CN108092318B - Method and device for controlling installation capacity of traction transformer - Google Patents
Method and device for controlling installation capacity of traction transformer Download PDFInfo
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- CN108092318B CN108092318B CN201711167268.4A CN201711167268A CN108092318B CN 108092318 B CN108092318 B CN 108092318B CN 201711167268 A CN201711167268 A CN 201711167268A CN 108092318 B CN108092318 B CN 108092318B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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Abstract
The invention provides a traction transformer installation capacity control method and device, which are characterized in that response parameters of a traction transformer under set installation capacity are judged, the set installation capacity is corrected according to the judgment result until the response parameters are larger than a second preset limit value and smaller than a first preset limit value, the set installation capacity under the condition is obtained, and the set installation capacity is determined as the final installation capacity of the traction transformer. Based on the method, the installation capacity of the traction transformer meets the load requirement of the train under the condition of compact operation, meanwhile, the installation capacity of the traction transformer and the surplus space of the operation service life are reduced, the installation capacity of the traction transformer tends to be reasonable, and the operation cost of a traction power supply system is reduced.
Description
Technical Field
The invention relates to the technical field of rail transit power supply control, in particular to a method and a device for controlling the installation capacity of a traction transformer.
Background
The traction transformer is a special power transformer for providing traction electric energy for an electric locomotive or a motor train unit, and the capacity of the traction transformer needs to meet the load requirement of a train under the condition of compact operation. Generally, the traction transformer capacity is designed to meet the supply capacity requirement of the maximum load. However, since the traction load has the characteristics of a short-time large load and a small daily average load, the traction transformer in actual operation is mostly in an underload operation state, and the average load rate of the traction transformer is low, so that the installation capacity and the operation life of the traction transformer are easily more surplus, and the operation cost of the traction power supply system is increased.
Disclosure of Invention
Therefore, it is necessary to provide a method and a device for controlling the installation capacity of the traction transformer, aiming at the defect that the installation capacity and the operation life of the traction transformer are easily increased by a large margin, which increases the operation cost of a traction power supply system.
The technical scheme provided by the invention is as follows:
a traction transformer installation capacity control method comprises the following steps:
acquiring response parameters of the traction transformer under a set installation capacity;
if the response parameter is larger than the first preset limit value, increasing the set installation capacity by a preset capacity grade; if the response parameter is smaller than the second preset limit value, reducing the set installation capacity by a preset capacity grade until the response parameter is larger than the second preset limit value and smaller than the first preset limit value; wherein the second preset limit value is smaller than the first preset limit value;
and adjusting the actual installation capacity of the traction transformer to the set installation capacity.
A traction transformer installation capacity control apparatus comprising:
the response parameter acquisition module is used for acquiring the response parameters of the traction transformer under the set installation capacity;
the correction module is used for increasing the set installation capacity by a preset capacity grade when the response parameter is larger than a first preset limit value; otherwise, when the response parameter is smaller than a second preset limit value, reducing the set installation capacity by a preset capacity grade until the response parameter is larger than the second preset limit value and smaller than the first preset limit value; wherein the second preset limit value is smaller than the first preset limit value;
and the capacity control module is used for adjusting the actual installation capacity of the traction transformer to the set installation capacity.
A computer device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program, and the step of the traction transformer installation capacity control method is executed.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the traction transformer installation capacity control method.
According to the technical scheme provided by the invention, the response parameter of the traction transformer under the set installation capacity is judged, the set installation capacity is corrected according to the judgment result until the response parameter is greater than a second preset limit value and smaller than a first preset limit value, the set installation capacity under the condition is obtained, and the set installation capacity is determined as the final installation capacity of the traction transformer. Based on the method, the installation capacity of the traction transformer meets the load requirement of the train under the condition of compact operation, meanwhile, the installation capacity of the traction transformer and the surplus space of the operation service life are reduced, the installation capacity of the traction transformer tends to be reasonable, and the operation cost of a traction power supply system is reduced.
