Method and device for adjusting transient inertia margin of photovoltaic power station connected with grid through synchronous machine

Abstract

The embodiment of the invention provides a transient inertia margin adjusting method and device for a photovoltaic power station connected with a grid through a synchronous machine, and the method comprises the steps: determining a transient inertia margin improvement index, and measuring the related parameters of the transient inertia margin improvement index; determining influence factors based on the related parameters; predicting the transient inertia margin improvement index based on the influence factor, and determining a predicted value; and adjusting the transient inertia margin of the photovoltaic power station based on the predicted value. According to the method for improving the transient inertia margin of the photovoltaic power station connected with the grid through the synchronous machine, the operation strategy of the photovoltaic power station connected with the grid through the synchronous machine can be adjusted according to the prediction result of the transient inertia margin improvement index when the power system is subjected to external disturbance. And the waste of energy resources is reduced, the possibility of instability or unstable oscillation of the system is reduced, the safe and stable operation of the power system is ensured, and the popularization and application of renewable energy sources are further promoted.

Description

Technical Field

[0001] The embodiments of the present specification relate to the field of electric power technology, and in particular to a method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine. Background Art

[0002] Traditional fossil energy can hardly meet the needs of social development. The proportion of new energy in the power system is constantly increasing, and photovoltaic power generation has gradually become a mainstream green energy. Combining photovoltaic power generation systems with existing power systems is the key to achieving large-scale photovoltaic energy utilization.

[0003] Photovoltaic power generation is different from traditional power generation. It lacks the inertia required for system operation. It is connected to the grid through the inverter. The photovoltaic power generation is connected to the grid through the synchronous machine at the same time, which can make the photovoltaic power station more flexible and adaptable, and can better cope with grid failures, changes and demand fluctuations. At the same time, it also promotes the large-scale use of renewable energy. After the photovoltaic power station is connected to the power system through the synchronous machine, when it is subject to external disturbances, the operation of the power system changes, and it becomes more difficult to judge the inertia margin of the photovoltaic power station, which affects the dispatching and operation of the power system.

[0004] Therefore, a better solution is urgently needed. Summary of the invention

[0005] In view of this, the embodiments of this specification provide a method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine. One or more embodiments of this specification also relate to a device for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine, a computing device, a computer-readable storage medium, and a computer program to solve the technical defects existing in the prior art.

[0006] According to a first aspect of an embodiment of this specification, a method for adjusting a transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine is provided, comprising:

[0007] Determine the transient inertia margin improvement index and measure the relevant parameters of the transient inertia margin improvement index;

[0008] Determine the impact factor based on the relevant parameters;

[0009] Predict the transient inertia margin improvement index based on the influencing factors and determine the predicted value;

[0010] The transient inertia margin of the photovoltaic power station is adjusted based on the predicted value.

[0011] In a possible implementation, determining the transient inertia margin improvement index includes:

[0012] Determine the interval time, power parameters and output parameters;

[0013] The transient inertia margin improvement index is determined based on the interval time, power parameters and output parameters.

[0014] In a possible implementation, the parameters related to the transient inertia margin improvement index are measured, including:

[0015] Based on measuring relevant parameters of the transient inertia margin improvement index at interval moments, relevant parameters at multiple moments are determined.

[0016] In a possible implementation, based on measuring relevant parameters of the transient inertia margin improvement index at intervals, relevant parameters at multiple moments are determined, including:

[0017] Determine the target parameters based on the transient inertia margin improvement index;

[0018] Determine the time series values ​​of the target parameter at multiple moments;

[0019] Determine relevant parameters based on the time series values.

[0020] In a possible implementation, determining the impact factor based on relevant parameters includes:

[0021] Normalizing relevant parameters to determine normalized data;

[0022] The impact factor is determined based on the normalized data and the impact factor calculation formula.

[0023] In a possible implementation, the transient inertia margin improvement index is predicted based on the influencing factor to determine the predicted value, including:

[0024] The transient inertia margin improvement index is predicted based on the influencing factors and prediction rules to determine the predicted value.

