CN-122026267-A - Time sequence data processing method applied to overvoltage protection of converter

CN122026267ACN 122026267 ACN122026267 ACN 122026267ACN-122026267-A

Abstract

The invention discloses a time sequence data processing method applied to overvoltage protection of a current converter, which relates to the technical field of current converters and comprises the steps of obtaining double-side operation data of the current converter in different operation modes, generating current converter time sequence data according to the obtained double-side operation data, processing the obtained current converter time sequence data, completing time sequence data integration, and judging whether the current converter has an overvoltage risk according to a time sequence data integration result.

Inventors

E TIANLONG
LIU XUELIANG
Feng yangzhou
HUANG LINKE
ZHANG ZITANG
LIU WENLIN
JIN ZHIPENG
YANG JIAN
MA MINGZHE

Assignees

合肥工业大学

Dates

Publication Date: 20260512
Application Date: 20260130

Claims (9)

1. The time sequence data processing method applied to the overvoltage protection of the converter is characterized by comprising the following steps of: acquiring bilateral operation data of the converter in different operation modes, and generating converter time sequence data according to the acquired bilateral operation data; and processing the obtained current converter time sequence data to complete time sequence data integration, and judging whether the current converter has overvoltage risk according to the time sequence data integration result.
2. The time series data processing method applied to overvoltage protection of a converter according to claim 1, wherein the operation mode of the converter includes a rectifying mode and an inverting mode; The double-side operation data in the rectification mode comprises alternating-current side active power and direct-current side output voltage; the double-side operation data in the inversion mode comprises direct-current side active power and alternating-current side output voltage.
3. The time series data processing method applied to the overvoltage protection of the converter according to claim 2, wherein the process of generating the time series data of the converter according to the obtained double-sided operation data comprises the steps of: Respectively constructing time shafts corresponding to a rectification mode and an inversion mode; Generating a first active power change curve and a first voltage change curve according to the double-sided operation data in the rectification mode, and generating a second active power change curve and a second voltage change curve according to the double-sided operation data in the inversion mode; Mapping the change curve generated in the rectification mode into a corresponding time axis to obtain a converter operation diagram in the rectification mode; mapping the change curve generated in the inversion mode into a corresponding time axis to obtain an inverter operation diagram in the inversion mode; setting a response time threshold in the generated converter operation diagram, creating a time window with corresponding duration in the converter operation diagram according to the set response time threshold, and marking a time period corresponding to the time window as [ t1, t2], wherein t2 corresponds to the current time, and t1 is less than t2; and summarizing the operation data corresponding to each change curve in the time window to obtain the corresponding converter time sequence data.
4. A time series data processing method applied to overvoltage protection of a converter according to claim 3, wherein when the converter is in a rectifying mode, a required voltage value and an expected power angle value of a direct current side of the converter are set according to a first active power change curve; marking a delay point at a corresponding position on a first active power change curve according to an expected power angle value at the current moment, marking the moment corresponding to the delay point as t3, marking a response point at a corresponding position on the first voltage change curve at the same time interval as t2 according to the time interval from t1 to t3, and marking the moment corresponding to the response point as t4, wherein t2> t3> t4> t1; And obtaining fluctuation coefficients between an alternating current side and a direct current side of the converter in a rectification mode, respectively marking the fluctuation coefficients as Zx1 and Zx2, and integrating the time sequence data of the converter in a time window according to the obtained fluctuation coefficients to obtain a power integration value and a voltage integration value respectively.
5. The time series data processing method applied to overvoltage protection of a converter according to claim 4, wherein a fluctuation threshold K and a response threshold range (a 1, a 2) are set, wherein a1<1, a2>1; When Zx1< K, taking the average power value in the time period from t1 to t3 as a power integration value; when Zx2< K, taking the average voltage value in the time period from t4 to t2 as a voltage integration value; When Zx1 is more than or equal to K, comparing Zx1/Zx2 with a response threshold range; If Zx1/Zx 2E (a 1, a 2), taking the power average value in the time period from t1 to t3 as a power integration value, and taking the voltage average value in the time period from t4 to t2 as a voltage integration value; If Zx1/Zx2 (A 1, a 2), the power value at time t3 is used as the power integrated value, and the voltage value at time t2 is used as the voltage integrated value.
6. A time series data processing method applied to overvoltage protection of a converter according to claim 3, wherein when the converter is in an inversion mode, a required power value and an expected power angle value of an alternating current side of the converter are set according to a second active power change curve; Marking a response point at a corresponding position on a second voltage change curve according to an expected power angle value at the current moment, marking the moment corresponding to the delay point as t5, marking a response point at a corresponding position on the second active power change curve at the same time interval as the moment t1 according to the time interval from t5 to t2, and marking the moment corresponding to the response point as t6, wherein t2> t5> t6> t1; And obtaining fluctuation coefficients between an alternating current side and a direct current side of the converter in an inversion mode, respectively marking the fluctuation coefficients as Nx1 and Nx2, and integrating the time sequence data of the converter in a time window according to the obtained fluctuation coefficients to obtain a power integration value and a voltage integration value respectively.
7. The time series data processing method applied to overvoltage protection of a converter according to claim 6, wherein when Nx1< K, a power average value in a period from t6 to t2 is taken as a power integration value; when Nx2< K, taking the voltage average value in the time period from t1 to t5 as a voltage integration value; when Nx1 is more than or equal to K, comparing Nx2/Nx1 with a response threshold range; If Nx2/Nx1 epsilon (a 1, a 2), taking the power average value in the time period from t6 to t2 as a power integration value, and taking the voltage average value in the time period from t1 to t5 as a voltage integration value; if Nx2/Nx1 (A 1, a 2), the power value at time t2 is taken as the power integration value, and time t5 is taken as the power integration value.
8. The time series data processing method applied to the overvoltage protection of the current converter according to claim 4, wherein in the rectification mode, the obtained voltage integration value is compared with a required voltage value to obtain a corresponding comparison result; if the comparison result is that the voltage integration value is higher than the required voltage value, overvoltage risk early warning information is directly generated; If the comparison result is that the voltage integration value is not higher than the required voltage value, a curve slope of the first voltage change curve at the current moment is obtained, the predicted time length of the voltage value at the current moment reaching the required voltage value is obtained according to the curve slope, if the predicted time length is lower than a set time length threshold value, overvoltage risk early warning information is generated, and otherwise, no operation is performed.
9. The time series data processing method applied to the overvoltage protection of the current converter according to claim 6, wherein in the inversion mode, the power integrated value is compared with the required power value to obtain a corresponding comparison result; If the comparison result is that the power integration value is higher than the required power value, directly generating alternating-current side overvoltage early warning information; If the comparison result is that the power integrated value is not higher than the required power value, acquiring a voltage value at the current moment on the second voltage change curve; Setting an early warning voltage value on the direct current side of the converter, and generating direct current side overvoltage early warning information when the voltage value at the current moment on the second voltage change curve exceeds the early warning voltage value; And when the voltage value of the current moment on the second voltage change curve does not exceed the early warning voltage value, obtaining the curve slope of the second voltage change curve at the current moment, obtaining the predicted duration of the voltage value at the current moment reaching the early warning voltage value according to the curve slope, and if the predicted duration is lower than the set duration threshold, generating direct-current side overvoltage early warning information, otherwise, not performing any operation.

