CN108469555B - Method for confirming three-phase access phase sequence of phase change switch - Google Patents
Method for confirming three-phase access phase sequence of phase change switch Download PDFInfo
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Abstract
The method comprises the following steps that the master control monitors the total current of three phases at a low-voltage side outlet A, B, C of a station area IN real time, the current phase is uploaded by the phase change unit, the OUT is equal to IN1, the master control issues a phase change instruction, the OUT is changed to IN2 and IN 1-IN 2, the change amount of the characteristic quantity of the total output current of the three phases IN the phase change process of the phase change unit is △ IA, △ IB and △ IC, the corresponding correspondence of the Min △ IA and the Delta and lTtTtTtTtransfer = "," (gTtTtTtTtTtTtTtTtTtTtransfer "") corresponds to 1, the { △ transfer "&" "," TtTtTtTtTtTtTtTtTgTtTtTtTgTtIC } IC } corresponds to the current of the master control unit, the current distribution of the phase change unit is not matched with the current of the current distribution of the master control unit, the current distribution of the phase change unit, and the current distribution of the phase change unit is matched with the current distribution of the master control unit.
Description
The technical field is as follows:
the invention relates to the treatment of three-phase unbalance of a low-voltage circuit, and further relates to a method for confirming a three-phase access phase sequence of a phase change switch.
Background art:
in the existing three-phase unbalance treatment scheme of a low-voltage distribution area, a scheme of using a phase change switch is an ideal solution. The scheme can essentially solve the problem of unbalanced three-phase load of the line, not only the product has low running loss, stable running and long service life, but also the whole line loss can be reduced, and economic benefits are generated. An important problem to be solved in the scheme of solving three-phase unbalance of a transformer area by using the phase change switch is the determination of the phase sequence. The technical principle of the commutation switch is that a single-phase load is switched from a heavy-load line to a light-load line, so that the overall unbalance degree of an A-B-C three-phase load is reduced, and before a main control sends a commutation instruction to a commutation unit, the access phase sequence of three-phase input of the commutation unit needs to be known. Theoretically, all the phase change units are connected according to the A-B-C standard phase sequence, the problem does not exist, but the low-voltage distribution line is complicated, the three-phase branch line is frequently and manually reversed, the phase change units need to be connected with the fixed phase sequence, time and labor are wasted, and the phase sequence cannot be reliably maintained, and therefore the phase sequence needs to be automatically confirmed through technical means.
The traditional phase sequence confirmation method strictly requires access according to a standard phase sequence during installation, or additionally adds a hardware communication means for phase confirmation. The first approach is time consuming, labor intensive and error prone, and the second approach adds significant cost and fails to confirm phase sequence once the communication channel fails.
As a key technology in a commutation switch product, phase sequence confirmation is a necessary function, some other manufacturers confirm a phase by adding a carrier communication module at present, some identify the phase by taking zero-crossing point time deviation of three phases as a reference and an accurate time calibration means, some factory specifications need to be accessed according to a standard phase, and otherwise, the phase is self-negative.
The method for confirming the phase by carrier communication needs to install a three-phase carrier module at the main control, install a single-phase carrier module at the commutation unit, determine the phase of the current output access of the commutation unit by carrier communication, and then determine the phase sequence of the three-phase access by the change of the output position. The cost is obviously increased, and the carrier communication itself has instability and is easily interfered.
The method for confirming the three-phase by the three-phase zero crossing point time deviation comprises the steps that firstly, the main control phase changing unit and the phase changing unit have relatively accurate clocks, and the clocks of the main control phase changing unit and the phase changing unit are also synchronous. The method of the second order needs to use communication to calibrate the clock frequently, the commutation unit needs to test accurately with the communication delay of the master control, and must be stable in the working process, and its realization difficulty and complexity are higher, and need to be equipped with accurate clock module.
