CN-121984066-A - Multi-device control method and optical storage and charging system

Abstract

The application discloses a control method of multiple devices and an optical storage and filling system, and belongs to the field of optical storage and filling. The multi-device control method comprises the steps of obtaining maximum outputtable power, maximum inputtable power, surplus power and required power corresponding to each device, obtaining total surplus power corresponding to all devices in surplus state, total required power corresponding to all devices in required state, output power accumulated value of maximum outputtable power corresponding to all devices and input power accumulated value of maximum inputtable power corresponding to all devices based on the maximum outputtable power, maximum inputtable power, surplus power and required power, controlling the operation of the devices based on the input power accumulated value when the total surplus power is larger than the input power accumulated value, and controlling the operation of the devices based on the total surplus power and the total required power when the total surplus power is smaller than or equal to the input power accumulated value.

Inventors

• KE JIN
• YANG CHENG

Assignees

• 上海思格数字技术有限公司

Dates

Publication Date

20260505

Application Date

20251231

Claims (20)

1. 1. The control method of the multiple devices is characterized in that the devices are respectively connected with a power grid through a first alternating current bus, and are respectively connected with the same second direct current bus, and the method comprises the following steps: Obtaining the maximum outputtable power, the maximum inputtable power, surplus power and required power corresponding to each device; obtaining total surplus power corresponding to all devices in a surplus state, total required power corresponding to all devices in a required state, an output power accumulated value of the maximum outputtable power corresponding to all devices and an input power accumulated value of the maximum inputtable power corresponding to all devices based on the maximum outputtable power, the maximum inputtable power, the surplus power and the required power; controlling the device to operate based on the input power accumulated value when the total surplus power is greater than the input power accumulated value; And controlling the equipment to run based on the total surplus power and the total required power under the condition that the total surplus power is smaller than or equal to the input power accumulated value.
2. 2. The method of claim 1, wherein controlling the operation of the device based on the input power accumulated value comprises: controlling the equipment which does not work at the maximum photovoltaic power of the photovoltaic equipment to output power to the second direct current bus based on the accumulated value of the input power, controlling the equipment with the maximum inputtable power larger than 0 in the rest equipment to absorb power from the second direct current bus, The remaining devices are devices of the total devices except for devices where the photovoltaic device is not operating at photovoltaic maximum power.
3. 3. The method of claim 1, wherein the controlling the operation of the device based on the total surplus power and the total required power comprises: controlling the equipment to run based on the total surplus power and the total required power under the condition that the total surplus power is greater than or equal to the total required power; and controlling the equipment to operate based on the total surplus power, the total required power and the output power accumulated value under the condition that the total surplus power is smaller than the total required power.
4. 4. A control method of a plurality of devices according to claim 3, wherein the controlling the operation of the devices based on the total surplus power and the total required power in the case where the total surplus power is greater than or equal to the total required power includes: Controlling the equipment in a surplus state to output power to the second direct current bus based on the total surplus power when the total surplus power is larger than the total required power, controlling the equipment in a required state to absorb power from the second direct current bus, controlling the equipment with the maximum inputtable power larger than 0 in the rest equipment to absorb power from the second direct current bus based on the difference between the total surplus power and the total required power, The remaining devices are devices of the total devices except in the surplus state and the demand state.
5. 5. A control method of a plurality of devices according to claim 3, wherein the controlling the operation of the devices based on the total surplus power and the total required power in the case where the total surplus power is greater than or equal to the total required power includes: And controlling the equipment in the surplus state to output power to the second direct current bus based on the total surplus power under the condition that the total surplus power is equal to the total required power, and controlling the equipment in the required state to absorb power from the second direct current bus.
6. 6. A control method of a plurality of devices according to claim 3, wherein, in the case where the total surplus power is smaller than the total required power, controlling the operation of the devices based on the total surplus power, the total required power, and the output power accumulated value includes: And controlling the equipment with the maximum outputtable power larger than 0 to output power to the second direct current bus based on the total required power under the condition that the total surplus power is smaller than the total required power and the output power accumulated value is larger than or equal to the total required power, and controlling the equipment in a required state to absorb power from the second direct current bus.
7. 7. A control method of a plurality of devices according to claim 3, wherein, in the case where the total surplus power is smaller than the total required power, controlling the operation of the devices based on the total surplus power, the total required power, and the output power accumulated value includes: And controlling the equipment with the maximum outputtable power larger than 0 to output power to the second direct current bus under the condition that the total surplus power is smaller than the total required power and the accumulated value of the output power is smaller than the total required power, and controlling the equipment in a required state to absorb power from the second direct current bus.
8. 8. The method of controlling a plurality of devices according to any one of claims 4 to 7, further comprising: determining an output voltage reference value corresponding to the direct current converter based on the photovoltaic maximum power, the battery maximum discharge capacity, the battery maximum charge capacity, the load power corresponding to the equipment and a reference value of the output voltage reference value of the direct current converter correspondingly connected with the equipment, wherein the output voltage reference value is the output voltage reference value of the direct current converter relative to the second direct current bus; and controlling the operation of the equipment based on the output voltage reference value and the actual power of the equipment.