Drawings
FIG. 1 is a flow chart of a traction transformer installation capacity control method;
fig. 2 is a flowchart of a setting process of setting the installation capacity;
FIG. 3 is a flow chart of a process for obtaining a load factor;
FIG. 4 is a flow chart of an acquisition process of computing capacity;
FIG. 5 is a flow chart of a check capacity acquisition process;
FIG. 6 is a block diagram of a traction transformer installation capacity control device;
fig. 7 is a block diagram of a setting device for setting the installation capacity.
Detailed Description
For better understanding of the objects, technical solutions and effects of the present invention, the present invention will be further explained with reference to the accompanying drawings and examples. Meanwhile, the following described examples are only for explaining the present invention, and are not intended to limit the present invention.
In an embodiment, as shown in fig. 1, a flowchart of a method for controlling an installation capacity of a traction transformer of an embodiment includes the steps of:
s101, acquiring response parameters of the traction transformer under a set installation capacity;
the method comprises the steps of obtaining the maximum overload current of the traction transformer under the set installation capacity, namely adjusting the installation capacity of the traction transformer to the set installation capacity, and obtaining response parameters of the traction transformer in the operation process under the installation capacity, such as electrical parameters or environmental parameters in the operation of the traction transformer, including parameters of current or temperature and the like.
The maximum overload current is the maximum value of the overload current of the transformer determined by the overload multiple allowed under the normal load rate operation condition of the traction transformer.
Alternatively, for convenience of explanation, in this embodiment, the maximum overload current, the test point temperature, and the daily loss life of the traction transformer at the set installation capacity are obtained as an example, that is, the installation capacity of the traction transformer is adjusted to the set installation capacity, and the maximum overload current, the test point temperature, and the daily loss life of the traction transformer during operation at the installation capacity are obtained. It should be noted that the response parameters are not limited to the above list.
Optionally, the test point temperature comprises a winding hot spot temperature and/or a top layer oil temperature of the traction transformer. The winding hot spot temperature can be independently selected as the test point temperature, or the top layer oil temperature can be selected as the test point temperature, or the winding hot spot temperature and the top layer oil temperature can be selected as the test point temperature.
S102, if the response parameter is larger than a first preset limit value, increasing the set installation capacity by a preset capacity grade; if the response parameter is smaller than the second preset limit value, reducing the set installation capacity by a preset capacity grade until the response parameter is larger than the second preset limit value and smaller than the first preset limit value; and the second preset limit value is smaller than the first preset limit value.
Optionally, the first preset limit includes a first preset current limit, a first preset temperature limit, and a first time limit. The first predetermined limit is determined according to a corresponding standard, also called standard limit.
Based on this, if the response parameter is greater than the first preset limit, the process of increasing the set installation capacity by a preset capacity level includes the steps of:
and if the maximum overload current is larger than a first preset current limit value, the temperature of the test point is larger than a first preset temperature limit value or the daily loss life is larger than a first time limit value, increasing the preset installation capacity by a preset capacity grade.
Optionally, the second preset limit comprises a second preset current limit, a second preset temperature limit, and a second time limit.
Based on this, if the response parameter is smaller than the second preset limit, the process of reducing the set installation capacity by a preset capacity level includes the steps of:
and if the maximum overload current is smaller than a second preset current limit value, the temperature of the test point is smaller than a second preset temperature limit value or the daily loss life is smaller than a second time limit value, reducing the preset installation capacity by a preset capacity grade.
The traction transformers with different wiring types can be set with different overload multiples during production, and the maximum load current of the traction transformer with the preset wiring type and the preset installation capacity can be set as a first preset current limit value. Optionally, the maximum load current may also be adaptively adjusted according to an actual working environment of the traction transformer, and the adjusted maximum load current is set as the first preset current limit value.
The first preset temperature limit value is the maximum temperature value of a test point of the traction transformer in the operation process. When winding hot spots are selected as test points, a first preset temperature limit value is set as 140 ℃; when the top oil temperature is selected as a test point, a first preset temperature limit value is set to be 105 ℃; when winding hot spot and top layer oil temperatures are selected as test points, a first preset temperature limit is set to 105 ℃. Optionally, the first preset temperature limit may be adaptively adjusted according to an actual operating environment of the traction transformer.
