A Step-Type Virtual Inertia Control Method, Device and Storage Medium for New Energy

Abstract

The present invention discloses a step-type virtual inertia control method, device and storage medium for new energy. The method includes: measuring the frequency change rate of the power grid, and outputting an impact signal when it is determined according to the frequency change rate that the power grid meets a preset input condition; calculating the support power to be step-type input into the power grid according to the impact signal, and determining the power change amount of the maximum power point in the power grid; determining the power reference value acting on the outer loop control of the new energy unit according to the power change amount and the support power. The present invention adds a power command related to the system frequency on the basis of the maximum power point tracking control, so that the original power change amount and the support power input step by step act on the power reference value in the outer loop control at the same time, thereby being able to better meet the frequency stability requirements of a high-proportion new energy power system.

Description

Technical Field

[0001] The present invention relates to the technical field of power system operation, and more particularly, to a step-type virtual inertia control method, device, and storage medium for new energy. Background Art

[0002] With the vigorous development of new energy, the grid connection of a high proportion of new energy will bring a series of problems to the power system. The traditional power system operation control method is to use the regulation ability of conventional synchronous generator sets to meet the random changes of the load. New energy power generation has significant characteristics of intermittency, volatility, and randomness, which poses new requirements for the balancing ability of the power system. As the access amount of new energy in the power system continues to increase, the risk of frequency disturbance in the power grid increases, and evaluating the inertia level of the system has become an important research direction for power system frequency stability.

[0003] The essence of the inertia support provided by a synchronous generator is the spontaneous response of the rotor's motion state under the action of an unbalanced torque. Its external manifestation is that the kinetic energy generated by the change in the rotor speed is converted into the electromagnetic power output by the generator, and then injected into the power grid to make up for the frequency change at the generator terminal caused by the power imbalance in the power grid. Currently, the main inertia support modes of new energy for the power grid are the virtual synchronous machine mode and the virtual inertia mode. The disadvantage of the virtual synchronous machine control mode is that while the new energy generator set simulates the synchronous machine to provide rotational inertia, it also simulates the slow response of the synchronous generator to the system power change, thus losing the advantage of the fast response of power electronic components.

[0004] The existing new energy virtual inertia control generally adopts a droop control mode. The problem with this mode is that the magnitude of the power support input depends on the detected frequency change rate and the preset proportional coefficient. However, in a high-proportion new energy power system, the frequency distribution characteristics are becoming more prominent, and the new energy at different positions experiences different frequency change rates. This makes the power support input of the power station close to the electrical distance of the fault point large, while the power support input of the power station far from the electrical distance of the fault point small, and the inertia support ability of the new energy power station cannot be maximally exerted. In addition, the input of power support in this mode depends on a relatively accurate frequency change rate value, and the acquisition of an accurate frequency change rate is difficult and time-consuming. For the transient power support that "seizes every millisecond", its inertia support effect will be greatly discounted.

[0005] In view of the above technical problems in the prior art that the inertia support mode of new energy for the power grid cannot adapt to a high-proportion new energy power system, no effective solution has been proposed yet. Summary of the Invention

[0006] Aiming at the technical problem that the inertia support mode of new energy for the power grid in the existing technology cannot adapt to a high-proportion new energy power system, the present invention provides a step-type virtual inertia control method, device and storage medium for new energy.

[0007] According to another aspect of the present invention, there is provided a step-type virtual inertia control method for new energy, including:

[0008] Measuring the frequency change rate of the power grid, and when it is determined that the power grid meets the preset input conditions according to the frequency change rate, outputting an impact signal;

[0009] Calculating the support power that should be step-type input into the power grid according to the impact signal, and determining the power change amount of the maximum power point in the power grid;

[0010] Determining the power reference value acting on the outer loop control of the new energy unit according to the power change amount and the support power.

[0011] Optionally, before outputting the impact signal, the method further includes: comparing the measured frequency change rate with a preset frequency change rate threshold to determine whether the new energy unit meets the preset input conditions.

