Methods and apparatus for analyzing the active power response characteristics of power electronic equipment

Abstract

This application provides a method and apparatus for analyzing the active power response characteristics of power electronic equipment. The method includes: acquiring the frequency domain curve of a target power electronic equipment, wherein the target power electronic equipment is a power electronic equipment connected to the power grid, and the frequency domain curve is an amplitude-frequency characteristic curve showing the ratio between the amplitude of the phase element of the modulated voltage superimposed with the amplitude of the response active power as a function of frequency; and completing the active power response characteristic analysis of the target power electronic equipment based on the slope and amplitude of the frequency domain curve in multiple frequency bands. This application can realize the active power response characteristic analysis of power electronic equipment during actual operation, improving the reliability of the active power response characteristic analysis.

Description

Technical Field

[0001] This application relates to the field of power electronic equipment analysis technology, and in particular to a method and apparatus for analyzing the active power response characteristics of power electronic equipment. Background Technology

[0002] With the rapid growth of new energy sources such as wind and solar power, and the accelerated trend of power grid electrification, the proportion of traditional synchronous generators is gradually decreasing, and they generally lack spinning reserve capacity and rotational inertia. New power systems characterized by a high proportion of new energy sources and high proportion of power electronic equipment are prone to lacking necessary inertial support, which can lead to frequency stability problems. Therefore, properly assessing the active power response characteristics of connected equipment and configuring appropriate active power support equipment is crucial for system stability.

[0003] For traditional synchronous machines, the active power response characteristics are generally measured using the frequency regulation coefficient and the inertia time constant. For power electronic devices employing virtual synchronous machine control methods, there are also corresponding frequency regulation coefficients and virtual inertia time constants, which can reflect the active power support capability of the power electronic devices to a certain extent. However, the control structure of power electronic devices is complex, exhibiting multi-time-scale coupling characteristics, and other components and parameters can affect the active power support capability. One report suggests that the ratio of power disturbance to frequency disturbance, ΔP / Δω, can be used to measure active power support capability. This method uses theoretical analysis to evaluate the support capability of connected equipment in various frequency bands.

[0004] However, when the controller structure and parameters are unknown, this indicator is only applicable to simulated operating conditions. In actual operation, the frequency of the power grid cannot fluctuate according to the given value of the test, thus limiting the application scope of this indicator.

[0005] This section is intended to provide background or context for the embodiments of the invention set forth in the claims. The description herein is not an admission that it is prior art simply because it is included in this section. Summary of the Invention

[0006] To address at least one problem in the prior art, this application proposes a method and apparatus for analyzing the active power response characteristics of power electronic equipment, which can realize the analysis of the active power response characteristics of power electronic equipment during actual operation and improve the reliability of the active power response characteristic analysis.

[0007] To address the aforementioned technical problems, this application provides the following technical solution: In a first aspect, this application provides a method for analyzing the active power response characteristics of power electronic equipment, including: Obtain the frequency domain curve of the target power electronic device, which is a power electronic device connected to the power grid. The frequency domain curve is the amplitude-frequency characteristic curve of the ratio between the amplitude of the phase element of the modulation voltage superimposed on the disturbance signal and the amplitude of the response active power as a function of frequency. Based on the slope and amplitude of the frequency domain curves in multiple frequency bands, the active power response characteristics of the target power electronic equipment are analyzed.

[0008] In one embodiment, obtaining the frequency domain curve of the target power electronic device includes: Multiple frequency points within a preset frequency detection range are acquired. At each of the frequency points, a phase element of the modulation voltage is superimposed with a disturbance signal, and the active power output by the target power electronic device is detected. The frequency domain curve is obtained by fitting the phase element of the modulation voltage corresponding to each frequency point, superimposing the disturbance signal and the response active power.

[0009] In one embodiment, the step of acquiring multiple frequency points within a preset frequency detection range, applying a phase element of the modulation voltage superimposed with a disturbance signal to the target power electronic device at each of the frequency points, and detecting the response active power output by the target power electronic device includes: Multiple frequency points within a preset frequency detection range are obtained, and the frequency intervals of each frequency point are the same. A phase element superimposed disturbance signal corresponding to the modulation voltage at each frequency point is applied to the target power electronic device; After applying a disturbance signal to the phase element of the modulation voltage corresponding to each frequency point, the active power output of the target power electronic device at that frequency point is detected when the power electronic device reaches the steady-state operating point.

