CN107634527B - Regulation system for treating three-phase imbalance of distribution transformer area - Google Patents
Regulation system for treating three-phase imbalance of distribution transformer area Download PDFInfo
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- 238000004891 communication Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses an adjusting system for treating three-phase imbalance of a distribution transformer area, which comprises the following components: the system comprises a data acquisition module, a main controller, a single-phase load phase-change extension machine and a three-phase load phase-change extension machine; the main controller is respectively connected with the single-phase load phase-shifting extension and the three-phase load phase-shifting extension and is used for respectively controlling the single-phase load phase-shifting extension to shift the single-phase current of the single-phase load and the three-phase load phase-shifting extension to switch and adjust the three-phase current of the three-phase load among A phase, B phase and C phase according to the unbalance of the three-phase current of the low-voltage side bus and the unbalance of the three-phase current of each branch bus, which are acquired by the data acquisition module. By arranging the single-phase load phase-change extension machine and the three-phase load phase-change extension machine to be matched and adjusted, the three-phase unbalance of the currents of the A phase, the B phase and the C phase of the low-voltage side bus and the three-phase unbalance of the currents of the A phase, the B phase and the C phase of each branch bus are reduced.
Description
Technical Field
The invention relates to the technical field of power distribution transformer low-voltage load distribution, in particular to an adjusting system for treating three-phase imbalance of a distribution transformer area.
Background
End users of low voltage distribution transformer power systems contain a large number of single phase loads and three phase loads, especially commercial and civil facilities such as air conditioners, computers, electric water heaters, refrigerators, lighting and various household appliances, etc., and the number of the end users is increased, the power is increased, and the dynamic unbalance of the three phase loads is increased due to the seasonal and randomness of electricity consumption.
When the three-phase loads are balanced, the three-phase currents are equal, and the vector sum on the neutral lines of the three-phase loads is zero because of 120 degrees of phase angle difference of fundamental waves, so that no current passes through the neutral lines. The neutral line current is shunted in each phase winding of the distribution transformer by current components with the same size and direction at the neutral point, which is called zero sequence current, when the three-phase load is seriously unbalanced, the distribution transformer can generate larger zero sequence current, the zero sequence current flows in the distribution transformer to generate zero sequence magnetic flux, the zero sequence magnetic flux passes through an iron core, a metal shell, a radiating pipe and the like of the transformer to form a loop, the zero sequence magnetic flux cuts a metal component of the transformer to generate induced potential, and forms current in a metal conductor, namely vortex, and the vortex flows in the metal conductor of the transformer to generate heat, namely vortex loss, so that the transformer loss is increased, the power factor is reduced, and the safe operation of the transformer is endangered seriously.
The dynamic unbalance of the three-phase load causes serious damage to the power system, the dynamic unbalance of the three-phase load can cause the increase of line loss, the generation of additional iron loss and voltage deviation of the transformer, the generation of additional copper loss of the power system, the increase of the additional copper loss can cause the heating of the transformer, and the operation efficiency of the transformer is reduced.
In the prior art, the problem of unbalanced three-phase load only relates to the problem of three-phase balance adjustment of single-phase load, and as the three-phase load increases, the adjustment result precision is lower as the adjustment is carried out only from the single-phase load.
Therefore, there is a need for a system for controlling three-phase imbalance in a distribution transformer area that reduces the imbalance of three-phase loads.
Disclosure of Invention
The invention aims to provide a three-phase unbalance regulating system for a distribution transformer area, which can reduce the three-phase load unbalance.
In order to achieve the above object, the present invention provides the following solutions:
an adjustment system for managing three-phase imbalance of a distribution transformer area, the adjustment system comprising: the system comprises a data acquisition module, a main controller, a single-phase load phase-change extension machine and a three-phase load phase-change extension machine;
the data acquisition module is connected with the main controller, is arranged on a low-voltage side bus and each branch bus of a transformer in the power distribution system, and is used for monitoring currents of the A phase, the B phase and the C phase of the low-voltage side bus and currents of the A phase, the B phase and the C phase of each branch bus in real time and transmitting the currents to the main controller;
the single-phase load phase-shifting extension is arranged at the front side of a terminal user table of the single-phase load and is used for shifting the phase of the single-phase current of the single-phase load;
the three-phase load phase-change extension is arranged at the front side of a terminal user meter of the three-phase load and is used for switching and adjusting the three-phase current of the three-phase load among A phase, B phase and C phase;
the main controller is respectively connected with the single-phase load phase-change extension machine and the three-phase load phase-change extension machine and is used for respectively controlling the single-phase load phase-change extension machine to shift the single-phase current of the single-phase load and the three-phase load phase-change extension machine to switch and adjust the three-phase current of the three-phase load among A phase, B phase and C phase according to the unbalance degree of the three-phase current of the low-voltage side bus and the unbalance degree of the three-phase current of each branch bus.
