CN115173374B - Relay protection method, device, medium and equipment for traction power supply system - Google Patents
Relay protection method, device, medium and equipment for traction power supply system Download PDFInfo
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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
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- 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
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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
- H02H7/28—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 for meshed systems
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Abstract
The disclosure relates to a traction power supply system relay protection method, a device, a medium and equipment, wherein the method comprises the following steps: acquiring historical statistic values of the locomotive load of the line, wherein the historical statistic values are obtained based on historical monitoring values at a plurality of different moments in the historical driving process; determining a relay protection fixed value of the current increment based on the historical statistic value; adjusting the relay protection setting value of the current increment based on the relay protection setting value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value. Therefore, the relay protection fixed value of the current increment can be determined by combining the historical statistical value of the locomotive load of the circuit, and then the relay protection set value of the current increment is adjusted, so that the adjusted relay protection set value is larger than the relay protection fixed value, the relay protection is realized, the magnitude of the relay protection set value can be flexibly adjusted based on the historical statistical condition, the relay protection requirement is met, misoperation of the relay protection is avoided, the accuracy is improved, and the safety of power supply and driving is improved.
Description
Technical Field
The disclosure relates to the technical field of traction power supply, in particular to a relay protection method, a relay protection device, a relay protection medium and relay protection equipment for a traction power supply system.
Background
With the development of traction power supply technology, the electrified railway transportation strategy trunk line gradually extends, the train transportation order is continuously adjusted, and overload tripping occurs.
For example, with the gradual enrichment and the development of complexity of a trunk network, projects in a plurality of different areas are implemented successively, rated current of an operating locomotive is larger and larger, a current setting value corresponding to a current increment protection action is correspondingly increased and is even larger than minimum metallic short-circuit current at the tail end of a contact network, so that the current increment protection can lose effect, even a contact network disconnection accident is caused, and power supply and driving safety are affected.
Disclosure of Invention
In order to solve the technical problems described above or at least partially solve the technical problems described above, the present disclosure provides a traction power supply system relay protection method, apparatus, medium and device.
The disclosure provides a relay protection method for a traction power supply system, comprising the following steps:
acquiring historical statistical values of the locomotive load of the line; the historical statistical value is obtained based on statistics of historical monitoring values at a plurality of different moments in the historical driving process;
Determining a relay protection fixed value of the current increment based on the historical statistic value;
adjusting the relay protection setting value of the current increment based on the relay protection setting value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value, and the relay protection setting value is a threshold value arranged in the relay protection device.
Optionally, the obtaining the historical statistic of the locomotive load of the line includes:
and obtaining a traction characteristic curve and a locomotive schedule of the locomotive.
Optionally, the determining the relay protection setting value of the current increment based on the historical statistic includes:
determining a traction maximum value and an acceleration maximum value in a single power frequency period based on the traction characteristic curve;
determining a maximum value of current increment in a single power frequency period based on the maximum value of traction force and the maximum value of acceleration;
determining the maximum starting number of locomotives on a traction power supply line based on the locomotive schedule;
and determining the relay protection fixed value based on the maximum value of the starting quantity of the locomotives and the corresponding maximum value of the current increment of each locomotive in a single power frequency period.
Optionally, the relay protection fixed value is equal to the product of the maximum value of the starting quantity of the locomotive and the maximum value of the current increment in a single power frequency period.
Optionally, the method further comprises:
based on the historical statistical value, determining voltage, current, impedance angle corresponding to current increment protection tripping and distribution state of the locomotive in a traction power supply network;
acquiring a history principle logic of current increment protection;
based on voltage, current, impedance angle and distribution state of locomotive in traction power supply network corresponding to current increment protection tripping, identifying error node of the history principle logic;
correcting the error node.
Optionally, the error node comprises a metering accumulation problem node for second harmonic and current increment values;
the correcting the error node includes:
correcting the logic of the error node as: when the current increment measuring element acts and the second harmonic is greater than the locking setting value, after the second harmonic is locked and returned, the current increment measuring element is cleared, and the measurement is restarted when the second harmonic is lower than the locking setting value.
The present disclosure also provides a traction power supply system relay protection device, comprising:
the first acquisition module is used for acquiring historical statistic values of the line locomotive load; the historical statistical value is obtained based on statistics of historical monitoring values at a plurality of different moments in the historical driving process;
The first determining module is used for determining relay protection fixed values of current increment based on the historical statistic values;
the fixed value adjusting module is used for adjusting the relay protection set value of the current increment based on the relay protection fixed value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value, and the relay protection setting value is a threshold value arranged in the relay protection device.
Optionally, the first obtaining module is configured to obtain a historical statistic value of a load of the line locomotive, and specifically includes:
and obtaining a traction characteristic curve and a locomotive schedule of the locomotive.
Optionally, the first determining module is configured to determine a relay protection constant value of a current increment based on the historical statistics, and specifically includes:
determining a traction maximum value and an acceleration maximum value in a single power frequency period based on the traction characteristic curve;
determining a maximum value of current increment in a single power frequency period based on the maximum value of traction force and the maximum value of acceleration;
determining the maximum starting number of locomotives on a traction power supply line based on the locomotive schedule;
and determining the relay protection fixed value based on the maximum value of the starting quantity of the locomotives and the corresponding maximum value of the current increment of each locomotive in a single power frequency period.
