Power system oscillation source positioning method and device, electronic equipment and storage medium

Abstract

The invention provides a power system oscillation source positioning method and device, electronic equipment and a storage medium, and relates to the technical field of power system oscillation analysis, and the method comprises the steps: obtaining a three-phase voltage instantaneous sampling value and a three-phase current instantaneous sampling value of each port in a plurality of ports of a power system; based on the three-phase voltage instantaneous sampling value and the three-phase current instantaneous sampling value, calculating to obtain instantaneous total power and a steady-state direct-current power component of each port; calculating a difference value between the instantaneous total power and the steady-state direct-current power component to obtain a net power component of each port; and analyzing the net supply energy change trend of the plurality of ports based on the net power component of each port, and determining an oscillation source in the plurality of ports based on the net supply energy change trend. According to the method provided by the invention, the oscillation source criterion based on the net supply energy is more reliable, and misjudgment caused by improper removal of the direct current component is reduced.

Description

Technical Field

[0001] This invention relates to the field of power system oscillation analysis technology, and in particular to a method, apparatus, electronic device, and storage medium for locating power system oscillation sources. Background Technology

[0002] Power system oscillations are a common problem affecting the safe and stable operation of the system. Accurately and quickly locating the source of the oscillation is a prerequisite for taking effective suppression measures.

[0003] In new power systems containing numerous power electronic devices such as voltage source converters (VSCs), the dynamic interactions of the control system make oscillation phenomena more complex. These devices also exchange power during normal operation; therefore, accurately distinguishing between steady-state power transfer and oscillation energy contribution is crucial for improving the reliability of oscillation source localization. Some existing port-supply energy methods employ simple mean-removal techniques when processing the DC component, lacking a rigorous theoretical foundation and failing to guarantee accuracy under various operating conditions.

[0004] How to accurately locate the source of oscillation in the power system is a technical problem that needs to be solved. Summary of the Invention

[0005] This invention provides a method, apparatus, electronic device, and storage medium for locating oscillation sources in power systems, in order to overcome the deficiencies existing in the prior art.

[0006] This invention provides a method for locating oscillation sources in a power system, comprising the following steps: Acquire instantaneous sampled values ​​of three-phase voltage and three-phase current at each of multiple ports in the power system; Based on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current, the instantaneous total power and steady-state DC power component of each port are calculated. Calculate the difference between the instantaneous total power and the steady-state DC power component to obtain the net power component of each port; The net power component analysis of each port yields the net supply energy variation trend of the multiple ports, and the oscillation source is determined among the multiple ports based on the net supply energy variation trend.

[0007] According to a power system oscillation source location method provided by the present invention, the step of calculating the instantaneous total power and steady-state DC power component of each port based on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current includes: The instantaneous total power of each port is calculated based on the instantaneous sampled values ​​of the three-phase voltage and the three-phase current. Signal analysis is performed on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current to obtain the fundamental component amplitude and fundamental component phase angle of the voltage at each port, as well as the fundamental component amplitude and fundamental component phase angle of the current at each port. Based on the fundamental component amplitude and phase angle of the voltage at each port, and the fundamental component amplitude and phase angle of the current at each port, the steady-state DC power component of each port is calculated.

[0008] According to the present invention, a method for locating oscillation sources in a power system is provided, wherein the steady-state DC power component is realized by the following formula: in, Represents the steady-state DC power component. V 0 represents the amplitude of the fundamental component of the port voltage. I 0 indicates the amplitude of the fundamental component of the port current. θ v0 This represents the phase angle of the fundamental component of the port voltage. θ i0 This represents the phase angle of the fundamental component of the port current.

[0009] According to a power system oscillation source localization method provided by the present invention, the step of obtaining the net supply energy variation trend of the plurality of ports based on the net power component analysis of each port, and determining the oscillation source among the plurality of ports based on the net supply energy variation trend, includes: For the net power component of each port, integrate it within the target time window to obtain the corresponding net supplied energy; The net supply energy change trend of the multiple ports is obtained based on the analysis of the net supply energy of each port; Based on the net energy supply change trend of the multiple ports, the ports whose net energy supply meets the preset change conditions are identified as oscillation sources.