9. 9. The method of claim 8, wherein the controlling the device in the demand state to absorb power from the second dc bus comprises: Based on the sum of the photovoltaic maximum power, the battery maximum discharge capacity and the actual input power of the equipment from the second direct current bus, and the difference of the load power corresponding to the equipment, regulating the reference value of the output voltage reference value of the direct current converter correspondingly connected with the equipment to obtain the output voltage reference value corresponding to the direct current converter; And controlling the equipment to operate based on the output voltage reference value and the actual input power of the direct current converter.
10. 10. The method according to claim 8, characterized in that controlling the device in the surplus state to output power to the second dc bus or controlling the device whose maximum outputtable power is greater than 0 to output power to the second dc bus includes: Based on the photovoltaic maximum power corresponding to the equipment, regulating a reference value of an output voltage reference value of a direct current converter correspondingly connected with the equipment to obtain an output voltage reference value corresponding to the direct current converter, wherein the reference value is a difference value of the sum of the maximum battery charging capability, the actual output power of the equipment to the second direct current bus currently and the load power corresponding to the equipment; And controlling the equipment to operate based on the output voltage reference value and the actual output power of the direct current converter.
11. 11. The method of controlling a plurality of devices according to any one of claims 1 to 7, wherein acquiring the surplus power includes: Obtaining surplus power based on the difference value of the sum of the photovoltaic maximum power corresponding to the equipment, the load power corresponding to the equipment and the maximum charging capacity of the battery; and determining that the equipment is in the surplus state under the condition that the surplus power is larger than 0.
12. 12. The method of controlling a plurality of devices according to any one of claims 1 to 7, wherein obtaining the required power includes: Obtaining the required power of the equipment based on the difference value of the sum of the maximum photovoltaic power and the maximum battery discharging capacity corresponding to the equipment; and in the case that the required power is greater than 0, determining that the equipment is in a required state.
13. 13. The method of controlling a plurality of devices according to any one of claims 1 to 7, wherein obtaining the maximum outputtable power includes: Under the condition that the sum of the photovoltaic maximum power corresponding to the equipment and the battery maximum discharge capacity is larger than the load power corresponding to the equipment, determining the difference between the sum of the photovoltaic maximum power and the battery maximum discharge capacity and the load power as the maximum outputtable power; And determining the maximum outputtable power as 0 under the condition that the sum of the photovoltaic maximum power corresponding to the equipment and the battery maximum discharge capacity is smaller than or equal to the load power corresponding to the equipment.
14. 14. The method of controlling a plurality of devices according to any one of claims 1 to 7, wherein obtaining the maximum inputtable power comprises: Determining the maximum inputtable power based on the difference between the sum of the maximum battery charging capability and the load power and the maximum photovoltaic power under the condition that the sum of the maximum battery charging capability and the load power corresponding to the equipment is larger than the maximum photovoltaic power corresponding to the equipment; And determining the maximum inputtable power as 0 under the condition that the sum of the maximum battery charging capacity and the load power corresponding to the equipment is smaller than or equal to the photovoltaic maximum power corresponding to the equipment.
15. 15. The method of controlling a plurality of devices according to any one of claims 1 to 7, further comprising: determining an output voltage reference value corresponding to the direct current converter based on the photovoltaic maximum power, the battery maximum discharge capacity, the battery maximum charge capacity corresponding to the equipment, the load power corresponding to the equipment and the reference value of the output voltage reference value of the direct current converter correspondingly connected with the equipment; and controlling the operation of the equipment based on the output voltage reference value and the actual power of the equipment.
16. 16. The control device of the multiple devices is characterized in that the devices are respectively connected with a power grid through a first alternating current bus, and are respectively connected with the same second direct current bus, and the device comprises: The first processing module is used for obtaining the maximum outputtable power, the maximum inputtable power, surplus power and required power corresponding to each device; The second processing module is configured to obtain, based on the maximum outputtable power, the maximum inputtable power, the surplus power and the required power, a total surplus power corresponding to all devices in a surplus state, a total required power corresponding to all devices in a required state, an output power accumulated value of the maximum outputtable power corresponding to all devices, and an input power accumulated value of the maximum inputtable power corresponding to all devices; a third processing module, configured to control the device to operate based on the input power accumulated value when the total surplus power is greater than the input power accumulated value; And the fourth processing module is used for controlling the equipment to run based on the total surplus power and the total required power under the condition that the total surplus power is smaller than or equal to the input power accumulated value.
17. 17. An optical storage and filling system, comprising: at least one device, each device is respectively used for being connected with a power grid through a first alternating current bus, and each device is respectively connected with the same second direct current bus; Each of the devices operates based on the control method of the multi-device as claimed in any one of claims 1 to 15.
18. 18. The optical storage and retrieval system according to claim 17, further comprising: The at least one direct current converter is arranged in one-to-one correspondence with the at least one device, the direct current converters are connected with internal direct current buses of the corresponding devices, and the direct current converters are connected through the second direct current buses.
19. 19. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements a method of controlling a multi-device as claimed in any one of claims 1-15.
20. 20. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements a method of controlling a multi-device as claimed in any one of claims 1-15.

