Method and device for positioning sub-hyper-synchronous oscillation disturbance source

Abstract

The invention provides a sub-hyper-synchronous oscillation disturbance source positioning method and device, and relates to the technical field of power systems, and the method applied to a substation in a power system comprises the steps: processing an obtained voltage and current instantaneous value sequence of at least one line, and obtaining a processing result; for each line, determining sub-hyper-synchronous power and energy flow power based on the processing result of the line; sending each processing result, each super-synchronous power and each energy flow power to a master station in the power system; and the master station is used for determining an oscillation type based on each processing result, and positioning an oscillation disturbance source based on the oscillation type, each super-synchronous power and each energy flow power. Through the processing of the voltage and current instantaneous value sequence by the substation and the determination of the sub-super synchronous power and the energy flow power, the main station can position the oscillation disturbance source, the accurate positioning of the oscillation disturbance source from the oscillation mechanism level is realized, and the method can adapt to different types of oscillation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, and in particular to a method and device for locating a sub-synchronous oscillation disturbance source. BACKGROUND

[0002] With the large-scale integration of new energy into the power grid through power electronic interfaces, the adverse interaction between power electronic devices and between power electronic power sources and the power grid has induced many new types of power system stability problems, one of which is sub-synchronous oscillation.

[0003] Existing researches roughly divide the new energy-induced sub-synchronous oscillation into two categories: one is the sub-synchronous oscillation problem induced by the interaction between photovoltaic and direct-drive wind turbine full-power converter phase-locked loop and weak power grid; the other is the induction generator effect induced by the interaction between double-fed wind turbine and series compensation. Both of them have great differences in internal mechanism and device types involved, but both types of oscillation have many characteristics such as involving many electrical devices, having wide propagation range, time-varying frequency and multi-modal, and may induce a series of problems such as new energy unit off-grid, thermal power unit resonance, device overvoltage / current, etc., which seriously affect power quality and threaten the safe and stable operation of the power system.

[0004] After the oscillation occurs, in order to avoid further propagation of the oscillation and cause greater damage, effective emergency control measures need to be taken. Precise disturbance source positioning is the basis for emergency control. The current mainstream measurement-based sub-synchronous oscillation disturbance source positioning methods are mainly sub-synchronous power method and transient energy flow method, both of which have the advantages of clear physical meaning, simple structure and small calculation load. However, the adaptability of the two methods to different oscillation mechanisms and the relationship between the two methods are not clear.

[0005] Therefore, how to provide a comprehensive sub-synchronous oscillation disturbance source positioning method considering different oscillation mechanisms is a technical problem to be solved. SUMMARY

[0006] The present application provides a sub-synchronous oscillation disturbance source positioning method and device to solve the problem of how to provide a comprehensive sub-synchronous oscillation disturbance source positioning method considering different oscillation mechanisms.

[0007] In a first aspect, the present application provides a method for locating a sub-synchronous oscillation disturbance source, applied to a substation in a power system, comprising: processing the obtained voltage and current instantaneous value sequences of at least one line to obtain processing results; For each of the lines, based on the processing results of the line, determine the sub-synchronous power and energy flow power; The processing results, the sub-super synchronous powers and the energy flow powers are sent to a master station in the power system; the master station is configured to determine an oscillation type based on the processing results, and locate an oscillation disturbance source based on the oscillation type, the sub-super synchronous powers and the energy flow powers.

[0008] According to the method, the processing results include the voltage, the current, the angle of the voltage and the angle of the current of the sub-synchronous frequency, and the voltage, the current, the angle of the voltage and the angle of the current of the super-synchronous frequency complementary to the sub-synchronous frequency. The determination of the sub-super synchronous power and the energy flow power based on the processing results includes: The active power of a sub-synchronous component is calculated based on the voltage, the current, the angle of the voltage and the angle of the current of the sub-synchronous frequency. The active power of a super-synchronous component is calculated based on the voltage, the current, the angle of the voltage and the angle of the current of the super-synchronous frequency. The sub-super synchronous power and the energy flow power are respectively calculated based on the active power of the sub-synchronous component and the active power of the super-synchronous component.

[0009] In a second aspect, the application provides a method for locating a sub-super synchronous oscillation disturbance source, which is applied to a master station in a power system, and includes: The master station receives processing results, sub-super synchronous powers and energy flow powers of at least one line from a sub-station in the power system; the processing results are obtained by processing voltage and current instantaneous value sequences of each line; the sub-super synchronous powers and the energy flow powers are obtained based on the processing results; An oscillation type is determined based on the processing results. An oscillation disturbance source is located based on the oscillation type, the sub-super synchronous powers and the energy flow powers.