[0010] According to the present invention, a method for locating oscillation sources in a power system, wherein the net energy supply is achieved by the following formula: Wherein, ESP represents net energy supply, [ t 1 , t 2] represents the target time window. Represents the net power component. Indicates instantaneous total power. This represents the steady-state DC power component.

[0011] The present invention also provides a power system oscillation source location device, comprising the following modules: The data acquisition module is used to acquire the instantaneous sampled values ​​of the three-phase voltage and the three-phase current of each port in the power system. The first power calculation module is used to calculate the instantaneous total power and steady-state DC power component of each port based on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current. The second power calculation module is used to calculate the difference between the instantaneous total power and the steady-state DC power component to obtain the net power component of each port; An oscillation source location module is used to obtain the net supply energy change trend of the multiple ports based on the net power component analysis of each port, and to determine the oscillation source among the multiple ports based on the net supply energy change trend.

[0012] According to the present invention, a power system oscillation source locating device is provided, wherein the first power calculation module is specifically used for: The instantaneous total power of each port is calculated based on the instantaneous sampled values ​​of the three-phase voltage and the three-phase current. Signal analysis is performed on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current to obtain the fundamental component amplitude and fundamental component phase angle of the voltage at each port, as well as the fundamental component amplitude and fundamental component phase angle of the current at each port. Based on the fundamental component amplitude and phase angle of the voltage at each port, and the fundamental component amplitude and phase angle of the current at each port, the steady-state DC power component of each port is calculated.

[0013] According to the present invention, a power system oscillation source locating device is provided, wherein the steady-state DC power component is realized by the following formula: in, Represents the steady-state DC power component. V 0 represents the amplitude of the fundamental component of the port voltage. I 0 indicates the amplitude of the fundamental component of the port current. θ v0 This represents the phase angle of the fundamental component of the port voltage. θ i0 This represents the phase angle of the fundamental component of the port current.

[0014] The present invention also 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 any of the above-described methods for locating power system oscillation sources.

[0015] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the power system oscillation source localization method as described above.

[0016] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements any of the above-described methods for locating power system oscillation sources.

[0017] This invention provides a method, apparatus, electronic device, and storage medium for locating oscillation sources in a power system. It acquires instantaneous samples of the three-phase voltage and three-phase current at each of multiple ports in a power system. Based on these samples, it calculates the instantaneous total power and steady-state DC power component at each port. The difference between the instantaneous total power and the steady-state DC power component is calculated to obtain the net power component at each port. The net power component at each port is analyzed to determine the trend of net energy supply variation at the multiple ports, and the oscillation source is identified among these ports based on this trend. Therefore, this invention, by accurately deriving and calculating the steady-state DC power component and removing it from the instantaneous total power, makes the calculated net power component and net energy supply more accurately reflect the energy exchange related to oscillation. Due to the improved accuracy of energy calculation, the oscillation source criterion based on net energy supply is more reliable, reducing misjudgments caused by improper removal of the DC component. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this 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 this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating the power system oscillation source localization method provided by the present invention.

[0020] Figure 2 This is a complete flowchart of the power system oscillation source localization method provided by the present invention.

[0021] Figure 3 This is a schematic diagram of port power and energy changes provided by the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of the power system oscillation source locating device provided by the present invention.

[0023] Figure 5This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] The following is combined Figures 1-5 This invention describes a method, apparatus, electronic device, and storage medium for locating oscillation sources in a power system.

[0026] It should be noted that power system oscillations are a common problem affecting the safe and stable operation of the system, and accurately and quickly locating the oscillation source is a prerequisite for taking effective suppression measures. The Energy Supply on Port (ESP) method is a promising method for locating oscillation sources. Its basic idea is to identify the oscillation source by analyzing the direction and increase / decrease of energy at each port of the system during oscillation. If a port continuously injects energy into the system during oscillation, then that port is very likely related to the oscillation source.