Optionally, the single-phase load phase-change extension specifically includes: the single-phase load phase-change composite switch comprises a single-phase current acquisition unit, a single-phase control unit and a single-phase load phase-change composite switch;
the single-phase current acquisition unit is connected with the single-phase control unit, is arranged at the front side of the end user meter of the single-phase load, and is used for acquiring the single-phase current of the access end of the single-phase load in real time and sending the single-phase current to the single-phase control unit;
the single-phase load phase-change composite switch is connected with the single-phase control unit and is used for phase-shifting the single-phase current;
the single-phase control unit is connected with the main controller, and the main controller sends out a control signal and sends the control signal to the single-phase control unit.
Optionally, the three-phase load phase-change extension specifically includes: the three-phase load phase-change composite switch comprises a three-phase current acquisition unit, a three-phase control unit and a three-phase load phase-change composite switch;
the three-phase current acquisition unit is connected with the three-phase control unit, is arranged at the front side of the end user meter of the three-phase load, and is used for acquiring the three-phase current of the access end of the three-phase load in real time and sending the three-phase current to the three-phase control unit;
the three-phase load phase-change compound switch is connected with the three-phase control unit and is used for switching and adjusting the three-phase current among A phase, B phase and C phase;
the three-phase control unit is connected with the main controller, and the main controller sends out control signals and sends the control signals to the three-phase control unit.
Optionally, the adjusting system further comprises: and the display module is connected with the main controller and is used for displaying the single-phase current of the single-phase load and the three-phase current of the three-phase load.
Optionally, the adjusting system further comprises: a single-phase communication unit, a three-phase communication unit;
the single-phase communication unit is respectively connected with the single-phase control unit and the main controller and is used for transmitting single-phase current signals in the single-phase control unit to the main controller;
the three-phase communication unit is respectively connected with the three-phase control unit and the main controller and is used for transmitting three-phase current signals in the three-phase control unit to the main controller.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention discloses a regulating system for managing three-phase unbalance of a distribution transformer area, which can reduce the three-phase load unbalance, wherein a data acquisition module monitors the currents of A phase, B phase and C phase of a low-voltage side bus and the currents of A phase, B phase and C phase of each branch bus in real time, and a main controller controls a single-phase load phase-changing machine to shift the single-phase current according to the three-phase unbalance of the currents of A phase, B phase and C phase of the low-voltage side bus and the current three-phase unbalance of A phase, B phase and C phase of each branch bus, and is also used for controlling the three-phase load phase-changing machine to switch and regulate the three-phase current among the A phase, B phase and C phase, and the single-phase load phase-changing machine and the three-phase load phase-changing machine are matched and regulated, so that the three-phase unbalance of the currents of A phase, B phase and C phase of the low-voltage side bus and the current three-phase unbalance of the A phase, B phase and C phase of each branch bus are reduced.
The problem that balance adjustment is difficult to realize in the distribution transformer area with more three-phase loads is effectively solved, meanwhile, the problem of electric power waste caused by serious unbalance of the low-voltage distribution transformer is solved, and the operation efficiency and the service life of the low-voltage distribution transformer system are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a structural topology of a power distribution system;
FIG. 2 is a block diagram of the structure of a system for controlling three-phase imbalance in a distribution transformer area according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a three-phase unbalance regulating system for a distribution transformer area, which can reduce the three-phase load unbalance.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in a topological diagram of a power distribution system in fig. 1, in the invention, a host 3 of the regulation system is arranged on a low-voltage side 2 of a distribution transformer area 1, a branch bus 4, a three-phase load 5 and a single-phase load 6 are arranged on branch lines, and as shown in fig. 2, the host 3 comprises a data acquisition module 7, a main controller 8 and a display module 9.
As shown in fig. 2, an adjusting system for managing three-phase imbalance of a distribution transformer area, the adjusting system includes: the system comprises a data acquisition module 7, a main controller 8, a single-phase load phase-change extension 13 and a three-phase load phase-change extension 12.