The first time limit is a daily loss life of 24 hours, and optionally, the first time limit can be adaptively adjusted according to the actual working environment of the traction transformer. Generally, when the hot spot temperature of the winding of the traction transformer is 98 ℃, the service life loss rate of the transformer is 1. On the basis, the service life loss of the transformer is doubled when the temperature of the winding hot spot is increased by 6 ℃, and the service life loss is doubled when the temperature is reduced by 6 ℃. Because the load of the transformer is different in different periods and the temperature is different, the life loss rate of the transformer in different periods needs to be calculated according to the temperature in different periods, the actual life loss in different periods is obtained according to the life loss rate multiplied by the duration of different periods, and the total life loss in one day, namely the daily loss life, is obtained by taking 24 hours as a cycle and accumulating the life loss.
Wherein, when the winding hot spot temperature is thetahIn time, the relative life loss rate V of the traction transformer is:
the change of the traction load is directly influenced by the train operation diagram, and the daily loss life L in one day is calculated by taking one day (24h) as a change cycle:
in the formula: vnIs the relative loss of life rate in the nth time interval; t is tnIs the duration of the nth time interval; n is the ordinal number of each time interval within the considered period; n is the total number of time intervals in the considered period.
The preset installation capacity is increased by a preset capacity grade, namely, the set installation capacity is divided into a plurality of preset capacity grades, the preset capacity grade is increased on the basis of the originally set installation capacity, and the originally set installation capacity is updated by the increased result.
Optionally, the preset capacity level is a capacity level determined according to the R10 capacity series. The installation capacity is set to 10MV & A, 12.5MV & A, 16MV & A, 20MV & A, 25MV & A, 31.5MV & A, 40MV & A, 50MV & A, 63MV & A, etc. For example, 12.5MV & A is greater than 10MV & A by a predetermined capacity level, and 16MV & A is greater than 12.5MV & A by a predetermined capacity level. Optionally, the first preset temperature limit may be adaptively adjusted according to an actual operating environment of the traction transformer.
And multiplying the first preset current limit value by the first preset proportion to obtain a second preset current limit value. And multiplying the first preset temperature limit value by a second preset proportion to obtain a second preset temperature limit value. And multiplying the first time limit value by a second preset proportion to obtain a second time limit value. Optionally, the first preset proportion is 80%, the second preset proportion is 65%, and the third preset proportion is 50%. Optionally, the first preset proportion, the second preset proportion or the third preset proportion may be adaptively adjusted according to an actual working environment of the traction transformer.
Take the preset capacity level as the capacity level determined according to the R10 capacity series as an example. The preset installation capacity is reduced by one preset capacity grade, namely, the set installation capacity is divided into a plurality of preset capacity grades, one preset capacity grade is reduced on the basis of the original set installation capacity, and the original set installation capacity is updated by the reduced result.
The set installation capacity is continuously adjusted, the maximum overload current, the temperature of the test point and the daily loss life under different installation capacities are obtained until the result is converged to be that the maximum overload current is smaller than a first preset current limit value and larger than a second preset current limit value, the temperature of the test point is smaller than the first preset temperature limit value and larger than the second preset temperature limit value, and the daily loss life is smaller than a first time limit value and larger than a second time limit value, so that the set installation capacity under the convergence condition is obtained.
And S103, adjusting the actual installation capacity of the traction transformer to the set installation capacity.
In the method for controlling the installation capacity of the traction transformer provided by this embodiment, the response parameter of the traction transformer under the set installation capacity is judged, the set installation capacity is corrected according to the judgment result until the response parameter is greater than the second preset limit and smaller than the first preset limit, the set installation capacity under the condition is obtained, and the set installation capacity is determined as the final installation capacity of the traction transformer. Based on the method, the installation capacity of the traction transformer meets the load requirement of the train under the condition of compact operation, meanwhile, the installation capacity of the traction transformer and the surplus space of the operation service life are reduced, the installation capacity of the traction transformer tends to be reasonable, and the operation cost of a traction power supply system is reduced.
