CN114389241B - 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 PDFInfo
- Publication number
- CN114389241B CN114389241B CN202111518130.0A CN202111518130A CN114389241B CN 114389241 B CN114389241 B CN 114389241B CN 202111518130 A CN202111518130 A CN 202111518130A CN 114389241 B CN114389241 B CN 114389241B
- Authority
- CN
- China
- Prior art keywords
- value
- fixed value
- circuit
- setting
- protection fixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Abstract
The invention is applicable to the technical field of power and provides a relay protection setting value setting method and device of an active power distribution network, wherein the method comprises the following steps: acquiring n latest three-phase short-circuit fault wave recording files of a circuit breaker associated feeder line to be set, determining a short-circuit current maximum value and a first weight value corresponding to each three-phase short-circuit fault wave recording file, and determining a quick-break protection fixed value based on the short-circuit current maximum value and the first weight value; obtaining m latest non-fault wave recording files of a circuit breaker associated feeder line to be set, determining a non-fault current maximum value and a second weight value corresponding to each non-fault wave recording file, and determining an overcurrent protection fixed value based on the non-fault current maximum value and the second weight value; and 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. The method and the device can accurately set the relay protection fixed value of the power distribution network.
Description
Technical Field
The invention belongs to the technical field of power, and particularly relates to a relay protection setting value setting method and device for an active power distribution network.
Background
The distribution network consists of a feeder line, and a plurality of circuit breakers are distributed on the feeder line. During the process of transmitting electric energy, various faults, such as three-phase short circuits, two-phase short circuits and the like, may occur in the power distribution network, and the faults often cause damage to equipment or feeder lines, so that great property loss is caused. In order to avoid equipment damage caused by feeder line faults, people install some wave recorders on 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, for the relay protection fixed value of the power distribution network, manual setting is usually performed by relying on experience of engineers, and the accuracy of the relay protection fixed value is poor. And, as a large amount of new energy is accessed into the power system, the structure of the power distribution network presents diversity and complexity, and the setting of relay protection fixed values is more difficult.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a method and a device for setting relay protection setting values of an active power distribution network, which are used for solving the problem that the relay protection setting values are 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 of 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 wave recording files of a circuit breaker associated with a feeder line to be set, determining a short-circuit current maximum value and a first weight value corresponding to each three-phase short-circuit fault wave recording file, and determining a quick-break protection fixed value of the circuit breaker to be set based on the short-circuit current maximum value and the first weight value;
obtaining m latest non-fault wave recording files of a circuit breaker associated feeder line to be set, determining a non-fault current maximum value and a second weight value corresponding to each non-fault wave 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;
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 both preset positive integer values.
Optionally, determining a first weight value corresponding to each three-phase short-circuit fault record file includes:
obtaining the distance between a fault point corresponding to the three-phase short-circuit fault wave recording file and a wave recorder generating the three-phase short-circuit fault wave recording file, the length of a feeder line associated with the circuit breaker to be set, and determining a position coefficient corresponding to the three-phase short-circuit fault wave recording file according to the proportion of the distance to the length;
acquiring the generation time of the three-phase short-circuit fault record file, calculating the time difference between the generation time and the time to be set, and according to the time differenceDetermining a time coefficient corresponding to the three-phase short-circuit fault wave recording file; wherein F (Δt) k ) As time coefficient, Δt k For the time difference->
According to G k ＝αD k +βF(Δt k ) Determining a first weight value corresponding to the three-phase short-circuit fault wave recording file; wherein G is k For the first weight value, D k As a position coefficient, α+β=1.
Optionally, the formula for determining the quick-break protection fixed value of the circuit breaker to be set is as follows:
wherein I is k For the purpose of quick-break protection, a fixed value is set,the first weight value corresponding to the ith three-phase short-circuit fault wave recording file,and the maximum value of the short-circuit current corresponding to the ith three-phase short-circuit fault record file.
Optionally, determining the second weight value corresponding to each non-fault record file includes:
acquiring the generation time of the non-fault record 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 record file according to the following formula
Wherein T (Δt) l ) As the second weight value, Δt l A is the time difference, a>Δt l +1。
Optionally, the formula for determining the overcurrent protection setpoint of the circuit breaker to be set is
Wherein I is l In order to set the value for the over-current protection,for the second weight value corresponding to the ith non-fault record file,/for the second weight value>And the maximum value of the non-fault current corresponding to the i-th non-fault record file.
