CN201549871U - Failure detection and protection device for SVC system - Google Patents
Failure detection and protection device for SVC system Download PDFInfo
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- CN201549871U CN201549871U CN2009202797747U CN200920279774U CN201549871U CN 201549871 U CN201549871 U CN 201549871U CN 2009202797747 U CN2009202797747 U CN 2009202797747U CN 200920279774 U CN200920279774 U CN 200920279774U CN 201549871 U CN201549871 U CN 201549871U
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The utility model relates to a failure detection and protection device for SVC systems, which relates to a dynamic reactive power compensation system. The failure detection and protection device consists of a signal acquisition unit, a single-chip control unit, a CAN communication unit, a failure detection-protection and trigger-pulse drive unit, a thyristor valve block and a photoelectrical isolated unit. The utility model is characterized in that voltage and current are transmitted to a CPU processor by the acquisition unit to send a trigger pulse; data is collected by the photoelectrical isolated unit; when a serious failure is judged, the trigger pulse is shut down and the thyristor valve block and other high-voltage devices are protected; and alarm signals of failures such as voltage shortage of the CAN bus, BOD, excess temperature and the like are uploaded to the CPU processor. The device effectively solves the problems such as delayed protection, inaccurate indication of failure signals, malfunction of the traditional system and the like, and simultaneously saves cost, reduces on-site installation workload and greatly improves the operation stability and safety of the system.
Description
Technical field
The utility model relates to a kind of dynamic passive compensation system, belongs to the flexible AC transmission technical field, is specifically related to the fault detect/protective device of a kind of SVC of being used for system.
Background technology
In recent years, along with the continuous increase of high-power nonlinear-load, the reactive power impact of electrical network and harmonic pollution are the trend of continuous rising, cause the distortion or the three-phase imbalance of voltage, electric current, problem such as power factor is on the low side.In order to address the above problem Static Type Dynamic Reactive Compensation Device (SVC) can be installed, the SVC device has been successfully applied in the compensation of impact loads such as metallurgy, mining and electric railway at present, be characterized in: governing speed is fast, and can be continuously, phase-splitting carry out reactive power regulate, reliable, applied widely, therefore to power system voltage stabilization with improve the quality of power supply and played tangible effect.Yet; because the operating voltage grade of SVC is higher; be generally 10KV, 27.5KV or 35KV; power electronic equipment wherein will bear very high voltage; and power electronic equipment is again the Primary Component among the whole SVC; determined a whole set of SVC device to move safely and effectively, thereby, for power electronic equipment in real time, fault detect fast and the protection also just seem particularly important.
The electric pressure of thyristor commonly used is up to 7000V at present, and the connection in series-parallel of thyristor makes the main circuit of TCR and control circuit complicated more, fault detection method in the past is directly the various alarm signals of thyristor valve group to be connected with 10G CPU Control Unit by optical fiber, which kind of fault-signal by unified reception of CPU and judgement is, make corresponding action then, locking pulse, cut-out major loop or the indication of just simply reporting to the police.Its drawback is that connecting line and optical fiber use a lot, particularly in high voltage, jumbo SVC device, often need the nearly optical fiber more than 300, increased cost greatly virtually, and brought very big workload for on-the-spot installation personnel, many times because the problem of wire size sign causes the return path signal misconnection, make system failure signal misregister, system's misoperation, major loop and power device are burnt in the untimely or error protection of valve unit protection when serious; On the other hand; because interface end is too much; need add devices such as CPLD or FPGA and assist CPU work, also just increase its hardware cost and fault point accordingly, and owing to the resource that takies CPU is too much; make that the CPU workload strengthens, system handles speed is slack-off; moreover, because all faults all are to handle after being judged voluntarily by CPU again, cause the guard signal time-delay; the untimely phenomenon of protection occurs, make the long-time safety of system, stable operation become difficult.
