CN114389241A - Relay protection setting value setting method and device for active power distribution network - Google Patents

Relay protection setting value setting method and device for active power distribution network Download PDF

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Publication number
CN114389241A
CN114389241A CN202111518130.0A CN202111518130A CN114389241A CN 114389241 A CN114389241 A CN 114389241A CN 202111518130 A CN202111518130 A CN 202111518130A CN 114389241 A CN114389241 A CN 114389241A
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value
circuit
fault recording
circuit breaker
recording file
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CN114389241B (en
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陈天英
赵宇皓
李铁成
王献志
刘清泉
李泽
刘世岩
王心蕊
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/006—Calibration or setting of parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems

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Abstract

The invention is suitable for the technical field of electric power, and provides a method and a device for setting a relay protection setting value of an active power distribution network, wherein the method comprises the following steps: acquiring n latest three-phase short-circuit fault recording files of a circuit breaker to be set and associated with a feeder line, determining a maximum short-circuit current value and a first weight value corresponding to each three-phase short-circuit fault recording file, and determining a quick-break protection fixed value based on the maximum short-circuit current value and the first weight value; acquiring m latest non-fault recording files of a circuit breaker to be set and a feeder line associated with the circuit breaker, determining a non-fault current maximum value and a second weight value corresponding to each non-fault recording file, and determining an overcurrent protection fixed value based on the non-fault current maximum value and the second weight value; and performing relay protection constant value setting on the circuit breaker to be set based on the quick-break protection constant value and the overcurrent protection constant value. The method and the device can accurately set the relay protection fixed value of the power distribution network.

Description

Relay protection setting value setting method and device for active power distribution network
Technical Field
The invention belongs to the technical field of electric power, and particularly relates to a relay protection setting value setting method and device for an active power distribution network.
Background
The distribution network is composed of a feeder line, and a plurality of circuit breakers are distributed on the feeder line. During the process of transmitting electric energy in the distribution network, various faults, such as three-phase short circuit, two-phase short circuit and the like, can occur, and the faults often cause damage to equipment or feeders, thereby causing great property loss. In order to avoid equipment damage caused by feeder line faults, people install some wave recorders on the feeder lines for collecting circuit parameters when faults occur, and when some parameters reach corresponding relay protection fixed values, the associated circuit breakers are disconnected, so that the normal operation of other feeder lines is ensured, and meanwhile, the damage of power distribution network equipment is avoided.
However, in the prior art, the relay protection setting value of the power distribution network is usually set manually by depending on the experience of an engineer, and the accuracy of the relay protection setting value is poor. And, with a large amount of new energy access electric power system, distribution network structure presents variety and complexity, and setting of relay protection constant value is more difficult.
Disclosure of Invention
In view of this, the embodiment of the invention provides a method and a device for setting a relay protection setting value of an active power distribution network, so as to solve the problem that the relay protection setting value is difficult to accurately set in the prior art.
The first aspect of the embodiment of the invention provides a relay protection fixed value setting method for an active power distribution network, wherein the relay protection fixed value comprises a quick-break protection fixed value and an overcurrent protection fixed value; the method comprises the following steps:
acquiring n latest three-phase short-circuit fault recording files of a feeder line associated with a circuit breaker to be set, determining a maximum short-circuit current value and a first weight value corresponding to each three-phase short-circuit fault recording file, and determining a quick-break protection fixed value of the circuit breaker to be set based on the maximum short-circuit current value and the first weight value;
acquiring m latest non-fault recording files of a feeder line associated with the circuit breaker to be set, determining a maximum non-fault current value and a second weight value corresponding to each non-fault recording file, and determining an overcurrent protection fixed value of the circuit breaker to be set based on the maximum non-fault current value and the second weight value;
based on the quick-break protection fixed value and the overcurrent protection fixed value, carrying out relay protection fixed value setting on the circuit breaker to be set; wherein n and m are preset positive integer values.
Optionally, determining a first weight value corresponding to each three-phase short-circuit fault recording file includes:
acquiring the distance between a fault point corresponding to the three-phase short-circuit fault recording file and a wave recorder for generating the three-phase short-circuit fault recording file and the length of a feeder line associated with a circuit breaker to be set, and determining a position coefficient corresponding to the three-phase short-circuit fault recording file according to the proportion of the distance to the length;
obtaining the generation time of the three-phase short-circuit fault recording file, calculating the time difference between the generation time and the time to be set, and obtaining the time difference according to the time difference
Figure BDA0003407606870000021
Determining a time coefficient corresponding to the three-phase short-circuit fault recording file; in the formula, F (Δ t)k) As a time coefficient, Δ tkIn order to be the time difference between the two,
Figure BDA0003407606870000022
according to Gk＝αDk+βF(Δtk) Determining a first weight value corresponding to the three-phase short-circuit fault recording file; in the formula, GkIs firstWeight value, DkFor the position coefficient, α + β is 1.