[0012] Optionally, comparing the measured frequency change rate with a preset frequency change rate threshold to determine whether the power grid meets the preset input conditions includes:

[0013] Determining a target frequency change rate threshold from multiple candidate frequency change rate thresholds according to the location of the new energy power station;

[0014] Comparing the measured frequency change rate with the target frequency change rate threshold to determine whether the power grid meets the preset input conditions.

[0015] Optionally, calculating the support power that should be step-type input into the power grid according to the impact signal includes:

[0016] Obtaining the current rated capacity of the new energy generating unit and the proportionality coefficient corresponding to the new energy power station;

[0017] Calculating the support power that should be step-type input into the power grid according to the obtained rated capacity of the new energy generating unit and the proportionality coefficient.

[0018] Optionally, obtaining the proportionality coefficient corresponding to the new energy power station includes:

[0019] Determining a target proportionality coefficient from multiple candidate proportionality coefficients according to the location of the new energy power station;

[0020] Determining the target proportionality coefficient as the proportionality coefficient corresponding to the new energy power station.

[0021] Optionally, determining the power change amount of the maximum power point in the power grid includes:

[0022] Determining the maximum power point of the power grid;

[0023] Obtaining the power change amount of the maximum power point to determine the power change amount of the maximum power point in the power grid.

[0024] According to another aspect of the present invention, there is provided a step-type virtual inertia control device for new energy, including:

[0025] A frequency measurement unit for measuring the frequency change rate of the power grid and outputting a shock signal when it is determined according to the measured frequency change rate that the power grid meets the preset input conditions;

[0026] A power calculation and input unit for calculating the support power to be step-type input into the power grid according to the shock signal;

[0027] A maximum power point tracking control unit for determining the power change amount of the maximum power point in the power grid;

[0028] A power reference value determination unit for determining the power reference value acting on the outer loop control of the new energy unit according to the power change amount and the support power.

[0029] Optionally, the frequency measurement unit is specifically used for: comparing the measured frequency change rate with a preset frequency change rate threshold to determine whether the power grid meets the preset input conditions.

[0030] Optionally, the frequency measurement unit is also specifically used for:

[0031] Determining a target frequency change rate threshold from multiple candidate frequency change rate thresholds according to the location of the new energy power station;

[0032] Comparing the measured frequency change rate with the target frequency change rate threshold to determine whether the power grid meets the preset input conditions.

[0033] Optionally, the power calculation and input unit is specifically used for:

[0034] Obtaining the current rated capacity of the new energy generating unit and the proportional coefficient corresponding to the new energy power station through the power calculation and input unit;

[0035] Calculating the support power to be step-type input into the power grid according to the obtained rated capacity of the new energy generating unit and the proportional coefficient.

[0036] Optionally, the power calculation and input unit is also specifically used for:

[0037] Determining a target proportional coefficient from multiple candidate proportional coefficients according to the location of the new energy power station;

[0038] Determine the target proportionality coefficient as the proportionality coefficient corresponding to the new energy power station.

[0039] Optionally, the maximum power point tracking control unit is specifically configured to:

[0040] Determine the maximum power point of the power grid;

[0041] Obtain the power change amount of the maximum power point to determine the power change amount of the maximum power point in the power grid.

[0042] According to another aspect of the present invention, there is provided a computer-readable storage medium storing a computer program for executing the method according to any one of the above aspects of the present invention.

[0043] According to another aspect of the present invention, there is provided an electronic device including: a processor; a memory for storing executable instructions of the processor; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any one of the above aspects of the present invention.