The utility model content
Defective and deficiency at above-mentioned technical problem and prior art, the utility model aims to provide the fault detect/protective device of a kind of SVC of being used for system, when the generation systems fault, the fault detect protection system is carried out failure diagnosis and location automatically, and upload concrete fault message by the CAN bus immediately, give the alarm, after judging catastrophe failure, send guard signal, can directly excise major loop power electronic equipment or other high-tension apparatus; This device can detect the system failure apace, can effectively protect in time again, has shortened the downtime of SVC equipment greatly, has improved operating efficiency.
The technical scheme that the utility model solves the problems of the technologies described above is: the fault detect/protective device of a kind of SVC of being used for system, by signal gathering unit, the Single-chip Controlling unit, the CAN communication unit, fault detect protection and trigger impulse driver element, thyristor valve group and photoelectricity isolated location are formed, the Single-chip Controlling unit is connected with the CAN communication unit signal of telecommunication, the CAN communication unit is connected with the fault detect protection and the trigger impulse driver element signal of telecommunication, fault detect protection and trigger impulse driver element and thyristor valve group, the photoelectricity isolated location signal of telecommunication connects, it is characterized in that A/D sampling plate and collecting unit, the DSP arithmetic element signal of telecommunication connects, and the DSP arithmetic element signal of telecommunication connects control phase shift trigger board; The phase shift trigger board after photoelectricity isolated location electric light conversion again the signal of telecommunication connect fault detect protection and trigger impulse driver element; Described fault detect protection and trigger impulse driver element are connected to after driving and drive the thyristor valve group in the corresponding high potential plate.Wherein, described high potential plate also is connected to fault detect protection and trigger impulse driver element with the undervoltage warning signal and the BOD alarm signal signal of telecommunication, and it is uploaded to Single-chip Controlling unit (CPU processing unit).
Fault detect/the guard method of described SVC system is realized by following step:
(1) the A/D acquisition system is gathered electrical network three-phase voltage, current instantaneous value in real time, and transformation result sent into Single-chip Controlling unit (CPU processing unit), the CPU processing unit calculates the meritorious and reactive current of the current first-harmonic of system and sends trigger impulse, realizes that OPTIMAL REACTIVE POWER regulates.
(2) temperature sensor above the thyristor valve group is regularly sent temperature data into fault detect and protection system; judge whether overtemperature of valve group by it; simultaneously; the high potential plate is also delivered to undervoltage warning signal and BOD alarm signal in fault detect and the protection system in real time, by this system's failure judgement type and concrete fault branch.
(3) fault detect and protection system at first receive whole fault-signals by the photoelectricity isolated location; utilize the CAN bus that the real time data of these alarm signals and the valve group communication protocol by set form is sent on the CPU processing unit again, report to the police accordingly or the processing of locking pulse by the CPU processing unit.In addition, fault detect and protection system also have CAN bus self-diagnostic function, and when the CAN bus occurs when unusual, the CPU processing unit sends reset signal, restarts the CAN bus.
(4) fault detect and protection system also receive trigger impulse that the CPU processing unit sends simultaneously and amplify by self drive circuit after send into the high potential plate to trigger the thyristor valve group.When trigger impulse was unusual, fault detect and protection system can be uploaded to the CPU processing unit with this fault message by the CAN bus immediately, and simultaneously, protection system is sent block signal and blocked trigger impulse.In addition; fault detect and protection system are carried out real time fail and are patrolled and examined; when serious problems appear in the valve group; during as faults such as overcurrent, thyristor punctures; protection system also can be blocked trigger impulse; send switching signal simultaneously, control I/O excises the major loop high-tension apparatus in the unit, thereby has improved the safe operation coefficient of SVC system significantly.