Optionally, the formula for determining the quick-break protection fixed value of the circuit breaker to be set is as follows:
Figure BDA0003407606870000023
in the formula IkIn order to quickly break the protection constant value,
Figure BDA0003407606870000024
is a first weighted value corresponding to the ith three-phase short-circuit fault recording file,
Figure BDA0003407606870000025
and the maximum value of the short-circuit current corresponding to the ith three-phase short-circuit fault recording file.
Optionally, determining a second weight value corresponding to each non-fault recording file includes:
obtaining the generation time of the non-fault recording file, calculating the time difference between the generation time and the time to be set, and determining a second weight value corresponding to the non-fault recording file according to the following formula
Figure BDA0003407606870000026
In the formula, T (Δ T)l) Is a second weight value, Δ tlIs a time difference of>Δtl+1。
Optionally, the formula for determining the overcurrent protection constant value of the circuit breaker to be set is
Figure BDA0003407606870000031
In the formula IlIn order to fix the value of the over-current protection,
Figure BDA0003407606870000032
for the ith non-fault recording fileA second weight value, wherein the weight value,
Figure BDA0003407606870000033
and the maximum value of the non-fault current corresponding to the ith non-fault recording file.
Optionally, after obtaining the quick-break protection fixed value and the overcurrent protection fixed value, the method further includes:
carrying out sensitivity check on the quick-break protection fixed value and the overcurrent protection fixed value;
if the check result shows that the quick-break protection constant value does not meet the preset sensitivity requirement, acquiring N + N latest three-phase short-circuit fault recording files of the feeder line associated with the circuit breaker to be set, and recalculating the quick-break protection constant value of the circuit breaker to be set; wherein N is a preset positive integer value;
if the check result shows that the over-current protection constant value does not meet the preset sensitivity requirement, acquiring M + M latest non-fault recording files of the feeder line associated with the circuit breaker to be set, and recalculating the over-current protection constant value of the circuit breaker to be set; wherein M is a preset positive integer value.
Optionally, the sensitivity verification is performed on the quick-break protection fixed value and the overcurrent protection fixed value, and the method includes:
acquiring q latest two-phase short-circuit fault recording files of a circuit breaker to be set and an associated feeder line;
determining a check value according to q latest two-phase short-circuit fault recording files;
according to Kk＝Iv/IkCalculating the sensitivity of a quick-break protection fixed value, and if the sensitivity of the quick-break protection fixed value is smaller than a first preset threshold, judging that the quick-break protection fixed value does not meet the preset sensitivity requirement; wherein, KkConstant sensitivity for quick-break protection, IvTo check the value, IkSetting a protection constant value for quick disconnection;
according to Kl＝Iv/IlCalculating the sensitivity of the over-current protection fixed value, and if the sensitivity of the over-current protection fixed value is smaller than a second preset threshold, judging that the over-current protection fixed value does not meet the preset sensitivity requirement; wherein, KlSensitivity of constant value for overcurrent protection, IvTo check the value, IlAnd the value is fixed for overcurrent protection.
A second aspect of the embodiments of the present invention provides a relay protection setting value setting device for an active power distribution network, including:
the circuit breaker setting device comprises a first processing module, a second processing module and a third processing module, wherein the first processing module is used for acquiring n latest three-phase short-circuit fault recording files of a feeder line associated with a circuit breaker to be set, determining a maximum short-circuit current value and a first weight value corresponding to each three-phase short-circuit fault recording file, and determining a quick-break protection fixed value of the circuit breaker to be set based on the maximum short-circuit current value and the first weight value;
the second processing module is used for acquiring m latest non-fault recording files of the feeder line associated with the circuit breaker to be set, determining a maximum non-fault current value and a second weight value corresponding to each non-fault recording file, and determining an overcurrent protection fixed value of the circuit breaker to be set based on the maximum non-fault current value and the second weight value;
the setting module is used for setting a relay protection constant value of the circuit breaker to be set based on the quick-break protection constant value and the overcurrent protection constant value; wherein n and m are preset positive integer values.
