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Alternating current and direct current hybrid micro-grid system and control strategy thereof

An AC/DC hybrid and micro-grid technology, applied in the field of micro-grid systems, can solve problems such as unsatisfactory power supply reliability and limited energy of energy storage devices, and achieve the effect of ensuring long-term uninterrupted operation, optimizing operation, and maintaining stability

Active Publication Date: 2015-04-08
南京国臣信息自动化技术有限公司
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  • Description
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AI Technical Summary

Problems solved by technology

The existing AC microgrid and DC microgrid technologies cannot meet such high power supply reliability due to the limited energy of energy storage devices.

Method used

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  • Alternating current and direct current hybrid micro-grid system and control strategy thereof
  • Alternating current and direct current hybrid micro-grid system and control strategy thereof

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Embodiment Construction

[0029] The technical content of the present invention will be further described below in combination with specific implementation methods and accompanying drawings.

[0030] Such as figure 1 As shown, the AC-DC hybrid micro-grid system of the present invention includes 5 power generation units: a large power grid and its grid-connected AC / DC with a capacity of 40kW, a battery pack energy storage unit with a capacity of 30kW×2h and its energy storage DC / DC DC, maintaining energy balance through charging and discharging of energy storage units, 20kW photovoltaic power generation system and its photovoltaic DC / DC, 20kW wind power generation system and its wind DC / DC and diesel power generation system; also includes load and used to connect power generation unit and load Connected power distribution lines, loads include 10kW AC important load, 10kW AC / DC load (here refers to inverters that can supply AC or DC power supply), 10kW DC important load, 20kW AC non-important load and 5k...

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Abstract

The invention discloses an alternating current and direct current hybrid micro-grid system and a control strategy of the micro-grid system. The micro-grid system comprises multiple generation units, load, a distribution line for connecting the generation units and the loads, and a monitoring protection unit; each generation unit comprises a large power grid, grid-connected AC / DC (alternating current / direct current) of the large power grid, an energy storage system, a DC / DC (direct current / direct current) converter of the energy storage system, a wind power generation system, an AC / DC converter of the wind power generation system, a photovoltaic power generation system, a DC / DC converter of the photovoltaic power generation system, and a diesel generator; said load includes AC non-significant load, AC significant load, AC / DC load, DC significant load and DC non-significant load; the distribution line comprises a DC distribution line and an AC distribution line; the operating status of each energy conversion device can be monitored in real time by the monitoring protection unit, two operating ways such as grid connection and isolation of the system can be realized by different control strategies, the distributive generation unit and the energy storage unit realize coordination and cooperation by controlling energy storage DC / DC, photovoltaic DC / DC, and wind power AC / DC, so that the power supply reliability is improved and the significant load can continuously operate.

Description

technical field [0001] The present invention relates to a micro-grid system, in particular to an AC-DC hybrid micro-grid system, and also to a control strategy for the above-mentioned AC-DC hybrid micro-grid system. Background technique [0002] According to the definition of microgrid by CERTS (The Consortium for Electric Reliability Technology Solutions) in the United States, a microgrid is an independently controllable system composed of loads and distributed power sources DGs (Distributed Generations), which provides local electricity and heat. [0003] Due to the advantages of less pollution and flexible installation locations, distributed power generation DGs has developed rapidly in recent years, but a large number of DGs connected to the power grid has also produced some adverse effects. Compared with the large power grid, the micro grid is a more friendly way to accept distributed power. [0004] With the rapid development and wide application of new materials, inf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02J3/38H02J1/14H02J4/00
CPCY02E10/56
Inventor 陈文波王丽
Owner 南京国臣信息自动化技术有限公司
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