CN102354963A - Fast triggering system of resonant current limiter thyristor valve and working method of fast triggering system - Google Patents
Fast triggering system of resonant current limiter thyristor valve and working method of fast triggering system Download PDFInfo
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- CN102354963A CN102354963A CN2011102520863A CN201110252086A CN102354963A CN 102354963 A CN102354963 A CN 102354963A CN 2011102520863 A CN2011102520863 A CN 2011102520863A CN 201110252086 A CN201110252086 A CN 201110252086A CN 102354963 A CN102354963 A CN 102354963A
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Abstract
The invention relates to a fast triggering system of a resonant current limiter thyristor valve and a working method of the fast triggering system. The system mainly comprises a sampling module, a controller, a clock circuit, a triggering unit and an alarm circuit, wherein the sampling module is used for sampling line current and resonance voltage difference signal at high speed; the clock circuit is used for providing an overall clock signal and providing a reference time for the system; and the controller is used for realizing a fault recognition logic matching scheme by adopting a field programmable technology and converting a criteria signal into a thyristor valve triggering signal. A model experiment indicates that the resonance voltage difference recognition method can provide a criteria output signal within 1ms. The fast triggering system disclosed by the invention has the advantages of fast recognizing short-circuit fault and avoiding faults, such as switch reclosing, system disconnection, and the like.
Description
Technical field
The present invention relates to field of power, particularly a kind of mode of resonance flow restricter thyristor valve rapid triggering system and method for work.
Background technology
Big load center short circuit current exceeds standard becomes the key factor of restriction power network development.The series resonance-type flow restricter becomes the practicability flow restricter that is applied to the 500kV supergrid because of principle is simple, safe and reliable, economical rationality.Series resonance-type flow restricter principle is following: the current-limiting reactor capacitor of industrial frequency resonance with it of connecting; During short trouble, capacitor is equivalent to the current-limiting reactor input by bypass fast.The key that realizes flow restricter active current-limiting function is the quick bypass of capacitor.The bypass circuit responsiveness has determined flow restricter to drop into speed, and the reduction of the insulation coordination of bypass circuit high speed closed pair device, overvoltage protection, the through-flow level of circuit is all very favourable in addition.
The rapid triggering system is the key link of flow restricter bypass circuit.The protection criterion of triggering system depends on amplitude of short circuit and current differential value.This protection criterion has high reliability on engineering, still have difficulties but the triggered time reaches 5 milliseconds, and is former because following aspect:
1, short trouble recognition methods speed is fast not enough.Current amplitude and rate of change can directly embody fault message fast, but current amplitude receives the influence of fault phase and distance, and current changing rate receives the interference of high-frequency noise easily.In order to prevent erroneous judgement, the criterion threshold setting is than higher, and will repeatedly relatively confirm, influenced the protection criterion outlet time.
2, the signal transmission link is too much, causes certain delay.Patent " a kind of thyristor valve trigger of fault current limiter and monitoring system " has proposed thyristor valve trigger and monitoring coded system.Host computer sends triggering signal and gives valve base electronic device (VBE), and VBE is transmitted to trigger board again, and trigger board is sent trigger impulse and given thyristor valve.Signals transmission is through links such as detection, communication, analog-to-digital conversion, short circuit current identification, pulse codes.Because signal will transmit at high electronegative potential platform, the time of implementation flower is too much on the communication link.
Summary of the invention
The present invention be directed to the flow restricter speed of devoting oneself to work and to satisfy the problem of system, proposed a kind of mode of resonance flow restricter thyristor valve rapid triggering system and method for work, have quick-action property preferably and reliability.
Technical scheme of the present invention is: a kind of mode of resonance flow restricter thyristor valve rapid triggering system; Comprise sampling module, controller, clock circuit, trigger element and warning circuit, sampling module adopts the high-speed parallel analog to digital converter, after sampling module sampling circuit electric current resonant voltage differential signal carries out analog-to-digital conversion; Signal sent into carry out logical process in the controller; Output a control signal to trigger element, trigger element outputs to controlled thyristor, exports signal simultaneously to warning circuit; Clock circuit is that controller provides clock signal, and controller outputs a control signal to sampling module and starts sampling.
It is high-speed parallel AD conversion chip that said sampling module is selected sampling A for use, and controller is selected the FPGA programmable gate array chip for use.