[0027] Current port power supply calculations typically involve time integration of the net power supplied to the port, where the net power is obtained by subtracting the DC power component from the instantaneous power. The instantaneous power at the port includes not only energy exchange related to oscillation but also power transmission during steady-state system operation. This latter power is primarily generated by the fundamental voltage and current, manifesting as a DC component, and is not directly related to the system oscillation itself. Failure to accurately remove this oscillation-independent power component, i.e., the DC power component, when calculating the port power supply will affect the accuracy of ESP calculations, potentially leading to misjudgments of oscillation source location or reduced sensitivity.

[0028] Especially in new power systems containing numerous power electronic devices such as voltage source converters (VSCs), the dynamic interaction of the control system makes oscillation phenomena more complex. These devices also exchange power during normal operation, making it crucial to accurately distinguish between steady-state power transmission and oscillation energy contribution to improve the reliability of oscillation source location. Some existing port-supply energy methods use simple mean removal methods when dealing with DC components, lacking a rigorous theoretical foundation and failing to guarantee accuracy under various operating conditions. For example, while some literature studies energy structure analysis of VSC devices based on Dirac structures and port Hamiltonian theory to derive port-supply energy, the calculation of port-supply energy still lacks in-depth derivation and clear calculation formulas for specifically removing DC components. Therefore, this invention provides a power system oscillation source location method to solve at least one of the above problems.

[0029] Figure 1 This is a flowchart illustrating the power system oscillation source localization method provided by the present invention, as shown below. Figure 1 As shown, the method includes the following: Step 100: Obtain the instantaneous sampled values ​​of the three-phase voltage and the three-phase current at each of the multiple ports of the power system.

[0030] It should be noted that the power system in this embodiment can be a system containing power electronic equipment such as voltage source converters (VSCs). The port refers to the generator output port, load connection port, or grid connection port of the power electronic equipment in the power system.

[0031] Specifically, the instantaneous sampled values ​​of the three-phase voltage at each port to be analyzed in the power system are obtained. u a ( t ) , u b ( t ) , u c ( t ) and instantaneous sampled values ​​of three-phase current i a ( t ) , i b ( t ) , i c ( t These data can be obtained from the power system's measurement units (such as PMUs, digital fault recorders, etc.).

[0032] Step 200: Based on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current, calculate the instantaneous total power and steady-state DC power component of each port.

[0033] Step 200 specifically includes: Step 210: Calculate the instantaneous total power of each port based on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current.

[0034] Specifically, the instantaneous total power at the port is calculated based on the instantaneous sampled values ​​of the three-phase voltage and the three-phase current. p ( t For a three-phase system, the formula for calculating the instantaneous total power is: p ( t ) = u a ( t ) i a ( t ) + u b ( t ) i b ( t ) + u c ( t ) i c ( t ).

[0035] Step 220: Perform signal analysis on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current to obtain the fundamental component amplitude and fundamental component phase angle of the voltage at each port, and the fundamental component amplitude and fundamental component phase angle of the current at each port.

[0036] Specifically, signal analysis is performed on the instantaneous sampled values ​​of the three-phase voltage and the three-phase current to extract the amplitude of the fundamental component of the port voltage, respectively. V 0 and the phase angle of the fundamental component θ v0 and the amplitude of the fundamental component of the port current. I 0 and the phase angle of the fundamental component θ i0 Signal analysis methods can employ Fast Fourier Transform (FFT) or other effective harmonic analysis methods.

[0037] Step 230: Based on the fundamental component amplitude and phase angle of the voltage at each port, and the fundamental component amplitude and phase angle of the current at each port, calculate the steady-state DC power component of each port.

[0038] Specifically, based on the fundamental component amplitude of the port voltage extracted above... V 0 and the phase angle of the fundamental component θ v0 and the amplitude of the fundamental component of the port current. I 0 and the phase angle of the fundamental component θ i0 Calculate the steady-state DC power components generated by the fundamental voltage and fundamental current. This steady-state DC power component accurately represents the average power exchange at the port at the fundamental frequency and is not related to oscillation-dependent transient energy.

[0039] The steady-state DC power component is realized by the following formula: in, Represents the steady-state DC power component. V 0 represents the amplitude of the fundamental component of the port voltage. I 0 indicates the amplitude of the fundamental component of the port current. θ v0 This represents the phase angle of the fundamental component of the port voltage. θ i0 This represents the phase angle of the fundamental component of the port current.