A third aspect of the embodiments of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the relay protection fixed value setting method for an active power distribution network as described above when executing the computer program.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the relay protection constant value setting method for an active power distribution network are implemented as described above.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, a traditional setting principle is not relied on, the latest n three-phase short-circuit fault recording files of the feeder line are analyzed to obtain the quick-break protection fixed value, the latest m non-fault recording files of the feeder line are analyzed to obtain the overcurrent protection fixed value, and then the relay protection fixed value of the power distribution network is set based on the quick-break protection fixed value and the overcurrent protection fixed value. Compared with a mode of setting the relay protection constant value according to manual experience, the method can carry out real-time dynamic setting according to the recording file, and accuracy of the relay protection constant value is improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a power distribution network provided in an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating an implementation of a relay protection constant value setting method for an active power distribution network according to an embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating an implementation of a relay protection constant value setting method for an active power distribution network according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a relay protection fixed value setting device of an active power distribution network according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
The traditional power distribution network is mainly of a single-power-supply radial structure, and the power distribution network is simple in structure, small in investment and convenient to maintain. After the large-scale distributed power supply is connected into the power distribution network, the original structural characteristics of the power distribution network are changed, the matching between the short-circuit current distribution and the relay protection of the power distribution network is affected, the sensitivity and the selectivity of the relay protection are reduced, and if the configuration and the fixed value of the conventional protection and automatic device cannot adapt to the change, incorrect actions of the relay protection device can be caused, and accidents are expanded or equipment is damaged.
At present, the relay protection setting of a power distribution network is in a stage with qualitative analysis as a main stage and empirical analysis as an auxiliary stage, the automation level of fault online monitoring and setting management is relatively lagged, along with the large-scale construction of a novel power system with new energy as a main part, the distribution of a power distribution network line structure and distribution power loads presents diversity and complexity, the influence of distributed power sources with different positions, different quantities and different capacities on the setting needs to be considered in the setting calculation of the setting of the power distribution network, and the calculation process becomes abnormal and tedious, even the situation that the setting cannot be performed occurs. Although the relay protection setting value automatic setting system used in individual areas can replace manual calculation, the problem of difficult setting value caused by variable distribution network structures due to large-scale distributed power supply access is not solved.
The embodiment of the invention provides a relay protection constant value setting method for an active power distribution network, wherein the relay protection constant value comprises a quick-break protection constant value and an overcurrent protection constant value.
Referring to fig. 1, the relay protection fixed value setting method for the active power distribution network includes:
s101, acquiring n latest three-phase short-circuit fault recording files of a feeder line associated with a circuit breaker to be set, determining a maximum short-circuit current value and a first weight value corresponding to each three-phase short-circuit fault recording file, and determining a quick-break protection fixed value of the circuit breaker to be set based on the maximum short-circuit current value and the first weight value.
Step S102, m latest non-fault recording files of the feeder line associated with the circuit breaker to be set are obtained, the maximum value of non-fault current and a second weight value corresponding to each non-fault recording file are determined, and the overcurrent protection fixed value of the circuit breaker to be set is determined based on the maximum value of the non-fault current and the second weight value.
S103, setting a relay protection constant value of the circuit breaker to be set based on the quick-break protection constant value and the overcurrent protection constant value; wherein n and m are preset positive integer values.
In the embodiment of the present invention, a structure of the power distribution network is first described.
Referring to fig. 2, the distribution network is composed of a feeder, both ends of the feeder are usually provided with a breaker K, and the middle part of the feeder may be provided with a plurality of breakers. In order to realize the safe operation of the power distribution network, various parameters of the power distribution network need to be recorded, so that a wave recorder is installed on the feeder line and used for recording various parameters of the feeder line during the fault, such as current, voltage, the time length of the breaker disconnection after the fault occurs, and the like. The circuit breaker associated with the feeder is usually a circuit breaker at the head end of the feeder, and when the feeder fails, the circuit breaker at the head end of the feeder is opened to form protection. Therefore, in the embodiment, the quick-break protection constant value and the overcurrent protection constant value of the circuit breaker to be set can be determined by analyzing the wave recording file recorded by the wave recorder on the feeder line.
The non-fault wave recording file refers to a wave recording file which is caused by the change of the current of the feeder line and has a wave recording function but not a fault of the feeder line. After the three-phase short-circuit fault recording file and the non-fault recording file associated with the feeder line are obtained, whether the recording file is an in-region fault file or not can be judged.
The method for judging whether the recording file is an intra-area fault file comprises the following steps:
and if the wave recording file is only associated with the circuit breaker on the power supply side, the file is an in-region fault file.
If the wave recording file is associated with the circuit breaker on the power supply side and the circuit breaker on the load side, the wave recording file is an out-of-area fault file, cannot be used and needs to be selected again.
It can be understood that, if a certain wave recording file is associated with the feeder line power source side circuit breaker and the load side circuit breaker at the same time, the wave recording file may be generated by a fault in the next section of the feeder line, and is an out-of-area fault file.
