SoC (State of Charge) balance control method of serial mixed energy storage three-port converter

A balanced control and series hybrid technology, which is applied in the direction of charge equalization circuit, current collector, electric vehicle, etc., can solve the problems of complicated implementation and inapplicability of series hybrid energy storage system, so as to solve the problem of stable operation variation and realize SoC self-recovery Effect

Active Publication Date: 2019-08-06
HARBIN INST OF TECH
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Problems solved by technology

However, the implementation of this control method is relatively complicated, and it only realizes the SoC balance of supercapacitors in traditional two-port converters, and is not suitable for series hybrid energy storage systems that include batteries and supercapacitors at the same time.

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  • SoC (State of Charge) balance control method of serial mixed energy storage three-port converter
  • SoC (State of Charge) balance control method of serial mixed energy storage three-port converter
  • SoC (State of Charge) balance control method of serial mixed energy storage three-port converter

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Embodiment Construction

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0029] The present invention proposes a state-of-charge balance control method for a series hybrid energy storage three-port converter. On the basis of realizing a reasonable power distribution between the storage battery and the supercapacitor in a single hybrid energy storage three-port converter, the outer loop is used to SoC control ensures the realization of functions such as battery SoC balance, supercapacitor SoC self-recovery, and output vol...

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Abstract

The invention provides an SoC balance control method of a serial mixed energy storage three-port converter. The control method mainly comprises outer-ring SoC balance control and inner-ring voltage and current control, SoC balance of a storage battery is realized in the outer ring, inner-ring control is composed of voltage and current closed-loop adjustment, and power distribution of the mixed energy storage system and stability of the output voltage of the converter are realized on the basis of virtual impedance control. The provided control method is simple and effective, modularized designis easy to realize, and stable system voltage output is realized while SoC balance of mixed energy storage components is realized.

Description

technical field [0001] The invention belongs to the technical field of converter control, and in particular relates to a state-of-charge equalization control method of a series hybrid energy storage three-port converter. Background technique [0002] In the DC power system, the hybrid energy storage system formed by the combination of supercapacitors and batteries can effectively alleviate the power fluctuations in the power system and improve the output performance and service life of the energy storage system. In order to meet the needs of DC power systems with higher voltage levels, it is necessary to connect the output side of the hybrid energy storage three-port converter in series, but the state of charge (SoC) of the energy storage element in the series hybrid energy storage three-port converter will be different. Problems such as balance and output voltage inconsistency between converters will affect the stable operation of the entire system. [0003] For the DC ene...

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Application Information

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IPC IPC(8): H02J7/34H02J7/00
CPCH02J7/0014H02J7/34H02J7/345
Inventor 王盼宝王凯峰任鹏陈彦博王卫徐殿国
Owner HARBIN INST OF TECH
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