Reliable and rapid battery depolarization charging and discharging control operation method
An operation method and discharge control technology, applied in the field of charging and discharging of energy storage batteries, can solve the problems of poor reliability, decreased converter efficiency, motor torque oscillation, etc., to speed up the charging and discharging speed and increase the charging and discharging current. , the effect of extending battery life
Active Publication Date: 2022-03-01
THE HONG KONG POLYTECHNIC UNIV SHENZHEN RES INST
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Problems solved by technology
The sinusoidal ripple current generated by AC charging and discharging of the battery is absorbed by the grid and the load, and the influence of the ripple power caused by SRC operation on the grid, motor, etc. has not received enough attention
When the battery is connected to the DC bus and the motor through a conventional DC-DC converter, when the battery is charged or discharged with the sinusoidal ripple current, the AC ripple power will be injected into the DC microgrid and the motor, causing harmonic pollution and motor torque oscillation
In addition, the AC ripple power will also cause the efficiency of the converter to decrease and the reliability to deteriorate
This brings new challenges to the design and control of battery DC-DC and DC-AC converters
Method used
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[0032] Under the control method provided by the present invention, the effect of battery discharge is as follows Image 6 . Image 6 (a) It can be seen that before 0.2 seconds, the expected value of the discharge current is i bref =10+sin(500·2πt)A, after 0.2 seconds, the expected value of discharge current is i bref =10+2sin(800·2πt)A, Image 6 As can be seen in (b), the discharge current can accurately and quickly track the changing current expectation. Image 6 (c) is the voltage of the energy storage element in the converter. It can be seen that the fluctuating voltage on the capacitor has the same frequency as the fluctuating component in the expected current value, and increases with the increase of the fluctuating current. Image 6 (d) is the current output by the converter to the grid. It can be seen that when the battery discharge current ripple becomes larger, the current output to the power grid can quickly return to the original DC current value, and there is n...
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The invention discloses a reliable and rapid battery depolarization charging and discharging control operation method, which comprises the following steps of: controlling a battery converter to realize that an energy storage element in the converter carries out sine ripple current charging and discharging on a battery when a power grid or an electric automobile carries out direct current charging and discharging on the battery; the generated sine fluctuation power is buffered by the reliable energy storage element. And depolarization charging and discharging based on sine ripple current can be carried out on the battery without influencing the power quality of a power grid and an electric vehicle side. The charging and discharging mode is beneficial to prolonging the service life of the battery, improving the reliability of the battery and the converter, increasing the charging and discharging power of the battery and accelerating the charging and discharging speed of the battery, and has a remarkable improvement effect on enhancing the response speed of the grid-connected battery and improving the dynamic driving performance of the electric vehicle.
Description
technical field [0001] The invention relates to a reliable and fast battery depolarization charge and discharge control operation method, which belongs to the field of charge and discharge of energy storage batteries. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices, electric vehicles, renewable energy storage, and other fields due to their high energy and power density, light weight, and no memory effect. In these applications, fast, efficient and reliable charge-discharge operation is a key consideration. To meet these requirements, many charging and discharging methods have been proposed. The traditional constant current and constant voltage (CC-CV) charging method has the advantages of convenient operation and high cost performance. However, these methods can lead to severe polarization of the battery, resulting in phenomena such as lithium plating, which shorten the battery life cycle and reduce the efficiency. To ove...
Claims
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IPC IPC(8): H02J7/00H02J7/04H01M10/44B60L53/62
CPCH02J7/007H02J7/0063H02J7/04H01M10/44B60L53/62H02J2207/40Y02E60/10Y02T10/70Y02T10/7072Y02T90/12
Inventor王明浩许昭
OwnerTHE HONG KONG POLYTECHNIC UNIV SHENZHEN RES INST