A direct-current variable-flow air conditioning system and power balance regulation method and device

Abstract

The application discloses a kind of direct current variable flow air conditioning system and power balance regulation method, device, direct current air conditioning device in direct current variable flow air conditioning system adopts direct current compression motor, with superior variable speed operation performance, need not be speeded up by frequency converter, only voltage regulation can be conveniently realized motor speed variation;Direct current air conditioning device is directly powered by energy storage battery pack, without accessing external ac power supply, fully simplify the electrical system of conventional air conditioning device, reduce equipment cost, reduce equipment volume, also can reduce the length of external power cable, reduce the risk of failure formed due to the mixing of ac and dc system in prefabricated warehouse, improve the influence of harmonic generated by the dc conversion effect of ac power supply, play the role of energy saving and consumption reduction. At the same time, the energy storage battery pack is divided into at least one group of sub-energy storage battery pack, and each direct current air conditioning device is powered by each group of sub-energy storage battery pack, which improves the overall efficiency.

Description

Technical Field

[0001] This invention relates to the field of air conditioning power supply technology, specifically to a DC converter air conditioning system and a power balancing regulation method and device. Background Technology

[0002] As a crucial support for emerging power systems, the new energy storage industry, represented by electrochemical energy storage, is booming, with prefabricated electrochemical energy storage devices being the most widely used. However, due to their operating principle, prefabricated electrochemical energy storage devices require relatively high ambient temperatures, necessitating the installation of large-capacity air conditioning units to ensure their safe operation.

[0003] To improve control and save energy, various air conditioners have long employed AC inverter technology or DC converter technology, especially the latter, which consists of an AC power supply, an AC rectifier unit, an intelligent power module, a compressor, and control circuits. It converts AC power to DC power, allowing for easy power regulation by adjusting the DC voltage; however, it still relies on an external AC power supply. From an electrical perspective, this requires AC-AC or AC-DC-AC inverters, resulting in numerous power distribution links, system complexity, lower overall efficiency, and higher power consumption. This hinders equipment reliability and energy conservation. Furthermore, the introduction of an external AC power supply into the DC system poses a potential safety risk by blurring the lines between AC and DC power supplies. However, since conventional power systems are AC-powered, and high-capacity, high-voltage DC power supplies are lacking in practice, DC power supply cannot be used to simplify the power distribution process. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a DC converter air conditioning system and a power balancing regulation method and apparatus to solve the technical problems in the prior art, such as the introduction of external AC power supply, numerous power distribution links, system complexity and low overall efficiency, and complex power distribution links.

[0005] The technical solution proposed in this invention is as follows:

[0006] In a first aspect, embodiments of the present invention provide a DC-DC converter air conditioning system, comprising: at least one DC air conditioning device, each of the DC air conditioning devices including a DC compressor motor; at least one set of energy storage battery packs, each set of energy storage battery packs including at least one set of sub-energy storage battery packs, each set of sub-energy storage battery packs being used to output voltage to each of the DC air conditioning devices, causing the DC compressor motor to rotate according to the output voltage; a main controller, connected to each set of energy storage battery packs, for acquiring ambient temperature parameters, a first electrical parameter of each of the DC air conditioning devices, and a second electrical parameter of each set of energy storage battery packs, and 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 an adjustable voltage divider; at least one adjustable voltage divider, each of the adjustable voltage dividers being connected in series to each set of energy storage battery packs, for adjusting the terminal voltage of each set 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 set of energy storage battery packs, such that the energy storage battery packs control the DC air conditioning devices using the first voltage value.

[0007] In conjunction with the first aspect, in one possible implementation of the first aspect, the main controller determines a first voltage adjustment value based on the first electrical parameter and the ambient temperature parameter, including: the main controller determines a second voltage adjustment value for each DC air conditioning device based on the first electrical parameter and the ambient temperature parameter for each DC air conditioning device; and the main controller determines the first voltage adjustment value based on the second voltage adjustment value for each DC air conditioning device.

[0008] In conjunction with the first aspect, in another possible implementation of the first aspect, the system further includes: at least one DC-DC converter unit, each of the DC-DC converter units being connected to the main controller and the DC air conditioning device respectively, for receiving the second voltage adjustment value sent by the main controller, adjusting the terminal voltage of the DC air conditioning device according to the second voltage adjustment value to obtain a second voltage value for each DC air conditioning device, and controlling the DC air conditioning device using the second voltage value.

[0009] In conjunction with the first aspect, in another possible implementation of the first aspect, the main controller is further configured to receive the first voltage value and the second voltage value, and to determine whether the terminal voltage of each of the DC air conditioning devices is balanced based on the first voltage value and the second voltage value.

[0010] In conjunction with the first aspect, in another possible implementation of the first aspect, each of the DC converter transformer units is further configured to measure the first electrical parameter of each of the DC air conditioning units, and to send the first electrical parameter to the main controller.

[0011] In conjunction with the first aspect, in another possible implementation of the first aspect, the system further includes: an ambient temperature sensor for collecting the ambient temperature parameters and sending the ambient temperature parameters to the main controller.

