CN115714360A - Method and device for processing differential flow exception of high-voltage transmission line - Google Patents
Method and device for processing differential flow exception of high-voltage transmission line Download PDFInfo
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Abstract
The invention belongs to the technical field of power systems, and discloses a method and a device for processing differential flow abnormity of a high-voltage power transmission line, wherein the method comprises the following steps: respectively acquiring analog quantity data of line protection devices arranged on two sides of a line, wherein the analog quantity data at least comprises three-phase voltage, three-phase current, zero-sequence current and three-phase differential current of the line protection devices; under the condition that the load current exists in the line protection device, if the maximum value of the three-phase currents meets a preset condition, calculating a differential current early warning threshold value of current differential protection; and starting differential flow abnormity early warning under the condition that the three-phase differential current is greater than the differential flow early warning threshold value, and processing the analog quantity data and the wave recording waveform data. The problems that in a current differential protection system in the prior art, the diagnosis accuracy rate of differential flow abnormity is low, and fault early warning is not timely are solved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a method and a device for processing differential flow exception of a high-voltage power transmission line.
Background
The current differential protection is a main protection mode of a high-voltage transmission line of the line, and the reliable and normal operation of the current differential protection has great significance for quickly removing faults, ensuring the safety of the transmission line and the safety of a power grid. The differential flow anomaly is a significant cause of incorrect operation of the current differential. Line current differential protection requires current data information on both sides, so its reliable operation is affected by the state of the devices on both sides. The reasons for the abnormal differential current are more, the analysis is more complex, the traditional method mainly utilizes the sampling data of the single-side protection device for analysis, the diagnosis accuracy and precision are lower, and the requirement of site accurate treatment is difficult to meet.
Disclosure of Invention
The embodiment of the invention provides a method and a device for processing differential flow abnormity of a high-voltage transmission line, and aims to solve the problems that in a current differential protection system in the prior art, the diagnosis accuracy of differential flow abnormity is low, and fault early warning is not timely. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of the embodiment of the invention, a method for processing differential flow exception of a high-voltage transmission line is provided.
In some embodiments, the method comprises:
respectively acquiring analog quantity data of line protection devices arranged on two sides of a line, wherein the analog quantity data at least comprise three-phase voltage, three-phase current, zero-sequence current and three-phase differential current of the line protection devices; the line protection devices arranged on the two sides of the line comprise a line protection device on the side and a line protection device on the opposite side;
under the condition that the load current exists in the line protection device, if the maximum value of the three-phase current is judged to meet a preset condition, calculating a differential current early warning threshold value of current differential protection;
and starting differential flow abnormity early warning under the condition that the three-phase differential current is greater than the differential flow early warning threshold value, and processing the analog quantity data and the wave recording waveform data.
In some embodiments, obtaining analog data of the line protection device specifically includes:
and acquiring the analog quantity data by utilizing an online monitoring device of secondary equipment in the transformer substation through a preset calling strategy.
In some embodiments, the preset summons policy is any one of:
periodically calling data based on a preset calling period;
and calling the analog quantity data when responding to the fault recording pushed by the line protection device.
In some embodiments, when it is determined that the maximum value of the three-phase currents satisfies a preset condition, the preset condition is: max (Ia, ib, ic) >0.05In;
wherein In is rated secondary current of the line protection device, and Ia, ib and Ic are respectively a phase-a current amplitude, a phase-b current amplitude and a phase-c current amplitude acquired by the line protection device at the side.
In some embodiments, a first preset formula is used for calculating a differential current early warning threshold value Icdyj of the current differential protection;
wherein the first preset formula is as follows:
Icdyj＝K*max(Ia,Ib,Ic)
in the formula, K is a threshold coefficient, and Ia, ib, and Ic are a phase-a current amplitude, a phase-b current amplitude, and a phase-c current amplitude, which are acquired by the local line protection device, respectively.
In some embodiments, when the three-phase differential current is greater than the differential current early warning threshold, the differential current abnormal early warning is started, and the analog quantity data and the recording waveform data are processed, which specifically includes:
calculating to obtain the three-phase current amplitude difference Idda according to a second preset formula ht 、Icdb ht 、Icdc ht Sum phase difference Anga ht 、Angb ht 、Angc ht ；
Wherein the second preset formula comprises:
Icda ht ＝Ia-Iar
Anga ht ＝AngIa-AngIar-180°
Icdb ht ＝Ib-Ibr
Angb ht ＝AngIb-AngIbr-180°
Icdc ht ＝Ic-Icr
Angc ht ＝AngIc-AngIcr-180°
in the formula, ia, ib and Ic are respectively the amplitude of the phase a current, the amplitude of the phase b current and the amplitude of the phase c current acquired by the line protection device at the side; iar, ibr and Icr represent a phase-a current amplitude, a phase-b current amplitude and a phase-c current amplitude acquired by an opposite-side line protection device, angIa, angIb and Angic represent a phase-a current phase angle, a phase-b current phase angle and a phase-c current phase angle acquired by the local-side line protection device, and AngIar, angIbr and AngIcr represent a phase-a current phase angle, a phase-b current phase angle and a phase-c current phase angle acquired by the opposite-side line protection device.