Optionally, in step S101, a first weight value corresponding to each three-phase short-circuit fault recording file is determined, which may be detailed as follows:
acquiring the distance between a fault point corresponding to the three-phase short-circuit fault recording file and a wave recorder for generating the three-phase short-circuit fault recording file and the length of a feeder line associated with a circuit breaker to be set, and determining a position coefficient corresponding to the three-phase short-circuit fault recording file according to the proportion of the distance to the length;
obtaining the generation time of the three-phase short-circuit fault recording file, calculating the time difference between the generation time and the time to be set, and obtaining the time difference according to the time difference
Figure BDA0003407606870000071
Determining a time coefficient corresponding to the three-phase short-circuit fault recording file; in the formula, F (Δ t)k) As a time coefficient, Δ tkIn order to be the time difference between the two,
Figure BDA0003407606870000072
according to Gk＝αDk+βF(Δtk) Determining a first weight value corresponding to the three-phase short-circuit fault recording file; in the formula, GkIs a first weight value, DkFor the position coefficient, α + β is 1.
Optionally, in step S101, a formula for determining a quick-break protection fixed value of the circuit breaker to be set is as follows:
Figure BDA0003407606870000073
in the formula IkIn order to quickly break the protection constant value,
Figure BDA0003407606870000074
is a first weighted value corresponding to the ith three-phase short-circuit fault recording file,
Figure BDA0003407606870000075
recording the ith three-phase short-circuit faultAnd the wave file corresponds to the maximum value of the short-circuit current.
In the embodiment of the invention, the quick-break protection adopts the mode of improving the setting value to realize instantaneous action, the action is considered according to the condition of avoiding the short-circuit current under the maximum operation mode, the maximum operation mode refers to the mode that the system has the minimum short-circuit impedance value and the short-circuit current generated after short circuit occurs is the maximum, and the three-phase short-circuit current is the maximum in all faults, so the three-phase short-circuit fault recording file is used for calculating the quick-break protection setting value.
Specifically, the weight value of each three-phase short-circuit fault recording file is comprehensively determined by analyzing the transverse factors and the longitudinal factors of each three-phase short-circuit fault recording file, and the quick-break protection fixed value is determined according to the weight value and the maximum short-circuit current value of each three-phase short-circuit fault recording file. The longitudinal factor is a position coefficient, namely the distance between a fault point corresponding to the three-phase short-circuit fault recording file and a wave recorder for generating the three-phase short-circuit fault recording file accounts for the proportion of the length of the associated feeder line of the circuit breaker to be set, and the larger the proportion is, the more stable the parameters recorded by the wave recorder are, and the more important the three-phase short-circuit fault recording file is. The transverse factor is a time coefficient, the calculation is carried out according to the generation time of the three-phase short-circuit fault recording file, the later generation time, the larger the reference value of the three-phase short-circuit fault recording file is, and the exponential function of the time coefficient always passes through the point of (0,1), namely if delta tkIf the value is 0, the recording file is the recording file which is most needed at the setting moment and is most expected to be seen, and then F (delta t) is set through setting the value range of ek) The time coefficient is limited between 0.5 and 1, namely the time coefficient cannot be less than 0.5, the exponential function is a concave function in the value range, the method is more practical, the fixed value calculation is more accurate, and the action of the protection device is more reliable. And finally, determining the weight value of each three-phase short-circuit fault recording file based on the position coefficient and the time coefficient, carrying out weighted average on the maximum short-circuit current of each three-phase short-circuit fault recording file based on the weight value, and determining a quick-break protection fixed value.
Optionally, in step S102, a second weight value corresponding to each non-fault recording file is determined, which may be detailed as follows:
obtaining the generation time of the non-fault recording file, calculating the time difference between the generation time and the time to be set, and determining a second weight value corresponding to the non-fault recording file according to the following formula
Figure BDA0003407606870000081
In the formula, T (Δ T)l) Is a second weight value, Δ tlIs a time difference of>Δtl+1。
Optionally, in step S102, the formula for determining the overcurrent protection constant value of the circuit breaker to be set is
Figure BDA0003407606870000082
In the formula IlIn order to fix the value of the over-current protection,
Figure BDA0003407606870000083
a second weight value corresponding to the ith non-fault recording file,
Figure BDA0003407606870000084
and the maximum value of the non-fault current corresponding to the ith non-fault recording file.
In the embodiment of the invention, because the overcurrent protection is set according to the maximum load current of the avoiding system, under normal load, the wave recording device is not started and has no wave recording file, and the starting of the wave recording device is that the current exceeds a certain limit value, the maximum load current adopts the wave recording file which is just started by the wave recording device but is not in fault, namely the non-fault wave recording file.
Specifically, the weighted value of the non-fault recording file is calculated through the generation time, and the maximum non-fault current of each non-fault recording file is weighted and averaged to determine the overcurrent protection fixed value.
Optionally, after obtaining the quick-break protection fixed value and the overcurrent protection fixed value, the method further includes:
carrying out sensitivity check on the quick-break protection fixed value and the overcurrent protection fixed value;
if the check result shows that the quick-break protection constant value does not meet the preset sensitivity requirement, acquiring N + N latest three-phase short-circuit fault recording files of the feeder line associated with the circuit breaker to be set, and recalculating the quick-break protection constant value of the circuit breaker to be set; wherein N is a preset positive integer value;
if the check result shows that the over-current protection constant value does not meet the preset sensitivity requirement, acquiring M + M latest three-phase short-circuit fault recording files of the feeder line associated with the circuit breaker to be set, and recalculating the over-current protection constant value of the circuit breaker to be set; wherein M is a preset positive integer value.
