CN111880017A - Three-phase unbalance management test system and test method for power distribution area - Google Patents
Three-phase unbalance management test system and test method for power distribution area Download PDFInfo
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- CN111880017A CN111880017A CN202010626299.7A CN202010626299A CN111880017A CN 111880017 A CN111880017 A CN 111880017A CN 202010626299 A CN202010626299 A CN 202010626299A CN 111880017 A CN111880017 A CN 111880017A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention belongs to the technical field of power equipment, in particular to a three-phase unbalance treatment test system and a test method thereof in a power distribution area, wherein the test system comprises a three-phase power supply, a CT (current transformer) is installed in a main circuit of the three-phase power supply, a plurality of three-phase electronic loads are connected in parallel at a secondary outlet end of the three-phase power supply, and the plurality of three-phase electronic loads comprise at least one uncontrollable load and a plurality of controllable loads; and a distribution and transformation terminal is arranged at the CT position, a carrier module is arranged at each controllable load position, the carrier modules realize data intercommunication with an Ethernet switch through a serial server, and the Ethernet switch is also connected with a computer, the distribution and transformation terminal and a three-phase electronic load.
Description
Technical Field
The invention belongs to the technical field of power equipment, and particularly relates to a three-phase unbalance treatment testing system and a testing method thereof for a power distribution area.
Background
Distribution transformers supply power to low voltage loads through three phases (A, B, C), the low voltage loads are generally single-phase power supplies, and because the transformer low voltage loads are more and the size is uncontrolled, load imbalance among A, B, C three phases is easily caused, and extra power loss and other problems are brought.
In order to solve the above problems, the conventional means generally adjusts the phase change switch between A, B, C, but in the actual application process, because the low-voltage electric equipment is uncertain, the application effect of the corresponding unbalanced treatment system cannot be determined, so a test system and a test method should be designed to quantitatively test and verify the corresponding treatment system to determine the actual use effect.
Disclosure of Invention
The invention aims to make up for the defects of the prior art and provides a power distribution station three-phase imbalance treatment test system and a test method thereof, wherein the power distribution station three-phase imbalance treatment test system can simulate an imbalance treatment scene, adjust low-voltage power loads, acquire corresponding current and voltage information in real time and verify treatment effects.
The technical scheme adopted by the invention is as follows:
the utility model provides a test system is administered to unbalanced three-phase of distribution station district, includes three phase current, installs CT in this three phase current's the main road, its characterized in that: the secondary outlet end of the three-phase power supply is connected with a plurality of three-phase electronic loads in parallel, and the three-phase electronic loads comprise at least one uncontrollable load and a plurality of controllable loads; and a distribution and transformation terminal is arranged at the CT position, a carrier module is arranged at each controllable load position, the carrier modules realize data intercommunication with an Ethernet switch through a serial server, and the Ethernet switch is also connected with a computer, the distribution and transformation terminal and a three-phase electronic load.
Furthermore, the control end of the three-phase electronic load is connected with a computer, and the computer can adjust the current value of the three-phase electronic load.
Furthermore, the carrier module is connected with the distribution and transformation terminal through a serial server and can receive a phase change instruction output by the distribution and transformation terminal.
Furthermore, the serial server comprises a plurality of network ports and serial ports, and is connected with the Ethernet exchanger through the network ports and connected with the carrier module through the serial ports.
Furthermore, each carrier module is communicated with the distribution and transformation terminal, and the computer collects the data of the distribution and transformation terminal and can output a control command to the controllable load through the carrier modules.
The test method of the three-phase unbalance treatment test system applied to the power distribution area comprises the following steps:
step 1: setting load data of each three-phase electronic load;
step 2: each three-phase electronic load sends electronic load data to a distribution transformer terminal;
and step 3: the distribution and transformation terminal outputs a phase change instruction to the carrier module according to the collected overall data and the load data of the three-phase electronic load;
and 4, step 4: switching the load of the corresponding three-phase electronic load to the corresponding phase according to the phase change instruction;
and 5: changing the load data of the corresponding three-phase electronic load simultaneously with the step 4;
step 6: the distribution transformer terminal collects load data for the second time;
and 7: and comparing the load data acquired twice, and verifying the treatment effect.