In some embodiments, when the three-phase differential current is greater than the differential current early warning threshold, the differential current abnormal early warning is started, and the analog quantity data and the recording waveform data are processed, which specifically includes:
extracting the current sequences of the current sequence of the side and the opposite side in the fault waveform or the waveform started most recently, taking the wave recording starting time as a reference, starting 1 cycle before the starting time and 3 cycles after the starting, and calculating the similarity coefficient rho of the current sequences of the side and the opposite side by using a third preset formula, wherein the current sequences of the side and the opposite side are Xi (i = a, b and c) and the current sequences of the opposite side are Yi (i = a, b and c) xy ；
Wherein the third preset formula is as follows:
in the formula, cov (X, Y) represents the covariance of the current-side phase sequence and the current-side phase sequence,
the variance of the current sequence of the present side phase is shown,
the variance of the opposite side phase current sequence is shown.
In some embodiments, when the three-phase differential current is greater than the differential current early warning threshold, the differential current abnormal early warning is started, and the analog quantity data and the recording waveform data are processed, which specifically includes:
and (3) calculating to obtain the second harmonic content THD2i (i = a, b, c) of the three-phase current sequence on the current side in the waveform by using a Fourier analysis method.
In some embodiments, initiating a differential flow anomaly early warning, thereafter further comprising:
and carrying out differential flow abnormity diagnosis according to a preset rule so as to obtain and store a diagnosis result.
In some embodiments, the performing the differential flow anomaly diagnosis according to a preset rule to obtain and store a diagnosis result specifically includes:
and under the condition that the three-phase current amplitude difference does not exceed the threshold value and the current phase difference exceeds the threshold value, judging that the diagnosis result of the line protection device is a time parameter or abnormal communication delay, and recording the diagnosis result into a patrol record.
In some embodiments, the performing the differential flow anomaly diagnosis according to a preset rule to obtain and store a diagnosis result specifically includes:
in analog quantity data obtained twice continuously, if the amplitude difference of three-phase currents exceeds a threshold value and the current phase difference does not exceed the threshold value, judging that the diagnosis result of the line protection device is amplitude parameter abnormality or secondary loop shunting, and recording the diagnosis result into a patrol record.
In some embodiments, the performing the differential flow anomaly diagnosis according to a preset rule to obtain and store a diagnosis result specifically includes:
satisfy | rho at one-phase waveform xy |>0.98、THD2<1% and at least one phase of waveform data satisfies | ρ% xy |<0.98、THD2>Under the condition of 1%, judging that the diagnosis result of the target side protection device is abnormal or neutral line multipoint grounding, and recording the diagnosis result into a patrol record;
wherein, | ρ xy | represents an absolute value of the similarity coefficient, and THD2 represents the second harmonic content.
In some embodiments, the method of obtaining analog data of line protection devices disposed on both sides of a line respectively further includes:
and under the condition that the load current exists in the line protection device, if the maximum value of the three-phase current is judged not to meet the preset condition, the diagnosis result is pushed to a centralized control station or a dispatching master station.
In some embodiments, calculating the differential current pre-warning threshold for current differential protection further comprises:
and under the condition that the three-phase differential current is smaller than the differential current early warning threshold value, pushing a diagnosis result to a centralized control station or a dispatching master station.
According to a second aspect of the embodiments of the present invention, a device for processing a differential flow exception of a high-voltage transmission line is provided.
In some embodiments, the apparatus comprises:
the circuit protection device comprises a data acquisition unit, a data processing unit and a data processing unit, wherein the data acquisition unit is used for respectively acquiring analog quantity data of the circuit protection devices arranged on two sides of a circuit, and the analog quantity data at least comprises three-phase voltage, three-phase current, zero-sequence current and three-phase differential current of the circuit protection devices; the line protection devices arranged on the two sides of the line comprise a line protection device on the side and a line protection device on the opposite side;
the threshold value calculation unit is used for calculating a differential current early warning threshold value of current differential protection if the maximum value of the three-phase current is judged to meet a preset condition under the condition that the load current exists in the line protection device;
and the result generating unit is used for starting differential flow abnormity early warning and processing the analog quantity data and the wave recording waveform data under the condition that the three-phase differential current is greater than the differential flow early warning threshold value.
According to a third aspect of embodiments of the present invention, there is provided a computer apparatus.
In some embodiments, the computer device comprises a memory storing a computer program and a processor implementing the steps of the above method when executing the computer program.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the method for processing the differential current abnormity of the high-voltage transmission line comprises the steps of respectively obtaining analog quantity data of line protection devices arranged on two sides of a line, wherein the analog quantity data at least comprise three-phase voltage, three-phase current, zero-sequence current and three-phase differential current of the line protection devices; under the condition that the load current exists in the line protection device, if the maximum value of the three-phase current is judged to meet a preset condition, calculating a differential current early warning threshold value of current differential protection; and starting differential flow abnormity early warning and processing the analog quantity data and the wave recording waveform data under the condition that the three-phase differential current is greater than the differential flow early warning threshold value. In the line current differential protection differential current abnormity early warning and diagnosis method, differential current abnormity diagnosis is carried out by utilizing three-phase current and waveform data of the current side and the opposite side, so that errors caused by single-side current data diagnosis are overcome, the diagnosis accuracy is improved, and the method is suitable for occasions of deploying station control layer equipment or a main station acquisition system. The problems that in a current differential protection system in the prior art, the diagnosis accuracy rate of differential flow abnormity is low, and fault early warning is not timely are solved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is one of flowcharts illustrating a method for processing a differential flow exception of a high-voltage transmission line according to an exemplary embodiment;
fig. 2 is a second flowchart of a method for handling a differential flow anomaly in a high voltage transmission line according to an exemplary embodiment;
fig. 3 is an exemplary diagram of analog data pushed by the line protection device in the usage scenario;
fig. 4 is an exemplary diagram of a recording waveform pushed by the line protection device in the usage scenario;
fig. 5 is a flowchart of the method for processing the differential flow exception of the high-voltage transmission line in the usage scenario according to the present invention;
fig. 6 is a schematic structural diagram illustrating a differential flow exception handling device for a high-voltage transmission line according to an exemplary embodiment;
FIG. 7 is a schematic block diagram of a computer device shown in accordance with an exemplary embodiment.