In the embodiment of the present invention, for example, N and N may be set to 3, that is, the latest 3 three-phase short-circuit fault recording files are selected to calculate the fast-break protection constant value, when the fast-break protection constant value does not satisfy the preset sensitivity requirement, 6 three-phase short-circuit fault recording files may be selected to calculate the fast-break protection constant value, and so on until the fast-break protection constant value satisfies the sensitivity requirement. The verification process of the overcurrent protection constant value is similar to the verification process.
Optionally, the sensitivity verification is performed on the quick-break protection fixed value and the overcurrent protection fixed value, and the method includes:
acquiring q latest two-phase short-circuit fault recording files of a circuit breaker to be set and an associated feeder line;
determining a check value according to q latest two-phase short-circuit fault recording files;
according to Kk＝Iv/IkCalculating the sensitivity of a quick-break protection fixed value, and if the sensitivity of the quick-break protection fixed value is smaller than a first preset threshold, judging that the quick-break protection fixed value does not meet the preset sensitivity requirement; wherein, KkConstant sensitivity for quick-break protection, IvTo check the value, IkSetting a protection constant value for quick disconnection;
according to Kl＝Iv/IlCalculating the sensitivity of the over-current protection fixed value, and if the sensitivity of the over-current protection fixed value is smaller than a second preset threshold, judging that the over-current protection fixed value does not meet the preset sensitivity requirement; wherein，KlSensitivity of constant value for overcurrent protection, IvTo check the value, IlAnd the value is fixed for overcurrent protection.
In the embodiment of the invention, under the operation mode that the sensitivity is minimum, the fixed value set by the protection device can also enable the protection device to act, and when two phases are in short circuit, the short circuit current is minimum, so that the sensitivity verification uses a two-phase short circuit recording file. Specifically, q latest two-phase short-circuit fault recording files are selected, the weight of each two-phase short-circuit fault recording file is calculated, the calculation method is the same as the weight calculation method of the three-phase short-circuit fault recording file, namely, the position coefficient and the time coefficient are calculated according to the following formula:
Figure BDA0003407606870000101
Figure BDA0003407606870000102
in the formula, DvIs a position coefficient, xvThe distance s between the fault point corresponding to the two-phase short-circuit fault recording file and the wave recorder for generating the two-phase short-circuit fault recording filevTo correlate the length of the feed line, F (Δ t)v) As a time coefficient, Δ tvAnd the time difference between the generation time of the two-phase short-circuit fault recording file and the time to be set is obtained.
The weights are determined according to:
Gv＝χDk+δF(Δtv)
in the formula, GvAs a weight, χ + δ is 1.
Carrying out weighted average on the maximum short-circuit current of each two-phase short-circuit fault recording file to obtain a check value:
Figure BDA0003407606870000103
in the formula IvIn order to verify the value of the data,
Figure BDA0003407606870000104
the weighted value corresponding to the ith two-phase short-circuit fault recording file,
Figure BDA0003407606870000105
and the maximum value of the short-circuit current corresponding to the ith two-phase short-circuit fault recording file.
In the embodiment of the present invention, both the first preset threshold and the second preset threshold may be set to 1.5, that is, when the sensitivity of the quick-break protection constant value or the sensitivity of the overcurrent protection constant value is less than 1.5, the sensitivity requirement is not met.
Based on the above, referring to fig. 3, the overall process of the embodiment of the present invention is as follows:
(1) determining a circuit breaker to be set;
(2) selecting related wave recording files and judging whether the wave recording files are in-zone fault files or not, and if the wave recording files are out-zone fault files, re-selecting the related wave recording files;
(3) determining a maximum value of short-circuit current and a first weight value based on a three-phase short-circuit fault recording file, and determining a quick-break protection fixed value of a circuit breaker to be set based on the maximum value of the short-circuit current and the first weight value;
(4) determining a maximum value and a second weight value of a non-fault current based on the non-fault recording file, and determining an overcurrent protection fixed value of the circuit breaker to be set based on the maximum value and the second weight value of the non-fault current;
(5) determining a check value based on the two-phase short-circuit fault recording file;
(6) the quick-break protection fixed value and the overcurrent protection fixed value are checked, whether the quick-break protection fixed value and the overcurrent protection fixed value meet the sensitivity requirement or not is judged, and if the quick-break protection fixed value and the overcurrent protection fixed value meet the sensitivity requirement, the relay protection fixed value is set for the circuit breaker to be set; if not, the recording file is reselected to calculate the quick-break protection constant value or the overcurrent protection constant value.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Referring to fig. 4, an embodiment of the present invention provides a relay protection setting value setting device for an active power distribution network, where the relay protection setting value setting device 40 for the active power distribution network includes:
the first processing module 41 is configured to obtain n latest three-phase short-circuit fault recording files of a feeder line associated with the circuit breaker to be set, determine a maximum short-circuit current value and a first weight value corresponding to each three-phase short-circuit fault recording file, and determine a quick-break protection fixed value of the circuit breaker to be set based on the maximum short-circuit current value and the first weight value.