The data acquisition module 7 is connected with the main controller 8, and is arranged on the low-voltage side 2 bus and each branch bus 4 of the transformer in the power distribution system 1, the three phases of the low-voltage side 2 bus are respectively an A phase, a B phase and a C phase, and the data acquisition module 7 is used for monitoring the currents of the A phase, the B phase and the C phase of the low-voltage side 2 bus and the currents of the A phase, the B phase and the C phase of each branch bus 4 in real time and sending the currents to the main controller 8.
The single-phase load phase-shifting extension 13 is arranged at the front side of an end user table of the single-phase load and is used for shifting the phase of the single-phase current of the single-phase load; the three-phase load phase change extension 12 is arranged at the front side of an end user table of the three-phase load and is used for switching and adjusting the three-phase current of the three-phase load among phases A, B and C.
As shown in fig. 2, the main controller 8 is connected to the single-phase load phase-change sub-unit 13 and the three-phase load phase-change sub-unit 12, and is configured to control the single-phase load phase-change sub-unit 13 to switch and adjust the single-phase current of the single-phase load between phases a, B, and C according to the unbalance of the three-phase current of the low-voltage side 2 bus and the unbalance of the three-phase current of each branch bus 4, respectively, and the main controller 8 sets a threshold value of the unbalance of the three-phase current, and when the unbalance of the three-phase current of the low-voltage side 2 bus and the unbalance of the three-phase current of each branch bus 4 exceed the threshold value of the unbalance, the main controller 8 controls the single-phase load phase-change sub-unit 13 to switch and the three-phase load sub-unit 12 to switch and adjust the three-phase current of the three-phase load between phases a, B, and C so that the unbalance of the three-phase current of the low-voltage side 2 bus and the unbalance of each branch bus 4 remain within the threshold value of the unbalance of the three-phase current of the three-phase load within the range of the three-phase bus.
As shown in fig. 2, the single-phase load commutation extension 13 specifically includes: a single-phase current acquisition unit 14, a single-phase control unit 15 and a single-phase load commutation compound switch 16.
The single-phase current collection unit 14 is connected to the single-phase control unit 15, and is disposed at a front side of an end user table of the single-phase load 6, and is configured to collect a single-phase current of an access terminal of the single-phase load 6 in real time, and send the single-phase current to the single-phase control unit 15.
And a single-phase load phase-shifting composite switch 16 connected with the single-phase control unit 15 and used for shifting the phase of the single-phase current.
The single-phase control unit 15 is connected with the main controller 8, and the main controller 8 sends out a control signal and sends the control signal to the single-phase control unit 15.
As shown in fig. 2, the three-phase load commutation extension 12 specifically includes: a three-phase current acquisition unit 19, a three-phase control unit 18 and a three-phase load phase-change compound switch 17.
The three-phase current collection unit 19 is connected to the three-phase control unit 18, and is disposed at a front side of an end user meter of the three-phase load 5, and is configured to collect three-phase currents of an access terminal of the three-phase load 5 in real time, and send the three-phase currents to the three-phase control unit 18.
And the three-phase load phase-change composite switch 17 is connected with the three-phase control unit 18 and is used for switching and adjusting the three-phase current among A phase, B phase and C phase.
The three-phase control unit 18 is connected with the main controller 8, and the main controller 8 sends out a control signal and sends the control signal to the three-phase control unit 18.
As shown in fig. 2, the adjustment system further includes: and the display module 9 is connected with the main controller 8 and is used for displaying the single-phase current of the single-phase load 6 and the three-phase current of the three-phase load 5.