[0010] According to the method, the processing results include the current of the sub-synchronous frequency and the current of the super-synchronous frequency complementary to the sub-synchronous frequency. The determination of the oscillation type based on the processing results includes: It is determined whether the current of the sub-synchronous frequency and the current of the super-synchronous frequency of each line satisfy a preset condition based on the current of the sub-synchronous frequency and the current of the super-synchronous frequency of each line. In the case that the current of the sub-synchronous frequency and the current of the super-synchronous frequency satisfy the preset condition, the line is determined as a target line. If the number of target lines is less than a preset threshold, the oscillation type is determined to be an oscillation dominated by the induction generator of the doubly fed wind turbine; If the number of target lines is greater than or equal to the preset threshold, the oscillation type is determined to be an oscillation dominated by the converter phase-locked loop.

[0011] According to the present invention, a method for locating a sub-supersynchronous oscillation disturbance source includes locating the oscillation disturbance source based on the oscillation type, each sub-supersynchronous power, and each energy flow power, comprising: In the case where the oscillation type is dominated by the induction generator of the doubly fed wind turbine, the source of the oscillation disturbance is located based on the sub-supersynchronous power of each of the above. In the case where the oscillation type is dominated by the converter phase-locked loop, the oscillation disturbance source is located based on the power of each energy flow.

[0012] According to the present invention, a method for locating a sub-supersynchronous oscillation disturbance source, wherein locating the oscillation disturbance source based on each of the sub-supersynchronous powers includes: The maximum sub-supersynchronous power is determined from all the sub-supersynchronous powers; The doubly fed wind turbine of the line corresponding to the maximum subsynchronous power is identified as the source of oscillation disturbance.

[0013] According to the present invention, a method for locating a sub-supersynchronous oscillation disturbance source, wherein locating the oscillation disturbance source based on the power of each energy flow includes: Determine the maximum energy flow power from each of the energy flow powers; The converter phase-locked loop of the line corresponding to the maximum power flow is identified as the source of oscillation disturbance.

[0014] According to the method for locating a subsynchronous oscillation disturbance source provided by the present invention, the processing result further includes the voltage, voltage angle, and current angle of the subsynchronous frequency, as well as the voltage, voltage angle, and current angle of the supersynchronous frequency that is complementary to the subsynchronous frequency.

[0015] Thirdly, the present invention also provides a sub-supersynchronous oscillation disturbance source location device, applied to a substation in a power system, comprising: The processing module is used to process the acquired instantaneous voltage and current value sequences of at least one line to obtain the processing results. The first determining module is used to determine the sub-supersynchronous power and energy flow power for each of the lines based on the processing results of the lines. The transmitting module is used to transmit the processing results, the sub-supersynchronous power, and the energy flow power to the master station in the power system; the master station is used to determine the oscillation type based on the processing results, and to locate the oscillation disturbance source based on the oscillation type, the sub-supersynchronous power, and the energy flow power.

[0016] Fourthly, the present invention also provides a sub-supersynchronous oscillation disturbance source location device, applied to a master station in a power system, comprising: A receiving module is configured to receive processing results, sub-supersynchronous power, and energy flow power of at least one line transmitted by a substation in a power system; wherein the processing results are obtained by processing the acquired instantaneous voltage and current value sequences of each of the lines respectively; the sub-supersynchronous power and the energy flow power are both obtained based on the processing results; The second determining module is used to determine the oscillation type based on the processing results. The positioning module is used to locate the oscillation disturbance source based on the oscillation type, the sub-supersynchronous power, and the energy flow power.

[0017] Fifthly, 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 the sub-supersynchronous oscillation disturbance source localization method as described in any of the first aspects, or to implement the sub-supersynchronous oscillation disturbance source localization method as described in any of the second aspects.

[0018] In a sixth 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 sub-supersynchronous oscillation disturbance source localization method as described in any of the first aspects, or implements the sub-supersynchronous oscillation disturbance source localization method as described in any of the second aspects.

[0019] In a seventh aspect, the present invention also provides a computer program product, comprising a computer program that, when executed by a processor, implements the sub-supersynchronous oscillation disturbance source localization method as described in any of the first aspects, or implements the sub-supersynchronous oscillation disturbance source localization method as described in any of the second aspects.

[0020] The present invention provides a method and apparatus for locating sub-supersynchronous oscillation disturbance sources. In a power system, a substation processes the instantaneous voltage and current value sequences of at least one line to obtain processing results. For each line, based on the processing results, the sub-supersynchronous power and energy flow power are determined. The processing results, sub-supersynchronous power, and energy flow power are then transmitted to a master station in the power system. The master station determines the oscillation type based on the processing results and locates the oscillation disturbance source based on the oscillation type, sub-supersynchronous power, and energy flow power. By processing the instantaneous voltage and current value sequences and determining the sub-supersynchronous power and energy flow power at the substation, the master station can determine the oscillation type based on the processing results and locate the oscillation disturbance source based on the oscillation type, sub-supersynchronous power, and energy flow power. This achieves accurate location of the oscillation disturbance source from the oscillation mechanism level and can adapt to different types of oscillations. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is one of the flowcharts illustrating the sub-supersynchronous oscillation disturbance source localization method provided by the present invention.

[0023] Figure 2 This is the second flowchart of the sub-supersynchronous oscillation disturbance source localization method provided by the present invention.

