Method and device for testing adaptability of photovoltaic power station to new energy power transmission system

Abstract

The application relates to a photovoltaic power station access new energy power transmission system adaptability test method, device and equipment, the method comprises the following steps: acquiring the electrical distance between each photovoltaic power station and the sending end converter station, sorting all photovoltaic power stations in the sending end new energy power grid according to the electrical distance to obtain a photovoltaic power station set; according to the sorting of the photovoltaic power station set, the photovoltaic power station is controlled to run one by one, and the alternating voltage of each node of the sending end new energy power grid is acquired; whether the alternating voltage of each node meets the operation condition is judged one by one, if it meets, whether the sending end new energy power grid exists oscillation is judged according to the alternating voltage of the node corresponding to the photovoltaic power station operation; if there is no oscillation, the adaptability test of the photovoltaic power station is completed; if there is oscillation, the photovoltaic power station is locked and an oscillation list is generated. The method realizes the adaptability test of the photovoltaic power station access new energy power transmission system, so that the photovoltaic power station access new energy power transmission system can stably run.

Description

Technical Field

[0001] This application relates to the field of new energy power transmission technology, and in particular to an adaptability testing method, apparatus and equipment for photovoltaic power stations to connect to new energy power transmission systems. Background Technology

[0002] The plateau region is rich in solar energy resources. With the construction of new power systems, the penetration rate of new energy sources is gradually increasing, and the photovoltaic resources in the plateau region are gradually being developed on a large scale. Through the new energy transmission system, the abundant photovoltaic resources in the plateau region are transmitted to the load center of the eastern power transmission.

[0003] Due to the large scale and dispersed distribution of photovoltaic (PV) power generation units in plateau regions, long transmission lines exist between PV power plant clusters at the sending end of new energy transmission systems, and other conventional power sources are relatively small in scale, all of which differ from the characteristics of existing new energy transmission scenarios. For large-scale PV integration into transmission systems, ensuring the stable operation of the transmission system is crucial. Therefore, it is necessary to test the adaptability of PV power generation units in the transmission system under application scenarios. Currently, there are no conditions for on-site testing of the adaptability of PV power generation units in new energy transmission systems. Summary of the Invention

[0004] This application provides a method, apparatus, and equipment for adaptability testing of photovoltaic power plants connected to new energy transmission systems, which solves the technical problem that there is no existing method for on-site testing of the adaptability of photovoltaic power generation units in new energy transmission systems.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] A method for adaptability testing of photovoltaic (PV) power plants connected to a renewable energy transmission system, wherein the PV power plant connected to the renewable energy transmission system includes a sending-end renewable energy grid, an outgoing flexible DC transmission system, and a receiving-end grid connected in sequence. The outgoing flexible DC transmission system includes a sending-end converter station, a receiving-end converter station, and a straight line connecting the sending-end converter station and the receiving-end converter station. The sending-end renewable energy grid includes several PV power plants with PV power generation units. The method for adaptability testing of PV power plants connected to the renewable energy transmission system includes the following steps:

[0007] S10. Obtain the electrical distance between each photovoltaic power station and the sending-end converter station, and sort all photovoltaic power stations in the sending-end new energy grid according to the electrical distance to obtain the sorted photovoltaic power station set;

[0008] S20. Control the operation of the photovoltaic power stations one by one according to the order of the photovoltaic power station set, and obtain the AC voltage of each node of the sending end new energy grid;

[0009] S30. Based on the operation of the photovoltaic power station, determine whether the AC voltage of each corresponding node meets the operating conditions. If it does, determine whether there is oscillation in the sending-end renewable energy grid based on the AC voltage of the node corresponding to the operation of the photovoltaic power station. If there is no oscillation in the sending-end renewable energy grid, complete the adaptability test of the photovoltaic power station. If there is oscillation in the sending-end renewable energy grid, lock the photovoltaic power station and generate an oscillation list.

[0010] Preferably, the adaptability test method for connecting the photovoltaic power station to the new energy transmission system includes: conducting adaptability tests on all the photovoltaic power stations in the photovoltaic power station cluster according to steps S20 and S30.

[0011] Preferably, the adaptability test method for connecting the photovoltaic power station to the new energy transmission system includes: if the AC voltage of each node does not meet the operating conditions, adjusting the output level of the photovoltaic power station corresponding to the AC voltage so that the AC voltage of each node of the sending-end new energy grid corresponding to the adjusted operation of the photovoltaic power station meets the operating conditions.

