Microgrid system and microgrid power supply method

Abstract

The invention provides a microgrid system and a microgrid power supply method. The system comprises an alternating-current bus. An intelligent power distribution device is connected with an alternating-current bus, an alternating-current load and a bidirectional converter. The bidirectional converter is connected with a direct-current bus. The direct-current bus is connected with a current-direct load, and is also connected with a plurality of direct-current charging terminals and energy storage batteries through a plurality of first DC / DC modules. The direct-current charging terminals are used for being connected with electric cars. The first DC / DC modules transform voltages provided by the direct-current bus into rated voltages during charging of the electric cars and the energy storage batteries, and transform voltages during discharging of the electric cars and the energy storage batteries into the voltages of the direct-current bus. The microgrid system has the advantages that the electric cars are accessed into the whole microgrid system and become large-scale movable energy storage equipment controllable in capacity and time, and the problems of insufficiency in energy storage capacity and regulation capacity in ordinary microgrid systems are solved.

Description

technical field [0001] The invention relates to the technical field of power transformation and distribution, in particular to a microgrid system and a microgrid power supply method. Background technique [0002] Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, loads, monitoring, protection devices, etc. according to a certain topology. It can run in parallel with the external power grid or in isolation. Due to the dual pressure of environmental protection and energy depletion, the development potential of distributed energy industry in universities is huge. The requirement to improve the reliability and quality of power supply and the total constraints brought by long-distance power transmission are driving the establishment of corresponding power sources close to the load center. Microgrid has become an increasingly important power supply method. [0003] The cur...

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Problems solved by technology

[0004] However, with the increase of the load pressure of the microgrid system, the microgrid system needs to have higher and higher energy storage capacity, and the energy storage capacity and quantity of the energy storage battery are limited, which cannot be increased without limit, and only rely on energy storage devices such as batteries It is already difficult to meet the current demand for electricity

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