CN-115395620-B - Energy storage control method, device and energy storage system
Abstract
The invention discloses an energy storage control method, an energy storage control device and an energy storage system. The energy storage system comprises a first energy storage unit and a second energy storage unit, wherein the first energy storage unit and the second energy storage unit are both connected to a load, the second energy storage unit is a lithium ion battery, the energy storage control method comprises the steps of detecting load current in real time, determining the energy storage unit for supplying power to the load according to the load current, the upper limit value of the output current of the second energy storage unit and the change rate of the load current, and controlling the output current of the energy storage unit so that the second energy storage unit limits power output and the first energy storage unit responds to the change of the load power in real time. According to the invention, the first energy storage unit and the second energy storage unit are combined, the second energy storage unit outputs constant power according to the requirement, the first energy storage unit changes the output power to respond to the load power change in real time, the real-time response to the load power change is realized, the energy storage economy is also realized, and the two energy storage units are matched for power supply, so that the whole operation life of the energy storage system is prolonged.
Inventors
- ZENG YUNHONG
- LI WEIJIN
- NA KE
Assignees
- 国创能源互联网创新中心(广东)有限公司
- 珠海格力电器股份有限公司
Dates
- Publication Date
- 20260508
- Application Date
- 20220926
Claims (7)
- 1. The energy storage control method is characterized in that the energy storage system comprises a first energy storage unit and a second energy storage unit, wherein the first energy storage unit and the second energy storage unit are both connected to a load, the second energy storage unit is a lithium ion battery, and the energy storage control method comprises the following steps: detecting load current in real time; according to the load current, the upper limit value of the output current of the second energy storage unit and the load current change rate, determining an energy storage unit for supplying power to the load and controlling the output current of the energy storage unit, so that the second energy storage unit limits the power output and the first energy storage unit responds to the load power change in real time; determining an energy storage unit for supplying power to the load and controlling the output current of the energy storage unit according to the load current, the upper limit value of the output current of the second energy storage unit and the change rate of the load current, wherein the method comprises the following steps: if the load current is smaller than or equal to the upper limit value of the output current of the second energy storage unit, determining an energy storage unit for supplying power to the load and controlling the output current of the energy storage unit according to the load current change rate and a preset change rate, wherein the preset change rate is a current change rate bearable by the second energy storage unit; Determining an energy storage unit for supplying power to the load and controlling the output current of the energy storage unit according to the load current change rate and a preset change rate, wherein the method comprises the following steps: Detecting the change rate of load current within a preset time; if the load current change rate is smaller than the preset change rate, determining that the second energy storage unit supplies power to the load, and controlling the output current of the second energy storage unit to be constant as the load current; And if the change rate of the load current is greater than or equal to the preset change rate, determining that the first energy storage unit and the second energy storage unit supply power to the load together, controlling the output current of the second energy storage unit to be constant as a first current, and controlling the output current of the first energy storage unit to be the load current minus the first current, wherein the first current is smaller than or equal to the upper limit value of the output current of the second energy storage unit.
- 2. The method of claim 1, wherein determining an energy storage unit that supplies power to the load and controlling an output current of the energy storage unit based on the load current, an upper limit value of the output current of the second energy storage unit, and a load current change rate, comprises: And if the load current is larger than the output current upper limit value of the second energy storage unit, determining that the first energy storage unit and the second energy storage unit supply power to the load together, controlling the output current of the second energy storage unit to be constant to be the output current upper limit value, and controlling the output current of the first energy storage unit to be the load current minus the output current upper limit value.
- 3. The method according to any one of claims 1 to 2, wherein the first energy storage unit is a lithium titanate battery.
- 4. The energy storage control device is applied to an energy storage system and is characterized by comprising a first energy storage unit and a second energy storage unit, wherein the first energy storage unit and the second energy storage unit are connected to a load, the second energy storage unit is a lithium ion battery, and the energy storage control device comprises: The detection module is used for detecting the load current in real time; the control module is used for determining an energy storage unit for supplying power to the load according to the load current, the upper limit value of the output current of the second energy storage unit and the change rate of the load current and controlling the output current of the energy storage unit so that the second energy storage unit limits the power output and the first energy storage unit responds to the load power change in real time; The control module comprises a first control unit, a second control unit and a third control unit, wherein the first control unit is used for determining an energy storage unit for supplying power to the load and controlling the output current of the energy storage unit according to the change rate of the load current and a preset change rate if the load current is smaller than or equal to the upper limit value of the output current of the second energy storage unit, and the preset change rate is the current change rate bearable by the second energy storage unit; The first control unit is specifically configured to: Detecting the change rate of load current within a preset time; if the load current change rate is smaller than the preset change rate, determining that the second energy storage unit supplies power to the load, and controlling the output current of the second energy storage unit to be constant as the load current; And if the change rate of the load current is greater than or equal to the preset change rate, determining that the first energy storage unit and the second energy storage unit supply power to the load together, controlling the output current of the second energy storage unit to be constant as a first current, and controlling the output current of the first energy storage unit to be the load current minus the first current, wherein the first current is smaller than or equal to the upper limit value of the output current of the second energy storage unit.
