Uninterruptible power supply parallel operation control method and system and computer readable storage medium

Abstract

The invention provides an uninterruptible power supply parallel operation control method, an uninterruptible power supply parallel operation control system and a computer readable storage medium. The method comprises the following steps executed by each uninterruptible power supply: obtaining a local operation parameter and an average operation parameter of each uninterruptible power supply in the uninterruptible power supply parallel operation system; generating an operation index of the local machine according to the local machine operation parameter and the average operation parameter; generating output current of a local machine according to the output power of the uninterruptible power supply parallel operation system, the operation index of the local machine and the operation indexes of all uninterruptible power supplies in the uninterruptible power supply parallel operation system; and the output current of the local machine is used as reference current to control the local machine to operate in a closed-loop manner. According to the invention, the aging rate of each uninterruptible power supply of the uninterruptible power supply parallel operation system in China can be at the same level.

Description

Technical Field

[0001] The present invention relates to the field of power supply control, and more specifically, to a method and system for controlling parallel operation of an uninterruptible power supply and a computer-readable storage medium. Background Art

[0002] In order to improve power supply reliability and capacity, in some power supply systems, multiple uninterruptible power supplies (UPS) are connected together through a specific parallel controller to form a parallel system to power the load, as shown in the figure. Existing UPS parallel systems usually operate in a way that multiple UPSs share the load.

[0003] Compared with single-machine operation, the above-mentioned parallel uninterruptible power supply system can effectively improve the operating reliability of the system. However, due to the differences between the individual uninterruptible power supplies in the parallel system, although the load is evenly distributed, the corresponding performance of each single machine will not be completely consistent. If the power supply is strictly distributed in a load-even manner, under the same operating conditions, one machine may fail before the other, thereby reducing the overall operating life of the parallel system and affecting the operation and reliability of the parallel system. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an uninterruptible power supply parallel control method, system and computer-readable storage medium to address the problem that the overall operating life of the above-mentioned uninterruptible power supply system is reduced due to the use of load sharing.

[0005] The technical solution of the present invention to solve the above technical problem is to provide a method for controlling parallel operation of uninterruptible power supplies, which is applied to a parallel operation system of uninterruptible power supplies, wherein the parallel operation system of uninterruptible power supplies comprises a plurality of uninterruptible power supplies connected in parallel and having the same output power, and the method comprises the following steps performed by each uninterruptible power supply:

[0006] Obtaining the local operating parameters and the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system, wherein the local operating parameters include the temperature of the semiconductor switch element, the inductor temperature, the filter temperature, the inlet and outlet temperature difference, the rectifier cumulative output power, and the inverter cumulative output power, and the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system include the average temperature of the semiconductor switch element, the average inductor temperature, the average filter temperature, the inlet and outlet temperature difference, the average cumulative output power of the rectifier, and the average cumulative output power of the inverter;

[0007] Generating an operation index of the machine according to the machine operation parameter and the average operation parameter;

[0008] Generate the output current of the local machine according to the output power of the uninterruptible power supply parallel system, the operation index of the local machine and the operation indexes of all uninterruptible power supplies in the uninterruptible power supply parallel system;

[0009] The output current of the machine is used as the reference current to control the operation of the machine in a closed loop.

[0010] As a further improvement of the present invention, generating the local operation index according to the local operation parameter and the average operation parameter comprises:

[0011] Generate a first index K1 according to the temperature of the semiconductor switch element in the local machine and the average temperature of the semiconductor switch element of the uninterruptible power supply parallel system;

[0012] Generating a second index K2 according to the inductor temperature in the local unit and the average inductor temperature of the uninterruptible power supply parallel system;

[0013] Generate a third index K3 according to the filter temperature in the local machine and the average filter temperature of the uninterruptible power supply parallel system;

[0014] Generate a fourth index K4 based on the temperature difference between the air inlet and outlet of the unit and the average temperature difference between the air inlet and outlet of the uninterruptible power supply parallel system;

[0015] Generate a fifth index K5 according to the cumulative output power of the rectifier in the local unit and the average cumulative output power of the rectifiers of the uninterruptible power supply parallel system;

[0016] Generating a sixth index K6 according to the cumulative output power of the inverter in the local machine and the average cumulative output power of the inverter of the uninterruptible power supply parallel system;

[0017] The operation index K is generated according to the first index K1, the second index K2, the third index K3, the fourth index K4, the fifth index K5, and the sixth index K6.

