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Power grid black-start method with participation of regional small hydropower stations and new energy hybrid micro-grids

A microgrid and small hydropower technology, applied in the energy industry, electrical components, circuit devices, etc., can solve the problems of power supply diversity and uncertainty increasing the difficulty of operation control of interconnected large power grids, and achieve stable voltage and frequency, start-up The effect of fast speed and low power consumption

Inactive Publication Date: 2014-12-17
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The diversity and uncertainty of power sources significantly increase the difficulty of the operation and control of large interconnected power grids

Method used

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  • Power grid black-start method with participation of regional small hydropower stations and new energy hybrid micro-grids
  • Power grid black-start method with participation of regional small hydropower stations and new energy hybrid micro-grids
  • Power grid black-start method with participation of regional small hydropower stations and new energy hybrid micro-grids

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] The structural diagram of the regional small hydropower group new energy complementary microgrid is attached figure 1 As shown, it consists of energy storage, small hydropower, photovoltaics, wind power, and on-grid loads. The process of participating in the grid black start of the new energy complementary microgrid of the regional small hydropower group includes:

[0029] Select the black-start microgrid → select the optimal start-up path → start the microgrid → charge the line → deliver power to the load → expand and start the activated power source → parallel with the system.

[0030] The start-up process of the microgrid is attached figure 2 As shown, in the microgrid in the selected area, the energy storage system that can independently establish a stable AC bus voltage can be used as a black start power supply for the microgrid when the output terminal ...

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Abstract

The invention discloses a power grid black-start method with participation of regional small hydropower stations and new energy hybrid micro-grids. A process of the method includes selecting black-start micro-grids; selecting the optimal starting paths; starting the micro-grids; charging lines; transmitting power to loads; outwardly expanding and starting started power sources; interconnecting the micro-grids with systems. Energy storage systems in the micro-grids are used as black-start power sources when the micro-grids are started and run in V-F modes, so that voltages can be assuredly generated for buses of the micro-grids; present voltage frequency stability of the micro-grids can be guaranteed by means of invoking active power and reactive power which are outputted by the energy storage systems when the small hydropower stations and photovoltaic systems in the micro-grids are started. The power grid black-start method has the advantages that merits of simple auxiliary equipment, low auxiliary power consumption, high starting speeds and the like of the micro-grids are sufficiently utilized by the power grid black-start method, the micro-grids are used as the black-start power sources for power grids, accordingly, power failure durations of the power grids can be shortened, and normal running of the power grids can be restored as soon as possible; the power grid black-start method is applicable to black-start of the regional small hydropower stations and the new energy hybrid micro-grids.

Description

technical field [0001] The invention relates to a method for a complementary micro-grid to participate in a power grid black start, and belongs to the technical field of micro-grid applications. Background technique [0002] Power grid black start refers to the process of starting the units without self-starting ability in the system through the units with self-starting ability in the system or the external input power after the power system fails or collapses, and gradually restores the system to normal operation. The black start scheme is how to make reasonable use of this part of self-starting power to quickly restore the power grid to normal. [0003] Microgrid refers to a small power generation system composed of distributed power sources, energy storage devices, energy conversion devices, related loads and monitoring and protection devices. The power sources in the microgrid are mostly distributed power sources with small capacity, including micro gas turbines, fuel c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/38
CPCY02P80/14
Inventor 徐在德范瑞祥夏永洪赵景涛陈娜
Owner STATE GRID CORP OF CHINA
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