[0010] In one embodiment, the step of fitting the frequency domain curve by superimposing the disturbance signal and the response active power on the phase element of the modulation voltage corresponding to each frequency point includes: By using Fast Fourier Transform, the amplitude of the response active power and the phase element superimposed disturbance signal of the modulation voltage corresponding to each frequency point is obtained. The amplitude-frequency characteristic curve is obtained by fitting the amplitude of the disturbance signal superimposed on the active power of the response and the phase element of the modulation voltage at each frequency point.

[0011] In one embodiment, the step of performing active power response characteristic analysis of the target power electronic device based on the slope and amplitude of the frequency domain curves in multiple frequency bands includes: Obtain the slope of the frequency domain curve in the low-frequency band, and determine whether the target power electronic device has frequency modulation capability based on the slope of the low-frequency band. The amplitude of the frequency domain curve in each frequency band is obtained, and the corresponding active power support capability level is determined based on the amplitude of each frequency band.

[0012] In one embodiment, the target power electronic device is a grid-type static var generator; correspondingly, obtaining the frequency domain curve of the target power electronic device includes: Obtain the small-signal mathematical model of the grid-type static var generator; The frequency domain curve is obtained based on the small-signal mathematical model.

[0013] Secondly, this application provides an active power response characteristic analysis device for power electronic equipment, comprising: The acquisition module is used to acquire the frequency domain curve of the target power electronic device, which is a power electronic device connected to the power grid. The frequency domain curve is the amplitude-frequency characteristic curve of the ratio between the amplitude of the phase element of the modulation voltage superimposed on the disturbance signal and the amplitude of the response active power as a function of frequency. The analysis module is used to perform active power response characteristic analysis of the target power electronic equipment based on the slope and amplitude of the frequency domain curve in multiple frequency bands.

[0014] Thirdly, this application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the active power response characteristic analysis method of the power electronic device.

[0015] Fourthly, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the active power response characteristic analysis method for the power electronic equipment.

[0016] Fifthly, this application provides a computer program product, which includes a computer program that, when executed by a processor, implements the active power response characteristic analysis method for the power electronic equipment.

[0017] As can be seen from the above technical solution, this application provides a method and apparatus for analyzing the active power response characteristics of power electronic equipment. The method includes: acquiring the frequency domain curve of a target power electronic equipment, wherein the target power electronic equipment is a power electronic equipment connected to the power grid, and the frequency domain curve is an amplitude-frequency characteristic curve showing the ratio between the amplitude of the phase element of the modulated voltage superimposed with the amplitude of the response active power as a function of frequency; and performing active power response characteristic analysis of the target power electronic equipment based on the slope and amplitude of the frequency domain curve in multiple frequency bands. This method enables the analysis of the active power response characteristics of power electronic equipment during actual operation, improves the reliability of the active power response characteristic analysis, and thus expands the application scope of the active power response characteristic analysis. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a first flowchart illustrating the active power response characteristic analysis method for power electronic equipment in this application embodiment; Figure 2 This is a second flowchart illustrating the active power response characteristic analysis method for power electronic equipment in the embodiments of this application; Figure 3 This is a schematic diagram of the third process of the active power response characteristic analysis method for power electronic equipment in the embodiments of this application; Figure 4 This is a schematic diagram of the fourth process of the active power response characteristic analysis method for power electronic equipment in the embodiments of this application; Figure 5 This is the small-signal transfer function model of the mesh-type SVG in the application example of this application; Figure 6 This is a comparative schematic diagram of the amplitude-frequency response curve and phase-frequency response curve under different conditions in the examples of this application; Figure 7 This is a schematic diagram of the active power response characteristic analysis device of the power electronic equipment in the embodiments of this application; Figure 8 This is a schematic block diagram of the system configuration of an electronic device according to an embodiment of this application. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] The following examples illustrate this in detail.