[0018] As a further improvement of the present invention, the operating index K is calculated by the following formula: K=K1×C1+K2×C2+K3×C3+K4×C4+K5×C5+K6×C6; C1, C2, C3, C4, C5, and C6 are weight coefficients respectively, and C1+C2+C3+C4+C5+C6=100%.

[0019] As a further improvement of the present invention, the first index K1 is the ratio of the temperature of the semiconductor switch element in the local machine to the average temperature of the semiconductor switch element of the uninterruptible power supply parallel system;

[0020] The second index K2 is the ratio of the inductor temperature in the local unit to the average inductor temperature of the uninterruptible power supply parallel system;

[0021] The third index K3 is the ratio of the filter temperature in the local unit to the average filter temperature of the uninterruptible power supply parallel system;

[0022] The fourth index K4 is the ratio of the temperature difference between the air inlet and the air outlet of the unit to the average temperature difference between the air inlet and the air outlet of the uninterruptible power supply parallel system;

[0023] The fifth index K5 is the ratio of the cumulative output power of the rectifier in the local unit to the average cumulative output power of the rectifiers of the uninterruptible power supply parallel system;

[0024] The sixth index K6 is the ratio of the cumulative output power of the inverter in the local unit to the average cumulative output power of the inverter of the uninterruptible power supply parallel system.

[0025] As a further improvement of the present invention, the output current I of the machine is generated by the following calculation formula: I=W_avg×(1-K) / U, wherein W is the output power of the uninterruptible power supply parallel system, W_avg is the average output power of all uninterruptible power supplies in the uninterruptible power supply parallel system, and U is the output voltage of the uninterruptible power supply parallel system.

[0026] As a further improvement of the present invention, the method further comprises the following steps performed by each uninterruptible power supply: sending the local operating parameters to all other uninterruptible power supplies in the uninterruptible power supply parallel system;

[0027] Obtaining average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system, including:

[0028] Obtaining operating parameters of all other uninterruptible power supplies in the uninterruptible power supply parallel system;

[0029] The average value of the sum of the operating parameters of the local uninterruptible power supply and the operating parameters of all other uninterruptible power supplies in the uninterruptible power supply parallel system is calculated, and the average value is used as the average operating parameter of each uninterruptible power supply in the uninterruptible power supply parallel system.

[0030] As a further improvement of the present invention, the uninterruptible power supply parallel system includes a parallel control unit, and the method also includes the following steps performed by each uninterruptible power supply: sending the local operating parameters to the parallel control unit, and the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system are generated by the parallel control unit.

[0031] The present invention also provides an uninterruptible power supply parallel system, comprising a plurality of uninterruptible power supplies connected in parallel, each of the uninterruptible power supplies comprising a memory and a processor, the memory storing a computer program executable by the processor, and the processor implementing the steps of the uninterruptible power supply parallel control method as described above when executing the computer program.

[0032] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the uninterruptible power supply parallel control method described above are implemented.

[0033] The present invention has the following beneficial effects: by making each uninterruptible power supply in the uninterruptible power supply parallel system generate a corresponding output current according to the operation index of the local unit, and using the above output current as the reference current of the local unit to close the loop to control the operation of the local unit, the aging rate of each uninterruptible power supply can be made at the same level, thereby extending the overall service life of the parallel system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the topological structure of the uninterruptible power supply parallel system.

[0035] Figure 2 The present invention is a flowchart of a method for controlling parallel operation of an uninterruptible power supply provided by an embodiment of the present invention.

