CN102035188B - Novel thyristor overvoltage protection method - Google Patents
Novel thyristor overvoltage protection method Download PDFInfo
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Abstract
The invention provides a novel thyristor overvoltage protection method, which comprises the steps of: measuring the voltage of the thyristor by a thyristor triggering and monitoring unit by utilizing a voltage divider, and immediately triggering the thyristor when the voltage of the thyristor reaches a protection level. A direct current voltage-sharing resistor of the thyristor is skillfully used as a high-voltage arm of the voltage divider, and a low-voltage arm is arranged on the thyristor triggering and monitoring unit. The thyristor overvoltage protection level can be adjusted in real time as required. The method overcomes all the defects of the method in which a BOD (Break Over Diode) device is used for overvoltage protection.
Description
Technical field
The invention belongs to electron electric power field and direct current transportation field, relate to a kind of thyristor overvoltage protection method method.
Background technology
Traditional thyristor overvoltage protection method is for reaching default level of protection when thyristor voltage, and protection immediately triggers thyristor, and level of protection is default fixed value.But in the common series operation of high-power field thyristor; the parallel connection of thyristor two ends damping resistance, damping capacitor and direct current grading resistor; the triggered as normal of thyristor and overvoltage protection adopt thyristor to trigger with monitoring means and realize; once the triggered as normal loop of thyristor is damaged; when equipment continues operation; the thyristor of series connection with it can triggered as normal conducting; and the impaired thyristor in triggered as normal loop can only lean on overvoltage protection to trigger; in order to improve the availability of equipment, allow this operating mode long-time running.Damping resistance, damping capacitor and direct current grading resistor at this operating mode thyristor bear very high voltage and current intensity, and its dv/dt, di/dt are very large, easily cause the damage of damping resistance, damping capacitor and direct current grading resistor.According to this operating mode, determine the rated voltage of damping resistance, damping capacitor and direct current grading resistor, its rated voltage is higher simultaneously; The rated power of determining damping resistance, direct current grading resistor according to this operating mode, its rated power is larger.
Traditional thyristor overvoltage protection implementation method adopts BOD device to realize, when thyristor voltage reaches after BOD device electric breakdown strength, and the breakdown conducting of BOD device, On current injects gate circuit transistor gate makes its triggering and conducting, has realized thyristor overvoltage protection.BOD device and current-limiting resistance are arranged on thyristor and trigger and monitoring means, there are four kinds of shortcomings in the thyristor overvoltage protection that this mode realizes, shortcoming one: the high voltage induction thyristor of thyristor anode triggers and monitoring means, make the volume of circuit board very large, be unfavorable for device miniaturization and densification; During shortcoming two: BOD protection action, the high voltage that BOD loop is instantaneous and large electric current (pulse current) trigger with monitoring means logical circuit and have larger electromagnetic interference thyristor, have reduced thyristor and have triggered and monitoring means anti-electromagnetic interference capability; Shortcoming three: BOD device is more expensive, has increased equipment manufacturing cost; Shortcoming four: overvoltage protection level is non-adjustable, level of protection is the puncture voltage of BOD device.
Chinese patent application 200920083881.2 discloses a kind of high-power thyristor protection device; it comprises thyristor (KP1); circuits for triggering (2); after thyristor described in it (KP1), lightning arrester (MYN1), commutation absorption plant (RC) parallel connection, connect with fuse (RD), then be connected with working power (AX).It has overcome in existing electrical network does not carry out the effectively problem of protection to high-power thyristor.Overvoltage, overcurrent and superheating phenomenon that the utility model adopts five kinds of safeguard measures to occur in running thyristor are all fully effectively protected.
Chinese patent application 200610064922.4 discloses a kind of breakdown diode and has triggered thyristor-type overvoltage protection; thyristor and annex thereof by one or more series connection form; between thyristor valve gate pole and anode, meet BOD; when the forward voltage at thyristor two ends surpasses a certain particular value, BOD is transformed into on-state, by a kind of short circuit effect sharply, triggers thyristor.The thyristor two ends damping absorption circuit that also parallel resistance and electric capacity form, BOD triggers series thyristor unit by protection damping resistance ground connection.The operation voltage of BOD can determine superpotential level of protection, and damping absorption circuit absorbs the shutoff overshoot of thyristor valve, also plays the effect that slows down overvoltage wave head.Protection damping resistance plays electric current, the catabiotic effect of suppressing, and the selection of its resistance value has also determined the size of protection action residual voltage simultaneously.Most of energy of overvoltage shock wave all consumes on protection damping resistance, and thyristor is the conduction loss of self.
