Diesel generator capacity selection calculation method and device based on demand coefficient method

Abstract

The invention discloses a diesel generator capacity selection calculation method and device based on a demand coefficient method, a diesel generator comprises a continuously operating motor unit or diesel generator unit, and the method comprises the following steps: determining a demand coefficient and a power factor angle tangent value according to electrical loads with similar properties, calculating to obtain diesel generator calculated active power and diesel generator calculated apparent power; the power factor angle tangent value is determined according to the power factor; the short-time overload capacity is determined according to the maximum reactive power of the electrical load during group starting or self-starting; according to the diesel generator calculated active power, the diesel generator calculated apparent power and the short-time overload capacity, determining the diesel generator selection capacity according to a preset first condition; calculating the maximum starting load voltage drop of the diesel generator according to the selected capacity of the diesel generator; and determining the target capacity of the diesel generator according to a preset second condition, the selected capacity of the diesel generator and the maximum starting load voltage drop of the diesel generator.

Description

Technical Field

[0001] This invention relates to the field of industrial building electrical technology, specifically to a calculation method and apparatus for selecting the capacity of a diesel generator based on the demand factor method. Background Technology

[0002] In many important industrial sites, diesel generators are indispensable key equipment and the preferred choice for backup power or mains power in industrial buildings. If the diesel generator capacity is too small, it may be unable to power all equipment, affecting normal operation and even causing significant economic losses and operational accidents; conversely, if the diesel generator capacity is too large, it will increase equipment costs and lead to resource waste. Therefore, selecting the appropriate diesel generator capacity is crucial.

[0003] In existing technologies, the calculation of diesel generator capacity typically employs cumbersome formulas and complex parameters. These calculation methods are complex and difficult to understand. Therefore, there is an urgent need for a calculation method suitable for industrial construction applications, which can significantly simplify the calculation process while ensuring reasonable system capacity and economical operation. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention are proposed to provide a calculation method and apparatus for selecting diesel generator capacity based on the demand factor method to overcome or at least partially solve the above problems.

[0005] According to one aspect of the present invention, a calculation method for selecting the capacity of a diesel generator based on the demand factor method is provided. The diesel generator includes a continuously operating electric motor unit or a diesel generator unit. The method includes: The demand factor and power factor tangent are determined based on the electrical load of the same type, and the calculated active power and calculated apparent power of the diesel generator are calculated; the power factor tangent is determined based on the power factor. Determine the short-time overload capacity based on the maximum reactive power of the electrical load during group startup or self-starting; The selected capacity of the diesel generator is determined according to the calculated active power, calculated apparent power, and short-time overload capacity of the diesel generator, based on the preset first condition. Based on the selected capacity of the diesel generator, the maximum load voltage drop at startup of the diesel generator is calculated; The target capacity of the diesel generator is determined based on the preset second condition, the selected capacity of the diesel generator, and the maximum load voltage drop at startup of the diesel generator.

[0006] According to another aspect of the present invention, a calculation device for selecting the capacity of a diesel generator based on the demand factor method is provided. The diesel generator includes a continuously operating electric motor unit or a diesel generator unit. The device includes: The power calculation module is suitable for determining the demand factor and power factor tangent value based on similar types of electrical loads, and for calculating the calculated active power and calculated apparent power of the diesel generator; the power factor tangent value is determined based on the power factor. The short-time overload capacity calculation module is suitable for determining the short-time overload capacity based on the maximum reactive power of the electrical load during group startup or self-starting. The selection module is suitable for determining the selected capacity of the diesel generator according to the calculated active power, calculated apparent power and short-time overload capacity of the diesel generator based on a preset first condition. The voltage drop calculation module is suitable for calculating the maximum load voltage drop of a diesel generator when it starts, based on the selected capacity of the diesel generator. The target determination module is suitable for determining the target capacity of the diesel generator based on a preset second condition, the selected capacity of the diesel generator, and the maximum load voltage drop of the diesel generator during startup.

[0007] According to another aspect of the present invention, a computing device is provided, comprising: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other through the communication bus; The memory is used to store at least one executable instruction that causes the processor to perform the operation corresponding to the above-described calculation method for selecting the capacity of a diesel generator based on the demand factor method.

