A supercapacitor voltage equalization method based on cooperative control and an equalization device thereof
A supercapacitor and cooperative control technology, applied in battery circuit devices, circuit devices, charge equalization circuits, etc., can solve problems such as differences in parameters and performance of supercapacitor monomers, aging of monomers, insufficient energy storage, etc., and achieve voltage balance Good effect, eliminate steady-state error, and improve energy storage efficiency
Active Publication Date: 2018-12-11
CENT SOUTH UNIV
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Problems solved by technology
However, due to factors such as manufacturing process and aging, the parameters and performance of super capacitors are different.
If the supercapacitor cells are not balanced, it may cause overcharge or insufficient energy storage of some cells in the series supercapacitor group, which will seriously affect the performance and life of the supercapacitor and energy storage system.
However, the existing equalization technology does not carry out the coordination between supercapacitor monomers. During the equalization process, there will be voltage oscillation or overcharge of some monomers, which cannot achieve true voltage balance and reduce the energy storage characteristics of the system. , resulting in rapid aging of the monomer
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[0054] The present invention will be further described below in conjunction with examples. see figure 1 , A supercapacitor voltage equalization device based on cooperative control provided in this embodiment includes: a cooperative control module 1 , a passive equalization circuit module 2 , a signal drive module 3 , a sensing acquisition module 4 and a power supply module 5 . Such as Figure 4 As shown, the passive equalization circuit module 2 includes supercapacitor cells connected in series and a balancing element for each supercapacitor cell, and the balancing element includes a series-connected switch resistor and a switch. In this embodiment, the signal for controlling the opening and closing of the switch is a PWM signal, so the existing semiconductor switch can be used as the switch. The balance of the supercapacitor monomer is carried out through the switch and the resistor, that is, whether to connect the resistor to control the charging rate of the supercapacitor...
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The invention discloses a supercapacitor voltage equalization method based on cooperative control and an equalization device thereof. The method comprises the following steps: 1. Collecting the terminal voltage of each super capacitor periodically in a charging process; Each supercapacitor unit is connected in series with each other, and each supercapacitor unit is connected in parallel with a series of switch resistors and switches respectively. 2, balancing the terminal voltages of each supercapacitor unit according to the terminal voltages collected each time, wherein the balancing processcomprises the following steps: inputting the terminal voltages and the average terminal voltages of each supercapacitor unit collected currently to a consistency tracker to obtain an error signal of each supercapacitor unit; Each error signal is input to an error compensator to obtain an equalization control signal of each supercapacitor unit; The switching of each switch is controlled according to the equalization control signal of each supercapacitor cell. The invention realizes the voltage balance of the supercapacitor cell by controlling the charge transfer between the supercapacitor celland the switching resistor.
Description
technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a supercapacitor voltage equalization method based on cooperative control and an equalization device thereof. Background technique [0002] In the practical application of supercapacitors, due to the limitation of its monomer voltage (0-2.7V), it is often necessary to connect the monomers in series. Ideally, the parameters and performance of supercapacitors of the same type should be completely consistent, that is, the charge and discharge curves of each supercapacitor are completely consistent. However, due to factors such as manufacturing process and aging, the parameters and performance of supercapacitors are different. If the supercapacitor cells are not balanced, some cells in the series supercapacitor bank may be overcharged or have insufficient energy storage, which will seriously affect the performance and life of the supercapacitor and energy storage...
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Login to View More IPC IPC(8): H02J7/34H02J7/00
CPCH02J7/0016H02J7/345
Inventor 刘伟荣黄志武周艳辉李恒张晓勇蒋富杨迎泽陈彬于文涛宋昱
Owner CENT SOUTH UNIV