[0036] Figure 3 The present invention is a flowchart of generating a local operation index in an uninterruptible power supply parallel system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] like Figure 2 As shown, it is a flow chart of the uninterruptible power supply parallel control method of the present invention, and the uninterruptible power supply parallel control method can be applied to the existing uninterruptible power supply parallel system, wherein the uninterruptible power supply parallel system includes a plurality of uninterruptible power supplies connected in parallel and having the same output power (i.e., having the same specifications) and a parallel control unit, each uninterruptible power supply includes a housing, a rectifier, an inverter, an energy storage battery, an inductor, a filter and a control circuit, etc., and can convert the externally connected alternating current (such as the mains) into the power input required by the load. The uninterruptible power supply parallel system and the hardware structure of the uninterruptible power supply are common knowledge in the art and will not be repeated here.

[0039] The uninterruptible power supply parallel system control method of this embodiment can be integrated into each uninterruptible power supply in the parallel system, for example, integrated into the control circuit of each uninterruptible power supply. Accordingly, the method of this embodiment includes the following steps performed by each uninterruptible power supply:

[0040] Step S21: Obtain the local operating parameters and the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system, wherein the local operating parameters include the semiconductor switching elements in the local unit (i.e., the switching devices in the rectifier and the inverter), the inductor temperature, the filter temperature, the inlet and outlet temperature difference (i.e., the outlet temperature - the inlet temperature), the rectifier cumulative output power, and the inverter cumulative output power.

[0041] The temperature of the semiconductor switch element can be detected by the temperature sensor installed near the rectifier and the inverter, the inductor temperature can be detected by the temperature sensor installed on the inductor, the filter temperature can be detected by the temperature sensor installed on the filter, the inlet and outlet temperature difference can be calculated and generated by the temperature sensors installed at the inlet and outlet of the chassis respectively, the rectifier cumulative output power can be calculated based on the output voltage and output current of the rectifier in each time period, and the inverter cumulative output power can be calculated based on the output voltage and output current of the inverter in each time period. The above temperature sensors are connected to the control circuit, and the control circuit converts the output signals of these temperature sensors into corresponding temperature data.

[0042] Accordingly, the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system include the average temperature of semiconductor switch elements, the average temperature of inductors, the average temperature of filters, the average temperature difference between air inlets and outlets, the average cumulative output power of rectifiers, and the average cumulative output power of inverters. The above average temperature of semiconductor switch elements, the average temperature of inductors, the average temperature of filters, the average temperature difference between air inlets and outlets, the average cumulative output power of rectifiers, and the average cumulative output power of inverters can be calculated based on the operating parameters of each uninterruptible power supply.

[0043] Step S22: Generate the local operation index according to the local operation parameters and the average operation parameters.

[0044] Since the temperature of the semiconductor switch element, inductor temperature, filter temperature, inlet and outlet temperature difference, rectifier cumulative output power, and inverter cumulative output power in the uninterruptible power supply are all related to the health status of the uninterruptible power supply, for example, when the uninterruptible power supply is running, the higher the temperature of the semiconductor switch element, the worse its health status; the higher the inductor temperature, the worse its health status; the higher the filter temperature, the worse its health status; the greater the inlet and outlet temperature difference, the worse its health status; the higher the rectifier cumulative output power, the worse its health status; the higher the inverter cumulative output power, the worse its health status. Therefore, the local operating parameters generated based on the local operating parameters and the average operating parameters can, to a certain extent, represent the difference in health status of the current uninterruptible power supply relative to other uninterruptible power supplies in the uninterruptible power supply parallel system. The larger the local operating index, the more severe the corresponding uninterruptible power supply aging.

[0045] Step S23: generating the output current of the local unit according to the output power of the uninterruptible power supply parallel system, the operation index of the local unit and the operation indexes of all the uninterruptible power supplies in the uninterruptible power supply parallel system.

[0046] That is to say, the operation index of the local machine is added to the current sharing control loop of the inverter of the uninterruptible power supply as the amplification factor of the local output current, instead of being evenly distributed according to the number of uninterruptible power supplies in the uninterruptible power supply parallel system.

[0047] Step S24: Using the output current of the machine as a reference current, the operation of the machine is controlled in a closed loop. The operation of the uninterruptible power supply is controlled in a closed loop according to the reference current, which is a well-known technology in the art and will not be described in detail here.