A kind of mode of resonance flow restricter thyristor valve rapid triggering system works method; It is characterized in that; When having electric current to flow through in the resonant element; If the resonance potential difference reaches the threshold value of action, resonance potential difference and short circuit current criterion are through constituting the short trouble signal behind the logical AND gate, and this signal is through converting the conducting of thyristor valve trigger signal rapid triggering flow restricter thyristor to; When the resonance potential difference reached the action threshold value but do not have electric current to flow through in the current element, promptly electric current criterion resonant voltage difference judged result behind an inverter constituted the disconnection fault outlet through a logical AND gate again, and the output of open circuit fault signal sends warning signal; In the reclosing process,, when waiting flow restricter resonating device voltage difference to decay under the judgement operating value, open resonance potential difference criterion with the locking of resonance potential difference criterion.
Beneficial effect of the present invention is: mode of resonance flow restricter thyristor valve rapid triggering system of the present invention and method of work, have quick-action property preferably and sensitivity, and guarantee the safety while of system, to further developing of electrical network technical assurance is provided.
Description of drawings
Fig. 1 is a mode of resonance flow restricter thyristor valve rapid triggering systematic schematic diagram of the present invention;
Fig. 2 is a mode of resonance flow restricter thyristor valve rapid triggering system circuit diagram of the present invention;
Fig. 3 is a mode of resonance flow restricter thyristor valve rapid triggering system logic system block diagram of the present invention;
Fig. 4 is a mode of resonance flow restricter thyristor valve rapid triggering system experimentation main circuit diagram of the present invention;
Fig. 5 is a mode of resonance flow restricter thyristor valve rapid triggering system hardware circuit diagram of the present invention;
Fig. 6 is a mode of resonance flow restricter thyristor valve rapid triggering systems soft ware flow chart of the present invention;
Fig. 7 is a mode of resonance flow restricter thyristor valve rapid triggering system resonance voltage difference oscillogram of the present invention;
Fig. 8 is mode of resonance flow restricter thyristor valve rapid triggering of the present invention system criterion outlet time statistical chart.
Embodiment
Flow restricter body fault-signal refers to short circuit current signal, resonant capacitance voltage signal and current-limiting reactor voltage signal.The body fault-signal gets into the recognition unit module after transducer adopts.What identification module adopted is resonance potential difference method for quickly identifying.After short trouble is judged in recognition methods, send the criterion signal and trigger and monitoring means to photoelectricity, trigger element sends triggering signal and gives thyristor electronic board TE, and the TE plate sends triggering signal again and gives thyristor, makes the thyristor action, systematic schematic diagram as shown in Figure 1.
Because the current limiting element industrial frequency resonance, current-limiting reactor voltage equates with the resonant capacitance voltage magnitude during stable state, and is in the opposite direction, so the difference of both scalars is 0.During short circuit; Make inductance voltage value undergo mutation because aperiodic component exists, and the electric capacity voltage is almost constant, thereby causes that bigger saltus step takes place the resonant element voltage difference; Because the saltus step amplitude is relatively large, this signal can be used as the reliable basis of fault judgement.Resonance potential difference method has two big advantages: 1, the resonance potential difference method size that is affected by other factors minimum resonance potential difference method exists this characteristic of aperiodic component to cause by short circuit current, does not receive the interference of other factors basically.2, resonance potential difference method setting value is less.After short trouble took place, it was the process of growing out of nothing that the resonance potential difference is close to, thereby this criterion has quick-action property preferably and sensitivity.
The rapid triggering system utilizes the characteristic of programmable hardware technology (FPGA programmable gate array) processing logic function, signal processing is concentrated on the trigger board accomplish, and can effectively save the expense that signal transmits, and has improved the rapidity and the reliability of triggering system.System is mainly by sampling module, timer, logic judgment module, and composition such as signal conversion module.Sampling module high-speed sampling line current, resonance potential difference signal; Timer provides the global clock signal, for system provides a fiducial time; Logic judgment module realizes Fault Identification logic coordinated scheme, and this module belongs to the software engineering in the Programmable Technology; Signal conversion module becomes the thyristor valve trigger signal with the criterion conversion of signals.Model experiment shows that the recognition methods of resonance potential difference can provide criterion outlet signal in 1ms.
