CN201247959Y - Stillness type high voltage reactive compensator of control transformer based on thyristor - Google Patents
Stillness type high voltage reactive compensator of control transformer based on thyristor Download PDFInfo
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- CN201247959Y CN201247959Y CNU2008200300538U CN200820030053U CN201247959Y CN 201247959 Y CN201247959 Y CN 201247959Y CN U2008200300538 U CNU2008200300538 U CN U2008200300538U CN 200820030053 U CN200820030053 U CN 200820030053U CN 201247959 Y CN201247959 Y CN 201247959Y
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- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a TST type SVC high-voltage stillness reactive power compensator which comprises an inductance regulating unit of a TCT high-impedance transformer. The TCT is mainly characterized in that the typical value of impedance voltage is 100 percent, the secondary rated voltage ranges from 1000V to 2000V, the connection groups of high voltage and low voltage are D and yn. In addition, the high-voltage stillness reactive power compensator also comprises a thyristor cabinet, an FC passive filtering branch circuit and a control cabinet, wherein the control cabinet is mainly composed of a regulator, a PLC and a touch screen. The regulator uses a DSP as a processor which collects the current and the voltage of a system to quickly calculate the reactive power required by the system, and outputs the trigger pulse corresponding to the reactive power to a thyristor after being modulated by a pulse output plate. The response speed can reach less than 100ms. The unitized high-voltage stillness reactive power compensator has high intellectualization, high degree of automation and complete protection function to reach the requirements of unattended duty. Simultaneously, the cost is lower, and the reactive power compensator is more suitable for the popularization a SVC stillness reactive power compensator.
Description
Technical field
The utility model relates to a kind of reactive power compensation device, particularly a kind of silent oscillation based on thyristor control transformer (TCT) (SVC) high-pressure reactive compensation device.
Background technology
Along with net capacity constantly enlarges, large-scale uncompensated load such as impact load such as the nonlinear-load of power application electronic component, arc furnace, milling train and electric locomotive inserts in the electrical network, has brought many power quality problems such as harmonic wave, flickering to electrical network.A basic reason that wherein causes voltage fluctuation is that the idle quick variation of load causes, yet conventional reactive-load compensation equipment, because response speed is slower, can't address this problem, therefore occurred with semiconductor elements such as thyristors as " silent oscillation " compensation equipment of regulating actuator, i.e. SVC (Static Var Compensator).SVC can provide rapidly, continuously reactive power compensation to system, thereby the reactive power impact that reduces load reduces voltage fluctuation and flicker, owing among the SVC filter branch is arranged generally, can carry out filtering to the harmonic wave that load produces simultaneously.SVC mainly is divided into two parts, promptly adjustable inductive part and filtering and reactive power compensation part.Filtering and reactive power compensation part are made up of 2 tunnel (or more) passive filterings branch road usually, and required capacitive power and harmonic passage afford redress; Controllable impedance partly mainly contains TCR type (thyristor-controlled reactor) and two kinds on MCR type (magnet controlled reactor), and details are as follows:
1.MCR type: major defect is that the response time is slower, and generally about 300ms, and the common response time of TCR is 10ms; Next is owing to the MCR employing is the magnetic saturation operation principle, and the linearity of its inductance is also relatively poor; In addition, the controllable silicon that uses among the MCR is on the high potential, and triggering modes such as need employing photoelectricity isolation solve the Insulation Problems between control signal (electronegative potential) and controllable silicon (high potential).The high potential operation has brought a series of more unmanageable problems to silicon controlled triggering, protection, monitoring etc.
2.TCR type: the same with MCR, TCR directly is used in controllable silicon in the high pressure, have the same problem of above-mentioned MCR, difference is that the controllable silicon among the TCR needs many series connection usually, be designed to jumbo silicon valve, this is very high to requirements such as silicon controlled trigger, dispels the heat, all presses, so the controllable silicon part is more complicated than MCR structure, and difficulty is bigger, and floor space is big, and maintenance is big.
