CN-122001102-A - Power buffer system and method for high-power bidirectional wireless charging equipment

Abstract

The invention discloses a power buffer system and a power buffer method for high-power bidirectional wireless charging equipment, and relates to the technical field of wireless power transmission. The device integrates the super capacitor module and the power optimization controller on the receiving side, carries a high-power energy transmission buffer algorithm, and uses the super capacitor as the electric energy buffer of the energy storage battery of the device to stabilize the battery power and the charge and discharge power, so that high-power electric energy interaction between the global power grids is realized. And the DCDC output path is improved and designed, so that the problem of insufficient voltage under the working condition of the low electric quantity of the super capacitor is solved. The device can solve the problem of damage to the battery caused by high-power charging when the battery is fully charged and high-power discharging when the battery is low, and reduce damage to the battery caused by over-charge and over-discharge, high-power charging and discharging and the like.

Inventors

• LI XIAONING
• GU YUQIAN
• ZHANG XIAN

Assignees

• 河北工业大学

Dates

Publication Date

20260508

Application Date

20260213

Claims (10)

1. 1. The power buffer system for the high-power bidirectional wireless charging equipment is characterized by comprising a bidirectional wireless charging module and a power buffer management module; The bidirectional wireless charging module comprises a bidirectional inversion/rectifier, a compensation network and a coupling mechanism, wherein the bidirectional inversion/rectifier is connected with the coupling mechanism through the compensation network; The power supply side and the equipment side of the bidirectional wireless charging system are respectively provided with a bidirectional wireless charging module, and the power supply side and the equipment side are connected through a coupling mechanism corresponding to each bidirectional wireless charging module; the power buffer management module comprises a super capacitor and a power optimization controller, wherein the power optimization controller is connected with an inverter/rectifier at the equipment side through the super capacitor, the equipment side is connected with an energy storage battery through the power optimization controller, The power optimization controller comprises a bidirectional DCDC converter and a connection structure switching branch.
2. 2. The power buffer system of claim 1 wherein the power optimization controller comprises a bi-directional DCDC converter and a connection structure switching leg, wherein the connection structure switching leg comprises a power switching device and a compensation capacitor, wherein the power switching device is on, wherein the super capacitor and the DCDC converter are in a cascade mode, wherein the power switching device is off, wherein the super capacitor and the DCDC converter are in a series mode, and wherein the DCDC converter is in series with the super capacitor via the compensation capacitor.
3. 3. A power buffering method for a high-power bidirectional wireless charging device, for controlling the power buffering system according to claims 1 and 2, the control method comprising: s10, acquiring a target working mode of the energy storage battery through carrying equipment according to an external instruction, wherein the target working mode comprises a charging mode, a discharging mode and an electric quantity maintaining mode; S20, according to the target working mode and the real-time voltage of the super capacitor, carrying out working mode and output voltage adjustment processing through the power optimization controller, wherein the working mode comprises a cascade buck-boost mode and a series voltage compensation mode; S30, controlling the electric energy transmission direction and the transmission power through the bidirectional wireless charging module according to the target working mode and the real-time voltage of the super capacitor.
4. 4. The control method according to claim 3, wherein when the target operation mode is a charging mode, S20 includes: S210, if the real-time voltage of the super capacitor is higher than a first preset threshold value, a cascading buck-boost mode is executed through the power optimization controller, the super capacitor is utilized to supply power for the carrying equipment, and the energy storage battery is charged with a first charging power; S211, if the real-time voltage of the super capacitor is lower than the first preset threshold value, executing a series voltage compensation mode through the power optimization controller, utilizing the super capacitor to supply power to the carrying equipment, and suspending charging of the energy storage battery.
5. 5. The control method according to claim 4, wherein when the target operation mode is a charging mode and the carrying equipment reaches a wireless charging position, S30 includes: and S310, carrying out forward high-power electric energy transmission through the bidirectional wireless charging module to charge the super capacitor.
6. 6. A control method according to claim 3, wherein when the target operation mode is a discharge mode, S20 includes: s220, executing a reverse electric energy transmission mode through the power optimization controller, utilizing the energy storage battery to supply power for the carrying equipment, and charging the super capacitor with second charging power until the voltage of the super capacitor is higher than a second preset threshold value.
7. 7. The control method according to claim 6, wherein when the target operation mode is a discharge mode and the carrying equipment reaches a wireless charging position, S30 includes: And S320, carrying out reverse high-power electric energy transmission through the bidirectional wireless charging module, feeding power to the power grid side by utilizing the super capacitor, and simultaneously continuously controlling the energy storage battery to charge the super capacitor with the second charging power according to S220.
8. 8. The control method according to claim 3, wherein when the target operation mode is a charge holding mode, S20 includes: S230, the output voltage of the power optimization controller is matched with the voltage of the energy storage battery, and the power optimization controller is controlled to select a corresponding working mode according to the real-time voltage of the super capacitor.
9. 9. The control method according to claim 8, characterized in that S230 includes: S231, if the real-time voltage is higher than a third preset threshold value, performing a cascade buck-boost mode by the power optimization controller; S232, if the real-time voltage is lower than the third preset threshold value, the power optimization controller works in a series voltage compensation mode.
10. 10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when executed by a processor, is adapted to carry out the control method according to any one of claims 3-9.