Reference numerals:
601-data acquisition unit, 602-threshold calculation unit, 603-result generation unit.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the embodiments herein includes the full breadth of the claims, as well as all available equivalents of the claims. The terms "first," "second," and the like, herein are used solely to distinguish one element from another without requiring or implying any actual such relationship or order between such elements. In practice, a first element can also be referred to as a second element, and vice versa. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a structure, device, or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like herein, as used herein, are defined as orientations or positional relationships based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, mechanical or electrical connections, and communication between two elements, and may include direct connection and indirect connection through intervening media, where the meaning of the terms is to be understood by those skilled in the art as appropriate.
Herein, the term "plurality" means two or more, unless otherwise specified.
Herein, the character "/" indicates that the preceding and following objects are in an "or" relationship. For example, A/B represents: a or B.
Herein, the term "and/or" is an associative relationship describing objects, meaning that three relationships may exist. E.g., a and/or B, represents: a or B, or A and B.
The embodiments and features of the embodiments of the invention may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for processing a differential flow exception of a high voltage transmission line according to an exemplary embodiment.
In a specific embodiment, the method for processing the differential flow exception of the high-voltage transmission line provided by the invention comprises the following steps:
s110: respectively obtaining analog quantity data of line protection devices arranged on two sides of a line, wherein the analog quantity data at least comprise three-phase voltage, three-phase current, zero sequence current and three-phase differential current of the line protection devices. The line protection devices arranged on the two sides of the line comprise a line protection device on the side and a line protection device on the opposite side.
Specifically, when analog quantity data of the line protection device is obtained, the analog quantity data can be obtained by using a secondary equipment online monitoring device in the transformer substation through a preset calling strategy.
Wherein the preset summoning policy is any one of:
firstly, the data are called regularly based on a preset calling period, that is, the data can be called regularly according to a manually set period, so as to meet the real-time requirement of data acquisition and ensure the timeliness of calculation. For example, weekly or daily summons data, etc. may be used as the scenario requires.
And secondly, the analog quantity data is called in response to the fault record wave pushed by the line protection device, and in a specific use scene, the analog quantity data of the protection device can be called when the fault record wave pushed by the protection device is received, that is, the data is acquired only when the fault push is obtained, so that the calculated amount of the system is reduced.
S120: under the condition that the load current exists in the line protection device, if the maximum value of the three-phase currents meets a preset condition, calculating a differential current early warning threshold value of current differential protection; and if the maximum value in the three-phase current is judged not to meet the preset condition, pushing the diagnosis result to a centralized control station or a dispatching master station.
Wherein the preset conditions are as follows: max (Ia, ib, ic) >0.05In; in the formula, in is a rated secondary current of the line protection device, and Ia, ib and Ic are respectively an a-phase current amplitude, a b-phase current amplitude and a c-phase current amplitude acquired by the line protection device at the side.
S130: under the condition that the three-phase differential current is larger than the differential current early warning threshold value, starting differential current abnormal early warning, and processing the analog quantity data and the wave recording waveform data; and under the condition that the three-phase differential current is smaller than the differential current early warning threshold value, pushing a diagnosis result to a centralized control station or a dispatching master station.
In step S120, a first preset formula is used to calculate a differential current early warning threshold value Icdyj of the current differential protection;
wherein the first preset formula is as follows:
Icdyj＝K*max(Ia,Ib,Ic)
in the formula, K is a threshold coefficient, and Ia, ib and Ic are respectively the a-phase current amplitude, the b-phase current amplitude and the c-phase current amplitude acquired by the local side line protection device.
In step S130, the following strategy may be adopted to process the analog data and the recording waveform data.
In some embodiments, when the three-phase differential current is greater than the differential current early warning threshold, the differential current abnormal early warning is started, and the analog quantity data and the recording waveform data are processed, which specifically includes:
calculating to obtain the three-phase current amplitude difference Idda according to a second preset formula ht 、Icdb ht 、Icdc ht Sum phase difference Anga ht 、Angb ht 、Angc ht ；
Wherein the second preset formula comprises:
Icda ht ＝Ia-Iar
Anga ht ＝AngIa-AngIar-180°
Icdb ht ＝Ib-Ibr
Angb ht ＝AngIb-AngIbr-180°
Icdc ht ＝Ic-Icr
Angc ht ＝AngIc-AngIcr-180°
in the formula, ia, ib and Ic are respectively the amplitude of phase a current, the amplitude of phase b current and the amplitude of phase c current which are acquired by the line protection device at the side; iar, ibr and Icr represent a phase-a current amplitude, a phase-b current amplitude and a phase-c current amplitude acquired by an opposite-side line protection device, angIa, angIb and Angic represent a phase-a current phase angle, a phase-b current phase angle and a phase-c current phase angle acquired by the local-side line protection device, and AngIar, angIbr and AngIcr represent a phase-a current phase angle, a phase-b current phase angle and a phase-c current phase angle acquired by the opposite-side line protection device.