[0040] Step 300: Calculate the difference between the instantaneous total power and the steady-state DC power component to obtain the net power component of each port.

[0041] Specifically, from the instantaneous total power p ( t Subtract the steady-state DC power component from the input. The net power component related to system oscillations is obtained. .Right now: This net power component It can more accurately reflect the energy throughput characteristics of the port during the oscillation process.

[0042] Step 400: Based on the net power component analysis of each port, the net supply energy change trend of the multiple ports is obtained, and the oscillation source is determined in the multiple ports based on the net supply energy change trend.

[0043] Step 400 specifically includes: Step 410: Integrate the net power component of each port within the target time window to obtain the corresponding net supply energy.

[0044] Specifically, for the net power component Within the selected target time window t 1 , tIntegrating within [2], the net energy supplied to the port, ESP, is obtained. The selected time window is typically the period of interest during which system oscillations occur.

[0045] The net energy supply is achieved through the following formula: Wherein, ESP represents net energy supply, [ t 1 , t 2] represents the target time window. Represents the net power component. Indicates instantaneous total power. This represents the steady-state DC power component.

[0046] Step 420: Based on the net supply energy analysis of each port, obtain the net supply energy change trend of the multiple ports.

[0047] Step 430: Based on the net energy supply change trend of the multiple ports, determine the ports whose net energy supply meets the preset change conditions as oscillation sources.

[0048] Specifically, by comparing the net energy supplied (ESP) values ​​at various relevant ports in the power system, ports exhibiting a continuous increasing trend in ESP within the observation window are identified as oscillation sources. A continuous increasing trend in ESP indicates that the port is continuously injecting energy into the system, consistent with the characteristics of an oscillation source. The continuous increasing trend in net energy supplied is determined by judging whether the slope of the trend is positive.

[0049] The above describes the steps of the power system oscillation source location method provided by this invention. As can be seen from the above description, the power system oscillation source location method provided by this invention involves acquiring instantaneous sampled values ​​of the three-phase voltage and three-phase current at each of multiple ports in the power system; calculating the instantaneous total power and steady-state DC power component of each port based on the instantaneous sampled values ​​of the three-phase voltage and the three-phase current; calculating the difference between the instantaneous total power and the steady-state DC power component to obtain the net power component of each port; analyzing the net power component of each port to obtain the net energy supply change trend of the multiple ports; and determining the oscillation source among the multiple ports based on the net energy supply change trend. Therefore, this invention, by accurately deriving and calculating the steady-state DC power component and removing it from the instantaneous total power, makes the calculated net power component and net energy supply more accurately reflect the energy exchange related to oscillation. Due to the improved accuracy of energy calculation, the oscillation source criterion based on net energy supply is more reliable, reducing misjudgments caused by improper removal of the DC component.

[0050] Figure 2This is a complete flowchart of the power system oscillation source localization method provided by the present invention. The following is a summary of the process. Figure 2 The present invention provides a complete description of the power system oscillation source localization method in one embodiment.

[0051] Suppose we need to perform oscillation source analysis on a port (e.g., a VSC grid connection point) in a power system.

[0052] 1. Collect the three-phase voltage of the port using measuring equipment deployed at the port. u a ( t ) , u b ( t ) , u c ( t and three-phase current i a ( t ) , i b ( t ) , i c ( t The instantaneous waveform data of the sampled frequency must satisfy the Nyquist theorem and be able to capture the oscillation frequency component of interest.

[0053] 2. For the acquired voltage and current waveform data, within a sliding time window (e.g., several fundamental frequency cycles), the fundamental amplitude of the voltage and current is calculated using the FFT algorithm. V 0 , I 0 and fundamental phase angle θ v0 , θ i0 .

[0054] 3. Using the collected instantaneous voltage and current values, calculate the instantaneous three-phase total power at this port. p ( t ) = u a ( t ) i a ( t ) + u b ( t ) i b ( t ) + u c ( t ) i c ( t ).

[0055] 4. Using the fundamental amplitude and phase angle obtained in step 2, according to the formula... Calculate the steady-state DC power component of this port within the current analysis window. .

[0056] 5. From the instantaneous total power p ( t Subtract the calculated steady-state DC power component from the input. The net power component is obtained. .