Optionally, after obtaining the quick-break protection fixed value and the overcurrent protection fixed value, the method further includes:
performing sensitivity verification on the quick-break protection fixed value and the overcurrent protection fixed value;
if the checking 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 wave 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 checking result shows that the overcurrent protection fixed value does not meet the preset sensitivity requirement, m+M latest non-fault wave recording files of the feeder line associated with the circuit breaker to be set are obtained, and the overcurrent protection fixed value of the circuit breaker to be set is recalculated; wherein M is a preset positive integer value.
Optionally, performing sensitivity verification on the quick-break protection fixed value and the overcurrent protection fixed value includes:
acquiring q latest two-phase short-circuit fault wave recording files of a circuit breaker associated feeder line to be set;
determining a check value according to q latest two-phase short-circuit fault wave recording files;
according to K k ＝I v /I k Calculating the sensitivity of the 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 K is k For quick break protection of the constant sensitivity, I v To check value, I k Setting a value for quick-break protection;
according to K l ＝I v /I l Calculating the sensitivity of the 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 K is l For overcurrent protection constant value sensitivity, I v To check value, I l And setting a value for overcurrent protection.
A second aspect of an embodiment of the present invention provides a relay protection setting value setting device for an active power distribution network, including:
the first processing module is used for acquiring n latest three-phase short-circuit fault wave recording files of the associated feeder line of the circuit breaker to be set, determining a short-circuit current maximum value and a first weight value corresponding to each three-phase short-circuit fault wave recording file, and determining a quick-break protection fixed value of the circuit breaker to be set based on the short-circuit current maximum value and the first weight value;
the second processing module is used for acquiring m latest non-fault wave recording files of the circuit breaker associated feeder line to be set, determining a non-fault current maximum value and a second weight value corresponding to each non-fault wave 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;
the setting module is used for setting the relay protection fixed value of the circuit breaker to be set based on the quick-break protection fixed value and the overcurrent protection fixed value; wherein n and m are both 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 setting value setting method of the active power distribution network as described above when the processor executes the computer program.
A fourth aspect of the embodiments of the present invention provides a computer readable storage medium storing a computer program, which when executed by a processor, implements the steps of a relay protection setting value setting method for an active power distribution network as described above.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the embodiment of the invention does not depend on the traditional setting principle, but analyzes the latest n three-phase short-circuit fault wave-recording files of the feeder to obtain the quick-break protection fixed value, analyzes the latest m non-fault wave-recording files of the feeder to obtain the overcurrent protection fixed value, and then sets the relay protection fixed value of the power distribution network based on the quick-break protection fixed value and the overcurrent protection fixed value. Compared with a mode of setting relay protection fixed values according to manual experience, the method can dynamically set in real time according to the wave recording file, and accuracy of the relay protection fixed values is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a power distribution network according to an embodiment of the present invention;
fig. 2 is a schematic implementation flow diagram of a relay protection setting value setting method of an active power distribution network according to an embodiment of the present invention;
fig. 3 is a schematic implementation flow diagram of a relay protection setting value setting method of an active power distribution network according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a relay protection setting 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 the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present 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 illustrate the technical scheme of the invention, the following description is made by specific examples.
The traditional distribution network mainly comprises a single power source and a radial structure, and the distribution network has the advantages of simple structure, small investment and convenient maintenance. The original structural characteristics of the power distribution network are changed after the large-scale distributed power supply is connected into the power distribution network, the distribution of short-circuit current of the power distribution network and the cooperation between relay protection are influenced, the sensitivity and the selectivity of relay protection are reduced, and if the existing protection and the configuration and the fixed value of an automatic device cannot adapt to the change, incorrect actions of the relay protection device can be caused, and accidents are enlarged or equipment is damaged.
At present, the relay protection fixed value setting of a power distribution network is in a stage of mainly qualitative analysis and secondarily of empirically analyzing, the automatic level of fault on-line monitoring and fixed value management is relatively lagged, a novel power system mainly taking new energy sources is built on a large scale, the distribution network line structure and distribution and utilization load distribution show diversity and complexity, the influence of different positions, different numbers and different capacity distributed power sources on the fixed value is considered in the fixed value setting calculation of the power distribution network, the calculation process becomes abnormal and complicated, and even the condition of incapability of setting occurs. Although relay protection fixed value automatic setting system used in individual areas can replace manual calculation, the problem that the fixed value is difficult due to the fact that a distribution network structure is changeable due to large-scale distributed power supply access is not solved.
