CN104793675A - Contactless voltage stabilizer - Google Patents
Contactless voltage stabilizer Download PDFInfo
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- CN104793675A CN104793675A CN201410442500.0A CN201410442500A CN104793675A CN 104793675 A CN104793675 A CN 104793675A CN 201410442500 A CN201410442500 A CN 201410442500A CN 104793675 A CN104793675 A CN 104793675A
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Abstract
The invention provides a contactless voltage stabilizer to improve voltage quality for users and relates to the electric field, in particular to the field of voltage quality optimizing devices. Existing voltage stabilizers have the disadvantages that a carbon brush is prone to abrasion and needs to be replaced frequently; reaction speed is slow, and using safety of equipment is affected; three-phase integrated adjustment is adopted, and three-phase equilibrium can not be achieved. According to the contactless voltage stabilizer, silicon controlled rectifier gear shift is adopted, and a power electronic device is adopted to replace a mechanical part; carbon brush abrasion and ultrahigh or ultralow voltage at the starting moment are completely avoided structurally; a single-chip microcomputer serves as a main control chip to control a silicon controlled rectifier to be switched on and off, reaction speed is high, efficiency is high, and safety performance is high; a three-phase independent adjustment structure is adopted, and voltage of a certain phase can be adjusted independently, so that output disequilibrium caused by input disequilibrium is avoided.
Description
One, technical field
The present invention relates to power domain, particularly relate to power quality optimization device.
Two, background technology
Along with the development of science and technology, consumer grows with each passing day, but electrical power distribution facility is aging and lagging in development, and designing the brownout that the reasons such as bad and electricity shortage cause terminal temperature difference, the end of a thread user then voltage is often higher, and consumer is particularly to the strict high and new technology of voltage request and exact instrument, moment is faced with danger, and the load miscellaneous of power supply grid, can affect to electrical network itself, affect the work of load.
For above-mentioned situation, voltage stabilizer arises at the historic moment, and roughly can be divided into following several:
1, ferromagnetic-resonance type AC voltage regulator: after utilizing saturable reactor and corresponding capacitor bank, there is constant voltage volt-ampere characteristic and the AC stabilizer made.Magnetic saturation type is the early stage typical structure of this voltage stabilizer.Its structure is simple, easily manufactured, and input voltage allows variation range wide, and reliable operation, overload capacity is stronger.But waveform distortion is comparatively large, and degree of stability is not high.
2, magnetic amplifier AC voltage regulator: magnetrol and autotransformer are together in series, utilizes electronic circuit to change the impedance of magnetrol with the device of regulated output voltage.Its circuit form can be Linear Amplifer, also can be width modulation etc.This kind of voltage stabilizer is with the closed-loop system of FEEDBACK CONTROL, so degree of stability is high, and good output waveform.But because adopting the magnetrol that inertia is larger, therefore release time is longer.Again because adopting self coupling mode, so antijamming capability is poor.
3, namely slide type alternating voltage regulator: with changing transformer self-cleaning contact position, make output voltage obtain stable device is the automatic pressure-regulating type AC voltage regulator by driven by servomotor.This kind of voltage regulator efficiency is high, and output voltage waveforms is good, to load characteristic without particular/special requirement.But degree of stability is lower, release time is longer.
Three, summary of the invention
Although tradition voltage stabilizer has the advantages such as structure is simple, cost is lower, its shortcoming also can not be ignored, and has following shortcoming:
1.: the voltage-regulation principle of slide type alternating voltage regulator utilizes carbon brush to contact toroidal transformer Dong line surface sliding to change turn ratio; so in use often there will be the situation of carbon brush abrasion; 2.: reaction velocity is slow, the precision of voltage regulation is low, poor stability; when input voltage fluctuation is very large; often there will be the situation that output voltage is too high or too low, affect the use safety of equipment.3.: state when what during firm start, voltage stabilizer ran is last shutdown, overtension or too low problem during existence just start.4.: the uneven unbalanced problem of output voltage caused of three characteristics of the middle term input voltage can not be solved 5.: defencive function is not enough etc., and these all govern the development of traditional voltage stabilizer.
For solving the problem, develop contactless voltage-stabilizing power-saving technology.
The difference of contactless voltage stabilizing technique and traditional voltage stabilizer with have employed power electronic devices, in present generation power supplies field, ensure that supply unit can be accomplished accurate control and run reliably, Power Electronic Technique must be adopted, use power semiconductor device (controllable silicon) in a device, it is high that power semiconductor device has efficiency, control performance is good, volume is little, lightweight, use many advantages such as reliable, therefore, adopting Power Electronic Technique to upgrade to voltage stabilizer, is the main development direction of high-power voltage stabilizer part.