Optionally, the relay protection fixed value is equal to the product of the maximum value of the starting quantity of the locomotive and the maximum value of the current increment in a single power frequency period.
Optionally, the apparatus further comprises:
the second determining module is used for determining voltage, current, impedance angle and distribution state of the locomotive in the traction power supply network corresponding to the current increment protection tripping based on the historical statistical value;
the second acquisition module is used for acquiring the history principle logic of current increment protection;
the node identification module is used for identifying the error node of the history principle logic based on the voltage, the current, the impedance angle and the distribution state of the locomotive in the traction power supply network corresponding to the current increment protection tripping;
and the node correction module is used for correcting the error node.
Optionally, the error node comprises a metering accumulation problem node for second harmonic and current increment values;
the node correction module is configured to correct the error node, and specifically includes:
correcting the logic of the error node as: when the current increment measuring element acts and the second harmonic is greater than the locking setting value, after the second harmonic is locked and returned, the current increment measuring element is cleared, and the measurement is restarted when the second harmonic is lower than the locking setting value.
The present disclosure also provides a computer readable medium storing a computer program for performing the steps of any of the methods described above.
The present disclosure also provides an electronic device including:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the steps of any of the methods described above.
Compared with the prior art, the technical scheme provided by the disclosure has the following advantages:
the relay protection method for the traction power supply system provided by the disclosure comprises the following steps: acquiring historical statistical values of the locomotive load of the line, wherein the historical statistical values are obtained based on statistics of historical monitoring values at a plurality of different moments in the historical driving process; determining a relay protection fixed value of the current increment based on the historical statistic value; adjusting the relay protection setting value of the current increment based on the relay protection setting value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value, and the relay protection setting value is a threshold value arranged in the relay protection device. Therefore, the relay protection fixed value of the current increment can be determined by combining the historical statistical value of the locomotive load of the circuit, and then the relay protection set value of the current increment is adjusted, so that the adjusted relay protection set value is larger than the relay protection fixed value, the relay protection set value in the relay protection device can be flexibly adjusted based on the historical statistical condition while relay protection is realized, the relay protection device is adapted to relay protection requirements, misoperation of relay protection is avoided, accuracy is improved, and safety of power supply and driving is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic flow chart of a relay protection method of a traction power supply system according to an embodiment of the disclosure;
fig. 2 is a schematic diagram of a power frequency 1 cycle current increment characteristic change of a motor train unit according to an embodiment of the disclosure;
fig. 3 is a schematic flow chart of another relay protection method of a traction power supply system according to an embodiment of the disclosure;
fig. 4 is a current change curve of a substation according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a traction substation power supply according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a history principle logic of current delta protection provided by an embodiment of the present disclosure;
Fig. 7 is a schematic structural diagram of a relay protection device of a traction power supply system according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of another relay protection device of a traction power supply system according to an embodiment of the disclosure;
fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
Technical term explanation:
the current increment protection, also called high-resistance ground protection, is provided for the purpose that when the traction network is grounded in a high-resistance way, the current protection and the distance protection can not judge the occurrence of faults and reject the action, so that the current increment protection is introduced, and the action characteristic element always judges the current increment in a short time. When high resistance ground occurs, the current is small compared with the metallic short circuit, but the increment of the short circuit current is still present, so the high resistance ground fault can be judged by utilizing the current increment protection. When the load of the electric locomotive is started, the current increment protection element can also measure the increase of the traction network current, and the current increment protection cannot malfunction because the electric locomotive is equivalent to a large inductor and the current increase rate is slower than the short-circuit fault current increase rate.
For the case where the current increment protection is disabled, such as the case shown in the background, or the following case: along with the extension of the strategic trunk line, the geological condition of the part of the line is complex, the operation environment is bad, and the traction power supply equipment is influenced by factors such as falling off of the upper overline, lodging of the tree bamboo, flood disasters, lightning impulse and the like, so that the overhead contact system is extremely easy to generate high-resistance ground faults, and the power supply and the driving safety are also influenced. The embodiment of the disclosure provides a method for improving a current increment protection function, which is applied to a traction power supply system, such as a high-speed rail traction substation, and solves the problem of poor reliability of current increment protection action when an electrified railway has high-resistance grounding fault. Specifically, the method provided by the embodiment of the disclosure utilizes the related data of the current increment in the running process of the traction power supply system (including the traction substation), determines the relay protection fixed value of the current increment through the steps of statistical calculation and the like, and adjusts the relay protection set value to the relay protection fixed value so as to realize the adjustment of the current increment protection function and improve the reliability; and meanwhile, the historical principle logic of the current increment protection is corrected by utilizing the historical statistical data, which is equivalent to upgrading the software program and/or hardware logic corresponding to the current increment protection, thereby improving the reliability and sensitivity of the current increment protection and ensuring the operation safety of the traction power supply system.
The following describes exemplary embodiments of a traction power supply system relay protection method, device, medium and equipment according to embodiments of the present disclosure with reference to the accompanying drawings.