[0008] According to another aspect of the present invention, a computer storage medium is provided, the storage medium storing at least one executable instruction, the executable instruction causing a processor to perform an operation corresponding to the above-described calculation method for selecting the capacity of a diesel generator based on the demand factor method.

[0009] According to another aspect of the present invention, a computer program product is provided, comprising at least one executable instruction that causes a processor to perform an operation corresponding to the calculation method for selecting diesel generator capacity based on the demand factor method described above.

[0010] The calculation method and apparatus for selecting diesel generator capacity based on the demand factor method provided in the embodiments of the present invention greatly simplify the calculation process, and the diesel generator capacity can be determined through simple calculation, while ensuring that the diesel generator system capacity is reasonable and the operation is economical.

[0011] The above description is merely an overview of the technical solutions of the embodiments of the present invention. In order to better understand the technical means of the embodiments of the present invention and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of the present invention more obvious and understandable, specific implementation methods of the embodiments of the present invention are described below. Attached Figure Description

[0012] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A flowchart of a calculation method for selecting diesel generator capacity based on the demand factor method according to an embodiment of the present invention is shown; Figure 2 A schematic diagram showing the mathematical relationship between the calculated apparent power, calculated active power, calculated reactive power, and power factor angle of a diesel generator is presented. Figure 3 A schematic diagram of a calculation device for selecting diesel generator capacity based on the demand factor method according to an embodiment of the present invention is shown. Figure 4 A schematic diagram of the structure of a computing device according to an embodiment of the present invention is shown. Detailed Implementation

[0013] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0014] Figure 1 A flowchart illustrating a calculation method for selecting diesel generator capacity based on the demand factor method according to an embodiment of the present invention is shown, as follows: Figure 1 As shown, the method includes the following steps: Step S101: Determine the demand factor and power factor tangent based on the electrical load of the same type, and calculate the calculated active power and calculated apparent power of the diesel generator.

[0015] In this embodiment, the diesel generator includes a continuously operating electric motor unit or a diesel generator unit. For the diesel generator, the demand factor and power factor are determined based on the similar type of electrical load, and the power factor tangent is determined based on the power factor. Similar types of diesel generators are defined by their electrical load. For example, an industrial site has two fire hydrant pumps, one on standby and one in operation, and two pressure-stabilizing pumps, one on standby and one in operation. The fire hydrant pumps and pressure-stabilizing pumps are both types of diesel generators. Based on the similarity of their characteristics, the corresponding electrical load is determined. For example, each fire hydrant pump has a power of 37kW, and each pressure-stabilizing pump has a power of 1.5kW, etc. The above are just examples and are not limited here.

[0016] The correspondence between power factor and power factor tangent is shown in Table 1 below: Table 1

[0017] The first column is the power factor, and the second column is the power factor tangent. The corresponding power factor tangent is determined based on the power factor.

[0018] After determining the demand factor and the power factor tangent, the sum of the rated power of similar electrical loads can be obtained. The calculated active power of the diesel generator is obtained by multiplying the demand factor and the sum of the rated power of similar electrical loads. The calculated reactive power of the diesel generator is obtained by multiplying the calculated active power and the power factor tangent. The sum of the squares of the calculated active power and the calculated reactive power of the diesel generator is then calculated. The square root of this sum is used to obtain the calculated apparent power of the diesel generator. The specific formula is shown below: ∑

[0019] =

[0020]

[0021] Where K is the demand coefficient, ∑ It is the sum of the rated power of electrical loads of the same type. The power factor tangent is the value of the angle. Calculate the active power of the diesel generator. Calculate the reactive power of the diesel generator. Calculate the apparent power of the diesel generator.

[0022] In calculations, the relationships between the active power, reactive power, apparent power, and power factor angle of a diesel generator are as follows: Figure 2 As shown, 1 represents the calculated apparent power of the diesel generator, 2 represents the calculated active power of the diesel generator, 3 represents the calculated reactive power of the diesel generator, and 4 represents the power factor angle.

[0023] Step S102: Determine the short-time overload capacity based on the maximum reactive power of the electrical load during group startup or self-starting.