Alternatively, in an embodiment, as shown in fig. 2, a flowchart of a setting process for setting the installation capacity includes the steps of:
s201, obtaining the calculated capacity, the maximum capacity and the load coefficient of the train line corresponding to the traction transformer.
The calculated capacity, the maximum capacity and the load factor of the train line corresponding to the traction transformer can be obtained according to the established running state of the train line corresponding to the traction transformer. The train line corresponding to the traction transformer is a train line in which the traction transformer is put into operation.
Optionally, in an embodiment, as shown in fig. 3, a process of obtaining a load factor of a train line corresponding to a traction transformer is a flowchart of a process of obtaining a load factor, and includes the steps of:
s301, acquiring the daily average current and the peak current of a power supply arm of a train line corresponding to a traction transformer; and the peak current of the power supply arm is greater than the average daily current of the power supply arm.
The peak current of the power supply arm is a large current which is generated by a traction transformer in the running process of the train and lasts for a period of time, and is an average current in the period of time.
S302, obtaining a load coefficient according to the ratio of the daily average current of the power supply arm to the rated current and the ratio of the peak current of the power supply arm to the rated current; wherein the rated current is the rated current of the traction transformer.
Setting several peak currents, such as maximum current I lasting 23min, according to the train operationmax1Maximum current I lasting 10minmax2Maximum current I lasting 2minmax3And the like.
Determining load factors K of different durations1＝I/IN、K2＝Imax1/IN、K3＝Imax2/IN、K4＝Imax3/INAnd the like, wherein I is the daily average current of the power supply arm, INIs the rated current of the traction transformer.
The calculation formulas of the traction transformers with different wiring lines are different, and a three-phase impedance balance type traction transformer is taken as an example:
in the formula, KtTemperature coefficient, generally KtThe adaptability can be adjusted when the value is 0.9; u shapeN-the traction transformer output rated voltage is 27.5 kV; and S is the set installation capacity of the traction transformer.
According to the load coefficient obtaining method provided by the implementation, the load coefficients in different time periods are obtained according to the dynamic running state of the traction transformer, and the reference of the load coefficients is improved.
Optionally, after the load coefficient is obtained, the winding hot spot temperature of the traction transformer may be approximately calculated according to the load coefficient and the top oil temperature, and the calculation process is as follows:
the winding hot spot temperature increase corresponding to the load factor K is given by:
accordingly, the winding hot spot temperature reduction value corresponding to the load factor K is given by:
taking a traction transformer with a cooling mode of ONAF as an example, the meaning and value of each parameter in the formula are as follows:
θh(t)is the winding hot spot temperature for a certain time period; thetaaThe temperature was taken at ambient temperature and 30 ℃. Delta thetaoiIs the initial top oil temperature rise. Delta thetaorThe steady-state temperature rise of the top layer oil under rated loss is 52 ℃. R is the ratio of load loss and no-load loss under rated current, and takes 6. K is a load factor (load current/rated current) and is taken according to a load curve graph. x is the exponential power (oil index) of the total loss to the temperature rise of the top layer oil (in the oil tank), and the value is 0.8. y is the exponential power of the current to the winding temperature rise (winding index), and the value is 1.3. H is the hot spot coefficient, and the value is 1.3. grThe value of the gradient of the average temperature of the winding to the average temperature of the oil under the rated current is 14.5K.
Function f1(t) represents the relative increase in top layer oil temperature rise at a steady state value of 1:
in the formula: k is a radical of11Taking 0.5 as a thermal model constant; tau isOThe average oil time constant was taken to be 150 min.
Function(s)f2(t) represents the relative increase of the hot-point to the top oil temperature gradient at a steady state value of 1:
in the formula: k is a radical of21、k22Taking the thermal model constants as 2.0; tau iswAnd taking 7min as a winding time constant.
Function f3(t) represents the relative reduction of the top oil to ambient temperature gradient at a total reduction value of 1:
the meaning and value of each parameter corresponding to different traction transformers are different, which are not listed here.
