CN202503300U - Tsc switching control device - Google Patents
Tsc switching control device Download PDFInfo
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- CN202503300U CN202503300U CN2012201809823U CN201220180982U CN202503300U CN 202503300 U CN202503300 U CN 202503300U CN 2012201809823 U CN2012201809823 U CN 2012201809823U CN 201220180982 U CN201220180982 U CN 201220180982U CN 202503300 U CN202503300 U CN 202503300U
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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]
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Abstract
The utility model discloses a TSC (Thyristor Switched Capacitor) switching control device. The TSC switching control device comprises a thyristor Q1, a thyristor Q2, a compensation capacitor C1, a thyristor driving unit, an alternative current zero-crossing moment detection unit, an alternative current signal peak moment diction unit and a main control unit. The thyristor Q1 and the thyristor Q2 are connected in parallel and are arranged in inverse directions. The positive electrode of the thyristor Q1 is connected with an alternative current input port 1, and the negative electrode of the thyristor Q1 is connected with an alternative current input port 2. The main control unit is used for receiving an alternative current zero-crossing moment signal and an alternative current peak moment, and generating a control signal and transmitting the control signal to the thyristor driving unit, and the thyristor drives the conduction of the thyristor Q1 and the thyristor Q2. The TSC switching control device has advantages of small impulse current on the compensation capacitor, long service life, low cost etc.
Description
Technical field
The utility model relates to a kind of TSC switching control device.
Background technology
Present TSC (Thyristor switched capacitor; The thyristor series capacitor device) type reactive power compensator switching device commonly used; The employing thyristor exchanges the voltage zero-cross Switching Strategy mostly; Promptly alternating voltage zero-crossing makes the thyristor conducting constantly at the thyristor two ends, thereby makes the reactive power compensation electric capacity of reactive power compensator be connected to the electrical network two ends, realizes the reactive power compensation to electrical network.In practical application, the weak point of this TSC switching device is following: when 1) voltage zero-cross drops into, have 2-3 times of oscillating current in the circuit; Can influence the life-span of electric capacity for a long time; Reason is that zero cross detection circuit generally can't detect absolute zero crossing, generally is conducting less than some small voltage values near no-voltage the time, needs the regular hour and thyristor is logical; When voltage change ratio is the fastest just near the voltage over zero; Like this actual conducting of circuit the time, there is bigger voltage difference at the thyristor two ends, and the actual measurement proof can 2-3 times of shock oscillation electric current of generation.2) when bigger harmonic wave is arranged in the electrical network, getting the wrong sow by the ear of thyristor voltage zero crossing is poor, causes bigger shoving, and probably is several times even tens times of electric capacity rated current when serious, has a strong impact on the electric capacity life-span.
To this situation, produced TSC switching device again based on electrical network crest voltage Switching Strategy, this TSC switching device adopts rectifying tube of a thyristor inverse parallel.When TSC does not send the switching order, not conducting of thyristor, rectifying tube is conducting always, and capacitor is charged at the state of line voltage peak value always.In the time of the needs switching, the peak detection circuit of TSC switching device detects voltage peak constantly, drives the thyristor conducting.Because this moment, line voltage was in peak value, electric capacity also is recharged at peak value, simultaneously because near the voltage change ratio of voltage peak is little; In the thyristor conducting moment, the actual electrical pressure reduction on the thyristor is very little, in the time of the thyristor conducting; In the switching branch road, basic dead-beat electric current.The TSC switching device shortcoming of this peak value Switching Strategy is that when equipment powered on for the first time, rectifying tube is conducting immediately at random; The building-out capacitor two ends have very big voltage difference, can produce very big impulse current, have a strong impact on the electric capacity life-span; When therefore powering on for the first time, need special circuit to realize switching capacitance is shifted to an earlier date precharge, because precharging circuit impacts for avoiding; The general employing is connected in series the high-power resistance current limliting, so cost is high, and the switching device powers on and can not work immediately.
The utility model content
The utility model is the weak point that exists in the above-mentioned prior art for avoiding; A kind of TSC switching control device is provided, when solving the switching of simple voltage zero-cross switching device big, the simple voltage peak switching of impulse current for the first time switching impact big or need special pre-charge circuit, cost high, power on and problem such as can not use immediately.
The utility model adopts following technical scheme for the technical solution problem.