Above two kinds of patent applications adopt BOD protection, BOD device and current-limiting resistance are arranged on thyristor and trigger and monitoring means, there are four kinds of shortcomings in the thyristor overvoltage protection that this mode realizes, shortcoming one: the high voltage induction thyristor of thyristor anode triggers and monitoring means, make the volume of circuit board very large, be unfavorable for device miniaturization and densification; During shortcoming two: BOD protection action, the high voltage that BOD loop is instantaneous and large electric current (pulse current) trigger with monitoring means logical circuit and have larger electromagnetic interference thyristor, have reduced thyristor and have triggered and monitoring means anti-electromagnetic interference capability; Shortcoming three: BOD device is more expensive, has increased equipment manufacturing cost; Shortcoming four: overvoltage protection level is non-adjustable, level of protection is the puncture voltage of BOD device.
Summary of the invention
Thyristor overvoltage protection method is for working as the continuous action of thyristor overvoltage protection to a stipulated number, and the time interval of each action is less than or equal to the time interval of triggered as normal, automatically turns down level of protection; When the time that overvoltage protection disappears, be greater than time interval of triggered as normal, level of protection returns to initial value automatically.Automatically the level of protection establishing method after turning down: make it that misoperation not occur in normal operation.
Adopt after the thyristor overvoltage protection method of the present invention's introduction, according to overvoltage protection, the rated voltage of damping resistance, damping capacitor and direct current grading resistor is determined in continuous action, and its rated voltage reduces to some extent; According to overvoltage protection, the rated power of damping resistance, direct current grading resistor is determined in continuous action, and its rated power reduces to some extent.While there is the continuous action of thyristor overvoltage protection; voltage, electric current and dv/dt, the di/dt of damping resistance, damping capacitor and direct current grading resistor are less; be not easy to damage damping resistance, damping capacitor and direct current grading resistor, greatly improved the reliability of equipment.
A kind of thyristor overvoltage protection method of the present invention, in comprising the following steps:
(1) thyristor triggers with monitoring means and utilizes the high-voltage arm of voltage divider and low-voltage arm to measure thyristor voltage, and when thyristor voltage reaches level of protection, thyristor triggers with monitoring means and produces trigger impulse, triggers immediately thyristor;
(2) when the time that thyristor overvoltage protection disappears, be greater than the time interval of triggered as normal, level of protection returns to initial value automatically;
(3), when the continuous action of thyristor overvoltage protection is to stipulated number, the time interval of each action is less than or equal to the time interval of triggered as normal, automatically turns down level of protection;
Wherein, as thyristor, trigger the high-voltage arm with monitoring means voltage acquisition voltage divider with two direct current grading resistors of Thyristors in series, without being equipped with independent voltage divider.
Wherein, low-voltage arm is arranged on thyristor triggering and monitoring means.
Wherein, thyristor overvoltage protection level can regulate as required in real time.
Wherein, by thyristor, trigger with monitoring means and realize, resistance R j1, Rj2 is the direct current grading resistor of series connection, double as the high-voltage arm of voltage divider, the low-voltage arm of voltage divider is by resistance R 1, R2, R3, capacitor C 1 and diode D1 form, voltage ratio is by resistance R j1, Rj2, R1, R2, the resistance value of R3 is determined jointly, resistance R j1 wherein, Rj2 resistance value is selected by Thyristors in series operation characteristic, according to resistance R j1, Rj2 resistance value and voltage ratio require to determine resistance R 1, R2, R3 resistance value, capacitor C 1 is for filtering and anti-interference, diode D1 is by the reverse voltage clamper of voltage divider low-voltage arm, prevent that the too high damage thyristor of reverse voltage from triggering and monitoring means,
Wherein, by the thyristor voltage collecting, be also resistance R 3 and R2 tie point voltage, with the level of protection comparison of setting, judge whether overvoltage of thyristor, if there is overvoltage, produce trigger impulse, triggering thyristor; Judge whether continuous action reaches stipulated number to thyristor overvoltage protection, the time interval of each action is less than or equal to the time interval of triggered as normal, automatically turns down level of protection simultaneously; When the time that overvoltage protection disappears, be greater than time interval of triggered as normal, level of protection returns to initial value automatically, and the level of protection after automatically turning down is set, and makes it that misoperation not occur in normal operation.
