Methods and apparatus for controlling an inverter
US-2024421599-A1 · Dec 19, 2024 · US
Electrical energy storage system and energy storage system
US12212142B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12212142-B2 |
| Application number | US-202318362728-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 31, 2023 |
| Priority date | Jun 17, 2020 |
| Publication date | Jan 28, 2025 |
| Grant date | Jan 28, 2025 |
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- Title
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- Abstract
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Abstract
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An electrical energy storage system is provided in this disclosure, which includes: M battery packs; M first DC/DC converters, where first terminals of the M first DC/DC converters are respectively connected to the M battery packs, the M first DC/DC converters are classified into N first DC/DC converter sets; and N second DC/DC converters, where the N second DC/DC converters one-to-one correspond to the N first DC/DC converter sets, a first terminal of each second DC/DC converter is connected to second terminals of all first DC/DC converters in a first DC/DC converter set corresponding to the second DC/DC converter, a second terminal of each second DC/DC converter is connected to a first interface of the electrical energy storage system, the first interface is to receive a direct current from a power generation system or output a direct current to the power generation system.
First claim
Opening claim text (preview).
What is claimed is: 1. An energy storage system, wherein the system comprises an electrical energy storage system and a power generation system; wherein the electrical energy storage system comprises two group of battery packs; two group of direct current to direct current (DC/DC) converters, each group comprising a plurality of first (DC/DC converters, wherein first terminals of the first DC/DC converters are respectively connected to the battery packs in the same group; and each group comprising of the DC/DC converters further comprising second DC/DC converters, a first terminal of each second DC/DC converter is connected to second terminals of one first DC/DC converter in the same group, a second terminal of each second DC/DC converter is connected to a first interface of the electrical energy storage system, the first interface is configured to receive a direct current from a power generation system or output a direct current to the power generation system; wherein one of the first DC/DC converters configured to switch between a boost mode, a buck mode, and a pass-through mode according to a voltage difference between the connected battery pack voltage and a second terminal voltage of the corresponding first DC/DC converter. 2. The energy storage system according to claim 1 , wherein when Vinv−Vbus>Vth and a battery pack is discharged, the second DC/DC converter is configured to boost Vbus to output Vinv; or when Vinv−Vbus>Vth and a battery pack is charged, the second DC/DC converter is configured to buck Vinv to output Vbus, wherein Vinv represents a rated voltage of the second terminal of the second DC/DC converter, Vbus represents a rated voltage of the first terminal of the second DC/DC converter, and Vth represents a preset threshold voltage. 3. The energy storage system according to claim 1 , wherein when −Vth≤Vinv−Vbus<Vth, the second DC/DC converter works in a direct mode, wherein Vinv represents the rated voltage of the second terminal of the second DC/DC converter, Vbus represents the rated voltage of the first terminal of the second DC/DC converter, and Vth represents the preset threshold voltage. 4. The energy storage system according to claim 1 , wherein when Vinv−Vbus<−Vth and the battery pack is discharged, the second DC/DC converter is configured to buck Vbus to output Vinv; or when Vinv−Vbus>Vth and the battery pack is charged, the second DC/DC converter is configured to boost Vinv to output Vbus, wherein Vinv represents the rated voltage of the second terminal of the second DC/DC converter, Vbus represents the rated voltage of the first terminal of the second DC/DC converter, and Vth represents the preset threshold voltage. 5. The energy storage system according to claim 1 , wherein when Vbus>Vbat and the battery pack is discharged, the first DC/DC converter is configured to boost Vbat to output Vbus; or when Vbus>Vbat and the battery pack is charged, the first DC/DC converter is configured to buck Vbus to output Vbat, wherein Vbus represents the rated voltage of the first terminal of the second DC/DC converter, and Vbat represents a rated voltage of an anode of the battery pack. 6. The energy storage system according to claim 1 , wherein when Vbus=Vbat, the first DC/DC converter works in the direct mode, wherein Vbus represents the rated voltage of the first terminal of the second DC/DC converter, and Vbat represents the rated voltage of the anode of the battery pack. 7. The energy storage system according to claim 1 , wherein when Vbus<Vbat and the battery pack is discharged, the first DC/DC