The embodiment of the invention provides a relay protection fixed value setting method of an active power distribution network, wherein the relay protection fixed value comprises a quick-break protection fixed value and an overcurrent protection fixed value.
Referring to fig. 1, the relay protection setting value setting method of the active power distribution network includes:
step S101, acquiring n latest three-phase short-circuit fault wave recording files of a circuit breaker associated feeder line to be set, determining a short-circuit current maximum value and a first weight value corresponding to each three-phase short-circuit fault wave recording file, and determining a quick-break protection fixed value of the circuit breaker to be set based on the short-circuit current maximum value and the first weight value.
Step S102, obtaining m latest non-fault wave recording files of a circuit breaker associated feeder line to be set, determining a non-fault current maximum value and a second weight value corresponding to each non-fault wave 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.
Step S103, 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 both preset positive integer values.
In the embodiment of the invention, the structure of the power distribution network is first described.
Referring to fig. 2, the distribution network is formed by a feeder line, where two ends of the feeder line typically have a breaker K, and a middle portion of the feeder line may also have a plurality of breakers. In order to realize safe operation of the power distribution network, various parameters of the power distribution network need to be recorded, so that a wave recorder is arranged on the feeder line and used for recording various parameters of the feeder line during faults, such as current, voltage, the time length of opening a circuit breaker after the faults occur, and the like. The circuit breaker associated with the feeder is typically the circuit breaker at the head end of the feeder, which opens to form protection when the feeder fails. Therefore, the embodiment can determine the quick-break protection fixed value and the overcurrent protection fixed value of the circuit breaker to be set by analyzing the wave recording file recorded by the wave recorder on the feeder.
The wave recorder only records waves when the feeder line has faults such as three-phase short circuit and two-phase short circuit, and the non-fault wave recording file refers to a wave recording file with the wave recording function started by the wave recorder caused by current change of the feeder line but without the feeder line fault. After the three-phase short-circuit fault wave recording file and the non-fault wave recording file associated with the feeder line are acquired, whether the wave recording file is an intra-area fault file or not can be judged.
The method for judging whether the wave recording file is an intra-zone fault file comprises the following steps:
if the wave recording file is only related to the power supply side breaker, the wave recording file is an in-zone fault file.
If the wave recording file is related to the power supply side breaker and the load side breaker, the wave recording file is an out-of-zone fault file and cannot be used, and needs to be reselected.
It can be understood that if a certain wave recording file is associated with the power-supply-side circuit breaker and the load-side circuit breaker of the feeder, the wave recording file may be generated by the next section of feeder internal fault and is an out-of-area fault file.
Optionally, in step S101, the determining a first weight value corresponding to each three-phase short-circuit fault record file may be described in detail as:
obtaining the distance between a fault point corresponding to the three-phase short-circuit fault wave recording file and a wave recorder generating the three-phase short-circuit fault wave recording file, the length of a feeder line associated with the circuit breaker to be set, and determining a position coefficient corresponding to the three-phase short-circuit fault wave recording file according to the proportion of the distance to the length;
acquiring the generation time of the three-phase short-circuit fault record file, calculating the time difference between the generation time and the time to be set, and according to the time differenceDetermining a time coefficient corresponding to the three-phase short-circuit fault wave recording file; wherein F (Δt) k ) As time coefficient, Δt k For the time difference->
According to G k ＝αD k +βF(Δt k ) Determining a first weight value corresponding to the three-phase short-circuit fault wave recording file; wherein G is k For the first weight value, D k As a position coefficient, α+β=1.
Optionally, in step S101, the formula for determining the quick-break protection fixed value of the circuit breaker to be set is:
wherein I is k For the purpose of quick-break protection, a fixed value is set,the first weight value corresponding to the ith three-phase short-circuit fault wave recording file,and the maximum value of the short-circuit current corresponding to the ith three-phase short-circuit fault record file.
In the embodiment of the invention, the quick-break protection adopts the mode of improving the setting value to realize the instantaneous action, the action is considered according to the short-circuit current under the mode of avoiding the maximum operation, the maximum operation mode refers to a mode of generating the maximum short-circuit current after the system has the minimum short-circuit impedance value and the three-phase short-circuit current is the maximum in all faults, so that the three-phase short-circuit fault wave recording file is used for calculating the quick-break protection setting value.