Non-contact voltage stabilizer is divided into primary circuit and control circuit two parts composition.Primary circuit is made up of adjustable transformer, compensator transformer and controllable silicon, and control section mainly forms with the control circuit of master controller and trigger board composition.In primary circuit, a winding of adjustable transformer is connected into Y type, be connected to the output terminal of voltage stabilizer, Secondary Winding is connected to a winding of compensator, the Secondary Winding of compensator is connected in major loop, by controlling silicon controlled conducting and shutoff, changes the number of turn of pressure regulator, thus change size and the polarity of bucking voltage, and then control the size of output voltage.Compare with traditional mechanical type voltage stabilizer and have the following advantages:
1, the situation that the carbon brush that non-contact voltage stabilizer solves carbon brush type voltage stabilizer structure at all need often be changed, the fault of mechanical compensation type voltage stabilizer 80% comes from mechanical fault and carbon brush abrasion.Service life of equipment and safety are greatly improved
2, compensation range is wider, and efficiency is higher, and overload capacity is strong, and precision is high, and compensation range can reach ± and 20%, efficiency can reach 99%, and precision can reach 1%.
Four, accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing in the following describes is only some embodiments of the present invention.
Fig. 1: primary circuit schematic diagram
Fig. 2: overall hardware block diagram
Fig. 3: steering logic block diagram
Fig. 4: master controller hardware block diagram
Fig. 5: trigger board hardware block diagram
Five, embodiment
Principles and methods: the present invention divides primary circuit and control circuit two parts composition
Fig. 1 is the connection of the controllable silicon of A phase and adjustable transformer, compensator transformer, the connection of other two-phases and this is similar, and in figure, T1 represents compensator transformer, and T2 represents adjustable transformer, S1 ~ S8 is controllable silicon.A winding of adjustable transformer is connected into Y type, is connected to the output terminal of voltage stabilizer, and Secondary Winding is connected to a winding of compensator, and the Secondary Winding of compensator is connected in major loop, and the principle of work of non-contact voltage stabilizer is described for A phase now.UO=Ui+ Δ U, in formula, UO is output voltage, and Ui is input voltage, and Δ U is the bucking voltage of voltage stabilizer A phase.When A phase voltage Ui increases Δ Ui, bucking voltage also can corresponding change Δ U, and Δ U ≈-Δ Ui, A phase output voltage UO is remained unchanged, thus keeps voltage stabilization.Namely present input voltage be greater than the predetermined precision of voltage regulation upper in limited time, compensator provides negative and compensates, output voltage is dropped to and meets in the voltage range of predetermined accuracy, if be less than the upper of the predetermined precision of voltage regulation with input voltage to prescribe a time limit, compensator provides and just compensates, and output voltage is risen to and meets in the voltage range of predetermined accuracy, when input voltage is in the scope of the predetermined precision of voltage regulation, compensator, without the need to affording redress, selects straight-through shelves.In like manner BC phase is also like this.
This product adopts this kind of structure, by controlling the break-make of bidirectional triode thyristor (S1), switch the tap of adjustable transformer (T2), thus the size of bucking voltage and polarity, this just can obtain in the low-pressure side of compensator transformer (T2) bucking voltage that size and Orientation can change, the voltage that the meeting of this voltage and input end provide carries out vector superposed, makes output voltage stabilization on the electrical voltage point of setting, reaches the effect of regulated output voltage.
The selection of controlled silicon conducting: controllable silicon obtains different bucking voltages by combination of two, represent different gears, in figure, controllable silicon S1, S3, S5, S7 can not simultaneously conductings, controllable silicon S2, S4, S6, S8 can not simultaneously conductings, if conducting is directly added in silicon controlled two ends by causing the voltage of pressure regulator, because silicon controlled internal resistance is very little, very large electric current will be born in controllable silicon two ends, cause burn-out of silicon controlled rectifier, S1 and S2 or S3 and S4 or S5 and S6 or S7 and S8 conducting are then straight-through, after straight-through, input voltage is approximately output voltage, and similar bypass runs.By calculating, the bucking voltage that controllable silicon combination of two obtains can be drawn, by optimum choice when input voltage which scope select any two controlled silicon conductings passable to suitable output voltage, ensure that the precision exported is in predetermined scope.Show that gear is corresponding with input voltage thus to show.Control circuit will be taken this as a foundation, and regulate corresponding silicon controlled conducting and cut-off.
