CN104410079A - High voltage electronic switch device of zero-crossing switching multi-group capacitors and control method of high voltage electronic switch device - Google Patents
High voltage electronic switch device of zero-crossing switching multi-group capacitors and control method of high voltage electronic switch device Download PDFInfo
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- CN104410079A CN104410079A CN201410612740.0A CN201410612740A CN104410079A CN 104410079 A CN104410079 A CN 104410079A CN 201410612740 A CN201410612740 A CN 201410612740A CN 104410079 A CN104410079 A CN 104410079A
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
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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
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a high voltage electronic switch device of zero-crossing switching multi-group capacitors and a control method of the high voltage electronic switch device. The device comprises a controller, a thyristor valve set formed by multiple sets of thyristors connected in series, multiple FC branches, a switching contactor and a bypass contactor. Through opening and closing control on the thyristor valve set, the switching contactor and the bypass contactor, flexible, rapid, no inrush current and low consumption switching on the multi-group capacitors is realized, service life of electrical equipment is prolonged, compared with a traditional method through which one electronic switch can control only one capacitor set, the device provided by the invention greatly reduces investment cost, guarantees stable and reliable operation of the system and is adaptive to the wattless rapid change fields, such as harbors and coal mines.
Description
Technical field
The invention relates to power system reactive power compensation technical field, is specifically related to a kind of high-pressure electronic switching device and control method thereof of operating passing zero multiple unit capacitor.
Background technology
Along with the fast development of Chinese national economy, a large amount of perception, impact and nonlinear load (as electric welding machine, crane, rolling mill) are accessed electrical network, extensive use in a large number, and they can consume a large amount of reactive power in system cloud gray model, cause line voltage distribution to fall to increase with electric energy loss, directly have influence on the economic benefit of electric power enterprise.Consider investment economy and compensation effect, usually can install Capacitor banks with energy-saving and cost-reducing in distribution network systems, capacitor switching controls and operation then directly affects reactive power compensation effect.
In middle-and-high voltage system, opening-closing capacitor bank common circuit has mechanical contact fling-cut switch, thyristor switchable capacitor, parallel connection type electronic switch etc.Mechanical contact fling-cut switch cost is lower, but exists when capacitance group drops into and impact large (minimum is 7 times of rated current), also there is the spring of combined floodgate mechanical contact, and open contact and to restrike dangerous probability, this can cause Capacitor banks overvoltage, damages capacitor.TSC reactive power compensator instead of traditional mechanical switch owing to adopting thyristor switch, switching is reliable, can realize dropping into without inrush current and current over-zero excises, without arc reignition, thus substantially solve mechanical switch contact and be subject to arcing and the unfavorable condition damaged; But for the middle-and-high voltage system of 6 ~ 35kV, need to organize Thyristors in series, when putting into operation for a long time, power consumption is large more, and the technical difficulty of heat radiation facility is also large, and cost is high.In low pressure 380V electrical network, the domestic electronic switch had in parallel manipulator contact, thyristor two ends, it supports the use non-impact current, and energy consumption is extremely low, but does not almost apply in middle-and-high voltage system.
Notification number is the patent of invention " a kind of tandem type electronic switching circuit of opening-closing capacitor bank " of CN1845456A, its concrete structure as shown in Figure 1, by high voltage silicon stack D1 and high-voltage and current-limitation resistant series R1, then parallel manipulator switch S 1, compress switch as low precision height is resistance at a slow speed; Diode D2, thyristor Q1 and mechanical switch S2 parallel circuits composition quick high accuracy is low resistance toly compresses switch, connect with the former; Series reactor L1 and capacitor C1 again; Controller controls the ON-OFF of thyristor and controls mechanical switch deciliter.This device switching effect is impacted with the accurate no current of TSC switching, and the operation precision of device requires to relax 5.5 times than synchro switch under equivalent effect, and run power consumption almost nil, cost is far smaller than TSC device.But when this application of installation is in the occasion that electric pressure is higher, need connect multiple diode and thyristor, an electronic switch only controls a group capacitor, does not relate to for switching multiple unit capacitor, and its cost aspect is still without greater advantage.