Specifically, by analyzing the transverse factors and the longitudinal factors of each three-phase short-circuit fault wave recording file, the weight value of each three-phase short-circuit fault wave recording file is comprehensively determined, and the quick-break protection fixed value is determined according to the weight value and the short-circuit current maximum value of each three-phase short-circuit fault wave recording file. The longitudinal factor is a position coefficient, namely the distance between the fault point corresponding to the three-phase short-circuit fault wave recording file and the wave recorder generating the three-phase short-circuit fault wave recording file, the ratio of the fault point to the wave recorder generating the three-phase short-circuit fault wave recording file to the length of the relevant feeder line of the circuit breaker to be set,the larger the proportion is, the more stable the parameter recorded by the recorder is, and the more important the three-phase short-circuit fault recording file is. The transverse factor is a time coefficient, and according to the calculation of the generation time of the three-phase short-circuit fault wave recording file, the reference value of the three-phase short-circuit fault wave recording file with the later generation time is larger, because the exponential function of the time coefficient always passes the point (0, 1), namely if deltat k If the value is 0, the recorded file is the recorded file most needed at the setting time, which is most expected to be seen, and then F (delta t k ) The time coefficient is limited to be between 0.5 and 1, namely, the time coefficient cannot be smaller 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 protection device acts more reliably. And finally, determining the weight value of each three-phase short-circuit fault record file based on the position coefficient and the time coefficient, and determining the quick-break protection fixed value by carrying out weighted average on the maximum short-circuit current of each three-phase short-circuit fault record file based on the weight value.
Optionally, in step S102, the determining the second weight value corresponding to each non-fault record file may be described in detail as:
acquiring the generation time of the non-fault record 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 record file according to the following formula
Wherein T (Δt) l ) As the second weight value, Δt l A is the time difference, a>Δt l +1。
Optionally, in step S102, the formula for determining the overcurrent protection constant value of the circuit breaker to be set is
Wherein I is l In order to set the value for the over-current protection,for the second weight value corresponding to the ith non-fault record file,/for the second weight value>And the maximum value of the non-fault current corresponding to the i-th non-fault record file.
In the embodiment of the invention, the overcurrent protection is set according to the current which avoids the maximum load of the system, under normal load, the wave recording device is not started and is not used for recording the wave file, and the current which is used for starting the wave recording device exceeds a certain limit value, so that the maximum load current adopts the wave recording file which is just started by the wave recording device and is not failed, namely the non-failure wave recording file.
Specifically, the weight value of the non-fault record file is calculated through the generation time, and the maximum non-fault current of each non-fault record 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:
performing sensitivity verification on the quick-break protection fixed value and the overcurrent protection fixed value;
if the checking 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 wave 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 checking result shows that the overcurrent protection fixed value does not meet the preset sensitivity requirement, m+M latest three-phase short-circuit fault wave recording files of the feeder line associated with the circuit breaker to be set are obtained, and the overcurrent protection fixed value of the circuit breaker to be set is recalculated; wherein M is a preset positive integer value.
In the embodiment of the invention, for example, N and N can be set to 3, that is, the latest 3 three-phase short-circuit fault record files are selected to calculate the quick-break protection fixed value, when the quick-break protection fixed value does not meet the preset sensitivity requirement, 6 three-phase short-circuit fault record files can be selected to calculate the quick-break protection fixed value, and so on until the quick-break protection fixed value meets the sensitivity requirement. The verification process of the overcurrent protection constant value is similar to the above.
Optionally, performing sensitivity verification on the quick-break protection fixed value and the overcurrent protection fixed value includes:
acquiring q latest two-phase short-circuit fault wave recording files of a circuit breaker associated feeder line to be set;
determining a check value according to q latest two-phase short-circuit fault wave recording files;
according to K k ＝I v /I k Calculating the sensitivity of the 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 K is k For quick break protection of the constant sensitivity, I v To check value, I k Setting a value for quick-break protection;
according to K l ＝I v /I l Calculating the sensitivity of the 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 K is l For overcurrent protection constant value sensitivity, I v To check value, I l And setting a value for overcurrent protection.
