New energy delivery system static voltage stability limit calculation method and related device

Abstract

The invention provides a static voltage stability limit calculation method of a new energy transmission system and a related device. The static voltage stability limit calculation method comprises the following steps: adjusting direct current side capacitance of a new energy converter of the new energy transmission system to a set value; adjusting the new energy active power of the new energy delivery system to an initial value; based on the set value and the initial value, performing AC line short-circuit-free N-1 on-off fault scanning on the new energy transmission system; judging whether the system is stable; if yes, new energy active power is increased on the basis of the initial value, and fault scanning is carried out again; and if not, taking the new energy active power at the moment as the static voltage stability limit of the new energy delivery system. According to the method, the direct current side capacitance of the new energy converter is adjusted to the set value, so that the control of the new energy on the direct current voltage can be considered when the static voltage stability limit of the new energy sending-out system is calculated, and the static voltage stability limit of the new energy sending-out system can be calculated more quickly and more accurately.

Description

Technical Field

[0001] The present invention belongs to the technical field of power grid planning and operation of electric power systems, and specifically relates to a static voltage stability limit calculation method and related devices for a new energy transmission system. Background Art

[0002] Recently, it is necessary to vigorously develop renewable energy such as wind power and solar energy to replace traditional fossil fuels. A large number of new energy power generation facilities have been deployed in southern my country, with a total installed capacity of 150 million kilowatts. It is expected that about 130 million kilowatts of installed capacity will be added in the next three years. Most of the newly added new energy bases are located in areas far away from the load center, and electricity needs to be transmitted to the demand side through long-distance transmission lines.

[0003] Especially in places where new energy sources are concentrated, such as the southern region, power transmission needs to rely on long-distance AC transmission lines. However, when evaluating the performance of such large-scale new energy output systems, especially considering the key indicator of static voltage stability, existing planning and operation analysis face challenges. Usually, the maximum transmission capacity under the static voltage stability limit is an important consideration, which can be calculated through electromechanical simulation. However, in order to ensure stability during the simulation process, current electromechanical simulation software often sets the DC side capacitance of the new energy converter to a theoretical infinite value. Although this method simplifies the simulation process, it ignores the dynamic regulation of the DC voltage by the new energy system in practice, resulting in the calculated static voltage stability limit being higher than the actual situation, and the simulation takes a long time, which cannot provide timely and accurate data support for grid planners and operators. Therefore, how to improve the simulation accuracy and efficiency has become an urgent problem to be solved. Summary of the invention

[0004] In view of this, the present invention provides a method and device for calculating the static voltage stability limit of a new energy transmission system. By adjusting the DC side capacitance of the new energy converter, the control of the new energy on the DC voltage can be taken into account when calculating the static voltage stability limit of the new energy transmission system, so that the static voltage stability limit of the new energy transmission system can be calculated faster and more accurately.

[0005] In order to achieve the above object, the technical solution provided by the present invention is as follows:

[0006] In a first aspect, the present invention provides a method for calculating a static voltage stability limit of a new energy transmission system, comprising the following steps:

[0007] Adjust the DC side capacitance of the new energy converter of the new energy transmission system to the set value;

[0008] Adjust the new energy active power of the new energy transmission system to the initial value;

[0009] Based on the set value and initial value, the AC line of the new energy transmission system is scanned for N-1 short-circuit breaking faults;

[0010] Determine whether the system is stable;

[0011] If yes, then increase the new energy active power based on the initial value and re-perform the fault scan;

[0012] If not, the active power of the renewable energy at this time is used as the static voltage stability limit of the renewable energy transmission system.

[0013] Furthermore, the initial value is calculated as follows:

[0014] Pi=Sn*i%

[0015] In the formula, Pi is the active power value of the new energy, Sn is the capacity of the new energy itself, and i% is the set ratio.

[0016] Furthermore, the active power of new energy is increased on the basis of the initial value, including:

[0017] Increase the active power of renewable energy according to the set step size, and set the step size to 1%.

[0018] Furthermore, after adding the new energy active power on the basis of the initial value and re-performing the fault scan, it also includes:

[0019] It is determined whether the set ratio reaches 100%. If so, it is determined that the static voltage stability limit of the renewable energy transmission system is greater than the renewable energy installed capacity.