The second processing module 42 is configured to obtain m latest non-fault recording files of the feeder line associated with the circuit breaker to be set, determine a maximum non-fault current value and a second weight value corresponding to each non-fault recording file, and determine an overcurrent protection fixed value of the circuit breaker to be set based on the maximum non-fault current value and the second weight value.
The setting module 43 is configured to perform relay protection constant value setting on the circuit breaker to be set based on the quick-break protection constant value and the overcurrent protection constant value; wherein n and m are preset positive integer values.
Optionally, the first processing module 41 is specifically configured to,
acquiring the distance between a fault point corresponding to the three-phase short-circuit fault recording file and a wave recorder for generating the three-phase short-circuit fault recording file and the length of a feeder line associated with a circuit breaker to be set, and determining a position coefficient corresponding to the three-phase short-circuit fault recording file according to the proportion of the distance to the length;
obtaining the generation time of the three-phase short-circuit fault recording file, calculating the time difference between the generation time and the time to be set, and obtaining the time difference according to the time difference
Figure BDA0003407606870000111
Determining a time coefficient corresponding to the three-phase short-circuit fault recording file; in the formula, F (Δ t)k) As a time coefficient, Δ tkIn order to be the time difference between the two,
Figure BDA0003407606870000112
according to Gk＝αDk+βF(Δtk) Determining a first weight value corresponding to the three-phase short-circuit fault recording file; in the formula, GkIs a first weight value, DkFor the position coefficient, α + β is 1.
Optionally, the formula for determining the quick-break protection fixed value of the circuit breaker to be set is as follows:
Figure BDA0003407606870000121
in the formula IkIn order to quickly break the protection constant value,
Figure BDA0003407606870000122
is a first weighted value corresponding to the ith three-phase short-circuit fault recording file,
Figure BDA0003407606870000123
and the maximum value of the short-circuit current corresponding to the ith three-phase short-circuit fault recording file.
Optionally, the second processing module 42 is specifically configured to:
obtaining the generation time of the non-fault recording file, calculating the time difference between the generation time and the time to be set, and determining a second weight value corresponding to the non-fault recording file according to the following formula
Figure BDA0003407606870000124
In the formula, T (Δ T)l) Is a second weight value, Δ tlIs a time difference of>Δtl+1。
Optionally, the formula for determining the overcurrent protection constant value of the circuit breaker to be set is
Figure BDA0003407606870000125
In the formula IlIn order to fix the value of the over-current protection,
Figure BDA0003407606870000126
a second weight value corresponding to the ith non-fault recording file,
Figure BDA0003407606870000127
and the maximum value of the non-fault current corresponding to the ith non-fault recording file.
Optionally, after obtaining the quick-break protection fixed value, the first processing module 41 is further configured to:
carrying out sensitivity check on the quick-break protection fixed value;
if the check result shows that the quick-break protection constant value does not meet the preset sensitivity requirement, acquiring N + N latest three-phase short-circuit fault recording files of the feeder line associated with the circuit breaker to be set, and recalculating the quick-break protection constant value of the circuit breaker to be set; wherein, N is a preset positive integer value.
Optionally, after obtaining the over-current protection fixed value, the second processing module 42 is further configured to:
carrying out sensitivity check on the overcurrent protection fixed value;
if the check result shows that the over-current protection constant value does not meet the preset sensitivity requirement, acquiring M + M latest non-fault recording files of the feeder line associated with the circuit breaker to be set, and recalculating the over-current protection constant value of the circuit breaker to be set; wherein M is a preset positive integer value.