Notification number is the patent of invention " Lossless intelligent switching device for high-voltage capacitor bank " of CN102522758, its concrete structure as shown in Figure 2, this device is made up of controller, capacitor group switching unit, capacitor group switching unit mainly comprises thyristor (often organizing thyristor inverse parallel) and the vacuum contactor of many group series connection, single-chip microcomputer detects in real time, Based Intelligent Control.Adopt real-time sensing capacitor residual voltage technology, when controller detects that residual voltage and electric power system supply power voltage equal and opposite in direction on capacitor, direction are identical, turn on thyristors; Switched capacitor no-flashy-flow, without overvoltage, without transient process, can frequent switching, guarantee the harmless switching to Capacitor banks, solve the difficult point of TSC in high-voltage fence uses and technical bottleneck.But this device is only limitted to realize the switching to single cover Capacitor banks, and when system need throw multiple unit capacitor, cost is higher equally.
Summary of the invention
For the problems referred to above, the object of this invention is to provide high-pressure electronic switching device and the control method thereof of low, the reliable operating passing zero multiple unit capacitor of a kind of cost, to realize flexible, quick, no-flashy-flow, the low-loss switching to multiple unit capacitor.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of high-pressure electronic switching device of operating passing zero multiple unit capacitor, comprises controller, by organizing the thyristor controlled series compensation that Thyristors in series forms, some FC branch roads, cut-in and cut-off contactor and bypass contactors more; Wherein often organize thyristor to be made up of two thyristor inverse parallels; FC branch road is formed primarily of high-voltage capacitor, reactor, discharge coil and lightning arrester; Every bar FC branch road front end correspondence is configured with a cut-in and cut-off contactor; Each cut-in and cut-off contactor to there being a bypass contactor, after each cut-in and cut-off contactor is connected with thyristor controlled series compensation respectively, the bypass contactor corresponding with it in parallel, and then access electrical network; The reactive power of voltage and current also needed for calculating of controller detection of grid side, to send triggering signal to thyristor controlled series compensation, controls cut-in and cut-off contactor and/or bypass contactor divide-shut brake simultaneously.
Control a method for the high-pressure electronic switching device of described operating passing zero multiple unit capacitor, comprise following rate-determining steps:
A. close a floodgate: according to requirement in practical systems, one or several in closed cut-in and cut-off contactor; Thyristor controlled series compensation conducting, drops into the FC branch road corresponding with described closed cut-in and cut-off contactor;
B. bypass runs: after thyristor controlled series compensation conducting 1,2 cycles, drops into corresponding with described closed cut-in and cut-off contactor bypass contactor; Controller stops sending triggering signal to thyristor controlled series compensation, and thyristor controlled series compensation is in cut-off state; Described closed cut-in and cut-off contactor separating brake, realize FC branch road quick, drop into without inrush current;
C. newly-increased FC branch road runs: closed by the cut-in and cut-off contactor corresponding with required newly-increased FC branch road; The thyristor controlled series compensation being in idle condition receives the triggering signal sent by controller again, thyristor controlled series compensation conducting, realizes putting into operation without impacting of required newly-increased FC branch road; After thyristor controlled series compensation conducting 1,2 cycles, drop into the bypass contactor corresponding with required newly-increased FC branch road; Controller stops sending triggering signal to thyristor controlled series compensation, and thyristor controlled series compensation is in cut-off state; The cut-in and cut-off contactor separating brake corresponding with required newly-increased FC branch road;
D. out of service: the closed cut-in and cut-off contactor dropped in step a, the separating brake when step b, out of service time, need again to drop into described cut-in and cut-off contactor; Again after dropping into described cut-in and cut-off contactor, thyristor controlled series compensation receives the triggering signal that controller sends, thyristor controlled series compensation conducting; The bypass contactor separating brake corresponding with the above-mentioned cut-in and cut-off contactor again dropped into; Controller stops sending triggering signal to thyristor controlled series compensation, and thyristor controlled series compensation ends; The above-mentioned cut-in and cut-off contactor again dropped into separating brake again, what realize the FC branch road of all inputs before is out of service.