[0021] To improve the reliability of active power response characteristic analysis in actual operation of power electronic equipment, this embodiment provides a method for analyzing the active power response characteristics of power electronic equipment, wherein the execution subject is an active power response characteristic analysis device of the power electronic equipment. This active power response characteristic analysis device includes, but is not limited to, a server, such as... Figure 1 As shown, this method specifically includes the following: Step 100: Obtain the frequency domain curve of the target power electronic device, wherein the target power electronic device is a power electronic device connected to the power grid, and the frequency domain curve is the amplitude-frequency characteristic curve of the ratio between the amplitude of the phase element of the modulation voltage superimposed on the disturbance signal and the amplitude of the response active power as a function of frequency.

[0022] Step 200: Based on the slope and amplitude of the frequency domain curves in multiple frequency bands, complete the active power response characteristic analysis of the target power electronic equipment.

[0023] Specifically, the active power response characteristics of the target power electronic equipment can be analyzed based on the slope and amplitude of the amplitude-frequency response curve and the slope and amplitude of the phase-frequency response curve in multiple frequency bands. The frequency domain curve can represent the curve form of the active power support index. The frequency bands may include low-frequency, high-frequency, and mid-frequency bands. Multiple frequency bands can be pre-divided according to actual conditions; this application does not impose any limitations on this.

[0024] Furthermore, to broaden the application scenarios and analyze the impact of different conditions on the active power response characteristics of power electronic equipment, frequency domain curves of the target power electronic equipment under various conditions can be obtained. Based on the frequency domain curves under each condition, the active power response characteristics of the target power electronic equipment under that condition can be analyzed, allowing for a comparison of the differences in active power response characteristics under different conditions. Each condition can include: the equipment type, control method, and parameter conditions of the target power electronic equipment; for example, if the equipment type is grid-connected energy storage, the control method is droop control, and the parameter conditions include: the values ​​of equivalent virtual damping and virtual inertia; if the equipment type is grid-connected energy storage, the control method is active power outer loop-current inner loop control, and the parameter conditions include: proportional gain (Kp) and integral gain (Ki), etc.

[0025] To achieve online active power response characteristic analysis when control is unknown, such as Figure 2 As shown, in one embodiment, step 100 includes: Step 110: Obtain multiple frequency points within a preset frequency detection range, and apply a phase element superimposed with a modulation voltage to the target power electronic device at each of the frequency points, thereby detecting the response active power output by the target power electronic device.

[0026] Step 120: Based on the phase element of the modulation voltage corresponding to each frequency point, superimpose the disturbance signal and the response active power to obtain the frequency domain curve.

[0027] Specifically, a request for active power response characteristic analysis of a target power electronic device can be received. Based on the request, it can be determined whether the control loop and parameter information of the target power electronic device exist locally. If not, multiple frequency points within a preset frequency detection range are acquired. At each of the frequency points, a phase element of the modulation voltage is superimposed with a disturbance signal to the target power electronic device, and the response active power output by the target power electronic device is detected. Based on the phase element of the modulation voltage superimposed with the disturbance signal and the response active power corresponding to each frequency point, the frequency domain curve is fitted. If the control loop and parameter information of the target power electronic device exist locally, the frequency domain curve can be obtained based on the control loop and parameter information.

[0028] To improve the reliability of frequency domain curves, such as Figure 3 As shown, in one embodiment, step 110 includes: Step 111: Obtain multiple frequency points within a preset frequency detection range, with each frequency point having the same frequency interval.

[0029] Specifically, the preset frequency detection range and frequency interval can be set according to the actual situation, and this application does not impose any restrictions on them.

[0030] Step 112: Apply a phase element superimposed disturbance signal of the modulation voltage corresponding to each frequency point to the target power electronic device.

[0031] Specifically, the phase element superimposed perturbation signal of the modulation voltage applied at each frequency point can represent the phase element superimposed perturbation signal of the modulation voltage applied at the same frequency point.

[0032] Step 113: After applying a disturbance signal to the phase element of the modulation voltage corresponding to each frequency point, when the power electronic device reaches the steady-state operating point, the response active power output of the target power electronic device at that frequency point is detected.