[0012] Preferably, the operating condition is the allowable operating voltage for the sending-end renewable energy grid.

[0013] Preferably, sorting all photovoltaic power stations in the sending-end new energy grid according to the electrical distance to obtain the sorted photovoltaic power station set includes: sorting all photovoltaic power stations in the sending-end new energy grid according to the electrical distance from near to far to obtain the sorted photovoltaic power station set.

[0014] This application also provides an adaptability testing device for photovoltaic power plants connected to a new energy transmission system. The photovoltaic power plant connected to the new energy transmission system includes a sending-end new energy grid, an outgoing flexible DC transmission system, and a receiving-end grid connected in sequence. The outgoing flexible DC transmission system includes a sending-end converter station, a receiving-end converter station, and a straight line connecting the sending-end converter station and the receiving-end converter station. The sending-end new energy grid includes several photovoltaic power plants with photovoltaic power generation units. The adaptability testing device for photovoltaic power plants connected to the new energy transmission system includes a sorting module, a data acquisition module, and a test judgment module.

[0015] The sorting module is used to obtain the electrical distance between each photovoltaic power station and the sending-end converter station, and sort all photovoltaic power stations in the sending-end new energy grid according to the electrical distance to obtain a sorted set of photovoltaic power stations;

[0016] The data acquisition module is used to control the operation of the photovoltaic power stations one by one according to the order of the photovoltaic power station set, and to acquire the AC voltage of each node of the sending-end new energy grid.

[0017] The test judgment module is used to determine whether the AC voltage of each corresponding node meets the operating conditions according to the operation of the photovoltaic power station. If it does, it determines whether there is oscillation in the sending-end renewable energy grid based on the AC voltage of the node corresponding to the operation of the photovoltaic power station. If there is no oscillation in the sending-end renewable energy grid, the adaptability test of the photovoltaic power station is completed. If there is oscillation in the sending-end renewable energy grid, the photovoltaic power station is locked and an oscillation list is generated.

[0018] Preferably, the test judgment module is further configured to adjust the output level of the photovoltaic power station corresponding to the AC voltage of each node if the AC voltage of each node does not meet the operating conditions, so that the AC voltage of each node of the sending-end new energy grid corresponding to the adjusted operation of the photovoltaic power station meets the operating conditions.

[0019] Preferably, the sorting module is further configured to sort all photovoltaic power stations in the sending-end new energy grid from near to far according to the electrical distance, so as to obtain a sorted set of photovoltaic power stations.

[0020] This application also provides a storage device storing a plurality of program codes adapted to be loaded and run by a processor to perform the above-described adaptability test method for connecting a photovoltaic power station to a new energy transmission system.

[0021] This application also provides a terminal device, including a processor and a memory;

[0022] The memory is used to store program code and transmit the program code to the processor;

[0023] The processor is used to execute the above-described adaptability test method for connecting photovoltaic power plants to new energy transmission systems according to the instructions in the program code.

[0024] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: the adaptability test method, device and equipment for photovoltaic power stations to access new energy transmission systems, the photovoltaic power station access to new energy transmission systems includes a sending-end new energy grid, a sending flexible DC transmission system and a receiving-end grid connected in sequence, the sending flexible DC transmission system includes a sending-end converter station, a receiving-end converter station and a straight line connecting the sending-end converter station and the receiving-end converter station, the sending-end new energy grid includes several photovoltaic power stations with photovoltaic power generation units. This method includes obtaining the electrical distance between each photovoltaic (PV) power station and the sending-end converter station; sorting all PV power stations in the sending-end renewable energy grid according to the electrical distance to obtain a sorted PV power station set; controlling the operation of each PV power station according to the sorting of the PV power station set to obtain the AC voltage of each node in the sending-end renewable energy grid; determining whether the AC voltage of each node corresponding to the operation of each PV power station meets the operating conditions; if it does, determining whether there is oscillation in the sending-end renewable energy grid based on the AC voltage of the node corresponding to the operation of that PV power station; if there is no oscillation in the sending-end renewable energy grid, completing the adaptability test of that PV power station; if there is oscillation in the sending-end renewable energy grid, locking the PV power station and generating an oscillation list. This adaptability test method for PV power stations connected to renewable energy transmission systems enables the stable operation of PV power stations connected to renewable energy transmission systems after passing the test, solving the technical problem of the lack of an existing method for on-site testing of the adaptability of PV power generation units in renewable energy transmission systems. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a flowchart illustrating the steps of the adaptability testing method for connecting a photovoltaic power station to a new energy transmission system as described in the embodiments of this application.