The invention has the advantages and positive effects that:
in the invention, a three-phase power supply, a CT, a three-phase electronic load, a distribution and transformation terminal, a serial server and an Ethernet exchanger form a set of test system. The three-phase power supply supplies power to the three-phase electronic load through an A, B, C three-phase cable, the distribution and transformation terminal acquires three-phase current and voltage of the three-phase power supply in real time through CT to obtain load data of a simulated environment, and sends the data into the computer through a network; the three-phase electronic load is communicated with a computer to control A, B, C the load size of the three phases; the serial server realizes protocol conversion between Ethernet and a serial port; the Ethernet exchanger is respectively connected with the distribution and transformation terminal, the computer and the three-phase electronic load to realize the interaction of data and control commands.
In the invention, a set of corresponding test methods is extended based on the system. Firstly, setting load data of each three-phase electronic load to simulate a low-voltage load in an actual circuit, and sending the corresponding load data to a distribution transformer terminal for collection; the distribution transformer terminal outputs a phase change instruction to the three-phase electronic load corresponding to the overhigh load data according to the collected overall data, and simulates a phase change switch to change the phase; switching the load to a specified phase according to a corresponding instruction, and collecting load data for the second time; and comparing the acquired load data with the corresponding load data collected for the first time, and judging whether the overhigh load data is changed or not and whether the current value of the corresponding three-phase electronic load is reduced or not, thereby obtaining whether the mode and the corresponding parameters can be applied or not.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is an embodiment of the test system and test method applied.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
The invention discloses a three-phase unbalance treatment test system for a power distribution area, which comprises a three-phase power supply, wherein a main circuit of the three-phase power supply is internally provided with a CT1, the innovation of the invention is that a secondary outlet end of the three-phase power supply is connected with a plurality of three-phase electronic loads in parallel, and the plurality of three-phase electronic loads 4 comprise at least one uncontrollable load and a plurality of controllable loads; a distribution Transformation Terminal (TTU)2 is arranged at the CT position, a carrier module 3 is arranged at each controllable load position, the carrier modules realize data intercommunication with an Ethernet exchanger 6 through a serial server 5, and the Ethernet exchanger is also connected with a computer 7, the distribution Transformation Terminal (TTU) and a three-phase electronic load.
In this embodiment, the control end of the three-phase electronic load is connected to a computer, and the computer can adjust the current value of the three-phase electronic load.
In this embodiment, the carrier module is connected to the distribution Transformer Terminal (TTU) through the serial server, and can receive a commutation instruction output by the distribution Transformer Terminal (TTU).
In this embodiment, the serial server includes a plurality of network ports and serial ports, and is connected to the ethernet switch through the network ports and connected to the carrier module through the serial ports.
In this embodiment, each carrier module communicates with a distribution terminal (TTU), and the computer acquires data of the distribution terminal (TTU) and outputs a control command to the controllable load through the carrier module.
The using process of the invention is as follows:
the test method of the three-phase unbalance treatment test system applied to the power distribution area comprises the following steps:
step 1: setting load data of each three-phase electronic load;
step 2: each three-phase electronic load transmits electronic load data to a distribution Transformer Terminal (TTU);
and step 3: the distribution Transformation Terminal (TTU) outputs a phase change instruction to the carrier module according to the collected overall data and the load data of the three-phase electronic load;
and 4, step 4: switching the load of the corresponding three-phase electronic load to the corresponding phase according to the phase change instruction;
and 5: changing the load data of the corresponding three-phase electronic load simultaneously with the step 4;
step 6: a distribution Transformer Terminal (TTU) collects load data for the second time;
and 7: and comparing the load data acquired twice, and verifying the treatment effect.
The following examples were used in the present invention for simulation tests.