[0044] Thus, the present invention first measures the frequency change rate of the power grid and outputs an impact signal when it is determined according to the measured frequency change rate that the power grid meets the preset input conditions. Then, according to the impact signal, calculate the support power that should be stepped into the power grid. Secondly, determine the power change amount of the maximum power point in the power grid. Finally, according to the power change amount and the support power, determine the power reference value acting on the outer loop control of the new energy unit. The present invention considers the frequency distribution characteristics, that is, the different frequency change rates of each node after a fault, so as to better adapt to the high-proportion new energy power system and provide inertia support for it. By adding a power instruction related to the system frequency on the basis of the maximum power point tracking control, the original power change amount and the support power stepped in are simultaneously applied to the power reference value in the outer loop control of the new energy unit, so that the new energy generator set can quickly respond to the change of the system frequency and provide short-term power support. The present invention can improve the secondary frequency drop and extend the recovery time of the rotor speed, so as to provide inertia support for the high-proportion new energy power system faster and better. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] By referring to the following drawings, the exemplary embodiments of the present invention can be more completely understood:

[0046] Figure 1 is a schematic flowchart of a step-by-step virtual inertia control method for new energy provided by an exemplary embodiment of the present invention;

[0047] Figure 2It is a schematic diagram of the cooperation relationship among the frequency measurement unit, the power calculation and input unit, and the maximum power point tracking control unit provided by an exemplary embodiment of the present invention;

[0048] Figure 3 It is a diagram showing the action of the coupling relationship between the frequency measurement unit and the power calculation and input unit provided by an exemplary embodiment of the present invention;

[0049] Figure 4 It is a schematic structural diagram of a step - type virtual inertia control device for new energy provided by an exemplary embodiment of the present invention;

[0050] Figure 5 It is the structure of an electronic device provided by an exemplary embodiment of the present invention. Detailed implementation manners

[0051] Next, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments of the present invention. It should be understood that the present invention is not limited by the exemplary embodiments described herein.

[0052] It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention.

[0053] Those skilled in the art can understand that terms such as "first", "second", etc. in the embodiments of the present invention are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate an inevitable logical order between them.

[0054] It should also be understood that in the embodiments of the present invention, "a plurality of" may refer to two or more, and "at least one" may refer to one, two or more.

[0055] It should also be understood that for any component, data or structure mentioned in the embodiments of the present invention, without clear limitation or contrary indication in the context, it is generally understood as one or more.

[0056] In addition, the term "and / or" in the present invention is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the associated objects before and after.

[0057] It should also be understood that the present invention emphasizes the differences between various embodiments. The same or similar parts can be referred to each other. For the sake of brevity, they will not be described one by one.

[0058] Meanwhile, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationship.

[0059] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present invention, its application, or its use.

[0060] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and devices should be regarded as part of the specification.

[0061] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

[0062] Embodiments of the present invention can be applied to electronic devices such as terminal devices, computer systems, servers, etc., which can operate together with numerous other general-purpose or special-purpose computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments, and / or configurations suitable for use with terminal devices, computer systems, servers, etc. include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, minicomputer systems, mainframe computer systems, and distributed cloud computing technology environments including any of the above systems, and so on.

[0063] Terminal devices, computer systems, servers, etc. can be described in the general context of computer system-executable instructions (such as program modules) executed by a computer system. Generally, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. The computer system / server can be implemented in a distributed cloud computing environment where tasks are executed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media including storage devices.

[0064] Exemplary method

[0065] Figure 1 It is a schematic flowchart of a step-by-step virtual inertia control method for new energy provided by an exemplary embodiment of the present invention. This embodiment can be applied to an electronic device, such as Figure 1 As shown, the step-by-step virtual inertia control method 100 for new energy includes the following steps:

[0066] Step 101: Measure the rate of change of the grid frequency, and output a shock signal when it is determined according to the rate of change of the frequency that the grid meets the preset input conditions.

[0067] In the embodiments of the present invention, new energy simulates virtual inertia by stepwise input power to provide inertia support for the power system. The stepwise virtual inertia control method for new energy proposed by the present invention mainly involves a frequency measurement unit, a power calculation and input unit, and a maximum power point tracking control unit. The cooperation relationship among the three units is as Figure 2 shown. Refer to Figure 2 shown. The frequency measurement unit measures the grid frequency f and the rate of change of the frequency in real time for detecting the frequency fluctuation of the grid.

