CN-122017391-A - Power system oscillation alarm false alarm prevention method and system based on multi-source data check

CN122017391ACN 122017391 ACN122017391 ACN 122017391ACN-122017391-A

Abstract

The method and the system for preventing false alarm of the electric power system oscillation alarm based on multi-source data check comprise the steps that a master station monitors the oscillation alarm in real time, when the master station monitors the oscillation alarm, the master station triggers the oscillation check based on broadband data real-time check paths to judge whether the oscillation alarm is caused by spectrum aliasing, when the real-time check paths based on the broadband data judge that the oscillation alarm is caused by spectrum aliasing, the master station issues the oscillation false alarm, otherwise, the master station triggers the oscillation check based on Gao Caiyang record wave call check paths, the oscillation check based on Gao Caiyang record wave call check paths checks whether the oscillation alarm is caused by spectrum aliasing, and when the oscillation check based on Gao Caiyang record wave call check paths judges that the oscillation alarm is caused by spectrum aliasing, the master station issues the oscillation false alarm. The invention solves the problem of oscillation false alarm caused by frequency spectrum aliasing.

Inventors

ZOU JILIN
CHAI QIAN
LIN SHIYI
XIE XIAODONG
YAN GENG
ZHANG JUN
YANG ZHEN
WU WEI
XIONG XIAO

Assignees

北京四方继保工程技术有限公司
北京四方继保自动化股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251231

Claims (11)

