Method for treating three-phase load imbalance of low-voltage distribution network

A technology for unbalanced load and low-voltage distribution network, which is applied in the direction of eliminating/reducing asymmetry in multi-phase network, adjusting AC network voltage, reducing asymmetry in multi-phase network, etc., and can solve the unbalanced three-phase load in distribution area , unbalanced three-phase load, etc.

Inactive Publication Date: 2016-08-10
BEIJING TELLHOW ELECTRIC POWER TECH CO LTD
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Problems solved by technology

[0015] The purpose of the present invention is to provide a method for controlling the unbalanced three-phase load of the low-voltage distribution network. By adjusting the current of each phase

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  • Method for treating three-phase load imbalance of low-voltage distribution network
  • Method for treating three-phase load imbalance of low-voltage distribution network
  • Method for treating three-phase load imbalance of low-voltage distribution network

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Embodiment Construction

[0050] The invention will be described in detail below through specific embodiments. These embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0051] If "include" or "include" mentioned in the entire specification and claims is an open term, it should be interpreted as "including but not limited to". The following description of the specification is a preferred embodiment for implementing the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The protection scope of the present invention shall be subject to those defined by the appended claims.

[0052] A method to control the three-phase load imbalance of the low-voltage distribution network, including:

[0053] (1) First install the commutation switch on the side of the meter box (see the schematic di...

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Abstract

The invention discloses a method for controlling unbalanced three-phase loads of a low-voltage distribution network. The method uses a station area controller to collect three-phase current data on the low-voltage side of a distribution transformer, load data of an outlet leakage protection switch, and user power consumption data. The load data and the current and phase data of the commutation switch are analyzed and calculated to obtain the unbalance value of each outgoing line. When the unbalance is found to be greater than the set limit value, and the unbalance maintenance time exceeds the set adjustment time In this case, the optimal "unbalance adjustment method" is given, and the phase change switch is automatically controlled by remote control to adjust the load and complete the redistribution of the three-phase loads of each outgoing line, so that the three-phase loads of each outgoing line are in a basically balanced state, so as to achieve low-voltage line The three-phase load balance state. The invention realizes the redistribution of the single-phase load current by controlling the phase change switch installed on the side of the household meter box, so as to achieve the basic balance of each phase load.

Description

Technical field [0001] The invention belongs to the field of electric power technology, and specifically relates to a method for managing three-phase load imbalance in a low-voltage power distribution network. Background technique [0002] The current status of the distribution station area is: the rural power grid project transformation is not only large in scale and heavy in tasks, but also in tight time and limited funds. It is impossible to cover everything, especially during the construction of the household connection line, due to some construction personnel The quality is low, and there is basically no concept of three-phase load balance. During the construction process, either the single-phase load is randomly connected, or the single-phase load is connected to the middle two wires. These all cause the three-phase load imbalance to a certain extent Some phase loads seem to be relatively close, and the phase currents are also relatively close, but the neutral current is ve...

Claims

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Application Information

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IPC IPC(8): H02J3/26H02J3/14
CPCY02E40/50H02J3/26H02J3/14
Inventor 徐学均徐艳军张洪兴刘凯孙琦超
Owner BEIJING TELLHOW ELECTRIC POWER TECH CO LTD
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