[0057] 6. Select a suitable starting time for integration. (e.g., the moment the oscillation begins) and the time it ends (At the current moment or the end of the oscillation analysis window), for the net power component By performing time integration, we can obtain the port's position at [ , Net energy supply during the period .

[0058] 7. Repeat the above steps for other ports in the system that need to be analyzed to obtain the ESP value of each port. Determine the trend of ESP changes for each port. If the ESP value of a certain port continues to increase significantly over time, then that port is identified as an oscillation source or closely related to an oscillation source.

[0059] Figure 3 This is a schematic diagram of port power and energy changes provided by the present invention. Figure 3 The diagram illustrates the power and energy changes during the above calculation process. Curve (a) represents the instantaneous total power at the port. p ( t It may fluctuate around a non-zero mean. Straight line (b) represents the fundamental DC power component calculated according to the method of the present invention. It is a relatively stable value, representing the average power at the fundamental frequency. Curve (c) represents the net power component. It is p ( t Subtract The results primarily reflect the power fluctuations related to the oscillations. Curve (d) represents the change in net supplied energy (ESP) over time. If the port is the source of the oscillation, the ESP curve will show a continuous upward trend; if the port is a "sink" absorbing oscillation energy, the ESP curve will show a continuous downward trend; if the port does not exchange much energy with the oscillation, the ESP curve may show a relatively stable characteristic.

[0060] The method of this invention accurately removes the fundamental DC power component unrelated to oscillation, allowing the ESP to more accurately reflect the true energy contribution of the port during oscillation, thereby improving the accuracy and reliability of oscillation source location. Those skilled in the art should understand that the above embodiments are merely illustrative of the principles of this invention, and adjustments can be made according to specific circumstances in practical applications, such as the selection of parameters like sampling rate, FFT window length, integration time window, and the comprehensive discrimination logic for multi-port ESP values.

[0061] The power system oscillation source localization method provided by this invention offers the following advantages: 1. Improved accuracy of energy calculation: By accurately deriving and calculating the steady-state DC power component generated by the fundamental voltage and current, and removing it from the instantaneous total power, the calculated net power component and net supplied energy more accurately reflect the energy exchange related to oscillation. 2. Enhanced reliability of oscillation source localization: Due to the improved accuracy of energy calculation, the oscillation source criterion based on net supplied energy is more reliable, reducing misjudgments caused by improper removal of the DC component. 3. More robust theoretical foundation: The calculation formula for the DC component that needs to be removed is clearly given, possessing clear physical meaning and rigorous mathematical derivation, rather than simple averaging or filtering. 4. Wider applicability: This method is also applicable to complex power systems containing power electronic devices such as VSCs, as it accurately considers the transmission of fundamental power.

[0062] The following describes the power system oscillation source locating device provided by the present invention. The power system oscillation source locating device described below can be referred to in correspondence with the power system oscillation source locating method described above.

[0063] Figure 4 This is a schematic diagram of the power system oscillation source locating device provided by the present invention, as shown below. Figure 4 As shown, the power system oscillation source locating device provided by the present invention includes: The data acquisition module 401 is used to acquire the instantaneous sampled values ​​of the three-phase voltage and the three-phase current of each port in the power system. The first power calculation module 402 is used to calculate the instantaneous total power and steady-state DC power component of each port based on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current. The second power calculation module 403 is used to calculate the difference between the instantaneous total power and the steady-state DC power component to obtain the net power component of each port; The oscillation source location module 404 is used to obtain the net supply energy change trend of the multiple ports based on the net power component analysis of each port, and to determine the oscillation source among the multiple ports based on the net supply energy change trend.

[0064] The power system oscillation source location device provided by this invention acquires instantaneous sampling values ​​of three-phase voltage and three-phase current at each of multiple ports in a power system; calculates the instantaneous total power and steady-state DC power component of each port based on the instantaneous sampling values ​​of the three-phase voltage and the three-phase current; calculates the difference between the instantaneous total power and the steady-state DC power component to obtain the net power component of each port; analyzes the net power component of each port to obtain the net energy supply change trend of the multiple ports, and determines the oscillation source among the multiple ports based on the net energy supply change trend. Therefore, this invention, by accurately deriving and calculating the steady-state DC power component and removing it from the instantaneous total power, makes the calculated net power component and net energy supply more accurately reflect the energy exchange related to oscillation. Due to the improved accuracy of energy calculation, the oscillation source criterion based on net energy supply is more reliable, reducing misjudgments caused by improper removal of the DC component.

