A Flexible Networking System Inside Electric Enterprises with Multiple Distribution Transformers

Abstract

The invention discloses an internal flexible networking system of a power consumption enterprise with multiple distribution transformers, which includes a plurality of distribution transformers, and the low-voltage side of each distribution transformer is used to connect with a power supply bus to provide Electric load distribution; also includes a first bidirectional converter; the AC side port of each of the first bidirectional converters is electrically connected to the power supply bus corresponding to a distribution transformer, and each first bidirectional converter The DC side ports of converters are interconnected through DC busbars, so that a mesh distribution network is formed between a plurality of distribution transformers; a mesh connection network is formed between a plurality of distribution transformers in the present invention, and each distribution transformer All of them can be flexibly connected to each other, and the electric energy in the system can be migrated and distributed among the distribution transformers along the grid-shaped distribution network, so as to realize mutual support of power, energy interaction, mutual support of voltage, and mutual emergency backup, ensuring that enterprises Power distribution security and improved power asset utilization.

Description

technical field [0001] The invention belongs to the technical field of smart grids, and more specifically relates to a flexible networking system inside a power-consuming enterprise with multiple distribution transformers. Background technique [0002] The power supply and distribution system is generally composed of high-voltage distribution stations, high-voltage distribution lines, low-voltage substations, low-voltage distribution lines and electrical equipment. According to the voltage level provided by the public grid, at present, enterprises may need to carry out primary transformation or secondary transformation; the so-called primary transformation means that the 6-10KV voltage provided by the public grid is reduced to 380 / 220V voltage, and the electric energy is directly distributed to each Use of low-voltage electrical equipment; the secondary transformation needs to first reduce the 35-110KV voltage provided by the public grid to 6-10KV voltage, and then reduce th...

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Problems solved by technology

[0004] In the current multi-distribution transformer power grid system, the distribution transformers operate independently and are not connected to each other. The entire distribution system presents a radial structure. If some distribution transformers fail and power outages, the The multiple electrical loads connected to the distribution transformer will be out of service for a short time or for a long time; in addition, there is no effective means to redistribute the electric energy when there is uneven load between different distribution transformers; except for cutting off part of the electrical load In addition to reducing the load on distribution transformers, there is no other means to ensure distribution safety

Although a small number of enterprises will adopt the direct parallel operation of some low-voltage buses, this operation mode will bring the following problems: First, there may be uneven distribution between the two distribution transformers, and the distribution transformer with more output is prone to failure ; Second, once one of the distribution transformers fails, the entire distribution system will be completely paralyzed

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