- 5. The energy storage system is characterized by comprising a first energy storage unit and a second energy storage unit, wherein the first energy storage unit is connected to a load through a first current transformation unit, the second energy storage unit is connected to the load through a second current transformation unit, and the first current transformation unit and the second current transformation unit are in communication connection; the first or second current transforming unit comprises the energy storage control device of claim 4.
- 6. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 3 when the computer program is executed.
- 7. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any one of claims 1 to 3.
Description
Energy storage control method, device and energy storage system Technical Field The invention relates to the technical field of energy storage, in particular to an energy storage control method, an energy storage control device and an energy storage system. Background The common lithium ion battery has price advantage, but the charge-discharge multiplying power and the cycle life are relatively short. The lithium ion battery is charged and discharged frequently or with a large rate, which affects the service life of the battery. Aiming at the problem that the service life of the lithium ion battery is influenced by frequent charge and discharge or high-rate charge and discharge in the prior art, no effective solution is proposed at present. Disclosure of Invention The embodiment of the invention provides an energy storage control method, an energy storage control device and an energy storage system, which are used for at least solving the problem that the service life of a lithium ion battery is influenced by frequent charge and discharge or high-rate charge and discharge in the prior art. In order to solve the technical problems, the embodiment of the invention provides an energy storage control method, wherein an energy storage system comprises a first energy storage unit and a second energy storage unit, the first energy storage unit and the second energy storage unit are both connected to a load, the second energy storage unit is a lithium ion battery, and the energy storage control method comprises the following steps: detecting load current in real time; And determining an energy storage unit for supplying power to the load and controlling the output current of the energy storage unit according to the load current, the upper limit value of the output current of the second energy storage unit and the change rate of the load current, so that the second energy storage unit limits the power output and the first energy storage unit responds to the load power change in real time. Optionally, determining an energy storage unit for supplying power to the load and controlling the output current of the energy storage unit according to the load current, the output current upper limit value of the second energy storage unit and the load current change rate, including: And if the load current is smaller than or equal to the upper limit value of the output current of the second energy storage unit, determining an energy storage unit for supplying power to the load according to the load current change rate and the preset change rate, and controlling the output current of the energy storage unit. Optionally, determining an energy storage unit for supplying power to the load and controlling an output current of the energy storage unit according to the load current change rate and a preset change rate, including: Detecting the change rate of load current within a preset time; if the load current change rate is smaller than the preset change rate, determining that the second energy storage unit supplies power to the load, and controlling the output current of the second energy storage unit to be constant as the load current; And if the change rate of the load current is greater than or equal to the preset change rate, determining that the first energy storage unit and the second energy storage unit supply power to the load together, controlling the output current of the second energy storage unit to be constant as a first current, and controlling the output current of the first energy storage unit to be the load current minus the first current, wherein the first current is smaller than or equal to the upper limit value of the output current of the second energy storage unit. Optionally, determining an energy storage unit for supplying power to the load and controlling the output current of the energy storage unit according to the load current, the output current upper limit value of the second energy storage unit and the load current change rate, including: And if the load current is larger than the output current upper limit value of the second energy storage unit, determining that the first energy storage unit and the second energy storage unit supply power to the load together, controlling the output current of the second energy storage unit to be constant to be the output current upper limit value, and controlling the output current of the first energy storage unit to be the load current minus the output current upper limit value. Optionally, the first energy storage unit is a lithium titanate battery. The embodiment of the invention also provides an energy storage control device which is applied to an energy storage system, wherein the energy storage system comprises a first energy storage unit and a second energy storage unit, the first energy storage unit and the second energy storage unit are both connected to a load, the second energy storage unit is a lithium ion battery, and the energy storage control device