The advantage of technical solution of the present invention is:
1) introducing thyristor triggering is the voltage of voltage divider low-voltage arm with the voltage of monitoring means, has greatly reduced the volume of circuit board, has realized miniaturization and the densification of thyristor triggering with monitoring means;
2) when overvoltage protection is moved, there is no high pressure, large electric current (pulse current), improved thyristor and triggered and monitoring means anti-electromagnetic interference capability;
3) adopt voltage measurement mode, utilize original direct current grading resistor as the high-voltage arm of voltage divider, the electronic circuit price of low-voltage arm is low more than BOD, has greatly saved equipment cost;
4) overvoltage protection level can regulate as required in real time, realizes the over-voltage protection method of any mode;
5) adopt after new thyristor overvoltage protection method, the rated voltage of damping resistance, damping capacitor and direct current grading resistor decreases; The rated power of damping resistance, direct current grading resistor decreases.While there is the continuous action of thyristor overvoltage protection; voltage, electric current and dv/dt, the di/dt of damping resistance, damping capacitor and direct current grading resistor are less; be not easy to damage damping resistance, damping capacitor and direct current grading resistor, greatly improved the reliability of equipment.
Accompanying drawing explanation
In order to make content of the present invention by clearer understanding, and be convenient to the description of embodiment, provide accompanying drawing related to the present invention below and be described as follows:
Fig. 1 shows the logical circuit of thyristor triggering of the present invention and monitoring means overvoltage protection.
Embodiment
A kind of thyristor overvoltage protection method of the present invention is triggered with monitoring means and is realized by thyristor, and principle is as technology accompanying drawing 2.Rj1, Rj2 are the direct current grading resistor of series connection, double as the high-voltage arm of voltage divider.The low-voltage arm of voltage divider is comprised of resistance R 1, R2, R3, capacitor C 1 and diode D1.Voltage ratio is jointly definite by Rj1, Rj2, R1, R2, R3 resistance value, and wherein Rj1, Rj2 resistance value are selected by Thyristors in series operation characteristic, according to Rj1, Rj2 resistance value and voltage ratio, requires to determine R1, R2, R3 resistance value.Capacitor C 1 filtering and anti-interference, diode D1, by the reverse voltage clamper of voltage divider low-voltage arm, prevents that the too high damage thyristor of reverse voltage from triggering and monitoring means.
Thyristor triggers with the logical circuit of monitoring means overvoltage protection sees technology accompanying drawing 2, by the thyristor voltage collecting (R3 and R2 tie point voltage) and the level of protection comparison of setting, judge whether overvoltage of thyristor, if there is overvoltage, produce trigger impulse, trigger thyristor; Judge whether continuous action reaches stipulated number to thyristor overvoltage protection, the time interval of each action is less than or equal to the time interval of triggered as normal, automatically turns down level of protection simultaneously; When the time that overvoltage protection disappears, be greater than time interval of triggered as normal, level of protection returns to initial value automatically.Automatically the level of protection establishing method after turning down: make it that misoperation not occur in normal operation.
Above by special embodiment content description the present invention, but those skilled in the art also can recognize the multiple possibility of modification and optional embodiment, for example, by combining and/or change the feature of single embodiment.Therefore, be understandable that these modification and optional embodiment will be considered as included in the present invention, scope of the present invention is enclosed patent claims and coordinate restriction thereof only.
Claims (6)
1. a thyristor overvoltage protection method, is characterized in that comprising the following steps:
(1) thyristor triggers with monitoring means and utilizes the high-voltage arm of voltage divider and low-voltage arm to measure thyristor voltage, and when thyristor voltage reaches level of protection, thyristor triggers with monitoring means and produces trigger impulse, triggers immediately thyristor;
(2) when the time that thyristor overvoltage protection disappears, be greater than the time interval of triggered as normal, level of protection returns to initial value automatically;
(3), when the continuous action of thyristor overvoltage protection is to stipulated number, the time interval of each action is less than or equal to the time interval of triggered as normal, automatically turns down level of protection.
2. the method for claim 1, is characterized in that: as thyristor, trigger the high-voltage arm with monitoring means voltage acquisition voltage divider with two direct current grading resistors of Thyristors in series, without being equipped with independent voltage divider.
