Electrical energy storage system and energy storage system
View Patent ↗An electrical energy storage system is provided in this dislosure, 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.
1. An electrical energy storage system, comprising:
M battery packs;
M first direct current to direct current (DC/DC) converters, wherein 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, M is an integer greater than 1, and N is an integer greater than 0; and
N second DC/DC converters, wherein 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 configured to receive a direct current from a power generation system or output a direct current to the power generation system.
2. The 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 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 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 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 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 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 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 system according to claim 8 , 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 energy storage system, wherein the system comprises an electrical energy storage system and a power generation system;
wherein the electrical energy storage system comprises M battery packs;
M first direct current to direct current (DC/DC) converters, wherein 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, M is an integer greater than 1, and N is an integer greater than 0; and
N second DC/DC converters, wherein 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 configured to receive a direct current from a power generation system or output a direct current to the power generation system.
11. The energy storage 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 energy storage 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 energy storage 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 energy storage 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 battery pack.
15. The energy storage system according to claim 10 , 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.
16. The energy storage system according to claim 10 , 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.
17. The energy storage system according to claim 10 , 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.
18. The energy storage system according to claim 17 , 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.