TSC switching control device, its design feature are to comprise thyristor Q1, thyristor Q2, building-out capacitor C1, thyristor driver unit, alternating current zero crossing detecting unit, AC signal peak value moment detecting unit and main control unit constantly;
Said thyristor Q1 is in parallel with thyristor Q2 and is connected and thyristor Q1 and thyristor Q2 reverse setting (said thyristor Q1 and thyristor Q2 reverse parallel connection) each other, and the anode of said thyristor Q1 is connected with ac input end mouth 1; The negative electrode of thyristor Q1 is connected with ac input end mouth 2; The end of said building-out capacitor C1 is connected with the negative electrode of said thyristor Q1, and the other end of said building-out capacitor C1 is connected with ac input end mouth 2;
Said thyristor driver unit is connected with the gate pole of said thyristor Q1 and the gate pole of thyristor Q2;
Said alternating current zero crossing is detecting unit constantly, is used for the AC signal at thyristor two ends is carried out zero passage detection;
Said AC signal peak value is detecting unit constantly, is used for isolation, amplification, LPF to AC signal, obtains ac small signal and sends into main control unit calculatings of sampling, and obtains the AC signal peak value moment;
Said main control unit; Be used to receive the alternating current zero crossing moment signal of alternating current zero crossing moment detecting unit acquisition, the peak values of ac moment signal of reception AC signal peak value moment detection; Produce control signal and control signal is sent to the thyristor driver unit, by the conducting of said thyristor Q1 of thyristor driver unit drives and thyristor Q2.
The design feature of the TSC switching control device of the utility model also is:
Said main control unit is a single-chip microcomputer.
Said alternating current zero crossing detecting unit constantly adopts optocoupler.
Compared with present technology, the utility model beneficial effect is embodied in:
The TSC switching control device of the utility model; During device power; Adopt current over-zero constantly, drop into a brake tube, to external building-out capacitor charging; The suffered impulse current of the external building-out capacitor of this mode is more than under thyristor and the diode inverse parallel situation, and the impulse current of conducting is little at random immediately for the diode that powers on constantly.Because the zero passage detection unit is small electric electronic circuit (because the zero passage detection unit is conventional small-signal electronic circuit); Its cost is also more than under thyristor and the diode inverse parallel situation; Power on and adopt high-power resistance to realize that the scheme cost of preliminary filling is low constantly; Simultaneously building-out capacitor is charged less than a cycle 20ms, pre-charging time is also much smaller than adopting high-power resistance to realize the scheme of preliminary filling.
The utility model adopts alternating voltage peak constantly for the switching of building-out capacitor; The conducting thyristor is realized; Because alternating voltage rate of change this moment is little more than the scheme of operating passing zero, therefore have under the situation of intrinsic error in actual electronic circuits, the voltage difference on the building-out capacitor switching branch road is also little a lot of than the latter; Impulse current on the external compensation electric capacity is also little a lot, and prolong equipment life greatly.
The TSC switching control device of the utility model has, long service life little to the impulse current on the building-out capacitor, low cost and other advantages.
Description of drawings
Fig. 1 is the circuit structure diagram of the TSC switching control device of the utility model.
Below pass through embodiment, and combine accompanying drawing that the utility model is described further.
Embodiment
Referring to Fig. 1, TSC switching control device is characterized in that, comprises thyristor Q1, thyristor Q2, building-out capacitor C1, thyristor driver unit, alternating current zero crossing detecting unit, AC signal peak value moment detecting unit and main control unit constantly;
Said thyristor Q1 is in parallel with thyristor Q2 and is connected and thyristor Q1 and reverse each other be provided with (said thyristor Q1 and the thyristor Q2 reverse parallel connection) of thyristor Q2, and the anode A of said thyristor Q1 is connected with ac input end mouth 1; The negative electrode of thyristor Q1 is connected with ac input end mouth 2 pin; The end of said building-out capacitor C1 is connected with the negative electrode K of said thyristor Q1, and the other end of said building-out capacitor C1 is connected with ac input end mouth 2; Be that the anode A of thyristor Q1 is connected with the negative electrode K of thyristor Q2 and tie point is D; The negative electrode K of thyristor Q1 is connected with the anode A of thyristor Q2 and tie point is E; D is connected with ac input end mouth 1, and E is connected with ac input end mouth 2 through building-out capacitor C1;
Said thyristor driver unit is connected with the gate pole G of said thyristor Q1 and the gate pole G of thyristor Q2;
Said alternating current zero crossing is detecting unit constantly, is used for the AC signal at thyristor two ends is carried out zero passage detection;
Said AC signal peak value is detecting unit constantly, is used for isolation, amplification, LPF to AC signal, obtains ac small signal and sends into main control unit calculatings of sampling, and obtains the AC signal peak value moment;
Said main control unit; Be used to receive the alternating current zero crossing moment signal of alternating current zero crossing moment detecting unit acquisition, the peak values of ac moment signal of reception AC signal peak value moment detection; Produce control signal and control signal is sent to the thyristor driver unit, by the conducting of said thyristor Q1 of thyristor driver unit drives and thyristor Q2.