[0024] Figure 3 This is a schematic diagram of the oscillation of the wind power transmission system provided by the present invention.

[0025] Figure 4 This is one of the structural schematic diagrams of the sub-supersynchronous oscillation disturbance source positioning device provided by the present invention.

[0026] Figure 5 This is the second schematic diagram of the sub-supersynchronous oscillation disturbance source positioning device provided by the present invention.

[0027] Figure 6 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0028] 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.

[0029] The following is combined Figures 1-3 The present invention describes a method for locating sub-supersynchronous oscillation disturbance sources.

[0030] Figure 1 This is one of the flowcharts illustrating the sub-supersynchronous oscillation disturbance source localization method provided by the present invention, such as... Figure 1 As shown, this method, applied to a substation in a power system, includes the following steps 101-103.

[0031] Step 101: Process the instantaneous voltage and current value sequences of at least one line to obtain the processing results.

[0032] It should be noted that the sub-supersynchronous oscillation disturbance source localization method provided by this invention can be applied to scenarios involving the localization of sub-supersynchronous oscillation disturbance sources in power systems. The executing entity of this method can be a sub-supersynchronous oscillation disturbance source localization device, such as an electronic device, a substation, a master station, or a control module within that device for executing the method. The master station, as the control center, is typically located in the power dispatch center, where it remotely monitors, issues commands, and processes data from multiple substations. Substations are controlled stations, monitored and controlled by the master station.

[0033] The substation obtains the instantaneous voltage and current value sequences of at least one line from the measurement equipment. It then processes these sequences using a Fast Fourier Transform (FFT) to obtain the processing results. These results include the subsynchronous frequency. voltage Current Voltage angle Angle with current and the subsynchronization frequency Complementary supersynchronous frequencies voltage Current Voltage angle Angle with current ; , This indicates the fundamental frequency.

[0034] Step 102: For each of the lines, determine the sub-supersynchronous power and energy flow power based on the processing results of the line.

[0035] Specifically, for each line, the substation can determine the sub-supersynchronous power of that line based on the processing results for that line. and power flow .

[0036] Step 103: Send the processing results, the sub-supersynchronous power, and the energy flow power to the master station in the power system; the master station is used to determine the oscillation type based on the processing results, and locate the oscillation disturbance source based on the oscillation type, the sub-supersynchronous power, and the energy flow power.

[0037] Specifically, the substation sends the processing results, supersynchronous power, and energy flow power to the master station in the power system. The master station receives these data and, based on them, determines the oscillation type: either oscillation dominated by the induction generator of the doubly-fed induction generator (DFIG) or oscillation dominated by the converter's phase-locked loop (PLL). The master station then locates the source of the oscillation disturbance based on the oscillation type, supersynchronous power, and energy flow power.

[0038] The present invention provides a method for locating sub-supersynchronous oscillation disturbance sources. In this method, a substation in a power system processes the instantaneous voltage and current value sequences of at least one line to obtain processing results. For each line, based on the processing results, the sub-supersynchronous power and energy flow power are determined. The processing results, sub-supersynchronous power, and energy flow power are then transmitted to the master station in the power system. The master station determines the oscillation type based on the processing results and locates the oscillation disturbance source based on the oscillation type, sub-supersynchronous power, and energy flow power. By processing the instantaneous voltage and current value sequences and determining the sub-supersynchronous power and energy flow power at the substation, the master station can determine the oscillation type based on the processing results and locate the oscillation disturbance source based on the oscillation type, sub-supersynchronous power, and energy flow power. This achieves accurate location of the oscillation disturbance source from the oscillation mechanism level and can adapt to different types of oscillations.

[0039] Optionally, the processing results include the voltage, current, voltage angle, and current angle at the subsynchronous frequency, and the voltage, current, voltage angle, and current angle at the supersynchronous frequency complementary to the subsynchronous frequency; the specific implementation of step 102 includes: (1) Calculate the active power of the subsynchronous component based on the voltage, the current, the angle of the voltage and the angle of the current at the subsynchronous frequency.

[0040] Specifically, the substation is based on the subsynchronization frequency. voltage Current Voltage angle Angle with current The active power of the subsynchronous component is calculated using formula (1). .

[0041] (1) (2) Calculate the active power of the supersynchronous component based on the voltage, the current, the angle of the voltage and the angle of the current at the supersynchronous frequency.

[0042] Specifically, the substation is based on the supersynchronous frequency. voltage Current Voltage angle Angle with current The active power of the supersynchronous component is calculated using formula (2). .

[0043] (2) It should be noted that there is no specific order between steps (1) and (2) above. You can execute step (1) first and then step (2); or you can execute step (2) first and then step (1).

[0044] (3) Calculate the subsynchronous power and the energy flow power based on the active power of the subsynchronous component and the active power of the supersynchronous component.

[0045] Specifically, active power based on subsynchronous components Active power of supersynchronous components The sub-supersynchronous power SSP and energy flow power are calculated using formulas (3) and (4) respectively. .