In other embodiments, when the three-phase differential current is greater than the differential current early warning threshold, the differential current abnormal early warning is started, and the analog quantity data and the recording waveform data are processed, which specifically includes:
extracting the current sequences of the current sequence of the side and the opposite side in the fault waveform or the waveform started most recently, taking the wave recording starting time as a reference, starting 1 cycle before the starting time and 3 cycles after the starting, and calculating the similarity coefficient rho of the current sequences of the side and the opposite side by using a third preset formula, wherein the current sequences of the side and the opposite side are Xi (i = a, b and c) and the current sequences of the opposite side are Yi (i = a, b and c) xy ；
Wherein the third preset formula is as follows:
in the formula, cov (X, Y) represents the covariance of the current-side phase sequence and the current-side phase sequence,
the variance of the current sequence of the present side phase is shown,
the variance of the opposite side phase current sequence is shown.
In other embodiments, when the three-phase differential current is greater than the differential current early warning threshold, the differential current abnormal early warning is started, and the analog quantity data and the recording waveform data are processed, which specifically includes:
and (3) calculating to obtain the second harmonic content THD2i (i = a, b, c) of the three-phase current sequence on the current side in the waveform by using a Fourier analysis method.
Further, in the method provided by the present invention, as shown in fig. 2, after the start of the early warning of the difference flow anomaly, the following steps are also included:
s140: and carrying out differential flow abnormity diagnosis according to a preset rule to obtain and store a diagnosis result.
Specifically, various strategies may be employed to obtain an anomaly diagnosis result.
Firstly, performing differential flow anomaly diagnosis according to a preset rule to obtain and store a diagnosis result, specifically comprising:
and under the condition that the three-phase current amplitude difference does not exceed the threshold value and the current phase difference exceeds the threshold value, judging that the diagnosis result of the line protection device is a time parameter or abnormal communication delay, and recording the diagnosis result into a patrol record.
Secondly, performing differential flow anomaly diagnosis according to a preset rule to obtain and store a diagnosis result, specifically comprising:
in analog quantity data obtained twice continuously, if the amplitude difference of three-phase current exceeds a threshold value and the current phase difference does not exceed the threshold value, the diagnosis result of the line protection device is judged to be amplitude parameter abnormity or secondary circuit shunting, and the diagnosis result is recorded into a patrol record.
Thirdly, performing differential flow abnormity diagnosis according to a preset rule to obtain and store a diagnosis result, specifically comprising:
satisfy | ρ | in one-phase waveform xy |>0.98、THD2<1% and at least one phase of waveform data satisfies | ρ% xy |<0.98、THD2>Under the condition of 1%, judging that the diagnosis result of the target side protection device is abnormal or neutral line multipoint grounding, and recording the diagnosis result into a patrol record;
wherein, | ρ xy | represents an absolute value of the similarity coefficient, and THD2 represents the second harmonic content.
In the above specific embodiment, the differential current exception handling method for the high-voltage transmission line provided by the present invention includes obtaining analog quantity data of the line protection devices disposed on both sides of the line, respectively, where the analog quantity data at least includes three-phase voltage, three-phase current, zero-sequence current, and three-phase differential current of the line protection devices; under the condition that the load current exists in the line protection device, if the maximum value of the three-phase currents meets a preset condition, calculating a differential current early warning threshold value of current differential protection; and starting differential flow abnormity early warning and processing the analog quantity data and the wave recording waveform data under the condition that the three-phase differential current is greater than the differential flow early warning threshold value. In the line current differential protection differential current abnormity early warning and diagnosis method, differential current abnormity diagnosis is carried out by utilizing three-phase current and waveform data of the current side and the opposite side, so that errors caused by single-side current data diagnosis are overcome, the diagnosis accuracy is improved, and the method is suitable for occasions of deploying station control layer equipment or a master station acquisition system. The problems that in a current differential protection system in the prior art, the diagnosis accuracy of differential flow abnormity is low, and fault early warning is not timely are solved.
For convenience of understanding, the following briefly describes an implementation process of the method for processing the differential flow anomaly of the high-voltage transmission line, which is provided by the present invention, with reference to a usage scenario.
As shown in fig. 3-5, fig. 3 is an exemplary diagram of the analog data pushed by the line protection device in the usage scenario; fig. 4 is an exemplary diagram of a recording waveform pushed by the line protection device in the usage scenario; fig. 5 is a flowchart of the differential flow exception handling method for the high-voltage transmission line in the usage scenario.
Step a, calling analog quantity data of a line protection device by using an online monitoring device of secondary equipment in a transformer substation according to the following rule, wherein the analog quantity data comprises three-phase voltage, three-phase current, zero-sequence current and three-phase differential current of protection devices on two sides; the line protection devices arranged on the two sides of the line comprise a line protection device on the side and a line protection device on the opposite side;
mode 1: the data are summoned periodically according to a manually set period.