Optionally, the sensitivity verification is performed on the quick-break protection fixed value and the overcurrent protection fixed value, and the method includes:
acquiring q latest two-phase short-circuit fault recording files of a circuit breaker to be set and an associated feeder line;
determining a check value according to q latest two-phase short-circuit fault recording files;
according to Kk＝Iv/IkCalculating the sensitivity of a quick-break protection fixed value, and if the sensitivity of the quick-break protection fixed value is smaller than a first preset threshold, judging that the quick-break protection fixed value does not meet the preset sensitivity requirement; wherein, KkConstant sensitivity for quick-break protection, IvTo check the value, IkSetting a protection constant value for quick disconnection;
according to Kl＝Iv/IlCalculating the sensitivity of the over-current protection fixed value, and if the sensitivity of the over-current protection fixed value is smaller than a second preset threshold, judging that the over-current protection fixed value does not meet the preset sensitivity requirement; wherein, KlSensitivity of constant value for overcurrent protection, IvTo check the value, IlFor over-current protection
Fig. 5 is a schematic diagram of an electronic device 50 according to an embodiment of the present invention. As shown in fig. 5, the electronic apparatus 50 of this embodiment includes: a processor 51, a memory 52 and a computer program 53 stored in the memory 52 and operable on the processor 51, such as a relay protection setting program. When the processor 51 executes the computer program 53, the steps in the relay protection setting method embodiment of each active power distribution network described above are implemented, for example, steps S101 to S103 shown in fig. 1. Alternatively, the processor 51 implements the functions of the modules in the above-described device embodiments, such as the functions of the modules 41 to 44 shown in fig. 4, when executing the computer program 53.
Illustratively, the computer program 53 may be divided into one or more modules/units, which are stored in the memory 52 and executed by the processor 51 to carry out the invention. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 53 in the electronic device 50. For example, the computer program 53 may be divided into the first processing module 41, the second processing module 42, and the setting module 43 (a module in the virtual device), and the specific functions of each module are as follows:
the first processing module 41 is configured to obtain n latest three-phase short-circuit fault recording files of a feeder line associated with the circuit breaker to be set, determine a maximum short-circuit current value and a first weight value corresponding to each three-phase short-circuit fault recording file, and determine a quick-break protection fixed value of the circuit breaker to be set based on the maximum short-circuit current value and the first weight value.
The second processing module 42 is configured to obtain m latest non-fault recording files of the feeder line associated with the circuit breaker to be set, determine a maximum non-fault current value and a second weight value corresponding to each non-fault recording file, and determine an overcurrent protection fixed value of the circuit breaker to be set based on the maximum non-fault current value and the second weight value.
The setting module 43 is configured to perform relay protection constant value setting on the circuit breaker to be set based on the quick-break protection constant value and the overcurrent protection constant value; wherein n and m are preset positive integer values.
The electronic device 50 may be a desktop computer, a notebook, a palm top computer, a cloud server, or other computing devices. The electronic device 50 may include, but is not limited to, a processor 51, a memory 52. Those skilled in the art will appreciate that fig. 5 is merely an example of an electronic device 50 and does not constitute a limitation of electronic device 50 and may include more or fewer components than shown, or combine certain components, or different components, e.g., electronic device 50 may also include input-output devices, network access devices, buses, etc.
The Processor 51 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 52 may be an internal storage unit of the electronic device 50, such as a hard disk or a memory of the electronic device 50. The memory 52 may also be an external storage device of the electronic device 50, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the electronic device 50. Further, the memory 52 may also include both internal storage units of the electronic device 50 and external storage devices. The memory 52 is used for storing computer programs and other programs and data required by the electronic device 50. The memory 52 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/electronic device and method may be implemented in other ways. For example, the above-described apparatus/electronic device embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logic function, and may be implemented in other ways, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the embodiments of the present invention may also be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of the embodiments of the method. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. A relay protection constant value setting method for an active power distribution network is characterized in that the relay protection constant value comprises a quick-break protection constant value and an overcurrent protection constant value; the method comprises the following steps:
acquiring n latest three-phase short-circuit fault recording files of a feeder line associated with a circuit breaker to be set, determining a maximum short-circuit current value and a first weight value corresponding to each three-phase short-circuit fault recording file, and determining a quick-break protection fixed value of the circuit breaker to be set based on the maximum short-circuit current value and the first weight value;
acquiring m latest non-fault recording files of the feeder line associated with the circuit breaker to be set, determining a non-fault current maximum value and a second weight value corresponding to each non-fault recording file, and determining an overcurrent protection fixed value of the circuit breaker to be set based on the non-fault current maximum value and the second weight value;
setting a relay protection constant value of the circuit breaker to be set based on the quick-break protection constant value and the overcurrent protection constant value; wherein n and m are preset positive integer values.
2. The relay protection constant value setting method for the active power distribution network according to claim 1, wherein determining the first weight value corresponding to each three-phase short-circuit fault recording file comprises:
acquiring the distance between a fault point corresponding to the three-phase short-circuit fault recording file and a wave recorder for generating the three-phase short-circuit fault recording file and the length of a feeder line associated with a circuit breaker to be set, and determining a position coefficient corresponding to the three-phase short-circuit fault recording file according to the proportion of the distance in the length;
obtaining the generation time of the three-phase short-circuit fault recording file, calculating the time difference between the generation time and the time to be set, and obtaining the time difference according to the time difference
Figure FDA0003407606860000011
Determining a time coefficient corresponding to the three-phase short-circuit fault recording file; in the formula, F (Δ t)k) As a time coefficient, Δ tkIn order to be the time difference between the two,
Figure FDA0003407606860000012
according to Gk＝αDk+βF(Δtk) Determining a first weight value corresponding to the three-phase short-circuit fault recording file; in the formula, GkIs a first weight value, DkFor the position coefficient, α + β is 1.