As shown in fig. 2, the adjustment system further includes: a single-phase communication unit 10, a three-phase communication unit 11;
the single-phase communication unit 10 is respectively connected with the single-phase control unit 15 and the main controller 8, and is used for transmitting a single-phase current signal in the single-phase control unit 15 to the main controller 8; the three-phase communication unit 11 is respectively connected with the three-phase control unit 18 and the main controller 8, and is used for transmitting three-phase current signals in the three-phase control unit 18 to the main controller 8.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (3)
1. An adjustment system for managing three-phase imbalance of a distribution transformer area, the adjustment system comprising: the system comprises a data acquisition module, a main controller, a single-phase load phase-change extension machine and a three-phase load phase-change extension machine;
the data acquisition module is connected with the main controller, is arranged on a low-voltage side bus and each branch bus of a transformer in the power distribution system, and is used for monitoring currents of the A phase, the B phase and the C phase of the low-voltage side bus and currents of the A phase, the B phase and the C phase of each branch bus in real time and transmitting the currents to the main controller;
the single-phase load phase-shifting extension is arranged at the front side of a terminal user table of the single-phase load and is used for shifting the phase of the single-phase current of the single-phase load;
the three-phase load phase-change extension is arranged at the front side of a terminal user meter of the three-phase load and is used for switching and adjusting the three-phase current of the three-phase load among A phase, B phase and C phase;
the main controller is respectively connected with the single-phase load phase-change extension machine and the three-phase load phase-change extension machine and is used for respectively controlling the single-phase load phase-change extension machine to shift the single-phase current of the single-phase load and the three-phase load phase-change extension machine to switch and adjust the three-phase current of the three-phase load among A phase, B phase and C phase according to the unbalance degree of the three-phase current of the low-voltage side bus and the unbalance degree of the three-phase current of each branch bus;
the three-phase load phase change extension specifically includes: the three-phase load phase-change composite switch comprises a three-phase current acquisition unit, a three-phase control unit and a three-phase load phase-change composite switch;
the three-phase current acquisition unit is connected with the three-phase control unit, is arranged at the front side of the end user meter of the three-phase load, and is used for acquiring the three-phase current of the access end of the three-phase load in real time and sending the three-phase current to the three-phase control unit;
the three-phase load phase-change compound switch is connected with the three-phase control unit and is used for switching and adjusting the three-phase current among A phase, B phase and C phase;
the three-phase control unit is connected with the main controller, and the main controller sends out a control signal and sends the control signal to the three-phase control unit;
the regulation system further comprises: and the display module is connected with the main controller and is used for displaying the single-phase current of the single-phase load and the three-phase current of the three-phase load.
2. The regulation system for managing three-phase imbalance of a distribution transformer area according to claim 1, wherein the single-phase load phase-change extension specifically comprises: the single-phase load phase-change composite switch comprises a single-phase current acquisition unit, a single-phase control unit and a single-phase load phase-change composite switch;
the single-phase current acquisition unit is connected with the single-phase control unit, is arranged at the front side of the end user meter of the single-phase load, and is used for acquiring the single-phase current of the access end of the single-phase load in real time and sending the single-phase current to the single-phase control unit;
the single-phase load phase-change composite switch is connected with the single-phase control unit and is used for phase-shifting the single-phase current;
the single-phase control unit is connected with the main controller, and the main controller sends out a control signal and sends the control signal to the single-phase control unit.
3. An adjustment system for managing three-phase imbalance in a distribution transformer area according to claim 2, further comprising: a single-phase communication unit, a three-phase communication unit;
the single-phase communication unit is respectively connected with the single-phase control unit and the main controller and is used for transmitting single-phase current signals in the single-phase control unit to the main controller;
the three-phase communication unit is respectively connected with the three-phase control unit and the main controller and is used for transmitting three-phase current signals in the three-phase control unit to the main controller.
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| CN201711098511.1A CN107634527B (en) | 2017-11-09 | 2017-11-09 | Regulation system for treating three-phase imbalance of distribution transformer area |
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| CN201711098511.1A CN107634527B (en) | 2017-11-09 | 2017-11-09 | Regulation system for treating three-phase imbalance of distribution transformer area |
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| CN107634527B true CN107634527B (en) | 2024-03-19 |
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| CN111130129B (en) * | 2018-06-07 | 2021-03-02 | 安徽南瑞中天电力电子有限公司 | Multifunctional automatic phase-changing system for medium and low voltage line |
| CN109245126B (en) * | 2018-09-07 | 2024-05-07 | 中气电力装备有限公司 | Three-phase alternating current automatic voltage regulating device and regulating method |
| CN109842136B (en) * | 2019-03-05 | 2023-04-11 | 珠海万力达电气自动化有限公司 | Three-phase unbalanced commutation system and commutation method thereof |
| CN109900996A (en) * | 2019-04-10 | 2019-06-18 | 浙江蓝嘉电力科技有限公司 | A kind of simulating grid high power three-phase imbalance adjusts and controlling device |
| CN110323765A (en) * | 2019-06-10 | 2019-10-11 | 国电南瑞南京控制***有限公司 | A kind of distribution transformer optimization progress control method and system |
| CN111880017A (en) * | 2020-07-02 | 2020-11-03 | 国网天津市电力公司 | Three-phase unbalance management test system and test method for power distribution area |
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