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Method for micro-grid system coordinated control based on multi-element composite energy storage

A multi-component, coordinated control technology, applied in energy storage, AC network load balancing, single-network parallel feeding arrangement, etc., can solve the problems of high cost and technical difficulties of superconducting magnetic energy storage, and achieve smooth long-term fluctuations. , the effect of smoothing the instantaneous high power fluctuation and improving the utilization rate of renewable energy

Active Publication Date: 2014-09-03
STATE GRID CORP OF CHINA +1
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Problems solved by technology

According to the current technical level, the costs of flywheels, supercapacitors, and superconducting magnetic energy storage are relatively high, and there are certain technical difficulties in achieving large capacity. Generally, they are only suitable for dynamic power compensation in microgrids to smooth power and stabilize energy storage. voltage or as a short-term emergency backup power

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  • Method for micro-grid system coordinated control based on multi-element composite energy storage

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Embodiment Construction

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

[0028] The purpose of the present invention is to propose a coordinated control strategy that can maintain the safe and stable operation of the microgrid on the basis of considering the multi-distributed power sources existing in the microgrid. In a micro-grid containing multiple distributed power generation equipment, the distributed power generation equipment is coordinated and controlled to ensure that each equipment can coordinate actions in a timely, accurate and rapid manner.

[0029] Taking photovoltaic microgrid system as an example, figure 1 It is the topological structure of photovoltaic microgrid hierarchical monitoring and management system based on multi-element composite energy storage. The microgrid monitoring and management system conducts comprehensive management and control from three levels: distribution network dispatching layer, microgri...

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Abstract

The invention provides a method for micro-grid system coordinated control based on multi-element composite energy storage. The method includes the steps that a flywheel energy storage unit is additionally arranged so that output fluctuation of voltage can be restrained; when a micro-grid system is in grid-connected operation, a battery energy storage unit and the flywheel energy storage unit restrain output fluctuation of a distributed generation unit; when the micro-grid system is in off-grid operation, the battery energy storage unit and a diesel generator alternately serve as a main power source of the micro-grid system; when grid-connected operation and off-grid operation of the micro-grid system are switched, the flywheel energy storage unit and the diesel generator provide power support. Through the method, the use rate of renewable energy sources is improved, optimal operation of power grids is achieved, instant high-power fluctuation and long time scale fluctuation of photovoltaic output are restrained, each distributed generation device is controlled in a coordinated mode, and timely, accurate and rapid coordination action of the devices can be guaranteed.

Description

technical field [0001] The invention relates to a control method for a micro-grid system, in particular to a coordinated control method for a micro-grid system based on multi-element composite energy storage. Background technique [0002] With the accelerated development of industrialization and urbanization and the continuous deepening of economic globalization, energy has attracted more and more attention from the whole society, and the requirements for energy security, environmental protection and response to climate change have become increasingly severe and prominent. It is urgent and urgent to optimize the energy structure, implement energy diversification and clean development, vigorously improve and adjust the energy structure, and effectively ensure energy supply. Actively seeking and vigorously developing renewable energy power generation and new energy power generation has far-reaching practical and historical significance. In this context, micro-grid technology ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/28
CPCY02E70/30Y02E10/563Y02E10/566Y02E10/56
Inventor 李建林房凯徐少华惠东
Owner STATE GRID CORP OF CHINA
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