Method for detecting state of charge of series super-capacitor bank for urban rail vehicle
A supercapacitor and state-of-charge technology, which is applied in the direction of instruments, measuring electronics, and measuring devices, can solve the problems of inability to accurately detect the state of charge of supercapacitors, dependence on detection accuracy, and inability to determine SOC.
Active Publication Date: 2014-02-19
CHUANGQU SHANGHAI NEW ENERGY TECH CO LTD
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Problems solved by technology
The main disadvantages of this method are: 1) the SOC of the supercapacitor in the initial state cannot be determined; 2) the detection accuracy largely depends on the accuracy of the current sensor
Therefore, the ampere time method alone cannot accurately detect the state of charge of the supercapacitor
Method used
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[0041] Before implementing the SOC estimation method of series supercapacitor bank, it is necessary to know in advance figure 1 The parameters R, C and initial total capacity Q of the determined supercapacitor single model 0 . These parameters are measured and given by the supplier through experiments before the supercapacitor leaves the factory.
[0042] figure 2 and image 3 Describe the specific embodiment of the present invention as follows:
[0043] First, according to the attached figure 1 The classical equivalent circuit model of the supercapacitor monomer shown can be obtained as follows:
[0044] u c (t)=I(t)R+U(t)(1)
[0045] I ( t ) = C du c dt - - - ( 2 )
[0046] S ( t ) ...
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The invention relates to a method for detecting the state of charge of a series super-capacitor bank for an urban rail vehicle. The method comprises the following steps of: (1) real-timely collecting a charge current value, a discharge current value, and a terminal voltage value of each single super-capacitor when the series super-capacitor bank works; (2) computing a state value of charge of each single super-capacitor according to the current values and the voltage values; (3) determining a maximum value SOCmax and a minimum value SOCmin of the state of charge of a single body of the current series super-capacitor bank through compassion; (4) judging and respectively determining the state value of charge of the series super-capacitor bank when a train is started and braked; and (5) returning to the step (1), and real-timely detecting the state of charge of the series super-capacitor bank. Compared with the prior art, according to the method provided by the invention, each single body in the series super-capacitor bank cannot cause overcharge, overdischarge or other phenomena, so that the service life of the series super-capacitor bank can be prolonged, the safety of a whole energy storage system is ensured simultaneously, and the like.
Description
technical field [0001] The invention relates to the technical field of supercapacitor bank energy management systems, in particular to a method for detecting the state of charge of a series supercapacitor bank for urban rail vehicles. Background technique [0002] In today's world, energy issues have increasingly become an important issue restricting economic and social development. Energy saving, emission reduction, low carbon, and environmental protection have become new themes of energy utilization. As the main means of transport in urban traffic - rail transport is no exception. The remarkable feature of urban rail transit is that the distance between stations is short, so the starting and braking operations of urban rail vehicles are relatively frequent in actual operation. In the past, the energy generated by the braking of urban rail vehicles was treated by dissipating it on the braking resistor, but this method not only wastes energy, but also aggravates the proble...
Claims
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IPC IPC(8): G01R31/36
Inventor 姚勇涛张逸成赵洋梁海泉沈玉琢沈小军袁登科韦莉孙家南周云锋刘帅
Owner CHUANGQU SHANGHAI NEW ENERGY TECH CO LTD