[0027] Figure 2 This is a framework diagram of the photovoltaic power station connecting to the new energy transmission system in the adaptability test method for connecting a photovoltaic power station to the new energy transmission system described in the embodiments of this application;

[0028] Figure 3 This is a framework diagram of the adaptability testing device for connecting a photovoltaic power station to a new energy transmission system, as described in an embodiment of this application. Detailed Implementation

[0029] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] This application provides a method, apparatus, and equipment for adaptability testing of photovoltaic power plants connected to new energy transmission systems, which solves the technical problem that there is no existing method for on-site testing of the adaptability of photovoltaic power generation units in new energy transmission systems.

[0031] Example 1:

[0032] Figure 1 This is a flowchart illustrating the steps of the adaptability testing method for connecting a photovoltaic power station to a new energy transmission system as described in the embodiments of this application. Figure 2 This is a framework diagram of the photovoltaic power station connecting to the new energy transmission system in the adaptability test method for connecting a photovoltaic power station to the new energy transmission system described in the embodiments of this application.

[0033] like Figure 2 As shown in the embodiment of this application, an adaptability test method for photovoltaic power plants connected to a new energy transmission system is provided. The photovoltaic power plant connected to the new energy transmission system includes a sending-end new energy grid 10, a sending flexible DC transmission system 20, and a receiving-end grid 30 connected in sequence. The sending flexible DC transmission system includes a sending-end converter station, a receiving-end converter station, and a straight line connecting the sending-end converter station and the receiving-end converter station. The sending-end new energy grid includes several photovoltaic power plants with photovoltaic power generation units.

[0034] It should be noted that the sending-end renewable energy grid is constructed according to the actual planning, with long transmission lines between each pair of photovoltaic power stations, each line being tens of kilometers in length. These lines cause uneven voltage distribution among the photovoltaic power stations, posing problems for grid connection of their photovoltaic power generation units. The connection of this photovoltaic power station to the renewable energy transmission system can be simulated in real-time using the RTDS simulation platform to obtain a simulation model. In the simulation model of the photovoltaic power station connected to the renewable energy transmission system, the sending flexible DC transmission system and the photovoltaic power generation units of the photovoltaic power station adopt typical system topologies and control structures. The sending-end converter station uses VF control, the receiving-end converter station uses UDC-Q control, and the photovoltaic power generation units adopt classic grid-connected dual-loop control. The photovoltaic power station is modeled using the power weighting method and the equal-loss method. The sending-end renewable energy grid lines are constructed using the Bergeron model based on the actual structure.

[0035] like Figure 1As shown, the adaptability test method for connecting the photovoltaic power station to the new energy transmission system includes the following steps:

[0036] S10. Obtain the electrical distance between each photovoltaic power station and the sending-end converter station, sort all photovoltaic power stations in the sending-end new energy grid according to the electrical distance, and obtain the sorted photovoltaic power station set.

[0037] It should be noted that in step S10, firstly, the electrical distance between each photovoltaic power station connected to the new energy transmission system and the sending-end converter station is obtained; secondly, all photovoltaic power stations are sorted according to the electrical distance to obtain a set of photovoltaic power stations.

[0038] Furthermore, all photovoltaic power stations in the sending-end renewable energy grid are sorted according to their electrical distance to obtain a sorted set of photovoltaic power stations.

[0039] S20. Control the operation of each photovoltaic power station according to the order of the photovoltaic power station set, and obtain the AC voltage of each node of the sending-end new energy grid.

[0040] It should be noted that in step S20, the photovoltaic power stations are unlocked one by one from the first photovoltaic power station according to the order of the photovoltaic power station set (i.e., the operation of the photovoltaic power stations is controlled). For each photovoltaic power station unlocked, the AC voltage of each node of the sending-end new energy grid is obtained.

[0041] S30. Based on the operation of the photovoltaic power station, determine whether the AC voltage of each corresponding node meets the operating conditions. If it does, determine whether there is oscillation in the sending-end renewable energy grid based on the AC voltage of the node corresponding to the operation of the photovoltaic power station. If there is no oscillation in the sending-end renewable energy grid, complete the adaptability test of the photovoltaic power station. If there is oscillation in the sending-end renewable energy grid, lock out the photovoltaic power station and generate an oscillation list.