In the embodiment of the invention, under the operation mode that the sensitivity is the minimum, the fixed value set by the protection device can also enable the protection device to act, and when two phases are short-circuited, the short-circuit current is the minimum, so that the sensitivity verification uses a two-phase short-circuit wave recording file. Specifically, q latest two-phase short-circuit fault wave-recording files are selected, the weight of each two-phase short-circuit fault wave-recording file is calculated, and the calculation method is the same as the weight calculation method of the three-phase short-circuit fault wave-recording files, namely, the position coefficient and the time coefficient are calculated according to the following formula:
wherein D is v As the coefficient of the position of the object,x v s is the distance between the fault point corresponding to the two-phase short-circuit fault record file and the recorder generating the two-phase short-circuit fault record file v To correlate the length of the feed line, F (Δt v ) As time coefficient, Δt v And the time difference between the generation time and the to-be-set time of the two-phase short circuit fault record file is obtained.
The weights are determined according to the following equation:
G v ＝χD k +δF(Δt v )
wherein G is v As weights, χ+δ=1.
And carrying out weighted average on the maximum short-circuit current of each two-phase short-circuit fault record file to obtain a check value:
wherein I is v In order to check the value of the value,the weight value corresponding to the ith two-phase short-circuit fault record file is +.>And the maximum value of the short-circuit current corresponding to the i-th two-phase short-circuit fault record file.
In the embodiment of the invention, both the first preset threshold and the second preset threshold can be set to be 1.5, i.e. when the sensitivity of the quick-break protection fixed value or the sensitivity of the overcurrent protection fixed value is smaller than 1.5, the sensitivity requirement is not met.
Based on the above, referring to fig. 3, the overall flow of the embodiment of the present invention is as follows:
(1) Determining a breaker to be set;
(2) Selecting a related wave recording file, judging whether the file is an intra-area fault file, and re-selecting the related wave recording file if the wave recording file is an extra-area fault file;
(3) Determining a short-circuit current maximum value and a first weight value based on the three-phase short-circuit fault wave recording file, and determining a quick-break protection fixed value of the circuit breaker to be set based on the short-circuit current maximum value and the first weight value;
(4) Determining a non-fault current maximum value and a second weight value based on the non-fault wave 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;
(5) Determining a check value based on the two-phase short circuit fault record file;
(6) Checking the quick-break protection fixed value and the overcurrent protection fixed value, judging whether the quick-break protection fixed value and the overcurrent protection fixed value meet the sensitivity requirement, and if so, setting the relay protection fixed value of the circuit breaker to be set; if not, re-selecting the recorded file to calculate the quick-break protection fixed value or the overcurrent protection fixed value.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment 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 an active power distribution network includes:
the first processing module 41 is configured to obtain n latest three-phase short-circuit fault record files of the relevant feeder lines of the circuit breaker to be set, determine a maximum value of short-circuit current and a first weight value corresponding to each three-phase short-circuit fault record file, and determine a quick-break protection fixed value of the circuit breaker to be set based on the maximum value of short-circuit current and the first weight value.
The second processing module 42 is configured to obtain m latest non-fault record files of the circuit breaker associated with the feeder line to be set, determine a non-fault current maximum value and a second weight value corresponding to each non-fault record file, and determine 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.
The setting module 43 is configured to set a relay protection setting value for the circuit breaker to be set based on the quick-break protection setting value and the overcurrent protection setting value; wherein n and m are both preset positive integer values.
Optionally, the first processing module 41 is specifically configured to,
obtaining the distance between a fault point corresponding to the three-phase short-circuit fault wave recording file and a wave recorder generating the three-phase short-circuit fault wave recording file, the length of a feeder line associated with the circuit breaker to be set, and determining a position coefficient corresponding to the three-phase short-circuit fault wave recording file according to the proportion of the distance to the length;
acquiring the generation time of the three-phase short-circuit fault record file, calculating the time difference between the generation time and the time to be set, and according to the time differenceDetermining a time coefficient corresponding to the three-phase short-circuit fault wave recording file; wherein F (Δt) k ) As time coefficient, Δt k For the time difference->
According to G k ＝αD k +βF(Δt k ) Determining a first weight value corresponding to the three-phase short-circuit fault wave recording file; wherein G is k For the first weight value, D k As a position coefficient, α+β=1.
Optionally, the formula for determining the quick-break protection fixed value of the circuit breaker to be set is as follows:
wherein I is k For the purpose of quick-break protection, a fixed value is set,the first weight value corresponding to the ith three-phase short-circuit fault wave recording file,and the maximum value of the short-circuit current corresponding to the ith three-phase short-circuit fault record file.