[0048] The above-mentioned uninterruptible power supply parallel control method can make the aging rate of each uninterruptible power supply at the same level by making each uninterruptible power supply in the uninterruptible power supply parallel system generate a corresponding output current according to the operation index of the local unit, and use the above-mentioned output current as the reference current of the local unit to close the loop to control the operation of the local unit, thereby extending the overall service life of the parallel system.

[0049] like Figure 3 As shown, in one embodiment of the present invention, the operation index of the local machine is generated according to the local operation parameters and the average operation parameters in the above step S22, which may specifically include the following steps:

[0050] Step S221: Generate a first index K1 according to the temperature of the semiconductor switch element in the local machine and the average temperature of the semiconductor switch element in the uninterruptible power supply parallel system. Specifically, the first index K1 may be a ratio T1 / T1_avg of the temperature T1 of the semiconductor switch element in the local machine and the average temperature T1_avg of the semiconductor switch element in the uninterruptible power supply parallel system. For example, when the temperature of the semiconductor switch element in the local machine is 50 degrees and the average temperature of the semiconductor switch element in the parallel system is 60 degrees, the first index K1=50 / 60=83%.

[0051] Step S222: Generate a second index K2 according to the inductor temperature in the local machine and the average inductor temperature of the uninterruptible power supply parallel system. Specifically, the second index K2 may be a ratio T2 / T2_avg of the inductor temperature T2 in the local machine and the average inductor temperature T2_avg of the uninterruptible power supply parallel system. For example, when the inductor temperature in the local machine is 60 degrees and the average inductor temperature in the parallel system is 50 degrees, the second index K2=60 / 50=120%.

[0052] Step S223: Generate a third index K3 according to the filter temperature in the local machine and the average filter temperature of the uninterruptible power supply parallel system. Specifically, the third index K3 may be a ratio T3 / T3_avg of the filter temperature T3 in the local machine and the average filter temperature T3_avg of the uninterruptible power supply parallel system. For example, when the temperature of the filter in the local machine is 50 degrees and the average filter temperature in the parallel system is 40 degrees, the third index K3 = 50 / 40 = 125%.

[0053] Step S224: Generate a fourth index K4 according to the temperature difference between the air inlet and outlet of the machine and the average temperature difference between the air inlet and outlet of the uninterruptible power supply parallel system. Specifically, the fourth index K4 can be the ratio T4 / T4_avg of the temperature difference between the air inlet and outlet of the machine and the average temperature difference T4_avg of the air inlet and outlet of the uninterruptible power supply parallel system. For example, when the temperature difference between the air inlet and outlet of the machine is 30 degrees and the average temperature difference between the air inlet and outlet of the parallel system is 40 degrees, the fourth index K4=30 / 40=75%.

[0054] Step S225: Step S221: Generate a fifth index K5 according to the cumulative output power of the rectifier in the local machine and the average cumulative output power of the rectifier of the uninterruptible power supply parallel system. Specifically, the fifth index K5 can be the ratio Prec / Prec_avg of the cumulative output power Prec of the rectifier in the local machine and the average cumulative output power Prec_avg of the rectifier of the uninterruptible power supply parallel system.

[0055] Step S226: Generate a sixth index K6 according to the local inverter cumulative output power and the average cumulative inverter output power of the uninterruptible power supply parallel system. Specifically, the sixth index K6 may be the ratio Pinv / Pinv_avg of the local inverter cumulative output power Pinv and the average cumulative inverter output power Pinv_avg of the uninterruptible power supply parallel system.

[0056] Step S227: Generate an operation index K according to the first index K1, the second index K2, the third index K3, the fourth index K4, the fifth index K5, and the sixth index K6.

[0057] Specifically, the operation index K can be calculated by the following formula: K = K1 × C1 + K2 × C2 + K3 × C3 + K4 × C4 + K5 × C5 + K6 × C6, where C1, C2, C3, C4, C5, C6 are weight coefficients, and C1 + C2 + C3 + C4 + C5 + C6 = 100%. In addition, the weight coefficients C1, C2, C3, C4, C5, C6 can be set in advance according to experience (or experimental data).

