Double-redundant power electronic transformer based alternating-current and direct-current hybrid system

Abstract

The invention provides a double-redundant power electronic transformer based alternating-current and direct-current hybrid system which comprises two multi-port power electronic transformer bodies, a10kV alternating-current bus, a 10kV direct-current bus, a 240V direct-current bus and a 380V alternating-current bus. The double-redundant power electronic transformers is connected to two 10kV alternating-current power supplies respectively, and the 10kV direct-current bus, the 240V direct-current bus and the 380V alternating-current bus of the power electronic transformer bodies are interconnected to form a looped network; the 10kV direct0current bus is used for receiving large-capacity remote photovoltaic and achieving flexible interconnection of two 10kV alternating-current power supply points; the 240V direct-current bus is used for receiving low-voltage photovoltaic, stored energy and the like and powering a direct-current load; the 380V alternating-current bus is used for receivinglow-voltage photovoltaic, wind electricity, solar energy and the like and powering an alternating-current load. The double-redundant power electronic transformer based alternating-current and direct-current hybrid system has the advantages that high power supply reliability of the alternating-current and direct-current loads is guaranteed, multilevel-conversion steps on source, charge and storagecan be effectively reduced, comprehensive energy utilization and system energy efficiency are improved, and auxiliary support is provided for power grids through switching of multi-operating conditions.

Description

technical field [0001] The invention relates to the technical field of AC-DC hybrid systems, in particular to an AC-DC hybrid system based on dual redundant power electronic transformers. Background technique [0002] Distributed renewable energy has become an important way to promote energy transformation. It is estimated that the proportion of non-water renewable energy will be as high as 43.44% in 2050, of which more than half are distributed renewable energy. Distributed renewable energy such as wind power, photovoltaics, and solar thermal power generation are generally connected to the grid through multi-level conversion links, and there is a lack of unified control and scheduling means, resulting in low overall energy efficiency of the system. On the load side, the proportion of generalized DC energy-consuming equipment represented by IT loads, inverter air conditioners, and electric vehicles has increased rapidly, and its conversion link has seriously reduced the ener...

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Problems solved by technology

[0005] The embodiment of the present invention provides an AC-DC hybrid system based on dual redundant power electronic transformers, which is used to solve the problem of low reliability of the traditional AC-DC hybrid system, large voltage fluctuation at the end of the busbar, limited energy access capability, and single operation mode, which cannot Technical Problems in Realizing Flexible Economic Operation

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