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A low-voltage load online phase modulation control method

A low-voltage load and control method technology, applied in the direction of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, etc., can solve the problem of low user voltage, reduced output of distribution transformers, distribution transformers and low-voltage lines Increase in loss and other problems, to achieve the effect of extending the service life and reducing the number of switching operations

Active Publication Date: 2015-08-05
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unequal currents of the three phases lead to unbalanced currents on the neutral line, resulting in increased losses of distribution transformers and low-voltage lines, reduced actual output of distribution transformers, and easily causing low voltage for users on heavy-duty phases, which cannot meet the needs of rural residents. Normal production and domestic electricity demand

Method used

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  • A low-voltage load online phase modulation control method
  • A low-voltage load online phase modulation control method
  • A low-voltage load online phase modulation control method

Examples

Experimental program
Comparison scheme
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Embodiment

[0092] For a specific low-voltage user load on a load outgoing line, the specific switching process for switching it from phase A to phase B according to the first control command is as follows:

[0093] 1> After the processor receives the conversion control command to switch the low-voltage user load on the i-th load outlet line from phase A to phase B, it switches the i-th single-phase controllable switch of the load selection switch and the phase A of the transition circuit I The controllable switch and the B-phase controllable switch of the transition circuit II are closed at the same time; where i=1, 2,...n;

[0094] 2> After the i-th single-phase controllable switch of the load selection switch, the A-phase controllable switch of the transition circuit I and the B-phase controllable switch of the transition circuit II are completely closed, trigger the conduction of the anti-parallel thyristor of the transition circuit I signal, triggering the positive half-period conduc...

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Abstract

The invention relates to a method for controlling low-voltage load on-line phasing. According to the method, firstly, the unbalancing situation of a three-phase current of an outgoing line on the low voltage side of a distribution transformer is monitored through a comprehensive distribution transformer terminal, and if the unbalancing situation is in the monitoring period range, and the overtime or exceeded times of the unbalancing situation of the three-phase current reach a certain proportion, on-line phasing execution is determined; secondly, the three-phase current of the outgoing line on the low voltage side of the distribution transformer and the current real-time data and the phase sequence real-time data of load branches connected with intelligent low voltage on-line phasing devices are read; thirdly, optimal computation is carried out based on the genetic optimization algorithm to obtain the optimal phasing phase sequence state order of the on-line phasing devices; lastly, the order is sent to the on-line phasing devices, and controllers of the on-line phasing devices execute the phasing operation after receiving the optimal phasing phase sequence state order. The method achieves the purpose of automatic low-voltage load on-line phasing, the unbalancing degree of the three-phase current of the outgoing line on the low voltage side of the distribution transformer is minimum, the power supply voltage quality is improved, and the loss is reduced.

Description

technical field [0001] The invention relates to the field of unbalanced control of three-phase loads in a low-voltage distribution network, in particular to an online phase modulation control method for low-voltage loads. Background technique [0002] The rural area is vast, the power users are numerous and scattered, the low-voltage lines in the rural distribution area are long, and there are a large number of single-phase loads with unbalanced time-space distribution, resulting in varying degrees of three-phase load imbalance in the low-voltage distribution network. balance problem. The unequal currents of the three phases lead to unbalanced currents on the neutral line, resulting in increased losses of distribution transformers and low-voltage lines, reduced actual output of distribution transformers, and easily causing low voltage for users on heavy-duty phases, which cannot meet the needs of rural residents. Normal production and domestic electricity demand. How to co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 方恒福盛万兴王金丽王金宇宋祺鹏
Owner STATE GRID CORP OF CHINA
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