Said main control unit is a single-chip microcomputer.Said alternating current zero crossing detecting unit constantly adopts optocoupler.
In the utility model; By the zero passage moment of optical coupling type alternating current zero crossing moment detection AC signal; By the detection AC signal peak value moment in the AC signal peak value moment based on the AC signal sampling; With single-chip microcomputer as master board, and the thyristor through a pair of reverse parallel connection of monolithic processor controlled thyristor driver unit drives.
The zero passage detection of alternating current zero crossing detecting unit completion constantly thyristor two ends AC signal, when equipment powered on for the first time, main control unit drove a thyristor conducting according to this zero cross signal, accomplished the charging to external building-out capacitor.
Peak values of ac constantly detecting unit is accomplished the isolation to AC signal, amplifies, and LPF obtains ac small signal and sends into main control unit calculatings of sampling, and obtains the AC signal peak value moment.
Main control unit is accomplished the alternating current zero crossing reception of signal constantly, and the thyristor driver unit is controlled in peak values of ac detection constantly in view of the above, drives the thyristor conducting.The effect of thyristor driver unit is to drive the thyristor conducting.
The thyristor of two reverse parallel connections, realization power on the time, the conducting constantly of thyristor voltage zero passage; Completion is to the charging of external building-out capacitor; Another is used for conducting in the line voltage peak value, makes building-out capacitor be connected to electrical network, accomplishes the compensation to electric network reactive-load.
The external electrical network AC signal is V1, inputs to the control device of the utility model by ac input end mouth 1 and ac input end mouth 2, with external building-out capacitor series connection, is connected on the input at AC signal V1 after the thyristor Q1, Q2 reverse parallel connection.When main control unit detects equipment and works on power for the first time, receive the alternating current zero crossing zero passage signal constantly of the alternating voltage V2 that sends of detecting unit constantly, when receiving this signal; Control thyristor driver unit drives thyristor Q1 conducting; External building-out capacitor C1 is charged, because the conduction pipe pressure drop of Q1 is very little, when alternating current the time through all crest value; External building-out capacitor is charged to the peak value of alternating voltage in less than the power frequency period 20ms time.
Simultaneously, because the V2 signal is the voltage at thyristor two ends, when the moment of this voltage zero-cross; Make thyristor Q1 conducting, the voltage difference at Q1 two ends is zero, in the time of the actual conducting of thyristor; The voltage difference at capacitive branch two ends is little; Therefore conducting constantly though impulse current arranged, impulse current is little, is much smaller under the situation of impulse current more than the conducting thyristor at random of powering on.
Because generally speaking; Reactive-load compensation equipment all is to be in running status, and in the life cycle of this product, the number of times of device power can be not a lot; Again because the impulse current of alternating voltage zero-crossing conducting constantly; The impulse current of conducting thyristor is much smaller than powering at random, so the impact damage that receives of AC compensation electric capacity is very little, and the life-span prolongs greatly.
Alternating current zero crossing is detection line voltage peak value constantly, obtains grid ac voltage peak value signal constantly, delivers to main control unit.
After the precharge to external building-out capacitor when the equipment completion powers on; TSC switching device is waited for the switching order that reactive power compensator sends; When TSC switching device main control unit detects the switching order, and detect line voltage V3 peak value constantly, control thyristor driver unit drives thyristor Q2 conducting; Make external building-out capacitor be connected to the electrical network two ends, realize the compensation of reactive power.
This moment, external building-out capacitor C1 voltage was charged to line voltage because thyristor Q1 conducting, and dropped into constantly that line voltage is a peak value, dropped into therefore constantly that the voltage at external capacitor C1 two ends is zero basically, had basically no impulse current.