[0020] In a second aspect, the present invention provides a device for calculating a static voltage stability limit of a new energy transmission system, comprising:

[0021] A first parameter setting module, used to adjust the DC side capacitance of the new energy converter of the new energy transmission system to a set value;

[0022] The second parameter setting module is used to adjust the new energy active power of the new energy transmission system to an initial value; and is also used to increase the new energy active power on the basis of the initial value when the system is judged to be stable;

[0023] The fault scanning module is used to scan the AC line non-short-circuit N-1 disconnection fault of the renewable energy transmission system based on the set value and the initial value; it is also used to re-scan the fault after the renewable energy active power increases;

[0024] A judgment module, used to judge whether the system is stable after each fault scan, if so, enter the second parameter setting module, if not, enter the determination unit;

[0025] The determination unit is used to use the active power of the renewable energy when the system is unstable as the static voltage stability limit of the renewable energy transmission system.

[0026] Furthermore, the initial value is calculated as follows:

[0027]

[0028] In the formula, is the active power value of new energy, For the capacity of new energy itself, To set the ratio.

[0029] Furthermore, the active power of new energy is increased on the basis of the initial value, including:

[0030] Increase the active power of renewable energy according to the set step size, and set the step size to 1%.

[0031] Furthermore, after adding the new energy active power on the basis of the initial value and re-performing the fault scan, it also includes:

[0032] It is determined whether the set ratio reaches 100%. If so, it is determined that the static voltage stability limit of the renewable energy transmission system is greater than the renewable energy installed capacity.

[0033] In a third aspect, the present invention provides a computer device, the device comprising a processor and a memory:

[0034] The memory is used to store the computer program and send the instructions of the computer program to the processor;

[0035] The processor executes a method for calculating a static voltage stability limit of a new energy transmission system according to the instructions of the computer program as described in the first aspect.

[0036] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for calculating the static voltage stability limit of a new energy transmission system as in the first aspect.

[0037] In summary, the present invention provides a method and related device for calculating the static voltage stability limit of a new energy transmission system, including adjusting the DC side capacitance of a new energy converter of the new energy transmission system to a set value; adjusting the new energy active power of the new energy transmission system to an initial value; based on the set value and the initial value, performing an N-1 disconnection fault scan of the AC line without short circuit on the new energy transmission system; judging whether the system is stable; if so, increasing the new energy active power on the basis of the initial value, and re-performing the fault scan; if not, using the new energy active power at this time as the static voltage stability limit of the new energy transmission system. The present invention adjusts the DC side capacitance of the new energy converter to a set value, so that the control of the new energy on the DC voltage can be considered when calculating the static voltage stability limit of the new energy transmission system, and the static voltage stability limit of the new energy transmission system can be calculated faster and more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A flowchart of a method for calculating a static voltage stability limit of a new energy transmission system provided by an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of a new energy delivery system provided by the present invention;

[0041] Figure 3 When i=90, the voltage diagram of the new energy generator terminal after the transmission line is disconnected without short circuit N-1 fault is provided in the embodiment of the present invention;

[0042] Figure 4 When i=90, the transmission line has no short circuit N-1 breaking fault and the new energy active current diagram is provided in the embodiment of the present invention;

[0043] Figure 5 When i=91, the voltage diagram of the new energy generator terminal after the N-1 disconnection fault without short circuit in the transmission line is provided in the embodiment of the present invention;

[0044] Figure 6 When i=91, the active current diagram of new energy after the N-1 disconnection fault without short circuit in the transmission line is provided in the embodiment of the present invention;

[0045] Figure 7 A block diagram of a static voltage stability limit calculation device for a new energy transmission system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] See also Figure 1 and 2 , Figure 1 The present invention shows a process of calculating the static voltage stability limit of a new energy transmission system; Figure 2 A new energy delivery system is shown.

[0048] The following first combines Figure 2 The problems existing in the existing calculation method of static voltage stability limit are introduced.

[0049] Figure 2 In the example, the electricity generated by renewable energy is transmitted to the receiving system through two transmission lines (transmission line 1 and transmission line 2). The receiving system includes a generator and a grounding device.

[0050] In the traditional electromechanical simulation process, in order to ensure the stability of the simulation, it is often assumed that the DC side capacitance of the new energy converter is infinite. This means that the simulation model ignores the dynamic changes of the DC voltage in the actual system and its impact on the stability of the system. This assumption makes the calculated static voltage stability limit higher than the actual situation, which may lead to an overestimation result.

[0051] Due to the use of overly simplified models, although certain results can be obtained, these results may not be accurate. In addition, such simulation processes often take a long time and cannot meet the needs of rapid decision-making. For power grid planners and operators, what they need is a method that can obtain reliable data in a short time in order to make timely and effective decisions.

