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Hybrid energy storage control method for off-grid DC microgrid voltage control

A DC micro-grid, voltage control technology, applied in parallel operation of DC power supply, battery circuit devices, current collectors, etc., to achieve the effect of improving sustainable regulation ability, prolonging cycle life, ensuring fast response and compensation ability

Active Publication Date: 2019-09-10
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the power command control mode will no longer apply

Method used

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  • Hybrid energy storage control method for off-grid DC microgrid voltage control
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  • Hybrid energy storage control method for off-grid DC microgrid voltage control

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Such as figure 1 As shown, the present invention takes a simplified off-grid DC microgrid as the research object. The microgrid is mainly composed of photovoltaic arrays, unidirectional DC-DC converters, batteries, supercapacitors, bidirectional DC-DC converters, loads and other parts composition. Among them, the photovoltaic array is connected to the DC bus through a unidirectional DC-DC converter. Under normal circumstances, the unidirectional DC-DC converter adopts the maximum power output control mode; into the DC bus.

[0030] When the photovoltaic array is full of solar energy during the day, the electric energy generated by the "photovoltaic" effect passes through the unidirectional DC-DC converter to supply power to the load on the DC bus of the system, and the excess electric energy is used for hybrid energy storage on the DC bus. The system is charg...

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Abstract

The invention discloses a hybrid energy storage control method suitable for voltage control of an off-grid type DC microgrid. The system consists of a supercapacitor, a storage battery, and respective bidirectional DC-DC converters. The method comprises the steps that a supercapacitor energy storage system employs voltage-power sag control, and maintains the stable voltage of a DC microgrid bus; a storage battery energy storage system carries out the real-time estimation and adjustment of the remaining capacity of the supercapacity according to the voltage change of the DC bus, and indirectly carries out the compensation for the non-instantaneous power fluctuation in the system. The beneficial effects of the invention are that the system gives play to the performance advantages of all energy storage devices in the system, improves the sustainable adjustment capability of the supercapacitor, and enables the current of a storage battery to be smooth.

Description

technical field [0001] The invention relates to a hybrid energy storage control method suitable for voltage control of an off-grid DC microgrid, and belongs to the technical field of energy storage control and application. Background technique [0002] The proposal of microgrid provides a platform for the distributed access of high proportion of renewable energy. With the increasing penetration of distributed power sources such as wind power and photovoltaic power generation, the operational stability of microgrids has been severely challenged. In order to solve the randomness, fluctuation and uncertainty of the power supply and load in the microgrid, and improve the stability of the microgrid operation, it is usually necessary to add energy storage devices to the system. Due to the limitation of energy storage performance, a single energy storage medium is still unable to meet the energy and power requirements of the system at the same time, so the hybrid energy storage sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10H02J7/34
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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