Because industrial alternating voltage waveform is sinusoidal wave, sinusoidal wave peak value voltage change ratio constantly is 0, and near the voltage change ratio it is also very little; Sine voltage zero passage voltage change ratio constantly is infinitely great, and the voltage change ratio of near zero-crossing point is also very big, in fact because the deviation of testing circuit; The factors such as time-delay of thyristor conducting, for operating passing zero and peak value switching, the time point of the complete conducting of thyristor all lags behind to some extent; All poor if having time, consider that peak values of ac moment film rate of change is 0, zero passage voltage change ratio constantly is infinitely great; In the thyristor conducting constantly; The voltage difference at thyristor two ends is much smaller more than alternating voltage zero-crossing conducting constantly during peak value conducting constantly, and therefore the suffered impact of external building-out capacitor is also little a lot, has prolonged the life-span of external building-out capacitor greatly; The thyristor power consumption is also little, and thyristor is not fragile yet.
Claims (3)
1.TSC the switching control device is characterized in that, comprises thyristor Q1, thyristor Q2, building-out capacitor C1, thyristor driver unit, alternating current zero crossing detecting unit, AC signal peak value moment detecting unit and main control unit constantly;
Said thyristor Q1 is in parallel with thyristor Q2 and is connected and thyristor Q1 and the reverse each other setting of thyristor Q2; The anode of said thyristor Q1 is connected with ac input end mouth 1; The negative electrode of thyristor Q1 is connected with ac input end mouth 2; The end of said building-out capacitor C1 is connected with the negative electrode of said thyristor Q1, and the other end of said building-out capacitor C1 is connected with ac input end mouth 2;
Said thyristor driver unit is connected with the gate pole of said thyristor Q1 and the gate pole of thyristor Q2;
Said alternating current zero crossing is detecting unit constantly, is used for the AC signal at thyristor two ends is carried out zero passage detection;
Said AC signal peak value is detecting unit constantly, is used for isolation, amplification, LPF to AC signal, obtains ac small signal and sends into main control unit calculatings of sampling, and obtains the AC signal peak value moment;
Said main control unit; Be used to receive the alternating current zero crossing moment signal of alternating current zero crossing moment detecting unit acquisition, the peak values of ac moment signal of reception AC signal peak value moment detection; Produce control signal and control signal is sent to the thyristor driver unit, by the conducting of said thyristor Q1 of thyristor driver unit drives and thyristor Q2.
2. TSC switching control device according to claim 1 is characterized in that said main control unit is a single-chip microcomputer.
3. TSC switching control device according to claim 1 is characterized in that, said alternating current zero crossing detecting unit constantly adopts optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201809823U CN202503300U (en) | 2012-04-25 | 2012-04-25 | Tsc switching control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201809823U CN202503300U (en) | 2012-04-25 | 2012-04-25 | Tsc switching control device |
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| CN202503300U true CN202503300U (en) | 2012-10-24 |
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| CN2012201809823U Expired - Fee Related CN202503300U (en) | 2012-04-25 | 2012-04-25 | Tsc switching control device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242321A (en) * | 2014-09-17 | 2014-12-24 | 佛山市奥里斯特电气有限公司 | Switching unit control system of dynamic TSC filtering compensation device |
| CN104348172A (en) * | 2013-08-05 | 2015-02-11 | 青岛菲特电器科技有限公司 | High-capacity controllable reactor with cooperation of hierarchical and continuous control |
| CN115313412A (en) * | 2022-09-19 | 2022-11-08 | 广州华园智电科技有限公司 | Single-phase power capacitor rapid and safe switching method based on thyristor control strategy |
-
2012
- 2012-04-25 CN CN2012201809823U patent/CN202503300U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348172A (en) * | 2013-08-05 | 2015-02-11 | 青岛菲特电器科技有限公司 | High-capacity controllable reactor with cooperation of hierarchical and continuous control |
| CN104242321A (en) * | 2014-09-17 | 2014-12-24 | 佛山市奥里斯特电气有限公司 | Switching unit control system of dynamic TSC filtering compensation device |
| CN104242321B (en) * | 2014-09-17 | 2016-08-31 | 佛山市奥里斯特电气有限公司 | A kind of dynamically TSC filtering compensation device switching unit control system |
| CN115313412A (en) * | 2022-09-19 | 2022-11-08 | 广州华园智电科技有限公司 | Single-phase power capacitor rapid and safe switching method based on thyristor control strategy |
| CN115313412B (en) * | 2022-09-19 | 2023-09-29 | 广州华园智电科技有限公司 | Single-phase power capacitor rapid and safe switching method based on thyristor control strategy |
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Legal Events
| Date | Code | Title | Description |
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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 |
Granted publication date: 20121024 Termination date: 20150425 |
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| EXPY | Termination of patent right or utility model |