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Equal-zero-sequence-current phase-change switch type three-phase load automatic adjustment method and device

A technology of commutation switch and automatic adjustment, which is applied in the direction of reducing asymmetry of multi-phase network, eliminating/reducing asymmetry of multi-phase network, etc., and can solve problems such as three-phase load imbalance

Inactive Publication Date: 2018-10-23
珠海英泰利电力技术有限公司
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  • Abstract
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Problems solved by technology

[0011] Aiming at the problems in the prior art, the present invention provides an equal-zero-commutation switch-type three-phase load automatic adjustment method and device, which can solve the unbalanced three-phase load problem from the load side, so as to reduce transformer loss and low-voltage power supply line line loss. loss, to achieve the purpose of safe and economical operation

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[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0044] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second" and ...

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Abstract

The invention relates to an equal-zero-sequence-current phase-change switch type three-phase load automatic adjustment method and device, and relates to the technical field of power systems. The method comprises the steps: collecting a three-phase voltage value and a three-phase current value of a low-voltage outlet side circuit of a distribution transformer; determining the unbalance degree of athree-phase load, searching a to-be-switched equal-zero-sequence-current low-voltage load automatic phase-change switch and carrying out the pre-judgment of the unbalance degree of the three-phase load after load transfer. The method is suitable for a low-voltage side of the distribution transformer in a transformer region and is mainly used for the real-time and automatic distribution and adjustment (balancing) of the total load among three phases, and enabling the total load to be basically in a balance state, wherein the dynamic balance degree reaches the optimal value, and the current passing through a zero line is the minimum, thereby greatly reducing the loss of the transformer and the line loss of a low-voltage power supply line and improving the total load capacity of the transformer. Meanwhile, the method also can increase the supply voltage of the tail end of the low-voltage line (partly solving a low-voltage problem of the tail end), and greatly improves the power utilization quality.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to an equal-zero commutation switch-type three-phase load automatic adjustment method and device. Background technique [0002] In the distribution station area, the transformer is responsible for the important task of power distribution and transmission, and is the central hub of the distribution station area. The line network in the distribution station area is the channel for the transformer to transmit electric energy. A scientific and reasonable line network structure is an important guarantee for the transformer's safe, high-quality and low-loss power supply. The three-phase load balance is not only an important basis for the rationality of the line network structure in the balanced station area, but also the basic requirement for the normal operation of the transformer. Whether the three-phase load can be balanced is not only related to the reliability and stability of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50
Inventor 王翌霖仝猛徐焓娱刘洋孟凡钟杨兴举牛少伟王佑民魏绘敏
Owner 珠海英泰利电力技术有限公司
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