The beneficial effect of the invention is:
1, by adopting a set of thyristor controlled series compensation just can realize in not flexible switching multiple unit capacitor function in the same time, to meet system Rapid Variable Design reactive requirement;
2, owing to arranging novel electron switch in this device, be at thyristor controlled series compensation bypass contactor in parallel with the two ends of cut-in and cut-off contactor series arm, after thyristor controlled series compensation conducting 1-2 cycle, bypass contactor closes a floodgate, and avoids thyristor controlled series compensation and is in and drops into the phenomenon that loss is large, caloric value is large that causes of state always;
3, because of the not bringing onto load of cut-in and cut-off contactor during switched capacitor, the electrical endurance of equipment is greatly extended, and ensure that equipment and personal safety;
4, this device can realize no-flashy-flow, without overvoltage, to Capacitor banks harmless, can frequent switching, advanced technology, cost performance are high, good reliability, remarkable in economical benefits, can be widely used in 10kV transformer station and need frequent switching couple capacitors electrical network to carry out the field of reactive power compensation as steel-making, steel rolling etc.;
5, by controlling thyristor controlled series compensation, cut-in and cut-off contactor and bypass contactor divide-shut brake, realize flexible, quick, no-flashy-flow, the low-loss switching to multiple unit capacitor, extend the electric equipment life-span, compared with only controlling the method for a Capacitor banks with a tradition electronic switch, this device greatly reduces cost of investment, ensure that the reliable and stable operation of system, be adapted to the field that Rapid Variable Design as idle in harbour, colliery etc. is fast.
Accompanying drawing explanation
Accompanying drawing is utilized to be described further innovation and creation, but the embodiment in accompanying drawing does not form any restriction to the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the following drawings.
Fig. 1 is the structural representation of the tandem type electronic switching circuit of a kind of opening-closing capacitor bank of prior art.
Fig. 2 is the structural representation of the Lossless intelligent switching device for high-voltage capacitor bank of prior art.
Fig. 3 is the structural representation of the high-pressure electronic switching device of a kind of operating passing zero multiple unit capacitor of the invention.
Fig. 4 is the structural representation of the FC branch road of the invention.
Fig. 5 is the work operational flow diagram of the invention.
Embodiment
With the following Examples the invention is further described.
See Fig. 3, the high-pressure electronic switching device of a kind of operating passing zero multiple unit capacitor of the invention mainly comprises controller, by organizing the thyristor controlled series compensation that Thyristors in series forms, some FC branch roads, cut-in and cut-off contactor and bypass contactors more.
The thyristor groups number that described thyristor controlled series compensation is connected is determined by system voltage, often organize thyristor to be made up of two thyristor inverse parallels, it adopts controller to carry out automatic switching, replace the mechanical switch of transmission, can realize dropping into without inrush current and current over-zero excises, without arc reignition, thus substantially solve mechanical switch contact and be subject to arcing and the unfavorable condition damaged, fast response time, can be used for the application scenario of rapid fluctuations change, impingement, nonlinear-load.
Described FC branch road is formed primarily of high-voltage capacitor C, reactor L, discharge coil TV and lightning arrester FV; as shown in Figure 4; its branch road number n and protected mode are all determined, different FC branch road FC11 branch road, FC12 branch road according to detailed programs demand ... FC1n branch road carrys out distinguishing identifier.
Be configured with a cut-in and cut-off contactor in the equal correspondence in front end of every bar FC branch road, its quantity is decided by FC branch road number n, different cut-in and cut-off contactor KM11, KM12 ... KM1n etc. carry out distinguishing identifier.
Described each cut-in and cut-off contactor is also correspondingly to there being a bypass contactor, different bypass contactors uses KM21, KM22 in the drawings ... KM2n etc. carry out distinguishing identifier, wherein, bypass contactor KM21, KM22 ... KM2n is corresponding in turn to cut-in and cut-off contactor KM11, KM12 ... KM1n, after each cut-in and cut-off contactor is connected with thyristor controlled series compensation respectively, in parallel corresponding with it bypass contactor, and then access electrical network.
Described controller, by the voltage and current of detection of grid side, then calculates required reactive power, sends triggering signal to thyristor controlled series compensation, controls cut-in and cut-off contactor and/or bypass contactor divide-shut brake simultaneously.
