CN114284999A - Transformer grouping switching-on device based on real-time magnetic flux error estimation - Google Patents
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Abstract
The invention discloses a transformer grouping switching-on device based on real-time magnetic flux error estimation, which comprises: the sampling unit is used for detecting three-phase current and voltage at the side of a power grid and the side of a transformer in real time, performing delay compensation processing on a plurality of paths of sampling signals collected by the sampling unit group, and outputting synchronous signals after eliminating the angle deviation of a voltage transformer and a current transformer; the data preprocessing unit is connected with the sampling unit, performs characteristic extraction on the synchronous signals obtained from the sampling unit by adopting a genetic algorithm, calculates expected magnetic flux on the power grid side and residual magnetic flux on the transformer side as characteristic information and outputs the characteristic information; and the data processing unit is connected with the data preprocessing unit, analyzes the real-time switch control command of the transformer by adopting a magnetic error technology according to the characteristic information output by the data preprocessing unit, and converts the real-time switch control command into a three-phase breaker switch control command for output. The excitation surge current is thoroughly eliminated, the running reliability of the transformer is improved, and the damage to power equipment is reduced.
Description
Technical Field
The invention relates to the technical field of transformer control, in particular to a transformer grouping switching-on device based on real-time magnetic flux error estimation.
Background
Due to the continuous development of power technology, a power utilization area and a power production area are not in the same area, or local power is surplus or insufficient, remote power transmission is needed, no matter what operation is needed, even normal overhaul of regional power lines and equipment is needed, power is cut off, after the overhaul and other tasks are completed, a transformer is switched on, and in the process, no-load switching-on is easily carried out.
The transformer no-load switching-on process can generate excitation inrush current, so that the transformer relay protection misoperation is easy to occur, and adverse effects can be generated on transformer equipment and a power grid. A large amount of second and third harmonics can increase electromagnetic loss and form backflow, and the higher harmonics can cause damage to sensitive equipment of the power system, but the power supply quality of the power system is reduced.
The magnetizing inrush current generated by the transformer is usually cut down by external measures, which generally include a series resistance method, a reduced remanence method, a parallel capacitor method, a changed winding method, and the like. The method of connecting resistors in series is simple and feasible, but has limited functions. The methods of reducing remanence, parallel capacitance, and changing windings are too complex.
Therefore, there is a need for a method and apparatus that essentially eliminates magnetizing inrush current.
Disclosure of Invention
The invention aims to provide a transformer grouping switching-on device based on real-time magnetic flux error estimation, which effectively inhibits the magnetizing inrush current generated by a transformer and improves the use safety of the transformer.
In order to solve the above technical problem, an embodiment of the present invention provides a transformer block switching device based on real-time magnetic flux error estimation, including:
the sampling unit is used for detecting three-phase current and voltage at the side of a power grid and the side of a transformer in real time, performing hysteresis compensation processing on a plurality of paths of sampling signals collected by the sampling unit group, and outputting synchronous signals after eliminating the angle deviation of the voltage transformer and the current transformer;
the data preprocessing unit is connected with the sampling unit, performs feature extraction on the synchronous signals obtained from the sampling unit by adopting a genetic algorithm, calculates expected magnetic flux on the side of a power grid and residual magnetic flux on the side of a transformer as characteristic information and outputs the characteristic information;
and the data processing unit is connected with the data preprocessing unit, analyzes the real-time switch control command of the transformer by adopting a magnetic error technology according to the characteristic information output by the data preprocessing unit, and converts the real-time switch control command into a three-phase breaker switch control command for output.
The system also comprises an isolated phase closing unit connected with the data processing unit and used for carrying out corresponding control operation on the three-phase circuit breaker corresponding to the transformer through a relay according to the three-phase circuit breaker switch control command.
The device also comprises a storage unit connected with the data preprocessing unit and the data processing unit and used for storing the characteristic information and the three-phase breaker switch control command.
The storage unit comprises a first storage sub-unit and a second storage sub-unit, the first storage sub-unit is used for storing the characteristic information, and the second storage sub-unit is used for storing the three-phase breaker switch control command.
The first storage sub-unit and the second storage sub-unit comprise at least one of a TF memory card with the model number of SDSQUNC-032G-ZN3MN, a U disk and a hard disk.
The data preprocessing unit comprises at least one of an ARM processor chip with the model of EPX10 and a 51-series single chip microcomputer.
The sampling unit comprises a voltage transformer and a current transformer and is used for detecting three-phase current and voltage of the power grid side and the transformer side in real time.
The data processing unit comprises a processor chip with the model of DSP TMS320F 28335.