[0046] (3) (4) in, , This indicates the torsional vibration frequency.

[0047] Figure 2 This is the second flowchart illustrating the sub-supersynchronous oscillation disturbance source localization method provided by the present invention, as shown below. Figure 2 As shown, this method is applied to the master station in a power system and includes the following steps 201-203.

[0048] Step 201: Receive the processing results, sub-supersynchronous power, and energy flow power of at least one line sent by a substation in the power system; wherein, the processing results are obtained by processing the voltage and current instantaneous value sequences of each of the lines respectively; the sub-supersynchronous power and the energy flow power are both obtained based on the processing results.

[0049] Specifically, the application in a power system involves a master station receiving processing results, subsynchronous power, and energy flow power from at least one line transmitted by a substation within the power system. The processing results are obtained by processing the acquired instantaneous voltage and current value sequences of each line. Specifically, the substation obtains the instantaneous voltage and current value sequences of at least one line from measurements, and then processes these sequences using FFT to obtain the processing results. The processing results include: subsynchronous frequency. voltage Current Voltage angle Angle with current and the subsynchronization frequency Complementary supersynchronous frequencies voltage Current Voltage angle Angle with current ; , This indicates the fundamental frequency.

[0050] Both the subsynchronous power and energy flow power are obtained based on the processing results, that is, the substation is based on the subsynchronous frequency. voltage Current Voltage angle Angle with current The active power of the subsynchronous component is calculated using the above formula (1). Substation based on supersynchronous frequency voltage Current Voltage angle Angle with current The active power of the supersynchronous component is calculated using the above formula (2). ; and then based on the active power of the subsynchronous component Active power of supersynchronous components The sub-supersynchronous power SSP and energy flow power are calculated using the above formulas (3) and (4), respectively. .

[0051] Step 202: Based on the processing results, determine the oscillation type.

[0052] Specifically, the main station can determine the oscillation type based on the processing results; the oscillation type is either oscillation dominated by the induction generator of the doubly fed wind turbine or oscillation dominated by the phase-locked loop of the converter.

[0053] Step 203: Based on the oscillation type, the sub-supersynchronous power, and the energy flow power, locate the oscillation disturbance source.

[0054] Specifically, the main station can locate the source of oscillation disturbance based on the oscillation type, the supersynchronous power of each substation, and the power of each energy flow.

[0055] The present invention provides a method for locating sub-supersynchronous oscillation disturbance sources. In this method, a master station in a power system receives processing results, sub-supersynchronous power, and energy flow power from at least one line transmitted by a substation in the power system. The processing results are obtained by processing the instantaneous voltage and current value sequences of each line. The sub-supersynchronous power and energy flow power are both obtained based on the processing results. Based on these processing results, the oscillation type is determined. Based on the oscillation type, the sub-supersynchronous power, and the energy flow power, the oscillation disturbance source is located. By using the processing results obtained from processing the instantaneous voltage and current value sequences of each line, the master station determines the oscillation type and locates the oscillation disturbance source based on the oscillation type, sub-supersynchronous power, and energy flow power. This method achieves accurate location of the oscillation disturbance source from the oscillation mechanism level and can adapt to different types of oscillations.

[0056] Optionally, the processing result includes the current at the subsynchronous frequency and the current at the supersynchronous frequency, which is complementary to the subsynchronous frequency; the specific implementation of step 202 includes: (a) Based on the current at each of the subsynchronous frequencies and the current at each of the supersynchronous frequencies, determine whether the current at the subsynchronous frequency and the current at the supersynchronous frequency of each line meet the preset conditions.

[0057] Specifically, the processing results include the current at the subsynchronous frequency and the current at the supersynchronous frequency, which is complementary to the subsynchronous frequency. The processing results may also include the voltage, voltage angle, and current angle at the subsynchronous frequency, as well as the voltage, voltage angle, and current angle at the supersynchronous frequency, which is complementary to the subsynchronous frequency. The preset condition is the current at the supersynchronous frequency of each line. Current greater than subsynchronous frequency 2 / 3, that is .

[0058] (b) If the current at the subsynchronous frequency and the current at the supersynchronous frequency satisfy the preset conditions, the line is determined as the target line.

[0059] Specifically, for each line, if the current at the subsynchronous frequency of that line... and supersynchronous frequency The current satisfies If so, then that route is identified as the target route.

[0060] (c) If the number of target lines is less than a preset threshold, the oscillation type is determined to be an oscillation dominated by the induction generator of the doubly fed wind turbine.

[0061] Specifically, the preset threshold is a pre-set threshold, for example, 75%. When the number of target lines is less than the preset threshold, that is, when the current at the subsynchronous frequency and the current at the supersynchronous frequency on a small number of lines meet or do not meet the threshold... It can be determined that the oscillation type is dominated by the induction generator of the doubly fed wind turbine.

[0062] (d) If the number of target lines is greater than or equal to the preset threshold, the oscillation type is determined to be an oscillation dominated by the converter phase-locked loop.