Optionally, the second processing module 42 is specifically configured to:
acquiring the generation time of the non-fault record 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 record file according to the following formula
Wherein T (Δt) l ) As the second weight value, Δt l A is the time difference, a>Δt l +1。
Optionally, the formula for determining the overcurrent protection setpoint of the circuit breaker to be set is
Wherein I is l In order to set the value for the over-current protection,for the second weight value corresponding to the ith non-fault record file,/for the second weight value>And the maximum value of the non-fault current corresponding to the i-th non-fault record file.
Optionally, after obtaining the quick-break protection fixed value, the first processing module 41 is further configured to:
performing sensitivity verification on the quick-break protection fixed value;
if the checking 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 wave 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.
Optionally, after obtaining the overcurrent protection constant value, the second processing module 42 is further configured to:
performing sensitivity verification on the overcurrent protection fixed value;
if the checking result shows that the overcurrent protection fixed value does not meet the preset sensitivity requirement, m+M latest non-fault wave recording files of the feeder line associated with the circuit breaker to be set are obtained, and the overcurrent protection fixed value of the circuit breaker to be set is recalculated; wherein M is a preset positive integer value.
Optionally, performing sensitivity verification on the quick-break protection fixed value and the overcurrent protection fixed value includes:
acquiring q latest two-phase short-circuit fault wave recording files of a circuit breaker associated feeder line to be set;
determining a check value according to q latest two-phase short-circuit fault wave recording files;
according to K k ＝I v /I k Calculating the sensitivity of the 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 K is k For quick break protection of the constant sensitivity, I v To check value, I k Setting a value for quick-break protection;
according to K l ＝I v /I l Calculating the sensitivity of the 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 K is l For overcurrent protection constant value sensitivity, I v To check value, I l Constant value for overcurrent 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 device 50 of this embodiment includes: a processor 51, a memory 52 and a computer program 53, such as a relay protection setting program, stored in the memory 52 and executable on the processor 51. The steps in the embodiment of the method for setting relay protection setting values of active power distribution networks described above, such as steps S101 to S103 shown in fig. 1, are implemented when the processor 51 executes the computer program 53. Alternatively, the processor 51, when executing the computer program 53, implements the functions of the modules in the above-described device embodiments, such as the functions of the modules 41 to 43 shown in fig. 4.
By way of example, 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 complete the present invention. One or more of the modules/units may be a series of computer program instruction segments capable of performing particular functions for describing the execution of the computer program 53 in the electronic device 50. For example, the computer program 53 may be divided into a first processing module 41, a second processing module 42, and a setting module 43 (a module in the virtual device), each of which specifically functions as follows:
the first processing module 41 is configured to obtain n latest three-phase short-circuit fault record files of the relevant feeder lines of the circuit breaker to be set, determine a maximum value of short-circuit current and a first weight value corresponding to each three-phase short-circuit fault record file, and determine a quick-break protection fixed value of the circuit breaker to be set based on the maximum value of short-circuit current and the first weight value.
The second processing module 42 is configured to obtain m latest non-fault record files of the circuit breaker associated with the feeder line to be set, determine a non-fault current maximum value and a second weight value corresponding to each non-fault record file, and determine 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.
The setting module 43 is configured to set a relay protection setting value for the circuit breaker to be set based on the quick-break protection setting value and the overcurrent protection setting value; wherein n and m are both preset positive integer values.
The electronic device 50 may be a desktop computer, a notebook computer, a palm computer, a cloud server, or the like. The electronic device 50 may include, but is not limited to, a processor 51, a memory 52. It will be appreciated by those skilled in the art that fig. 5 is merely an example of electronic device 50 and is not intended to limit electronic device 50, and may include more or fewer components than shown, or may 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 (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 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) or the like, which are provided on the electronic device 50. Further, the memory 52 may also include both internal and external storage units of the electronic device 50. The memory 52 is used to store 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-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a 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 process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
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 solution. 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 manners. For example, the apparatus/electronic device embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, and the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the content of the computer readable medium can be appropriately increased or decreased according to the requirements of the jurisdiction's jurisdiction and the patent practice, for example, in some jurisdictions, the computer readable medium does not include electrical carrier signals and telecommunication signals according to the jurisdiction and the patent practice.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (10)
1. The relay protection fixed value setting method for the active power distribution network is characterized in that 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 wave recording files of a circuit breaker associated with a feeder line to be set, determining a short-circuit current maximum value and a first weight value corresponding to each three-phase short-circuit fault wave recording file, and determining a quick-break protection fixed value of the circuit breaker to be set based on the short-circuit current maximum value and the first weight value;
acquiring m latest non-fault wave recording files of the circuit breaker associated feeder line to be set, determining a non-fault current maximum value and a second weight value corresponding to each non-fault wave 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;
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 both preset positive integer values.