1. The utility model provides a power system oscillation warning false alarm prevention method based on multisource data check, which is characterized by comprising the following steps: the master station monitors oscillation alarms in real time; When the real-time checking path based on the broadband data judges that the oscillation alarm is caused by the frequency spectrum aliasing, the master station issues an oscillation false alarm, otherwise, the master station triggers the oscillation check based on Gao Caiyang wave recording calling checking path; And when the oscillation check of the checking path based on Gao Caiyang wave recording and calling judges that the oscillation alarm is caused by frequency spectrum aliasing, the master station issues an oscillation false alarm.
2. The method for preventing false alarm of power system oscillation alarm based on multi-source data checking according to claim 1, wherein, The master station monitors oscillation alarm in real time based on the low sampling rate of the phasor measurement unit data stream, and records the oscillation alarm frequency and the oscillation alarm amplitude, wherein the low sampling rate of the phasor measurement unit is 50Hz or 100Hz.
3. The method for preventing false alarm of power system oscillation alarm based on multi-source data checking according to claim 1, wherein, When triggering the oscillation check based on the broadband data real-time check path, the master station identifies the high-frequency inter-harmonic oscillation component with the frequency higher than the sampling Nyquist frequency of the phasor measurement unit from the frequency spectrum data of the broadband measurement device, determines the folding frequency and the amplitude of the high-frequency inter-harmonic component, and checks whether the oscillation alarm is caused by frequency spectrum aliasing according to the folding frequency and the amplitude of the high-frequency inter-harmonic component.
4. The method for preventing false alarm of power system oscillation alarm based on multi-source data checking according to claim 3, wherein, If | - |≤ And the amplitude of the harmonic component between high frequencies is larger than the oscillation amplitude of the oscillation alarm Judging that the oscillation alarm is caused by frequency spectrum aliasing, issuing an oscillation false alarm by the main station, wherein, Is the folding frequency of the high-frequency inter-harmonic components, In order to alert the frequency of oscillation, Is a very small positive number; If | - |≤ Indicating that the frequency is close but the amplitude of the harmonic component between the high frequencies is smaller than the oscillation amplitude of the oscillation alarm A kind of electronic device And if the check is multiplied, judging that the check is not passed, triggering oscillation check based on Gao Caiyang wave recording and calling check paths, wherein, The value range is (0, 1) for the preset proportionality coefficient; If | - |> And judging that the check does not pass, and triggering oscillation check based on Gao Caiyang wave recording and calling check paths.
5. The method for preventing false alarm of power system oscillation alarm based on multi-source data checking according to claim 4, wherein, When triggering oscillation check based on Gao Caiyang wave recording calling check paths, calling a high sampling rate dynamic wave recording file to a phasor measurement unit of a substation, wherein the high sampling rate of the dynamic wave recording file is larger than 1200Hz, carrying out FFT analysis on dynamic wave recording file data to identify dominant oscillation frequency and amplitude, and checking whether the oscillation alarm is caused by frequency spectrum aliasing according to the dominant oscillation frequency and amplitude, and the oscillation alarm frequency and the oscillation alarm amplitude.
6. The method for preventing false alarm of power system oscillation alarm based on multi-source data checking according to claim 5, wherein, If | - |≤ And dominates the oscillation amplitude Is larger than the oscillation alarming oscillation amplitude The oscillation is judged to be caused by frequency spectrum aliasing, the master station issues an oscillation false alarm, wherein, In order to dominate the oscillation frequency, In order to alert the frequency of oscillation, Is a very small positive number; If | - |≤ Indicating that the frequencies are close, but Less than A kind of electronic device And (3) determining the measurement data triggering the oscillation alarm as measurement noise, The value range is (0, 1) for the preset proportionality coefficient; If | - |> Then it is determined that the data measurement is abnormal.
7. An oscillation alarm false alarm prevention system of a power system based on multi-source data check, for implementing the oscillation alarm false alarm prevention method of a power system based on multi-source data check as set forth in any one of claims 1 to 6, wherein an oscillation alarm check module is configured at a master station, the oscillation alarm check module includes: the alarm monitoring unit is used for monitoring oscillation alarm in real time, triggering oscillation check based on broadband data real-time check paths when the oscillation alarm is monitored, and triggering oscillation check based on Gao Caiyang recording wave calling check paths when the real-time check paths based on the broadband data do not judge that the oscillation alarm is caused by frequency spectrum aliasing; The system comprises a broadband data alarm checking unit, an alarm monitoring unit, a master station, a frequency spectrum aliasing detection unit and a frequency spectrum aliasing detection unit, wherein the broadband data alarm checking unit is used for checking the oscillation of a path in real time based on broadband data to judge whether the oscillation alarm is caused by the frequency spectrum aliasing; And when the oscillation check of the check path based on Gao Caiyang wave recording and calling judges that the oscillation alarm is caused by frequency spectrum aliasing, the master station issues an oscillation false alarm.
8. The system for preventing false alarm of power system oscillation alarm based on multi-source data checking as claimed in claim 7, wherein, The broadband data alarm checking unit is used for identifying high-frequency inter-harmonic oscillation components with the frequency higher than the sampling Nyquist frequency of the phasor measurement unit from frequency spectrum data of a broadband measurement device and determining folding frequencies and amplitudes of the high-frequency inter-harmonic components when triggering oscillation checking based on broadband data real-time checking paths, and checking whether oscillation alarms are caused by frequency spectrum aliasing according to the folding frequencies and the amplitudes of the high-frequency inter-harmonic components, and comprises the following steps: If | - |≤ And the amplitude of the harmonic component between high frequencies is larger than the oscillation amplitude of the oscillation alarm Judging that the oscillation alarm is caused by frequency spectrum aliasing, issuing an oscillation false alarm by the main station, wherein, Is the folding frequency of the high-frequency inter-harmonic components, In order to alert the frequency of oscillation, Is a very small positive number; If | - |≤ Indicating that the frequency is close but the amplitude of the harmonic component between the high frequencies is smaller than the oscillation amplitude of the oscillation alarm A kind of electronic device And if the check is multiplied, judging that the check is not passed, triggering oscillation check based on Gao Caiyang wave recording and calling check paths, wherein, The value range is (0, 1) for the preset proportionality coefficient; If | - |> And judging that the check does not pass, and triggering oscillation check based on Gao Caiyang wave recording and calling check paths.
9. The system for preventing false alarm of power system oscillation alarm based on multi-source data checking as claimed in claim 7, wherein, The sampling wave recording alarm checking unit calls a dynamic wave recording file with high sampling rate to a phasor measuring unit of a substation when triggering oscillation check based on Gao Caiyang wave recording call check paths, wherein the high sampling rate of the dynamic wave recording file is larger than 1200Hz, carries out FFT analysis on dynamic wave recording file data to identify dominant oscillation frequency and amplitude, and checks whether the oscillation alarm is caused by frequency spectrum aliasing according to the dominant oscillation frequency and amplitude, the oscillation alarm frequency and the oscillation alarm amplitude, and comprises the following steps: If | - |≤ And dominates the oscillation amplitude Is larger than the oscillation alarming oscillation amplitude The oscillation is judged to be caused by frequency spectrum aliasing, the master station issues an oscillation false alarm, wherein, In order to dominate the oscillation frequency, In order to alert the frequency of oscillation, Is a very small positive number; If | - |≤ Indicating that the frequencies are close, but Less than A kind of electronic device And (3) determining the measurement data triggering the oscillation alarm as measurement noise, The value range is (0, 1) for the preset proportionality coefficient; If | - |> Then it is determined that the data measurement is abnormal.
10. A terminal comprises a processor and a storage medium, and is characterized in that: The storage medium is used for storing instructions; The processor being operative according to the instructions to perform the steps of the method of any one of claims 1-6.
11. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any of claims 1-6.