converter is configured to buck Vbat to output Vbus; or when Vbus<Vbat and the battery pack is charged, the first DC/DC converter is configured to boost Vbus to output Vbat, wherein Vbus represents the rated voltage of the first terminal of the second DC/DC converter, and Vbat represents the rated voltage of the anode of the battery pack. 8. The energy storage system according to claim 1 , wherein the power generation system comprises an inverter, a first terminal of the inverter is connected to the first interface of the electrical energy storage system, and a second terminal of the inverter is connected to an alternating current load or an alternating current power grid. 9. The energy storage system according to claim 1 , wherein the power generation system is a photovoltaic power generation system, the power generation system comprises a photovoltaic inverter, the photovoltaic inverter comprises a maximum power point tracking (MPPT) module and a DC/AC converter, and the inverter is the DC/AC converter; and a first terminal of the DC/AC converter is connected to the first interface of the electrical energy storage system, the first terminal of the DC/AC converter is further connected to the MPPT module, and a second terminal of the DC/AC converter is connected to the alternating current load or the alternating current power grid. 10. An electrical energy storage system, comprising: two group of battery packs; two group of direct current to direct current (DC/DC) converters, each group comprising a plurality of first (DC/DC converters and second DC/DC converters, wherein first terminals of the first DC/DC converters are respectively connected to the battery packs in the same group, a first terminal of each second DC/DC converter is connected to second terminals of one first DC/DC converter in the same group, a second terminal of each second DC/DC converter are connected to each other in parallel; and wherein one of the first DC/DC converters configured to switch between a boost mode, a buck mode, and a pass-through mode according to a voltage difference between the connected battery pack voltage and a second terminal voltage of the corresponding first DC/DC converter. 11. The system according to claim 10 , wherein when Vinv−Vbus>Vth and a battery pack is discharged, the second DC/DC converter is configured to boost Vbus to output Vinv; or when Vinv−Vbus>Vth and a battery pack is charged, the second DC/DC converter is configured to buck Vinv to output Vbus, wherein Vinv represents a rated voltage of the second terminal of the second DC/DC converter, Vbus represents a rated voltage of the first terminal of the second DC/DC converter, and Vth represents a preset threshold voltage. 12. The system according to claim 10 , wherein when −Vth≤Vinv−Vbus<Vth, the second DC/DC converter works in a direct mode, wherein Vinv represents the rated voltage of the second terminal of the second DC/DC converter, Vbus represents the rated voltage of the first terminal of the second DC/DC converter, and Vth represents the preset threshold voltage. 13. The system according to claim 10 , wherein when Vinv−Vbus<−Vth and the battery pack is discharged, the second DC/DC converter is configured to buck Vbus to output Vinv; or when Vinv−Vbus>Vth and the battery pack is charged, the second DC/DC converter is configured to boost Vinv to output Vbus, wherein Vinv represents the rated voltage of the second terminal of the second DC/DC converter, Vbus represents the rated voltage of the first terminal of the second DC/DC converter, and Vth represents the preset threshold voltage. 14. The system according to claim 10 , wherein when Vbus>Vbat and the battery pack is discharged, the first DC/DC converter is configured to boost Vbat to output Vbus; or when Vbus>Vbat and the battery pack is charged, the first DC/DC converter is configured to buck Vbus to output Vbat, wherein Vbus represents the rated voltage of the first terminal of the second DC/DC converter, and Vbat represents a rated voltage of an anode of the batter
Assignees
Inventors
Classifications
Wind energy · CPC title
involving maximum power point tracking control for photovoltaic sources · CPC title
acting upon multiple batteries simultaneously or sequentially · CPC title
Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title
Active balancing, e.g. using capacitor-based, inductor-based or DC-DC converters · CPC title
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- What does patent US12212142B2 cover?
- An electrical energy storage system is provided in this disclosure, which includes: M battery packs; M first DC/DC converters, where first terminals of the M first DC/DC converters are respectively connected to the M battery packs, the M first DC/DC converters are classified into N first DC/DC converter sets; and N second DC/DC converters, where the N second DC/DC converters one-to-one correspo…
- Who is the assignee on this patent?
- Huawei Digital Power Tech Co Ltd, Huawei Tech Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H02J3/381. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 28 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).