[0024] The short-time overload capacity can be calculated based on the ratio of the maximum reactive power of the electrical load during group start-up or self-starting to the short-time overload coefficient of the diesel generator, as shown below:

[0025] in, This represents the maximum load for group startup or automatic startup. This is the short-time overload factor for the diesel generator, with a value ranging from 1.3 to 1.5. In this embodiment, the value is 1.5. This refers to the short-term overload capacity of the diesel generator.

[0026] The maximum reactive power of the electrical load during group start-up or self-starting can be determined based on the historical data of the diesel generator, and is not limited here.

[0027] Step S103: Determine the selected capacity of the diesel generator according to the calculated active power, calculated apparent power and short-time overload capacity of the diesel generator based on the preset first condition.

[0028] Based on the calculated active power and calculated apparent power of the diesel generator obtained in step S101, and the short-time overload capacity obtained in step S102, the selected capacity of the diesel generator can be determined according to a preset first condition. The selected capacity of the diesel generator includes the selected rated active power and the selected rated apparent power. The preset first condition specifically includes: determining the selected rated active power of the diesel generator based on its calculated active power, wherein the selected rated active power is greater than the calculated active power; and determining the selected rated apparent power of the diesel generator based on its calculated apparent power and short-time overload capacity, wherein the selected rated apparent power is greater than the calculated apparent power and the selected rated apparent power is greater than the short-time overload capacity.

[0029] Step S104: Calculate the maximum load voltage drop of the diesel generator during startup based on the selected capacity of the diesel generator.

[0030] Based on the selected rated active power of the diesel generator within the chosen capacity, and considering the transient reactance, subtransient reactance, and maximum active power of the electrical load during group starting or self-starting, the maximum load voltage drop of the diesel generator during startup is calculated as follows:

[0031]

[0032] in, The maximum load voltage drop during diesel generator startup. Select the rated active power for the diesel generator. This represents the maximum active power of the electrical load during group startup or self-starting. For the transient reactance of the diesel generator, Let X be the subtransient reactance of the diesel generator, and let X be an intermediate variable, which is the average value of the transient reactance and the subtransient reactance of the diesel generator.

[0033] The transient reactance and subtransient reactance of a diesel generator can be determined based on empirical values ​​or historical data, and are not limited here.

[0034] Step S105: Determine the target capacity of the diesel generator based on the preset second condition, the selected capacity of the diesel generator, and the maximum load voltage drop of the diesel generator during startup.

[0035] When determining the target capacity of a diesel generator, a judgment can be made based on a preset second condition. This condition includes determining whether the selected capacity of the diesel generator has a rated apparent power greater than its calculated apparent power and a rated apparent power greater than its short-time overload capacity, and whether the selected active power is greater than its calculated active power, and whether the maximum starting load voltage drop of the diesel generator is less than or equal to a preset threshold. The preset threshold can be set according to the implementation situation, such as 25%. If so, the target capacity of the diesel generator can be determined based on the selected capacity and the maximum starting load voltage drop. That is, the target capacity includes the rated apparent power of the diesel generator that is greater than both its calculated and short-time overload capacity, the rated active power that is greater than its calculated active power, and the maximum starting load voltage drop that is less than or equal to the preset threshold.

[0036] In one optional embodiment, an industrial site may have two fire hydrant pumps, one for standby and one for operation, each with a power of 37kW, and two pressure-stabilizing pumps, one for standby and one for operation, each with a power of 1.5kW. The fire hydrant pumps are equipped with a complete electrical control cabinet and frequency converter. The calculation data required for selecting the diesel generator capacity are shown in Table 2 below. These calculation data are determined based on historical data or empirical values, or according to the implementation situation; no specific limitations are imposed here. Table 2

[0037] Based on the calculation data shown in Table 2, the target capacity of the diesel generator is calculated according to this embodiment, as shown in Table 3. If the target capacity of the diesel generator is determined to have a rated apparent power of 50, a rated active power of 40, and a maximum starting load voltage drop of 21.74%, then the rated apparent power of the diesel generator must be greater than the calculated apparent power and greater than the short-time overload capacity, the rated active power must be greater than the calculated active power, and the maximum starting load voltage drop must be less than or equal to a preset threshold. Furthermore, in this embodiment, the calculated apparent power of the diesel generator is close to the rated apparent power. In actual engineering applications, the rated apparent power of the diesel generator can be increased by one level, such as 63. The above is an example; specific settings should be made according to the implementation situation, and no limitation is made here.