For solving the problem that above 2 class controllable impedances exist, TCT (thyristor control transformer) type SVC arises at the historic moment, Hengyang steel-making subsidiary factory adopts TCT type static reacance power compensating device (hereinafter to be referred as TCT type SVC) as far back as last century Mo, problems such as the high order harmonic component that 2 * 30t arc furnace produces electrical network, voltage fluctuation, voltage distortion have been solved, the basic principle of TCT is that the secondary by the short circuit high-impedance transformer provides lagging reactive power, TCT has the electrical characteristic about the same with TCR, for example response time, the linearity etc.; Also have the flexibly control characteristic suitable with TCR, can gamut from the angle of flow of 90 °～180 ° phase-splittings control thyristors; Some characteristic of TCT also is better than TCR in addition, as capability of overload is stronger than TCR, floor space is littler, electromagnetic leakage still less waits.And need not to use high pressure silicon valve, reliability height, simple in structure, working service convenience have solved the problem that TCR and MCR all need complicated controllable silicon system to bring.
TCT type SVC forms the controllable impedance part by TCT high-impedance transformer and controllable silicon two parts, and its basic principle figure sees accompanying drawing 1.Take the TCT branch road as transferring the sense branch road must satisfy following 2 points: one, must satisfy the primary demand of SVC, be that the TCT branch road can externally provide the continually varying lagging reactive power, from shown in the equivalent electrical schematic diagram 2 of TCT branch road as can be seen, the equivalent electric circuit of TCT branch road and TCR branch road are similar, can externally provide continuously adjustable lagging reactive power by the silicon controlled angle of flow of controlling the TCT secondary.Its two, can solve the problem that TCR and MCR exist, controllable silicon is operated under the low voltage, have simultaneously the response time fast, control advantage flexibly.
Summary of the invention
The purpose of this utility model is, a kind of silent oscillation high-pressure reactive compensation device based on the thyristor control transformer is provided.
In order to realize above-mentioned task, the utility model is taked following technical solution:
A kind of silent oscillation high-pressure reactive compensation device based on the thyristor control transformer is characterized in that this device comprises:
Connect TCT high-impedance transformer on the line, the impedance voltage representative value of this TCT high-impedance transformer is 100%, and the secondary rated voltage is at 1000～2000V, and the high-low pressure connection set is D, yn;
Be connected with the controllable silicon cabinet on the TCT high-impedance transformer, TCT high-impedance transformer and controllable silicon group become to transfer the sense branch road, when TCT high-impedance transformer impedance voltage representative value is 100%, when reaching rated voltage on the former limit of TCT transformer, secondary is short circuit operation then, and long-time running continuously;
At least one road connects filter branch on the line, form by filter reactance and filter capacitor coupling, be used for characteristic harmonics number of times and size, an impedance path is provided for the system features harmonic wave according to system, filter branch also provides reactive power in the filtering harmonic wave;
One control cubicle; be connected with TCT high-impedance transformer, filter branch and controllable silicon cabinet respectively; be used for TCT high-impedance transformer, filter branch and controllable silicon cabinet are controlled, monitored and protect, user-machine interface is provided simultaneously, also have the function of log history service data.
The technique effect that the utility model brings is:
1. owing to need not to adopt high pressure silicon valve, simplified the complexity of system greatly, improved the reliability and security of system, it is simpler that operation maintenance also becomes.
2. TCT provides the inductance current that transformer short-circuit produces, so its capability of overload is better than TCR greatly.
3. owing to use controllable silicon as the main regulation device, do not have arcing during adjusting, shove, service life of equipment is long.And can regulate reactive power continuously by changing the angle of flow.
4. the control of TCT type SVC high voltage static reactive power compensator includes an adjuster of being realized by the DSP full-digital circuit at least, adopts real time operating system, and response speed is fast, less than 10ms, and the degree of regulation height.And simultaneously acquisition system electric current and load current, instantaneous adjusted open loop combines with the PI closed-loop adjustment, has not only guaranteed response speed but also can the optimal compensating effect.
5. comprise one at least and mainly realize comprising supervision, make the complete sets of equipment simple, stable adjuster to installing perfect defencive function by PLC.