[0012] Secondly, embodiments of the present invention provide a power balancing adjustment method for a DC converter air conditioning system as described in the first aspect and any one of the first aspects of the present invention; the power balancing adjustment method includes: a main controller acquiring first electrical parameters sent by at least one DC converter transformer unit in the DC converter air conditioning system, second electrical parameters of each group of energy storage battery packs, and ambient temperature parameters uploaded by an ambient temperature sensor; the main controller determining a second voltage adjustment value for each DC air conditioning device in the DC converter air conditioning system based on the first electrical parameters and the ambient temperature parameters, and determining a first voltage adjustment value based on the second voltage adjustment value of each DC air conditioning device; the main controller sending the first voltage adjustment value and the second electrical parameters to each group of energy storage battery packs. The adjustable voltage divider connected in the battery pack sends the second voltage adjustment value to the DC-DC converter 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 parameters to obtain a first voltage value for each group of energy storage battery packs, and sends the first voltage value to the main controller; the DC-DC converter unit adjusts the terminal voltage of the DC air conditioning device according to the second voltage adjustment value to obtain a second voltage value for each DC air conditioning device, and sends the second voltage value to the main controller; the main controller determines whether the terminal voltage of each DC air conditioning device is balanced according to the first voltage value and the second voltage value, and the terminal voltage is used to adjust the output power of the DC air conditioning device.

[0013] Thirdly, embodiments of the present invention provide a power balancing adjustment device for use in a DC converter air conditioning system as described in the first aspect and any one of the first aspects of the present invention; the power balancing adjustment device includes: an acquisition module, configured to acquire first electrical parameters sent by at least one DC converter transformer unit in the DC converter air conditioning system, second electrical parameters of each group of energy storage battery packs, and ambient temperature parameters uploaded by an ambient temperature sensor; a determination module, configured to determine a second voltage adjustment value for each DC air conditioning device in the DC converter air conditioning system based on the first electrical parameters and the ambient temperature parameters, and determine a first voltage adjustment value based on the second voltage adjustment value of each DC air conditioning device; and a transmission module, configured to send the first voltage adjustment value and the second electrical parameters to each group of energy storage battery packs. The adjustable voltage divider connected in the middle, and the second voltage adjustment value sent to the DC converter transformer unit; a first adjustment module, used for the adjustable voltage divider to adjust the terminal voltage of each group of energy storage battery packs according to the first voltage adjustment value and the second electrical parameters, to obtain a first voltage value of each group of energy storage battery packs, and to send the first voltage value to the main controller; a second adjustment module, used for the DC converter transformer unit to adjust the terminal voltage of the DC air conditioning device according to the second voltage adjustment value, to obtain a second voltage value of each DC air conditioning device, and to send the second voltage value to the main controller; a judgment module, used for the main controller to judge whether the terminal voltage of each DC air conditioning device is balanced according to the first voltage value and the second voltage value, the terminal voltage being used to adjust the output power of the DC air conditioning device.

[0014] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer instructions for causing the computer to perform the power equalization adjustment method as described in the second aspect of the present invention.

[0015] Fifthly, embodiments of the present invention provide an electronic device, including: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the power equalization adjustment method as described in the second aspect of the present invention.

[0016] The technical solution provided by this invention has the following effects:

[0017] The DC converter air conditioning system provided in this invention uses a DC compressor motor for the DC air conditioning unit, which has superior variable speed operation performance. It eliminates the need for speed regulation via a frequency converter; voltage adjustment is sufficient to easily change the motor speed. The system directly powers the DC air conditioning unit using an energy storage battery pack, eliminating the need for an external AC power source. This significantly simplifies the electrical system of conventional air conditioning units, reduces equipment costs and size, and also reduces the length of external power cables. This lowers the risk of faults caused by the mixing of AC and DC systems within the prefabricated silo, and mitigates the harmonic effects generated by the DC converter on the AC power supply, thus achieving energy conservation and consumption reduction. Furthermore, dividing the energy storage battery pack into at least one sub-energy storage battery pack, with each sub-energy storage battery pack powering each DC air conditioning unit, improves overall efficiency.

[0018] The power balancing adjustment method provided in this invention involves a main controller determining the voltage adjustment value for each DC air conditioner and the overall voltage adjustment value of the DC converter air conditioning system using current ambient temperature parameters and electrical parameters of the DC air conditioner. Further, adjustments are made using adjustable voltage dividers and DC converter transformer units. Finally, the main controller determines whether the output power of each DC air conditioner is balanced based on the adjustment results. Therefore, by implementing this invention, power balancing adjustment of the DC air conditioning system can be achieved through adjustment using adjustable voltage dividers and DC converter transformer units. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is an electrical schematic diagram of a conventional AC inverter (converter) air conditioner provided according to an embodiment of the present invention;

[0021] Figure 2 This is a structural block diagram of a DC converter air conditioning system according to an embodiment of the present invention;

[0022] Figure 3 This is another structural block diagram of a DC converter air conditioning system provided according to an embodiment of the present invention;

[0023] Figure 4 This is a flowchart of a power equalization adjustment method provided by an embodiment of the present invention;

[0024] Figure 5 This is a structural block diagram of a power equalization adjustment device provided according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of a computer-readable storage medium provided according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Currently, most air conditioners use either AC inverter technology or DC inverter technology (actually DC converter technology), especially the latter, which consists of an AC power supply, an AC rectifier unit, an intelligent power module (IPM), a compressor, and control circuitry, such as... Figure 1 As shown, by rectifying AC power into DC power, power regulation can be easily achieved by adjusting the DC voltage, but the external power supply still uses AC power.