[0038] Table 3

[0039] The calculation method for selecting diesel generator capacity based on the demand factor method provided in this embodiment of the invention greatly simplifies the calculation process. The diesel generator capacity can be determined through simple calculation, and the capacity of the diesel generator system is guaranteed to be reasonable and the operation economical.

[0040] Figure 3 This diagram illustrates the structure of a calculation device for selecting diesel generator capacity based on the demand factor method, as provided in an embodiment of the present invention. The diesel generator includes a continuously operating electric motor unit or a diesel generator unit, such as... Figure 3 As shown, the device includes: The power calculation module 310 is suitable for determining the demand factor and power factor tangent value based on the same type of electrical load, and calculating the calculated active power and calculated apparent power of the diesel generator; the power factor tangent value is determined based on the power factor. The short-time overload capacity calculation module 320 is suitable for determining the short-time overload capacity based on the maximum reactive power of the electrical load during group startup or self-starting. Module 330 is selected to determine the selected capacity of the diesel generator according to the calculated active power, calculated apparent power and short-time overload capacity of the diesel generator based on a preset first condition. The voltage drop calculation module 340 is suitable for calculating the maximum load voltage drop of the diesel generator based on the selected capacity of the diesel generator. The target determination module 350 is adapted to determine the target capacity of the diesel generator based on a preset second condition, the selected capacity of the diesel generator, and the maximum load voltage drop of the diesel generator at startup.

[0041] Optionally, the power calculation module 310 is further adapted to: Determine the demand factor and power factor based on the electrical load of the same type, and determine the power factor tangent based on the power factor. The calculated active power of the diesel generator is obtained by multiplying the demand factor and the sum of the rated power of similar electrical loads. The calculated reactive power of the diesel generator is obtained by multiplying the calculated active power of the diesel generator by the tangent of the power factor angle. The sum of the squares of the calculated active power and the squares of the calculated reactive power of the diesel generator is obtained, and the apparent power of the diesel generator is obtained from the square root of the sum.

[0042] Optionally, the short-time overload capacity calculation module 320 is further adapted to: The short-time overload capacity is calculated based on the ratio of the maximum reactive power of the electrical load during group start-up or self-starting to the short-time overload coefficient of the diesel generator.

[0043] Optionally, the selected capacity of the diesel generator includes the selected rated active power and the selected rated apparent power of the diesel generator; Selecting module 330 is further adapted to: The rated active power of the diesel generator is determined based on the calculated active power of the diesel generator, wherein the selected rated active power of the diesel generator is greater than the calculated active power of the diesel generator. The rated apparent power of the diesel generator is determined based on the calculated apparent power and short-time overload capacity of the diesel generator. The selected rated apparent power of the diesel generator is greater than the calculated apparent power of the diesel generator, and the selected rated apparent power of the diesel generator is greater than the short-time overload capacity.

[0044] Optionally, the voltage drop calculation module 340 is further adapted to: The maximum load voltage drop during diesel generator startup is calculated based on the transient reactance, subtransient reactance, maximum active power of electrical load during group startup or self-starting, and the selected rated active power of the diesel generator.

[0045] Optionally, the target determination module 350 is further adapted to: The criteria for determining the capacity of a diesel generator are as follows: the selected rated apparent power of the diesel generator is greater than the calculated apparent power of the diesel generator, the selected rated apparent power of the diesel generator is greater than the short-time overload capacity, the selected rated active power of the diesel generator is greater than the calculated active power of the diesel generator, and the maximum load voltage drop of the diesel generator at startup is less than or equal to a preset threshold. If so, the target capacity of the diesel generator is determined based on the selected capacity of the diesel generator and the maximum load voltage drop during diesel generator startup.