The invention content is as follows:
the phase sequence confirmation method for the commutation unit does not need to add extra hardware equipment, and is simple, feasible, high in accuracy and high in adaptability. The specific technical scheme is as follows:
when the load of the phase change unit is an electric device, the method for confirming the three-phase access phase sequence of the phase change switch is characterized IN that three inputs accessed by the phase change unit are named as IN1, IN2 and IN3 IN sequence, the output is named as OUT, and the current output OUT is named as IN1, and the method comprises the following steps:
the phase change switch monitors the total current of the three phases of the outlet A, B, C at the low-voltage side of the transformer area in real time;
step 1: the commutation unit uploads the current phase, OUT ═ IN 1;
step 2, a phase change instruction is issued by a master controller, OUT is changed to IN2 and IN 1- > IN2, the change amount of the total current of each of three phases IN the phase change process of a phase change unit is △ IA, △ IB and △ IC, △ IA is the A-phase current characteristic quantity after the phase change minus the A-phase current characteristic quantity before the phase change, △ IB is the B-phase current characteristic quantity after the phase change minus the B-phase current characteristic quantity before the phase change, △ IC is the C-phase current characteristic quantity after the phase change minus the C-phase current characteristic quantity before the phase change, △ IA, and the value of [ gtttt translation = "&/Tt/gttt/t &" = gttt IC is positive or negative;
step 3. the correspondence of Min { △ IA, &lTtTtransformation = delta "&tttdelta &lTt/T &tttIB, &lTtTtransformation = delta" &tttdelta <tt/T gtt gTt IC } corresponds to IN1, the correspondence of Min { △ IA, &lTtTtransformation & &1 delta "&ttttransformation &delta" &gTt/T gtt gTt IB, &lTtTtransformation "&" delta &Δ &l &/T &tttgTt IC } corresponds to IN2, and the remaining correspondences correspond to IN 3.
The preferable scheme also comprises the following steps:
and 4, step 4: repeating the step 1-3 for N times, wherein N is more than or equal to 3, and if the phase sequence of each time is the same, finishing the confirmation; if not, the validation is restarted until N consecutive equalities are met.
When the load of the commutation unit is a power generation device, the method for confirming the three-phase access phase sequence of the commutation switch has the following procedures that three inputs accessed by the commutation unit are named as IN1, IN2 and IN3 IN sequence, the output is named as OUT, and the current output OUT is equal to IN 1:
the phase change switch monitors the total current of the three phases of the outlet A, B, C at the low-voltage side of the transformer area in real time;
step 1: the commutation unit uploads the current phase, OUT ═ IN 1;
step 2, a phase change instruction is issued by a master controller, OUT is changed to IN2 and IN 1- > IN2, the change amount of the total current of each of three phases IN the phase change process of a phase change unit is △ IA, △ IB and △ IC, △ IA is the A-phase current characteristic quantity after the phase change minus the A-phase current characteristic quantity before the phase change, △ IB is the B-phase current characteristic quantity after the phase change minus the B-phase current characteristic quantity before the phase change, △ IC is the C-phase current characteristic quantity after the phase change minus the C-phase current characteristic quantity before the phase change, △ IA, and the value of [ gtttt translation = "&/Tt/gttt/t &" = gttt IC is positive or negative;
step 3, the correspondence corresponding to Max { △ IA, &ttttranslation = delta "&tttΔ &ttt/t &tttib, <tttranslation = delta" &tttΔ &ttt/t &tttgtt IC } corresponds to IN1, the correspondence corresponding to Min { △ IA, <tttranslation & "&ttttranslation &Δ" &ttt/t &tttib, &ttttranslation "&" delta &tttΔ &/t &tttgtt IC } corresponds to IN2, and the remaining correspondences correspond to IN 3.
The preferable scheme also comprises the following steps:
and 4, step 4: repeating the step 1-3 for N times, wherein N is more than or equal to 3, and if the phase sequence of each time is the same, finishing the confirmation; if not, the validation is restarted until N consecutive equalities are met.
The total current of the three phases of the low-voltage side outlet A, B, C of the transformer area is detected in real time through a current transformer.
Compared with the prior art, the invention has the advantages that:
the phase sequence confirming method does not need to add extra hardware configuration, is simple in realization principle, only needs the master control to monitor the total outlet current, and the current transformer for master control measurement belongs to basic configuration.
The method has the error correction function, and can start the phase sequence identification function module to confirm the current phase sequence again in the phase change working process of the phase change unit.
And thirdly, the phase sequence can be permanently stored in the main control after being identified, and the phase sequence does not need to be judged again after power failure and restart.
And (IV) the judgment of the method is not sensitive to the harmonic content of the load, and the judgment result cannot be interfered due to the high harmonic content.
The method is realized by a pure software algorithm, has low cost, can be realized as long as equipment can complete phase change, and cannot increase the failure rate of the equipment.
Description of the drawings:
FIG. 1 is a schematic diagram of the wiring structure of the present invention.