[0029] Currently, prefabricated electrochemical energy storage devices typically have large single-tank capacities, generally in the MW range, and the DC bus voltage level of the energy storage battery outlet is also high, generally above 800V. Therefore, they naturally possess a large-capacity, high-voltage DC power supply. Simultaneously, these energy storage systems require a large capacity of air conditioning units to maintain temperature (for example, a single tank of 2500kW / 5000kWh lithium iron phosphate energy storage requires a total air conditioning capacity of approximately 50kW), and a large number of units are needed. Furthermore, they require external AC power supply, creating a potential need for on-site DC power supply.

[0030] Therefore, embodiments of the present invention provide a DC converter air conditioning system, such as Figure 2 As shown, the DC converter air conditioning system 100 includes:

[0031] The system includes a DC air conditioning unit 11, an energy storage battery pack 12, a main controller 13, an adjustable voltage divider 14, a DC converter transformer unit 15, and an ambient temperature sensor 16. One end of the DC converter transformer unit 15 is connected to the DC air conditioning unit 11, and the other end is connected to the energy storage battery pack 12. The adjustable voltage divider 14 is connected in series with the energy storage battery pack 12. The main controller 13 is connected to the energy storage battery pack 12, the DC converter transformer unit 15, and the ambient temperature sensor 16 via a bus.

[0032] It should be noted that the number of the aforementioned DC air conditioning device 11, energy storage battery pack 12, and DC converter transformer unit 15 can be one or more, and this embodiment does not limit this.

[0033] It should be understood that the system may also include other devices and equipment.

[0034] The DC air conditioning device 11 includes a DC compressor motor 111; in this embodiment of the invention, the DC air conditioning device 11 uses a DC 220V voltage; the energy storage battery pack 12 includes a sub-energy storage battery pack 121, which is connected to the DC air conditioning device 11; and the number of the DC compressor motor 111 and the sub-energy storage battery pack 121 can be one or more, which is not limited in this embodiment.

[0035] Specifically, compared to traditional AC motors, DC compressor motors 111 have superior variable speed operation performance. The motor speed can be easily changed by voltage adjustment, without the need for speed regulation through frequency converters. It has a wide speed regulation range and can be steplessly smooth, resulting in significant energy-saving effects. It requires fewer devices and has controllable costs.

[0036] Furthermore, the function of each device in the above system will be explained.

[0037] The sub-energy storage battery pack 121 is used to supply power to the DC air conditioning unit 11.

[0038] Specifically, the terminal voltage of the sub-energy storage battery pack 121, i.e. the output voltage, can be determined based on the terminal voltage of the energy storage battery pack 12. Furthermore, the sub-energy storage battery pack 121 outputs voltage to the DC air conditioning device 11, causing the DC air conditioning device 11 to drive the DC compressor motor 111 inside it to rotate.

[0039] The main controller 13, through connection with the ambient temperature sensor 16, can obtain the ambient temperature parameters reported by the ambient temperature sensor 16.

[0040] Furthermore, the main controller 13, by connecting to the energy storage battery pack 12 and the DC air conditioning device 11, can obtain the first electrical parameters of the DC air conditioning device 11 and the second electrical parameters of the energy storage battery pack 12.

[0041] The first electrical parameters may include the rated power, rated voltage, rated current, and operating temperature of the DC air conditioning unit 11;

[0042] Similarly, the second electrical parameters may include the battery power, voltage, battery cell internal resistance, current, etc. of the energy storage battery pack 12;

[0043] After the main controller 13 obtains the above-mentioned ambient temperature parameter, the first electrical parameter, and the second electrical parameter, the main controller 13 can calculate the overall voltage adjustment value of the DC air-conditioning device 11, that is, the first voltage adjustment value, by using the ambient temperature parameter and the first electrical parameter. Among them, the first voltage adjustment value represents the voltage value that the overall DC air-conditioning device needs to adjust. For example, if the current overall voltage value of the DC air-conditioning device is A, and the main controller 13 calculates that A needs to be adjusted to B, then the first voltage adjustment value is |B - A| at this time.

[0044] Among them, if B < A, then the current overall voltage value of the DC air-conditioning device is adjusted to decrease by |B - A|; if B > A, then the current overall voltage value of the DC air-conditioning device is adjusted to increase by |B - A|.

[0045] Specifically, the main controller 13 can first determine the ambient temperature target difference according to the ambient temperature parameter, and then, according to the ambient temperature target difference, can calculate the target change value ΔN of the output speed of each DC air-conditioning device 11 j , i = 1…, Further, according to the principle of the DC electric compressor, the relationship between the induced voltage and the output speed of the DC electric compressor 111 can be obtained.

[0046] Among them, the ambient temperature target difference represents the difference between the current temperature corresponding to the ambient temperature parameter and the temperature that the DC air-conditioning device 11 needs to provide. The temperature that the DC air-conditioning device 11 needs to provide can be determined according to the actual situation of the user.

[0047] The relationship between the induced voltage and the output speed is shown in the following relational expression (1):

[0048] E a =C e n φ (1)

[0049] In the formula: E a represents the armature induced electromotive force, that is, the induced voltage; C e represents the motor electromotive force constant; n represents the output speed; φ represents the air-gap magnetic flux.

