CN-116169924-B - Direct current variable flow air conditioning system and power balance adjusting method and device

CN116169924BCN 116169924 BCN116169924 BCN 116169924BCN-116169924-B

Abstract

The invention discloses a direct current variable flow air conditioning system and a power balance adjusting method and device, wherein a direct current compression motor is adopted in the direct current air conditioning device in the direct current variable flow air conditioning system, so that the direct current variable flow air conditioning system has excellent variable speed running performance, the speed of the direct current variable flow air conditioning system is not required to be adjusted through a frequency converter, the change of the rotating speed of the motor can be conveniently realized only by voltage adjustment, the direct current variable flow air conditioning device is directly distributed by an energy storage battery pack, an external alternating current power supply is not required to be connected, the electrical system of the conventional air conditioning device is fully simplified, the equipment cost is reduced, the equipment volume is reduced, the length of an external power supply cable is also reduced, the fault risk formed by mixing of the alternating current and direct current systems in a prefabricated cabin is reduced, the influence of harmonic waves and the like caused by the direct current variable flow action of the alternating current power supply is improved, and the effects of energy conservation and consumption are achieved. Meanwhile, the energy storage battery pack is divided into at least one group of sub energy storage battery packs, and each group of sub energy storage battery packs is used for distributing power to each direct current air conditioning device, so that the overall efficiency is improved.

Inventors

HUO ZHIPENG
GAO KUN
WU ZAIQIAN
DANG JIN
WANG HAILIANG
LUO CHANGJU
NIU KELONG
WANG YUMEI
LI BIN
BIAN LI
DING XIN
ZHANG TING
ZHENG JIANBIN
REN WANDONG
JIN ZHIXIN

Assignees

中国能源建设集团山西省电力勘测设计院有限公司

Dates

Publication Date: 20260505
Application Date: 20221213

Claims (10)