6. comprise a touch-screen at least as man machine operation interface, but register system electric parameter data, and power down keeps.
7. can freely select various communication interfaces, be adapted to various industrial occasions or transformer station.
Description of drawings
Fig. 1 is the electrical schematic diagram of TCT type SVC;
Fig. 2 is the equivalent electrical schematic diagram of TCT branch road.
Fig. 3 is a structural representation of the present utility model.
Fig. 4 is the adjuster block diagram.
Fig. 5-1,5-2,5-3,5-4,5-5 are adjuster circuit figure.
Fig. 6 is an adjuster software main flow chart.
The utility model is described in further detail below in conjunction with accompanying drawing and instantiation.
Embodiment
According to applicant's further research, TCT must possess following 3 features:
1. impedance voltage is far above common transformer, and generally more than 80%, the modular design value is generally 100%.Need export certain perceptual reactive current owing to transfer the sense branch road, generally method is direct tandem electric inductance behind transformer more intuitively, and the thinking that the utility model is taked is to improve the impedance voltage of transformer, when transformer impedance drop reaches 100%, can allow transformer is long-term operation continuously under rated voltage, the secondary dead short circuit on former limit, and this moment, transformer was externally exported lagging reactive power.The thinking of this high-impedance transformer is actually transformer and reactor is integrated together, can controllable silicon be operated under the low voltage by the transformer step-down, can externally provide a large amount of lagging reactive powers by the transformer high impedance again, thereby constitute the branch road of a prerequisite continuous accent sense of SVC system by TCT and low pressure controllable silicon.Therefore the transformer of 100% impedance voltage is notable feature of the present utility model as the regulative reactance branch road, and in addition because the short-circuit impedance height, the linearity of TCT compensation might as well.
2. the secondary output voltage is 1000V～2000V.TCR (thyristor-controlled reactor) or these two kinds of controllable impedances of MCR (magnet controlled reactor) branch road all need controllable silicon is placed on the high potential, and this has brought trouble to application such as silicon controlled triggering, protections, and the reliability of the complete sets of equipment also reduces simultaneously.For addressing this problem, voltage is dropped to the voltage that is fit to controllable silicon work by transformer, as 1000V～2000V, controllable silicon can directly be used (need not to be connected into the silicon valve), the benefit of doing like this is to make thyristor reduce (the silicon valve in the TCR) in a large number, system complexity reduces, and reliability improves.
3. the connection set of transformer is D, yn, former limit winding adopts D type connection to provide passage for 3 subharmonic, avoided the excessive transformer that causes of 3 subharmonic leakage fields of TCT to generate heat seriously, 3 subharmonic of also having avoided TCT to produce inject harmonic pollution to electrical network, the secondary winding adopts the yn connection, three-phase circuit is controlled to be independent of each other, can be from 90 °～180 ° gamut controls, its equivalent electric circuit and TCR are suitable substantially, thereby simplified control, made the imbalance compensation function of phase-splitting control and whole SVC be easier to realize.
According to the technical solution of the utility model, apparatus structure schematic diagram of the present utility model as shown in Figure 3, it comprises the accent sense branch road that TCT high-impedance transformer and controllable silicon group become at least; It is idle that the secondary of employing low pressure controllable silicon cabinet short circuit high-impedance transformer is exported continuously adjustable perception, the filter branch more than at least 1; And 1 control cubicle is formed.
1. transfer the sense branch road: it is become by TCT high-impedance transformer and low pressure controllable silicon group.
The impedance representative value of TCT high-impedance transformer is 100%; The secondary rated voltage of high-impedance transformer is at 1000V～2000V; The high-low pressure connection set of high-impedance transformer is D, yn.When the former limit of TCT transformer reached rated voltage, secondary can short circuit operation, and long-time running continuously.It integrates transformer and reactor, has both played hypotensive effect, can provide perception idle as reactor again.