[0042] It should be noted that in step S30, each time the AC voltage of each node in the sending-end renewable energy grid is acquired, the AC voltage of each node is checked to see if it meets the operating conditions. Only if the AC voltage of each node meets the operating conditions is the sending-end renewable energy grid again checked for oscillations. If the result is that the sending-end renewable energy grid does not oscillate, the adaptability test of unlocking a photovoltaic power station is completed; if the sending-end renewable energy grid oscillates, the photovoltaic power station is locked and an oscillation list is generated. In this embodiment, determining whether the sending-end renewable energy grid is oscillating through AC voltage is a relatively mature technology in the industry and will not be described in detail here, such as loss of synchronization or periodic oscillations. The operating conditions refer to the allowable operating voltage of the sending-end renewable energy grid. The AC voltage of each node meeting the operating conditions means that the AC voltage is within the allowable operating voltage range.

[0043] In this embodiment of the application, after completing the adaptability test of the photovoltaic power station connected to the new energy transmission system, a model that can output an oscillation list is obtained, and the operation status of the photovoltaic power station connected to the new energy transmission system can be known through the oscillation list.

[0044] Furthermore, the adaptability test method for connecting the photovoltaic power station to the new energy transmission system includes: if the AC voltage of each node does not meet the operating conditions, adjusting the output level of the photovoltaic power station corresponding to the AC voltage so that the AC voltage of each node of the sending-end new energy grid corresponding to the adjusted operation of the photovoltaic power station meets the operating conditions.

[0045] It should be noted that adjusting the output level of the photovoltaic power station corresponding to the AC voltage refers to adjusting the active and reactive power of the photovoltaic power station so that the AC voltage of each node of the sending-end renewable energy grid is kept within the allowable operating voltage range, which is 0.97pu to 1.07pu, where pu is the per-unit voltage value of the sending-end renewable energy grid.

[0046] Furthermore, the adaptability test method for connecting the photovoltaic power station to the new energy transmission system includes: if there is oscillation in the sending-end new energy grid, the photovoltaic power station is locked out and the number of the photovoltaic power station is recorded.

[0047] It should be noted that the adaptability test method for connecting the photovoltaic power station to the new energy transmission system can record the adaptability problems of the photovoltaic power generation unit during the operation of the photovoltaic power station connected to the new energy transmission system by using the number of the photovoltaic power station whose instability is caused by the oscillation record of the sending end new energy grid. This provides technical support for further research on adjusting the parameters of the photovoltaic power station connected to the new energy transmission system to solve the adaptability problems.

[0048] This application provides an adaptability testing method for photovoltaic (PV) power plants connected to a renewable energy transmission system. The PV power plant connection to the renewable energy transmission system includes a sending-end renewable energy grid, an outgoing flexible DC transmission system, and a receiving-end grid connected sequentially. The outgoing flexible DC transmission system includes a sending-end converter station, a receiving-end converter station, and a straight line connecting the sending-end and receiving-end converter stations. The sending-end renewable energy grid includes several PV power plants with PV power generation units. The method includes: obtaining the electrical distance between each PV power plant and the sending-end converter station; sorting all PV power plants in the sending-end renewable energy grid according to the electrical distance to obtain a sorted set of PV power plants; controlling the operation of each PV power plant according to the sorting of the PV power plant set to obtain the AC voltage of each node in the sending-end renewable energy grid; determining whether the AC voltage of each node meets the operating conditions based on the operation of each PV power plant; if it does, determining whether there is oscillation in the sending-end renewable energy grid based on the AC voltage of the node corresponding to the operation of that PV power plant; if there is no oscillation in the sending-end renewable energy grid, completing the adaptability test of the PV power plant; if there is oscillation in the sending-end renewable energy grid, locking the PV power plant and generating an oscillation list. This method for adaptability testing of photovoltaic power stations connected to new energy transmission systems enables the stable operation of photovoltaic power stations connected to new energy transmission systems, solving the technical problem that there is currently no way to conduct on-site testing of the adaptability of photovoltaic power generation units to new energy transmission systems.

[0049] In one embodiment of this application, the adaptability testing method for connecting the photovoltaic power station to the new energy transmission system includes: conducting adaptability testing on all photovoltaic power stations in the photovoltaic power station according to steps S20 and S30.

[0050] It should be noted that the adaptability test method for photovoltaic power stations connected to the new energy transmission system completes the adaptability test for all photovoltaic power stations in the sending-end new energy grid through steps S20 and S30.

[0051] Example 2:

[0052] Figure 3 This is a framework diagram of an adaptability testing device for connecting a photovoltaic power station to a new energy transmission system, according to an embodiment of this application.

