CN201878066U - In-series voltage-adjusting circuit of thyristor - Google Patents
In-series voltage-adjusting circuit of thyristor Download PDFInfo
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- CN201878066U CN201878066U CN201020299872XU CN201020299872U CN201878066U CN 201878066 U CN201878066 U CN 201878066U CN 201020299872X U CN201020299872X U CN 201020299872XU CN 201020299872 U CN201020299872 U CN 201020299872U CN 201878066 U CN201878066 U CN 201878066U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model provides an in-series voltage-adjusting circuit of a thyristor, which is connected with an alternating current circuit. The in-series voltage-adjusting circuit comprises at least two pairs of inverse-parallel thyristors, a plurality of voltage-equalizing circuits which are cooperatively connected with the inverse-parallel thyristors, and a plurality of overvoltage protection circuits which are cooperatively connected with the inverse-parallel thyristors, wherein the in-series voltage-adjusting circuit has the following differences: two ends of each pair of inverse-parallel thyristors in a thyristor voltage-adjusting circuit are further connected with a harmonic suppression circuit in parallel. The in-series voltage-adjusting circuit has the beneficial effects that firstly, the possibility of the resonance of a plurality of in-series branches of the thyristor is completely avoided, and the thyristor and the relevant devices are greatly protected; and secondly, the harmonic suppression circuit has a function of dynamic voltage equalization, so that the voltage-equalizing performance of the in-series circuit of the thyristor is improved.
Description
Technical field
The utility model relates to electric and electronic technical field, especially a kind of series voltage-regulating circuit of thyristor.
Background technology
Figure 1 shows that three groups of thyristor series circuits of three-phase, also can be many group thyristor series circuits or single phase circuit.Thyristor Q11, Q12, Q13, Q14, Q15, Q16 constitute A phase regulating circuit, and thyristor Q21, Q22, Q23, Q24, Q25, Q26 constitute B phase regulating circuit, and thyristor Q31, Q32, Q33, Q34, Q35, Q36 constitute C phase regulating circuit.Resistance R 11, R12, R13 and capacitor C 11, C12, C13, formation A be equalizer circuit mutually, and resistance R 21, R22, R23 and capacitor C 21, C22, C23 constitute B equalizer circuit mutually, and resistance R 31, R32, R23 and capacitor C 31, C32, C33 constitute C equalizer circuit mutually.Piezo-resistance D11 is used to protect thyristor Q11, Q12 for being connected in parallel on thyristor Q11, the Q12, and also available Overvoltage Protection Board replaces piezo-resistance.In like manner D12, D13, D21, D22, D23, D31, D32, D33 are used to protect thyristor, regulate output voltage by regulating the silicon controlled phase shifting angle.Output connecting resistance load, and the controllable silicon conducting simultaneously of hypothesis series connection turn-offs simultaneously, and its output voltage, current waveform are as shown in Figure 2.All there are a large amount of harmonic components in the output voltage of thyristor phase-shift circuit, output current as can be seen from Figure 2; Fig. 3 is the first-harmonic and the harmonic component of the different angles of flow when connecting ohmic load, as shown in Figure 3, when the thyristor phase-shift circuit connects ohmic load or inductive load, the first-harmonic and the harmonic component of thyristor phase-shift circuit exist in a large number, illustrate that the first-harmonic of thyristor phase-shift circuit is also relevant with loadtype with harmonic component.
Table 1 is typical thyristor characteristics parameter, as can be seen from the table gate trigger current be from 40mA to 300mA between, gate trigger voltage is that 0.8V is between the 3.0V, even select the thyristor of same model for use, its trigger condition can not guarantee in full accord, so serial connection controllable silicon conducting fully simultaneously is that f can not realize.From table, it can also be seen that keeping electric current is that 20mA is to the 300mA, as seen its to turn-off fully simultaneously also be what impossible to realize, because the difference on the serial connection controllable silicon parameter, the inconsistent meeting of serial connection controllable silicon switch further increases harmonic voltage and the harmonic current on the series arm.
In a single day a large amount of harmonic componentss that the thyristor phase-shift voltage regulating produces produce resonance, will cause the thyristor local excess pressure, gently then cause controllable silicon to damage, heavy then influence the safety of electrical network and system.Phenomena of the failure such as thyristor over-voltage breakdown, piezo-resistance puncture also often take place in the engineering practical application.Also be because system resonance causes thyristor series loop overvoltage mostly.
As can be known because thyristor series connection phase shift must produce the specific harmonic component of a part, the existence of this harmonic component has had a strong impact on the reliability of series voltage-regulating circuit of thyristor from above-mentioned analysis.It below is table 1: typical thyristor parameter list.
According to the analysis of front as can be seen, existing many group series voltage-regulating circuit of thyristor have following deficiency:
1, because the inherent characteristic of thyristor phase-shift voltage regulating circuit certainly leads to a large amount of harmonic waves, the safe operation that device and ancillary equipment in too much harmonic voltage or harmonic current serious threat.
