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首页> 外文期刊>Journal of Energy Storage >Impact of balance resistor uncertainty on voltages across supercapacitors
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Impact of balance resistor uncertainty on voltages across supercapacitors

机译：平衡电阻不确定性对超级电容器两端电压的影响

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摘要

In some applications, due to a relative low operating voltage of a supercapacitor cell, it is necessary to connect it in series to achieve a required operating voltage. However, due to the variation of supercapacitor parameters, there is a voltage imbalance across the supercapacitors connected in series, hence they should be balanced (equalized) by means of an appropriate technique. For this purpose, several active and passive balancing techniques are used. In this paper, the technique of passive voltage balancing using resistors is described. The phenomenon and the physical cause of voltage imbalance on supercapacitor (SC) cells are explained in detail. The paper gives a mathematical model that accurately describes voltage balancing using resistors. An uncertainty analysis was introduced to describe the expected voltage variation of supercapacitors before and after passive voltage balancing using resistors. All relevant expressions which determine the expected voltage variation before and after implementation of voltage balancing are derived. The derived expressions allow determination of voltage variance and uncertainty on SCs in the most unfavorable case of voltage imbalance. Based on the presented theory and derived expressions, the guidelines in the implementation of passive techniques for voltage balancing using resistors are given.
机译：在一些应用中，由于超级电容器单元的相对较低的工作电压，因此有必要将其串联以实现所需的工作电压。但是，由于超级电容器参数的变化，在串联连接的超级电容器之间存在电压不平衡，因此应通过适当的技术对其进行平衡（均衡）。为此，使用了几种主动和被动平衡技术。在本文中，描述了使用电阻器进行无源电压平衡的技术。详细说明了超级电容器（SC）电池上电压不平衡的现象和物理原因。本文提供了一个数学模型，可以准确地描述使用电阻的电压平衡。引入了不确定性分析，以描述在使用电阻器进行无源电压平衡之前和之后，超级电容器的预期电压变化。得出确定电压平衡实施之前和之后的预期电压变化的所有相关表达式。导出的表达式可以确定最不利的电压不平衡情况下的电压变化和SC的不确定性。基于提出的理论和导出的表达式，给出了使用电阻器实现电压平衡的无源技术的实施准则。

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