Mode 2: and calling the analog quantity data of the protection device when the fault record pushed by the protection device is received.
Step b, judging whether the system has load current: max (Ia, ib, ic) >0.05In (In is the rated secondary current of the device, 1A or 5A), if this condition is met, execute step c, otherwise execute step g.
Step c, calculating a differential current early warning threshold Icdyj of the current differential protection according to the following method:
icdyj = K max (Ia, ib, ic), where K is a threshold coefficient and may be 0.05-0.1.
Step d, judging whether the three-phase differential current calculated in the device exceeds a preset differential current threshold Icdyj:
max(Icda,Icdb,Icdb)>Icdyj
and e, if the difference flow exceeds the preset early warning threshold value, starting the difference flow abnormity early warning, and executing the step e, otherwise, the system records that the difference flow is normal and executes the step g.
Step e, processing the analog quantity data and the wave recording waveform data as follows:
treatment 1: calculating to obtain three-phase current amplitude difference Icda ht 、Icdb ht 、Icdc ht Sum phase difference Anga ht 、Angb ht 、Angc ht ：
Icda ht ＝Ia-Iar；Anga ht ＝AngIa-AngIar-180°
Icdb ht ＝Ib-Ibr；Angb ht ＝AngIb-AngIbr-180°
Icdc ht ＝Ic-Icr；Angc ht ＝AngIc-AngIcr-180°
And (3) treatment 2: extracting a fault waveform corresponding to the analog quantity calling or a three-phase current sequence of the side of the current and the opposite side in a latest starting waveform, taking the wave recording starting time as a reference, 1 cycle before the starting time and 3 cycles after the starting time, and calculating corresponding phase current sequences of the side of the current and the opposite side as Xi (i = a, b and c) and a similarity coefficient rhoxy of the opposite side as Yi (i = a, b and c) respectively as follows:
and (3) treatment: calculating to obtain the content THD2i (i = a, b, c) of the second harmonic of the three-phase current sequence at the current side in the waveform by using a Fourier analysis method;
step f, carrying out differential flow abnormity diagnosis according to the following rules:
criterion 1: current amplitude difference Icda ht 、Icdb ht 、Icdc ht The current phase difference Ang does not exceed the threshold (the current amplitude difference threshold is 0.05 In) ht When the current phase difference exceeds the threshold (15 ° for the current phase difference threshold), it is determined that: the protection device time parameter or the communication delay is abnormal. B, recording the diagnosis result into a patrol record, and entering the step g;
criterion 2: current amplitude difference Icda ht 、Icdb ht 、Icdc ht Over a threshold, current phase difference Ang ht The threshold value is not exceeded, and the two continuous calling data are met; or the waveform similarity coefficient of the differential flow abnormal phase: l ρ xy |>0.98，THD2<1 percent. And (3) judging: the amplitude parameter of the two-side protection device is abnormal or the secondary loop is shunted. B, recording the diagnosis result into a patrol record, and entering the step g;
criterion 3: one-phase waveform satisfying | ρ xy |>0.98，THD2<1%, at least one phase of waveform data satisfies | ρ% xy |<0.98,THD2>1%, judging: the neutral line loop of the present side protection device is abnormal or the neutral line is grounded in multiple points. B, recording the diagnosis result into a patrol record, and entering the step g;
criterion 4: all the above criteria are not satisfied, and the judgment is as follows: other causes result in a differential flow anomaly. D, recording a diagnosis result into a patrol record, and entering the step g;
and g, the secondary equipment online monitoring device pushes the diagnosis result to a centralized control station or a dispatching master station, and the step a is returned.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the method and the system for early warning and diagnosing the differential current abnormity of the line current differential protection, differential current abnormity diagnosis is carried out by utilizing the sampling data and waveforms of the three-phase current of the current side and the three-phase current of the opposite side, so that the accuracy of abnormity diagnosis is improved.
2. According to the method and the system for early warning and diagnosing the differential current abnormity of the line current differential protection, diagnosis criteria of different differential current abnormity are given, and diagnosis precision is improved.
3. The local side and the opposite side three-phase current signals which can be provided by the protection device are adopted, no additional equipment is needed, and the practical application value is high.
According to a second aspect of the embodiments of the present invention, a device for processing a differential flow anomaly of a high-voltage transmission line is provided.
In some embodiments, as shown in fig. 6, the apparatus comprises:
a data obtaining unit 601, configured to obtain analog quantity data of line protection devices disposed on two sides of a line, where the analog quantity data at least includes three-phase voltages, three-phase currents, zero-sequence currents, and three-phase differential currents of the line protection devices; the line protection devices arranged on the two sides of the line comprise a line protection device on the side and a line protection device on the opposite side;
a threshold calculation unit 602, configured to calculate a differential warning threshold of current differential protection if it is determined that a maximum value of the three-phase currents meets a preset condition when a load current exists in the line protection device;
and a result generating unit 603, configured to start a differential current abnormality warning and process the analog data and the recording waveform data when the three-phase differential current is greater than the differential current warning threshold.