[0050] Among them, the induced voltage of the DC electric compressor 111 is the voltage value of the DC air-conditioning device 11;

[0051] First, substitute each output speed value N j , i = 1… into the above relational expression (1) to obtain different voltage values corresponding to the DC air-conditioning device 11; secondly, according to the different voltage values, the voltage change value of the DC air-conditioning device 11 can be determined; finally, according to the voltage change value and the current voltage value of the DC air-conditioning device 11, the first voltage adjustment value of the DC air-conditioning device 11 can be determined.

[0052] Furthermore, the main controller 13 sends the first voltage adjustment value and the second electrical parameter to the adjustable voltage divider 14.

[0053] By connecting the adjustable voltage divider 14 in series with the energy storage battery pack 12, the terminal voltage of the energy storage battery pack 12 can be adjusted through the adjustable voltage divider 14.

[0054] Specifically, the adjustable voltage divider 14 adjusts the terminal voltage of the energy storage battery pack 12 according to the first voltage adjustment value and the second electrical parameters to obtain the first voltage value of the energy storage battery pack 12. Further, the adjustable voltage divider 14 sends a first control signal to the energy storage battery pack 12, and under the control of this first control signal, the energy storage battery pack 12 outputs the first voltage value, such as... Figure 2 As shown, the first voltage value is output to the DC converter transformer unit 15. After receiving the first voltage value, the DC converter transformer unit 12 sends the first voltage value to the DC air conditioning device 11, so that the DC air conditioning device 11 drives the DC compressor motor 111 inside it to rotate.

[0055] The DC converter air conditioning system provided in this invention uses a DC compressor motor in the DC air conditioning unit, which has superior variable speed operation performance. It eliminates the need for speed regulation via a frequency converter; voltage adjustment is sufficient to easily change the motor speed. The system directly powers the DC air conditioning unit using an energy storage battery pack, eliminating the need for an external AC power source. This significantly simplifies the electrical system of conventional air conditioning units, reduces equipment costs and size, and also reduces the length of external power cables. This lowers the risk of faults caused by the mixing of AC and DC systems within the prefabricated silo, and mitigates the harmonic effects of DC converter operation on the AC power supply, resulting in energy savings and reduced consumption. Furthermore, the energy storage battery pack is divided into at least one sub-energy storage battery pack, with each sub-pack powering each DC air conditioning unit, improving overall efficiency. Finally, the main controller uses an adjustable voltage divider to adjust the voltage of each sub-energy storage battery pack based on the current ambient temperature, thereby regulating the voltage of the DC air conditioning unit and ensuring balanced output power.

[0056] As an optional implementation of the present invention, when the main controller 13 determines the first voltage adjustment value based on the first electrical parameters and the ambient temperature parameters, it first determines the second voltage adjustment value of each DC air conditioning device 11 based on the first electrical parameters and the ambient temperature parameters of each DC air conditioning device 11; and secondly, it determines the first voltage adjustment value based on the second voltage adjustment value of each DC air conditioning device 11.

[0057] Specifically, the relationship between the first voltage adjustment value and the second voltage adjustment value is shown in the following equation (2):

[0058]

[0059] In the formula: ΔU k Indicates the first voltage adjustment value; ΔU j This represents the second voltage adjustment value for each DC air conditioning unit 11.

[0060] Similarly, the determination of the second voltage adjustment value for each DC air conditioning unit 11 refers to the process of determining the first voltage adjustment value described above, and will not be repeated here.

[0061] As an optional implementation of the present invention, by connecting each DC converter transformer unit 15 to the main controller 13 and the DC air conditioning device 11 respectively, the terminal voltage of the DC air conditioning device 11 can be adjusted more precisely.

[0062] Specifically, the DC converter transformer unit 15 receives a first control signal and a second voltage adjustment value sent by the main controller 13. Under the control of the first control signal, the DC converter transformer unit 15 adjusts the terminal voltage of each DC air conditioning unit 11 according to the second voltage adjustment value to obtain the adjusted terminal voltage of each DC air conditioning unit 11, i.e., the second voltage value. Finally, the DC air conditioning unit 11 drives the DC compressor motor 111 inside it to rotate under the input of the second voltage value. Among them, according to the relationship between voltage and speed (relationship (1)), the speed of the corresponding DC air conditioning unit 11, i.e., the speed of the DC compressor motor 111, can be determined according to the second voltage value, and then the DC compressor motor 111 can be used to control the DC air conditioning unit 11.

[0063] The DC-DC converter transformer unit 15 is equipped with a microcontroller and an adjustable resistor, which can be used to adjust the terminal voltage.

[0064] As an optional implementation of the present invention, the main controller 13 is further configured to receive a first voltage value and a second voltage value, and to determine whether the terminal voltage of each DC air conditioning device 11 is balanced based on the first voltage value and the second voltage value.

[0065] Specifically, each DC air conditioning unit 11 is connected to each sub-energy storage battery pack 121 through each DC converter transformer unit 11, that is, the second voltage value of each DC air conditioning unit 11 is the voltage value of each sub-energy storage battery pack 121.

[0066] Furthermore, each energy storage battery pack 12 includes at least one sub-energy storage battery pack 121, and the relationship between the voltage value of each energy storage battery pack 12 and the voltage value of the sub-energy storage battery pack 121 is shown in the following equation (3):

[0067]

[0068] In the formula: U cThis represents the terminal voltage of each energy storage battery pack 12; U k Indicates the voltage division value of the adjustable voltage divider; U j This indicates the voltage value of each sub-energy storage battery pack 121.

