Modular energy storage system equalization circuit with bidirectional current capability
A bidirectional current, energy storage system technology, applied in charge equalization circuits, battery circuit devices, circuit devices, etc., can solve the problems of slow equalization speed and small equalization current, achieve fast equalization speed, improve equalization speed, and balance control freedom. high degree of effect
Active Publication Date: 2020-12-08
HARBIN ENG UNIV
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Problems solved by technology
When the voltages of the cells in the module are close (for example, the voltages of the cells of the lithium iron phosphate battery are still relatively close even when the capacity is unbalanced), the equalization current of the traditional multi-winding transformer equalization topology is small, resulting in a slow equalization speed
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[0028] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0029] The purpose of the present invention is to realize the rapid modular balance of large-scale energy storage systems, and propose a modular balanced topology with bidirectional current capability based on multi-winding transformers. This balanced topology can achieve greater Balanced current increases the speed of individual balance within the module, and the two-way flow of balanced current between modules increases the speed of balance between modules.
[0030] The multi-winding transformer-based modular balanced topology with bidirectional current capability proposed by the present invention is as follows: figure 1 shown. C in the picture ni (The subscript n is the module number, i is the unit number in the module, the same below) is the energy storage unit, i ni is the monomer balancing current, R eni is the equivalent internal ...
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The invention discloses a modular energy storage system equalization circuit with bidirectional current capability, an energy storage module comprises energy storage single bodies and a multi-windingtransformer which are connected in series, and the multi-winding transformer comprises primary side windings and secondary side windings of which the number is equal to that of the energy storage single bodies; the energy storage single bodies are connected with the primary side windings in parallel; a secondary side winding I is connected with the energy storage single bodies in series through adiode to form a closed loop; the bidirectional flow of equalizing current is controlled between the energy storage single bodies and the primary side windings through a bidirectional switch tube; a secondary side winding II is connected in series with an output capacitor through the switch tube to form a closed loop; the output capacitor and a half-bridge converter form a closed loop; the equalization circuit performs current equalization on the energy storage module; the output capacitor of the energy storage module is in cascade connection through the half-bridge converter. A cascade converter is connected to an energy storage system through a bidirectional DC / DC converter; according to the invention, the high-current equalization can be realized under the condition of any single voltage, the equalization current between the modules flows in two directions, and the equalization speed between the modules is high.
Description
technical field [0001] The invention relates to a modular energy storage system equalization circuit with bidirectional current capability, which belongs to the field of energy storage system equalization. Background technique [0002] Power-type energy storage systems play a vital role in systems such as microgrids, energy storage power stations, and hybrid ships. Energy storage systems generally consist of a large number of energy storage cells such as lithium batteries or supercapacitors connected in series and parallel. Due to differences in manufacturing processes and attenuation differences during use, the capacities of the cells in the energy storage system are inconsistent. In a high-power energy storage system that operates frequently, the difference in monomer capacity will lead to voltage differences, and eventually trigger the cut-off voltage, resulting in the inability to fully utilize the capacity of the energy storage system, and there are potential safety haz...
Claims
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Login to View More IPC IPC(8): H02M3/335H02J7/00
CPCH02M3/33584H02J7/0014
Inventor凡绍桂游江张强巩冰孟繁荣
OwnerHARBIN ENG UNIV