The advantage of adopting in this way is as follows:
1, this structure can realize the individual-phase control to ABC three-phase; benefit compared with traditional voltage stabilizer is to solve the degree of unbalancedness between three-phase; even if cause the imbalance of three-phase voltage at the scene in environment for some reason; also can be corrected by voltage stabilizer, have good protective effect to other equipment such as motors.
2, because controllable silicon is not in major loop, the electric current that the electric current that during normal operation, controllable silicon passes through passes through more than load is little, so the capacity coefficient of device can be selected calmly, during work, heating is also much smaller, the long-term work of controllable silicon energy, simultaneously voltage stabilizer capacity also can do very large.
3, owing to adopting single-circuit transformer tap stepped voltage regulation, namely the make-and-break voltage of bidirectional triode thyristor is reduced, (be added in the voltage at controllable silicon two ends at below 200V, some gear only has 20V) can suppress again shift gears time produce surge current (single-circuit transformer is a powerful reactor inherently), thus substantially increase the functional reliability of bidirectional triode thyristor.
Control section is introduced:
This non-contact voltage stabilizer is divided into input voltage sampling, output voltage sampling, MCU Main Processing Unit, controllable silicon action matrix, the control of the pressure regulator number of turn, compensator voltage to form with Polarity Control and protection circuit seven major part.
Equipment adopts three-phase separate conditioning technology, and three-phase work is independent, can carry out voltage stabilizing adjustment to the voltage of each phase, better can ensure precision and the quality of balance of output like this.Its control procedure is introduced below for A phase:
Shown in Fig. 2 is overall hardware block diagram, wherein:
1.: input voltage sampling unit 2.: MCU control unit 3.: controllable silicon matrix motor unit 4.: pressure regulator number of turn control module 5.: compensator voltage and Polarity Control unit 6.: output voltage sampling unit 7.: protection circuit
Control flow chart as shown in Figure 3
Tell about the pressure regulation process of contact voltage stabilizing technique below.
Input gear shift:
By input voltage sampling unit (1.) Gather and input voltage during device power-up, MCU control unit (2.) reads and collects to obtain input voltage, and analyze the gear that will regulate, control controllable silicon matrix motor unit (3.) and make corresponding action, pressure regulator number of turn control module (4.) is selected by silicon controlled conducting, now, compensator voltage and Polarity Control unit (5.) export size and the polarity of bucking voltage, this voltage is added with input voltage and obtains output voltage, controller gathers the voltage of output voltage sampling unit (6.).If output voltage reaches the precision of voltage regulation of design, complete gear shift process, this process is for transfer the files the stage according to input voltage.Until output voltage exceeds the precision of voltage regulation of voltage design.Export gear shift: the output voltage of output voltage sampling unit (6.) exceeds the precision of voltage regulation of voltage design, MCU control unit (2.) will according to output voltage gear shift fine setting gear, prescribe a time limit when output voltage exceeds the upper of designing voltage regulator precision, MCU control unit (2.) makes the negative instruction compensated, controllable silicon matrix motor unit (3.) makes corresponding action, thus drags down output voltage; When output voltage is prescribed a time limit lower than the lower of designing voltage regulator precision, MCU control unit (2.) makes the instruction just compensated, and controllable silicon matrix motor unit (3.) makes corresponding action, thus increases output voltage;
By above-mentioned complete closed loop control process, the precision of voltage regulation scope designed can be obtained.
Control circuit, round MCU control unit design, introduces the composition structure of this element below:
MCU control unit: comprise primary controller control module, trigger board control module
Main controller controls unit and trigger board control module transmit data by RS485 communications protocol
Main controller controls unit hardware block diagram is as shown in Figure 4:
Main controller controls unit is made up of main control chip PIC18F65K80 and electric power acquisition chip ATT7022C, input and output voltage and input current are converted into can pass through SPI interface communication transmission of signal for the voltage and current signal measured to ATT7022C, ATT7022C and PIC18F65K80 by voltage transformer pt 2011, input currents by HCT215 current transformer by input and output voltage.The voltage and current signal of collection is obtained corresponding shift signal by analyzing and processing by PIC18F65K80, then passes to trigger board control module by 485 communications, by the corresponding controllable silicon of trigger board control module conducting.And show on liquid crystal display.Primary controller, except above-mentioned functions, also has following functions:
1, voltage stabilizing reference value sets: user can set the voltage reference value in three time periods, and voltage stabilizer can be made automatically to operate in different voltage stabilizing values at Different periods.