In some embodiments, fig. 1 is a schematic flow chart of a relay protection method of a traction power supply system according to an embodiment of the disclosure. As shown in fig. 1, the relay protection method of the traction power supply system comprises the following steps:
s110, acquiring historical statistic values of the locomotive load of the line.
Specifically, the line refers to all driving lines corresponding to the traction power supply system, and the locomotive comprises all electric locomotives running on the line corresponding to the traction power supply system. The historical statistic value of the locomotive load of the line is obtained based on historical monitoring values at a plurality of different moments in the historical driving process, which can comprise historical monitoring values in the locomotive operation process, such as current values, voltage values, characteristic curves, scheduling conditions and the like, and can also comprise the result of classification statistics based on the historical monitoring values, or can also comprise the result obtained by simple mathematical operation based on the historical monitoring values, and is not limited herein.
Typically, the historical statistics are stored in a memory for backtracking.
In this step, the historical statistics may be recalled from memory for use in subsequent steps.
And S120, determining a relay protection fixed value of the current increment based on the historical statistic value.
Specifically, data statistics is performed on the basis of historical statistics values, and relay protection constant values of current increment are determined. The relay protection constant value is a constant value which does not generate misoperation, refusal operation and other conditions while realizing current increment protection, and can be a current value, and the specific implementation process of the step is exemplified hereinafter.
S130, adjusting a relay protection set value of the current increment based on the relay protection set value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value.
Specifically, the relay protection set value is a threshold value set in the relay protection device, that is, the relay protection set value of the current increment is an originally set current value corresponding to the current increment protection, and when the value is too small, malfunction may be caused, so that the accuracy of the current increment protection is poor. In the step, the relay protection set value of the current increment is adjusted to be a current value larger than the relay protection set value, misoperation can be avoided, namely, the size of the relay protection set value is flexibly adjusted based on historical statistics, so that the relay protection set value is adapted to relay protection requirements, misoperation of relay protection is avoided, accuracy is improved, and safety of power supply and driving is improved.
For example, the relay protection setting value may be adjusted by directly changing the corresponding current value to a current value greater than the relay protection setting value, which will be described in the following.
According to the relay protection method for the traction power supply system, the relay protection fixed value of the current increment can be determined by combining the historical statistical value of the locomotive load of the circuit, and then the relay protection set value of the current increment is adjusted, so that the adjusted relay protection set value is larger than the relay protection fixed value, the relay protection set value can be flexibly adjusted based on the historical statistical condition while relay protection is achieved, relay protection requirements can be met, misoperation of relay protection is avoided, accuracy is improved, and safety of power supply and driving is improved.
In some embodiments, based on fig. 1, the obtaining historical statistics of the line locomotive load in S110 may specifically include: and obtaining a traction characteristic curve and a locomotive schedule of the locomotive.
Specifically, the traction characteristic curve is a curve for representing the traction characteristic of the locomotive, from which physical quantities related to the dynamics of the locomotive such as traction force, acceleration and the like can be determined, and then the maximum value of the current increment is determined; meanwhile, the driving scheduling of the locomotive can be determined by combining with a locomotive scheduling table, so that all locomotives towed in a single power frequency period are determined, and relay protection fixed values corresponding to current increment protection functions are determined by combining with the corresponding maximum current increment values.
In some embodiments, determining relay protection settings for current delta based on historical statistics includes:
determining a traction maximum value and an acceleration maximum value in a single power frequency period based on the traction characteristic curve;
determining a maximum value of current increment in a single power frequency period based on the maximum value of traction force and the maximum value of acceleration;
determining the maximum starting number of locomotives on a traction power supply line based on a locomotive schedule;
and determining relay protection fixed values based on the maximum value of the starting quantity of the locomotives and the corresponding maximum value of the current increment of each locomotive in a single power frequency period.
Specifically, before the relay protection set value of the current increment is adjusted, the corresponding relay protection set value is determined; in order to determine the relay protection fixed value, firstly, determining the maximum value of current increase generated by a locomotive in a contact net; and then combining a locomotive schedule to count the maximum current increment index, wherein a specific statistical mode can be, for example, sum or product, so as to obtain a relay protection fixed value.
Exemplary, fig. 2 is a schematic diagram of a change of power frequency 1 cycle current increment characteristic of a motor train unit according to an embodiment of the disclosure, which corresponds to a traction characteristic curve of a locomotive.
It is known from the traction characteristic of a motor train unit that the period during which the locomotive produces a maximum value of the current increment in the catenary generally occurs during a start-up phase, for example during a start-up acceleration phase of 0-50 km/h. Specifically, by querying the train traction characteristic, the maximum traction and maximum acceleration occur during the start-up acceleration phase. Thus, on the basis of the traction characteristic curve, the traction maximum value and the acceleration maximum value in a single power frequency period can be determined through curve inquiry or data comparison. Further, since the points of the traction maximum and the acceleration maximum also correspond to the points of the current increment maximum, the current increment maximum within a single power frequency period can be determined after the traction maximum and the acceleration maximum are determined.
