[0062] (1) Set the data window for the commutator, the size of the data window is 24 hours, calculate the average current in this 1 minute every 1 minute, and then fill in the data window.

[0063] (2) After the central controller is powered on and initialized, it starts to accumulate the average current per minute. When it reaches the first half hour, it calculates the average current for this half hour and records it. For the next half hour and the last half hour Hourly record comparison, if the average current of the current half hour is smaller than the average current of the previous half hour, then record the current moment and obtain and store the data half an hour before the current time of the commutator, if the commutator has not The successfully sent data are all sent to the central controller at this moment. If the average ...

Embodiment 2

[0071] A three-phase current unbalance automatic adjustment algorithm for a low-voltage distribution network, comprising the following steps:

[0072] (1) Set the data window for the commutator, the size of the data window is 30 hours, calculate the average current in this 1 minute every 1 minute, and then fill in the data window.

[0073] (2) After the central controller is powered on and initialized, it starts to accumulate the average current per minute. When it reaches the first half hour, it calculates the average current for this half hour and records it. For the next half hour and the last half hour Hourly record comparison, if the average current of the current half hour is smaller than the average current of the previous half hour, then record the current moment and obtain and store the data half an hour before the current time of the commutator, if the commutator has not The successfully sent data are all sent to the central controller at this moment. If the average ...

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Abstract

A three-phase current imbalance automatic regulation algorithm for a low-voltage power distribution network includes the following steps that 1, a data window is set for a phase changer; 2, whether data of the phase changer is extracted or not is judged according to whether the delay time of 24 hours is reached or not, and a balance algorithm is called; 3, after the balance algorithm is called, whether phase changing is needed or not is judged according to whether a pre-regulation effect is better than that indicated by a set value or not. The three-phase current imbalance automatic regulation algorithm solves the problem of three-phase imbalance of the low-voltage side current of the power distribution network, and a balance scheme with a branch circuit as the regulation object, a day as the regulation cycle and transformer district balance as the target is proposed, so that three-phase balance of a transformer district is achieved, the power supply capacity of a distribution transformer is effectively improved, the loss of a low-voltage line is reduced, and the quality of supply voltage for users is improved.

Description

technical field [0001] The invention relates to the field of power systems, in particular to an automatic adjustment algorithm for three-phase current unbalance used in a low-voltage distribution network. Background technique [0002] Three-phase unbalance: refers to the inconsistency of the three-phase current (or voltage) amplitude in the power system, and the amplitude difference exceeds the specified range. [0003] The hazards caused by the three-phase imbalance are as follows: [0004] 1. Increase the power loss of the line. In the three-phase four-wire power supply network, when the current passes through the line wire, the electric energy loss is bound to occur due to the existence of impedance, and the loss is proportional to the square of the passing current. When the low-voltage power grid is powered by a three-phase four-wire system, due to the existence of single-phase loads, it is inevitable to cause unbalanced three-phase loads. When the three-phase load is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 麦景松刘海峰李茂锋
Owner 广州百德自动化技术有限公司
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