[0033] Specifically, after applying a disturbance signal superimposed on the phase element at frequency N to the target power electronic device, when the power electronic device reaches its steady-state operating point, the response active power output by the target power electronic device at this time can be detected as the response active power corresponding to frequency point N. The steady-state operating point can be set according to actual conditions, and this application does not impose any restrictions on it.

[0034] To improve the reliability of frequency domain curves, such as Figure 3 As shown, in one embodiment, step 120 includes: Step 121: Obtain the amplitude of the superimposed disturbance signal of the response active power and the phase element of the modulation voltage at each frequency point through fast Fourier transform.

[0035] Step 122: Based on the amplitude of the disturbance signal superimposed on the phase element of the modulation voltage and the response active power corresponding to each frequency point, the amplitude-frequency characteristic curve is obtained by fitting.

[0036] To improve the accuracy of active power response characteristic analysis, in one embodiment, step 200 includes: Step 210: Obtain the slope of the frequency domain curve in the low-frequency band, and determine whether the target power electronic device has frequency modulation capability based on the slope of the low-frequency band curve.

[0037] Specifically, if the slope of the low-frequency band of the amplitude-frequency characteristic curve is a preset slope, then the target power electronic device is determined to have frequency modulation capability; if the slope of the low-frequency band of the amplitude-frequency characteristic curve is greater than the preset slope, then the target power electronic device is determined not to have frequency modulation capability. The preset slope can be set according to actual conditions, and this application does not impose any restrictions on it. Preferably, the preset slope is 20dB / decibels.

[0038] Step 220: Obtain the amplitude of the frequency domain curve in each frequency band, and determine the corresponding active power support capability level based on the amplitude of each frequency band.

[0039] Specifically, a larger amplitude of the frequency domain curve indicates stronger active power support performance in the corresponding frequency band. The active power support capability level for a given frequency band can be determined based on the preset correspondence between amplitude ranges and active power support capability levels, as well as the amplitude of each frequency band. The preset correspondence between amplitude ranges and active power support capability levels can be set according to actual conditions, and this application does not impose any restrictions on this. Both active power support capability level and frequency modulation capability can reflect active power response characteristics.

[0040] To enable active power response characteristic analysis when the control loop and parameters are known, in one embodiment, the target power electronic device is a grid-type static var generator; correspondingly, such as... Figure 4 As shown, step 100 includes: Step 101: Obtain the small-signal mathematical model of the grid-type static var generator.

[0041] Step 102: Obtain the frequency domain curve based on the small signal mathematical model.

[0042] Specifically, step 101 may include: 1) Obtain the DC voltage, active power control equations, and power loop equations of the grid-type static var generator.

[0043] Specifically, the equations for the DC voltage and active power control are as follows:

[0044] in, For reference DC voltage, DC voltage This refers to the proportional coefficient of the DC voltage controller. The integral coefficient of the DC voltage controller. For reference active power, For complex frequencies, The inertial time constant, The damping coefficient is... The rated angular frequency, This refers to the phase angle of the device.

[0045] Specifically, the power loop equation is:

[0046] in, Active power The output voltage of the target power electronic device. This is the grid voltage. The equivalent reactance of the target power electronic equipment to the power grid. For the phase angle of the power grid, The DC-side equivalent capacitance of the target power electronic device.

[0047] 2) Based on the DC voltage and active power control equations and the power loop equations, the small-signal mathematical model of the grid-type static var generator is obtained.

[0048] Specifically, the small-signal mathematical model is as follows:

[0049] Among them, coefficient Equivalent reactance X The larger the value, the smaller the value. , , The values ​​are, in order, the phase angle of the target power electronic device, the phase angle of the power grid, and the steady-state value of the DC voltage.