3. the method for claim 1, is characterized in that: low-voltage arm is arranged on thyristor and triggers and monitoring means.
4. the method for claim 1, is characterized in that: thyristor overvoltage protection level regulates as required in real time.
5. the method as described in as arbitrary in claim 1-4, it is characterized in that triggering with monitoring means and realizing by thyristor, resistance R j1, Rj2 is the direct current grading resistor of series connection, double as the high-voltage arm of voltage divider, the low-voltage arm of voltage divider is by resistance R 1, R2, R3, capacitor C 1 and diode D1 form, voltage ratio is by resistance R j1, Rj2, R1, R2, the resistance value of R3 is determined jointly, resistance R j1 wherein, Rj2 resistance value is selected by Thyristors in series operation characteristic, according to resistance R j1, Rj2 resistance value and voltage ratio require to determine resistance R 1, R2, R3 resistance value, capacitor C 1 is for filtering and anti-interference, diode D1 is by the reverse voltage clamper of voltage divider low-voltage arm, prevent that the too high damage thyristor of reverse voltage from triggering and monitoring means.
6. method as claimed in claim 5, is characterized in that the thyristor voltage collecting, and is also resistance R 3 and R2 tie point voltage, with the level of protection comparison of setting, judge whether overvoltage of thyristor, if there is overvoltage, produce trigger impulse, trigger thyristor; Judge whether continuous action reaches stipulated number to thyristor overvoltage protection, the time interval of each action is less than or equal to the time interval of triggered as normal, automatically turns down level of protection simultaneously; When the time that overvoltage protection disappears, be greater than time interval of triggered as normal, level of protection returns to initial value automatically, and the level of protection after automatically turning down is set, and makes it that misoperation not occur in normal operation.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102435814A (en) * | 2011-09-30 | 2012-05-02 | 中国电力科学研究院 | Device for measuring arc voltage of direct current circuit breaker |
| CN102709886B (en) * | 2012-06-08 | 2014-08-06 | 湖北三环发展股份有限公司 | Status monitoring and overvoltage protection system of high-voltage TCR (Thyristor Controlled Reactor) thyristor valve gate set |
| CN103048594B (en) * | 2012-12-13 | 2016-03-02 | 国网智能电网研究院 | A kind of thyristor triggers lightning arrester connected in parallel test method and device non-periodic |
| CN103048595B (en) * | 2012-12-13 | 2016-01-20 | 国网智能电网研究院 | A kind of thyristor opens stress test method and device |
| CN105116314B (en) * | 2015-06-30 | 2018-06-26 | 中国西电电气股份有限公司 | A kind of thyristor protection detection trigger method |
| CN105158669B (en) * | 2015-08-28 | 2017-12-22 | 中冶南方工程技术有限公司 | A kind of IGCT over-voltage detection circuit for TCR type high pressure SVC devices |
| CN106899283B (en) * | 2017-02-22 | 2019-12-06 | 南京南瑞继保电气有限公司 | Protective trigger circuit based on discrete components |
| CN108011357B (en) * | 2017-12-26 | 2019-04-05 | 保定尤耐特电力科技有限公司 | A kind of thyristor groups string protective device and method |
| CN109459633B (en) * | 2018-10-31 | 2021-08-20 | 全球能源互联网研究院有限公司 | Method, device and system for diagnosing fault of thyristor-level circuit of direct-current transmission converter valve |
| CN110808606B (en) * | 2019-12-09 | 2023-10-20 | 南方电网科学研究院有限责任公司 | Overvoltage protection circuit for power module of flexible direct current transmission and converter valve |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1835321A (en) * | 2006-03-17 | 2006-09-20 | 中国电力科学研究院 | Breakdown diode triggering thyristor valve over-voltage protector |
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| JPH077925A (en) * | 1993-06-15 | 1995-01-10 | Toshiba Corp | Protective device of thyristor bulb |
| JP4467316B2 (en) * | 2004-01-21 | 2010-05-26 | 東芝三菱電機産業システム株式会社 | Series circuit of thyristor with overvoltage protection function |
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| CN1835321A (en) * | 2006-03-17 | 2006-09-20 | 中国电力科学研究院 | Breakdown diode triggering thyristor valve over-voltage protector |
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| JP特开2005-210791A 2005.08.04 |
| JP特开平7-7925A 1995.01.10 |
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