Power distribution network system based on power electronic transformer AC-DC hybrid networking

Abstract

The invention discloses a power distribution network system based on the alternating current and direct current hybrid networking of a power electronic transformer, and the system comprises a large power grid, a distributed renewable energy end, a load end and the power electronic transformer, and is characterized in that the distributed renewable energy end serves as a standby power supply to supply power to the load end during the input voltage middle end period of the large power grid; and the distributed renewable energy end transmits the electric energy converted by the distributed renewable energy terminal to the large power grid through the power electronic transformer during the power consumption valley period so as to realize the bidirectional transmission of power and avoid interference to a main grid when the distributed renewable energy terminal is accessed to the large power grid. Through the cooperative cooperation of the large power grid and the distributed energy and the bidirectional flow of power, the optimized operation and control of the power grid are facilitated, interference to the main grid when traditional distributed energy is connected to the large powergrid is avoided, meanwhile, different voltage types are adopted for power supply according to different load requirements, the energy transmission efficiency is greatly improved, and the energy loss is reduced.

Description

Technical field[0001]The invention relates to the technical field of power distribution networks, and in particular to a power distribution network system based on a power electronic transformer AC and DC hybrid networking.Background technique[0002]At present, distributed renewable energy has become an important way to promote the energy transition. It has great development potential in my country's load-intensive areas, especially coastal areas. The proportion of generalized DC energy-consuming equipment represented by IT-type loads, inverter air conditioners and electric vehicles is rapidly increasing. High, its converter link severely reduces the energy efficiency of the system. Facing the significant demand for reliable consumption of distributed renewable energy and economic energy use of DC loads, AC / DC hybrid power grids have obvious advantages in terms of economy, reliability and flexibility.[0003]At present, the problems of high AC and DC energy conversion loss, poor flexib...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a distribution network system based on AC-DC hybrid networking of power electronic transformers to solve the problems of high AC-DC energy conversion loss, poor power distribution flexibility and matching of power distribution links in the prior art distribution network low technical issues

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