Internal flexible networking system of power utilization enterprise with multiple distribution transformers

Abstract

The invention discloses a power enterprise internal flexible networking system with multiple distribution transformers. The system comprises multiple distribution transformers, wherein a low-voltage side of each distribution transformer is used for being connected with a power supply bus so as to achieve power distribution of a power load through the power supply bus, the system further comprisesa first bidirectional converter, an alternating current side port of each first bidirectional converter is electrically connected with the power supply bus corresponding to one distribution transformer, direct current side ports of the first bidirectional converter are interconnected through a direct current bus so that a net-shaped distribution network is formed among the plurality of distribution transformers. The system is advantaged in that a mesh connection network is formed among a plurality of distribution transformers, all the distribution transformers can be flexibly connected with one another, electric energy in the system can be migrated and distributed among all the distribution transformers along the grid-shaped distribution network, mutual power support, energy interaction, mutual voltage support and mutual emergency backup are achieved, enterprise distribution safety is guaranteed, and the utilization rate of electric power assets is increased.

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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