In some embodiments, obtaining analog data of the line protection device specifically includes:
and acquiring the analog quantity data by utilizing an online monitoring device of secondary equipment in the transformer substation through a preset calling strategy.
In some embodiments, the preset summons policy is any one of:
periodically calling data based on a preset calling period;
and calling the analog quantity data when responding to the fault recording pushed by the line protection device.
In some embodiments, when it is determined that the maximum value of the three-phase currents satisfies a preset condition, the preset condition is: max (Ia, ib, ic) >0.05In;
wherein In is rated secondary current of the line protection device, and Ia, ib and Ic are respectively a phase-a current amplitude, a phase-b current amplitude and a phase-c current amplitude acquired by the line protection device at the side.
In some embodiments, a first preset formula is used for calculating a differential current early warning threshold value Icdyj of the current differential protection;
wherein the first preset formula is as follows:
Icdyj＝K*max(Ia,Ib,Ic)
in the formula, K is a threshold coefficient, and Ia, ib, and Ic are a phase-a current amplitude, a phase-b current amplitude, and a phase-c current amplitude, which are acquired by the local line protection device, respectively.
In some embodiments, when the three-phase differential current is greater than the differential current early warning threshold, the differential current abnormal early warning is started, and the analog quantity data and the recording waveform data are processed, which specifically includes:
calculating to obtain the three-phase current amplitude difference Icda according to a second preset formula ht 、Icdb ht 、Icdc ht Phase difference Anga ht 、Angb ht 、Angc ht ；
Wherein the second preset formula comprises:
Icda ht ＝Ia-Iar
Anga ht ＝AngIa-AngIar-180°
Icdb ht ＝Ib-Ibr
Angb ht ＝AngIb-AngIbr-180°
Icdc ht ＝Ic-Icr
Angc ht ＝AngIc-AngIcr-180°
in the formula, ia, ib and Ic are respectively the amplitude of phase a current, the amplitude of phase b current and the amplitude of phase c current which are acquired by the line protection device at the side; iar, ibr and Icr represent the amplitude of the phase current of a, the amplitude of the phase current of b and the amplitude of the phase current of c, which are acquired by the opposite side line protection device, on the opposite side line, angIa, angIb and Angic represent the phase angle of the phase current of a, the phase angle of the phase current of b and the phase angle of the phase current of c, which are acquired by the local side line protection device, and AngIar, angIbr and AngIcr represent the phase angle of the phase current of a, the phase angle of the phase current of b and the phase angle of the phase current of c, which are acquired by the opposite side line protection device.
In some embodiments, when the three-phase differential current is greater than the differential current early warning threshold, the differential current abnormal early warning is started, and the analog quantity data and the waveform recording data are processed, which specifically includes:
extracting three-phase current sequences of the side and the opposite side in a fault waveform or a latest starting waveform, taking the wave recording starting time as a reference, 1 cycle before the starting time and 3 cycles after the starting, and calculating corresponding phase current sequences of the side and the opposite side by using a third preset formula, wherein the corresponding phase current sequences of the side and the opposite side are Xi (i = a, b and c) and the similarity coefficient rho of the opposite side current sequences of the side and the opposite side is Yi (i = a, b and c) xy ；
Wherein the third preset formula is as follows:
in the formula, cov (X, Y) represents the covariance of the current-side phase sequence and the current-side phase sequence,
the variance of the current sequence of the present side phase is shown,
the variance of the opposite side phase current sequence is shown.
In some embodiments, when the three-phase differential current is greater than the differential current early warning threshold, the differential current abnormal early warning is started, and the analog quantity data and the recording waveform data are processed, which specifically includes:
and (3) calculating to obtain the second harmonic content THD2i (i = a, b, c) of the three-phase current sequence on the current side in the waveform by using a Fourier analysis method.
In some embodiments, initiating a differential flow anomaly early warning, thereafter further comprising:
and carrying out differential flow abnormity diagnosis according to a preset rule so as to obtain and store a diagnosis result.
In some embodiments, the performing a differential flow anomaly diagnosis according to a preset rule to obtain and store a diagnosis result specifically includes:
and under the condition that the three-phase current amplitude difference does not exceed the threshold value and the current phase difference exceeds the threshold value, judging that the diagnosis result of the line protection device is time parameter or communication delay abnormity, and recording the diagnosis result into an inspection record.
In some embodiments, the performing the differential flow anomaly diagnosis according to a preset rule to obtain and store a diagnosis result specifically includes:
in analog quantity data obtained twice continuously, if the amplitude difference of three-phase current exceeds a threshold value and the current phase difference does not exceed the threshold value, the diagnosis result of the line protection device is judged to be amplitude parameter abnormity or secondary circuit shunting, and the diagnosis result is recorded into a patrol record.
In some embodiments, the performing the differential flow anomaly diagnosis according to a preset rule to obtain and store a diagnosis result specifically includes:
satisfy | ρ | in one-phase waveform xy |>0.98、THD2<1% and at least one phase of waveform data satisfies | ρ% xy |<0.98、THD2>Under the condition of 1%, judging that the diagnosis result of the target side protection device is abnormal or neutral line multipoint grounding, and recording the diagnosis result into a patrol record;
wherein, | ρ xy | represents an absolute value of the similarity coefficient, and THD2 represents a quadratic degreeThe harmonic content.