Description

Power buffer system and method for high-power bidirectional wireless charging equipment Technical Field The invention discloses a power buffer system and a power buffer method for high-power bidirectional wireless charging equipment, and relates to the technical field of wireless power transmission. Background The high-power wireless power transmission technology (WPT) can be applied to mobile carrying equipment such as storage robots, AGVs, new energy buses and the like. Particularly, the application scene with relatively fixed working stop points realizes short-time high-power electricity supplementing by utilizing the WPT, thereby greatly expanding the endurance capacity of the equipment and reducing the capacity requirement of an energy storage battery. In addition, the power grid can be reversely powered, and the short-time energy storage power station function is realized by using the cluster carrying equipment. However, the energy storage battery has certain limitations on the charging power at high power and the discharging power at low power, the high power charging and discharging can accelerate the battery attenuation, and frequent charging and discharging can shorten the service life of the battery, so how to reduce the external charging and discharging power and frequency of the battery without affecting the input and output power requirements has great challenges. Super capacitors have extremely high power density, however, too low a low battery voltage also presents a problem for system stability. Disclosure of Invention Aiming at the problems in the prior art, the invention provides a power buffer system and a method for high-power bidirectional wireless charging equipment, which adopts the following technical scheme: In a first aspect, a power buffer system for a high-power bidirectional wireless charging device includes a bidirectional wireless charging module and a power buffer management module; The bidirectional wireless charging module comprises a bidirectional inversion/rectifier, a compensation network and a coupling mechanism, wherein the bidirectional inversion/rectifier is connected with the coupling mechanism through the compensation network; The power supply side and the equipment side of the bidirectional wireless charging system are respectively provided with a bidirectional wireless charging module, and the power supply side and the equipment side are connected through a coupling mechanism corresponding to each bidirectional wireless charging module; the power buffer management module comprises a super capacitor and a power optimization controller, wherein the power optimization controller is connected with an inverter/rectifier at the equipment side through the super capacitor, the equipment side is connected with an energy storage battery through the power optimization controller, The power optimization controller comprises a bidirectional DCDC converter and a connection structure switching branch. In some implementations, the power optimization controller comprises a bidirectional DCDC converter and a connection structure switching branch, wherein the connection structure switching branch comprises a power switching device and a compensation capacitor, the power switching device is conducted, the super capacitor and the DCDC converter are in a cascade mode, the power switching device is disconnected, the super capacitor and the DCDC converter are in a series mode, and the DCDC converter is connected with the super capacitor in series through the compensation capacitor. In a second aspect, an embodiment of the present invention provides a power buffering method for a high-power bidirectional wireless charging device, for controlling the power buffering system according to the first aspect, including: s10, acquiring a target working mode of the energy storage battery through carrying equipment according to an external instruction, wherein the target working mode comprises a charging mode, a discharging mode and an electric quantity maintaining mode; S20, according to the target working mode and the real-time voltage of the super capacitor, carrying out working mode and output voltage adjustment processing through the power optimization controller, wherein the working mode comprises a cascade buck-boost mode and a series voltage compensation mode; S30, controlling the electric energy transmission direction and the transmission power through the bidirectional wireless charging module according to the target working mode and the real-time voltage of the super capacitor. In some implementations, when the target operating mode is a charging mode, S20 includes: S210, if the real-time voltage of the super capacitor is higher than a first preset threshold value, a cascading buck-boost mode is executed through the power optimization controller, the super capacitor is utilized to supply power for the carrying equipment, and the energy storage battery is charged with a first charging p