[0068] Optionally, the method further includes: comparing the measured rate of change of the frequency with a preset rate-of-change-of-frequency threshold to determine whether the grid meets the preset input conditions.

[0069] In the embodiments of the present invention, a rate-of-change-of-frequency threshold is preset After the frequency measurement unit measures the rate of change of the frequency it compares the measured rate of change of the frequency with the preset rate-of-change-of-frequency threshold to determine whether the grid meets the preset input conditions. When the measured rate of change of the frequency exceeds the preset rate-of-change-of-frequency threshold it is determined that the grid meets the preset input conditions. Similarly, when the measured rate of change of the frequency does not exceed the preset rate-of-change-of-frequency threshold it is determined that the grid does not meet the preset input conditions.

[0070] Optionally, comparing the measured rate of change of the frequency with a preset rate-of-change-of-frequency threshold to determine whether the grid meets the preset input conditions includes: determining a target rate-of-change-of-frequency threshold from multiple candidate rate-of-change-of-frequency thresholds according to the location of the new energy power station; comparing the measured rate of change of the frequency with the target rate-of-change-of-frequency threshold to determine whether the grid meets the preset input conditions.

[0071] In the embodiments of the present invention, the power grid will preset a frequency change rate threshold. Based on this frequency change rate threshold of the power grid, different frequency change rate thresholds can be set for new energy power stations at different locations, and the frequency change rate thresholds set for new energy power stations at different locations are required to be not lower than this frequency change rate threshold of the power grid, so as to better adapt to the high-proportion new energy power system and provide inertia support for it. Therefore, when comparing the measured frequency change rate with the preset frequency change rate threshold, it is necessary to first determine a target frequency change rate threshold from multiple candidate frequency change rate thresholds according to the location of the new energy power station. Then compare the measured frequency change rate with the target frequency change rate threshold to determine whether the power grid meets the preset input conditions.

[0072] Step 102: Calculate the support power that should be stepped into the power grid according to the impact signal, and determine the power change amount of the maximum power point in the power grid.

[0073] Optionally, calculating the support power that should be stepped into the power grid includes: obtaining the current rated capacity of the new energy generating unit and the proportionality coefficient corresponding to the new energy power station; calculating the support power that should be stepped into the power grid according to the obtained rated capacity of the new energy generating unit and the proportionality coefficient.

[0074] In the embodiments of the present invention, as shown in Figure 3 When the measured frequency change rate exceeds the preset frequency change rate threshold , the power grid meets the preset input conditions. After that, the new energy power station steps into the power grid with a power support of ΔP w = ηS w , where η is the proportionality coefficient and S w is the rated capacity of the new energy generating unit.

[0075] It should be particularly noted that the rated capacity S w of the new energy generating unit may vary with time. For example, the S w on the current day may be different from the S w on the next day. Moreover, different proportionality coefficients η can be set for new energy power stations at different locations. Therefore, the present invention needs to first obtain the current rated capacity of the new energy generating unit and the proportionality coefficient corresponding to the new energy power station, and then calculate the support power that should be stepped into the power grid according to the obtained rated capacity of the new energy generating unit and the proportionality coefficient.

[0076] Optionally, obtaining the proportionality coefficient corresponding to the new energy power station includes: determining a target proportionality coefficient from multiple candidate proportionality coefficients according to the location of the new energy power station; determining the target proportionality coefficient as the proportionality coefficient corresponding to the new energy power station.

[0077] In the embodiment of the present invention, since different new energy power stations at different locations are provided with different proportionality coefficients η, when obtaining the proportionality coefficient corresponding to the new energy power station, it is necessary to first determine a target proportionality coefficient from multiple candidate proportionality coefficients according to the location of the new energy power station, and then determine the target proportionality coefficient as the proportionality coefficient corresponding to the new energy power station.

[0078] Optionally, determining the power change amount of the maximum power point in the power grid includes: determining the maximum power point of the power grid; obtaining the power change amount of the maximum power point to determine the power change amount of the maximum power point in the power grid.