In some embodiments, the method of obtaining analog data of line protection devices disposed on both sides of a line respectively further includes:
and under the condition that the load current exists in the line protection device, if the maximum value of the three-phase current is judged not to meet the preset condition, the diagnosis result is pushed to a centralized control station or a dispatching master station.
In some embodiments, calculating the differential current pre-warning threshold for current differential protection further comprises:
and under the condition that the three-phase differential current is smaller than the differential current early warning threshold value, pushing a diagnosis result to a centralized control station or a dispatching master station.
In the above specific embodiment, the differential current abnormality processing apparatus for a high-voltage transmission line provided by the present invention obtains analog quantity data of line protection devices disposed on both sides of a line, respectively, where the analog quantity data at least includes three-phase voltage, three-phase current, zero-sequence current, and three-phase differential current of the line protection devices; under the condition that the load current exists in the line protection device, if the maximum value of the three-phase current is judged to meet a preset condition, calculating a differential current early warning threshold value of current differential protection; and starting differential flow abnormity early warning under the condition that the three-phase differential current is greater than the differential flow early warning threshold value, and processing the analog quantity data and the wave recording waveform data. In the line current differential protection differential current abnormity early warning and diagnosis method, differential current abnormity diagnosis is carried out by utilizing three-phase current and waveform data of the current side and the opposite side, so that errors caused by single-side current data diagnosis are overcome, the diagnosis accuracy is improved, and the method is suitable for occasions of deploying station control layer equipment or a main station acquisition system. The problems that in a current differential protection system in the prior art, the diagnosis accuracy of differential flow abnormity is low, and fault early warning is not timely are solved.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing static information and dynamic information data. The network interface of the computer device is used for communicating with an external terminal through a network connection. Which computer program is executed by a processor to carry out the steps of the above-described method embodiments.
Those skilled in the art will appreciate that the architecture shown in fig. 7 is merely a block diagram of some of the structures associated with the inventive arrangements and is not intended to limit the computing devices to which the inventive arrangements may be applied, as a particular computing device may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In an embodiment, there is also provided a computer device comprising a memory and a processor, the memory having stored therein a computer program that, when executed by the processor, performs the steps of the above method embodiments.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases or other media used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The present invention is not limited to the structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (16)
1. A method for processing differential flow abnormity of a high-voltage transmission line is characterized by comprising the following steps:
respectively acquiring analog quantity data of line protection devices arranged on two sides of a line, wherein the analog quantity data at least comprise three-phase voltage, three-phase current, zero-sequence current and three-phase differential current of the line protection devices; the line protection devices arranged on the two sides of the line comprise a line protection device on the side and a line protection device on the opposite side;
under the condition that the load current exists in the line protection device, if the maximum value of the three-phase currents meets a preset condition, calculating a differential current early warning threshold value of current differential protection;
and starting differential flow abnormity early warning under the condition that the three-phase differential current is greater than the differential flow early warning threshold value, and processing the analog quantity data and the wave recording waveform data.
2. The method for processing the differential flow abnormity of the high-voltage transmission line according to claim 1, wherein the obtaining of the analog quantity data of the line protection device specifically comprises:
and acquiring the analog quantity data by utilizing an online monitoring device of secondary equipment in the transformer substation through a preset calling strategy.
3. The method for processing the differential flow exception of the high-voltage transmission line according to claim 2, wherein the preset summoning policy is any one of the following:
periodically calling data based on a preset calling period;
and calling the analog quantity data when responding to the fault record pushed by the line protection device.
4. The method for processing the differential current abnormity of the high-voltage transmission line according to claim 1, wherein when the maximum value of the three-phase currents is judged to meet a preset condition, the preset condition is as follows:
max(Ia,Ib,Ic)>0.05In；
the In is rated secondary current of the line protection device at the side, and the Ia, the Ib and the Ic are respectively a phase a current amplitude, a phase b current amplitude and a phase c current amplitude acquired by the line protection device at the side.
5. The method for processing the differential flow exception of the high-voltage transmission line according to claim 1, characterized in that a first preset formula is used for calculating a differential flow early warning threshold value Icdyj of current differential protection;
wherein the first preset formula is as follows:
Icdyj＝K*max(Ia,Ib,Ic)
in the formula, K is a threshold coefficient, and Ia, ib and Ic are respectively the a-phase current amplitude, the b-phase current amplitude and the c-phase current amplitude acquired by the local side line protection device.
6. The method according to claim 1, wherein when the three-phase differential current is greater than the differential current early warning threshold, a differential current abnormal early warning is started, and the analog quantity data and the recording waveform data are processed, specifically comprising:
calculating to obtain the three-phase current amplitude difference Idda according to a second preset formula ht 、Icdb ht 、Icdc ht Sum phase difference Anga ht 、Angb ht 、Angc ht ；
Wherein the second preset formula comprises:
Icda ht ＝Ia-Iar
Anga ht ＝AngIa-AngIar-180°
Icdb ht ＝Ib-Ibr
Angb ht ＝AngIb-AngIbr-180°
Icdc ht ＝Ic-Icr
Angc ht ＝AngIc-AngIcr-180°
in the formula, ia, ib and Ic are respectively the amplitude of the phase a current, the amplitude of the phase b current and the amplitude of the phase c current acquired by the line protection device at the side; iar, ibr and Icr represent the amplitude of the phase current of a phase, the amplitude of the phase current of b phase and the amplitude of the phase current of c phase acquired by the line protection device on the opposite side, angIa, angIb and Angic represent the phase angle of the phase current of a phase, the phase angle of the phase current of b phase and the phase angle of the phase current of c phase acquired by the line protection device on the current side, and AngIar, angIbr and AngIcr represent the phase angle of the phase current of a phase, the phase angle of the phase current of b phase and the phase angle of the phase current of c phase acquired by the line protection device on the opposite side.