The specific implementation mode is as follows:
example (b):
when the load of the phase change unit is an electric device, the method for confirming the three-phase access phase sequence of the phase change switch is characterized IN that three inputs accessed by the phase change unit are named as IN1, IN2 and IN3 IN sequence, the output is named as OUT, and the current output OUT is named as IN1, and the method comprises the following steps:
the phase change switch monitors the total current of the three phases of the outlet A, B, C at the low-voltage side of the transformer area in real time;
step 1: the commutation cell uploads the current phase, e.g., OUT — IN 1;
step 2, a phase change instruction is issued by a master controller, OUT is changed to IN2, namely IN 1- > IN2, the change amount of the total current of each of three phases IN the phase change process of a phase change unit is △ IA, △ IB and △ IC, △ IA is the A-phase current characteristic quantity after the phase change minus the A-phase current characteristic quantity before the phase change, △ IB is the B-phase current characteristic quantity after the phase change minus the B-phase current characteristic quantity before the phase change, △ IC is the C-phase current characteristic quantity after the phase change minus the C-phase current characteristic quantity before the phase change, △ IA, and the value of [ gtttt translation = "&/Tt/gttt/t &" = gttt IC is positive or negative;
step 3. the correspondence of Min { △ IA, &lTtTtransformation = delta "&tttdelta &lTt/T &tttIB, &lTtTtransformation = delta" &tttdelta <tt/T gtt gTt IC } corresponds to IN1, the correspondence of Min { △ IA, &lTtTtransformation & &1 delta "&ttttransformation &delta" &gTt/T gtt gTt IB, &lTtTtransformation "&" delta &Δ &l &/T &tttgTt IC } corresponds to IN2, and the remaining correspondences correspond to IN 3.
The preferable scheme also comprises the following steps:
and 4, step 4: repeating the step 1-3 for N times, wherein N is more than or equal to 3, and if the phase sequence of each time is the same, finishing the confirmation; if not, the validation is restarted until N consecutive equalities are met.
When the load of the commutation unit is a power generation device, the method for confirming the three-phase access phase sequence of the commutation switch has the following procedures that three inputs accessed by the commutation unit are named as IN1, IN2 and IN3 IN sequence, the output is named as OUT, and the current output OUT is equal to IN 1:
the phase change switch monitors the total current of the three phases of the outlet A, B, C at the low-voltage side of the transformer area in real time;
step 1: the commutation unit uploads the current phase, OUT ═ IN 1;
step 2, a phase change instruction is issued by a master controller, OUT is changed to IN2, namely IN 1- > IN2, the change amount of the total current of each of three phases IN the phase change process of a phase change unit is △ IA, △ IB and △ IC, △ IA is the A-phase current characteristic quantity after the phase change minus the A-phase current characteristic quantity before the phase change, △ IB is the B-phase current characteristic quantity after the phase change minus the B-phase current characteristic quantity before the phase change, △ IC is the C-phase current characteristic quantity after the phase change minus the C-phase current characteristic quantity before the phase change, △ IA, and the value of [ gtttt translation = "&/Tt/gttt/t &" = gttt IC is positive or negative;
step 3, the correspondence corresponding to Max { △ IA, &ttttranslation = delta "&tttΔ &ttt/t &tttib, <tttranslation = delta" &tttΔ &ttt/t &tttgtt IC } corresponds to IN1, the correspondence corresponding to Min { △ IA, <tttranslation & "&ttttranslation &Δ" &ttt/t &tttib, &ttttranslation "&" delta &tttΔ &/t &tttgtt IC } corresponds to IN2, and the remaining correspondences correspond to IN 3.
The preferable scheme also comprises the following steps:
and 4, step 4: repeating the step 1-3 for N times, wherein N is more than or equal to 3, and if the phase sequence of each time is the same, finishing the confirmation; if not, the validation is restarted until N consecutive equalities are met.
The total current of the three phases of the low-voltage side outlet A, B, C of the transformer area is detected in real time through a current transformer.
And the main control unit stores the phase sequence into a Flash chip, and enters an automatic operation mode after all the phase change units complete phase confirmation.