Described CAN bus is that a kind of framework is open, new generation network communication protocol broadcast type, that can effectively support distributed control and real-time control, it has, and transmission speed solves bus contention soon, automatically, real-time is good, reliability is high, error correcting capability is strong, easy to connect and plurality of advantages such as cost performance height, in addition, the CAN bus can multimode work, on the network any one node all can be at any time on one's own initiative the node of other on network send information, and be regardless of the principal and subordinate, between the node priority can be set, thereby communication mode is flexible; The CAN bus has adopted non-destructive position arbitration technique, when two nodes send information simultaneously on network,, saved the bus collision arbitration time according to priority orders transmission data, and under the very heavy situation of offered load, the situation of network paralysis can not appear also.
Owing to adopted the CAN bussing technique, saved a large amount of optical fiber, reduced failure rate simultaneously, improved data transmission bauds, fundamentally improved the reliability of whole SVC equipment.
The utility model also has some technical characterictics like this: described single chip circuit is AT90CAN128, be a 8 single-chip microcomputers of Atmel company, inside has 10 high-speed a/d converters of the single-ended or difference input of one 8 passage, and have 1 CAN control unit interface that meets 2.0A or 2.0B, be a high-performance single-chip microcomputer.The CAN transceiver adopts the PCA82C251 of PHILIPS Co., supports CAN2.0A and CAN2.0B, has 2 independent CAN passages, at least can connect 110 nodes, high-speed transfer can reach 1Mbps, and each port has transmission state LED indication, and electromagnetic interference is had higher anti-interference.Optical fiber driving circuit adopts the SN75451 of TI company, has the characteristics of Low ESR, high current rate, avoids producing long conditions of streaking.
Technique effect of the present utility model is:
(1) fault detect and protection system can receive the real time data of whole fault amounts and valve group outbalance, and can carry out Fault analytical according to data message and warning limit value.Possess overcurrent, under-voltage, BOD, overtemperature, lose fault alarm analytical capabilities such as pulse, also have CAN bus failure self-diagnosing function simultaneously, for system's long-time running provides powerful safety guarantee.
(2) fault detect and protection system are in reception, resolution system fault; also the All Alerts data are passed to the CPU processing unit by the CAN bus with packet in form; substituted up to a hundred optical fiber in the past with a twisted-pair feeder; saved cost widely; reduced field erected workload; correspondingly also reduced failure rate, the SVC system stable operation has been become be more prone to.
(3) the CPU processing unit in the controller directly receives the fault message after fault detect and protection system are decomposed; do not need to add other additional device and help CPU resolve fault information; reduced the relevant hardware cost; simultaneously also avoided taking the CPU excess resource; reduced the workload of CPU; accelerate the processing speed of system, made SVC system control precision and reliability greatly promote.
(4) fault detect and protection system have oneself's judgement defencive function; when judging catastrophe failures such as system's overcurrent or thyristor puncture; can send block signal and block trigger impulse; and send control signal control I/O unit and excise the major loop high-tension apparatus; simultaneously, upload concrete fault message by the CAN bus, its traffic rate reaches as high as 1Mbps; and the error rate is extremely low, has really accomplished the quick response and the protection of system.
Description of drawings
Fig. 1 is a SVC system control principle block diagram;
Fig. 2 is that fault detects the protected location circuit connection diagram;
Fig. 3 is that fault detects the protected location program flow diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described:
As shown in Figure 1, after at first signal gathering unit is passed through AD sampling plate sample conversion with system voltage, current signal, send into the DSP arithmetic element and carry out computing, the DSP arithmetic element calculates the instantaneous reactive power of current electrical network according to electrical network parameter, and sends control signal and give the phase shift trigger board; The phase shift trigger board at first forms high-frequency impulse; again with the three-phase triggering signal after photoelectric isolating circuit carries out electric light conversion; be sent in fault detect protection and the trigger impulse driver element by optical fiber; this unit is sent in the corresponding high potential plate trigger impulse to drive three-phase thyristor valve group after overdriving; and the temperature sensor above the valve group can be sent into temperature value the fault detect protected location; judge whether to surpass the limiting temperature value voluntarily by this unit; the high potential plate also is sent to undervoltage warning signal and BOD alarm signal in the fault detect protected location by optical fiber simultaneously; after the fault detect protected location connects together by the CAN bus on the plate; together these alarm signals and temperature value are passed in the CPU processing unit; the CPU processing unit also will be imported with switching value; output unit connects; carry out corresponding I/O control and receive operations such as TCR current signal and liquid crystal keyboard signal; the CPU processing unit also provides the remote operation interface in addition, so that the various real time datas in scene are passed to upper industrial computer.