The number of the three-phase electronic loads is 5, and the three-phase electronic loads comprise 4 controllable loads and 1 uncontrollable load. Data for example settings are as in table 1:
| electronic load numbering | A (Ampere) | B (Ampere) | C (Ampere) |
| 1 | 14 | 0 | 0 |
| 2 | 8 | 0 | 0 |
| 3 | 0 | 0 | 9 |
| 4 | 13 | 0 | 0 |
| 5 | 14 | 28 | 29 |
| Small counter | 49 | 28 | 38 |
TABLE 1
In the step 1, the data set above is adopted as the load data of each three-phase electronic load.
In step 2, a distribution Transformer Terminal (TTU) collects the load data;
in step 3, if the load of the phase A is far greater than the loads of the phase B and the phase C, outputting a phase change instruction for the controllable load with the label of 2;
in step 4, the controllable load labeled 2 is switched from phase A to phase B;
in step 5, load data is changed due to the phase change operation in step 4;
in step 6, a distribution Transformer Terminal (TTU) collects load data for the second time, and the data is shown in a table 2;
| electronic load numbering | A (Ampere) | B (Ampere) | C (Ampere) |
| 1 | 14 | 0 | 0 |
| 2 | 0 | 8 | 0 |
| 3 | 0 | 0 | 9 |
| 4 | 13 | 0 | 0 |
| 5 | 14 | 28 | 29 |
| Small counter | 41 | 36 | 38 |
TABLE 2
In the step 7, the data in the tables 2 and 1 are compared and analyzed, and the effect of the three-phase imbalance treatment is obvious.
The experiment shows that the low-voltage load which is in the mode and meets the parameter requirement can be applied to the phase change switch of corresponding data and parameters for adjustment.
As shown in fig. 3, a distribution transformer is installed in the main path of the three-phase power supply, and a plurality of unbalanced low-voltage loads 9 are connected in parallel to the secondary outlet side of the distribution area. At some of the above-mentioned low-voltage loads, which vary considerably, phase change switches 8 are installed, which are connected in series to the load side of the power grid.
And a distribution Transformer Terminal (TTU) is arranged beside the distribution transformer and is connected with the phase change switch through a power carrier.
The commutation switch can adopt a permanent magnet relay as a commutation device.
In the invention, a three-phase power supply, a CT, a three-phase electronic load, a distribution and transformation terminal, a serial server and an Ethernet exchanger form a set of test system. The three-phase power supply supplies power to the three-phase electronic load through an A, B, C three-phase cable, the distribution and transformation terminal acquires three-phase current and voltage of the three-phase power supply in real time through CT to obtain load data of a simulated environment, and sends the data into the computer through a network; the three-phase electronic load is communicated with a computer to control A, B, C the load size of the three phases; the serial server realizes protocol conversion between Ethernet and a serial port; the Ethernet exchanger is respectively connected with the distribution and transformation terminal, the computer and the three-phase electronic load to realize the interaction of data and control commands.
In the invention, a set of corresponding test methods is extended based on the system. Firstly, setting load data of each three-phase electronic load to simulate a low-voltage load in an actual circuit, and sending the corresponding load data to a distribution transformer terminal for collection; the distribution transformer terminal outputs a phase change instruction to the three-phase electronic load corresponding to the overhigh load data according to the collected overall data, and simulates a phase change switch to change the phase; switching the load to a specified phase according to a corresponding instruction, and collecting load data for the second time; and comparing the acquired load data with the corresponding load data collected for the first time, and judging whether the overhigh load data is changed or not and whether the current value of the corresponding three-phase electronic load is reduced or not, thereby obtaining whether the mode and the corresponding parameters can be applied or not.
Claims (6)
1. The utility model provides a test system is administered to unbalanced three-phase of distribution station district, includes three phase current, installs CT in this three phase current's the main road, its characterized in that: the secondary outlet end of the three-phase power supply is connected with a plurality of three-phase electronic loads in parallel, and the three-phase electronic loads comprise at least one uncontrollable load and a plurality of controllable loads; and a distribution and transformation terminal is arranged at the CT position, a carrier module is arranged at each controllable load position, the carrier modules realize data intercommunication with an Ethernet switch through a serial server, and the Ethernet switch is also connected with a computer, the distribution and transformation terminal and a three-phase electronic load.