The controllable silicon cabinet mainly comprises thyristor, and heat-sink unit triggers and protected location.Because the secondary output voltage of TCT has only 1000V～2000V, therefore use the controllable silicon of discrete component to get final product as main controlling element, need not a plurality of controllable silicon polyphones, thereby saved complicated all pressures, high-low pressure isolation link.Heat-sink unit generally comprises fin and fan, complicated water-cooling is all higher to heat dissipation equipment and reliability requirement, and common air-cooled radiator radiating effect is general, therefore the heat-pipe radiators that adopt more, all right auxiliary ligand is with little air quantity blower fan, more excellent than heat pipe self-cold radiating effect, and overall noise is also less.
The controllable silicon cabinet is connected on the secondary of TCT high-impedance transformer, by the control silicon controlled angle of flow, but the size that the output of flexible TCT branch road is idle, when thyristor operating angle is 90 °, be equivalent to the dead short circuit of TCT secondary, the external reactive power maximum of output of TCT this moment reaches the rated value of TCT capacity.When thyristor operating angle is 180 °, be equivalent to the TCT secondary and open a way fully, the reactive power minimum that this moment, TCT externally exported, zero no better than.
2. filter branch: mainly forms by filter reactance and filter capacitor coupling, for circuit provides capacitive reactive power, the harmonic wave of absorption system generation simultaneously.It generally by 2 the road or more the single tuning filtering channel formed of multichannel inductance, electric capacity form, the inductance of each filter branch, electric capacity mix into the resonance frequency of character pair subharmonic, harmonic impedance to characteristic frequency is very low, therefore most of characteristic harmonics electric current flows into filter branch, only has few part to flow into system.Each filter branch all is furnished with corresponding protection simultaneously, for example unbalance protection and overload protection, the effect of unbalance protection are to break down when capacitor, for example cause 3 when internal breakdown or interior (outward) fuse failure mutually during imbalance, send fault-signal, filter branch and electrical network are disconnected; Overload protection refers generally to flow into the excessive or capacitor faults itself of the harmonic current of filter branch when causing the filter branch overcurrent, sends fault-signal, and filter branch and electrical network are disconnected.
3. control cubicle: control cubicle is the maincenter of whole SVC system, and its effect is the operation of coordinating SVC system each several part, the effect that each several part is played protection, monitors simultaneously, in addition as man-machine interface, to the user provide alternately, interface operable.Control cubicle mainly comprises adjuster, PLC, touch-screen 3 parts.
Adjuster is responsible for voltage, the electric current of acquisition system, and what computing system lacked is idle, thereby according to the calculation of parameter silicon controlled angle of flow that system is provided with, then the pulse train of correspondence is exported to controllable silicon.The circulation that do not stop of this process then, in whole system is operated in predefined scope, for example idle or power factor controlling is in certain scope, the block diagram of adjuster as shown in Figure 4, adjuster is made up of primary processor CPU, analog quantity and digital quantity input module, pulse and relay output module, LCD display circuit, RS232 communication interface etc.DSP analyzes, calculates the sampled signal that the sampled signal input module is sent here, and the trigger impulse of correspondence is outputed to controllable silicon.When breaking down, also exportable alarm signal.The RS232 communication interface both can be used for directly and the external equipment communication, also can with carry out wireless telecommunications after wireless communication module is connected.
Above each several part organic assembling becomes a silent oscillation high-pressure reactive compensation device based on the thyristor control transformer, it can the idle variation (response speed can reach 10ms) of THE FAST TRACKING SYSTEM FOR, the harmonic wave that filtering appts produces, improve the imbalance that system loading produces, the voltage fluctuation and flicker that sudden change causes to system loading plays certain inhibitory action.