For example, the maximum current increment value may be obtained in combination with the number of accelerations in a single power frequency cycle of the motor train unit, as follows:
wherein F represents traction force, a represents acceleration, and round dup (20/t 1, 0) represents cycle number obtained by rounding up 20/t1, and is reserved to 0 bit after decimal point; t1 represents the duration of a single acceleration period, and 20 represents the total duration of one power frequency period. Therefore, the association relation among the traction force, the deceleration, the current and the voltage can be obtained by combining the acceleration interval time of the motor train unit and utilizing the relation of the power corresponding to the traction force and the acceleration and the relation of the power corresponding to the voltage and the current, and the maximum value of 1 power frequency cycle current increment when the motor train unit is started can be calculated.
By way of example, table 1 shows the maximum current increment at start-up for different types of motor train units.
TABLE 1 maximum list of current increment at start-up for different locomotives
And (3) testing the starting current change characteristics of the CRH1 motor train unit at the head end of a corresponding traction substation feeder line by adopting Fluke435II and E6100 power quality analyzers, as shown in figure 2. It can be seen that: when the CRH1 type motor train unit is started at the tail end of a feeder line, the maximum value of the current increment of 1 power frequency period obtained by testing is 11.3A, the error between the maximum value and the calculated value (namely 9.22A) in the table 1 is 2.08A, and the current difference value of 2.08A can correspond to part of current of the voltage loss of the overhead line system; when the CRH2 type motor train unit is started at the tail end of a feeder line, the maximum value of the current increment of 1 power frequency period obtained by testing is 4.08A, the error between the maximum value and the calculated value (namely 3.43A) in the table 1 is 0.65A, and the current difference value of 0.65A can correspond to part of current of the voltage loss of the overhead line system; when the CRH3 motor train unit is started at the tail end of a feeder line, the maximum value of the current increment of 1 power frequency period obtained by testing is 7.03A, the error between the maximum value and the calculated value (namely 6.24A) in the table 1 is 0.79A, and the current difference value of 0.79A can correspond to part of the current of the voltage loss of the overhead line system; when the CR400AF type motor train unit is started at the tail end of a feeder line, the maximum value of the current increment of 1 power frequency period obtained by testing is 6.48A, the error between the current increment and the calculated value (namely 5.62A) in the table 1 is 0.86A, and the current difference value of 0.86A can correspond to part of current of the voltage loss of the overhead line system; when the CRH380A motor train unit is started at the tail end of a feeder line, the maximum value of the current increment of 1 power frequency period obtained by testing is 4.72A, the error between the maximum value and the calculated value (namely 4.46A) in the table 1 is 0.26A, and the current difference value of 0.26A can correspond to part of current of the voltage loss of the overhead line system; thus, the current calculated from the above equation 1 is accurate in consideration of the contact net voltage loss, and the accuracy of equation 1 can be verified. The overhead line voltage loss is a voltage loss corresponding to parameters such as the resistance of the overhead line, and the like, is equal in value to the arithmetic difference between the voltage amplitude of the feeder line of the traction transformer and the voltage amplitude on the pantograph of the locomotive, and corresponds to the difference value of the current.
Thus, based on the traction characteristic of the motor train unit, the traction maximum value and the acceleration maximum value are determined, and further, the current increment maximum value is determined.
It will be appreciated that the examples in table 1 are merely examples for verifying the correctness of formula 1, and do not constitute a limitation to formula 1, and do not affect the universality thereof.
On the basis, the maximum value of the load current increment of the overhead contact system is further determined by combining a locomotive schedule, namely, the relay protection fixed value is determined.
Specifically, after the maximum value of the starting current increment of the single-train motor train unit is determined, the maximum starting number of the motor train unit with the feeder line can be determined by combining a locomotive schedule, and then the maximum value of the current increment generated by normal load is estimated.
By way of example, the maximum number of runs of the same feeder line can be determined according to the length of the feeder line of the corresponding traction substation, the running average speed of the motor train unit and the tracking interval time, and the maximum value of the load current increment of the overhead line can be further determined by combining the maximum value of the current increment of the single locomotive.
For example, when the maximum number of driving in the same feeder is 2 columns, according to the current increment setting requirement, in combination with table 1, the maximum value of the starting current increment of the CH1 single-column locomotive is 368.8A, namely 368.8 a=9.22a×40, where 40 is the acceleration number statistics in the acceleration period. The maximum value of the current increment corresponding to the two columns of reconnections is 737.6a, namely 737.6 a= 368.8a×2.
Thus, relay protection fixed values are determined.
It can be appreciated that the relay protection setting value can be adjusted to a current value slightly greater than the relay protection setting value under the condition of fully considering the current carrying capacity of the main conductive loop device of the traction power supply system. For example, if the current increment protection constant value of the traction substation is 600A before adjustment, which is smaller than the current increment maximum value 737.6a corresponding to the two rows of reconnections obtained above, it is necessary to increase the current increment protection constant value, replace the original current value with the increased current value, and realize the current increment protection without malfunction, and at this time, the increased current value needs to be larger than 737.6a and not excessively large. For example, the increased current value may be 750A, which is a current value set at a single increment of current.
In some embodiments, the relay protection setpoint is equal to a product of a maximum number of starts of the locomotive and a maximum current increment within a single power frequency cycle.