2. The power distribution station area three-phase unbalance treatment testing system of claim 1, wherein: the control end of the three-phase electronic load is connected with a computer, and the computer can adjust the current value of the three-phase electronic load.
3. The power distribution station area three-phase unbalance treatment testing system of claim 1, wherein: and the carrier module is connected with the distribution transformer terminal through the serial server and can receive a phase change instruction output by the distribution transformer terminal.
4. The power distribution station area three-phase unbalance treatment testing system of claim 3, wherein: the serial port server comprises a plurality of network ports and serial ports, is connected with the Ethernet exchanger through the network ports and is connected with the carrier module through the serial ports.
5. The power distribution station area three-phase unbalance treatment testing system of claim 1, wherein: each carrier module is communicated with the distribution and transformation terminal, and the computer collects the data of the distribution and transformation terminal and can output a control command to the controllable load through the carrier modules.
6. The testing method of the three-phase unbalance treatment testing system of the power distribution area according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
step 1: setting load data of each three-phase electronic load;
step 2: each three-phase electronic load sends electronic load data to a distribution transformer terminal;
and step 3: the distribution and transformation terminal outputs a phase change instruction to the carrier module according to the collected overall data and the load data of the three-phase electronic load;
and 4, step 4: switching the load of the corresponding three-phase electronic load to the corresponding phase according to the phase change instruction;
and 5: changing the load data of the corresponding three-phase electronic load simultaneously with the step 4;
step 6: the distribution transformer terminal collects load data for the second time;
and 7: and comparing the load data acquired twice, and verifying the treatment effect.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201555863U (en) * | 2009-12-25 | 2010-08-18 | 西安工程大学 | Three-phase energy-regenerating alternating current and direct current universal electronic load simulator |
| CN205720464U (en) * | 2016-04-22 | 2016-11-23 | 苏州大学 | Electronic load device |
| CN106998147A (en) * | 2017-04-20 | 2017-08-01 | 国网福建省电力有限公司 | A kind of energy-saving multifunction simulation electrical load device and its control method |
| CN206471834U (en) * | 2016-11-25 | 2017-09-05 | 江苏大航泓城电力电子有限公司 | Distribution transforming three-phase imbalance governing system |
| CN107634527A (en) * | 2017-11-09 | 2018-01-26 | 中气电力装备有限公司 | A kind of regulating system for administering distribute-electricity transformer district three-phase imbalance |
| CN109586320A (en) * | 2018-11-20 | 2019-04-05 | 广西电网有限责任公司电力科学研究院 | A kind of power distribution station load intelligent dispatching system and its load scheduling method |
-
2020
- 2020-07-02 CN CN202010626299.7A patent/CN111880017A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201555863U (en) * | 2009-12-25 | 2010-08-18 | 西安工程大学 | Three-phase energy-regenerating alternating current and direct current universal electronic load simulator |
| CN205720464U (en) * | 2016-04-22 | 2016-11-23 | 苏州大学 | Electronic load device |
| CN206471834U (en) * | 2016-11-25 | 2017-09-05 | 江苏大航泓城电力电子有限公司 | Distribution transforming three-phase imbalance governing system |
| CN106998147A (en) * | 2017-04-20 | 2017-08-01 | 国网福建省电力有限公司 | A kind of energy-saving multifunction simulation electrical load device and its control method |
| CN107634527A (en) * | 2017-11-09 | 2018-01-26 | 中气电力装备有限公司 | A kind of regulating system for administering distribute-electricity transformer district three-phase imbalance |
| CN109586320A (en) * | 2018-11-20 | 2019-04-05 | 广西电网有限责任公司电力科学研究院 | A kind of power distribution station load intelligent dispatching system and its load scheduling method |
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