1. A direct current variable flow air conditioning system, comprising: At least one dc air conditioning device, each of the dc air conditioning devices including a dc compression motor; Each energy storage battery pack comprises at least one sub energy storage battery pack, and each sub energy storage battery pack is used for outputting voltage to each direct current air conditioning device so that the direct current compression motor rotates according to the output voltage; The main controller is connected with each group of energy storage battery packs, and is used for acquiring an ambient temperature parameter, a first electrical parameter of each direct current air conditioner and a second electrical parameter of each group of energy storage battery packs, determining a first voltage adjustment value based on the first electrical parameter and the ambient temperature parameter, and sending the first voltage adjustment value and the second electrical parameter to the adjustable voltage divider, wherein the first electrical parameter comprises rated power, rated voltage, rated current and use temperature of the direct current air conditioner, and the second electrical parameter comprises battery power, voltage, battery cell internal resistance and current of the energy storage battery packs; Each adjustable voltage divider is connected in series with each energy storage battery pack, and is used for adjusting the terminal voltage of each energy storage battery pack according to the first voltage adjustment value and the second electrical parameter to obtain a first voltage value of each energy storage battery pack, so that the energy storage battery packs control the direct current air conditioning device by using the first voltage values; The method comprises the steps of determining an ambient temperature target difference value according to the ambient temperature parameter, calculating an output rotating speed target variation value of each direct current air conditioner according to the ambient temperature target difference value, determining an association relation between an induced voltage and an output rotating speed of each direct current compression motor based on the principle of the output rotating speed target variation value of each direct current air conditioner and the direct current compression motor, obtaining an output rotating speed value of each direct current compression motor, determining a voltage variation value of each direct current air conditioner according to each output rotating speed value and the association relation, determining a voltage variation value according to the voltage variation value of each direct current air conditioner, and determining the first voltage adjustment value according to the voltage variation value and the current voltage value of the direct current air conditioner.
2. The direct current variable flow air conditioning system of claim 1, wherein the main controller determining a first voltage adjustment value based on the first electrical parameter and the ambient temperature parameter comprises: The main controller determines a second voltage adjustment value of each direct current air conditioner based on a first electrical parameter of each direct current air conditioner and the environmental temperature parameter; the main controller determines the first voltage adjustment value based on a second voltage adjustment value of each of the direct current air conditioning devices.
3. The direct current variable flow air conditioning system of claim 2, wherein the system further comprises: And each direct current variable-voltage unit is respectively connected with the main controller and the direct current air conditioner, and is used for receiving the second voltage adjustment value sent by the main controller, adjusting the terminal voltage of the direct current air conditioner according to the second voltage adjustment value to obtain a second voltage value of each direct current air conditioner, and controlling the direct current air conditioner by utilizing the second voltage value.
4. The direct current variable flow air conditioning system of claim 3, wherein, The main controller is also used for receiving the first voltage value and the second voltage value and judging whether the terminal voltage of each direct current air conditioner is balanced or not according to the first voltage value and the second voltage value.
5. The direct current variable flow air conditioning system of claim 3, wherein, Each direct current variable voltage unit is also used for measuring the first electrical parameter of each direct current air conditioner and sending the first electrical parameter to the main controller.
6. The direct current variable flow air conditioning system of claim 1, further comprising: And the environment temperature sensor is used for collecting the environment temperature parameters and sending the environment temperature parameters to the main controller.
7. A power balance adjustment method for a direct current converting air conditioning system according to any of claims 1-6, the method comprising: The method comprises the steps that a main controller obtains first electrical parameters sent by at least one direct current variable-voltage unit in the direct current variable-voltage air conditioning system, second electrical parameters of each energy storage battery pack and environmental temperature parameters uploaded by an environmental temperature sensor, wherein the first electrical parameters comprise rated power, rated voltage, rated current and use temperature of the direct current air conditioning device, and the second electrical parameters comprise battery power, voltage, battery cell internal resistance and current of the energy storage battery pack; the main controller determines a second voltage adjustment value of each direct current air conditioning device in the direct current air conditioning system based on the first electrical parameter and the environmental temperature parameter, and determines a first voltage adjustment value based on the second voltage adjustment value of each direct current air conditioning device; the main controller sends the first voltage adjustment value and the second electrical parameter to the adjustable voltage divider connected in each group of energy storage battery packs, and sends the second voltage adjustment value to the direct current variable voltage unit; The adjustable voltage divider adjusts the terminal voltage of each group of energy storage battery packs according to the first voltage adjustment value and the second electrical parameter to obtain a first voltage value of each group of energy storage battery packs, and sends the first voltage value to the main controller; the direct current variable-voltage unit adjusts the terminal voltage of the direct current air conditioner according to the second voltage adjustment value to obtain a second voltage value of each direct current air conditioner, and sends the second voltage value to the main controller; The main controller judges whether terminal voltage of each direct current air conditioner is balanced or not according to the first voltage value and the second voltage value, and the terminal voltage is used for adjusting output power of the direct current air conditioner; The method comprises the steps of determining a second voltage adjustment value of each direct current air conditioning device in the direct current variable current air conditioning system based on the first electrical parameter and the environment temperature parameter, determining an environment temperature target difference value according to the environment temperature parameter, calculating an output rotating speed target variation value of each direct current air conditioning device according to the environment temperature target difference value, determining an association relation between an induction voltage and an output rotating speed of each direct current compression motor based on the output rotating speed target variation value of each direct current air conditioning device and a principle of the direct current compression motor, obtaining an output rotating speed value of each direct current compression motor, determining a voltage variation value of each direct current air conditioning device according to each output rotating speed value and the association relation, determining the voltage variation value according to the voltage variation value of each direct current air conditioning device, and determining the first voltage adjustment value according to the voltage variation value and the current voltage value of the direct current air conditioning device.
8. A power balance adjustment device for a direct current converting air conditioning system according to any of claims 1-6, characterized in that the device comprises: The acquisition module is used for acquiring first electrical parameters sent by at least one direct current variable-voltage unit in the direct current variable-voltage air conditioning system by a main controller, wherein the second electrical parameters of each energy storage battery pack and the environmental temperature parameters uploaded by an environmental temperature sensor comprise rated power, rated voltage, rated current and use temperature of the direct current air conditioning device, and the second electrical parameters comprise battery power, voltage, battery cell internal resistance and current of the energy storage battery pack; The determining module is used for determining a second voltage adjustment value of each direct current air conditioning device in the direct current variable current air conditioning system based on the first electrical parameter and the environmental temperature parameter, and determining a first voltage adjustment value based on the second voltage adjustment value of each direct current air conditioning device; the sending module is used for sending the first voltage adjustment value and the second electrical parameter to the adjustable voltage divider connected in each group of energy storage battery packs by the main controller, and sending the second voltage adjustment value to the direct current variable voltage transformation unit; The first adjusting module is used for adjusting the terminal voltage of each group of energy storage battery packs according to the first voltage adjusting value and the second electrical parameter by the adjustable voltage divider to obtain a first voltage value of each group of energy storage battery packs, and sending the first voltage value to the main controller; the second adjusting module is used for adjusting the terminal voltage of the direct current air conditioner according to the second voltage adjusting value by the direct current variable-voltage unit to obtain a second voltage value of each direct current air conditioner and sending the second voltage value to the main controller; The judging module is used for judging whether the terminal voltage of each direct current air conditioner is balanced or not according to the first voltage value and the second voltage value by the main controller, and the terminal voltage is used for adjusting the output power of the direct current air conditioner; The determining module determines a second voltage adjustment value of each direct current air conditioner in the direct current variable flow air conditioning system based on the first electrical parameter and the environment temperature parameter, wherein the determining module determines an environment temperature target difference value according to the environment temperature parameter, calculates an output rotating speed target variation value of each direct current air conditioner according to the environment temperature target difference value, determines an association relation between an induction voltage and an output rotating speed of each direct current compression motor based on the output rotating speed target variation value of each direct current air conditioner and a principle of the direct current compression motor, obtains an output rotating speed value of each direct current compression motor, determines a voltage variation value of each direct current air conditioner according to each output rotating speed value and the association relation, determines a voltage variation value according to the voltage variation value of each direct current air conditioner, and determines the first voltage adjustment value according to the voltage variation value and the current voltage value of the direct current air conditioner.
9. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, the computer instructions for causing the computer to perform the power balance adjustment method of claim 7.
10. An electronic device comprising a memory and a processor, the memory and the processor being communicatively coupled to each other, the memory storing computer instructions, the processor executing the computer instructions to perform the power balancing adjustment method of claim 7.

