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Three-phase imbalance automatic commutation system

An automatic, three-phase technology, applied in the direction of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, reactive power compensation, etc. It can solve the problems of high load regulation efficiency and three-phase unbalance of the end-user voltage.

Pending Publication Date: 2020-12-01
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Based on this, it is necessary to provide a three-phase unbalanced automatic commutation system for how to solve the problem of unbalanced three-phase voltage of end users and the problem of high load regulation efficiency.

Method used

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Embodiment Construction

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. A preferred embodiment of the invention is shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to understand the disclosure content of the present invention more thoroughly and comprehensively.

[0024] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "left", "right", "upper", "lower", "front", "rear", "ci...

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Abstract

The invention relates to the technical field of power supply and distribution devices, and discloses a three-phase imbalance automatic commutation system. Current information of each phase of a three-phase branch in a power grid system is collected through a collection module, a main control module obtains the three-phase unbalance degree of the system according to the current information, and when the three-phase unbalance degree is larger than a preset threshold value, it is judged that phase change processing needs to be carried out. And the main control module compares the circuit information of each phase to judge an overload phase in the three phases. A current zero-crossing detection module detects a current zero-crossing point of three phases, and the main control module outputs acorresponding commutation control signal when the current of an overload phase crosses zero. And an automatic commutation module completes an automatic commutation process according to the commutationcontrol signal. By means of the three-phase imbalance automatic commutation system, an operator can complete automatic commutation under the condition that the tail end load is not powered off, the problem of three-phase imbalance of the tail end load is fundamentally solved, the tedious process of manual commutation is avoided, and the commutation efficiency and the power supply reliability of the system are greatly improved.

Description

technical field [0001] The invention relates to the technical field of power supply and distribution devices, in particular to a three-phase unbalanced automatic phase change system. Background technique [0002] Three-phase unbalance is an important indicator of power quality. Generally, the unbalanced situation is mostly due to the components, line parameters or load asymmetry in the three-phase branch circuit. The unbalanced three-phase load in the distribution station area will increase the line loss of the station area, which will have a negative impact on the power supply security, power supply quality and economic operation of the distribution network. At present, there are few voltage quality control measures for three-phase loads in power distribution systems. The problem of three-phase unbalance of end-user voltage cannot be solved by installing reactive power compensation equipment such as SVG, and it is difficult to adapt to the diverse needs of system load regu...

Claims

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Application Information

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IPC IPC(8): H02J3/26H02J3/18
CPCH02J3/18H02J3/26Y02E40/30Y02E40/50
Inventor 许阔葛馨远陈剑孙峥赵书妍邹宇轩邓焱陈玫冰纪依珩
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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