[0063] Specifically, when the number of target lines is greater than or equal to a preset threshold, that is, when the current at the subsynchronous frequency and the current at the supersynchronous frequency on most lines satisfy... It can be determined that the oscillation type is dominated by the converter phase-locked loop.

[0064] Optionally, the specific implementation of step 203 above includes: In the case where the oscillation type is dominated by the induction generator of the doubly fed wind turbine, the oscillation disturbance source is located based on the sub-supersynchronous power of each of the above. In the case where the oscillation type is dominated by the phase-locked loop of the converter, the oscillation disturbance source is located based on the energy flow power of each of the above.

[0065] Specifically, when the oscillation type is dominated by the induction generator of the doubly-fed wind turbine, the sub-supersynchronous power method is selected, that is, based on the sub-supersynchronous power, a search algorithm is applied to locate the oscillation disturbance source. When the oscillation type is dominated by the converter phase-locked loop, the transient energy flow method is selected, that is, based on the energy flow power, a search algorithm is applied to locate the oscillation disturbance source.

[0066] Optionally, locating the oscillation disturbance source based on each of the sub-supersynchronous powers includes: The maximum sub-supersynchronous power is determined from all the sub-supersynchronous powers; the doubly fed wind turbine of the line corresponding to the maximum sub-supersynchronous power is determined as the source of oscillation disturbance.

[0067] Specifically, the maximum sub-supersynchronous power is determined from each sub-supersynchronous power, that is, the sub-supersynchronous power with the largest value is determined from multiple sub-supersynchronous powers; the doubly fed wind turbine of the line corresponding to the maximum sub-supersynchronous power is determined as the source of oscillation disturbance.

[0068] Optionally, locating the oscillation disturbance source based on the power of each of the energy flows includes: The maximum energy flow power is determined from all the energy flow powers; the phase-locked loop of the converter of the line corresponding to the maximum energy flow power is determined as the source of oscillation disturbance.

[0069] Specifically, the maximum energy flow power is determined from each energy flow power, that is, the energy flow power with the largest value is determined from multiple energy flow power; the converter phase-locked loop of the line corresponding to the maximum energy flow power is determined as the source of oscillation disturbance.

[0070] The following is a detailed description of the sub-supersynchronous oscillation disturbance source localization method provided by the present invention using a specific embodiment.

[0071] Figure 3 This is a schematic diagram of the oscillation of the wind power transmission system provided by the present invention, as shown below. Figure 3 As shown, the simulation of a wind power transmission system oscillation in a certain region was built using the electromagnetic transient simulation software (Power Systems Computer Aided Design, PSCAD). The instantaneous voltage and current value sequences obtained by the substation from the measurements were used to extract the non-fundamental frequency component, i.e., the voltage at the subsynchronous frequency of 10.585Hz. Current Phase (i.e., the angle of voltage) Angle with current ), and the voltage at the supersynchronous frequency of 89.41432Hz, which is complementary to the subsynchronous frequency. Current Phase (i.e., the angle of voltage) Angle with current The substation is based on the subsynchronous frequency. voltage Current Voltage angle Angle with current The active power of the subsynchronous component is calculated using the above formula (1). Based on supersynchronous frequency voltage Current Voltage angle Angle with current The active power of the supersynchronous component is calculated using the above formula (2). Active power based on subsynchronous components Active power of supersynchronous components The sub-supersynchronous power SSP and energy flow power are calculated using formulas (3) and (4) respectively. The substation sends the processing results, supersynchronous power, and energy flow power to the master station in the power system.

[0072] The master station summarizes the processing results, sub-supersynchronous power, and energy flow power sent by the sub-stations, as shown in Table 1. Table 1 shows the sub-supersynchronous current and sub-supersynchronous power on each line.

[0073] Table 1. Sub-supersynchronous current and sub-supersynchronous power on each line

[0074] As shown in Table 1, the amplitude of the supersynchronous current applied to all lines is much smaller than that of the subsynchronous current. Therefore, this oscillation type is considered to be caused by the induction generator effect induced by the interaction between the doubly fed induction generator (DFIG) and the series compensation capacitor. Based on the oscillation mechanism, the subsynchronous power method is selected as the disturbance source location method. According to the search algorithm for disturbance sources: search all buses (lines) that emit positive subsynchronous power, which in this case are 7 doubly fed induction generators (DFIGs), and consider them as the initial disturbance sources; select the DFIG that emits the largest subsynchronous power, i.e., DFIG6, as the disturbance source.

[0075] The sub-supersynchronous oscillation disturbance source location device provided by the present invention will be described below. The sub-supersynchronous oscillation disturbance source location device described below can be referred to in correspondence with the sub-supersynchronous oscillation disturbance source location method described above.