In combination with the above, when two trains are in reconnection, the relay protection fixed value is equal to the maximum value of the current increment in a single power frequency period multiplied by two.
In other embodiments, when the maximum current increment values of the trains started simultaneously are different and have larger differences, the maximum current increment values of the trains started simultaneously may be summed to obtain corresponding relay protection fixed values, which is not limited herein.
In some embodiments, fig. 3 is a schematic flow chart of another relay protection method of a traction power supply system according to an embodiment of the disclosure. On the basis of fig. 1, referring to fig. 3, the method further comprises the steps of:
and S150, determining voltage, current, impedance angle and distribution state of the locomotive in a traction power supply network corresponding to the current increment protection tripping based on the historical statistical value.
Specifically, the voltage and current data may be analyzed based on historical statistics, and the impedance angle and the distribution state of the locomotive in the traction power supply network may be analyzed, so as to verify the historical principle logic of the current increment protection, identify and correct the error node therein, and thus optimize the principle logic of the current increment protection (i.e., the corresponding software program and/or hardware logic thereof) so as to improve the accuracy of the current increment protection.
S160, acquiring history principle logic of current increment protection.
Wherein the history principle logic is the software program and/or hardware logic to be optimized.
In this step, the history principle logic of current increment protection is obtained, so that the identification and correction of the error node can be performed in combination with the analysis situation in S150.
For example, S160 may be executed before S170, and S150 may be executed after S110, but: the precedence relationship between S160 and S150 is not limited, and the precedence relationship between S160 and S110 is not limited.
S170, identifying an error node of the history principle logic based on voltage, current and impedance angle corresponding to the current increment protection tripping and the distribution state of the locomotive in the traction power supply network.
S180, correcting the error node.
Specifically, the voltage, the current and the impedance angle corresponding to the current increment protection tripping operation and the distribution state of the locomotive in the traction power supply network are combined to identify and correct error nodes in the history principle logic so as to realize the optimization of software programs and/or hardware logic corresponding to the current increment protection.
The optimization process is described in an exemplary manner with reference to the examples below.
Table 2 shows a trip data table corresponding to current increment protection, table 3 shows a distribution state table of locomotives in a traction power supply network, and correspondingly shows the distribution situation of locomotives in intervals at the trip time, namely shows train information of a train during the replay trip of CTCs; fig. 4 is a current change curve of a substation according to an embodiment of the present disclosure; wherein 71 represents 213 feeder current IF, with a maximum value 393A and a minimum value 3A;72 represents 213 the feed line current IT, with a maximum value of 567A and a minimum value of 4A;73 represents 212 the feeder current IT, with a maximum value 931A and a minimum value 4A;74 represents 212 the feed current IF, which has a maximum value of 389A and a minimum value of 3A. Fig. 5 is a schematic diagram of a traction substation power supply according to an embodiment of the present disclosure.
Analysis based on the data shown in table 2, it can be seen that: when the feeder line of the traction substation trips, the busbar voltage basically does not drop greatly, meanwhile, both the uplink circuit breaker and the downlink circuit breaker trip, and when the latter trips, the fault current is larger, and reclosing is unsuccessful.
Table 2 trip data table for current increment protection
Table 3 distribution state table of locomotive in traction power supply network
The impedance angle and the locomotive schedule are analyzed, the load impedance angle of the AC-DC-AC electric locomotive is generally below 20 degrees, and the real-time data of the locomotive corresponding to the line is retrieved and found out to obtain: the load impedance angle of the locomotive corresponding to the line is 70 degrees. Analysis based on the data shown in tables 2 and 3, it can be seen that: 3 electric locomotives are arranged on the power supply arm at the time 212 of tripping operation for the 1 st, 3 rd and 7 th times, 1 electric locomotive is arranged in the power supply arm at the time of tripping operation for the rest 5 times, and meanwhile, according to CTC data and combined comprehensive analysis of fig. 4 and 5, the following is found: trip time: when the locomotive just leaves the locomotive station and is in the current taking acceleration stage, tripping occurs, and the tripping impedance angle accords with the load angle of the locomotive.
Taking the power supply arm trip and train operation data of the substation 212, 213 at 2018, 7, 14 days in table 2 as an example, the analysis is as follows: at the time of 212QF trip at 09 time of 53 minutes and 55 seconds, a D2992 (CRH 2A reconnection), a D1852 (CRH 2A reconnection) and a G2902 (CRH 380 AL) 3-trip motor car run under a 212KX power supply arm, and a G2907 (CRH 380A reconnection) 1-trip motor car run under a 213KX power supply arm.
As known from the related technical data, the traction power corresponding to the CRH2A reconnection is 9600kW, converted into rated current, and is about 384A; the traction power corresponding to CRH380AL is 21560kW, converted into rated current, and is about 862.4A; the traction power corresponding to the CRH380A reconnection is 19200kW, and converted into rated current, which is about 768A.