[0058] In one embodiment of the present invention, in the above step S23, the output current I of the local machine is generated by the following calculation formula: I=W_avg×(1-K) / U, wherein W_avg is the average output power of all uninterruptible power supplies in the uninterruptible power supply parallel system, that is, W_avg=W / n (W is the output power of the uninterruptible power supply parallel system, n is the number of uninterruptible power supplies in the uninterruptible power supply parallel system), and U is the output voltage of the uninterruptible power supply parallel system.

[0059] In one embodiment of the present invention, the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system in the above step S21 can be calculated and generated by each uninterruptible power supply, and accordingly, the method also includes the following steps performed by each uninterruptible power supply: sending the local operating parameters to all other uninterruptible power supplies in the uninterruptible power supply parallel system; at the same time, obtaining the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system in the above step S21 includes: obtaining the operating parameters of all other uninterruptible power supplies in the uninterruptible power supply parallel system; calculating the average value of the sum of the local operating parameters and the operating parameters of all other uninterruptible power supplies in the uninterruptible power supply parallel system, and using the calculated average value as the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system.

[0060] In addition, the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system in the above step S21 can be generated by the parallel control unit of the parallel system. Accordingly, the above method also includes the following steps performed by each uninterruptible power supply: sending the local operating parameters to the parallel control unit, and the parallel control unit calculating and generating the average operating parameters based on the operating parameters from each uninterruptible power supply.

[0061] The present invention also provides an uninterruptible power supply parallel system, comprising a plurality of uninterruptible power supplies connected in parallel, each of the uninterruptible power supplies comprising a memory and a processor, the memory storing a computer program executable by the processor, and the processor implementing the steps of the uninterruptible power supply parallel control method as described above when executing the computer program.

[0062] The uninterruptible power supply parallel system in this embodiment is similar to the above Figure 2-3 The uninterruptible power supply parallel control method in the corresponding embodiment belongs to the same concept, and its specific implementation process is detailed in the corresponding method embodiment, and the technical features in the method embodiment are correspondingly applicable in the device embodiment, which will not be repeated here.

[0063] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the uninterruptible power supply parallel control method described above are implemented.

[0064] The computer-readable storage medium in this embodiment is the same as the above Figure 2-3 The uninterruptible power supply parallel control method in the corresponding embodiment belongs to the same concept, and its specific implementation process is detailed in the corresponding method embodiment, and the technical features in the method embodiment are correspondingly applicable in the storage medium embodiment, which will not be repeated here.

[0065] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0066] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different functional units and modules as needed. The functional units and modules in the embodiments can be integrated into a processor, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0067] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0068] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0069] In the embodiments provided in the present application, it should be understood that the disclosed uninterruptible power supply parallel control method and uninterruptible power supply parallel system can be implemented in other ways. For example, the uninterruptible power supply parallel system embodiment described above is only illustrative.

[0070] In addition, each functional unit in each embodiment of the present application may be integrated into one processor, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0071] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or interface switching device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0072] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for controlling a parallel uninterruptible power supply, applied to a parallel uninterruptible power supply system, wherein the parallel uninterruptible power supply system comprises a plurality of parallel-connected uninterruptible power supplies having the same output power, characterized in that: The method comprises the following steps performed by each uninterruptible power supply: Obtaining the local operating parameters and the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system, wherein the local operating parameters include the temperature of the semiconductor switch element, the inductor temperature, the filter temperature, the inlet and outlet temperature difference, the rectifier cumulative output power, and the inverter cumulative output power, and the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system include the average temperature of the semiconductor switch element, the average inductor temperature, the average filter temperature, the inlet and outlet temperature difference, the average cumulative output power of the rectifier, and the average cumulative output power of the inverter; Generating an operation index of the machine according to the machine operation parameter and the average operation parameter; Generate the output current of the local machine according to the output power of the uninterruptible power supply parallel system, the operation index of the local machine and the operation indexes of all the uninterruptible power supplies in the uninterruptible power supply parallel system; The output current of the machine is used as the reference current to control the operation of the machine in a closed loop.