[0052] Due to the above reasons, existing simulation methods may give inaccurate results. This not only affects the correct evaluation of system performance, but may also lead to wrong investment decisions and technology choices. Especially with the rapid growth of renewable energy installed capacity, the risks brought by this inaccuracy are more significant.

[0053] Based on this, the present invention provides a method and device for calculating the static voltage stability limit of a new energy transmission system. The following is an introduction to an embodiment of a method for calculating the static voltage stability limit of a new energy transmission system of the present invention.

[0054] This embodiment provides a method for calculating the static voltage stability limit of a new energy transmission system, comprising the following steps:

[0055] Step 1: Adjust the DC side capacitance of the new energy converter of the new energy transmission system to the set value.

[0056] It should be noted that the new energy converter is used to convert the electric energy generated by new energy (such as wind energy and solar energy) into a device suitable for grid transmission, usually involving the conversion of DC to AC. The DC side capacitor is a capacitor used to stabilize the DC voltage in the converter. It can smooth the DC side voltage fluctuations and prevent voltage mutations from causing damage to the equipment.

[0057] In this step, you need to set a reasonable DC link capacitance value. This setting should reflect the actual capacitance size instead of considering it as infinite, so as to be closer to the behavior of the actual system.

[0058] Step 2: Adjust the active power of the new energy sent out of the new energy system to the initial value.

[0059] It should be noted that the active power of new energy refers to the actual power transmitted by the new energy power generation system to the power grid. It is useful working energy and can be used to drive motors or other loads.

[0060] This step sets the active power generated by the renewable energy to an initial level, which can be based on experience or the result of the previous calculation. This is to determine a starting point for subsequent simulations.

[0061] Step 3: Based on the set value and initial value, perform an AC line short-circuit N-1 breaking fault scan on the renewable energy transmission system.

[0062] It should be noted that the non-short circuit N-1 breaking fault scan is a simulation test that checks the system response when a line in the system breaks. The N-1 principle means that the system should remain stable in the event of any single component failure.

[0063] In this step, the system behavior is simulated when experiencing a single component failure for a specific DC link capacitance value and active power level. This helps to identify potential stability issues.

[0064] Step 4: Determine whether the system is stable.

[0065] It should be noted that this step checks whether the system can maintain its static voltage stability under the fault conditions of step 3. If the system can remain stable, it means that the current configuration is feasible.

[0066] Step 5: If yes, then increase the new energy active power based on the initial value and perform fault scanning again.

[0067] It should be noted that if the system remains stable after the active power of renewable energy is increased, then continue to increase the power and repeat the previous fault scan until the critical point of the system is found.

[0068] Step 6: If not, the active power of the renewable energy at this time is used as the static voltage stability limit of the renewable energy transmission system.

[0069] It should be noted that once the system is found to become unstable after the active power is increased, the previously stable highest power value is the static voltage stability limit of the system.

[0070] The present invention provides a method for calculating the static voltage stability limit of a new energy transmission system, which gradually increases the active power of the new energy and checks the stability of the system after each increase, and finally determines the static voltage stability limit of the system. By setting the actual DC side capacitance value, this method is closer to the actual system behavior, thereby improving the accuracy of the simulation results.

[0071] Compared with the traditional simulation method, the calculation method provided in this embodiment can more accurately determine the static voltage stability limit value because it takes into account the real dynamic regulation effect of the DC side capacitor. Through the successive approximation method, the boundary of system stability can be determined more accurately.

[0072] Figure 1 1 is a flow chart of a method for calculating the static voltage stability limit of a new energy transmission system proposed in combination with the above-mentioned embodiment. Figure 1 Other embodiments of the present invention are introduced.

[0073] In one embodiment, the initial value is calculated as follows:

[0074] Pi=Sn*i%

[0075] In the formula, Pi is the active power value of the new energy, Sn is the capacity of the new energy itself, and i% is the set ratio.

[0076] In a further embodiment, increasing the new energy active power based on the initial value includes:

[0077] Increase the active power of renewable energy according to the set step size, and set the step size to 1%.

[0078] In this embodiment, after each fault scan is completed and it is confirmed that the system is still stable, the active power of the new energy source will increase by 1% of its own capacity, and then the next round of fault scan will be performed, that is, i=i+1.