[0069] Therefore, when the sum of the second voltage values ​​of each DC air conditioning unit 11 is equal to the terminal voltage of each group of energy storage battery packs 12, it can be determined that the terminal voltage of each DC air conditioning unit 11 is equal to the terminal voltage of each group of sub-energy storage battery packs 121, that is, balance is achieved, and the circulating current problem caused by coupling multiple DC loads in a series DC system is avoided.

[0070] As an optional implementation of the present invention, the DC converter transformer unit 15 can be used to measure the first electrical parameter of each DC air conditioning device 11 and send the first electrical parameter to the main controller 13.

[0071] The DC inverter air conditioning system 1 provided by the present invention can automatically adjust the voltage and current of the DC air conditioner according to the changes in ambient temperature, smoothly complete the change of output power, and effectively reduce energy consumption.

[0072] In one example, a DC converter air conditioning system, such as Figure 3 As shown, the intelligent converter unit is a DC converter transformer unit, and the operating mode of this DC converter air conditioning system is as follows:

[0073] (1) Select one or more sets of energy storage battery packs for self-powering the prefabricated compartment of the energy storage system, according to the air conditioning load requirements.

[0074] (2) Based on the voltage of the energy storage battery pack (generally DC 800-1200V or above) and the voltage of the DC air conditioning device (generally DC 220V), several groups are made in a single energy storage battery pack. The voltage level of each group is consistent with the voltage required by the DC air conditioning device, and an adjustable DC voltage divider is connected in series in the battery pack.

[0075] (3) Each DC air conditioning unit is equipped with an intelligent converter unit, which can realize the measurement of electrical parameters of a single air conditioning unit and smoothly adjust the output power of the DC air conditioner in real time and steplessly according to the instructions of the main controller.

[0076] (4) The main controller collects ambient temperature information, energy storage battery pack and electrical parameters of each air conditioning unit through bus communication. It realizes the overall regulation and fine adjustment of the output power of each air conditioning unit through each speed control unit and adjustable DC voltage divider, while ensuring the balance of voltage of each group and avoiding the generation of DC circulating current.

[0077] This invention provides a power equalization regulation method for a DC converter air conditioning system 1 as provided in this invention embodiment; Figure 4 As shown, the method includes the following steps:

[0078] Step 201: The main controller acquires the first electrical parameters sent by at least one DC converter transformer unit in the DC converter air conditioning system, the second electrical parameters of each group of energy storage battery packs, and the ambient temperature parameters uploaded by the ambient temperature sensor.

[0079] Specifically, the ambient temperature parameters are collected by the ambient temperature sensor 16 in the DC converter air conditioning system 1 and sent to the main controller 13;

[0080] In the DC converter air conditioning system 1, the DC converter transformer unit 15 adopts the first electrical parameters of each DC air conditioning device and sends them to the main controller 13;

[0081] The main controller 13 communicates with the energy storage battery pack via a bus and can directly obtain the second electrical parameters of each energy storage battery pack.

[0082] Step 202: The main controller determines the second voltage adjustment value of each DC air conditioning unit in the DC converter air conditioning system based on the first electrical parameters and the ambient temperature parameters, and determines the first voltage adjustment value based on the second voltage adjustment value of each DC air conditioning unit.

[0083] The specific calculation and determination process is the same as the specific implementation process of determining the first voltage adjustment value using the main controller 13 in the DC converter air conditioning system 1 mentioned above, and will not be repeated here.

[0084] Step 203: The main controller sends the first voltage adjustment value and the second electrical parameter to the adjustable voltage divider connected in each of the energy storage battery packs, and sends the second voltage adjustment value to the DC-DC converter unit.

[0085] In the DC converter air conditioning system 1, the main controller 13 is connected to the energy storage battery pack 12 and the DC converter transformer unit 15 respectively, and the adjustable voltage divider is connected in series in the energy storage battery pack 12. Therefore, the main controller can send the first voltage adjustment value and the second electrical parameter to the adjustable voltage divider 14, and send the second voltage adjustment value to the DC converter transformer unit 15.

[0086] Step 204: 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 the first voltage value of each group of energy storage battery packs, and sends the first voltage value to the main controller.

[0087] For the specific implementation process, please refer to the functional description of the adjustable voltage divider 14 in the DC converter air conditioning system 1 mentioned above, which will not be repeated here.

[0088] Step 205: The DC converter transformer unit adjusts the terminal voltage of the DC air conditioner according to the second voltage adjustment value to obtain the second voltage value of each DC air conditioner, and sends the second voltage value to the main controller.

[0089] For the specific implementation process, please refer to the functional description of the DC converter transformer unit 15 in the DC converter air conditioning system 1 mentioned above, which will not be repeated here.

[0090] Step 206: The main controller determines whether the terminal voltage of each DC air conditioning device is balanced based on the first voltage value and the second voltage value. The terminal voltage is used to adjust the output power of the DC air conditioning device.

[0091] For the specific judgment process, please refer to the functional description of the main controller 13 in the DC converter air conditioning system 1 mentioned above, which will not be repeated here.

[0092] The power balancing adjustment method provided in this invention involves a main controller determining the voltage adjustment value for each DC air conditioner and the overall voltage adjustment value of the DC converter air conditioning system using current ambient temperature parameters and electrical parameters of the DC air conditioner. Further, adjustments are made using adjustable voltage dividers and DC converter transformer units. Finally, the main controller determines whether the output power of each DC air conditioner is balanced based on the adjustment results. Therefore, by implementing this invention, power balancing adjustment of the DC air conditioning system can be achieved through adjustment using adjustable voltage dividers and DC converter transformer units.