Description

Power system oscillation alarm false alarm prevention method and system based on multi-source data check Technical Field The invention belongs to the technical field of power grid safety and stability, and particularly relates to an electric power system oscillation alarm false alarm prevention method and system based on multi-source data checking. Background The low-frequency oscillation of the power system is an important problem for threatening the safe and stable operation of the power grid. Currently, a Wide Area Measurement System (WAMS) is commonly adopted by each level of dispatching center to perform real-time oscillation monitoring on a power grid. The master station WAMS receives Phasor Measurement Unit (PMU) data for balancing communication and storage pressure, typically using a sampling frequency of 25Hz or 50 Hz. According to the nyquist sampling theorem, the sampling rate can only accurately observe oscillation modes with frequencies below 12.5Hz or 25 Hz. However, with the widespread use of power electronics, high-frequency oscillation phenomena such as subsynchronous oscillation (5 Hz to 45 Hz) and supersynchronous oscillation are increasingly frequent. When the frequencies of the high-frequency oscillation signals exceed the nyquist frequency sampled by the main station, the frequency spectrum aliasing effect is erroneously folded to a low frequency band, so that the main station misjudges the signals as low-frequency oscillation events, and false alarms are generated. With the large-scale access of new energy, the broadband oscillation problem of the power system is increasingly outstanding. The prior WAMS system can not accurately capture high-frequency oscillation signals due to low PMU sampling rate (25 Hz or 50 Hz) of a main station, so that subsynchronous/supersynchronous oscillation is misjudged to be low-frequency oscillation, false alarms are easily generated due to spectrum aliasing phenomena (particularly high-frequency inter-harmonic components), the delay of high-sampling wave recording analysis is only large, the real-time requirement can not be met, the aliasing can not be effectively identified due to lack of fine analysis on broadband signals, the prior system lacks automatic and multi-source data checking means after alarm triggering, the authenticity of the alarm can not be verified, and false alarm information needs manual intervention of a dispatcher, response delay and misoperation risk exist. In the prior art, a wide-frequency oscillation wide-area real-time monitoring system of a power grid performs frequency spectrum analysis according to electric signals acquired by signal sensing modules of a wide-frequency measuring device and generates oscillation alarm information based on frequency spectrum analysis results, a wide-frequency measurement data online checking method performs online checking on data of the oscillation wide-frequency device, and a wide-frequency oscillation wide-area monitoring system and a wide-frequency oscillation source positioning method perform oscillation source positioning based on the frequency spectrum analysis results and the alarm information of the wide-frequency device. The prior art lacks a mechanism for effectively identifying and filtering the principle false alarms caused by the insufficient sampling rate at the main station side. Disclosure of Invention In order to solve the defects in the prior art, the invention provides an oscillation alarm false alarm prevention method and an oscillation alarm verification system for an electric power system based on multi-source data check, which realize an oscillation alarm verification mechanism based on dual-path serial check and intelligent decision, realize full-flow and intelligent verification from quick preliminary screening to accurate final confirmation of an oscillation alarm through cooperation of a broadband data real-time analysis path and a Gao Caiyang wave recording accurate analysis path so as to solve the problem of oscillation false alarm caused by frequency spectrum aliasing, and realize automatic, quick and double check on alarm authenticity by adding an oscillation check module at a main station side and combining broadband measurement data and high-sampling wave recording data. The invention adopts the following technical scheme. The invention provides a multi-source data checking-based power system oscillation alarm false alarm prevention method, which comprises the following steps: the master station monitors oscillation alarms in real time; When the real-time checking path based on the broadband data judges that the oscillation alarm is caused by the frequency spectrum aliasing, the master station issues an oscillation false alarm, otherwise, the master station triggers the oscillation check based on Gao Caiyang wave recording calling checking path; And when the oscillation check of the checking path based on Gao Caiyang wave recording and calling judges that the