[0050] Specifically, step 102 may include: deriving the active power support index based on the small-signal mathematical model, and plotting the active power support index in its curve form, i.e., the frequency domain curve. The active power support index is:

[0051] To further improve the reliability of active power response characteristic analysis, step 100 may include: If the target power electronic device is a grid-type static var generator (SVA), a first frequency domain curve can be obtained by superimposing the disturbance signal and the response active power on the phase element of the modulation voltage corresponding to each frequency point within a preset frequency detection range; a second frequency domain curve can be obtained based on the small-signal mathematical model; the frequency domain curve includes the first frequency domain curve and the second frequency domain curve; correspondingly, step 200 may include: obtaining a first active power response characteristic analysis result based on the first frequency domain curve; obtaining a second active power response characteristic analysis result based on the second frequency domain curve; and determining the final active power response characteristic analysis result of the grid-type SVA based on the second active power response characteristic analysis result and the first active power response characteristic analysis result. The first frequency domain curve represents the fitted frequency domain curve, and the second frequency domain curve can represent the frequency domain curve derived from the small-signal mathematical model. For example, if either the second active response characteristic analysis result or the first active response characteristic analysis result indicates that the generator does not have frequency regulation capability, then it is determined that the grid-type static var generator does not have frequency regulation capability. Based on the amplitude of the first frequency domain curve in each frequency band, the corresponding active power support capability level is determined. Based on the amplitude of the second frequency domain curve in each frequency band, the corresponding active power support capability level is determined, thereby completing the active response characteristic analysis of the grid-type static var generator.

[0052] To further illustrate this solution, this application provides an application example of a method for analyzing the active power response characteristics of power electronic equipment. In this application example, active power response characteristic analysis can be performed based on frequency domain evaluation, and the actual test operation process is given. The method specifically includes: Step 1: Set the frequency detection range and frequency interval of the signal according to the requirements, and adjust the power electronic equipment under test to a reasonable steady-state operating point.

[0053] Step 2: For the connected power electronic equipment, a disturbance signal Δδ is superimposed on the phase element of the modulation voltage generated by the controller, and the output active power ΔP is detected. Tests are performed at each frequency point according to the frequency detection range and frequency interval, and the amplitude and phase of the disturbance signal Δδ and the response active power ΔP are obtained through FFT.

[0054] Step 3: After the test, calculate and plot the active power support index K. P The frequency domain curves of ΔP / Δδ are used to compare the characteristics under different control methods and parameter conditions. The active power support index is: (1) in, It refers to a complex frequency. The active power support index reflects the active power response capability under phase angle disturbances; a larger amplitude indicates stronger active power support performance. The active power support index can be calculated theoretically when the control elements and parameters are known, or it can be tested online when the control is unknown.

[0055] The characteristics of active power support indicators in the low-frequency band reflect primary frequency regulation capability, in the mid-frequency band reflect inertial response capability, and in the high-frequency band reflect instantaneous support capability. Specifically, after obtaining the frequency domain curve of the active power support indicator, the judgment method is as follows: (1) For the low frequency band, if the slope of the frequency domain curve is 20dB / ten times the frequency band, it indicates that it has frequency modulation capability.

[0056] (2) For the low frequency band, if the slope of the frequency domain curve is greater than 20dB / decade, it indicates that it does not have frequency modulation capability.

[0057] (3) The larger the amplitude of the frequency domain curve, the stronger the active power support performance of the corresponding frequency band.

[0058] Taking a grid-type static var generator (SG) as an example, the effectiveness of the active power support index is illustrated. Considering DC voltage and active power control, the controller is as follows: (2) in, For reference DC voltage, DC voltage , For the proportional and integral coefficients of the DC voltage controller, For reference active power, The inertial time constant, The damping coefficient is... The rated angular frequency, Let be the phase angle of the device. The mathematical equation for the power loop is as follows: (3) in, Active power The output voltage of the device. This is the grid voltage. The equivalent reactance from the equipment to the power grid. For the phase angle of the power grid, This is the equivalent capacitance on the DC side of the device.

[0059] Based on (2) and (3), the mathematical model of small signal of SVG network is derived, see formula (4) and (5).

[0060] (4) (5) Among them, coefficient Equivalent reactance X The larger the value, the smaller the value. , , These are the steady-state values ​​of the equipment phase angle, the grid phase angle, and the DC voltage, respectively. , , , , These represent small disturbance signals superimposed on active power, reference active power, DC voltage, equipment phase angle, and grid phase angle, respectively.