The triggering and the protected location of device consist predominantly of pulse transformer, zinc oxide arrester, saturable reactor, Hall element and fast acting fuse etc.Wherein pulse transformer is used for the isolation between adjuster triggering output and controllable silicon gate pole, so pulse transformer must have enough dielectric strengths; Zinc oxide arrester is used to prevent the damage of controllable silicon under various over-voltage condition, as thunderbolt surge, the system failure, operation ripple etc.; The anode film reactor has two effects, higher current-rising-rate (di/dt) and higher surge current that one occurs when being used to limit the thyristor element conductive, it two is to be in the blocking interval circuit and higher voltage climbing (du/dt) occurs when thyristor, and opening by mistake of causing is logical to avoid the surge voltage that the thyristor element born; Hall current sensor is used for measurement and flows through each silicon controlled electric current, is used to cooperate electronic circuit to realize silicon controlled overcurrent or breakdown protection; Fast acting fuse also is used for the silicon controlled overcurrent protection, is the backup protection of controllable silicon overcurrent Electronic Protection, plays the purpose that controllable silicon is not burnt out when Electronic Protection lost efficacy.
Fig. 5-1 is the circuit diagram of adjuster to Fig. 5-5.Fig. 5-1 is DSP motherboard circuit figure, and this part mainly is made up of digital signal processor (DSP) chip TMS 320 F 2812 and external circuit thereof, as the internal memory expansion, and bus expansion, JTAG DLL (dynamic link library) etc.Include power supply chip in addition, clock chip, storage chip etc.Fig. 5-2 is motherboard circuit figure, and the digital quantity input and the relay output circuit of more integrated light-coupled isolations also have communication interface in addition.Fig. 5-3 is the bus board circuit diagram, and bus board is responsible for the bus contact between each circuit board, mainly comprises address and the data/address bus of DSP, includes liquid crystal and keyboard input interface in addition.Fig. 5-4 is an instrument transformer plate circuit diagram, mainly comprises the modulate circuit of voltage, current analog amount input, but mainly to act on be the weak electric signal that forceful electric power conversion of signals controlled device is accepted for it.Fig. 5-4 is the output board circuit diagram, and output board mainly comprises the output circuit of pulse signal.
Fig. 6 is the software main flow chart of adjuster, the software design of adjuster becomes the real-time multi-task structure, for guaranteeing the best of SVC compensation effect, in regularly interrupting, call sampling and calculation procedure, reach 10ms, must guarantee that the limit priority that regularly interrupts is other with the response speed that guarantees system, other tasks all realize by software interrupt, by the time of implementation of each submodule of task management program optimized distribution, as man-machine interface, communication etc.The workflow of software is: program initialization, and for example timer setting of DSP interrupt to be provided with, and I/O is provided with, the communications parameter setting, house dog is provided with etc.After promptly enter the major cycle of program, branch stepping row such as each several part work such as AC sampling, idle calculating, harmonic analysis, system mode digital data acquisition, by calculating the control angle of judging corresponding TCT, output gets final product, the idle variation of tracking system is continued in the output back, constantly revise output angle, till the requirement that meets parameter setting.
In addition, also comprise PLC and touch-screen in the control cubicle.PLC concentrates state or the malfunctioning node signal that has monitored system's each several part, accepts user's operational order, and the sequencing of the start and stop of coordination package unit will install by default program when fault and electrical network breaks away from.The information that touch-screen then obtains PLC is to show intuitively, for example show each several part running status and electrical network parameter in real time, write down various fault messages, historical data in order to inquiry, operations such as button more traditional in the operation of user to complete set of equipments are more flexible.
In sum, the utility model is a kind of new silent oscillation high-pressure reactive compensation device based on the thyristor control transformer, owing to adopted the TCT high-impedance transformer as idle continuous regulon, compare with traditional TCR or MCR type SVC, well solved the problems of controllable silicon in SVC uses, made the operation of SVC device more simple and reliable; While control circuit novelty, intelligent and automaticity height, defencive function is perfect, can reach the requirement of unattended duty; Cost is relatively low in addition, so the utility model has good practical value to the popularization of SVC with popularizing.