Claims (5)
1. The method for confirming the three-phase access phase sequence of the phase change switch is characterized IN that a phase change unit load is an electric device, three input ends accessed by the phase change unit are sequentially named as IN1, IN2 and IN3, an output end is named as OUT, and the current output OUT is equal to IN1, and the method comprises the following steps:
the phase change switch monitors the total current of the three phases of the outlet A, B, C at the low-voltage side of the transformer area in real time;
step 1: the commutation unit uploads the current phase, OUT ═ IN 1;
step 2, a phase change instruction is issued by a master controller, OUT is changed to IN2, namely IN 1- > IN2, the change amount of the total current of each of three phases IN the phase change process of a phase change unit is △ IA, △ IB and △ IC, △ IA is the A-phase current characteristic quantity after the phase change minus the A-phase current characteristic quantity before the phase change, △ IB is the B-phase current characteristic quantity after the phase change minus the B-phase current characteristic quantity before the phase change, △ IC is the C-phase current characteristic quantity after the phase change minus the C-phase current characteristic quantity before the phase change, △ IA, and the value of [ gtttt translation = "&/Tt/gttt/t &" = gttt IC is positive or negative;
step 3. the correspondence of Min { △ IA, &lTtTtransformation = delta "&tttdelta &lTt/T &tttIB, &lTtTtransformation = delta" &tttdelta <tt/T gtt gTt IC } corresponds to IN1, the correspondence of Min { △ IA, &lTtTtransformation & &1 delta "&ttttransformation &delta" &gTt/T gtt gTt IB, &lTtTtransformation "&" delta &Δ &l &/T &tttgTt IC } corresponds to IN2, and the remaining correspondences correspond to IN 3.
2. The method for confirming the three-phase access phase sequence of the phase change switch according to claim 1, further comprising the following steps:
and 4, step 4: repeating the step 1-3 for N times, wherein N is more than or equal to 3, and if the phase sequence of each time is the same, finishing the confirmation; if not, the validation is restarted until N consecutive equalities are met.
3. The method for confirming the three-phase access phase sequence of the commutation switch is characterized IN that a commutation unit load is a power generation device, three input ends accessed by the commutation unit are sequentially named as IN1, IN2 and IN3, an output end is named as OUT, and the current output OUT is equal to IN1, and the method comprises the following steps:
the phase change switch monitors the total current of the three phases of the outlet A, B, C at the low-voltage side of the transformer area in real time;
step 1: the commutation unit uploads the current phase, OUT ═ IN 1;
step 2, a phase change instruction is issued by a master controller, OUT is changed to IN2, namely IN 1- > IN2, the change amount of the total current of each of three phases IN the phase change process of a phase change unit is △ IA, △ IB and △ IC, △ IA is the A-phase current characteristic quantity after the phase change minus the A-phase current characteristic quantity before the phase change, △ IB is the B-phase current characteristic quantity after the phase change minus the B-phase current characteristic quantity before the phase change, △ IC is the C-phase current characteristic quantity after the phase change minus the C-phase current characteristic quantity before the phase change, △ IA, and the value of [ gtttt translation = "&/Tt/gttt/t &" = gttt IC is positive or negative;
step 3, the correspondence corresponding to Max { △ IA, &ttttranslation = delta "&tttΔ &ttt/t &tttib, <tttranslation = delta" &tttΔ &ttt/t &tttgtt IC } corresponds to IN1, the correspondence corresponding to Min { △ IA, <tttranslation & "&ttttranslation &Δ" &ttt/t &tttib, &ttttranslation "&" delta &tttΔ &/t &tttgtt IC } corresponds to IN2, and the remaining correspondences correspond to IN 3.
4. The method for confirming the three-phase access phase sequence of the phase change switch according to claim 3, further comprising the following steps:
and 4, step 4: repeating the step 1-3 for N times, wherein N is more than or equal to 3, and if the phase sequence of each time is the same, finishing the confirmation; if not, the validation is restarted until N consecutive equalities are met.
5. The method for confirming the three-phase access phase sequence of the phase change switch according to any one of claims 1 to 4, wherein the total current of each of the three phases of the low-voltage side outlet A, B, C of the platform area is detected in real time through a current transformer.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007093493A (en) * | 2005-09-30 | 2007-04-12 | Hioki Ee Corp | Ground phase specifying device |
| CN204243777U (en) * | 2014-12-25 | 2015-04-01 | 武汉华大鄂电电气设备有限公司 | Carry the phase-change switch of phase sequence recognition function |
| CN106597133A (en) * | 2016-12-15 | 2017-04-26 | 福州大学 | Method and device for recognition and identification of low-voltage power grid single-phase line phase sequence |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007093493A (en) * | 2005-09-30 | 2007-04-12 | Hioki Ee Corp | Ground phase specifying device |
| CN204243777U (en) * | 2014-12-25 | 2015-04-01 | 武汉华大鄂电电气设备有限公司 | Carry the phase-change switch of phase sequence recognition function |
| CN106597133A (en) * | 2016-12-15 | 2017-04-26 | 福州大学 | Method and device for recognition and identification of low-voltage power grid single-phase line phase sequence |
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