[0061] Eliminate formulas (4) and (5) and The following active power support indicators can be obtained, and the block diagram of the network-type SVG small signal model is as follows. Figure 5 As shown.

[0062] (6)

[0063] Plot the frequency domain curves of the active power support index under three conditions: neglecting DC voltage control, having large DC voltage control loop parameters, and having small DC voltage control loop parameters. Figure 6 As shown.

[0064] Under different control methods, the high-frequency band curves overlap, indicating that the active power response at the moment of disturbance is only related to the line impedance. In the mid-frequency band, the curves almost overlap, indicating similar inertial response capabilities. Comparing the low-frequency amplitude curves, without considering DC voltage control (blue curve), the curve slope is 20dB / decibels, indicating frequency modulation capability. Considering DC control (orange and green curves), the curve slope is 60dB / decibels, indicating no frequency modulation capability. Meanwhile, The corresponding curve (orange curve) is lower than The corresponding curve (green curve) illustrates that the larger the DC voltage controller parameters, the faster the adjustment speed, but the worse the active power support capability. The above analysis verifies the effectiveness of the active power support index proposed in this application example.

[0065] From a software perspective, in order to realize the active power response characteristic analysis of power electronic equipment during actual operation and improve the reliability of the active power response characteristic analysis, this application provides an embodiment of an active power response characteristic analysis device for power electronic equipment that implements all or part of the active power response characteristic analysis method of the aforementioned power electronic equipment. See [link to embodiment]. Figure 7 The active power response characteristic analysis device for power electronic equipment specifically includes the following components: The acquisition module 01 is used to acquire the frequency domain curve of the target power electronic device, which is a power electronic device connected to the power grid. The frequency domain curve is the amplitude-frequency characteristic curve of the ratio between the amplitude of the phase element of the modulation voltage superimposed on the disturbance signal and the amplitude of the response active power as a function of frequency. Analysis module 02 is used to perform active power response characteristic analysis of the target power electronic equipment based on the slope and amplitude of the frequency domain curve in multiple frequency bands.

[0066] The embodiments of the active power response characteristic analysis device for power electronic equipment provided in this specification can be used to execute the processing flow of the embodiments of the active power response characteristic analysis method for power electronic equipment described above. Its functions will not be repeated here, but can be referred to the detailed description of the embodiments of the active power response characteristic analysis method for power electronic equipment described above.

[0067] Figure 8 This is a schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention, such as... Figure 8 As shown, the electronic device includes: a memory 801, a processor 802, and a computer program stored in the memory 801 and executable on the processor 802. When the processor 802 executes the computer program, it implements the following method: Obtain the frequency domain curve of the target power electronic device, which is a power electronic device connected to the power grid. The frequency domain curve is the amplitude-frequency characteristic curve of the ratio between the amplitude of the phase element of the modulation voltage superimposed on the disturbance signal and the amplitude of the response active power as a function of frequency. Based on the slope and amplitude of the frequency domain curves in multiple frequency bands, the active power response characteristics of the target power electronic equipment are analyzed.

[0068] This embodiment discloses a computer program product, which includes a computer program that, when executed by a processor, implements the following method: Obtain the frequency domain curve of the target power electronic device, which is a power electronic device connected to the power grid. The frequency domain curve is the amplitude-frequency characteristic curve of the ratio between the amplitude of the phase element of the modulation voltage superimposed on the disturbance signal and the amplitude of the response active power as a function of frequency. Based on the slope and amplitude of the frequency domain curves in multiple frequency bands, the active power response characteristics of the target power electronic equipment are analyzed.

[0069] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the following method: Obtain the frequency domain curve of the target power electronic device, which is a power electronic device connected to the power grid. The frequency domain curve is the amplitude-frequency characteristic curve of the ratio between the amplitude of the phase element of the modulation voltage superimposed on the disturbance signal and the amplitude of the response active power as a function of frequency. Based on the slope and amplitude of the frequency domain curves in multiple frequency bands, the active power response characteristics of the target power electronic equipment are analyzed.