Fault detect protection and trigger impulse driver element (as Fig. 2) at first receive the light pulse triggering signal TP+ from the phase shift trigger board, TP-, after negative circuit 74HC04 is anti-phase, form the multichannel triggering signal, after every road triggering signal drives through optical fiber driving circuit SN75451 again, HFBR1533 sends through fiber optic transmitter, trigger three-phase thyristor valve group to drive each road high potential plate, single chip computer AT 90CAN128 also will monitor in real time to this three-phase triggering signal simultaneously, when if the unusual or disappearance of trigger impulse occurring, single chip computer AT 90CAN128 can send and lose the pulse alarm signal, and together be uploaded to the CPU processing unit with other fault-signal, block trigger impulse simultaneously, prevent the damage of thyristor loop; The fault detect protected location receives under-voltage from each the road temperature value of thyristor valve group and Ge Lu high potential plate through fiber optic receiver HFBR1521 on the other hand; the BOD alarm signal; which phase valve group single chip computer AT 90CAN128 can judge according to temperature limit exceeds temperature range; utilize fixing communication protocol to parse concrete fault branch and fault type simultaneously; after at last that these are concrete fault message carries out the photoelectricity isolation through high speed photo coupling 6N137; by CAN transceiver PCA82C251; be sent on the CAN bus of CPU processing unit; thereby a large amount of optical fiber and cpu resource have been saved; and CAN bus transfer rate height; the error rate is low, has accelerated the computing and the processing speed of system widely.Moreover; when if the fault detect protected location is judged catastrophe failure such as system's overcurrent, thyristor puncture; can block trigger impulse voluntarily; simultaneously high pressure is excised signal after overdrive circuit 74LS245 drives amplification; send into the switching value output unit; with excision major loop high-tension apparatus, greatly improved the reliability of system.
Fault detect protected location CPU adopts the AT90CAN128 of Atmel company, and its inside has the CAN controller, is programming language with the C language, in conjunction with self-defining communication protocol, has realized the fast resolving and the transmission of alert data.
(as shown in Figure 3) program is at first carried out power-up initializing, initialization single-chip microcomputer internal resource and CAN controller, wait for that then going up the bit CPU processing unit sends the instruction of calling fault, patrol and examine instruction if receive the valve group, then upload the real-time status of thyristor valve group, if receive the fault detect work order, that system then carries out is under-voltage, BOD, overtemperature, lose the detection of faults such as pulse, and to judge the concrete fault branch of three-phase, otherwise, if that receives host computer stops fault detect instruction, then close under-voltage, BOD, overtemperature, lose the pulse detection function.
When the fault detect protected location detects fault feedback signal from the high potential plate, postpone to judge, so that parse concrete fault type, if after time-delay, fault-signal still is a low level, then think under-voltage fault alarm, and this fault message is uploaded to the bit CPU processing unit; If fault-signal becomes high level, then think the BOD fault alarm, system also can be uploaded to the bit CPU processing unit with this fault message.
When the fault detect protected location detects fault feedback signal from the valve group; judge at first whether measured temperature is within the undesired value range; when if temperature value surpasses the default limit value; then think the overtemperature fault alarm; this fault message is uploaded to the bit CPU processing unit, simultaneously with the monolithic counter zero clearing.System uploads the actual temp value subsequently.
The fault detect protected location receives the light pulse triggering signal from the phase shift trigger board; drive the high potential plate and trigger three-phase thyristor valve group; and the three-phase triggering signal monitored in real time; when if the unusual or disappearance of trigger impulse occurring; to lose the pulse fault alarm information and be uploaded to the bit CPU processing unit, and parse concrete fault loop.