2, organize series voltage-regulating circuit of thyristor more in a single day resonance take place, will directly cause the series arm local excess pressure, and conventional over-voltage protector is subjected to the restriction of capacity, can not absorb or suppress the huge energy that resonance causes.
Summary of the invention
Technical problem to be solved in the utility model is: a kind of reliable series voltage-regulating circuit of thyristor is provided, can prevents from the thyristor series loop resonance to take place, the safety of protection thyristor and peripheral circuit thereof.
For solving above technical problem; the technical solution of the utility model is: series voltage-regulating circuit of thyristor; be used to be serially connected between AC power and the load; it comprise at least 2 pairs of anti-parallel thyristors that are cascaded, with anti-parallel thyristor be complementary the equalizer circuit that connects, with the overvoltage crowbar that anti-parallel thyristor is complementary and connects, its difference is: every pair of anti-parallel thyristor two ends also are parallel with harmonic wave and suppress circuit in the described thyristor voltage regulation circuit.
By above scheme, described harmonic wave suppresses circuit and is made of one or more common modes or differential mode reactor, and common mode or differential mode reactor are connected in each between the anti-parallel thyristor.
By above scheme, described harmonic wave suppress circuit comprise one or more common modes or differential mode reactor, with the absorption electric capacity of common mode or differential mode reactor respective amount, be connected across each between the anti-parallel thyristor after common mode or differential mode reactor and the absorption capacitances in series.
By above scheme; described harmonic wave suppress circuit comprise one or more common modes or differential mode reactor, with the absorption electric capacity and the absorption resistance of common mode or differential mode reactor respective amount; constitute lc circuit after absorbing electric capacity and absorption resistance serial or parallel connection, lc circuit is connected across each again with after common mode or differential mode reactor are connected between the anti-parallel thyristor.
1), adopt two groups and two groups of above thyristor tandem workings the thyristor voltage regulation circuit is used to have the application scenario of following characteristic:; 2), adopt thyristor phase shift conducting technology, regulate the thyristor angle of flow, regulate output voltage.
On the basis of above-mentioned feature circuit, the utility model thyristor voltage regulation circuit has following obvious characteristic:
1), on each antiparallel thyristor, the harmonic wave that LCR in parallel constitutes suppresses circuit.LCR has multiple circuit structure and can be zero.
2), L adopts polyphase coupling system usually
Be compared with the prior art, the beneficial effects of the utility model are:
1) avoids the possibility of thyristor series arm generation resonance, fully, protected thyristor and related device thereof greatly.
2), harmonic wave suppresses circuit and has the dynamic voltage balancing function, improved all pressures performance of thyristor series circuit.
Description of drawings
Fig. 1 is three groups of thyristor series circuits of three-phase in the prior art;
Fig. 2 is output voltage, the current waveform of circuit shown in Figure 1, and the conducting simultaneously of the controllable silicon of its series connection is turn-offed simultaneously;
Fig. 3 is the first-harmonic and the harmonic component of the different angles of flow when connecting ohmic load;
The thyristor series circuit that Fig. 4 adopts the LC harmonic wave to suppress for the utility model;
Fig. 5 is a kind of novel thyristor series circuit that the employing LRC harmonic wave that the utility model proposes suppresses;
Fig. 6 is a kind of novel thyristor series circuit that the employing L harmonic wave that the utility model proposes suppresses;
Fig. 7 is a kind of novel thyristor series circuit that the employing LR//C harmonic wave that the utility model proposes suppresses.
Embodiment
The general thought of the utility model execution mode is: series voltage-regulating circuit of thyristor; be used to be serially connected between AC power and the load; it comprise at least 2 pairs of anti-parallel thyristors that are cascaded, with anti-parallel thyristor be complementary the equalizer circuit that connects, with the overvoltage crowbar that anti-parallel thyristor is complementary and connects, every pair of anti-parallel thyristor two ends also are parallel with harmonic wave and suppress circuit in the described thyristor voltage regulation circuit.
Concrete, above-mentioned harmonic wave suppresses circuit and can be made of one or more common modes or differential mode reactor, and common mode or differential mode reactor are connected in each between the anti-parallel thyristor.
Concrete; above-mentioned harmonic wave suppresses circuit and can also constitute in the following ways: it comprise one or more common modes or differential mode reactor, with the absorption electric capacity of common mode or differential mode reactor respective amount, be connected across each between the anti-parallel thyristor after common mode or differential mode reactor and the absorption capacitances in series.
Concrete; above-mentioned harmonic wave suppresses circuit and can also constitute in the following ways: it comprise one or more common modes or differential mode reactor, with the absorption electric capacity and the absorption resistance of common mode or differential mode reactor respective amount; constitute lc circuit after absorbing electric capacity and absorption resistance serial or parallel connection, lc circuit is connected across each again with after common mode or differential mode reactor are connected between the anti-parallel thyristor.