[0070] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0071] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0072] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0073] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0074] In the description of this specification, the references to terms such as "an embodiment," "a specific embodiment," "some embodiments," "for example," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for analyzing the active power response characteristics of power electronic equipment, characterized in that, include: Obtain the frequency domain curve of the target power electronic device, which is a power electronic device connected to the power grid. The frequency domain curve is the amplitude-frequency characteristic curve of the ratio between the amplitude of the phase element of the modulation voltage superimposed on the disturbance signal and the amplitude of the response active power as a function of frequency. Based on the slope and amplitude of the frequency domain curves in multiple frequency bands, the active power response characteristics of the target power electronic equipment are analyzed.

2. The method for analyzing the active power response characteristics of power electronic equipment according to claim 1, characterized in that, The acquisition of the frequency domain curve of the target power electronic device includes: Multiple frequency points within a preset frequency detection range are acquired. At each of the frequency points, a phase element of the modulation voltage is superimposed with a disturbance signal, and the active power output by the target power electronic device is detected. The frequency domain curve is obtained by fitting the phase element of the modulation voltage corresponding to each frequency point, superimposing the disturbance signal and the response active power.

3. The method for analyzing the active power response characteristics of power electronic equipment according to claim 2, characterized in that, The process of acquiring multiple frequency points within a preset frequency detection range, applying a phase element superimposed with a modulation voltage to the target power electronic device at each of the frequency points, and detecting the response active power output by the target power electronic device includes: Multiple frequency points within a preset frequency detection range are obtained, and the frequency intervals of each frequency point are the same. A phase element superimposed disturbance signal corresponding to the modulation voltage at each frequency point is applied to the target power electronic device; After applying a disturbance signal to the phase element of the modulation voltage corresponding to each frequency point, the active power output of the target power electronic device at that frequency point is detected when the power electronic device reaches the steady-state operating point.

4. The method for analyzing the active power response characteristics of power electronic equipment according to claim 2, characterized in that, The step of fitting the frequency domain curve by superimposing the disturbance signal and the response active power on the phase element of the modulation voltage corresponding to each frequency point includes: By using Fast Fourier Transform, the amplitude of the response active power and the phase element superimposed disturbance signal of the modulation voltage corresponding to each frequency point is obtained. The amplitude-frequency characteristic curve is obtained by fitting the amplitude of the disturbance signal superimposed on the active power of the response and the phase element of the modulation voltage at each frequency point.

5. The method for analyzing the active power response characteristics of power electronic equipment according to claim 1, characterized in that, The step of performing active power response characteristic analysis of the target power electronic equipment based on the slope and amplitude of the frequency domain curves in multiple frequency bands includes: Obtain the slope of the frequency domain curve in the low-frequency band, and determine whether the target power electronic device has frequency modulation capability based on the slope of the low-frequency band. The amplitude of the frequency domain curve in each frequency band is obtained, and the corresponding active power support capability level is determined based on the amplitude of each frequency band.

6. The method for analyzing the active power response characteristics of power electronic equipment according to claim 1, characterized in that, The target power electronic device is a grid-type static var generator; correspondingly, obtaining the frequency domain curve of the target power electronic device includes: Obtain the small-signal mathematical model of a grid-type static var generator; The frequency domain curve is obtained based on the small-signal mathematical model.

7. A device for analyzing the active power response characteristics of power electronic equipment, characterized in that, include: The acquisition module is used to acquire the frequency domain curve of the target power electronic device, which is a power electronic device connected to the power grid. The frequency domain curve is the amplitude-frequency characteristic curve of the ratio between the amplitude of the phase element of the modulation voltage superimposed on the disturbance signal and the amplitude of the response active power as a function of frequency. The analysis module is used to perform active power response characteristic analysis of the target power electronic equipment based on the slope and amplitude of the frequency domain curve in multiple frequency bands.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the active power response characteristic analysis method for power electronic equipment as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the active power response characteristic analysis method for power electronic equipment as described in any one of claims 1 to 6.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the active power response characteristic analysis method for power electronic equipment as described in any one of claims 1 to 6.

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