As can be seen in connection with the substation power schematic shown in fig. 5: the distance from the second subarea to the current station is about 18km, the trip time G2902 motor train unit is about 9 minutes away from the preset arrival at the current station, and the motor train unit can travel about 37km according to the calculation of the running speed of the motor train unit of 250 km/h; therefore, it can be determined that when the motor train unit just passes through the second partition to separate phases from the adjacent power supply arm of the previous substation 214KX and enters the range of the power supply arm of the current substation 212 feeder, the current borne by 212KX is suddenly changed from 384A (384 a=384A/2+384A/2) to 815.2a (815.2 a=384 a+862.4a/2), and 815.2a is larger than the 212QF current increment protection set value (600A), so the 212KX current increment protection is started to act on the outlet (53 min 58 s 375 when acting time 09); at this time, the motor train unit just exits the current station to take current and accelerate, and at the moment of 212KX trip, the load 815.2A originally borne by 212KX (namely, the moment is switched to 213KX, the load current reaches 1583.2A (namely, 768 A+815.2A= 1583.2A), so that the 213QF current increment protects the action outlet (53 minutes and 59 seconds 152 when the action time is 09).
Fig. 6 is a logic schematic diagram of a history principle of current increment protection according to an embodiment of the present disclosure, which illustrates a logic principle of current increment protection. Referring to fig. 6, considering only current, the current abrupt change caused by G2902 is only 431.2a (i.e., 862.4 a/2), which is smaller than the current increment setting 600A, so the 212 feeder should not trip at the moment when G2902 enters, but actually trip. In this way, it is ascertained that the program and/or logic for current incremental protection built into the protection device has problems with metering superposition.
Referring to FIG. 6, considering the harmonic effects of the electric locomotive, the "NOT" of the harmonic blocking criterion, I2/I1, of the original protection program is similar to a long blocking point, when the second harmonic is greater than or equal to a set value KYL, the node is disconnected, and the current increment protection is not exported (the description of the relevant state of the current increment value and the time relay starting state at the moment is not given by the inquiry protection device specification); when the second harmonic is smaller than the locking setting value, the I2/I1 is unlocked, the node is closed, and meanwhile, when the current increment value DeltaI is larger than or equal to the setting value Delta IZD, a normally open contact of the reaction current increment is closed and is kept until the protection outlet is powered off and returns. Therefore, when the locomotive starts or takes current to accelerate, the current increment value DeltaI is larger than or equal to a setting value Delta IZD for the first time, a normally open contact for reacting to the current increment is closed, the time relay starts, and when the current duration is larger than or equal to the setting value of the current increment time relay, the current increment protection is caused to be performed once as long as the current increment is larger than or equal to the setting value.
Accordingly, in some embodiments, the error node comprises a metering accumulation problem node for the second harmonic and current increment values. Thus, in the steps of the flow shown in fig. 3, the error correcting node in S180 may specifically include:
correcting the logic of the wrong node as: when the current increment measuring element acts and the second harmonic is greater than the locking setting value, after the second harmonic is locked and returned, the current increment measuring element is cleared, and the measurement is restarted when the second harmonic is lower than the locking setting value.
In particular, optimizing the software program and/or hardware logic of the current delta protection response, the logical relationship of the current delta protection can be modified for the systematic defects of the protection device functions determined above, namely: when the current increment measuring element acts and the second harmonic is greater than the locking setting value, the current increment measuring element should be cleared (the normally open contact for reflecting the current increment is returned) at the same time after the second harmonic is locked and returned, and the measurement is restarted when the second harmonic is lower than the locking setting value.
The method provided by the embodiment of the disclosure is mainly suitable for improving the relay protection function of the high-speed rail traction power supply system, namely, the current increment set value of the traction substation is adjusted according to the maximum increment in a power frequency period of the line load current by combining the actual load condition of the line corresponding to the traction power supply system, and meanwhile, the current increment protection program is optimized. Specifically, on the basis of a given traction substation relay protection set value, the set value of the feeder current increment of the substation is adjusted according to the actual change of the locomotive load of the line, so that the sensitivity and reliability of the traction power supply system relay protection are ensured, and the power supply and driving safety are ensured; and correcting and optimizing the existing program algorithm and/or hardware logic of the feeder current increment protection of the traction substation, preventing the phenomena of power interruption and running order disturbance of the overhead line caused by relay protection misoperation, refusal operation and the like when the high-power locomotive is in operation, improving the relay protection reliability of the traction substation, and providing a powerful basic guarantee for the safe operation of traction power supply equipment.
The method provided by the embodiment of the disclosure perfects and promotes the relay protection function of the traction substation, effectively ensures the safe and stable operation of the high-speed rail traction power supply system, prevents the expansion of faults of traction power supply equipment, reduces the interference of the faults of the power supply equipment on the driving order, promotes the operation and maintenance management level of the equipment, has strong operability and is convenient for organization and implementation.
It can be understood that, in order to ensure safety and not to affect the train operation, the method can be performed after the train operation is finished at night, for example, checking the function and the protection action program of the current increment protection device corresponding to the traction power supply system, and upgrading the current increment protection program and modifying the set value are performed at a 'skylight point'.
It can be appreciated that before the traction substation site is subjected to set point modification and program (and/or logic optimization), debugging preparation is also required; afterwards, test verification can be performed to ensure accuracy and safety.
The embodiment of the disclosure also provides a traction power supply system relay protection device, which is used for executing the steps of any method provided by the embodiment, and has corresponding effects.