[0076] Figure 4 This is one of the structural schematic diagrams of the sub-supersynchronous oscillation disturbance source positioning device provided by the present invention, such as... Figure 4 As shown, the subsynchronous oscillation disturbance source location device 400, applied to a substation in a power system, includes: a processing module 401, a first determining module 402, and a transmitting module 403; wherein, Processing module 401 is used to process the acquired instantaneous voltage and current value sequences of at least one line respectively to obtain processing results; The first determining module 402 is used to determine the sub-supersynchronous power and energy flow power for each of the lines based on the processing results of the lines. The sending module 403 is used to send the processing results, the sub-supersynchronous power, and the energy flow power to the master station in the power system; the master station is used to determine the oscillation type based on the processing results, and locate the oscillation disturbance source based on the oscillation type, the sub-supersynchronous power, and the energy flow power.

[0077] The sub-supersynchronous oscillation disturbance source location device provided by this invention processes the instantaneous voltage and current value sequences of at least one line to obtain processing results. For each line, based on the processing results, the sub-supersynchronous power and energy flow power are determined. The processing results, sub-supersynchronous power, and energy flow power are then transmitted to the master station in the power system. The master station determines the oscillation type based on the processing results and locates the oscillation disturbance source based on the oscillation type, sub-supersynchronous power, and energy flow power. By processing the instantaneous voltage and current value sequences and determining the sub-supersynchronous power and energy flow power, the master station can determine the oscillation type based on the processing results and locate the oscillation disturbance source based on the oscillation type, sub-supersynchronous power, and energy flow power. This achieves accurate location of the oscillation disturbance source from the oscillation mechanism level and can adapt to different types of oscillations.

[0078] Optionally, the processing results include the voltage, current, voltage angle, and current angle at the subsynchronous frequency, and the voltage, current, voltage angle, and current angle at the supersynchronous frequency complementary to the subsynchronous frequency; the first determining module 402 is specifically used for: The active power of the subsynchronous component is calculated based on the voltage, the current, the angle of the voltage, and the angle of the current at the subsynchronous frequency. The active power of the supersynchronous component is calculated based on the voltage, the current, the angle of the voltage, and the angle of the current at the supersynchronous frequency. Based on the active power of the subsynchronous component and the active power of the supersynchronous component, the subsynchronous supersynchronous power and the energy flow power are calculated respectively.

[0079] Figure 5 This is the second schematic diagram of the sub-supersynchronous oscillation disturbance source locating device provided by the present invention, as shown below. Figure 5 As shown, the sub-supersynchronous oscillation disturbance source locating device 500, applied to the master station in a power system, includes: a receiving module 501, a second determining module 502, and a locating module 503; wherein, The receiving module 501 is used to receive the processing results, sub-supersynchronous power, and energy flow power of at least one line sent by a substation in the power system; wherein, the processing results are obtained by processing the voltage and current instantaneous value sequences of each of the lines respectively; the sub-supersynchronous power and the energy flow power are both obtained based on the processing results; The second determining module 502 is used to determine the oscillation type based on the processing results. The positioning module 503 is used to locate the oscillation disturbance source based on the oscillation type, the sub-supersynchronous power, and the energy flow power.

[0080] The sub-supersynchronous oscillation disturbance source location device provided by this invention receives processing results, sub-supersynchronous power, and energy flow power of at least one line sent by a substation in a power system. The processing results are obtained by processing the instantaneous voltage and current value sequences of each line. The sub-supersynchronous power and energy flow power are both obtained based on the processing results. Based on each processing result, the oscillation type is determined. Based on the oscillation type, the sub-supersynchronous power, and the energy flow power, the oscillation disturbance source is located. By determining the oscillation type based on the processing results obtained by the substation from processing the instantaneous voltage and current value sequences of each line, and locating the oscillation disturbance source based on the oscillation type, sub-supersynchronous power, and energy flow power, accurate location of the oscillation disturbance source is achieved from the oscillation mechanism level, and it can adapt to different types of oscillations.

[0081] Optionally, the processing result includes the current at the subsynchronous frequency and the current at the supersynchronous frequency complementary to the subsynchronous frequency; the second determining module 502 is specifically used for: Based on the current at each of the subsynchronous frequencies and the current at each of the supersynchronous frequencies, determine whether the current at the subsynchronous frequency and the current at the supersynchronous frequency of each line meet the preset conditions. If the current at the subsynchronous frequency and the current at the supersynchronous frequency meet the preset conditions, the line is determined as the target line. If the number of target lines is less than a preset threshold, the oscillation type is determined to be an oscillation dominated by the induction generator of the doubly fed wind turbine; If the number of target lines is greater than or equal to the preset threshold, the oscillation type is determined to be an oscillation dominated by the converter phase-locked loop.

[0082] Optionally, the second determining module 502 is further configured to: In the case where the oscillation type is dominated by the induction generator of the doubly fed wind turbine, the source of the oscillation disturbance is located based on the sub-supersynchronous power of each of the above. In the case where the oscillation type is dominated by the converter phase-locked loop, the oscillation disturbance source is located based on the power of each energy flow.