By controlling thyristor controlled series compensation, cut-in and cut-off contactor and bypass contactor divide-shut brake, feasible system is to flexible, quick, no-flashy-flow, low-loss switching of multiple unit capacitor.
See Fig. 5, running starts, and first-selection carries out parameter initialization to controller, then constantly calculates required reactive power Q by controller
s(t1 moment), when the reactive power Q calculated
sfor perception idle time, drop into required FC branch road, the concrete step that drops into comprises:
A. close a floodgate: according to requirement in practical systems, closed cut-in and cut-off contactor KM11, KM12 ... one or several of KM1n; Thyristor controlled series compensation conducting, drops into the FC branch road of desired volume;
B. bypass runs: after thyristor controlled series compensation conducting 1,2 cycles, drops into corresponding bypass contactor KM21, KM22 ... KM2n; Controller stops sending triggering signal to thyristor controlled series compensation, and thyristor controlled series compensation is in cut-off state; The cut-in and cut-off contactor separating brake that is closed in step a closes a floodgate, complete corresponding FC branch road quick, drop into without inrush current;
After input, reactive power Q needed for computing system again
s(t2 moment), now, if reactive power Q
sstill be perceptual idle time, consider newly-increased FC branch road, concrete newly-increased method adopts step c;
C. newly-increased FC branch road runs: choose required newly-increased FC branch road by the FC branch road do not dropped in step a combined floodgate, and closed cut-in and cut-off contactor corresponding thereto; The thyristor controlled series compensation being in idle condition receives the triggering signal sent by controller again, and thyristor controlled series compensation is conducting again, completes putting into operation without impacting of required newly-increased FC branch road; After thyristor controlled series compensation conducting 1,2 cycles, drop into the bypass contactor corresponding with required newly-increased FC branch road; Controller stops sending triggering signal to thyristor controlled series compensation, and thyristor controlled series compensation is in cut-off state; The cut-in and cut-off contactor separating brake corresponding with required newly-increased FC branch road;
Reactive power Q needed for the system of recalculating is got back to again after newly-increased FC branch road
s(t1 moment);
If at reactive power Q needed for computing system again
stime (t2 moment), the reactive power Q calculated
sbe not perceptual idle but capacitive reactive power, now need out of service, concrete grammar is as following steps d;
D. out of service: the closed cut-in and cut-off contactor dropped in step a, is now all in gate-dividing state, when out of service, needs again to drop into described cut-in and cut-off contactor; Then, thyristor controlled series compensation receives the triggering signal that controller sends, and thyristor controlled series compensation is conducting again; Then, corresponding with the above-mentioned cut-in and cut-off contactor again dropped into bypass contactor separating brake; Controller stops sending triggering signal to thyristor controlled series compensation, and thyristor controlled series compensation ends; Finally, the above-mentioned cut-in and cut-off contactor again dropped into separating brake again, what complete the FC branch road of all inputs before is out of service;
Reactive power Q needed for the system of recalculating is got back to again after out of service
s(t1 moment);
If at reactive power reactive power Q needed for computing system again
stime (t2 moment), the reactive power Q calculated
sneither perception is idle neither capacitive reactive power, namely return to reactive power Q needed for the system of recalculating
s(t1 moment);
Due to all not bringing onto load operations in switching process of cut-in and cut-off contactor and bypass contactor, thus extend the useful life of electric equipment, protect electronic switch.
Finally should be noted that; above embodiment is only in order to illustrate the technical scheme of the invention; but not the restriction to the invention protection range; although done to explain to the invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to the technical scheme of the invention or equivalent replacement, and not depart from essence and the scope of the invention technical scheme.
Claims (2)
1. a high-pressure electronic switching device for operating passing zero multiple unit capacitor, is characterized in that, described switching device comprises controller, by organizing the thyristor controlled series compensation that Thyristors in series forms, some FC branch roads, cut-in and cut-off contactor and bypass contactors more; Wherein often organize thyristor to be made up of two thyristor inverse parallels; Described FC branch road is formed primarily of high-voltage capacitor, reactor, discharge coil and lightning arrester; Every bar FC branch road front end correspondence is configured with a cut-in and cut-off contactor; Each cut-in and cut-off contactor to there being a bypass contactor, after each cut-in and cut-off contactor is connected with thyristor controlled series compensation respectively, the bypass contactor corresponding with it in parallel, and then access electrical network; The reactive power of voltage and current also needed for calculating of controller detection of grid side, to send triggering signal to thyristor controlled series compensation, controls cut-in and cut-off contactor and/or bypass contactor divide-shut brake simultaneously.