[0079] In one embodiment, after adding the new energy active power on the basis of the initial value and re-performing the fault scan, the method further includes:

[0080] It is determined whether the set ratio reaches 100%. If so, it is determined that the static voltage stability limit of the renewable energy transmission system is greater than the renewable energy installed capacity.

[0081] In this embodiment, if the set ratio reaches 100%, it means that even if the new energy system fully outputs its installed capacity, the system can still maintain static voltage stability. In this case, it can be determined that the static voltage stability limit of the new energy delivery system is greater than the new energy installed capacity.

[0082] The calculation method of the present invention is introduced below with a calculation example. Figure 2 The calculation is performed on the renewable energy transmission system shown in the figure. In this example, the renewable energy installed capacity is 4 million kilowatts and the transmission line length is 110 km. The calculation based on this data includes:

[0083] 1. Adjust the DC side capacitance C of the new energy converter in the study area to C=50mF.

[0084] 2. Adjust the active power Pi of new energy in the study area to i% of its own capacity Sn. In this example, Sn=5 million kilowatts and the initial value of i is 0.

[0085] 3. Perform a scan of the AC line without short circuit N-1 breaking faults in the studied area. The scanning result of this example is stable, i=i+1.

[0086] 4. In this example, when i=91, the system begins to become unstable.

[0087] In this example, when i=90, the voltage and active current at the terminal of the new energy generator after the N-1 disconnection fault without short circuit in the transmission line are as follows Figure 3 and Figure 4 As shown; in this example, when i=91, the voltage and active current at the terminal of the new energy generator after the N-1 disconnection fault without short circuit in the transmission line are as follows Figure 5 and Figure 6 shown.

[0088] 5. Obtain the static voltage stability limit of the renewable energy transmission system.

[0089] The static voltage stability limit of the renewable energy transmission system in this example is 3.6 million kilowatts, and the simulation time is 6 to 10 seconds. In the conventional method, the DC side capacitance C of the renewable energy converter is infinite. When the renewable energy output is 4 million kilowatts (new energy installed capacity), the simulation time is 100 seconds, and there is no static voltage instability. The calculation time is long and inaccurate.

[0090] The present invention proposes a method for calculating the static voltage stability limit of a new energy transmission system. The method is characterized in that by adjusting the DC side capacitance of the new energy converter, the control of the new energy on the DC voltage can be taken into account when calculating the static voltage stability limit of the new energy transmission system, and the static voltage stability limit of the new energy transmission system can be calculated faster and more accurately.

[0091] Based on the same inventive concept, the embodiment of the present application also provides a new energy transmission system static voltage stability limit calculation device for implementing the above-mentioned new energy transmission system static voltage stability limit calculation method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in the embodiment of the new energy transmission system static voltage stability limit calculation device provided below can refer to the limitations of the new energy transmission system static voltage stability limit calculation method in the above text, and will not be repeated here.

[0092] See also Figure 7 The embodiment of the present invention provides a static voltage stability limit calculation device for a new energy transmission system, comprising:

[0093] A first parameter setting module, used to adjust the DC side capacitance of the new energy converter of the new energy transmission system to a set value;

[0094] The second parameter setting module is used to adjust the new energy active power of the new energy transmission system to an initial value; and is also used to increase the new energy active power on the basis of the initial value when the system is judged to be stable;

[0095] The fault scanning module is used to scan the AC line non-short-circuit N-1 disconnection fault of the renewable energy transmission system based on the set value and the initial value; it is also used to re-scan the fault after the renewable energy active power increases;

[0096] A judgment module, used to judge whether the system is stable after each fault scan, if so, enter the second parameter setting module, if not, enter the determination unit;

[0097] The determination unit is used to use the active power of the renewable energy when the system is unstable as the static voltage stability limit of the renewable energy transmission system.

[0098] In one embodiment, the initial value is calculated as follows:

[0099]

[0100] In the formula, is the active power value of new energy, For the capacity of new energy itself, To set the ratio.

[0101] In one embodiment, increasing the new energy active power based on the initial value includes:

[0102] Increase the active power of renewable energy according to the set step size, and set the step size to 1%.

[0103] In one embodiment, after the new energy active power is increased on the basis of the initial value and the fault scan is performed again, the method further includes:

[0104] It is determined whether the set ratio reaches 100%. If so, it is determined that the static voltage stability limit of the renewable energy transmission system is greater than the renewable energy installed capacity.

[0105] 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 practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit 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.