[0079] In the embodiment of the present invention, taking photovoltaic power generation as an example, its output is affected by the environment and load conditions. When the light intensity and environmental temperature change, the load curve that can provide the maximum power transfer efficiency also changes accordingly. If the load can be adjusted in cooperation with the load curve with the highest power transfer efficiency, the system will have the best efficiency. The load characteristic with the highest power transfer efficiency is called the maximum power point. The maximum power point tracking control unit is to find the maximum power point by changing the equivalent load it drives and maintain the load characteristic at this power point, aiming to obtain the maximum power output under various circumstances.

[0080] Step 103: Determine the power reference value acting on the outer loop control of the new energy unit according to the power change amount and the support power.

[0081] In the embodiment of the present invention, based on the maximum power point tracking control, a power command related to the system frequency is added, so that the original power change amount ΔP and the ΔP of the stepwise input power w act on the power reference value P in the outer loop control at the same time ref , that is, P ref =ΔP + ΔP w . The power input in a stepwise manner is used to simulate the virtual inertia support of the fan, so that the new energy generator set can quickly respond to the change of the system frequency and provide short-term power support.

[0082] Thus, the present invention first measures the rate of change of the grid frequency, and outputs a shock signal when it is determined according to the measured rate of change of the frequency that the grid meets the preset input conditions. Then, according to the shock signal, the support power to be stepped into the grid is calculated. Secondly, the power change amount of the maximum power point in the grid is determined. Finally, according to the power change amount and the support power, the power reference value acting on the outer loop control of the new energy unit is determined. The present invention considers the frequency distribution characteristics, that is, the different rates of change of frequency at each node after a fault, and can set different thresholds of the rate of change of frequency for new energy stations at different positions, so as to better adapt to the high-proportion new energy power system and provide inertia support for it. By adding a power command related to the system frequency on the basis of the maximum power point tracking control, the original power change amount and the support power stepped in are simultaneously applied to the power reference value in the outer loop control of the new energy unit, so that the new energy generator can quickly respond to the change of the system frequency and provide short-term power support. The present invention can improve the secondary frequency dip and extend the recovery time of the rotor speed, so as to provide inertia support for the high-proportion new energy power system faster and better. The present invention can ensure the reliability of the virtual inertia input through a flexible withdrawal strategy and by combining security control information, etc., and can be used for the analysis and operation of the actual power grid, and has high engineering applicability.

[0083] Exemplary system

[0084] Figure 4 It is a schematic structural diagram of a stepped virtual inertia control device for new energy provided by an exemplary embodiment of the present invention. As Figure 4 shown, the device 400 includes:

[0085] A frequency measurement unit 410, configured to measure the rate of change of the grid frequency, and output a shock signal when it is determined according to the measured rate of change of the frequency that the grid meets the preset input conditions;

[0086] A power calculation and input unit 420, configured to calculate the support power to be stepped into the grid according to the shock signal;

[0087] A maximum power point tracking control unit 430, configured to determine the power change amount of the maximum power point in the grid;

[0088] A power reference value determination unit 440, configured to determine the power reference value acting on the outer loop control of the new energy unit according to the power change amount and the support power.

[0089] Optionally, the frequency measurement unit 410 is specifically configured to: compare the measured rate of change of the frequency with a preset threshold of the rate of change of the frequency to determine whether the grid meets the preset input conditions.

[0090] Optionally, the frequency measurement unit 410 is further specifically configured to:

[0091] Determine a target frequency change rate threshold from multiple candidate frequency change rate thresholds according to the location of the new energy power station;

[0092] Compare the measured frequency change rate with the target frequency change rate threshold to determine whether the power grid meets the preset input conditions.

[0093] Optionally, the power calculation and input unit 420 is specifically configured to:

[0094] Obtain the rated capacity of the current new energy generating unit and the proportionality coefficient corresponding to the new energy power station through the power calculation and input unit;

[0095] Calculate the support power that should be stepwise input into the power grid according to the obtained rated capacity of the new energy generating unit and the proportionality coefficient.