[0065] Based on the above embodiments, in this embodiment, the first power calculation module 402 is specifically used for: The instantaneous total power of each port is calculated based on the instantaneous sampled values ​​of the three-phase voltage and the three-phase current. Signal analysis is performed on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current to obtain the fundamental component amplitude and fundamental component phase angle of the voltage at each port, as well as the fundamental component amplitude and fundamental component phase angle of the current at each port. Based on the fundamental component amplitude and phase angle of the voltage at each port, and the fundamental component amplitude and phase angle of the current at each port, the steady-state DC power component of each port is calculated.

[0066] Based on the above embodiments, in this embodiment, the steady-state DC power component is realized by the following formula: in, Represents the steady-state DC power component. V 0 represents the amplitude of the fundamental component of the port voltage. I 0 indicates the amplitude of the fundamental component of the port current. θ v0 This represents the phase angle of the fundamental component of the port voltage. θ i0 This represents the phase angle of the fundamental component of the port current.

[0067] Based on the above embodiments, in this embodiment, the oscillation source positioning module 404 is specifically used for: For the net power component of each port, integrate it within the target time window to obtain the corresponding net supplied energy; The net supply energy change trend of the multiple ports is obtained based on the analysis of the net supply energy of each port; Based on the net energy supply change trend of the multiple ports, the ports whose net energy supply meets the preset change conditions are identified as oscillation sources.

[0068] Based on the above embodiments, in this embodiment, the net energy supply is achieved through the following formula: Wherein, ESP represents net energy supply, [ t 1 , t 2] represents the target time window. Represents the net power component. Indicates instantaneous total power. This represents the steady-state DC power component.

[0069] Figure 5 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 5 As shown, the electronic device can be a robot or other electronic device. This electronic device may include: a processor 510, a communication interface 520, a memory 530, and a communication bus 540. The processor 510, communication interface 520, and memory 530 communicate with each other via the communication bus 540. The processor 510 can call logical instructions from the memory 530 to execute a power system oscillation source localization method, including: Acquire instantaneous sampled values ​​of three-phase voltage and three-phase current at each of multiple ports in the power system; Based on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current, the instantaneous total power and steady-state DC power component of each port are calculated. Calculate the difference between the instantaneous total power and the steady-state DC power component to obtain the net power component of each port; The net power component analysis of each port yields the net supply energy variation trend of the multiple ports, and the oscillation source is determined among the multiple ports based on the net supply energy variation trend.

[0070] Furthermore, the logical instructions in the aforementioned memory 530 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in at least one embodiment of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0071] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program, the computer program being able to be stored on a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer being able to execute the power system oscillation source localization method provided by the above methods, including: Acquire instantaneous sampled values ​​of three-phase voltage and three-phase current at each of multiple ports in the power system; Based on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current, the instantaneous total power and steady-state DC power component of each port are calculated. Calculate the difference between the instantaneous total power and the steady-state DC power component to obtain the net power component of each port; The net power component analysis of each port yields the net supply energy variation trend of the multiple ports, and the oscillation source is determined among the multiple ports based on the net supply energy variation trend.

[0072] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the power system oscillation source localization method provided by the above methods, including: Acquire instantaneous sampled values ​​of three-phase voltage and three-phase current at each of multiple ports in the power system; Based on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current, the instantaneous total power and steady-state DC power component of each port are calculated. Calculate the difference between the instantaneous total power and the steady-state DC power component to obtain the net power component of each port; The net power component analysis of each port yields the net supply energy variation trend of the multiple ports, and the oscillation source is determined among the multiple ports based on the net supply energy variation trend.