In some embodiments, fig. 7 is a schematic structural diagram of a relay protection device of a traction power supply system according to an embodiment of the disclosure. Referring to fig. 7, the traction power supply system relay protection device may include: a first obtaining module 310, configured to obtain a historical statistic of a load of the line locomotive; a first determining module 320, configured to determine a relay protection setting value of the current increment based on the historical statistics; the fixed value adjusting module 330 is configured to adjust a relay protection setting value of the current increment based on the relay protection fixed value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value.
According to the traction power supply system relay protection device, through the synergistic effect of the functional modules, the relay protection fixed value of the current increment can be determined by combining the historical statistic value of the locomotive load of the circuit, and then the relay protection set value of the current increment is adjusted, so that the adjusted relay protection set value is larger than the relay protection fixed value, the relay protection is realized, meanwhile, the size of the relay protection set value can be flexibly adjusted based on the historical statistic condition, the relay protection device is adapted to relay protection requirements, misoperation of relay protection is avoided, the accuracy is improved, and the safety of power supply and driving is improved.
In some embodiments, the first obtaining module 310 is configured to obtain a historical statistic of the locomotive load of the line, and specifically includes: and obtaining a traction characteristic curve and a locomotive schedule of the locomotive.
In some embodiments, the first determining module 320 is configured to determine a relay protection setting value of the current increment based on the historical statistics, and specifically includes: determining a traction maximum value and an acceleration maximum value in a single power frequency period based on the traction characteristic curve; determining a maximum value of current increment in a single power frequency period based on the maximum value of traction force and the maximum value of acceleration; determining the maximum starting number of locomotives on a traction power supply line based on a locomotive schedule; and determining relay protection fixed values based on the maximum value of the starting quantity of the locomotives and the corresponding maximum value of the current increment of each locomotive in a single power frequency period.
In some embodiments, the relay protection setpoint is equal to a product of a maximum number of starts of the locomotive and a maximum current increment within a single power frequency cycle.
In some embodiments, fig. 8 is a schematic structural diagram of another relay protection device of a traction power supply system according to an embodiment of the disclosure. On the basis of fig. 7, referring to fig. 8, the apparatus further includes: a second determining module 360, configured to determine, based on the historical statistics, a voltage, a current, an impedance angle, and a distribution state of the locomotive in the traction power supply network, where the voltage, the current, the impedance angle, and the locomotive correspond to the current delta protection trip; a second obtaining module 350, configured to obtain a history principle logic of current increment protection; the node identification module 370 is configured to identify an error node of the history principle logic based on the voltage, the current, the impedance angle and the distribution state of the locomotive in the traction power supply network corresponding to the current increment protection trip; the node correction module 380 is used for correcting the error node.
In some embodiments, the error node comprises a metering accumulation problem node for second harmonic and current delta values; the node correction module 380 is configured to correct an error node, and specifically includes: correcting the logic of the wrong node as: when the current increment measuring element acts and the second harmonic is greater than the locking setting value, after the second harmonic is locked and returned, the current increment measuring element is cleared, and the measurement is restarted when the second harmonic is lower than the locking setting value.
It can be understood that the relay protection device for a traction power supply system provided by the embodiments of the present disclosure can execute the steps of any one of the methods in the foregoing embodiments, and has corresponding effects, which are not described herein.
The present disclosure also provides an electronic device, including: a processor; a memory for storing processor-executable instructions; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the steps of any of the methods described above to achieve the corresponding effects.
In some embodiments, fig. 9 is a schematic structural diagram of an electronic device provided in an embodiment of the present disclosure, which illustrates a schematic structural diagram of an electronic device 500 suitable for implementing an embodiment of the present disclosure. The electronic device 500 in the embodiments of the present disclosure may include, but is not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and the like, and stationary terminals such as digital TVs, desktop computers, and the like. The electronic device shown in fig. 9 is merely an example, and should not impose any limitations on the functionality and scope of use of embodiments of the present disclosure.
As shown in fig. 9, the electronic device 500 may include a processing means (e.g., a central processor, a graphics processor, etc.) 501, which may perform various appropriate actions and processes according to a program stored in a read only memory ROM502 or a program loaded from a storage means 508 into a random access memory RAM 503. In the RAM503, various programs and data required for the operation of the electronic apparatus 500 are also stored. The processing device 501, the ROM502, and the RAM503 are connected to each other via a bus 504. An input/output I/O interface 505 is also connected to bus 504.
In general, the following devices may be connected to the I/O interface 505: input devices 506 including, for example, a touch screen, touchpad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, etc.; an output device 507 including, for example, a Liquid Crystal Display (LCD), a speaker, a vibrator, and the like; storage 508 including, for example, magnetic tape, hard disk, etc.; and communication means 509. The communication means 509 may allow the electronic device 500 to communicate with other devices wirelessly or by wire to exchange data. While fig. 9 shows an electronic device 500 having various means, it is to be understood that not all of the illustrated means are required to be implemented or provided. More or fewer devices may be implemented or provided instead.
In particular, according to embodiments of the present disclosure, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a non-transitory computer readable medium, the computer program comprising program code for performing the method shown in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication means 509, or from the storage means 508, or from the ROM 502. The above-described functions defined in the methods of the embodiments of the present disclosure are performed when the computer program is executed by the processing device 501.