[0025] In a possible implementation, adjusting the transient inertia margin of the photovoltaic power station based on the predicted value includes:

[0026] When the predicted value is less than the first threshold, determining a first adjustment parameter, and adjusting the transient inertia margin based on the first adjustment parameter;

[0027] When the predicted value is less than or equal to the second threshold value and greater than or equal to the first threshold value, determining a second adjustment parameter, and adjusting the transient inertia margin based on the second adjustment parameter;

[0028] When the predicted value is greater than the second threshold, a third adjustment parameter is determined, and the transient inertia margin is adjusted based on the third adjustment parameter.

[0029] According to a second aspect of the embodiments of this specification, there is provided a transient inertia margin adjustment device for a photovoltaic power station connected to the grid via a synchronous machine, comprising:

[0030] A parameter determination module is configured to determine a transient inertia margin improvement index and measure related parameters of the transient inertia margin improvement index;

[0031] an impact determination module configured to determine an impact factor based on relevant parameters;

[0032] A prediction module is configured to predict the transient inertia margin improvement index based on the influencing factor and determine a prediction value;

[0033] The adjustment module is configured to adjust the transient inertia margin of the photovoltaic power station based on the predicted value.

[0034] According to a third aspect of an embodiment of this specification, a computing device is provided, including:

[0035] Memory and processor;

[0036] The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the transient inertia margin adjustment method of the photovoltaic power station connected to the grid via a synchronous machine are implemented.

[0037] According to a fourth aspect of the embodiments of this specification, a computer-readable storage medium is provided, which stores computer-executable instructions, which, when executed by a processor, implement the steps of the above-mentioned method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine.

[0038] According to a fifth aspect of the embodiments of this specification, a computer program is provided, wherein when the computer program is executed in a computer, the computer is caused to execute the steps of the above-mentioned method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine.

[0039] The embodiments of this specification provide a method and device for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine, wherein the method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine includes: determining a transient inertia margin improvement index, measuring relevant parameters of the transient inertia margin improvement index; determining an influencing factor based on the relevant parameters; predicting the transient inertia margin improvement index based on the influencing factor and determining a predicted value; and adjusting the transient inertia margin of the photovoltaic power station based on the predicted value. The method for improving the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine of the embodiments of this specification can adjust the operating strategy of the photovoltaic station connected to the grid via a synchronous machine according to the predicted result of the transient inertia margin improvement index when the power system is subjected to external disturbances. Reduce the waste of energy resources, reduce the possibility of instability or unstable oscillation in the system, ensure the safe and stable operation of the power system, and further promote the popularization and application of renewable energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a flow chart of a method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine provided by an embodiment of this specification;

[0041] Figure 2 It is a structural schematic diagram of a transient inertia margin adjustment device for a photovoltaic power station connected to the grid via a synchronous machine provided by an embodiment of this specification;

[0042] Figure 3 It is a structural block diagram of a computing device provided by an embodiment of this specification. DETAILED DESCRIPTION

[0043] Many specific details are described in the following description to facilitate a full understanding of this specification. However, this specification can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of this specification, so this specification is not limited to the specific implementation disclosed below.

[0044] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms of "a" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0045] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0046] In this specification, a method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine is provided. This specification also relates to a device for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine, a computing device, and a computer-readable storage medium, which are described in detail one by one in the following embodiments.

[0047] See also Figure 1 , Figure 1 A flow chart of a method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine according to an embodiment of the present specification is shown, which specifically includes the following steps.

[0048] Step 101: Determine a transient inertia margin improvement index, and measure relevant parameters of the transient inertia margin improvement index.

[0049] In a possible implementation, determining the transient inertia margin improvement index includes: determining an interval time, a power parameter, and an output parameter; and determining the transient inertia margin improvement index based on the interval time, the power parameter, and the output parameter.

[0050] In practical applications, the transient inertia margin improvement index σ of a photovoltaic power station connected to the grid via a synchronous machine is defined as mg , as shown in formula (1):

[0051]

[0052] In the formula, t 1 ,t 2 ,...,t k ,...,t n is a fixed time interval of n moments, where n is a natural number, n∈1,2,···, k is the kth moment, k is a natural number, and k∈{1,2,···n}; t k The output of the photovoltaic power station at all times; t k The output of the time synchronization machine; t k The charging and discharging power of the photovoltaic power station energy storage equipment at the moment; f pv,min and f pv,max are the minimum and maximum output of the photovoltaic power station respectively; f PM,min and f PM,max are the minimum and maximum output of the synchronous machine respectively; Q pv,min and Q pv,max They are the minimum and maximum charging and discharging power of the photovoltaic power station energy storage equipment, respectively.

