US 12,434,577 B2
Energy storage system and control method thereof
Jie Zhang, Hefei (CN); Linchong Xu, Hefei (CN); Zijiao Pan, Hefei (CN); and Peng Zhang, Hefei (CN)
Assigned to Sungrow Power Supply Co., Ltd., Hefei (CN)
Filed by Sungrow Power Supply Co., Ltd., Hefei (CN)
Filed on Mar. 2, 2022, as Appl. No. 17/685,210.
Claims priority of application No. 202110306015.0 (CN), filed on Mar. 22, 2021.
Prior Publication US 2022/0297552 A1, Sep. 22, 2022
Int. Cl. H02J 7/00 (2006.01); B60L 53/10 (2019.01); B60L 53/51 (2019.01); B60L 53/53 (2019.01); B60L 53/57 (2019.01); B60L 55/00 (2019.01); H02J 3/32 (2006.01); H02J 7/34 (2006.01)
CPC B60L 53/11 (2019.02) [B60L 53/51 (2019.02); B60L 53/53 (2019.02); B60L 53/57 (2019.02); B60L 55/00 (2019.02); H02J 3/322 (2020.01); H02J 7/34 (2013.01); B60L 2210/10 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A control method for an energy storage system, applied to an energy storage system, wherein the energy storage system comprises: an energy storage battery, a first bidirectional DC/DC circuit, a DC bus, a DC/AC circuit, a first controllable switch, and a second controllable switch; the energy storage battery is connected to a device side of the first bidirectional DC/DC circuit via the first controllable switch; a bus side of the first bidirectional DC/DC circuit is connected to the DC bus; the DC bus is connected to a public power grid via the DC/AC circuit; one end of the second controllable switch is configured to connect to a chargeable vehicle, and another end of the second controllable switch is connected to the device side of the first bidirectional DC/DC circuit; and at most one of the first controllable switch and the second controllable switch is in a closed state at the same time;
wherein the method comprises:
determining whether there is a charging request sent by a chargeable object; and
controlling, in a case that the charging request exists, the energy storage system or a public power grid connected to the energy storage system to charge the chargeable object;
wherein the chargeable object is at least one of an energy storage battery in the energy storage system or a chargeable vehicle connected to the energy storage system;
wherein controlling the energy storage system or the public power grid connected to the energy storage system to charge the chargeable object comprises:
obtaining operating states of candidate power supplies in the energy storage system and the public power grid connected to the energy storage system respectively, wherein, the candidate power supplies comprise the energy storage battery, the chargeable vehicle, and a DC power supply in the energy storage system;
determining a target power supply by a preset priority order of power supply according to the operating states of the candidate power supplies and the public power grid;
determining a target power supply path between the target power supply and the chargeable object according to a path selection rule; and
controlling the target power supply path between the target power supply and the chargeable object to be turned on, for the target power supply to charge the chargeable object; and
wherein determining the target power supply path between the target power supply and the chargeable object comprises:
determining, in a case that there are a plurality of chargeable objects, a target chargeable object according to a preset order of charging priority; and
determining a target power supply path between the target power supply and the target chargeable object.