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

An energy management system, wind-solar storage technology, applied in wind power generation, single-grid parallel feeding arrangement, energy industry, etc., can solve problems such as difficult to realize, large-capacity micro-grid system off-grid, impact of large power grid, etc., to achieve power generation Stabilization, improved utilization, and real-time power smoothing effects

Active Publication Date: 2014-08-27
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Embodiment Construction

[0031] see figure 1 The wind-solar storage micro-grid system proposed by the present invention consists of one or more large-scale wind turbines, one or more photovoltaic units, lithium battery energy storage devices and a micro-grid energy management system. Wind turbines, photovoltaic units, and energy storage devices are all connected to the AC bus through the converter system, and are connected to the large power grid. The invention enables each unit of wind-solar storage to be connected to the grid safely through the energy management of the wind-solar storage micro-grid system. When the load of the plant area changes, the energy management system starts, stops and controls the power of each unit of wind-solar storage, and each unit of wind-solar storage It can operate safely and stably, and only supply power to the load in the plant area, not to the large power grid.

[0032] The basic way of grid-connected operation of wind-solar-storage microgrid system is as follows:...

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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 power systems, and relates to an energy management system in which a wind-solar storage micro-grid system operates in a grid-connected mode. Background technique [0002] With the continuous development of distributed generation technology, the gradual depletion of conventional energy and the increasing environmental pollution, countries around the world are increasingly paying attention to distributed generation (DG). Distributed power generation generally refers to a modular, decentralized, small-scale power generation system connected to the distribution system with a power generation of several kilowatts to several megawatts, which is arranged near the user to supply 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 by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/28H02J3/46
CPCY02E10/763Y02E10/766Y02E70/30Y02E10/76Y02P80/14Y02P80/20
Inventor 田军唐健刘征宇于海坤刘静波肖文静
Owner DONGFANG ELECTRIC CORP LTD
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