[0053] In a possible implementation, measuring the relevant parameters of the transient inertia margin improvement index includes: measuring the relevant parameters of the transient inertia margin improvement index at intervals, and determining the relevant parameters at multiple moments.

[0054] Specifically, based on measuring relevant parameters of the transient inertia margin improvement index at intervals, relevant parameters at multiple moments are determined, including: determining target parameters based on the transient inertia margin improvement index; determining time series values ​​of the target parameters at multiple moments; and determining relevant parameters based on the time series values.

[0055] In practical applications, the relevant parameters of the transient inertia margin improvement index of the photovoltaic power station connected to the synchronous machine are measured, and the time series of the relevant parameters of the transient inertia margin improvement index of the photovoltaic power station connected to the synchronous machine is established according to the measured values ​​as shown in formula (2):

[0056]

[0057] Step 102: Determine the impact factor based on the relevant parameters.

[0058] In a possible implementation, determining the impact factor based on the relevant parameters includes: normalizing the relevant parameters to determine normalized data; and determining the impact factor based on the normalized data and an impact factor calculation formula.

[0059] In practical applications, the measured data of the parameters related to the transient inertia margin improvement index of the photovoltaic power station connected to the synchronous machine are normalized, as shown in formula (3):

[0060]

[0061] In the formula, t k Normalized value of photovoltaic power station output at any moment; t k Normalized value of the time synchronization machine output; t k The normalized value of the charging and discharging power of the photovoltaic power station energy storage equipment at the moment; f pv,min and f pv,max are the minimum and maximum output of the photovoltaic power station respectively; f PM,min and f PM,max are the minimum and maximum output of the synchronous machine respectively; Q pv,min and Q pv,max They are respectively the minimum and maximum values ​​of the charging and discharging power of the photovoltaic power station energy storage equipment.

[0062] Furthermore, the influence factor of the historical data of the transient inertia margin improvement index related parameters of the photovoltaic power station connected to the synchronous machine on the transient inertia margin improvement index related parameters of the photovoltaic power station connected to the synchronous machine at the next moment is calculated as shown in formula (4):

[0063]

[0064] In the formula, It is the influence factor of the output measurement data of the photovoltaic power station on the transient inertia margin improvement index of the photovoltaic power station connected to the grid via the synchronous machine at the next moment; It is the influence factor of synchronous machine output measurement data on the transient inertia margin improvement index of the photovoltaic power station connected to the grid via the synchronous machine at the next moment; It is the influence factor of the charging and discharging power measurement data of the photovoltaic power station energy storage equipment on the transient inertia margin improvement index of the photovoltaic power station connected to the grid through the synchronous machine at the next moment.

[0065] Step 103: Predict the transient inertia margin improvement index based on the influencing factor and determine a predicted value.

[0066] In a possible implementation, predicting the transient inertia margin improvement index based on the influencing factor and determining the predicted value includes: predicting the transient inertia margin improvement index based on the influencing factor and a prediction rule and determining the predicted value.

[0067] In practical applications, the predicted value of the transient inertia margin improvement index of the photovoltaic power station connected to the grid via the synchronous machine at the next moment is calculated as shown in formula (5):

[0068]

[0069] Step 104: adjusting the transient inertia margin of the photovoltaic power station based on the predicted value.

[0070] In a possible implementation, the transient inertia margin of the photovoltaic power station is adjusted based on the predicted value, including: when the predicted value is less than a first threshold, determining a first adjustment parameter, and adjusting the transient inertia margin based on the first adjustment parameter; when the predicted value is less than or equal to a second threshold and greater than or equal to the first threshold, determining a second adjustment parameter, and adjusting the transient inertia margin based on the second adjustment parameter; when the predicted value is greater than the second threshold, determining a third adjustment parameter, and adjusting the transient inertia margin based on the third adjustment parameter.