The system also comprises a state indicator lamp connected with the isolated phase closing unit and used for sending out an indication warning after the isolated phase closing unit outputs the three-phase breaker switch control command to control the relay in a preset time period.
The three-phase circuit breaker switching control device further comprises a communication module connected with the split-phase switching-on unit and used for outputting the three-phase circuit breaker switching control command to the outside or receiving the control command.
Compared with the prior art, the transformer grouping switching-on device based on the real-time magnetic flux error estimation provided by the embodiment of the invention has the following advantages:
the transformer grouping switching-on device based on the real-time magnetic flux error estimation provided by the embodiment of the invention detects three-phase current and voltage at the side of a power grid and the side of a transformer in real time, carries out hysteresis compensation processing on a plurality of paths of sampling signals collected by a sampling unit group, and outputs synchronous signals after eliminating the angle deviation of a voltage transformer and a current transformer; performing feature extraction on the synchronous signals obtained from the sampling unit by adopting a genetic algorithm, calculating expected magnetic flux on the power grid side and residual magnetic flux on the transformer side as characteristic information, and outputting the characteristic information; according to the characteristic information output by the data preprocessing unit, a magnetic quantity error technology is adopted for analysis, a real-time switch control command of the transformer is analyzed and converted into a three-phase breaker switch control command for output, so that the excitation inrush current can be fundamentally and thoroughly eliminated, the running reliability of the transformer is improved, the damage to power equipment is reduced, the structure is simple, the automatic running can be realized, less equipment is added, the increase of the operating cost is very limited, and the cost-effectiveness ratio is greatly improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a specific embodiment of a transformer grouping switching-on device based on real-time magnetic flux error estimation according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another specific implementation of a transformer block switching device based on real-time magnetic flux error estimation according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another specific implementation of the transformer block closing device based on real-time magnetic flux error estimation according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, fig. 1 is a schematic structural diagram of an embodiment of a transformer block closing device based on real-time magnetic flux error estimation according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of another specific implementation of a transformer block switching device based on real-time magnetic flux error estimation according to an embodiment of the present invention; fig. 3 is a schematic structural diagram of another specific implementation of the transformer block closing device based on real-time magnetic flux error estimation according to the embodiment of the present invention.
In a specific embodiment, the transformer block switching device based on real-time magnetic flux error estimation includes:
the sampling unit 10 is used for detecting three-phase current and voltage at a power grid side and a transformer side in real time, performing hysteresis compensation processing on a plurality of paths of sampling signals collected by the sampling unit 10, and outputting synchronous signals after eliminating the angle deviation of the voltage transformer and the current transformer;
a data preprocessing unit 20 connected to the sampling unit 10, extracting the characteristics of the synchronous signal obtained from the sampling unit 10 by using a genetic algorithm, calculating an expected magnetic flux on the grid side and a residual magnetic flux on the transformer side as characteristic information, and outputting the characteristic information;
and the data processing unit 30 is connected with the data preprocessing unit 20, analyzes the real-time switch control command of the transformer by adopting a magnetic error technology according to the characteristic information output by the data preprocessing unit 20, and converts the real-time switch control command into a three-phase breaker switch control command for output.
Detecting three-phase current and voltage of a power grid side and a transformer side in real time, performing hysteresis compensation processing on multi-path sampling signals collected by 10 groups of sampling units, and outputting synchronous signals after eliminating the angle deviation of the voltage transformer and the current transformer; extracting the characteristics of the synchronous signals obtained from the sampling unit 10 by using a genetic algorithm, calculating expected magnetic flux on the power grid side and residual magnetic flux on the transformer side as characteristic information, and outputting the characteristic information; according to the characteristic information output by the data preprocessing unit 20, a magnetic quantity error technology is adopted for analysis, a real-time switch control command of the transformer is analyzed and converted into a three-phase breaker switch control command for output, so that the excitation surge current can be fundamentally and thoroughly eliminated, the running reliability of the transformer is improved, the damage of power equipment is reduced, the structure is simple, the automatic running can be realized, fewer devices are added, the increase of the operating cost is very limited, and the cost-effectiveness ratio is greatly improved
In the present application, the data processing unit 30 is adopted to directly output the three-phase breaker switch control command and perform corresponding control, but generally, due to a large difference in properties such as voltage of electrical signals of the two, or other reasons, the three-phase breaker switch control command and the three-phase breaker switch control command cannot be directly controlled, and therefore, in an embodiment, the transformer grouping closing apparatus based on real-time magnetic flux error estimation further includes an isolated phase closing unit 40 connected to the data processing unit 30, and configured to perform corresponding control operation on the three-phase breaker corresponding to the transformer through a relay according to the three-phase breaker switch control command.