The triggering system core component is a logic judgment module.When system broke, it is poor that the resonating device two ends can resonance potential occur equally, and therefore, this criterion can't be avoided the influence of broken string to fault judgement, and the resonance potential difference need cooperate with the short circuit current criterion.Circuit breaker is in the reclosing process, because the capacitor port voltage does not discharge fully, resonance potential difference criterion also can be judged by accident, therefore need match with the breaker closing signal.
This module implementation is following: 1, when having electric current to flow through in the current element, if the resonance potential difference reaches the threshold value of action, then be judged to be short trouble, at this moment, this device sends the short trouble signal; When the resonance potential difference reaches the action threshold value but do not have electric current to flow through in the current element, be judged to be disconnection fault this moment.2, in the reclosing process with the locking of resonance potential difference criterion.Circuit got into stable state and waits until when flow restricter resonating device voltage difference decays under the criterion action threshold value that open again this device can be in the moment misoperation of closing a floodgate with the current limiting reactor input coefficient to guarantee the flow restricter control device after reclosing was accomplished.
Triggering system circuit diagram as shown in Figure 2.System mainly is made up of sampling module, timer, logic judging circuit, controller and signal conversion module etc.
The logic determines part is of Fig. 3, and sampling A adopts the high-speed parallel analog to digital converter, sampling circuit electric current, resonance potential difference signal, and carry out analog-to-digital conversion; Timer provides the global clock signal, and for system provides a fiducial time, counter can be with crystal oscillator or FPGA internal clock signal; Controller adopts the field-programmable device, and the enabling signal of this controller control analog to digital converter is carried out logic module processing etc., and logic determines provides the failure criterion signal, and trigger element triggers thyristor after receiving signal at once.
Fig. 3 is the logic system block diagram; Normal operation period; Resonance potential difference and electric current judged result constitute the outlet of open circuit fault after through a logical AND gate; When device is judged as system's failed because; This signal rapid triggering flow restricter thyristor conducting;
judged result resonant voltage difference judged result behind an inverter constitutes the disconnection fault outlet through a logical AND gate, when device is judged as disconnection fault, can send out a warning signal.In the combined floodgate logic determines, introduce circuit-breaker status resonance potential difference criterion is gone out atretostomia.Adopt monitoring resonance potential difference control in real time; By the time the resonance potential difference that is caused by combined floodgate decays under the criterion operating value
, escapes the influence of resonance potential difference to installing that produces by closing a floodgate.The resonance potential difference decays to below the operating value and leaves certain safety allowance under the various operational factors of desirable system of adjusting of
value.
The experiment main circuit is as shown in Figure 4.Performance time response of this experiment purpose checking rapid triggering system, so experiment condition is the small voltage electric current.Main circuit parameter is following: power supply is the adjustable alternating-current voltage source of 50V,
L=600mH, required resonant capacitance
C=16.9uF,
R=100 Ω,
S 1 ,
S 2 Be short dot.The electric capacity that satisfies experiment condition is 4.7uF, and then needing the number of shunt capacitance is 4, and resonance impedance presents capacitive.Experiment shows; Electric current 200mA during operate as normal; When joint switch S 1 closure,
but 2 times more than of saltus step to normal value.And the size of this value varies in size with experimental voltage and difference.
According to the rapid triggering system design philosophies, hardware circuit is realized as shown in Figure 5.Sampling A is selected 12 chips of AD1674 high-speed parallel, 128 points of each periodic sampling of sampling, and then sampling rate is 12.8k/s.FPGA adopts the ProASIC3 A3P060 VQG100FPGA chip of Actel company, and chip has 60K system door scale, 18kSRAM, 71 I/O.Timer is realized by the FPGA internal clocking.FPGA realizes logic determines, and AD is provided control signal.Fault provides alarm signal after taking place.
According to the logic matching relationship, the software realization flow is as shown in Figure 6.The 6.4kHz pulse control AD1674 chip of frequency divider output carries out a cycle 128 point samplings to information source.Behind the AD EOC, the result is sent into comparator and setting threshold compares.If sampled value is sent the failure criterion signal during greater than setting threshold.