Optionally, in an embodiment, as shown in fig. 4, a process of acquiring the calculated capacity of the train line corresponding to the traction transformer is a flowchart of an acquiring process of the calculated capacity, and includes the steps of:
s401, obtaining the average current of a power supply arm, the effective current of the power supply arm and the winding current of the traction transformer, wherein the average current of the power supply arm corresponds to the train line, and the winding current of the traction transformer corresponds to the train line.
And S402, determining a capacity calculation formula corresponding to the traction transformer according to the average current of the power supply arm, the effective current of the power supply arm and the winding current.
The capacity calculation formulas of the traction transformer are different under different conditions, and the corresponding capacity calculation formulas can be searched according to the average current of the power supply arm, the effective current of the power supply arm and the winding current.
And S403, substituting the average current of the power supply arm and the effective current of the power supply arm into a capacity calculation formula to obtain the calculated capacity.
According to the method for acquiring the calculated capacity, different calculated capacity formulas are determined according to the current states of the train lines corresponding to the traction transformers of the traction transformers, and the accuracy of the calculated capacity is improved.
And S202, obtaining the checking capacity of the traction transformer according to the ratio of the maximum capacity to the load coefficient.
Wherein the maximum capacity of the traction transformer corresponding to the train line is the capacity S required by the train in tight runningmaxIf the allowable load factor under the normal load rate operation condition of the traction transformer is k, the check capacity of the traction transformer is SSchool＝SmaxAnd/k + A, wherein A is a correction factor.
Optionally, in an embodiment, as shown in fig. 5, a flowchart of a process for obtaining the check capacity is shown, where the process for obtaining the check capacity of the traction transformer according to a ratio of the maximum capacity to the load factor includes the steps of:
s501, acquiring the daily average load rate of the train line corresponding to the traction transformer.
And S502, if the daily average load rate is smaller than a first preset value, obtaining a corrected load coefficient of the traction transformer corresponding to the train line according to the product of the minimum load coefficient and a preset correction coefficient.
And when the daily average load rate is smaller than a first preset value, calculating the product of the minimum load coefficient of the overload multiple and a preset correction coefficient. Generally, the minimum daily average load rate can be determined as the normal load rate according to the train line corresponding to the traction transformer, and is set as a first preset value, for example, the common speed single line is 0.5, the common speed compound line is 0.6, and the passenger dedicated line or the heavy-duty railway is 0.7-0.8. Based on this, the overload multiple k is correctedRepair theAnd k × n, wherein n is a preset correction coefficient.
And S503, obtaining the checking capacity of the traction transformer according to the ratio of the maximum capacity to the corrected overload multiple load coefficient.
When the daily average load rate is smaller than a first preset value, checking the capacity S of the traction transformerSchool＝Smax/kRepair the+ B, where B is a correction factor.
According to the method for acquiring the check capacity provided by the implementation, whether the minimum load coefficient is corrected or not is determined according to the daily average load rate, when the daily average load rate is smaller than a first preset value, the preset correction coefficient is introduced to correct the minimum load coefficient, and the check capacity obtained when the daily average load rate is smaller than the first preset value is the corrected check capacity, so that the reference of the check capacity is improved.
And S203, if the calculated capacity is larger than or equal to the checking capacity, setting the calculated capacity as the set installation capacity, otherwise, setting the checking capacity as the set installation capacity.
Wherein the larger value of the calculation capacity and the check capacity is set as a set installation capacity,
the method for setting the installation capacity provided in this embodiment determines the installation capacity according to the calculated capacity, the maximum capacity, and the load factor of the train line corresponding to the traction transformer. Based on the method, the determined set installation capacity can be adjusted according to different traction transformers and different operation states of the traction transformers, the reference of the set installation capacity is improved, the correction times of the set installation capacity are reduced, and the efficiency of obtaining the final installation capacity is improved.
In an embodiment, as shown in fig. 6, a block diagram of a traction transformer installation capacity control device according to an embodiment includes:
a response parameter obtaining module 601, configured to obtain a response parameter of the traction transformer at a set installation capacity;
a modification module 602, configured to increase the set installation capacity by a preset capacity level when the response parameter is greater than the first preset limit; otherwise, when the response parameter is smaller than a second preset limit value, reducing the set installation capacity by a preset capacity grade until the response parameter is larger than the second preset limit value and smaller than the first preset limit value; wherein the second preset limit value is smaller than the first preset limit value;
and a capacity control module 603 for adjusting the actual installation capacity of the traction transformer to the set installation capacity.