The split-phase closing unit 40 is used for command conversion and direct control, so that the control efficiency is high, and the control safety is good.
The structure of the corresponding closing unit is not limited in the application.
Because a large amount of operations are needed to obtain control in the application, a large amount of data is necessarily generated in the process, and although the control can be directly performed, if the control efficiency cannot meet the requirement, the problem cannot be found or the original data can be obtained only by a more complicated mode.
Therefore, in order to improve the management efficiency, in an embodiment, the transformer packet switching-on device based on the real-time estimation of the magnetic flux error further includes a storage unit 50 connected to the data preprocessing unit 20 and the data processing unit 30, and configured to store the characteristic information and the three-phase breaker switch control command.
The type, storage space, arrangement position, and the like of the storage unit 50 are not limited in the present application.
To further improve the management efficiency, in one embodiment, the storage unit 50 includes a first storage sub-unit for storing the characteristic information and a second storage sub-unit for storing the three-phase breaker switching control command.
By adopting a classified storage mode, the management efficiency is improved, and of course, a person skilled in the art can also carry out marshalling by adopting a mode of marshalling characteristic information and three-phase breaker switch control commands, so that the characteristic information and the three-phase breaker switch control commands are in one-to-one correspondence, and the data use efficiency can be improved under the conditions of subsequent maintenance and the like.
The type and storage space of the storage unit 50 are not limited in this application, and the first storage sub-unit and the second storage sub-unit include at least one of a TF storage card with a model number of SDSQUNC-032G-ZN3MN, a usb disk, a hard disk, or other memories, and the storage types and storage spaces of the first storage sub-unit and the second storage sub-unit may be the same or different.
The structure of the data preprocessing unit 20 and the chip used by the processor are not limited in the application, and a worker can select a proper processor according to the requirements of processing speed and the like, wherein the data preprocessing unit 20 comprises at least one of an ARM processor chip with the model of EPX10, a 51-series single chip microcomputer or other types of chips.
In this application, the unit is used for collecting voltage and current data in real time, and the data can be collected respectively or simultaneously, and generally independently reach each other to ensure the collection accuracy, in one embodiment, the sampling unit 10 includes a voltage transformer and a current transformer, and is used for detecting three-phase current and voltage of a power grid side and a transformer side in real time.
The precision, the structure and the like of the voltage transformer and the current transformer are not limited.
To ensure data processing efficiency, in one embodiment, the data processing unit 30 includes a model DSP TMS320F28335 processor chip.
The present application includes, but is not limited to, the DSP TMS320F28335 processor chip, and other DSP chips, or the like, may also be used.
In order to improve the timeliness of maintenance due to the possibility of equipment failure during operation, in one embodiment, the transformer grouping closing device based on real-time magnetic flux error estimation further includes a status indicator lamp connected to the isolated phase closing unit 40, and configured to issue an indication warning after the isolated phase closing unit 40 outputs the three-phase breaker switch control command to perform control operation on the relay for a predetermined time period.
Through the status indicator lamp, the alarm is given after the time length exceeding is the time length for operating the relay, so that maintenance personnel can be quickly informed to quickly maintain, and the maintenance efficiency is improved.
Since remote data control or data acquisition is required during operation, possibly due to data parameter errors and the like, or other unexpected situations and the like, in one embodiment, the transformer packet closing apparatus based on real-time magnetic flux error estimation further includes a communication module connected to the isolated phase closing unit 40, and configured to output the three-phase breaker switch control command or receive the control command.
The structure of the communication module and the like are not limited, and the communication module can be a 4F module, a 5G module, a WIFI module and the like.
According to the transformer split-phase closing device based on the real-time magnetic flux error estimation, the split-phase closing unit 40 controls the three-phase circuit breaker through the relay equipment according to the switching command signal sent by the data processing unit 30, and selects a specific phase angle split phase to switch so as to thoroughly eliminate the magnetizing inrush current generated by the transformer.
The excitation inrush current can be restrained by a transformer rapid switching-on technology by utilizing internal measures, but when the three-phase rapid switching-on of the transformer is carried out, the magnetic flux of each phase has a phase difference of 120 degrees, the switching-on of each phase at the most proper time cannot be met, and the three-phase rapid switching-on has a large inrush current. The transformer split-phase switching-on device based on the real-time magnetic flux error estimation is adopted, and the magnetizing inrush current generated by the transformer can be effectively restrained.
