Hybrid energy storage system coordination control method in alternating current microgrid off-network state

A hybrid energy storage system, energy storage system technology, applied in the field of coordinated control of hybrid energy storage systems, to achieve the effect of improving sustainable adjustment capability, simple principle, and smooth charging/discharging current

Active Publication Date: 2017-12-15
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the coordination control problem when the hybrid energy storage system participates in the voltage amplitude and frequency adjustment of the AC microgrid in the off-grid state

Method used

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  • Hybrid energy storage system coordination control method in alternating current microgrid off-network state
  • Hybrid energy storage system coordination control method in alternating current microgrid off-network state
  • Hybrid energy storage system coordination control method in alternating current microgrid off-network state

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0030] Such as figure 1 As shown, the present invention takes a simplified off-grid AC microgrid as the research object. The microgrid is mainly composed of photovoltaic arrays, single-phase DC-AC converters, lead-acid batteries, lithium batteries, bidirectional DC-AC converters, AC Load and other components. Among them, the photovoltaic array adopts a first-level energy conversion, and is connected to the AC bus of the microgrid through a unidirectional DC-AC converter and a step-up transformer. Under normal circumstances, the unidirectional DC-AC converter adopts a maximum power output control mode to maximize Photovoltaic power generation efficiency; storage battery and lithium battery are ...

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Abstract

The present invention discloses a hybrid energy storage system coordination control method in an alternating current microgrid off-network state. The hybrid energy storage system comprises a lithium battery, a storage battery, the bidirectional DC-AC convertor of the lithium battery and the bidirectional DC-AC convertor of the storage battery. In the control method, a lithium battery energy storage system is taken as a V/f source in a microgrid and employs Droop control; and a storage battery energy storage system employs power control to perform dynamic regulation of the active power of the lithium battery based on the microgrid voltage frequency to ensure that the charge state of the lithium battery is in a reasonable range. The lithium battery is configured to regulate the transient active power imbalance component to facilitate improving the system dynamic response capability; the storage battery is configured to regulate the stable state active power imbalance component to facilitate smooth storage battery charging/discharging current; and moreover, based on the local electrical quantity, the principle is simple and the realization is easy.

Description

technical field [0001] The invention relates to a coordinated control method for a hybrid energy storage system in an off-grid state of an AC microgrid, and belongs to the field of distributed energy storage control and its application in a microgrid. Background technique [0002] In microgrids, due to the obvious intermittent characteristics, fluctuations and uncertainties of distributed power sources (photovoltaics, wind turbines, etc.) and loads, energy storage systems are crucial to the stable operation of microgrids. Since the current common energy storage media cannot meet the system's requirements for both power response capability and storage capacity at the same time, there are certain limitations in using a single energy storage medium in a microgrid. Therefore, it is proposed to combine two or more Energy devices are combined to form a unified control hybrid energy storage system. [0003] In the existing research results on the coordinated control of hybrid ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/24H02J3/12
Inventor 常晓勇陈福锋李玉平王玉婷徐程骥
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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