[0073] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0074] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for locating oscillation sources in a power system, characterized in that, include: Acquire instantaneous sampled values ​​of three-phase voltage and three-phase current at each of multiple ports in the power system; Based on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current, the instantaneous total power and steady-state DC power component of each port are calculated. Calculate the difference between the instantaneous total power and the steady-state DC power component to obtain the net power component of each port; The net power component analysis of each port yields the net supply energy variation trend of the multiple ports, and the oscillation source is determined among the multiple ports based on the net supply energy variation trend.

2. The method for locating power system oscillation sources according to claim 1, characterized in that, The calculation of the instantaneous total power and steady-state DC power component of each port based on the instantaneous sampled values ​​of the three-phase voltage and the three-phase current includes: The instantaneous total power of each port is calculated based on the instantaneous sampled values ​​of the three-phase voltage and the three-phase current. Signal analysis is performed on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current to obtain the fundamental component amplitude and fundamental component phase angle of the voltage at each port, as well as the fundamental component amplitude and fundamental component phase angle of the current at each port. Based on the fundamental component amplitude and phase angle of the voltage at each port, and the fundamental component amplitude and phase angle of the current at each port, the steady-state DC power component of each port is calculated.

3. The method for locating power system oscillation sources according to any one of claims 1 or 2, characterized in that, The steady-state DC power component is realized by the following formula: in, Represents the steady-state DC power component. V 0 indicates the amplitude of the fundamental component of the port voltage. I 0 indicates the amplitude of the fundamental component of the port current. θ v0 This represents the phase angle of the fundamental component of the port voltage. θ i0 This represents the phase angle of the fundamental component of the port current.

4. The method for locating power system oscillation sources according to claim 1, characterized in that, The process of obtaining the net supply energy variation trend of the multiple ports based on the net power component analysis of each port, and determining the oscillation source among the multiple ports based on the net supply energy variation trend, includes: For the net power component of each port, integrate it within the target time window to obtain the corresponding net supplied energy; The net supply energy change trend of the multiple ports is obtained based on the analysis of the net supply energy of each port; Based on the net energy supply change trend of the multiple ports, the ports whose net energy supply meets the preset change conditions are identified as oscillation sources.

5. The method for locating a power system oscillation source according to any one of claims 1 or 4, characterized in that, The net energy supply is achieved through the following formula: Wherein, ESP represents net energy supply, [ t 1 , t 2] represents the target time window. Represents the net power component. Indicates instantaneous total power. This represents the steady-state DC power component.

6. A device for locating oscillation sources in a power system, characterized in that, include: The data acquisition module is used to acquire the instantaneous sampled values ​​of the three-phase voltage and the three-phase current of each port in the power system. The first power calculation module is used to calculate the instantaneous total power and steady-state DC power component of each port based on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current. The second power calculation module is used to calculate the difference between the instantaneous total power and the steady-state DC power component to obtain the net power component of each port; An oscillation source location module is used to obtain the net supply energy change trend of the multiple ports based on the net power component analysis of each port, and to determine the oscillation source among the multiple ports based on the net supply energy change trend.

7. The power system oscillation source locating device according to claim 6, characterized in that, The first power calculation module is specifically used for: The instantaneous total power of each port is calculated based on the instantaneous sampled values ​​of the three-phase voltage and the three-phase current. Signal analysis is performed on the instantaneous sampled values ​​of the three-phase voltage and the instantaneous sampled values ​​of the three-phase current to obtain the fundamental component amplitude and fundamental component phase angle of the voltage at each port, as well as the fundamental component amplitude and fundamental component phase angle of the current at each port. Based on the fundamental component amplitude and phase angle of the voltage at each port, and the fundamental component amplitude and phase angle of the current at each port, the steady-state DC power component of each port is calculated.

8. The power system oscillation source locating device according to any one of claims 6 or 7, characterized in that, The steady-state DC power component is realized by the following formula: in, Represents the steady-state DC power component. V 0 indicates the amplitude of the fundamental component of the port voltage. I 0 indicates the amplitude of the fundamental component of the port current. θ v0 This represents the phase angle of the fundamental component of the port voltage. θ i0 This represents the phase angle of the fundamental component of the port current.

9. 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 power system oscillation source localization method as described in any one of claims 1 to 5.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the power system oscillation source localization method as described in any one of claims 1 to 5.

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