[0096] Optionally, the power calculation and input unit 420 is further specifically configured to:

[0097] Determine a target proportionality coefficient from multiple candidate proportionality coefficients according to the location of the new energy power station;

[0098] Determine the target proportionality coefficient as the proportionality coefficient corresponding to the new energy power station.

[0099] Optionally, the maximum power point tracking control unit 430 is specifically configured to:

[0100] Determine the maximum power point of the power grid;

[0101] Obtain the power change amount of the maximum power point to determine the power change amount of the maximum power point in the power grid.

[0102] The stepwise virtual inertia control device 400 for new energy in the embodiment of the present invention corresponds to the stepwise virtual inertia control method 100 for new energy in another embodiment of the present invention, which will not be elaborated here.

[0103] Exemplary electronic device

[0104] Figure 5 It is the structure of an electronic device provided by an exemplary embodiment of the present invention. The electronic device can be any one or both of the first device and the second device, or a stand-alone device independent of them. The stand-alone device can communicate with the first device and the second device to receive the input signals collected from them. Figure 5 The block diagram of the electronic device according to the embodiment of the present invention is illustrated. As Figure 5 shown, the electronic device 50 includes one or more processors 51 and a memory 52.

[0105] The processor 51 may be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0106] The memory 52 may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage media, and the processor 51 may run the program instructions to implement the method of information mining on historical change records in the software programs of various embodiments of the present invention described above and / or other desired functions. In one example, the electronic device may further include: an input system 53 and an output system 54, and these components are interconnected through a bus system and / or other forms of connection mechanisms (not shown).

[0107] In addition, the input system 53 may further include, for example, a keyboard, a mouse, and so on.

[0108] The output system 54 may output various information to the outside. The output device 54 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, and so on.

[0109] Of course, for simplicity, Figure 5 only some of the components related to the present invention in the electronic device are shown, and components such as a bus, an input / output interface, and so on are omitted. In addition, according to specific application scenarios, the electronic device may further include any other appropriate components.

[0110] Exemplary computer program product and computer-readable storage medium

[0111] In addition to the above methods and devices, embodiments of the present invention may also be computer program products, which include computer program instructions that, when run by a processor, cause the processor to execute the steps in the method of information mining on historical change records according to various embodiments of the present invention described in the "Exemplary Method" section above in this specification.

[0112] The computer program product can be written in any combination of one or more programming languages for executing the program code of the operations of the embodiments of the present invention. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, executed as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0113] In addition, an embodiment of the present invention can also be a computer-readable storage medium storing computer program instructions, which when run by a processor cause the processor to execute the steps in the method of information mining of historical change records according to various embodiments of the present invention described in the above "Exemplary Method" section of this specification.

[0114] The computer-readable storage medium can adopt any combination of one or more readable media. The readable media can be a readable signal medium or a readable storage medium. The readable storage medium can, for example, include but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the readable storage medium include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0115] The basic principles of the present invention have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present invention. In addition, the above-disclosed specific details are only for the purposes of illustration and facilitating understanding, rather than limitations. The above details do not limit the present invention to necessarily adopt the above specific details for implementation.

[0116] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and reference can be made to the partial description of the method embodiment for the relevant parts.

[0117] The block diagrams of the devices, systems, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, equipment, and systems can be connected, arranged, and configured in any way. Words such as "including", "comprising", "having", etc. are open-ended terms meaning "including but not limited to" and can be used interchangeably with each other. The word "or" and "and" used herein refer to the phrase "and / or" and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to" and can be used interchangeably with it.

[0118] The methods and systems of the present invention can be implemented in many ways. For example, the methods and systems of the present invention can be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of the steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the specific order described above, unless otherwise specifically stated. In addition, in some embodiments, the present invention can also be implemented as a program recorded in a recording medium, and these programs include machine-readable instructions for implementing the methods according to the present invention. Therefore, the present invention also covers a recording medium storing a program for executing the methods according to the present invention.