Description

Direct current variable flow air conditioning system and power balance adjusting method and device Technical Field The invention relates to the technical field of air conditioner power supply, in particular to a direct current variable flow air conditioner system and a power balance adjusting method and device. Background As an important support for emerging power systems, new energy storage industries, represented by electrochemical energy storage, have been actively developed, wherein electrochemical energy storage devices, particularly those installed using prefabricated cabins, are most widely used. On the basis of principle, the electrochemical energy storage device installed in the prefabricated cabin has high requirement on the environment temperature during working, so that a large-capacity air conditioning device is required to be configured to ensure safe operation of the device. In order to improve the control level and save energy, various air conditioners generally adopt an alternating current frequency conversion technology or a direct current conversion technology, and particularly the alternating current frequency conversion technology or the direct current conversion technology is composed of an alternating current power supply, an alternating current rectifying unit, an intelligent power module, a compressor, a control circuit and the like. The power regulation can be conveniently realized by regulating the direct current voltage by rectifying the alternating current into the direct current, but the external part of the power regulation still adopts alternating current power supply. From the electrical perspective, an ac-ac or ac-dc-ac frequency conversion device needs to be configured, the power distribution links are more, the system is complex, the overall efficiency is lower, the power consumption is higher, the reliability of equipment is not facilitated, the energy conservation is also not facilitated, and meanwhile, the possibility of confusing ac-dc power supply and causing safety risks exists due to the fact that an external ac power supply is introduced into a dc system. However, the conventional power system is powered by alternating current, and a direct current power supply with large capacity and high voltage level is lacking in practice, so that direct current power supply cannot be adopted, and the power distribution link is simplified. Disclosure of Invention In view of the above, the embodiment of the invention provides a direct current converting air conditioning system and a power balance adjusting method and device, which are used for solving the technical problems of more power distribution links, complex system, low overall efficiency, complex power distribution links and the like caused by the introduction of an external alternating current power supply in the prior art. The technical scheme provided by the invention is as follows: In a first aspect, an embodiment of the present invention provides a dc-to-ac air conditioning system, including at least one dc air conditioning device, each of the dc air conditioning devices including a dc compression motor, at least one set of energy storage battery packs, each of the energy storage battery packs including at least one set of sub-energy storage battery packs, each set of sub-energy storage battery packs configured to output a voltage to each of the dc air conditioning devices such that the dc compression motor rotates according to the output voltage, a main controller connected to each set of energy storage battery packs, configured to obtain an ambient temperature parameter, a first electrical parameter of each of the dc air conditioning devices, and a second electrical parameter of each of the energy storage battery packs, and to determine a first voltage adjustment value based on the first electrical parameter and the ambient temperature parameter, and to send the first voltage adjustment value and the second electrical parameter to an adjustable voltage divider, each of the adjustable voltage dividers being connected in series to each of the energy storage battery packs, and configured to control the voltage of each set of energy storage battery packs using the first voltage adjustment value and the second voltage adjustment value of each of the energy storage battery packs. With reference to the first aspect, in a possible implementation manner of the first aspect, the main controller determines a first voltage adjustment value based on the first electrical parameter and the environmental temperature parameter, including that the main controller determines a second voltage adjustment value of each of the direct current air conditioning devices based on the first electrical parameter and the environmental temperature parameter of each of the direct current air conditioning devices, and the main controller determines the first voltage adjustment value based on the second voltage adjustment value of each of the dire