2. The uninterruptible power supply parallel control method according to claim 1, characterized in that: Generating the operation index of the local machine according to the local machine operation parameter and the average operation parameter comprises: Generate a first index K1 according to the temperature of the semiconductor switch element in the local machine and the average temperature of the semiconductor switch element of the uninterruptible power supply parallel system; Generate a second index K2 according to the inductor temperature in the local unit and the average inductor temperature of the uninterruptible power supply parallel system; Generate a third index K3 according to the filter temperature in the local unit and the average filter temperature of the uninterruptible power supply parallel system; Generate a fourth index K4 according to the temperature difference between the air inlet and the air outlet of the unit and the average temperature difference between the air inlet and the air outlet of the uninterruptible power supply parallel system; Generate a fifth index K5 according to the cumulative output power of the rectifier in the local unit and the average cumulative output power of the rectifiers of the uninterruptible power supply parallel system; Generating a sixth index K6 according to the cumulative output power of the inverter in the local machine and the average cumulative output power of the inverter of the uninterruptible power supply parallel system; The operation index K is generated according to the first index K1, the second index K2, the third index K3, the fourth index K4, the fifth index K5, and the sixth index K6.

3. The uninterruptible power supply parallel control method according to claim 2, characterized in that: The operation index K is calculated by the following formula: K=K1×C1+K2×C2+K3×C3+K4×C4+K5×C5+K6×C6; C1, C2, C3, C4, C5, C6 are weight coefficients respectively, and C1+C2+C3+C4+C5+C6=100%.

4. The uninterruptible power supply parallel control method according to claim 3, characterized in that: The first index K1 is the ratio of the temperature of the semiconductor switch element in the local device to the average temperature of the semiconductor switch element of the uninterruptible power supply parallel system; The second index K2 is the ratio of the inductor temperature in the local unit to the average inductor temperature of the uninterruptible power supply parallel system; The third index K3 is the ratio of the filter temperature in the local unit to the average filter temperature of the uninterruptible power supply parallel system; The fourth index K4 is the ratio of the temperature difference between the air inlet and the air outlet of the unit to the average temperature difference between the air inlet and the air outlet of the uninterruptible power supply parallel system; The fifth index K5 is the ratio of the cumulative output power of the rectifier in the local unit to the average cumulative output power of the rectifiers of the uninterruptible power supply parallel system; The sixth index K6 is the ratio of the cumulative output power of the inverter in the local unit to the average cumulative output power of the inverter of the uninterruptible power supply parallel system.

5. The uninterruptible power supply parallel control method according to claim 1, characterized in that: The output current I of this machine is generated by the following calculation formula: I=W_avg×(1-K) / U, where W is the output power of the uninterruptible power supply parallel system, W_avg is the average output power of all uninterruptible power supplies in the uninterruptible power supply parallel system, and U is the output voltage of the uninterruptible power supply parallel system.

6. The uninterruptible power supply parallel control method according to claim 1, characterized in that: The method further includes the following steps performed by each uninterruptible power supply: sending local operating parameters to all other uninterruptible power supplies in the uninterruptible power supply parallel system; Obtaining average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system, including: Obtaining operating parameters of all other uninterruptible power supplies in the uninterruptible power supply parallel system; The average value of the sum of the operating parameters of the local uninterruptible power supply and the operating parameters of all other uninterruptible power supplies in the uninterruptible power supply parallel system is calculated, and the average value is used as the average operating parameter of each uninterruptible power supply in the uninterruptible power supply parallel system.

7. The uninterruptible power supply parallel control method according to claim 1, characterized in that: The uninterruptible power supply parallel system includes a parallel control unit, and the method also includes the following steps performed by each uninterruptible power supply: sending local operating parameters to the parallel control unit, and the average operating parameters of each uninterruptible power supply in the uninterruptible power supply parallel system are generated by the parallel control unit.

8. An uninterruptible power supply parallel system, characterized in that: It comprises a plurality of uninterruptible power supplies connected in parallel, each of the uninterruptible power supplies comprises a memory and a processor, the memory stores a computer program executable by the processor, and the processor implements the steps of the uninterruptible power supply parallel control method as claimed in any one of claims 1 to 7 when executing the computer program.

9. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the uninterruptible power supply parallel control method as claimed in any one of claims 1 to 7 are implemented.

Images