[0071] In practical applications, the operation of the photovoltaic power station is adjusted according to the predicted value of the transient inertia margin improvement index of the photovoltaic power station connected to the grid by the synchronous machine at the next moment: if the transient inertia margin improvement index σ of the photovoltaic power station connected to the grid by the synchronous machine at the next moment tno >0.622, it is considered that the transient inertia margin of the photovoltaic power station at the next moment is large, and there may be potential waste of resources. At this time, the charging and discharging power of the photovoltaic power station energy storage equipment should be appropriately increased to reduce the output of the synchronous machine; if the transient inertia margin of the photovoltaic power station connected to the grid by the synchronous machine at the next moment is increased by tno <0.414, it is considered that the transient inertia margin of the photovoltaic power station at the next moment is small, and the system's ability to cope with disturbances and maintain stability during the transient process is weak. At this time, the output of the synchronous machine should be appropriately increased to improve the transient stability of the system; if the transient inertia margin improvement index of the photovoltaic power station connected to the grid by the synchronous machine at the next moment is 0.414≤σ tno ≤0.622, it is considered that the system has an appropriate transient inertia margin at the next moment and can maintain normal operation.

[0072] The embodiments of this specification provide a method and device for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine, wherein the method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine includes: determining a transient inertia margin improvement index, measuring relevant parameters of the transient inertia margin improvement index; determining an influencing factor based on the relevant parameters; predicting the transient inertia margin improvement index based on the influencing factor and determining a predicted value; and adjusting the transient inertia margin of the photovoltaic power station based on the predicted value. The method for improving the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine of the embodiments of this specification can adjust the operating strategy of the photovoltaic station connected to the grid via a synchronous machine according to the predicted result of the transient inertia margin improvement index when the power system is subjected to external disturbances. Reduce the waste of energy resources, reduce the possibility of instability or unstable oscillation in the system, ensure the safe and stable operation of the power system, and further promote the popularization and application of renewable energy.

[0073] Corresponding to the above method embodiment, this specification also provides an embodiment of a transient inertia margin adjustment device for a photovoltaic power station connected to the grid via a synchronous machine. Figure 2 FIG. 1 shows a schematic diagram of a structure of a transient inertia margin adjustment device for a photovoltaic power station connected to the grid via a synchronous machine provided by an embodiment of the present specification. Figure 2 As shown, the device comprises:

[0074] The parameter determination module 201 is configured to determine a transient inertia margin improvement index and measure relevant parameters of the transient inertia margin improvement index;

[0075] An impact determination module 202, configured to determine an impact factor based on relevant parameters;

[0076] The prediction module 203 is configured to predict the transient inertia margin improvement index based on the influencing factor and determine a prediction value;

[0077] The adjustment module 204 is configured to adjust the transient inertia margin of the photovoltaic power station based on the predicted value.

[0078] In a possible implementation, determining the transient inertia margin improvement index includes:

[0079] Determine the interval time, power parameters and output parameters;

[0080] The transient inertia margin improvement index is determined based on the interval time, power parameters and output parameters.

[0081] In a possible implementation, the parameters related to the transient inertia margin improvement index are measured, including:

[0082] Based on measuring relevant parameters of the transient inertia margin improvement index at interval moments, relevant parameters at multiple moments are determined.

[0083] In a possible implementation, based on measuring relevant parameters of the transient inertia margin improvement index at intervals, relevant parameters at multiple moments are determined, including:

[0084] Determine the target parameters based on the transient inertia margin improvement index;

[0085] Determine the time series values ​​of the target parameter at multiple moments;

[0086] Determine relevant parameters based on the time series values.

[0087] In a possible implementation, determining the impact factor based on relevant parameters includes:

[0088] Normalizing relevant parameters to determine normalized data;

[0089] The impact factor is determined based on the normalized data and the impact factor calculation formula.

[0090] In a possible implementation, the transient inertia margin improvement index is predicted based on the influencing factor to determine the predicted value, including:

[0091] The transient inertia margin improvement index is predicted based on the influencing factors and prediction rules to determine the predicted value.