In summary, the transformer grouping switching-on device based on the real-time magnetic flux error estimation provided by the embodiment of the invention detects three-phase currents and voltages at the side of the power grid and the side of the transformer in real time, performs hysteresis compensation processing on a plurality of sampling signals collected by a sampling unit group, and outputs a synchronous signal after eliminating the angle deviation of the voltage transformer and the current transformer; performing feature extraction on the synchronous signals obtained from the sampling unit by adopting a genetic algorithm, calculating expected magnetic flux on the power grid side and residual magnetic flux on the transformer side as characteristic information, and outputting the characteristic information; according to the characteristic information output by the data preprocessing unit, a magnetic quantity error technology is adopted for analysis, a real-time switch control command of the transformer is analyzed and converted into a three-phase breaker switch control command for output, so that the excitation inrush current can be fundamentally and thoroughly eliminated, the running reliability of the transformer is improved, the damage to power equipment is reduced, the structure is simple, the automatic running can be realized, less equipment is added, the increase of the operating cost is very limited, and the cost-effectiveness ratio is greatly improved.
The transformer grouping and closing device based on the real-time magnetic flux error estimation provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A transformer grouping switching-on device based on real-time magnetic flux error estimation is characterized by comprising the following components:
the sampling unit is used for detecting three-phase current and voltage at the side of a power grid and the side of a transformer in real time, performing hysteresis compensation processing on a plurality of paths of sampling signals collected by the sampling unit group, and outputting synchronous signals after eliminating the angle deviation of the voltage transformer and the current transformer;
the data preprocessing unit is connected with the sampling unit, performs feature extraction on the synchronous signals obtained from the sampling unit by adopting a genetic algorithm, calculates expected magnetic flux on the side of a power grid and residual magnetic flux on the side of a transformer as characteristic information and outputs the characteristic information;
and the data processing unit is connected with the data preprocessing unit, analyzes the real-time switch control command of the transformer by adopting a magnetic error technology according to the characteristic information output by the data preprocessing unit, and converts the real-time switch control command into a three-phase breaker switch control command for output.
2. The transformer grouping and closing device based on the real-time magnetic flux error estimation as claimed in claim 1, further comprising an isolated phase closing unit connected to the data processing unit for performing corresponding control operations on the corresponding three-phase circuit breaker of the transformer through a relay according to the three-phase circuit breaker switch control command.
3. The transformer packet switching device based on real-time magnetic flux error estimation as claimed in claim 2, further comprising a storage unit connected to the data preprocessing unit and the data processing unit for storing the characteristic information and the three-phase breaker switch control command.
4. The transformer packet switching device based on real-time magnetic flux error estimation as claimed in claim 3, wherein the storage unit comprises a first storage sub-unit and a second storage sub-unit, the first storage sub-unit is used for storing the characteristic information, and the second storage sub-unit is used for storing the three-phase breaker switch control command.
5. The transformer packet switching device based on real-time magnetic flux error estimation as claimed in claim 4, wherein the first storage sub-unit and the second storage sub-unit comprise at least one of a TF memory card, a U-disk and a hard disk with a model number of SDSQUNC-032G-ZN3 MN.
6. The transformer packet switching device based on real-time magnetic flux error estimation as claimed in claim 5, wherein the data preprocessing unit comprises at least one of an ARM processor chip with model number of EPX10 and a 51-series single chip microcomputer.
7. The transformer grouping closing device based on the real-time magnetic flux error estimation as claimed in claim 6, wherein the sampling unit comprises a voltage transformer and a current transformer for detecting the three-phase current and voltage of the grid side and the transformer side in real time.
8. The transformer packet switching device based on real-time magnetic flux error estimation of claim 7, wherein the data processing unit comprises a processor chip of a model number DSP TMS320F 28335.
9. The transformer grouping closing device based on the real-time magnetic flux error estimation as claimed in claim 8, further comprising a status indicator lamp connected to the isolated phase closing unit for sending an indication warning after the isolated phase closing unit performs a control operation on the relay for outputting the three-phase breaker switch control command for a predetermined time.
10. The transformer grouping closing device based on the real-time magnetic flux error estimation as claimed in claim 9, further comprising a communication module connected to the isolated phase closing unit for outputting the three-phase breaker switch control command or receiving the control command.
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| CN202111676124.8A CN114284999B (en) | 2021-12-31 | Transformer grouping closing device based on magnetic flux error real-time estimation |
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| CN202111676124.8A CN114284999B (en) | 2021-12-31 | Transformer grouping closing device based on magnetic flux error real-time estimation |
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| CN114284999A true CN114284999A (en) | 2022-04-05 |
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