2, automatic voltage regulation: controller, by Gather and input voltage and the automatic regulation stall of output voltage, reaches predetermined precision of voltage regulation scope
3, manual gear shift: voltage stabilizer operates on a certain gear by artificially arranging by controller, uses when this function can be used as gear test and abnormal conditions process.
4, abnormity protection function:
Electric voltage exception:
When input does not meet gear shift scope or output does not meet voltage stabilized range, adopt straight-through shelves to export, the similar bypass of straight-through shelves exports, but adopts straight-through shelves can not power-off, if straight-through shelves are abnormal, can be adjusted to another straight-through shelves and export.
Temperature anomaly:
When silicon controlled module is overheated, first open fan cooled, when silicon controlled module exceedes uniform temperature again, bypass exports, and ensures the safety of equipment.
Trigger board control module hardware block diagram as shown in Figure 5
Trigger board control module MCU is Master control chip by STC series monolithic, is carried out the gear data of autonomous controller by 485 data receivers, controls silicon controlled conducting and cut-off by latch, code translator, and then completes the stable of output voltage.Latch: in order to improve the performance of equipment, when single-chip microcomputer occurs the situation of power-off because of causing controllable silicon all to end when abnormal interference or program fleet, latch devices is introduced in circuit, when monolithic processor resetting, latch works, gear data keep last gear data, increase the antijamming capability of equipment.
Code translator: in order to prevent the situation of controllable silicon S1, S3, S5, S7 conducting simultaneously or controllable silicon S2, S4, S6, S8 conducting simultaneously, decoding device is introduced in circuit, the trigger pip of controllable silicon S1, S3, S5, S7 is connected on a decoding device, and the trigger pip of controllable silicon S2, S4, S6, S8 is connected on another decoding device.Ensure silicon controlled safety.
Thyristor gating circuit: adopt zero cross fired optocoupler, the controllable silicon action occurred when making to shift gears completes at zero crossing, reduces and impacts silicon controlled because of during gearshift.Add silicon controlled reliability.
Claims (6)
1. a contactless stable-pressure device, comprises compensator, pressure regulator, controllable silicon, primary controller composition.
Wherein: a winding of adjustable transformer is connected into Y type, is connected to the output terminal of voltage stabilizer, Secondary Winding is connected to a winding of compensator, and the Secondary Winding of compensator is connected in major loop.
2. stable-pressure device as claimed in claim 1, it is characterized in that, by controlling the break-make of bidirectional triode thyristor, switch the tap of adjustable transformer, thus the size of bucking voltage and polarity, this just can obtain in the low-pressure side of compensator transformer the bucking voltage that size and Orientation can change, this voltage can and the voltage that provides of input end carry out vector superposed, make output voltage stabilization on the electrical voltage point of setting, reach the effect of regulated output voltage.
3. stable-pressure device as claimed in claim 2, if the precision of input reaches the accuracy rating exporting and allow, can select straight-through shelves to export, and straight-through shelves uncompensation voltage, output voltage follows input voltage.
4. stable-pressure device as claimed in claim 1, adopts three-phase phase-splitting voltage-regulating technique, can solve the degree of unbalancedness between three-phase, even if cause the imbalance of three-phase voltage in environment for some reason at the scene, also can be corrected by voltage stabilizer.
5. stable-pressure device as claimed in claim 1, controllable silicon is not in major loop, and the electric current that the electric current that during normal operation, controllable silicon passes through passes through more than load is little, so the capacity coefficient of device can be selected calmly, during work, heating is also much smaller, the long-term work of controllable silicon energy.
6. stable-pressure device as claimed in claim 1, owing to adopting single-circuit transformer tap stepped voltage regulation, namely the make-and-break voltage of bidirectional triode thyristor is reduced, (be added in the voltage at controllable silicon two ends at below 200V, some gear only has 20V) can suppress again shift gears time produce surge current (single-circuit transformer is a powerful reactor inherently), thus substantially increase the functional reliability of bidirectional triode thyristor.