Description

Time sequence data processing method applied to overvoltage protection of converter Technical Field The invention relates to the technical field of converters, in particular to a time sequence data processing method applied to overvoltage protection of a converter. Background The converter is used as core equipment for electric energy conversion, and the safe and stable operation of the converter is important. In the prior art, instantaneous judgment based on a voltage threshold is generally adopted, namely, when the voltage of a detection point exceeds a set threshold, the protection action is immediately triggered, the mode lacks the prediction capability of potential risks, and the real overvoltage risk cannot be accurately distinguished from the transient interference, so that a time sequence data processing method for overvoltage protection of the converter is provided. Disclosure of Invention The invention aims to provide a time sequence data processing method for overvoltage protection of a converter. The invention can realize the aim by the following technical scheme that the time sequence data processing method applied to the overvoltage protection of the converter comprises the following steps: acquiring bilateral operation data of the converter in different operation modes, and generating converter time sequence data according to the acquired bilateral operation data; and processing the obtained current converter time sequence data to complete time sequence data integration, and judging whether the current converter has overvoltage risk according to the time sequence data integration result. Further, the operation modes of the converter comprise a rectification mode and an inversion mode; The double-side operation data in the rectification mode comprises alternating-current side active power and direct-current side output voltage; the double-side operation data in the inversion mode comprises direct-current side active power and alternating-current side output voltage. Further, the process of generating the converter time sequence data according to the obtained double-side operation data comprises the following steps: Respectively constructing time shafts corresponding to a rectification mode and an inversion mode; Generating a first active power change curve and a first voltage change curve according to the double-sided operation data in the rectification mode, and generating a second active power change curve and a second voltage change curve according to the double-sided operation data in the inversion mode; Mapping the change curve generated in the rectification mode into a corresponding time axis to obtain a converter operation diagram in the rectification mode; mapping the change curve generated in the inversion mode into a corresponding time axis to obtain an inverter operation diagram in the inversion mode; setting a response time threshold in the generated converter operation diagram, creating a time window with corresponding duration in the converter operation diagram according to the set response time threshold, and marking a time period corresponding to the time window as [ t1, t2], wherein t2 corresponds to the current time, and t1 is less than t2; and summarizing the operation data corresponding to each change curve in the time window to obtain the corresponding converter time sequence data. Further, when the converter is in a rectification mode, setting a required voltage value and an expected power angle value of a direct-current side of the converter according to a first active power change curve; marking a delay point at a corresponding position on a first active power change curve according to an expected power angle value at the current moment, marking the moment corresponding to the delay point as t3, marking a response point at a corresponding position on the first voltage change curve at the same time interval as t2 according to the time interval from t1 to t3, and marking the moment corresponding to the response point as t4, wherein t2> t3> t4> t1; And obtaining fluctuation coefficients between an alternating current side and a direct current side of the converter in a rectification mode, respectively marking the fluctuation coefficients as Zx1 and Zx2, and integrating the time sequence data of the converter in a time window according to the obtained fluctuation coefficients to obtain a power integration value and a voltage integration value respectively. 5. The time series data processing method applied to overvoltage protection of a converter according to claim 4, wherein a fluctuation threshold K and a response threshold range (a 1, a 2) are set, wherein a1<1, a2>1; When Zx1< K, taking the average power value in the time period from t1 to t3 as a power integration value; when Zx2< K, taking the average voltage value in the time period from t4 to t2 as a voltage integration value; When Zx1 is more than or equal to K, comparing Zx1/Zx2 with a response threshold range; If