7. The method according to claim 1, wherein when the three-phase differential current is greater than the differential current early warning threshold, a differential current abnormal early warning is started, and the analog quantity data and the recording waveform data are processed, specifically comprising:
extracting three-phase current sequences of the side and the opposite side in a fault waveform or a latest starting waveform, taking the wave recording starting time as a reference, 1 cycle before the starting time and 3 cycles after the starting, and calculating corresponding phase current sequences of the side and the opposite side by using a third preset formula, wherein the corresponding phase current sequences of the side and the opposite side are Xi (i = a, b and c) and the similarity coefficient rho of the opposite side current sequences of the side and the opposite side is Yi (i = a, b and c) xy ；
Wherein the third preset formula is:
in the formula, cov (X, Y) represents the covariance of the current sequence of the current side and the current sequence of the opposite side,
the variance of the current sequence of the present side phase is shown,
the variance of the opposite-side phase current sequence is shown.
8. The method according to claim 1, wherein when the three-phase differential current is greater than the differential current early warning threshold, a differential current abnormal early warning is started, and the analog quantity data and the recording waveform data are processed, specifically comprising:
and (3) calculating to obtain the second harmonic content THD2i (i = a, b, c) of the local three-phase current sequence in the waveform by using a Fourier analysis method.
9. The method for processing the differential flow abnormity of the high-voltage transmission line according to claim 1, wherein the differential flow abnormity early warning is started, and then the method further comprises the following steps:
and carrying out differential flow abnormity diagnosis according to a preset rule so as to obtain and store a diagnosis result.
10. The differential flow anomaly handling method for the high-voltage transmission line according to claim 9, wherein the differential flow anomaly diagnosis is performed according to a preset rule to obtain and store a diagnosis result, and specifically comprises the following steps:
and under the condition that the three-phase current amplitude difference does not exceed the threshold value and the current phase difference exceeds the threshold value, judging that the diagnosis result of the line protection device is time parameter or communication delay abnormity, and recording the diagnosis result into an inspection record.
11. The method for processing the differential flow abnormality of the high-tension transmission line according to claim 9, wherein the differential flow abnormality diagnosis is performed according to a preset rule to obtain and store a diagnosis result, and specifically comprises:
in analog quantity data obtained twice continuously, if the amplitude difference of three-phase current exceeds a threshold value and the current phase difference does not exceed the threshold value, the diagnosis result of the line protection device is judged to be amplitude parameter abnormity or secondary circuit shunting, and the diagnosis result is recorded into a patrol record.
12. The differential flow anomaly handling method for the high-voltage transmission line according to claim 9, wherein the differential flow anomaly diagnosis is performed according to a preset rule to obtain and store a diagnosis result, and specifically comprises the following steps:
satisfy | rho at one-phase waveform xy |>0.98、THD2<1% and at least one phase of waveform data satisfies | ρ% xy |<0.98、THD2>Under the condition of 1%, judging that the diagnosis result of the target side protection device is abnormal or neutral line multipoint grounding, and recording the diagnosis result into a patrol record;
wherein, | ρ xy | represents an absolute value of the similarity coefficient, and THD2 represents the second harmonic content.
13. The method for processing the differential flow anomaly of the high-voltage transmission line according to claim 1, wherein analog quantity data of line protection devices arranged on both sides of the line are respectively obtained, and then the method further comprises the following steps:
and under the condition that the load current exists in the line protection device, if the maximum value of the three-phase current is judged not to meet the preset condition, the diagnosis result is pushed to a centralized control station or a dispatching master station.
14. The differential flow abnormity processing method of the high-voltage transmission line according to claim 1, wherein a differential flow early warning threshold value of current differential protection is calculated, and then the method further comprises the following steps:
and under the condition that the three-phase differential current is smaller than the differential current early warning threshold value, pushing a diagnosis result to a centralized control station or a dispatching master station.
15. A high tension transmission line differential flow exception handling device, its characterized in that, the device includes:
the circuit protection device comprises a data acquisition unit, a data processing unit and a data processing unit, wherein the data acquisition unit is used for respectively acquiring analog quantity data of the circuit protection devices arranged on two sides of a circuit, and the analog quantity data at least comprises three-phase voltage, three-phase current, zero-sequence current and three-phase differential current of the circuit protection devices; the line protection devices arranged on the two sides of the line comprise a line protection device on the side and a line protection device on the opposite side;
the threshold value calculation unit is used for calculating a differential current early warning threshold value of current differential protection if the maximum value of the three-phase current is judged to meet a preset condition under the condition that the load current exists in the line protection device;
and the result generating unit is used for starting differential flow abnormity early warning and processing the analog quantity data and the wave recording waveform data under the condition that the three-phase differential current is greater than the differential flow early warning threshold value.
16. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 14.
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