[0083] Optionally, the second determining module 502 is further configured to: The maximum sub-supersynchronous power is determined from all the sub-supersynchronous powers; The doubly fed wind turbine of the line corresponding to the maximum subsynchronous power is identified as the source of oscillation disturbance.

[0084] Optionally, the second determining module 502 is further configured to: Determine the maximum energy flow power from each of the energy flow powers; The converter phase-locked loop of the line corresponding to the maximum power flow is identified as the source of oscillation disturbance.

[0085] Optionally, the processing result may also include the voltage, voltage angle, and current angle of the subsynchronous frequency, as well as the voltage, voltage angle, and current angle of the supersynchronous frequency that is complementary to the subsynchronous frequency.

[0086] Figure 6 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 6 As shown, the electronic device 600 may include a processor 610, a communication interface 620, a memory 630, and a communication bus 640, wherein the processor 610, the communication interface 620, and the memory 630 communicate with each other through the communication bus 640. The processor 610 can call logical instructions in the memory 630 to execute a sub-supersynchronous oscillation disturbance source localization method, which includes: processing the acquired instantaneous voltage and current value sequences of at least one line to obtain processing results; for each line, determining the sub-supersynchronous power and energy flow power based on the processing results of the line; sending each processing result, each sub-supersynchronous power, and each energy flow power to the master station in the power system; the master station is used to determine the oscillation type based on each processing result, and to locate the oscillation disturbance source based on the oscillation type, each sub-supersynchronous power, and each energy flow power.

[0087] Optionally, the processor 610 may invoke logic instructions in the memory 630 to execute the above-described sub-supersynchronous oscillation disturbance source localization method. This method includes: receiving processing results, sub-supersynchronous power, and energy flow power from at least one line transmitted by a substation in the power system; wherein the processing results are obtained by processing the acquired instantaneous voltage and current value sequences of each of the lines; the sub-supersynchronous power and the energy flow power are both obtained based on the processing results; determining the oscillation type based on each of the processing results; and locating the oscillation disturbance source based on the oscillation type, each of the sub-supersynchronous power, and each of the energy flow power.

[0088] Furthermore, the logical instructions in the aforementioned memory 630 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, in essence, 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 methods described in the various embodiments 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.

[0089] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the sub-supersynchronous oscillation disturbance source localization method provided by the above methods. The method includes: processing the voltage and current instantaneous value sequences of at least one line respectively to obtain processing results; for each line, determining the sub-supersynchronous power and energy flow power based on the processing results of the line; sending each processing result, each sub-supersynchronous power and each energy flow power to the master station in the power system; the master station is used to determine the oscillation type based on each processing result, and to locate the oscillation disturbance source based on the oscillation type, each sub-supersynchronous power and each energy flow power.

[0090] Optionally, when the computer program is executed by a processor, it implements a method for locating sub-supersynchronous oscillation disturbance sources provided by the methods described above. This method includes: receiving processing results, sub-supersynchronous power, and energy flow power from at least one line transmitted by a substation in the power system; wherein the processing results are obtained by processing the acquired instantaneous voltage and current value sequences of each of the lines; the sub-supersynchronous power and the energy flow power are both obtained based on the processing results; determining the oscillation type based on each of the processing results; and locating the oscillation disturbance source based on the oscillation type, each of the sub-supersynchronous power, and each of the energy flow power.

[0091] In another aspect, the present invention also provides a non-transient computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a method for locating sub-supersynchronous oscillation disturbance sources provided by the methods described above. This method includes: processing a sequence of instantaneous voltage and current values ​​of at least one line to obtain processing results; for each line, determining the sub-supersynchronous power and energy flow power based on the processing results of the line; and sending each processing result, each sub-supersynchronous power, and each energy flow power to a master station in the power system; the master station is used to determine the oscillation type based on each processing result, and to locate the oscillation disturbance source based on the oscillation type, each sub-supersynchronous power, and each energy flow power.

[0092] Optionally, when the computer program is executed by a processor, it implements a method for locating sub-supersynchronous oscillation disturbance sources provided by the methods described above. This method includes: receiving processing results, sub-supersynchronous power, and energy flow power from at least one line transmitted by a substation in the power system; wherein the processing results are obtained by processing the acquired instantaneous voltage and current value sequences of each of the lines; the sub-supersynchronous power and the energy flow power are both obtained based on the processing results; determining the oscillation type based on each of the processing results; and locating the oscillation disturbance source based on the oscillation type, each of the sub-supersynchronous power, and each of the energy flow power.

[0093] 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.

[0094] 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.

[0095] 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 a sub-supersynchronous oscillation disturbance source, characterized in that, Substations used in power systems include: The instantaneous voltage and current value sequences of at least one line are processed to obtain the processing results; For each of the lines, the sub-supersynchronous power and energy flow power are determined based on the processing results of the lines. The processing results, the sub-supersynchronous power, and the energy flow power are sent to the master station in the power system. The master station is used to determine the oscillation type based on the processing results and to locate the oscillation disturbance source based on the oscillation type, the sub-supersynchronous power, and the energy flow power.