[0092] In a possible implementation, adjusting the transient inertia margin of the photovoltaic power station based on the predicted value includes:

[0093] When the predicted value is less than the first threshold, determining a first adjustment parameter, and adjusting the transient inertia margin based on the first adjustment parameter;

[0094] When the predicted value is less than or equal to the second threshold value and greater than or equal to the first threshold value, determining a second adjustment parameter, and adjusting the transient inertia margin based on the second adjustment parameter;

[0095] When the predicted value is greater than the second threshold, a third adjustment parameter is determined, and the transient inertia margin is adjusted based on the third adjustment parameter.

[0096] The embodiments of this specification provide a method and device for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine, wherein the device for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine includes: determining a transient inertia margin improvement index, measuring relevant parameters of the transient inertia margin improvement index; determining an influencing factor based on the relevant parameters; predicting the transient inertia margin improvement index based on the influencing factor and determining a predicted value; and adjusting the transient inertia margin of the photovoltaic power station based on the predicted value. The method for improving the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine of the embodiments of this specification can adjust the operating strategy of the photovoltaic station connected to the grid via a synchronous machine according to the predicted result of the transient inertia margin improvement index when the power system is subjected to external disturbances. Reduce the waste of energy resources, reduce the possibility of instability or unstable oscillation in the system, ensure the safe and stable operation of the power system, and further promote the popularization and application of renewable energy.

[0097] The above is a schematic scheme of a transient inertia margin adjustment device for a photovoltaic power station connected to the grid via a synchronous machine in this embodiment. It should be noted that the technical scheme of the transient inertia margin adjustment device for a photovoltaic power station connected to the grid via a synchronous machine and the technical scheme of the transient inertia margin adjustment method for a photovoltaic power station connected to the grid via a synchronous machine belong to the same concept, and the details of the technical scheme of the transient inertia margin adjustment device for a photovoltaic power station connected to the grid via a synchronous machine that are not described in detail can all be referred to the description of the technical scheme of the transient inertia margin adjustment method for a photovoltaic power station connected to the grid via a synchronous machine.

[0098] Figure 3 The block diagram of a computing device 300 according to an embodiment of the present specification is shown. The components of the computing device 300 include but are not limited to a memory 310 and a processor 320. The processor 320 is connected to the memory 310 via a bus 330, and the database 350 is used to store data.

[0099] The computing device 300 also includes an access device 340 that enables the computing device 300 to communicate via one or more networks 360. Examples of these networks include a public switched telephone network (PSTN), a local area network (LAN), a wide area network (WAN), a personal area network (PAN), or a combination of communication networks such as the Internet. The access device 340 may include one or more of any type of network interface (e.g., a network interface card (NIC)) that is wired or wireless, such as an IEEE 802.11 wireless local area network (WLAN) wireless interface, a world-wide interoperability for microwave access (Wi-MAX) interface, an Ethernet interface, a universal serial bus (USB) interface, a cellular network interface, a Bluetooth interface, and a near field communication (NFC).

[0100] In one embodiment of the present specification, the above components of the computing device 300 and Figure 3 Other components not shown in the figure may also be connected to each other, for example, via a bus. It should be understood that Figure 3 The computing device structure block diagram shown is only for the purpose of illustration, and is not intended to limit the scope of this specification. Those skilled in the art can add or replace other components as needed.

[0101] The computing device 300 may be any type of stationary or mobile computing device, including a mobile computer or mobile computing device (e.g., a tablet computer, a personal digital assistant, a laptop computer, a notebook computer, a netbook, etc.), a mobile phone (e.g., a smart phone), a wearable computing device (e.g., a smart watch, smart glasses, etc.), or other types of mobile devices, or a stationary computing device such as a desktop computer or a personal computer (PC). The computing device 300 may also be a mobile or stationary server.

[0102] The processor 320 is used to execute the following computer executable instructions, which, when executed by the processor, implement the steps of the above-mentioned method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid by a synchronous machine. The above is a schematic scheme of a computing device of this embodiment. It should be noted that the technical scheme of the computing device and the technical scheme of the above-mentioned method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid by a synchronous machine belong to the same concept. For the details not described in detail in the technical scheme of the computing device, please refer to the description of the technical scheme of the above-mentioned method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid by a synchronous machine.