[0053] like Figure 3As shown in the figure, this application embodiment also provides an adaptability testing device for photovoltaic power stations connected to new energy transmission systems. The photovoltaic power station connected to the new energy transmission system includes a sending-end new energy grid, a sending flexible DC transmission system, and a receiving-end grid connected in sequence. The sending flexible DC transmission system includes a sending-end converter station, a receiving-end converter station, and a straight line connecting the sending-end converter station and the receiving-end converter station. The sending-end new energy grid includes several photovoltaic power stations with photovoltaic power generation units. The adaptability testing device for photovoltaic power stations connected to new energy transmission systems includes a sorting module 100, a data acquisition module 200, and a test judgment module 300.

[0054] The sorting module 100 is used to obtain the electrical distance between each photovoltaic power station and the sending-end converter station, and sort all photovoltaic power stations in the sending-end new energy grid according to the electrical distance to obtain the sorted photovoltaic power station set;

[0055] The data acquisition module 200 is used to control the operation of photovoltaic power stations one by one according to the order of the photovoltaic power station set, and to acquire the AC voltage of each node of the sending-end new energy grid.

[0056] The test judgment module 300 is used to determine whether the AC voltage of each node corresponding to the photovoltaic power station meets the operating conditions. If it does, it determines whether there is oscillation in the sending-end renewable energy grid based on the AC voltage of the node corresponding to the operation of the photovoltaic power station. If there is no oscillation in the sending-end renewable energy grid, the adaptability test of the photovoltaic power station is completed. If there is oscillation in the sending-end renewable energy grid, the photovoltaic power station is locked and an oscillation list is generated.

[0057] In this embodiment of the application, the test judgment module 300 is further configured to adjust the output level of the photovoltaic power station corresponding to the AC voltage of each node if the AC voltage of each node does not meet the operating conditions, so that the AC voltage of each node of the sending-end new energy grid corresponding to the adjusted operation of the photovoltaic power station meets the operating conditions.

[0058] In this embodiment of the application, the sorting module 100 is further used to sort all photovoltaic power stations in the sending-end new energy grid from near to far according to electrical distance, so as to obtain a sorted set of photovoltaic power stations.

[0059] It should be noted that the modules in the device of Embodiment 2 correspond to the steps in the method of Embodiment 1. The content of the adaptability test method for connecting the photovoltaic power station to the new energy transmission system has been described in detail in Embodiment 1. Therefore, the content of the modules in the device will not be described in detail in Embodiment 2.

[0060] Example 3:

[0061] This application provides a storage device that stores multiple lines of program code, which are adapted to be loaded and run by a processor to perform the above-described adaptability test method for connecting a photovoltaic power station to a new energy transmission system.

[0062] Example 4:

[0063] This application provides a terminal device, including a processor and a memory;

[0064] Memory is used to store program code and transfer the program code to the processor;

[0065] The processor is used to execute the above-mentioned adaptability test method for connecting photovoltaic power plants to new energy transmission systems according to the instructions in the program code.

[0066] It should be noted that the processor is used to execute the steps in the above-described embodiment of an adaptability testing method for connecting a photovoltaic power station to a new energy transmission system according to the instructions in the program code. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the above-described system / device embodiments.

[0067] For example, a computer program can be divided into one or more modules / units, one or more of which are stored in memory and executed by a processor to complete this application. One or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in a terminal device.

[0068] Terminal devices can be computing devices such as desktop computers, laptops, handheld computers, and cloud servers. Terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will understand that this does not constitute a limitation on the terminal device, which may include more or fewer components than illustrated, or combinations of certain components, or different components. For example, a terminal device may also include input / output devices, network access devices, buses, etc.

[0069] The processor referred to can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0070] Memory can be an internal storage unit of a terminal device, such as a hard drive or RAM. Memory can also be an external storage device, such as a plug-in hard drive, SmartMedia Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, memory can include both internal and external storage units. Memory is used to store computer programs and other programs and data required by the terminal device. Memory can also be used for temporary storage of data that has been output or will be output.