[0046] The descriptions of the above modules refer to the corresponding descriptions in the method embodiments, and will not be repeated here.

[0047] This invention also provides a non-volatile computer storage medium storing at least one executable instruction that can perform the operation corresponding to the calculation method for selecting diesel generator capacity based on the demand factor method in any of the above method embodiments.

[0048] This application provides a computer program product, which includes at least one executable instruction or computer program that enables a processor to perform the operation corresponding to the calculation method for selecting diesel generator capacity based on the demand factor method in any of the above method embodiments.

[0049] Figure 4 The diagram illustrates the structure of a computing device according to an embodiment of the present invention. The specific embodiments of the present invention do not limit the specific implementation of the computing device.

[0050] like Figure 4 As shown, the computing device may include: a processor 402, a communication interface 404, a memory 406, and a communication bus 408.

[0051] in: The processor 402, communication interface 404, and memory 406 communicate with each other via communication bus 408.

[0052] Communication interface 404 is used to communicate with other network elements such as clients or other servers.

[0053] The processor 402 is used to execute program 410, specifically the relevant steps in the above-described embodiment of the calculation method for selecting diesel generator capacity based on the demand factor method.

[0054] Specifically, program 410 may include program code that includes computer operation instructions.

[0055] Processor 402 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The computing device includes one or more processors, which may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0056] Memory 406 is used to store program 410. Memory 406 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0057] Specifically, program 410 can be used to cause processor 402 to execute the calculation method for selecting diesel generator capacity based on the demand factor method in any of the above method embodiments. The specific implementation of each step in program 410 can be found in the corresponding descriptions of the steps and units in the above-described calculation embodiments for selecting diesel generator capacity based on the demand factor method, and will not be repeated here. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the devices and modules described above can be referred to the corresponding process descriptions in the foregoing method embodiments, and will not be repeated here.

[0058] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used in conjunction with the teachings herein. The required structure for constructing such systems is apparent from the above description. Furthermore, the embodiments of the present invention are not directed to any particular programming language. It should be understood that the embodiments of the present invention described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing preferred embodiments of the present invention.

[0059] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0060] Similarly, it should be understood that, in order to streamline the embodiments of the invention and aid in understanding one or more of the various inventive aspects, features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof in the above description of exemplary embodiments of the invention. However, this disclosure should not be construed as reflecting an intention that the claimed embodiments of the invention require more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0061] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0062] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0063] The various component embodiments of the present invention can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Those skilled in the art will understand that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some or all of the components according to the embodiments of the present invention. The embodiments of the present invention can also be implemented as device or apparatus programs (e.g., computer programs and computer program products) for performing part or all of the methods described herein. Such programs implementing the embodiments of the present invention can be stored on a computer-readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0064] It should be noted that the above embodiments are illustrative of the present invention and not restrictive of the invention, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Embodiments of the present invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A calculation method for selecting diesel generator capacity based on the demand factor method, characterized in that, The diesel generator includes a continuously operating electric motor unit or a diesel generator unit, and the method includes: The demand factor and power factor tangent are determined based on the electrical load of the same type, and the calculated active power and calculated apparent power of the diesel generator are calculated; the power factor tangent is determined based on the power factor. Determine the short-time overload capacity based on the maximum reactive power of the electrical load during group startup or self-starting; The selected capacity of the diesel generator is determined according to the calculated active power, calculated apparent power, and short-time overload capacity of the diesel generator, based on a preset first condition. Based on the selected capacity of the diesel generator, the maximum load voltage drop at startup of the diesel generator is calculated. The target capacity of the diesel generator is determined based on the preset second condition, the selected capacity of the diesel generator, and the maximum load voltage drop at startup of the diesel generator.

2. The method according to claim 1, characterized in that, The process of determining the demand factor and power factor tangent based on similar types of electrical loads, and calculating the calculated active power and calculated apparent power of the diesel generator, further includes: The demand factor and power factor are determined based on the electrical load of the same type, and the power factor tangent is determined based on the power factor. The active power of the diesel generator is calculated by multiplying the demand factor and the sum of the rated power of similar electrical loads. The calculated reactive power of the diesel generator is obtained by multiplying the calculated active power of the diesel generator and the tangent of the power factor angle. The sum of the square of the calculated active power and the square of the calculated reactive power of the diesel generator is calculated, and the apparent power of the diesel generator is obtained from the square root of the sum.

