Modular direct-current microgrid architecture reconstruction mode and operation control method

Abstract

A modular direct-current microgrid architecture reconstruction mode and operation control method is characterized in that the converters of all modules are connected to the same direct-current bus ina modular direct-current microgrid based on a conventional energy router structure applied to an alternating-current and direct-current microgrid in order to form a generalized energy router structure; operation of a system is divided into three modes: a grid-connected PQ mode, a superior power grid participation regulation mode and an island mode, a modular direct-current microgrid architecture is realized based on thegeneralized energy router structure, information interaction and internal energy management are carried out by means of the architecture, a fault part is cut off in time, and architecture reconstruction is carried out. According to the invention, the number of circuit breakers in the DC microgrid can be reduced, flexible and reliable operation of the DC microgrid under any condition can be ensured to the greatest extent, minimum output of energy storage and a large power grid is ensured, the service life of a battery is prolonged, and the cost of purchasing power from the large power grid is reduced.

Description

technical field [0001] The invention belongs to the field of DC micro-grid modular structure and operation control, and relates to a modular DC micro-grid structure reconfiguration method and an operation control method thereof. Background technique [0002] In recent years, the proportion of distributed motors that can efficiently utilize clean energy in the power grid has gradually increased. Since the micro-grid is a system used to coordinate the contradiction between the large power grid and distributed power sources, it is the future intelligent power distribution system. It represents the development trend of the distributed energy power supply system in the future. Therefore, the National Energy Administration issued the "Guiding Opinions on Promoting the Construction of New Energy Micro-grid Demonstration Projects", "Action Plan for Construction and Transformation of Distribution Networks (2015-2020 "Notice" and other documents have greatly promoted the research and ...

AI Technical Summary

Problems solved by technology

The reason is that the DC microgrid lacks a large moment of inertia, resulting in too small output damping and low inertia, and is susceptible to frequent external interference and load fluctuations.

Among them, the most important thing is that the one-time investment of the microgrid project is large, the output is slow, and the technology is relatively complicated, so the internal demand for its construction and the driving force at the economic level are insufficient.

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