2. The method for setting relay protection setting values of an active power distribution network according to claim 1, wherein determining a first weight value corresponding to each three-phase short-circuit fault record file comprises:
obtaining the distance between a fault point corresponding to the three-phase short-circuit fault wave recording file and a wave recorder generating the three-phase short-circuit fault wave recording file, 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 wave recording file according to the proportion of the distance to the length;
acquiring the generation time of the three-phase short-circuit fault record file, calculating the time difference between the generation time and the time to be set, and according to the time differenceDetermining a time coefficient corresponding to the three-phase short-circuit fault wave recording file; wherein F (Δt) k ) As time coefficient, Δt k For the time difference->
According to G k ＝αD k +βF(Δt k ) Determining a first weight value corresponding to the three-phase short-circuit fault wave recording file; wherein G is k For the first weight value, D k As a position coefficient, α+β=1.
3. The method for setting relay protection setting values of an active power distribution network according to claim 2, wherein the formula for determining the quick-break protection setting value of the circuit breaker to be set is:
wherein I is k For the purpose of quick-break protection, a fixed value is set,the first weight value corresponding to the ith three-phase short-circuit fault record file is +.>And the maximum value of the short-circuit current corresponding to the ith three-phase short-circuit fault record file.
4. The method for setting relay protection setting values of an active power distribution network according to claim 1, wherein determining the second weight value corresponding to each non-fault record file comprises:
acquiring the generation time of the non-fault record 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 record file according to the following formula
Wherein T (Δt) l ) As the second weight value, Δt l A is the time difference, a>Δt l +1。
5. The method for setting relay protection setting values of an active power distribution network according to claim 4, wherein the formula for determining the overcurrent protection setting value of the circuit breaker to be set is as follows
Wherein I is l In order to set the value for the over-current protection,for the second weight value corresponding to the ith non-fault record file,/for the second weight value>And the maximum value of the non-fault current corresponding to the i-th non-fault record file.
6. The relay protection setting value setting method of an active power distribution network according to claim 1, further comprising, after obtaining the quick-break protection setting value and the overcurrent protection setting value:
performing sensitivity verification on the quick break protection fixed value and the overcurrent protection fixed value;
if the checking 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 wave 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 verification result shows that the overcurrent protection fixed value does not meet the preset sensitivity requirement, m+M latest non-fault wave recording files of the feeder line associated with the circuit breaker to be set are obtained, and the overcurrent protection fixed value of the circuit breaker to be set is recalculated; wherein M is a preset positive integer value.
7. The method for setting a relay protection setting value of an active power distribution network according to claim 6, wherein performing sensitivity verification on the quick-break protection setting value and the overcurrent protection setting value comprises:
acquiring q latest two-phase short-circuit fault wave recording files of a circuit breaker associated feeder line to be set;
determining a check value according to q latest two-phase short-circuit fault wave recording files;
according to K k ＝I v /I k Calculating the sensitivity of the 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 K is k For quick break protection of the constant sensitivity, I v To check value, I k Setting a value for quick-break protection;
according to K l ＝I v /I l Calculating the sensitivity of the 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 K is l For overcurrent protection constant value sensitivity, I v To check value, I l And setting a value for overcurrent protection.