[0093] In one embodiment, a method for equalizing power regulation is provided, for example... Figure 3 The DC converter air conditioning system shown includes the following specific features:

[0094] (1) Let the terminal voltage of the energy storage battery pack be Uc, the voltage of the adjustable voltage divider be Uk, and the voltages of each energy storage battery pack be U1 to Un respectively. At this time, according to the DC circuit voltage formula, the relationship is shown in equation (3).

[0095] (2) For DC motors, according to their principle, their induced voltage is proportional to their speed, as shown in equation (1). It can be seen that by adjusting the DC motor voltage, the motor speed can be controlled, thereby achieving variable power output operation.

[0096] (3) The main controller monitors the ambient temperature in real time using an ambient temperature sensor to determine the target difference in ambient temperature. Through calculation, it determines the target variation value ΔN of the output speed of each air conditioning unit. j ,=1…;and then determine the corresponding DC motor voltage adjustment variation value ΔU j =1…. At this point, the target voltage adjustment value ΔU of the adjustable voltage divider can be determined. kAs shown in equation (2). Generally, under balanced air conditioning load conditions, the voltage adjustment of each DC motor should also be balanced, even if ΔU j This is set to a fixed value to ensure that the terminal voltage of each battery group and the current shunt to the air conditioning load are consistent, thereby avoiding circulating current; or, in the case of unbalanced air conditioning load, to ensure that the ratio of the terminal voltage of each air conditioning load and its corresponding battery group is constant, i.e., Z. j / U j Yes, it is certain, and it can also achieve the same effect of diverting traffic and ensuring consistency. Among them, Z j This indicates the air conditioning load.

[0097] (4) Based on the calculation results, the main controller remotely adjusts the resistor of the adjustable voltage divider through communication, thereby adjusting its voltage division and realizing the overall adjustment (coarse adjustment) of the battery pack group voltage.

[0098] (5) At the same time, the main controller sends the adjustment target values ​​to the intelligent converter units of each air conditioning unit according to the voltage adjustment change value. The intelligent converter unit is equipped with an intelligent converter unit consisting of a microcontroller and an adjustable resistor. Its adjustment is also achieved by controlling and adjusting the terminal voltage, but this adjustment is based on the voltage setpoint of this unit and is a fine adjustment.

[0099] (6) The adjustment results of the adjustable voltage divider and each intelligent converter unit are fed back to the main controller in real time through the parameter acquisition of each voltage divider device. The main controller recalculates according to the feedback results and judges whether the adjustment has achieved the effect according to the temperature feedback. If the effect is not achieved or the adjustment of each unit is deviated, the above processes (3)-(6) are repeated to realize the positive feedback process from the temperature control target to the speed of each DC motor.

[0100] This method was developed for independent, large-capacity, high-DC voltage energy storage systems. It can efficiently utilize the electrical energy of the energy storage system to achieve local consumption of self-generated electricity. It has considerable practicality and feasibility, and can be industrialized and commercialized to form actual products. It can also be extended to all industrial and civil air conditioning systems with large-capacity, high-voltage DC power supply and distribution conditions.

[0101] This invention also provides a power balancing adjustment device for use in the DC converter air conditioning system 1 provided in this invention embodiment; Figure 5 As shown, the device includes:

[0102] The acquisition module 501 is used by the main controller to acquire the first electrical parameters sent by at least one DC converter transformer unit in the DC converter air conditioning system, the second electrical parameters of each group of energy storage battery packs, and the ambient temperature parameters uploaded by the ambient temperature sensor; for details, please refer to the relevant description of step 101 in the above method embodiment.

[0103] The determination module 502 is used by the main controller to determine the second voltage adjustment value of each DC air conditioning device in the DC converter air conditioning system based on the first electrical parameters and the ambient temperature parameters, and to determine the first voltage adjustment value based on the second voltage adjustment value of each DC air conditioning device; for details, please refer to the relevant description of step 102 in the above method embodiment.

[0104] The transmitting module 503 is used by the main controller to send the first voltage adjustment value and the second electrical parameter to the adjustable voltage divider connected in each of the energy storage battery packs, and to send the second voltage adjustment value to the DC-DC converter transformer unit; for details, please refer to the relevant description of step 103 in the above method embodiment.

[0105] The first adjustment module 504 is used for the adjustable voltage divider to adjust the terminal voltage of each group of energy storage battery packs according to the first voltage adjustment value and the second electrical parameters, to obtain the first voltage value of each group of energy storage battery packs, and to send the first voltage value to the main controller; for details, please refer to the relevant description of step 104 in the above method embodiment.

[0106] The second adjustment module 505 is used by the DC converter transformer unit to adjust the terminal voltage of the DC air conditioner according to the second voltage adjustment value, to obtain the second voltage value of each DC air conditioner, and to send the second voltage value to the main controller; for details, please refer to the relevant description of step 105 in the above method embodiment.

[0107] The judgment module 506 is used by the main controller to determine whether the terminal voltage of each DC air conditioning device is balanced based on the first voltage value and the second voltage value. The terminal voltage is used to adjust the output power of the DC air conditioning device. For details, please refer to the relevant description of step 106 in the above method embodiment.