2. a control method for high-pressure electronic switching device according to claim 1, is characterized in that, described control method comprises following rate-determining steps:
A. close a floodgate: according to requirement in practical systems, one or several in closed cut-in and cut-off contactor; Thyristor controlled series compensation conducting, drops into the FC branch road corresponding with described closed cut-in and cut-off contactor;
B. bypass runs: after thyristor controlled series compensation conducting 1,2 cycles, drops into corresponding with described closed cut-in and cut-off contactor bypass contactor; Controller stops sending triggering signal to thyristor controlled series compensation, and thyristor controlled series compensation is in cut-off state; Described closed cut-in and cut-off contactor separating brake, realize FC branch road quick, drop into without inrush current;
C. newly-increased FC branch road runs: closed by the cut-in and cut-off contactor corresponding with required newly-increased FC branch road; The thyristor controlled series compensation being in idle condition receives the triggering signal sent by controller again, thyristor controlled series compensation conducting, realizes putting into operation without impacting of required newly-increased FC branch road; After thyristor controlled series compensation conducting 1,2 cycles, drop into the bypass contactor corresponding with required newly-increased FC branch road; Controller stops sending triggering signal to thyristor controlled series compensation, and thyristor controlled series compensation is in cut-off state; The cut-in and cut-off contactor separating brake corresponding with required newly-increased FC branch road;
D. out of service: the closed cut-in and cut-off contactor dropped in step a, the separating brake when step b, out of service time, need again to drop into described cut-in and cut-off contactor; Again after dropping into described cut-in and cut-off contactor, thyristor controlled series compensation receives the triggering signal that controller sends, thyristor controlled series compensation conducting; The bypass contactor separating brake corresponding with the above-mentioned cut-in and cut-off contactor again dropped into; Controller stops sending triggering signal to thyristor controlled series compensation, and thyristor controlled series compensation ends; The above-mentioned cut-in and cut-off contactor again dropped into separating brake again, what realize the FC branch road of all inputs before is out of service.
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| CN201410612740.0A CN104410079B (en) | 2014-11-04 | 2014-11-04 | A kind of high-pressure electronic switching device and control method thereof of operating passing zero multiple unit capacitor |
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| CN201410612740.0A CN104410079B (en) | 2014-11-04 | 2014-11-04 | A kind of high-pressure electronic switching device and control method thereof of operating passing zero multiple unit capacitor |
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| CN104410079B CN104410079B (en) | 2016-05-04 |
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| KR20120033636A (en) * | 2010-09-30 | 2012-04-09 | 한국전력공사 | Asymmetrical reactive power compensator and method thereof |
| CN102522758A (en) * | 2011-12-27 | 2012-06-27 | 郑州建豪电器技术有限公司 | Lossless intelligent switching device for high-voltage capacitor bank |
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| CN103219734A (en) * | 2013-04-27 | 2013-07-24 | 无锡赛晶电力电容器有限公司 | Intelligent type reactive compensation system |
| CN103248280A (en) * | 2013-05-16 | 2013-08-14 | 宁波理工电力电子设备有限公司 | TCR soft start and SVC dynamic reactive power compensation device and soft start and dynamic reactive power compensation method |
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Patent Citations (7)
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| KR20120033636A (en) * | 2010-09-30 | 2012-04-09 | 한국전력공사 | Asymmetrical reactive power compensator and method thereof |
| CN102354994A (en) * | 2011-10-09 | 2012-02-15 | 国船电气（武汉）有限公司 | MCR (magnetically controlled reactor) soft start and SVC (static VAR compensator) dynamic reactive compensation device as well as soft start and dynamic reactive compensation method |
| CN102522758A (en) * | 2011-12-27 | 2012-06-27 | 郑州建豪电器技术有限公司 | Lossless intelligent switching device for high-voltage capacitor bank |
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