[0106] An embodiment of the present invention also provides a computer device, including: a memory and a processor and a computer program stored in the memory. When the computer program is executed on the processor, the static voltage stability limit calculation method of the new energy transmission system described in any one of the above methods is implemented.

[0107] The computer device may be a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The computer device may include, but is not limited to, a processor and a memory.

[0108] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0109] In some embodiments, the memory may be an internal storage unit of the computer device, such as a hard disk or memory of the computer device. In other embodiments, the memory may also be an external storage device of the computer device, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the computer device. Further, the memory may include both an internal storage unit and an external storage device of the computer device. The memory is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as the program code of the computer program. The memory may also be used to temporarily store data that has been output or is to be output.

[0110] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for calculating the static voltage stability limit of a new energy transmission system as described in any one of the above methods is implemented.

[0111] In this embodiment, if the integrated 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, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various method embodiments can be implemented. 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 can at least include: any entity or device that can carry the computer program code to the camera / terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. For example, USB flash drive, mobile hard disk, disk or optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0112] 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.

[0113] 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.

[0114] In the embodiments disclosed in the present application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0115] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those 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. However, these 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 invention.

Claims

1. A method for calculating the static voltage stability limit of a new energy transmission system, characterized in that: The steps include: Adjust the DC side capacitance of the new energy converter of the new energy transmission system to the set value; Adjusting the new energy active power of the new energy transmission system to an initial value; Based on the set value and the initial value, performing an AC line non-short circuit N-1 disconnection fault scan on the new energy delivery system; Determining whether the new energy delivery system is stable; If yes, then increase the active power of the new energy source based on the initial value and perform fault scanning again; If not, the new energy active power at this time is used as the static voltage stability limit of the new energy transmission system.

2. The method for calculating the static voltage stability limit of a new energy transmission system according to claim 1 is characterized in that: The initial value is calculated according to the following formula: Pi=Sn*i% In the formula, Pi is the active power value of the new energy, Sn is the capacity of the new energy itself, and i% is the set ratio.

3. The method for calculating the static voltage stability limit of a new energy transmission system according to claim 2 is characterized in that: Increasing the new energy active power on the basis of the initial value comprises: The active power of the new energy is increased according to a set step size, and the set step size is 1%.

4. The method for calculating the static voltage stability limit of a new energy transmission system according to claim 2 is characterized in that: After increasing the new energy active power on the basis of the initial value and re-performing fault scanning, the method further includes: It is determined whether the set ratio reaches 100%. If so, it is determined that the static voltage stability limit of the new energy transmission system is greater than the new energy installed capacity.

5. A static voltage stability limit calculation device for a new energy transmission system, characterized in that: include: A first parameter setting module, used to adjust the DC side capacitance of the new energy converter of the new energy transmission system to a set value; A second parameter setting module, used for adjusting the new energy active power of the new energy transmission system to an initial value; It is also used to increase the active power of the new energy source based on the initial value when the system is judged to be stable; A fault scanning module, used for performing an AC line non-short circuit N-1 disconnection fault scanning on the new energy delivery system based on the set value and the initial value; It is also used to re-perform fault scanning after the active power of the new energy source increases; A judgment module, used for judging whether the new energy delivery system is stable after each fault scan, and if so, entering the second parameter setting module, and if not, entering the determination unit; The determination unit is used to use the active power of the new energy when the system is unstable as the static voltage stability limit of the new energy transmission system.

6. The static voltage stability limit calculation device for a new energy transmission system according to claim 5 is characterized in that: The initial value is calculated according to the following formula: In the formula, is the active power value of new energy, For the capacity of new energy itself, To set the ratio.

7. The static voltage stability limit calculation device for a new energy transmission system according to claim 6 is characterized in that: Increasing the new energy active power on the basis of the initial value comprises: The active power of the new energy is increased according to a set step size, and the set step size is 1%.

8. The static voltage stability limit calculation device for a new energy transmission system according to claim 6 is characterized in that: After increasing the new energy active power on the basis of the initial value and re-performing fault scanning, the method further includes: It is determined whether the set ratio reaches 100%. If so, it is determined that the static voltage stability limit of the new energy transmission system is greater than the new energy installed capacity.

9. A computer device, characterized in that: The device comprises a processor and a memory: The memory is used to store a computer program and send instructions of the computer program to the processor; The processor executes a method for calculating a static voltage stability limit of a new energy transmission system according to any one of claims 1 to 4 according to instructions of the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for calculating the static voltage stability limit of a new energy transmission system according to any one of claims 1 to 4 is implemented.

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