Multi-port microgrid energy router

Abstract

The invention provides a multi-port microgrid energy router. The router comprises a high-voltage network side converter port, a low-voltage alternating current load port, a low-voltage direct currentload port and an alternating current power distribution network. The low-voltage alternating-current load port and the low-voltage direct-current load port are connected to a direct-current bus through the high-voltage network side converter port, and are connected with the alternating-current power distribution network through the high-voltage network side converter port via a direct current bus.A high-voltage network side converter is used for realizing stable control of a direct-current bus voltage. When the voltage of the direct current bus exceeds a set range, the whole router is cut offto protect safety of the energy router and low-voltage side electrical equipment, the direct current bus is used for connecting a distributed power supply and energy storage equipment, and power flowand real-time energy balance of a system are reflected through a change condition of the voltage of the direct current bus. In the invention, interconnection and bidirectional energy transfer among different alternating current / direct current systems and different voltage grades can be realized, a standardized interface is provided for the electrical equipment, and bidirectional transmission of electric energy in the system is realized.

Description

technical field [0001] The invention relates to the technical fields of DC micro-grid and energy Internet, in particular to a multi-port micro-grid energy router. Background technique [0002] The power router is essentially a multi-port converter system with intelligent energy management. It draws on the concept and functions of the information router. sufficient supply. It transforms the micro-grid from a customized and construction system to a finalized and installed product, which is very conducive to the rapid industrialization of the micro-grid, and its own functions and intelligence are currently the focus of research. [0003] The energy router is the key technology of the Energy Internet. It is based on the existing power grid, based on advanced power electronics technology and information network technology, providing flexible and diverse electrical interfaces, and realizing a large number of distributed renewable energy generation equipment and energy storage equ...

AI Technical Summary

Problems solved by technology

[0004] The low switching frequency not only limits the dynamic performance of the system, but also leads to the large volume and weight of the system, and the huge operating noise; in addition, because the system does not provide a DC bus, it is not conducive to the access of distributed power sources and energy storage devices. The voltage level of the router is isolated and the power demand is large (usually 10kV and above voltage, megawatt capacity). For this type of energy router, the converter with high power and isolated voltage is the main problem. Current switching devices, the withstand voltage value of existing commercial high-power switching devices such as IGBT, IGBT, etc. is not enough to support its voltage level

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