8. The utility model provides a relay protection setting value setting device of active distribution network which characterized in that includes:
the first processing module is used for acquiring n latest three-phase short-circuit fault wave recording files of the associated feeder line of the circuit breaker to be set, determining a short-circuit current maximum value and a first weight value corresponding to each three-phase short-circuit fault wave recording file, and determining a quick-break protection fixed value of the circuit breaker to be set based on the short-circuit current maximum value and the first weight value;
the second processing module is used for acquiring m latest non-fault wave recording files of the circuit breaker associated feeder line to be set, determining a non-fault current maximum value and a second weight value corresponding to each non-fault wave 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;
the setting module is used for setting the relay protection fixed value of the circuit breaker to be set based on the quick-break protection fixed value and the overcurrent protection fixed value; wherein n and m are both 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 processor implements the steps of the method according to any one of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111518130.0A CN114389241B (en) | 2021-12-13 | 2021-12-13 | Relay protection setting value setting method and device for active power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111518130.0A CN114389241B (en) | 2021-12-13 | 2021-12-13 | Relay protection setting value setting method and device for active power distribution network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114389241A CN114389241A (en) | 2022-04-22 |
| CN114389241B true CN114389241B (en) | 2023-07-25 |
Family
ID=81195816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111518130.0A Active CN114389241B (en) | 2021-12-13 | 2021-12-13 | Relay protection setting value setting method and device for active power distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114389241B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116148657B (en) * | 2023-04-21 | 2023-07-07 | 浙江威利坚科技股份有限公司 | Electromagnetic leakage circuit breaker operation monitoring and diagnosing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101441242A (en) * | 2008-12-23 | 2009-05-27 | 南京钢铁联合有限公司 | Method for detecting failure current cutting-off time when electric power system out of order |
| CN102593865A (en) * | 2012-02-23 | 2012-07-18 | 中国电力科学研究院 | Dynamic simulation system and simulation method for accessing wind power into power grids |
| CN107370114A (en) * | 2017-08-14 | 2017-11-21 | 深圳市中业智能系统控制有限公司 | The setting method and device of current quick definite value |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10236675B2 (en) * | 2016-07-26 | 2019-03-19 | Schweitzer Engineering Laboratories, Inc. | Fault detection and protection during steady state using traveling waves |
-
2021
- 2021-12-13 CN CN202111518130.0A patent/CN114389241B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101441242A (en) * | 2008-12-23 | 2009-05-27 | 南京钢铁联合有限公司 | Method for detecting failure current cutting-off time when electric power system out of order |
| CN102593865A (en) * | 2012-02-23 | 2012-07-18 | 中国电力科学研究院 | Dynamic simulation system and simulation method for accessing wind power into power grids |
| CN107370114A (en) * | 2017-08-14 | 2017-11-21 | 深圳市中业智能系统控制有限公司 | The setting method and device of current quick definite value |
Non-Patent Citations (1)
| Title |
|---|
| 矿区35kV电网线路继电保护的现状及改进措施;张兆华;;工矿自动化(第09期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114389241A (en) | 2022-04-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109450089B (en) | Transformer area low voltage identification method and device and terminal equipment | |
| CN110646733A (en) | Method and system for testing low voltage ride through characteristics of wind turbine generator and storage medium | |
| CN114389241B (en) | Relay protection setting value setting method and device for active power distribution network | |
| US11477213B2 (en) | Technologies for providing secure emergency power control of high voltage direct current transmission system | |
| CN109587145B (en) | False data intrusion detection method, device and equipment in power network | |
| CN113285471B (en) | Offshore wind farm subsynchronous oscillation source sensing and positioning method, device and equipment | |
| CN108009063A (en) | The method of a kind of electronic equipment fault threshold detection | |
| CN117155757A (en) | Power information communication fault early warning analysis method based on big data technology | |
| CN114300763B (en) | Battery internal resistance abnormality monitoring method, device and storage medium based on vehicle cloud coordination | |
| CN113922343B (en) | Power distribution network protection fixed value setting method, terminal equipment and storage medium | |
| CN113033889B (en) | High-voltage transmission line fault prediction method and device and terminal equipment | |
| CN110672938A (en) | Method and system for testing low voltage ride through characteristics of photovoltaic inverter and storage medium | |
| CN115545479A (en) | Method and device for determining important nodes or important lines of power distribution network | |
| CN113242018B (en) | Photovoltaic equipment fault diagnosis method and application device thereof | |
| CN115579845A (en) | Relay protection fixed value analysis and verification method based on big data analysis | |
| CN114252764A (en) | Method, device, equipment and medium for checking current breaking capacity of circuit breaker | |
| CN114139744A (en) | Abnormal photovoltaic group string branch identification method and device, electronic equipment and storage medium | |
| CN114034973A (en) | Fault area identification method, device and system for distribution line ground fault | |
| CN109638845B (en) | Method and device for establishing switching combination scheme of power transmission line | |
| CN109375055B (en) | Detection method, system and device of phasor measurement system and storage medium | |
| CN114123164B (en) | Method and device for calculating short-circuit capacity of power system and terminal equipment | |
| CN111865700A (en) | Information node screening method and related device for electric power information physical system | |
| CN114268076B (en) | Zero sequence current protection method, system, electronic equipment and storage medium | |
| CN111929535B (en) | Method and device for detecting fault direction of direct-current side outlet of alternating-current circuit | |
| CN116995627B (en) | Protection device optimization method and system for county distributed photovoltaic distribution network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |