Droop control method for improving throughput capacity and prolonging service life of micro-grid energy storage battery
A technology of energy storage battery and throughput capacity, which is applied in battery/fuel cell control devices, vehicle energy storage, current collectors, etc. It can solve the problems of ignoring the current rate, discharge depth, and battery life, so as to promote efficient utilization and reduce Negative effect, the effect of reducing the loss speed
Active Publication Date: 2020-05-15
WUHAN UNIV OF TECH
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[0006] In order to solve the problem that the existing control method in the background technology ignores the influence of the current rate and the depth of discharge on the service life of the battery, the present invention provides a droop control and battery management that can improve the throughput capacity of the energy storage battery and the service life of the battery method
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[0038] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.
[0039] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...
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The invention provides a droop control method for improving the throughput capacity and prolonging the service life of a micro-grid energy storage battery, which is characterized in by connecting a plurality of energy storage bidirectional converters in parallel to a power grid bus, wherein each energy storage bidirectional converter controls a group of batteries to be charged and discharged; determining the maximum current multiplying power allowed to be output by the battery according to the detected terminal voltage of each group of batteries; determining a droop control algorithm by usingthe state of charge (SoC) of the battery and the maximum current multiplying power allowed to be output by the battery, and distributing the power grid load by using the droop control; continuously estimating the SoC of the battery, and when the SoC reaches a set upper limit value, converting the battery from a charging state to a discharging state; and when the SoC reaches a set lower limit value, converting the battery into the charging state from the discharging state. According to the method, the influence of multiple factors such as discharge depth and current multiplying power can be processed, the electric quantity throughput capacity of the battery is improved, the service life of the battery is prolonged, and the cost of an energy storage system is reduced.
Description
[0001] technology neighborhood [0002] The invention relates to the field of battery management technology of a battery energy storage system, and more specifically relates to a battery management method for improving battery power throughput and prolonging battery life. Background technique [0003] In recent years, the development prospect of electric vehicles has become more and more promising. However, the problems caused by the decommissioning of electric vehicle power batteries have not been well resolved. In fact, the service life of a power battery is about 20 years from the beginning of use to the complete depletion of battery energy. However, when the power battery can only be charged to 80% of its original capacity, it is not suitable for continued use in electric vehicles. This process may only take 5 to 8 years. If it is scrapped at this time for resource processing, it will cause a waste of resources. Therefore, consider using these decommissioned batteries fo...
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IPC IPC(8): B60L58/16B60L58/12B60L55/00
CPCB60L55/00B60L58/12B60L58/16Y02T10/70
Inventor 刘芙蓉章雄谢长君
Owner WUHAN UNIV OF TECH