Claims (4)
1. silent oscillation high-pressure reactive compensation device based on the thyristor control transformer is characterized in that this device comprises:
Connect TCT high-impedance transformer on the line, the impedance voltage representative value of this TCT high-impedance transformer is 100%, and the secondary rated voltage is at 1000～2000V, and the high-low pressure connection set is D, yn;
Be connected with the controllable silicon cabinet on the TCT high-impedance transformer, TCT high-impedance transformer and controllable silicon group become to transfer the sense branch road, when TCT high-impedance transformer impedance voltage representative value is 100%, when reaching rated voltage on the former limit of TCT transformer, secondary is short circuit operation then, and long-time running continuously;
At least one road connects filter branch on the line, form by filter reactance and filter capacitor coupling, be used for characteristic harmonics number of times and size, an impedance path is provided for the system features harmonic wave according to system, filter branch also provides reactive power in the filtering harmonic wave;
One control cubicle; be connected with TCT high-impedance transformer, filter branch and controllable silicon cabinet respectively; be used for TCT high-impedance transformer, filter branch and controllable silicon cabinet are controlled, monitored and protect, user-machine interface is provided simultaneously, also have the function of log history service data.
2. the silent oscillation high-pressure reactive compensation device based on the thyristor control transformer as claimed in claim 1 is characterized in that, includes adjuster, PLC and touch-screen in the described control cubicle at least.
3. the silent oscillation high-pressure reactive compensation device based on the thyristor control transformer as claimed in claim 2, it is characterized in that, described adjuster is made up of primary processor CPU, analog quantity and digital quantity input module, pulse and relay output module, LCD display circuit, RS232 communication interface, adjuster also is provided with remote communication interface and Control Software, Control Software adopts real-time multi-task operating system, reactive power that can calculation element lacked fast and with the controllable silicon in the corresponding pulse output control controllable silicon cabinet, its response speed is 10ms.
4. the silent oscillation high-pressure reactive compensation device based on the thyristor control transformer as claimed in claim 1 is characterized in that described controllable silicon cabinet contains thyristor, heat-sink unit, triggering and protected location.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200300538U CN201247959Y (en) | 2008-08-25 | 2008-08-25 | Stillness type high voltage reactive compensator of control transformer based on thyristor |
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| CNU2008200300538U CN201247959Y (en) | 2008-08-25 | 2008-08-25 | Stillness type high voltage reactive compensator of control transformer based on thyristor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697419B (en) * | 2009-10-29 | 2012-02-29 | 哈尔滨九洲电气股份有限公司 | Integrated controlled system and integrated controlled method for dynamic reactive power compensation based on touch screen, PLC and DSP |
| CN102751731A (en) * | 2012-07-10 | 2012-10-24 | 山东新风光电子科技发展有限公司 | High voltage dynamic reactive compensation device |
| CN102842913A (en) * | 2012-09-18 | 2012-12-26 | 西安西博电气有限公司 | Mixed switch control type medium-high voltage dynamic reactive power compensator |
| CN104037784A (en) * | 2014-06-10 | 2014-09-10 | 贾继莹 | Coupled thyristor controlled serial compensation device |
| CN104333003A (en) * | 2014-10-28 | 2015-02-04 | 国网辽宁省电力有限公司朝阳供电公司 | Harmonic control method for photovoltaic power generation system |
-
2008
- 2008-08-25 CN CNU2008200300538U patent/CN201247959Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697419B (en) * | 2009-10-29 | 2012-02-29 | 哈尔滨九洲电气股份有限公司 | Integrated controlled system and integrated controlled method for dynamic reactive power compensation based on touch screen, PLC and DSP |
| CN102751731A (en) * | 2012-07-10 | 2012-10-24 | 山东新风光电子科技发展有限公司 | High voltage dynamic reactive compensation device |
| CN102842913A (en) * | 2012-09-18 | 2012-12-26 | 西安西博电气有限公司 | Mixed switch control type medium-high voltage dynamic reactive power compensator |
| CN104037784A (en) * | 2014-06-10 | 2014-09-10 | 贾继莹 | Coupled thyristor controlled serial compensation device |
| CN104333003A (en) * | 2014-10-28 | 2015-02-04 | 国网辽宁省电力有限公司朝阳供电公司 | Harmonic control method for photovoltaic power generation system |
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Granted publication date: 20090527 Termination date: 20170825 |