[0103] An embodiment of the present specification further provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the above-mentioned method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine.

[0104] The above is a schematic scheme of a computer-readable storage medium of this embodiment. It should be noted that the technical scheme of the storage medium and the technical scheme of the above-mentioned method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine belong to the same concept, and the details not described in detail in the technical scheme of the storage medium can be referred to the description of the technical scheme of the above-mentioned method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine.

[0105] An embodiment of the present specification further provides a computer program, wherein when the computer program is executed in a computer, the computer is instructed to execute the steps of the above-mentioned method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine.

[0106] The above is a schematic scheme of a computer program of this embodiment. It should be noted that the technical scheme of the computer program and the technical scheme of the above-mentioned method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine belong to the same concept, and the details not described in detail in the technical scheme of the computer program can be referred to the description of the technical scheme of the above-mentioned method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine.

[0107] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0108] The computer instructions include computer program codes, which may be in source code form, object code form, executable files or some intermediate forms, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0109] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of this specification are not limited by the order of the actions described, because according to the embodiments of this specification, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the embodiments of this specification.

[0110] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0111] The preferred embodiments of this specification disclosed above are only used to help explain this specification. The optional embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the embodiments of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the embodiments of this specification, so that technicians in the relevant technical field can well understand and use this specification. This specification is only limited by the claims and their full scope and equivalents.

Claims

1. A method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine, characterized in that: include: Determining a transient inertia margin improvement index, and measuring relevant parameters of the transient inertia margin improvement index; Determining an impact factor based on the relevant parameters; Predicting the transient inertia margin improvement index based on the influencing factor to determine a predicted value; The transient inertia margin of the photovoltaic power station is adjusted based on the predicted value.

2. The method according to claim 1, characterized in that The step of determining the transient inertia margin improvement index comprises: Determine the interval time, power parameters and output parameters; A transient inertia margin improvement index is determined based on the interval time, the power parameter, and the output parameter.

3. The method according to claim 1, characterized in that The parameters related to measuring the transient inertia margin improvement index include: Based on measuring relevant parameters of the transient inertia margin improvement index at intervals, relevant parameters at multiple moments are determined.

4. The method according to claim 3, characterized in that The step of measuring the relevant parameters of the transient inertia margin improvement index at intervals to determine the relevant parameters at multiple moments includes: determining a target parameter based on the transient inertia margin improvement index; Determining a time series value of the target parameter at a plurality of time instants; A relevant parameter is determined based on the time series values.

5. The method according to claim 1, characterized in that The determining of the influencing factor based on the relevant parameters comprises: Normalizing the relevant parameters to determine normalized data; The impact factor is determined based on the normalized data and the impact factor calculation formula.

6. The method according to claim 1, characterized in that The predicting the transient inertia margin improvement index based on the influencing factor to determine the predicted value includes: The transient inertia margin improvement index is predicted based on the influencing factors and prediction rules to determine a predicted value.

7. The method according to claim 1, characterized in that The adjusting the transient inertia margin of the photovoltaic power station based on the predicted value includes: When the predicted value is less than a first threshold, determining a first adjustment parameter, and adjusting the transient inertia margin based on the first adjustment parameter; When the predicted value is less than or equal to a second threshold value and greater than or equal to the first threshold value, determining a second adjustment parameter, and adjusting the transient inertia margin based on the second adjustment parameter; When the predicted value is greater than the second threshold, a third adjustment parameter is determined, and the transient inertia margin is adjusted based on the third adjustment parameter.

8. A transient inertia margin adjustment device for a photovoltaic power station connected to the grid via a synchronous machine, characterized in that: include: A parameter determination module is configured to determine a transient inertia margin improvement index and measure relevant parameters of the transient inertia margin improvement index; An impact determination module, configured to determine an impact factor based on the relevant parameters; A prediction module is configured to predict the transient inertia margin improvement index based on the influencing factor and determine a prediction value; An adjustment module is configured to adjust the transient inertia margin of the photovoltaic power station based on the predicted value.

9. A computing device, characterized in that include: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the method for adjusting the transient inertia margin of a photovoltaic power station connected to the grid via a synchronous machine as described in any one of claims 1 to 7.

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