Below in conjunction with accompanying drawing the utility model embodiment is further described.
The thyristor series circuit that Fig. 4 adopts the LC harmonic wave to suppress for the utility model; As shown in Figure 4, series connection common mode or differential mode reactor and absorption electric capacity between series thyristor.Can eliminate the harmonic component of particular range targetedly according to the characteristic of side circuit, prevent circuit resonance.Harmonic wave suppresses circuit and is made of capacitor C g11, reactor Lg11, capacitor C g11 wherein, constitute the resonant circuit of specific nth harmonic with inductance L g11, be equivalent to short circuit for the nth harmonic component, owing to Lg11, Lg12, Lg13 are three-phase common mode reactor, has the dynamic voltage balancing effect simultaneously for the thyristor series circuit.The equivalent inductance that is connected in parallel on the reactor Lg11 on Q11 and the Q12 is L, and the electric capacity of capacitor C g11 is C, and then the resonance frequency of this circuit is
For frequency is the component of f, is short-circuit condition, therefore can not produce resonance on series thyristor.
Thyristor series circuit as shown in Figure 4 can be used for high-voltage motor phase-shift voltage regulating soft start.When being used for 10000V high-voltage motor soft start, one adopts 5 groups of antiparallel high-pressure thyristor series operations of 6000V.As shown in Figure 8, adopted the LC harmonic wave to suppress circuit, getting C is 2.5 μ F, and the equivalent electric sensibility reciprocal of the every phase of five phase common mode reactors is 4.8mH.Resonance frequency is
Be about 29 times of first-harmonic 50HZ, that is to say 29 subharmonic are short-circuit condition.The effect that absorbs and suppress is best.
Facts have proved the thyristor series circuit reliability height that adopts the LC harmonic wave to suppress.
The utility model also has Fig. 5 to 3 kinds of basic circuit topologys shown in Figure 7 except that Fig. 4.Fig. 5 is a kind of novel thyristor series circuit that the employing LRC harmonic wave that the utility model proposes suppresses; Fig. 6 is a kind of novel thyristor series circuit that the employing L harmonic wave that the utility model proposes suppresses; Fig. 7 is a kind of novel thyristor series circuit that the employing LR//C harmonic wave that the utility model proposes suppresses.
The above, it only is preferred embodiment of the present utility model, be not that utility model is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of the present utility model any simple modification, equivalent variations and modification that above embodiment did.
Claims (4)
1. series voltage-regulating circuit of thyristor; be used to be serially connected between AC power and the load; it comprise at least 2 pairs of anti-parallel thyristors that are cascaded, with anti-parallel thyristor be complementary the equalizer circuit that connects, with the overvoltage crowbar that anti-parallel thyristor is complementary and connects, it is characterized in that: every pair of anti-parallel thyristor two ends also are parallel with harmonic wave and suppress circuit in the described thyristor voltage regulation circuit.
2. series voltage-regulating circuit of thyristor as claimed in claim 1 is characterized in that: described harmonic wave suppresses circuit and is made of one or more common modes or differential mode reactor, and common mode or differential mode reactor are connected in each between the anti-parallel thyristor.
3. series voltage-regulating circuit of thyristor as claimed in claim 1; it is characterized in that: described harmonic wave suppress circuit comprise one or more common modes or differential mode reactor, with the absorption electric capacity of common mode or differential mode reactor respective amount, be connected across each between the anti-parallel thyristor after common mode or differential mode reactor and the absorption capacitances in series.
4. series voltage-regulating circuit of thyristor as claimed in claim 1; it is characterized in that: described harmonic wave suppress circuit comprise one or more common modes or differential mode reactor, with the absorption electric capacity and the absorption resistance of common mode or differential mode reactor respective amount; constitute lc circuit after absorbing electric capacity and absorption resistance serial or parallel connection, lc circuit is connected across each again with after common mode or differential mode reactor are connected between the anti-parallel thyristor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020299872XU CN201878066U (en) | 2010-08-20 | 2010-08-20 | In-series voltage-adjusting circuit of thyristor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020299872XU CN201878066U (en) | 2010-08-20 | 2010-08-20 | In-series voltage-adjusting circuit of thyristor |
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| CN201878066U true CN201878066U (en) | 2011-06-22 |
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| CN201020299872XU Expired - Fee Related CN201878066U (en) | 2010-08-20 | 2010-08-20 | In-series voltage-adjusting circuit of thyristor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101902120A (en) * | 2010-08-20 | 2010-12-01 | 大禹电气科技股份有限公司 | Series voltage-regulating circuit of thyristor |
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- 2010-08-20 CN CN201020299872XU patent/CN201878066U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101902120A (en) * | 2010-08-20 | 2010-12-01 | 大禹电气科技股份有限公司 | Series voltage-regulating circuit of thyristor |
| CN101902120B (en) * | 2010-08-20 | 2016-04-13 | 大禹电气科技股份有限公司 | Series voltage-regulating circuit of thyristor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20170820 |