When the fault detect protected location detects when losing the fault that pulse, under-voltage, BOD report to the police etc. serious; block trigger impulse and concrete fault message is uploaded to the bit CPU processing unit on the one hand; on the other hand; send control signal; control I/O unit excision major loop high-tension apparatus; the protection electric equipment prevents the damage of thyristor loop.
The utility model has solved problems such as SVC unit protection in the past is untimely, fault-signal misregister, system's misoperation effectively; greatly saved simultaneously hardware cost; reduce the on-site installation work amount, had warning accuracy height, fast, low-cost, the safe and reliable to operation characteristics of protection response.
Above execution mode is only for the usefulness that the utility model is described; but not to restriction of the present utility model; those skilled in the art; under the situation that does not break away from spirit of the present utility model and scope; the technical scheme of making various equivalents or variation belongs to protection category of the present utility model, by every claim restriction.
Claims (2)
1. fault detect/protective device that is used for the SVC system, form by signal gathering unit, Single-chip Controlling unit, CAN communication unit, fault detect protection and trigger impulse driver element, thyristor valve group and photoelectricity isolated location, it is characterized in that the Single-chip Controlling unit is connected with the CAN communication unit signal of telecommunication, the CAN communication unit is connected with the fault detect protection and the trigger impulse driver element signal of telecommunication, and fault detect protection and trigger impulse driver element are connected with thyristor valve group, the photoelectricity isolated location signal of telecommunication; Wherein, the A/D sampling plate is connected with collecting unit, the DSP arithmetic element signal of telecommunication, and the DSP arithmetic element signal of telecommunication connects control phase shift trigger board; The phase shift trigger board after photoelectricity isolated location electric light conversion again the signal of telecommunication connect fault detect protection and trigger impulse driver element; Described fault detect protection and trigger impulse driver element are connected to after driving and drive the thyristor valve group in the corresponding high potential plate.
2. a kind of fault detect/protective device that is used for the SVC system according to claim 1; it is characterized in that described high potential plate also is connected to fault detect protection and trigger impulse driver element with the undervoltage warning signal and the BOD alarm signal signal of telecommunication, and it is uploaded to the Single-chip Controlling unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202797747U CN201549871U (en) | 2009-11-16 | 2009-11-16 | Failure detection and protection device for SVC system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202797747U CN201549871U (en) | 2009-11-16 | 2009-11-16 | Failure detection and protection device for SVC system |
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| CN201549871U true CN201549871U (en) | 2010-08-11 |
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| CN2009202797747U Expired - Lifetime CN201549871U (en) | 2009-11-16 | 2009-11-16 | Failure detection and protection device for SVC system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353637A (en) * | 2016-08-19 | 2017-01-25 | 国家电网公司 | Method for fault analysis and location of thyristor controlled reactor of static var compensator |
| CN108089567A (en) * | 2017-12-11 | 2018-05-29 | 成都运达科技股份有限公司 | A kind of semiconductor dry and wet contact fault diagnosis circuit and diagnostic method |
-
2009
- 2009-11-16 CN CN2009202797747U patent/CN201549871U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353637A (en) * | 2016-08-19 | 2017-01-25 | 国家电网公司 | Method for fault analysis and location of thyristor controlled reactor of static var compensator |
| CN106353637B (en) * | 2016-08-19 | 2019-03-12 | 国家电网公司 | Static Var Compensator thyristor-controlled reactor accident analysis localization method |
| CN108089567A (en) * | 2017-12-11 | 2018-05-29 | 成都运达科技股份有限公司 | A kind of semiconductor dry and wet contact fault diagnosis circuit and diagnostic method |
| CN108089567B (en) * | 2017-12-11 | 2019-12-10 | 成都运达科技股份有限公司 | Semiconductor dry-wet contact fault diagnosis circuit and diagnosis method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100811 Effective date of abandoning: 20091116 |