The traction transformer installation capacity control device provided in this embodiment determines the response parameter of the traction transformer under the set installation capacity, corrects the set installation capacity according to the determination result until the response parameter is greater than the second preset limit and smaller than the first preset limit, obtains the set installation capacity under the condition, and determines the set installation capacity as the final installation capacity of the traction transformer. Based on the method, the installation capacity of the traction transformer meets the load requirement of the train under the condition of compact operation, meanwhile, the installation capacity of the traction transformer and the surplus space of the operation service life are reduced, the installation capacity of the traction transformer tends to be reasonable, and the operation cost of a traction power supply system is reduced.
In one embodiment, as shown in fig. 7, a block diagram of a setting device for setting an installation capacity includes:
and a parameter setting obtaining module 701, configured to obtain the calculated capacity, the maximum capacity, and the load coefficient of the train line corresponding to the traction transformer.
The setting parameter obtaining module 701 includes:
the first current acquisition module is used for acquiring the daily average current of a power supply arm and the peak current of the power supply arm of the train line corresponding to the traction transformer; and the peak current of the power supply arm is greater than the average daily current of the power supply arm.
The load parameter obtaining module is used for obtaining a load coefficient according to the ratio of the daily average current of the power supply arm to the rated current and the ratio of the peak current of the power supply arm to the rated current; wherein the rated current is the rated current of the traction transformer.
And acquiring load coefficients of different time periods according to the dynamic running state of the traction transformer, and improving the reference of the load coefficients.
The setting parameter obtaining module 701 further includes:
and the second current acquisition module is used for acquiring the average current of the power supply arm, the effective current of the power supply arm and the winding current of the traction transformer, which correspond to the train line, of the traction transformer.
And the formula selection module is used for determining a capacity calculation formula corresponding to the traction transformer according to the average current of the power supply arm, the effective current of the power supply arm and the winding current.
And the calculation capacity obtaining module is used for substituting the average current of the power supply arm, the effective current of the power supply arm and the winding current into a capacity calculation formula to obtain the calculation capacity.
Different capacity calculation formulas are determined according to the current states of the traction transformers corresponding to the train lines, and the accuracy of capacity calculation is improved.
And a checking capacity obtaining module 702, configured to obtain a checking capacity of the traction transformer according to a ratio of the maximum capacity to the load coefficient.
The checking capacity obtaining module 702 includes:
and the daily average load rate acquisition module is used for acquiring the daily average load rate of the train line corresponding to the traction transformer.
And the corrected load coefficient obtaining module is used for obtaining the corrected load coefficient of the train line corresponding to the traction transformer according to the product of the minimum load coefficient and the preset corrected coefficient when the daily average load rate is smaller than the first preset value.
And the checking capacity correction module is used for obtaining the checking capacity of the traction transformer according to the ratio of the maximum capacity to the correction load coefficient.
And the setting module of the set installation capacity is used for setting the calculation capacity as the set installation capacity when the calculation capacity is larger than or equal to the checking capacity, and otherwise, setting the checking capacity as the set installation capacity.
The setting device for setting the installation capacity provided in this embodiment determines the set installation capacity according to the calculated capacity, the maximum capacity, and the load factor of the train line corresponding to the traction transformer. Based on the method, the determined set installation capacity can be adjusted according to different traction transformers and different operation states of the traction transformers, the reference of the set installation capacity is improved, the correction times of the set installation capacity are reduced, and the efficiency of obtaining the final installation capacity is improved.
The invention also provides computer equipment which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of any one embodiment of the traction transformer installation capacity control method.
The computer device provided by this embodiment determines the response parameter of the traction transformer under the set installation capacity, corrects the set installation capacity according to the determination result until the response parameter is greater than the second preset limit and smaller than the first preset limit, obtains the set installation capacity under the condition, and determines the set installation capacity as the final installation capacity of the traction transformer. Based on the method, the installation capacity of the traction transformer meets the load requirement of the train under the condition of compact operation, meanwhile, the installation capacity of the traction transformer and the surplus space of the operation service life are reduced, the installation capacity of the traction transformer tends to be reasonable, and the operation cost of a traction power supply system is reduced.
The invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of any one of the embodiments of the traction transformer installation capacity control method described above. Further, the program stored in one storage medium is generally executed by directly reading the program out of the storage medium or by installing or copying the program into a storage device (such as a hard disk and or a memory) of the data processing device. Such a storage medium therefore also constitutes the present invention. The storage medium may use any type of recording means, such as a paper storage medium (e.g., paper tape, etc.), a magnetic storage medium (e.g., a flexible disk, a hard disk, a flash memory, etc.), an optical storage medium (e.g., a CD-ROM, etc.), a magneto-optical storage medium (e.g., an MO, etc.), and the like.
The computer-readable storage medium provided in this embodiment determines the response parameter of the traction transformer at the set installation capacity, corrects the set installation capacity according to the determination result until the response parameter is greater than the second preset limit and smaller than the first preset limit, obtains the set installation capacity under the condition, and determines the set installation capacity as the final installation capacity of the traction transformer. Based on the method, the installation capacity of the traction transformer meets the load requirement of the train under the condition of compact operation, meanwhile, the installation capacity of the traction transformer and the surplus space of the operation service life are reduced, the installation capacity of the traction transformer tends to be reasonable, and the operation cost of a traction power supply system is reduced.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A method for controlling the installation capacity of a traction transformer is characterized by comprising the following steps:
dividing the set installation capacity into a plurality of preset capacity grades;
acquiring response parameters of the traction transformer under the current set installation capacity;
if the response parameter is greater than a first preset limit value, increasing the current set installation capacity by a preset capacity grade, and if the response parameter is less than a second preset limit value, reducing the current set installation capacity by a preset capacity grade until the response parameter is greater than the second preset limit value and less than the first preset limit value; wherein the second preset limit is smaller than the first preset limit; the second preset limit value comprises a second preset current limit value, a second preset temperature limit value and a second time limit value;
adjusting the actual installation capacity of the traction transformer to the adjusted set installation capacity;
the response parameters comprise the maximum overload current of the traction transformer, the temperature of the test point and the daily loss life;
the first preset limit value comprises a first preset current limit value, a first preset temperature limit value and a first time limit value;
if the response parameter is greater than a first preset limit value, the process of increasing the set installation capacity by a preset capacity level includes the steps of:
if the maximum overload current is larger than a first preset current limit value, the temperature of the test point is larger than a first preset temperature limit value or the daily loss life is larger than a first time limit value, increasing the set installation capacity by a preset capacity grade;
multiplying the first preset current limit value by a first preset proportion to obtain a second preset current limit value;
multiplying the first preset temperature limit value by a second preset proportion to obtain a second preset temperature limit value;
multiplying the first time by a third preset proportion to obtain a second time limit value;
wherein, if the response parameter is smaller than a second preset limit value, the process of reducing the set installation capacity by a preset capacity level includes the steps of:
and if the maximum overload current is smaller than a second preset current limit value, the temperature of the test point is smaller than a second preset temperature limit value or the daily loss life is smaller than a second time limit value, reducing the set installation capacity by a preset capacity grade.
2. The traction transformer installation capacity control method according to claim 1, wherein the step of obtaining the daily loss life includes:
according to the temperature of the test pointθ hAnd obtaining a relative life loss rate V of the traction transformer according to the following formula:
the daily lost life is obtained using the following formula:
wherein, VnIs the relative loss of life rate in the nth time interval; t is tnIs the duration of the nth time interval; n is each of the periods under considerationOrdinal number of time interval; n is the total number of time intervals in the considered period.
3. The traction transformer installation capacity control method according to claim 1, further comprising the step of setting the set installation capacity; the step of setting the installation capacity includes the steps of:
acquiring the calculated capacity, the maximum capacity and the load coefficient of the train line corresponding to the traction transformer;
obtaining the checking capacity of the traction transformer according to the ratio of the maximum capacity to the load coefficient;
and if the calculated capacity is larger than or equal to the checking capacity, setting the calculated capacity as a set installation capacity, otherwise, setting the checking capacity as the set installation capacity.