[0108] The power balancing adjustment device provided in this embodiment of the invention uses the current ambient temperature parameters and the electrical parameters of the DC air conditioning units to determine the voltage adjustment value of each DC air conditioning unit and the overall voltage adjustment value of the DC converter air conditioning system. Further, it uses adjustable voltage dividers and DC converter transformer units for adjustment. Finally, the main controller determines whether the output power of each DC air conditioning unit is balanced based on the adjustment results. Therefore, by implementing this invention, power balancing adjustment of the DC air conditioning units can be achieved through adjustment using adjustable voltage dividers and DC converter transformer units.

[0109] For a detailed description of the function of the power equalization adjustment device provided in the embodiments of the present invention, please refer to the power equalization adjustment method description in the above embodiments.

[0110] This invention also provides a storage medium, such as... Figure 6 As shown, a computer program 601 is stored thereon. When executed by a processor, this program implements the steps of the power equalization adjustment method described in the above embodiments. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium may also include combinations of the above types of memory.

[0111] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0112] This invention also provides an electronic device, such as... Figure 7 As shown, the electronic device may include a processor 71 and a memory 72, wherein the processor 71 and the memory 72 may be connected via a bus or other means. Figure 7 Taking the example of a connection between China and Israel via a bus.

[0113] Processor 71 can be a central processing unit (CPU). Processor 71 can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0114] The memory 72, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the corresponding program instructions / modules in the embodiments of the present invention. The processor 71 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions, and modules stored in the memory 72, thereby realizing the power equalization adjustment method in the above method embodiments.

[0115] The memory 72 may include a program storage area and a data storage area. The program storage area may store application programs required for operating the device and at least one function; the data storage area may store data created by the processor 71, etc. Furthermore, the memory 72 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 72 may optionally include memory remotely located relative to the processor 71, and these remote memories may be connected to the processor 71 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0116] The one or more modules are stored in the memory 72, and when executed by the processor 71, they perform the following: Figure 4 The power equalization adjustment method in the illustrated embodiment.

[0117] For specific details regarding the aforementioned electronic devices, please refer to the relevant documentation. Figure 4 The relevant descriptions and effects in the illustrated embodiments are for understanding purposes only and will not be repeated here.

[0118] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A DC converter air conditioning system, characterized in that, include: At least one DC air conditioning unit, each of the DC air conditioning units comprising a DC compressor motor; At least one set of energy storage battery packs, each set of energy storage battery packs including at least one set of sub-energy storage battery packs, each set of sub-energy storage battery packs being used to output voltage to each of the DC air conditioning units, causing the DC compressor motor to rotate according to the output voltage; The main controller, connected to each of the energy storage battery packs, is used to acquire ambient temperature parameters, first electrical parameters of each of the DC air conditioning devices, and second electrical parameters of each of the energy storage battery packs, and to determine a first voltage adjustment value based on the first electrical parameters and the ambient temperature parameters, and to send the first voltage adjustment value and the second electrical parameters to an adjustable voltage divider. The first electrical parameters include the rated power, rated voltage, rated current, and operating temperature of the DC air conditioning device, and the second electrical parameters include the battery power, voltage, battery cell internal resistance, and current of the energy storage battery pack. At least one of the adjustable voltage dividers, each of the adjustable voltage dividers being connected in series to each of the energy storage battery packs, is used to adjust the terminal voltage of each of the energy storage battery packs according to the first voltage adjustment value and the second electrical parameter, to obtain a first voltage value for each of the energy storage battery packs, so that the energy storage battery packs control the DC air conditioning device using the first voltage value; The method of determining a first voltage adjustment value based on the first electrical parameter and the ambient temperature parameter includes: determining a target difference in ambient temperature based on the ambient temperature parameter; calculating a target change in output speed for each DC air conditioning unit based on the target difference in ambient temperature; determining the correlation between the induced voltage and output speed of the DC compressor motor based on the target change in output speed of each DC air conditioning unit and the principle of the DC compressor motor; obtaining the output speed value of each DC compressor motor; determining the voltage change value of each DC air conditioning unit based on each output speed value and the correlation; determining the voltage change value based on the voltage change value of each DC air conditioning unit; and determining the first voltage adjustment value based on the voltage change value and the current voltage value of the DC air conditioning unit.

2. The DC converter air conditioning system according to claim 1, characterized in that, The main controller determines a first voltage adjustment value based on the first electrical parameter and the ambient temperature parameter, including: The main controller determines a second voltage adjustment value for each DC air conditioning unit based on a first electrical parameter of each DC air conditioning unit and the ambient temperature parameter; The main controller determines the first voltage adjustment value based on the second voltage adjustment value of each of the DC air conditioning units.

3. The DC converter air conditioning system according to claim 2, characterized in that, The system also includes: At least one DC-DC converter unit, each of which is connected to the main controller and the DC air conditioning unit respectively, is used to receive the second voltage adjustment value sent by the main controller, adjust the terminal voltage of the DC air conditioning unit according to the second voltage adjustment value to obtain the second voltage value of each DC air conditioning unit, and control the DC air conditioning unit using the second voltage value.

4. The DC converter air conditioning system according to claim 3, characterized in that, The main controller is also configured to receive the first voltage value and the second voltage value, and to determine whether the terminal voltage of each DC air conditioning device is balanced based on the first voltage value and the second voltage value.