2. The method for locating the source of sub-supersynchronous oscillation disturbance according to claim 1, characterized in that, The processing results include the voltage, current, voltage angle, and current angle at the subsynchronous frequency, as well as the voltage, current, voltage angle, and current angle at the supersynchronous frequency that is complementary to the subsynchronous frequency. The determination of sub-supersynchronous power and energy flow power based on the processing results includes: The active power of the subsynchronous component is calculated based on the voltage, the current, the angle of the voltage, and the angle of the current at the subsynchronous frequency. The active power of the supersynchronous component is calculated based on the voltage, the current, the angle of the voltage, and the angle of the current at the supersynchronous frequency. Based on the active power of the subsynchronous component and the active power of the supersynchronous component, the subsynchronous supersynchronous power and the energy flow power are calculated respectively.

3. A method for locating a sub-supersynchronous oscillation disturbance source, characterized in that, Master stations used in power systems include: The system receives processing results, sub-supersynchronous power, and energy flow power of at least one line from a substation in the power system; wherein the processing results are obtained by processing the acquired instantaneous voltage and current value sequences of each line; and the sub-supersynchronous power and the energy flow power are both obtained based on the processing results. Based on the processing results, the oscillation type is determined; Based on the oscillation type, the sub-supersynchronous power, and the energy flow power, the oscillation disturbance source is located.

4. The method for locating the sub-supersynchronous oscillation disturbance source according to claim 3, characterized in that, The processing results include the current at the subsynchronous frequency and the current at the supersynchronous frequency that is complementary to the subsynchronous frequency. The determination of the oscillation type based on the processing results includes: Based on the current at each of the subsynchronous frequencies and the current at each of the supersynchronous frequencies, determine whether the current at the subsynchronous frequency and the current at the supersynchronous frequency of each line meet the preset conditions. If the current at the subsynchronous frequency and the current at the supersynchronous frequency meet the preset conditions, the line is determined as the target line. If the number of target lines is less than a preset threshold, the oscillation type is determined to be an oscillation dominated by the induction generator of the doubly fed wind turbine; If the number of target lines is greater than or equal to the preset threshold, the oscillation type is determined to be an oscillation dominated by the converter phase-locked loop.

5. The method for locating the source of sub-supersynchronous oscillation disturbance according to claim 4, characterized in that, The method of locating the oscillation disturbance source based on the oscillation type, the sub-supersynchronous power, and the energy flow power includes: In the case where the oscillation type is dominated by the induction generator of the doubly fed wind turbine, the source of the oscillation disturbance is located based on the sub-supersynchronous power of each of the above. In the case where the oscillation type is dominated by the converter phase-locked loop, the oscillation disturbance source is located based on the power of each energy flow.

6. The method for locating the sub-supersynchronous oscillation disturbance source according to claim 5, characterized in that, The method of locating the oscillation disturbance source based on the sub-supersynchronous power includes: The maximum sub-supersynchronous power is determined from all the sub-supersynchronous powers; The doubly fed wind turbine of the line corresponding to the maximum subsynchronous power is identified as the source of oscillation disturbance.

7. The method for locating the source of sub-supersynchronous oscillation disturbance according to claim 5, characterized in that, The step of locating the oscillation disturbance source based on the power of each of the energy flows includes: Determine the maximum energy flow power from each of the energy flow powers; The converter phase-locked loop of the line corresponding to the maximum power flow is identified as the source of oscillation disturbance.

8. The method for locating the source of sub-supersynchronous oscillation disturbance according to claim 4, characterized in that, The processing results also include the voltage, voltage angle, and current angle of the subsynchronous frequency, as well as the voltage, voltage angle, and current angle of the supersynchronous frequency that is complementary to the subsynchronous frequency.

9. A sub-supersynchronous oscillation disturbance source positioning device, characterized in that, Substations used in power systems include: The processing module is used to process the acquired instantaneous voltage and current value sequences of at least one line to obtain the processing results. The first determining module is used to determine the sub-supersynchronous power and energy flow power for each of the lines based on the processing results of the lines. The transmitting module is used to transmit the processing results, the sub-supersynchronous power, and the energy flow power to the master station in the power system; the master station is used to determine the oscillation type based on the processing results, and to locate the oscillation disturbance source based on the oscillation type, the sub-supersynchronous power, and the energy flow power.

10. A sub-supersynchronous oscillation disturbance source positioning device, characterized in that, Master stations used in power systems include: A receiving module is configured to receive processing results, sub-supersynchronous power, and energy flow power of at least one line transmitted by a substation in a power system; wherein the processing results are obtained by processing the acquired instantaneous voltage and current value sequences of each of the lines respectively; the sub-supersynchronous power and the energy flow power are both obtained based on the processing results; The second determining module is used to determine the oscillation type based on the processing results. The positioning module is used to locate the oscillation disturbance source based on the oscillation type, the sub-supersynchronous power, and the energy flow power.

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