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| CN201410442500.0A CN104793675A (en) | 2014-08-27 | 2014-08-27 | Contactless voltage stabilizer |
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| CN201410442500.0A CN104793675A (en) | 2014-08-27 | 2014-08-27 | Contactless voltage stabilizer |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451467A (en) * | 2016-10-25 | 2017-02-22 | 三尔梯(泉州)电气制造有限公司 | Three-phase full-automatic voltage-stabilizing electric energy restorer and restoration method |
| CN106714417A (en) * | 2016-12-09 | 2017-05-24 | 宝山钢铁股份有限公司 | Industrial intelligent lighting voltage stabilizer |
| CN109164860A (en) * | 2018-11-15 | 2019-01-08 | 湖南工业大学 | Railway signal AC power source stable-pressure device |
| CN109189135A (en) * | 2018-11-15 | 2019-01-11 | 湖南工业大学 | Subregion Autocompensation AC voltage-stabilizing control method |
| CN109245552A (en) * | 2018-11-15 | 2019-01-18 | 湖南工业大学 | Subregion Autocompensation three-phase alternating current pressure stabilizing control method |
| CN109254607A (en) * | 2018-11-15 | 2019-01-22 | 湖南工业大学 | AC stabilizer |
| CN109254609A (en) * | 2018-11-15 | 2019-01-22 | 湖南工业大学 | Subregion Autocompensation three-phase AC voltage stabilizer control method |
| CN109302080A (en) * | 2018-11-15 | 2019-02-01 | 湖南工业大学 | Railway signal power supply stable-pressure device |
| CN109358679A (en) * | 2018-11-15 | 2019-02-19 | 湖南工业大学 | A kind of IGBT group gating configuration method |
| CN109407743A (en) * | 2018-11-15 | 2019-03-01 | 湖南工业大学 | AC voltage regulator |
| CN109407741A (en) * | 2018-11-15 | 2019-03-01 | 湖南工业大学 | Three-phase AC voltage stabilizer |
| CN109407740A (en) * | 2018-11-15 | 2019-03-01 | 湖南工业大学 | Three-phase alternating current pressure stabilizing control method |
| CN110231848A (en) * | 2019-04-28 | 2019-09-13 | 明珠电气股份有限公司 | The non-contact voltage stabilizer main circuit and non-contact voltage stabilizer of combined type high voltage stability precision |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451467A (en) * | 2016-10-25 | 2017-02-22 | 三尔梯(泉州)电气制造有限公司 | Three-phase full-automatic voltage-stabilizing electric energy restorer and restoration method |
| CN106714417A (en) * | 2016-12-09 | 2017-05-24 | 宝山钢铁股份有限公司 | Industrial intelligent lighting voltage stabilizer |
| CN109254609A (en) * | 2018-11-15 | 2019-01-22 | 湖南工业大学 | Subregion Autocompensation three-phase AC voltage stabilizer control method |
| CN109189135A (en) * | 2018-11-15 | 2019-01-11 | 湖南工业大学 | Subregion Autocompensation AC voltage-stabilizing control method |
| CN109245552A (en) * | 2018-11-15 | 2019-01-18 | 湖南工业大学 | Subregion Autocompensation three-phase alternating current pressure stabilizing control method |
| CN109254607A (en) * | 2018-11-15 | 2019-01-22 | 湖南工业大学 | AC stabilizer |
| CN109164860A (en) * | 2018-11-15 | 2019-01-08 | 湖南工业大学 | Railway signal AC power source stable-pressure device |
| CN109302080A (en) * | 2018-11-15 | 2019-02-01 | 湖南工业大学 | Railway signal power supply stable-pressure device |
| CN109358679A (en) * | 2018-11-15 | 2019-02-19 | 湖南工业大学 | A kind of IGBT group gating configuration method |
| CN109407743A (en) * | 2018-11-15 | 2019-03-01 | 湖南工业大学 | AC voltage regulator |
| CN109407741A (en) * | 2018-11-15 | 2019-03-01 | 湖南工业大学 | Three-phase AC voltage stabilizer |
| CN109407740A (en) * | 2018-11-15 | 2019-03-01 | 湖南工业大学 | Three-phase alternating current pressure stabilizing control method |
| CN109245552B (en) * | 2018-11-15 | 2021-03-16 | 湖南工业大学 | Partitioned self-coupling compensation three-phase alternating current voltage stabilization control method |
| CN110231848A (en) * | 2019-04-28 | 2019-09-13 | 明珠电气股份有限公司 | The non-contact voltage stabilizer main circuit and non-contact voltage stabilizer of combined type high voltage stability precision |
| CN110231848B (en) * | 2019-04-28 | 2020-10-02 | 明珠电气股份有限公司 | Combined type high voltage-stabilizing precision contactless voltage stabilizer main circuit and contactless voltage stabilizer |
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