[0119] It should also be noted that in the systems, equipment, and methods of the present invention, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0120] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A step - type virtual inertia control method for new energy, characterized in that, Including: Measuring the frequency change rate of the power grid, and when it is determined that the power grid meets the preset input conditions according to the frequency change rate, outputting an impact signal; Calculating the support power to be stepwise input into the power grid according to the impact signal, and determining the power change amount of the maximum power point in the power grid; Determining the power reference value acting on the outer loop control of the new energy unit according to the power change amount and the support power.

2. The method according to claim 1, characterized in that, Before outputting the impact signal, it further includes: comparing the measured frequency change rate with a preset frequency change rate threshold to determine whether the power grid meets the preset input conditions.

3. The method according to claim 2, wherein Comparing the measured frequency change rate with a preset frequency change rate threshold to determine whether the power grid meets the preset input conditions, including: Determining a target frequency change rate threshold from multiple candidate frequency change rate thresholds according to the location of the new energy power station; Comparing the measured frequency change rate with the target frequency change rate threshold to determine whether the power grid meets the preset input conditions.

4. The method according to claim 1, characterized in that Calculating the support power to be stepwise input into the power grid according to the impact signal, including: Obtaining the current rated capacity of the new energy generating unit and the proportionality coefficient corresponding to the new energy power station according to the impact signal; Calculating the support power to be stepwise input into the power grid according to the obtained rated capacity of the new energy generating unit and the proportionality coefficient.

5. The method according to claim 4, characterized in that, Obtaining the proportionality coefficient corresponding to the new energy power station, including: Determining a target proportionality coefficient from multiple candidate proportionality coefficients according to the location of the new energy power station; Determining the target proportionality coefficient as the proportionality coefficient corresponding to the new energy power station.

6. The method according to claim 1, wherein Determining the power change amount of the maximum power point in the power grid, including: Determining the maximum power point of the power grid; Obtaining the power change amount of the maximum power point to determine the power change amount of the maximum power point in the power grid.

7. A step - type virtual inertia control device for new energy, characterized in that, Including: A frequency measurement unit for measuring the frequency change rate of the power grid and outputting an impact signal when it is determined that the power grid meets the preset input conditions according to the frequency change rate; A power calculation and input unit for calculating the support power to be stepwise input into the power grid according to the impact signal; A maximum power point tracking control unit for determining the power change amount of the maximum power point in the power grid; A power reference value determination unit for determining the power reference value acting on the outer loop control of the new energy unit according to the power change amount and the support power.

8. The device according to claim 7, characterized in that, The frequency measurement unit is specifically used for: comparing the measured frequency change rate with a preset frequency change rate threshold to determine whether the power grid meets the preset input conditions.

9. The device according to claim 8, characterized in that The frequency measurement unit is also specifically used for: Determining a target frequency change rate threshold from multiple candidate frequency change rate thresholds according to the location of the new energy power station; Comparing the measured frequency change rate with the target frequency change rate threshold to determine whether the power grid meets the preset input conditions.

10. The device according to claim 7, characterized in that, The power calculation and input unit is specifically used for: Obtaining the current rated capacity of the new energy generating unit and the proportionality coefficient corresponding to the new energy power station through the power calculation and input unit; Calculating the support power to be stepwise input into the power grid according to the obtained rated capacity of the new energy generating unit and the proportionality coefficient.

11. The device according to claim 10, wherein, The power calculation and input unit is also specifically used for: Determine a target proportionality coefficient from multiple candidate proportionality coefficients according to the location of the new energy power station; Determine the target proportionality coefficient as the proportionality coefficient corresponding to the new energy power station.

12. The device according to claim 7, characterized in that, The maximum power point tracking control unit is specifically used for: Determine the maximum power point of the power grid; Obtain the power change amount of the maximum power point to determine the power change amount of the maximum power point in the power grid.

13. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, and the computer program is used to execute the method described in any one of claims 1-6 above.

14. An electronic device, characterized in that, The electronic device includes: A processor; A memory for storing executable instructions of the processor; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1-6 above.

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