It should be noted that the computer readable medium described in the present disclosure may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this disclosure, a computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present disclosure, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, fiber optic cables, RF (radio frequency), and the like, or any suitable combination of the foregoing.
In some implementations, the clients, servers may communicate using any currently known or future developed network protocol, such as HTTP (Hyper Text Transfer Protocol ), and may be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), the internet (e.g., the internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed networks.
The computer readable medium may be contained in the electronic device; or may exist alone without being incorporated into the electronic device.
The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: acquiring historical statistical values of the locomotive load of the line; determining a relay protection fixed value of the current increment based on the historical statistic value; adjusting the relay protection setting value of the current increment based on the relay protection setting value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value. According to the method and the device for determining the relay protection setting value, the relay protection setting value of the current increment can be determined by combining the historical statistical value of the locomotive load of the circuit, and then the relay protection setting value of the current increment is adjusted, so that the adjusted relay protection setting value is larger than the relay protection setting value, the relay protection setting value can be flexibly adjusted based on the historical statistical condition while relay protection is achieved, the relay protection setting value is adapted to relay protection requirements, misoperation of relay protection is avoided, accuracy is improved, and safety of power supply and driving is improved.
Computer program code for carrying out operations of the present disclosure may be written in one or more programming languages, including, but not limited to, an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units involved in the embodiments of the present disclosure may be implemented by means of software, or may be implemented by means of hardware. Wherein the names of the units do not constitute a limitation of the units themselves in some cases.
The functions described above herein may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an Application Specific Standard Product (ASSP), a system on a chip (SOC), a Complex Programmable Logic Device (CPLD), and the like.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A traction power supply system relay protection method is characterized by comprising the following steps:
acquiring historical statistical values of the locomotive load of the line; the historical statistical value is obtained based on statistics of historical monitoring values at a plurality of different moments in the historical driving process;
determining a relay protection fixed value of the current increment based on the historical statistic value;
adjusting the relay protection setting value of the current increment based on the relay protection setting value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value, and the relay protection setting value is a threshold value arranged in the relay protection device;
the method further comprises the steps of:
based on the historical statistical value, determining voltage, current, impedance angle corresponding to current increment protection tripping and distribution state of the locomotive in a traction power supply network;
acquiring a history principle logic of current increment protection;
based on voltage, current, impedance angle and distribution state of locomotive in traction power supply network corresponding to current increment protection tripping, identifying error node of the history principle logic;
correcting the error node.
2. The method of claim 1, wherein the step of obtaining historical statistics of the line locomotive load comprises:
And obtaining a traction characteristic curve and a locomotive schedule of the locomotive.
3. The traction power system relay protection method of claim 2, wherein the determining the relay protection setpoint for the current delta based on the historical statistics comprises:
determining a traction maximum value and an acceleration maximum value in a single power frequency period based on the traction characteristic curve;
determining a maximum value of current increment in a single power frequency period based on the maximum value of traction force and the maximum value of acceleration;
determining the maximum starting number of locomotives on a traction power supply line based on the locomotive schedule;
and determining the relay protection fixed value based on the maximum value of the starting quantity of the locomotives and the corresponding maximum value of the current increment of each locomotive in a single power frequency period.
4. The traction power system relay protection method of claim 3, wherein the relay protection setpoint is equal to a product of a maximum number of starts of the locomotive and a maximum current delta within a single power frequency cycle.
5. The traction power system relay protection method of claim 4, wherein the error node comprises a metering accumulation problem node for second harmonic and current delta values;
The correcting the error node includes:
correcting the logic of the error node as: when the current increment measuring element acts and the second harmonic is greater than the locking setting value, after the second harmonic is locked and returned, the current increment measuring element is cleared, and the measurement is restarted when the second harmonic is lower than the locking setting value.
6. The utility model provides a traction power supply system overload protection device which characterized in that includes:
the first acquisition module is used for acquiring historical statistic values of the line locomotive load; the historical statistical value is obtained based on statistics of historical monitoring values at a plurality of different moments in the historical driving process;
the first determining module is used for determining relay protection fixed values of current increment based on the historical statistic values;
the fixed value adjusting module is used for adjusting the relay protection set value of the current increment based on the relay protection fixed value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value, and the relay protection setting value is a threshold value arranged in the relay protection device;
the apparatus further comprises:
the second determining module is used for determining voltage, current, impedance angle and distribution state of the locomotive in the traction power supply network corresponding to the current increment protection tripping based on the historical statistical value;
The second acquisition module is used for acquiring the history principle logic of current increment protection;
the node identification module is used for identifying the error node of the history principle logic based on the voltage, the current, the impedance angle and the distribution state of the locomotive in the traction power supply network corresponding to the current increment protection tripping;
and the node correction module is used for correcting the error node.
7. A computer readable medium, characterized in that the readable medium stores a computer program for performing the steps of the method according to any one of claims 1-5.
8. An electronic device, the electronic device comprising:
a processor;
a memory for storing the processor-executable instructions;
the processor being configured to read the executable instructions from the memory and execute the instructions to implement the steps of the method according to any one of claims 1-5.
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