Experimental threshold values is chosen, and current threshold is 150mA, and the current changing rate threshold value is 34A/s, and resonance potential difference limen value is 6.8V.Typical fault record wave-wave shape is as shown in Figure 7.The level signal of jumping among the figure is a resonance potential difference criterion outlet signal, and curve is the resonance potential difference signal.Short trouble has been done 20 groups at random, and the statistics criterion outlet time is as shown in Figure 8.Timing statistics is the result show, resonance potential difference average response time is at 0.6ms, and the current changing rate average response time is at 2ms, and the short circuit current average response time is at 6ms.
Claims (3)
1. a mode of resonance flow restricter thyristor valve rapid triggering system is characterized in that, comprises sampling module, controller, clock circuit, trigger element and warning circuit; Sampling module adopts the high-speed parallel analog to digital converter; After sampling module sampling circuit electric current resonant voltage differential signal carries out analog-to-digital conversion, signal sent into carry out logical process in the controller, output a control signal to trigger element; Trigger element outputs to controlled thyristor; Export signal simultaneously to warning circuit, clock circuit is that controller provides clock signal, and controller outputs a control signal to sampling module and starts sampling.
2. according to the said mode of resonance flow restricter of claim 1 thyristor valve rapid triggering system, it is characterized in that said sampling module is selected high-speed parallel AD conversion chip for use, controller is selected the FPGA programmable gate array chip for use.
3. mode of resonance flow restricter thyristor valve rapid triggering system works method; It is characterized in that; When having electric current to flow through in the resonant element; If the resonance potential difference reaches the threshold value of action, resonance potential difference and short circuit current criterion are through constituting the short trouble signal behind the logical AND gate, and this signal is through converting the conducting of thyristor valve trigger signal rapid triggering flow restricter thyristor to; When the resonance potential difference reached the action threshold value but do not have electric current to flow through in the current element, promptly electric current criterion resonant voltage difference judged result behind an inverter constituted the disconnection fault outlet through a logical AND gate again, and the output of open circuit fault signal sends warning signal; In the reclosing process,, when waiting flow restricter resonating device voltage difference to decay under the judgement operating value, open resonance potential difference criterion with the locking of resonance potential difference criterion.
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Cited By (5)
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| CN105571617A (en) * | 2016-01-01 | 2016-05-11 | 三峡大学 | High precision digital integrator based on Gauss algorithm |
| CN106067791A (en) * | 2016-06-06 | 2016-11-02 | 南京南瑞继保电气有限公司 | A kind of photoelectric switching circuit realizing pulse encoding and decoding |
| CN106992779A (en) * | 2015-09-23 | 2017-07-28 | 赛灵思公司 | The IP blocks of distribution network |
| CN108233347A (en) * | 2016-12-14 | 2018-06-29 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of brushless motor controller Over Current Protection System and over-current protection method |
| CN108572034A (en) * | 2018-04-24 | 2018-09-25 | 电子科技大学 | A kind of temperature sensor circuit of embedded clock |
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Cited By (9)
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|---|---|---|---|---|
| CN106992779A (en) * | 2015-09-23 | 2017-07-28 | 赛灵思公司 | The IP blocks of distribution network |
| CN106992779B (en) * | 2015-09-23 | 2021-08-13 | 赛灵思公司 | IP block of power distribution network |
| CN105571617A (en) * | 2016-01-01 | 2016-05-11 | 三峡大学 | High precision digital integrator based on Gauss algorithm |
| CN105571617B (en) * | 2016-01-01 | 2018-03-16 | 三峡大学 | A kind of high accuracy number integrator based on Gauss algorithm |
| CN106067791A (en) * | 2016-06-06 | 2016-11-02 | 南京南瑞继保电气有限公司 | A kind of photoelectric switching circuit realizing pulse encoding and decoding |
| CN106067791B (en) * | 2016-06-06 | 2018-11-23 | 南京南瑞继保电气有限公司 | A kind of photoelectric conversion circuit for realizing pulse encoding and decoding |
| CN108233347A (en) * | 2016-12-14 | 2018-06-29 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of brushless motor controller Over Current Protection System and over-current protection method |
| CN108233347B (en) * | 2016-12-14 | 2019-06-07 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of brushless motor controller Over Current Protection System and over-current protection method |
| CN108572034A (en) * | 2018-04-24 | 2018-09-25 | 电子科技大学 | A kind of temperature sensor circuit of embedded clock |
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