[0071] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0072] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0073] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0074] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0075] If the integrated unit is implemented as 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 technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0076] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An adaptability testing method for connecting a photovoltaic power station to a new energy transmission system, wherein the photovoltaic power station connecting to the new energy transmission system includes a sending-end new energy grid, an outgoing flexible DC transmission system, and a receiving-end grid connected in sequence, the outgoing flexible DC transmission system includes a sending-end converter station, a receiving-end converter station, and a straight line connecting the sending-end converter station and the receiving-end converter station, and the sending-end new energy grid includes several photovoltaic power stations with photovoltaic power generation units, characterized in that, The adaptability testing method for connecting the photovoltaic power station to the new energy transmission system includes the following steps: S10. Obtain the electrical distance between each photovoltaic power station and the sending-end converter station, and sort all photovoltaic power stations in the sending-end new energy grid according to the electrical distance to obtain the sorted photovoltaic power station set; S20. Control the operation of the photovoltaic power stations one by one according to the order of the photovoltaic power station set, and obtain the AC voltage of each node of the sending end new energy grid; S30. Based on the operation of the photovoltaic power station, determine whether the AC voltage of each corresponding node meets the operating conditions. If it does, determine whether there is oscillation in the sending-end renewable energy grid based on the AC voltage of the node corresponding to the operation of the photovoltaic power station. If there is no oscillation in the sending-end renewable energy grid, complete the adaptability test of the photovoltaic power station. If there is oscillation in the sending-end renewable energy grid, lock the photovoltaic power station and generate an oscillation list. Adaptability tests are conducted on all photovoltaic power stations in the photovoltaic power station cluster according to steps S20 and S30.

2. The adaptability testing method for photovoltaic power plants connected to new energy transmission systems according to claim 1, characterized in that, include: If the AC voltage at each node does not meet the operating conditions, the output level of the photovoltaic power station corresponding to that AC voltage is adjusted so that the AC voltage at each node of the sending-end new energy grid corresponding to the adjusted operation of the photovoltaic power station meets the operating conditions.

3. The adaptability testing method for photovoltaic power plants connected to new energy transmission systems according to claim 1, characterized in that, The operating conditions are the allowable operating voltages for the sending-end renewable energy grid.

4. The adaptability testing method for photovoltaic power plants connected to new energy transmission systems according to claim 1, characterized in that, The photovoltaic power stations in the sending-end new energy grid are sorted according to the electrical distance to obtain the sorted photovoltaic power station set.

5. An adaptability testing device for photovoltaic power plants connected to a new energy transmission system, wherein the photovoltaic power plant connected to the new energy transmission system includes a sending-end new energy grid, an outgoing flexible DC transmission system, and a receiving-end grid connected in sequence, the outgoing flexible DC transmission system includes a sending-end converter station, a receiving-end converter station, and a straight line connecting the sending-end converter station and the receiving-end converter station, and the sending-end new energy grid includes several photovoltaic power plants with photovoltaic power generation units, characterized in that, The adaptability testing device for photovoltaic power stations to connect to new energy transmission systems includes a sorting module, a data acquisition module, and a test judgment module. The sorting module is used to obtain the electrical distance between each photovoltaic power station and the sending-end converter station, and sort all photovoltaic power stations in the sending-end new energy grid according to the electrical distance to obtain a sorted set of photovoltaic power stations; The data acquisition module is used to control the operation of the photovoltaic power stations one by one according to the order of the photovoltaic power station set, and to acquire the AC voltage of each node of the sending-end new energy grid. The test judgment module is used to determine whether the AC voltage of each corresponding node meets the operating conditions according to the operation of the photovoltaic power station. If it does, it determines whether there is oscillation in the sending-end renewable energy grid based on the AC voltage of the node corresponding to the operation of the photovoltaic power station. If there is no oscillation in the sending-end renewable energy grid, the adaptability test of the photovoltaic power station is completed. If there is oscillation in the sending-end renewable energy grid, the photovoltaic power station is locked and an oscillation list is generated. The test and judgment module is also used to adjust the output level of the photovoltaic power station corresponding to the AC voltage of each node if the AC voltage of each node does not meet the operating conditions, so that the AC voltage of each node of the sending-end new energy grid corresponding to the adjusted operation of the photovoltaic power station meets the operating conditions.

6. The adaptability testing device for photovoltaic power plants connected to new energy transmission systems according to claim 5, characterized in that, The sorting module is also used to sort all photovoltaic power stations in the sending-end new energy grid from near to far according to the electrical distance, so as to obtain a sorted set of photovoltaic power stations.

7. A storage device storing a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by a processor to perform the adaptability test method for connecting photovoltaic power plants to new energy transmission systems as described in any one of claims 1-4.

8. A terminal device, characterized in that, Including the processor and memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the adaptability test method for connecting a photovoltaic power station to a new energy transmission system as described in any one of claims 1-4, according to the instructions in the program code.

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