Energy management system for grid-connected operation of wind and photovoltaic power storage micro-grid system

Abstract

The invention belongs to the technical field of distributed generating micro-grid systems, and provides an energy management system for the grid-connected operation of a wind and photovoltaic power storage micro-grid system, wherein the micro-grid system is connected to an alternating-current bus through a current conversion system and connected with a large power grid, and the factory load is also connected to the large power grid. The wind and photovoltaic power storage micro-grid system is composed of at least a wind driven generator unit, at least a photovoltaic power generation unit and at least an energy storage device. The micro-grid energy management system controls the grid-connected operation of the wind and photovoltaic power storage micro-grid system, and carries out starting, stopping and power control on each unit of the wind and photovoltaic power storage micro-grid system, so that each unit of the wind and photovoltaic power storage micro-grid system can run safely and stably, only supplies power to the factory load and does not supply power to the large power grid. According to the invention, through the energy management of the wind and photovoltaic power storage micro-grid system, each unit of the wind and photovoltaic power storage micro-grid system can carry out grid-connected operation safely; and when the factory load is changed, the energy management system carries out starting, stopping and power control on each unit of the wind and photovoltaic power storage micro-grid system, so that each unit of the wind and photovoltaic power storage micro-grid system can run safely and stably, only supplies power to the factory load and does not supply power to the large power grid.

Description

technical field [0001] The invention belongs to the technical field of distributed power generation micro-grid systems in electric power systems, and relates to an energy management system for a wind-solar-storage micro-grid system operating in a grid-connected mode. Background technique [0002] With the continuous development of distributed generation technology, the gradual exhaustion of conventional energy sources and the increasing environmental pollution, countries all over the world are paying more and more attention to distributed generation technology (Distributed Generation—DG). Distributed power generation generally refers to a small power generation system connected to the power distribution system that is modularized, distributed, and arranged near the user to provide power to the user. The distributed power generation system is in the form of a microgrid. It is the most effective way to exert the efficiency of the distributed power generation system to connect ...

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Problems solved by technology

[0005] According to the research on the existing microgrid system, the microgrid system has two operating modes: grid-connected and islanded. However, according to the current situation of my country's power system, there are still many technical standards and planning requirements for the decentralized small-capacity microgrid system to connect to the large power grid. Research, it is difficult to realize in a short period of time; the large-scale microgrid system connected to the large power grid has recently experienced a large-scale off-grid phenomenon, which has had a great impact on the large power grid. Further research; an energy management system suitable for the grid-connected operation of the wind-solar-storage micro-grid system in large factories, which can make the grid-connected output power of the wind-solar storage micro-grid system consumed by the load of the factory area, without sending power to the large power grid, and without changing the factory area The power flow direction with the large power grid reduces the cost of electricity in the factory area, and is a micro-grid system that can be fully promoted in the near future

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