3. The method according to claim 1, characterized in that, The determination of short-time overload capacity based on the maximum reactive power of the electrical load during group startup or self-starting further includes: The short-time overload capacity is calculated based on the ratio of the maximum reactive power of the electrical load during group start-up or self-starting to the short-time overload coefficient of the diesel generator.

4. The method according to claim 1, characterized in that, The selected capacity of the diesel generator includes the selected rated active power and the selected rated apparent power of the diesel generator. The step of determining the selected capacity of the diesel generator according to the calculated active power, calculated apparent power, and short-time overload capacity of the diesel generator based on a preset first condition further includes: The rated active power of the diesel generator is determined based on the calculated active power of the diesel generator, wherein the selected rated active power of the diesel generator is greater than the calculated active power of the diesel generator. The rated apparent power of the diesel generator is determined based on the calculated apparent power of the diesel generator and the short-time overload capacity, wherein the selected rated apparent power of the diesel generator is greater than the calculated apparent power of the diesel generator, and the selected rated apparent power of the diesel generator is greater than the short-time overload capacity.

5. The method according to claim 4, characterized in that, The step of calculating the maximum starting load voltage drop of the diesel generator based on the selected capacity of the diesel generator further includes: The maximum load voltage drop of the diesel generator during startup is calculated based on the transient reactance of the diesel generator, the subtransient reactance of the diesel generator, the maximum active power of the electrical load during group startup or self-starting, and the rated active power of the selected diesel generator.

6. The method according to any one of claims 1-5, characterized in that, The step of determining the target capacity of the diesel generator based on the preset second condition, the selected capacity of the diesel generator, and the maximum load voltage drop at startup of the diesel generator further includes: The determination is made based on whether the selected capacity of the diesel generator is greater than the calculated apparent power of the diesel generator and greater than the short-time overload capacity, and whether the selected rated active power of the diesel generator is greater than the calculated active power of the diesel generator, and whether the maximum load voltage drop of the diesel generator at startup is less than or equal to a preset threshold. If so, the target capacity of the diesel generator is determined based on the selected capacity of the diesel generator and the maximum load voltage drop at startup of the diesel generator.

7. A calculation device for selecting the capacity of a diesel generator based on the demand factor method, characterized in that, The diesel generator includes a continuously operating electric motor unit or a diesel generator unit, and the device includes: The power calculation module is suitable for determining the demand factor and power factor tangent value based on electrical loads of the same type, and for calculating the calculated active power and calculated apparent power of the diesel generator; the power factor tangent value is determined based on the power factor. The short-time overload capacity calculation module is suitable for determining the short-time overload capacity based on the maximum reactive power of the electrical load during group startup or self-starting. The selection module is adapted to determine the selected capacity of the diesel generator according to the calculated active power, calculated apparent power and short-time overload capacity of the diesel generator based on a preset first condition. The voltage drop calculation module is adapted to calculate the maximum load voltage drop of the diesel generator based on the selected capacity of the diesel generator. The target determination module is adapted to determine the target capacity of the diesel generator based on a preset second condition, the selected capacity of the diesel generator, and the maximum load voltage drop at startup of the diesel generator.

8. A computing device, characterized in that, include: The processor, memory, communication interface, and communication bus are provided, wherein the processor, memory, and communication interface communicate with each other via the communication bus. The memory is used to store at least one executable instruction that causes the processor to perform the operation corresponding to the calculation method for selecting diesel generator capacity based on the demand factor method as described in any one of claims 1-6.

9. A computer storage medium, characterized in that, The storage medium stores at least one executable instruction that causes the processor to perform the operation corresponding to the calculation method for selecting diesel generator capacity based on the demand factor method as described in any one of claims 1-6.

10. A computer program product, characterized in that, It includes at least one executable instruction that causes the processor to perform the operation corresponding to the calculation method for selecting diesel generator capacity based on the demand factor method as described in any one of claims 1-6.

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