4. The traction transformer installation capacity control method according to claim 3, wherein the process of obtaining the check capacity of the traction transformer according to the ratio of the maximum capacity to the load factor comprises the steps of:
acquiring the daily average load rate of the train line corresponding to the traction transformer;
if the daily average load rate is smaller than a first preset value, obtaining a corrected load coefficient of the traction transformer corresponding to the train line according to the product of the minimum load coefficient and a preset correction coefficient;
and obtaining the checking capacity of the traction transformer according to the ratio of the maximum capacity to the correction load coefficient.
5. The method for controlling the installation capacity of the traction transformer according to claim 3 or 4, wherein the step of obtaining the load factor of the train line corresponding to the traction transformer comprises the steps of:
acquiring the daily average current and the peak current of a power supply arm of a train line corresponding to a traction transformer; the peak current of the power supply arm is greater than the average daily current of the power supply arm;
obtaining the load coefficient according to the ratio of the daily average current of the power supply arm to the rated current and the ratio of the peak current of the power supply arm to the rated current; and the rated current is the rated current of the traction transformer.
6. The traction transformer installation capacity control method according to claim 3 or 4, wherein the process of obtaining the calculated capacity of the train line corresponding to the traction transformer includes the steps of:
acquiring the average current of a power supply arm, the effective current of the power supply arm and the winding current of a traction transformer of a corresponding train line of the traction transformer;
determining a capacity calculation formula corresponding to the traction transformer according to the average current of the power supply arm, the effective current of the power supply arm and the winding current;
and substituting the average current of the power supply arm and the effective current of the power supply arm into the capacity calculation formula to obtain the calculated capacity.
7. A traction transformer installation capacity control apparatus, comprising:
the response parameter acquisition module is used for dividing the set installation capacity into a plurality of preset capacity grades; acquiring response parameters of the traction transformer under the set installation capacity;
the correction module is used for increasing the current set installation capacity by a preset capacity grade when the response parameter is larger than a first preset limit value, and reducing the current set installation capacity by a preset capacity grade when the response parameter is smaller than a second preset limit value until the response parameter is larger than the second preset limit value and smaller than the first preset limit value; wherein the second preset limit is smaller than the first preset limit; the second preset limit value comprises a second preset current limit value, a second preset temperature limit value and a second time limit value;
the capacity control module is used for adjusting the actual installation capacity of the traction transformer to the set installation capacity;
the response parameters comprise the maximum overload current of the traction transformer, the temperature of the test point and the daily loss life;
the first preset limit value comprises a first preset current limit value, a first preset temperature limit value and a first time limit value;
the step of the modification module executing a process of increasing the set installation capacity by a preset capacity level when the response parameter is greater than a first preset limit value includes:
if the maximum overload current is larger than a first preset current limit value, the temperature of the test point is larger than a first preset temperature limit value or the daily loss life is larger than a first time limit value, increasing the set installation capacity by a preset capacity grade;
the second preset current limit value is obtained by multiplying the first preset current limit value by a first preset proportion; the second preset temperature limit is obtained by multiplying the first preset temperature limit by a second preset proportion; the second time limit is obtained by multiplying the first time by a third preset proportion;
the step of the correction module executing a process of reducing the currently set installation capacity by one preset capacity level when the response parameter is smaller than a second preset limit value includes:
and if the maximum overload current is smaller than a second preset current limit value, the temperature of the test point is smaller than a second preset temperature limit value or the daily loss life is smaller than a second time limit value, reducing the set installation capacity by a preset capacity grade.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any of claims 1-6 are implemented when the program is executed by the processor.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
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| CN111291522B (en) * | 2020-03-13 | 2023-06-06 | 许昌许继风电科技有限公司 | Method for calculating capacity of dry-type transformer of wind generating set and dry-type transformer |
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| 电气化铁路牵引供电系统大修设计研究;刘让雄;《西南交通大学硕士论文》;20170802;第36-53页 * |
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