3. The relay protection constant value setting method for the active power distribution network according to claim 2, wherein a formula for determining the quick-break protection constant value of the circuit breaker to be set is:
Figure FDA0003407606860000021
in the formula IkIn order to quickly break the protection constant value,
Figure FDA0003407606860000022
is a first weighted value corresponding to the ith three-phase short-circuit fault recording file,
Figure FDA0003407606860000023
and the maximum value of the short-circuit current corresponding to the ith three-phase short-circuit fault recording file.
4. The relay protection constant value setting method for the active power distribution network according to claim 1, wherein determining a second weight value corresponding to each non-fault recording file comprises:
obtaining the generation time of the non-fault recording file, calculating the time difference between the generation time and the time to be set, and determining a second weight value corresponding to the non-fault recording file according to the following formula
Figure FDA0003407606860000024
In the formula, T (Δ T)l) Is a second weight value, Δ tlIs a time difference of>Δtl+1。
5. The relay protection constant value setting method for the active power distribution network according to claim 4, wherein a formula for determining the overcurrent protection constant value of the circuit breaker to be set is
Figure FDA0003407606860000025
In the formula IlIn order to fix the value of the over-current protection,
Figure FDA0003407606860000026
a second weight value corresponding to the ith non-fault recording file,
Figure FDA0003407606860000027
and the maximum value of the non-fault current corresponding to the ith non-fault recording file.
6. The relay protection constant value setting method for the active power distribution network according to claim 1, further comprising, after obtaining the quick-break protection constant value and the overcurrent protection constant value:
carrying out sensitivity check on the quick-break protection fixed value and the overcurrent protection fixed value;
if the check result shows that the quick-break protection fixed value does not meet the preset sensitivity requirement, acquiring N + N latest three-phase short-circuit fault recording files of the feeder line associated with the circuit breaker to be set, and recalculating the quick-break protection fixed value of the circuit breaker to be set; wherein N is a preset positive integer value;
if the check result shows that the over-current protection fixed value does not meet the preset sensitivity requirement, acquiring M + M latest non-fault recording files of the feeder line associated with the circuit breaker to be set, and recalculating the over-current protection fixed value of the circuit breaker to be set; wherein M is a preset positive integer value.
7. The relay protection constant value setting method for the active power distribution network according to claim 6, wherein performing sensitivity verification on the quick-break protection constant value and the overcurrent protection constant value includes:
acquiring q latest two-phase short-circuit fault recording files of a circuit breaker to be set and an associated feeder line;
determining a check value according to q latest two-phase short-circuit fault recording files;
according to Kk＝Iv/IkCalculating the sensitivity of a quick-break protection fixed value, and if the sensitivity of the quick-break protection fixed value is smaller than a first preset threshold value, judging that the quick-break protection fixed value does not meet the preset sensitivity requirement; wherein, KkConstant sensitivity for quick-break protection, IvTo check the value, IkSetting a protection constant value for quick disconnection;
according to Kl＝Iv/IlCalculating the sensitivity of an overcurrent protection fixed value, and if the sensitivity of the overcurrent protection fixed value is smaller than a second preset threshold value, judging that the overcurrent protection fixed value does not meet the preset sensitivity requirement; wherein, KlSensitivity of constant value for overcurrent protection, IvTo check the value, IlAnd the value is fixed for overcurrent protection.
8. The utility model provides a relay protection constant value setting device of active power distribution network which characterized in that includes:
the circuit breaker setting device comprises a first processing module, a second processing module and a third processing module, wherein the first processing module is used for acquiring n latest three-phase short-circuit fault recording files of a feeder line associated with a circuit breaker to be set, determining a maximum short-circuit current value and a first weight value corresponding to each three-phase short-circuit fault recording file, and determining a quick-break protection fixed value of the circuit breaker to be set based on the maximum short-circuit current value and the first weight value;
the second processing module is used for acquiring m latest non-fault recording files of the feeder line associated with the circuit breaker to be set, determining a maximum non-fault current value and a second weight value corresponding to each non-fault recording file, and determining an overcurrent protection constant value of the circuit breaker to be set based on the maximum non-fault current value and the second weight value;
the setting module is used for setting a relay protection constant value of the circuit breaker to be set based on the quick-break protection constant value and the overcurrent protection constant value; wherein n and m are preset positive integer values.
9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the steps of the method according to any of claims 1 to 7 are implemented when the computer program is executed by the processor.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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