Description

Multi-device control method and optical storage and charging system Technical Field The application belongs to the field of optical storage and filling, and particularly relates to a multi-device control method and an optical storage and filling system. Background Optical storage devices typically include photovoltaic, energy storage cells, dc bus, current transformers, controllers, and the like. In the related art, in order to obtain an optical storage system with a larger capacity, a plurality of optical storage devices are often subjected to ac coupling at a grid-connected point, and power exchange can be performed between the optical storage devices of the ac parallel operation, so that cooperative control is realized. However, in the ac coupling scenario, some optical storage devices often use electricity from the power grid to support the load when the energy storage capacity is insufficient due to limited local energy storage capacity, which not only affects the equalization effect between the devices, but also increases the electricity cost on the network side. Disclosure of Invention The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a multi-device control method and an optical storage and charging system, which can ensure the power consumption requirement of the internal load of each device without taking power from a power grid, reduce the power consumption cost of the network side, and simultaneously reduce the photovoltaic light rejection rate, thereby improving the energy utilization rate and the stability of the system. In a first aspect, the present application provides a method for controlling multiple devices, where each device is respectively connected to a power grid through a first ac bus, and each device is respectively connected to a same second dc bus, and the method includes: Obtaining the maximum outputtable power, the maximum inputtable power, surplus power and required power corresponding to each device; obtaining total surplus power corresponding to all devices in a surplus state, total required power corresponding to all devices in a required state, an output power accumulated value of the maximum outputtable power corresponding to all devices and an input power accumulated value of the maximum inputtable power corresponding to all devices based on the maximum outputtable power, the maximum inputtable power, the surplus power and the required power; controlling the device to operate based on the input power accumulated value when the total surplus power is greater than the input power accumulated value; And controlling the equipment to run based on the total surplus power and the total required power under the condition that the total surplus power is smaller than or equal to the input power accumulated value. According to the multi-device control method, each device is connected to the same second direct current bus, and according to the maximum output power and the maximum input power of each device relative to the second direct current bus, the power generation capacity of the photovoltaic devices in each device and the power consumption requirement of loads are combined, the devices and the second direct current bus are controlled to perform energy interaction, the power consumption requirement of the internal loads of each device can be guaranteed without taking power from a power grid, the power consumption cost of a network side is reduced, meanwhile, the photovoltaic light rejection rate is also reduced, and therefore the energy utilization rate is improved, and the stability of the system is improved. According to one embodiment of the present application, the controlling the device to operate based on the input power accumulated value includes: controlling the equipment which does not work at the maximum photovoltaic power of the photovoltaic equipment to output power to the second direct current bus based on the accumulated value of the input power, controlling the equipment with the maximum inputtable power larger than 0 in the rest equipment to absorb power from the second direct current bus, The remaining devices are devices of the total devices except for devices where the photovoltaic device is not operating at photovoltaic maximum power. According to one embodiment of the application, the controlling the device to operate based on the total surplus power and the total required power includes: controlling the equipment to run based on the total surplus power and the total required power under the condition that the total surplus power is greater than or equal to the total required power; and controlling the equipment to operate based on the total surplus power, the total required power and the output power accumulated value under the condition that the total surplus power is smaller than the total required power. According to one embodiment of the present application, the co