5. The DC converter air conditioning system according to claim 3, characterized in that, Each of the DC converter transformer units is also used to measure the first electrical parameter of each of the DC air conditioning units, and to send the first electrical parameter to the main controller.

6. The DC converter air conditioning system according to claim 1, characterized in that, The system also includes: An ambient temperature sensor is used to collect the ambient temperature parameters and send the ambient temperature parameters to the main controller.

7. A power equalization regulation method, used in the DC converter air conditioning system as described in any one of claims 1-6; characterized in that, The method includes: The main controller acquires the first electrical parameters sent by at least one DC converter transformer unit in the DC converter air conditioning system, the second electrical parameters of each group of energy storage battery packs, and the ambient temperature parameters uploaded by the ambient temperature sensor. The first electrical parameters include the rated power, rated voltage, rated current, and operating temperature of the DC air conditioning device. The second electrical parameters include the battery power, voltage, battery cell internal resistance, and current of the energy storage battery pack. The main controller determines a second voltage adjustment value for each DC air conditioning unit in the DC converter air conditioning system based on the first electrical parameters and the ambient temperature parameters, and determines a first voltage adjustment value based on the second voltage adjustment value of each DC air conditioning unit. The main controller sends the first voltage adjustment value and the second electrical parameter to the adjustable voltage divider connected to each of the energy storage battery packs, and sends the second voltage adjustment value to the DC-DC converter 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 parameters to obtain the first voltage value of each group of energy storage battery packs, and sends the first voltage value to the main controller; The DC converter transformer unit adjusts the terminal voltage of the DC air conditioner according to the second voltage adjustment value to obtain the second voltage value of each DC air conditioner, and sends the second voltage value to the main controller; The main controller determines whether the terminal voltage of each DC air conditioning unit is balanced based on the first voltage value and the second voltage value, and the terminal voltage is used to adjust the output power of the DC air conditioning unit. The method of determining the second voltage adjustment value for each DC air conditioning unit in the DC converter air conditioning system based on the first electrical parameter and the ambient temperature parameter includes: determining a target difference in ambient temperature based on the ambient temperature parameter; calculating a target change in output speed for each DC air conditioning unit based on the target difference in ambient temperature; determining the correlation between the induced voltage and output speed of the DC compressor motor based on the target change in output speed of each DC air conditioning unit and the principle of the DC compressor motor; obtaining the output speed value of each DC compressor motor; determining the voltage change value of each DC air conditioning unit based on each output speed value and the correlation; determining the voltage change value based on the voltage change value of each DC air conditioning unit; and determining the first voltage adjustment value based on the voltage change value and the current voltage value of the DC air conditioning unit.

8. A power balancing adjustment device, used in the DC converter air conditioning system as described in any one of claims 1-6; characterized in that, The device includes: The acquisition module is used by the main controller to acquire the first electrical parameters sent by at least one DC converter transformer unit in the DC converter air conditioning system, the second electrical parameters of each group of energy storage battery packs, and the ambient temperature parameters uploaded by the ambient temperature sensor. The first electrical parameters include the rated power, rated voltage, rated current, and operating temperature of the DC air conditioning device, and the second electrical parameters include the battery power, voltage, battery cell internal resistance, and current of the energy storage battery pack. The determination module is used by the main controller to determine a second voltage adjustment value for each DC air conditioning unit in the DC converter air conditioning system based on the first electrical parameters and the ambient temperature parameters, and to determine a first voltage adjustment value based on the second voltage adjustment value of each DC air conditioning unit; The transmitting module is used by the main controller to transmit the first voltage adjustment value and the second electrical parameter to the adjustable voltage divider connected in each of the energy storage battery packs, and to transmit the second voltage adjustment value to the DC-DC converter unit; The first adjustment module is used for the adjustable voltage divider to adjust the terminal voltage of each group of energy storage battery packs according to the first voltage adjustment value and the second electrical parameters, to obtain the first voltage value of each group of energy storage battery packs, and to send the first voltage value to the main controller; The second adjustment module is used for the DC converter transformer unit to adjust the terminal voltage of the DC air conditioner according to the second voltage adjustment value, to obtain the second voltage value of each DC air conditioner, and to send the second voltage value to the main controller; The judgment module is used by the main controller to determine whether the terminal voltage of each DC air conditioning device is balanced based on the first voltage value and the second voltage value, and the terminal voltage is used to adjust the output power of the DC air conditioning device. The determining module, based on the first electrical parameters and the ambient temperature parameters, determines the second voltage adjustment value for each DC air conditioning unit in the DC converter air conditioning system, including: determining a target difference in ambient temperature based on the ambient temperature parameters; calculating a target change in output speed for each DC air conditioning unit based on the target difference in ambient temperature; determining the correlation between the induced voltage and output speed of the DC compressor motor based on the target change in output speed of each DC air conditioning unit and the principle of the DC compressor motor; obtaining the output speed value of each DC compressor motor; determining the voltage change value of each DC air conditioning unit based on each output speed value and the correlation; determining the voltage change value based on the voltage change value of each DC air conditioning unit; and determining the first voltage adjustment value based on the voltage change value and the current voltage value of the DC air conditioning unit.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the power equalization adjustment method as described in claim 7.

10. An electronic device, characterized in that, include: The system includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the power equalization adjustment method as described in claim 7.

Images