CN104242319A - Method for acquiring thyristor switched capacitor trigger pulses - Google Patents
Method for acquiring thyristor switched capacitor trigger pulses Download PDFInfo
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- CN104242319A CN104242319A CN201310250078.4A CN201310250078A CN104242319A CN 104242319 A CN104242319 A CN 104242319A CN 201310250078 A CN201310250078 A CN 201310250078A CN 104242319 A CN104242319 A CN 104242319A
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- thyristor
- trigger impulse
- implementation method
- series
- valve block
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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
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a method for acquiring thyristor switched capacitor trigger pulses. A thyristor valve block is formed by connecting multiple thyristors in series. The method for acquiring the thyristor switched capacitor trigger pulses includes the steps that when the forward voltage of the thyristor valve block is formed, high-potential control units corresponding to the thyristors connected in series acquire energy from a damping circuit of the valve block, a reporting pulse is sent out when energy is acquired by each high-potential control unit, and the reporting pulses are detected by a control device and counted; in set time, after the number of the reporting pulses received by the control device reaches a set value, the trigger pulses are sent out. According to the method, when self-energy-acquisition of the high-potential control units on the thyristor valve block is successful, it can be guaranteed that the trigger pulses are sent out at a zero crossing point with the voltage close to that of the valve block and each power frequency period can be continuously triggered.
Description
Technical field
The invention belongs to field of power electronics, particularly a kind of implementation method of thyristor switchable capacitor trigger impulse and the thyristor switchable capacitor device of employing the method.
Background technology
Thyristor switchable capacitor (TSC) is a kind of conventional static passive compensation device.Its rated operational voltage of high pressure TSC device 6 kilovolts and more than, because it can realize the zero passage excision of dropping into without inrush current of high-voltage parallel capacitor and electric current, so the inrush phenomenon and switching overvoltage problem that mechanical switch switched capacitor brings can be solved well, improve the useful life of equipment.Except can realizing all functions of traditional mechanical switched capacitor device, TSC device has fast-response, frequent movement etc. because of it, is specially adapted to the dynamic passive compensation field of large-scale impact, fast cycle fluctuation change, non-linear even load.
Three-phase TSC has various topological structures, the present invention the topology that is suitable for be three facies-controlled Δ (triangle) modes of connection, as shown in Figure 1, be the antiparallel mode of connection of thyristor controlled series compensation.In current high pressure TSC device, the high potential control unit (TCU) of thyristor controlled series compensation mostly adopts the mode of current energy-taking, by the additional high pressure loop power supply of outside, according to the quantity of TCU be connected in series in the loop multiple get can instrument transformer (CT), the load of CT is TCU, from auxiliary energy supply loop, extract electric current get energy to TCU, to publish the article the research of thyristor high frequency energy supplying system " in a kind of TSC type SVC " see " power electronic technology " magazine and the patent No. is the patent of 200510068193.5 " a kind of current energy-taking once loops of thyristor valve of controllable series compensator ".
The thyristor controlled series compensation adopting this kind to get energy mode needs Design assistant loop, complex structure, bulky.Meanwhile, electric pressure is higher, and it is all the more outstanding that problem is put in the insulation drawn game of subsidiary loop.
Summary of the invention
Object of the present invention, be the implementation method that a kind of thyristor switchable capacitor trigger impulse is provided, the while that it can guaranteeing that high potential control unit self-energizing on thyristor controlled series compensation is successful, send trigger impulse at the zero crossing close to valve group voltage, and guarantee that each power frequency period can continuous trigger.
In order to reach above-mentioned purpose, solution of the present invention is:
An implementation method for thyristor switchable capacitor trigger impulse, described thyristor controlled series compensation is made up of several Thyristors in series; The content of described implementation method is: when thyristor controlled series compensation forward voltage is set up, the high potential control unit corresponding to thyristors at different levels of series connection is got from the damping circuit of valve group can, get while completing and send a return pulse, control appliance detects return pulse, and adds up number; In setting-up time, after the return pulse number received when control appliance reaches set point, send trigger impulse.
Above-mentioned return step-by-step counting set point equals thyristor controlled series compensation series thyristor progression and deducts redundancy progression.
The setting-up time of above-mentioned statistics return pulse number is 50us ~ 500us.
Above-mentioned trigger impulse is made up of the pulse train at one fixed width and interval, trigger impulse sequence time duration, pulse duration and interpulse period the needs meeting valve group and reliably trigger are set.
After adopting such scheme, the present invention is the problem solving current energy-taking, the TCU of thyristor controlled series compensation adopts the mode of coupling self-energizing, the damping circuit configured by thyristor two ends obtains energy from system voltage, to ensure the normal work of TCU circuit, and triggering institute energy requirement is provided, there is following characteristics:
(1) thyristor controlled series compensation of this coupling energy taking type TSC device is simple for structure, without the need to additional auxiliary energy supply loop, is applicable to the realization of high voltage large capcity device;
(2) adopt the method, trigger instants is close to the zero crossing of valve group voltage.When certain grade of transistors breakdown of thyristor controlled series compensation or TCU fault are without return pulse, do not affect the triggering with all the other thyristors a string, meet the redundancy requirement of thyristor controlled series compensation;
(3) the method also eliminates TCU and gets the inconsistency of energy time to the impact triggered, get the first conducting of the thyristor corresponding to TCU that can comparatively fast complete, system alternating voltage by be all added in do not complete get can TCU on, that can accelerate this TCU gets Energy velocity, and trigger impulse maintenance one fixed width can guarantee that the more late TCU getting energy also can trigger thyristor in time simultaneously;
(4) adopt the TSC device of the method, a small amount of harmonic current produced suppresses by series reactor.The method, without the need to phase-locked to AC system voltage, adopts programmable logic device to realize.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the three-phase thyristor switched capacitor that the present invention is suitable for;
Fig. 2 is the electrical block diagram of AB phase valve group first order thyristor;
Fig. 3 is high potential control unit return pulse schematic diagram;
Fig. 4 is that trigger impulse realizes schematic diagram;
Fig. 5 is TSC voltage current waveform schematic diagram;
Wherein, the abscissa of 4 subgraphs is consistent, is all time shaft, unit: s; The ordinate of figure (a) is AC system voltage, unit: kV; The ordinate of figure (b) is valve group voltage, unit: kV; The ordinate of figure (c) is electric current in Δ wiring, unit: A; The ordinate of figure (d) is Δ wiring extrinsic current, unit: A.
Embodiment
The invention provides a kind of implementation method of thyristor switchable capacitor trigger impulse, described thyristor controlled series compensation is formed by several Thyristors in series, the content of described method is: when thyristor controlled series compensation forward voltage is set up, the high potential control unit (TCU) corresponding to thyristors at different levels of series connection is got from valve group damping circuit can, get while completing and send a return pulse, control appliance detects return pulse, and adds up number; In setting-up time (usual value 50 ~ 500 μ s), if the return pulse number that control appliance receives reaches set point (value is that the progression of thyristor controlled series compensation series thyristor deducts redundancy progression), send trigger impulse, described trigger impulse is made up of the pulse train at one fixed width and interval, and the sequence time duration of trigger impulse, pulse duration and interpulse period the needs meeting valve group and reliably trigger are set.
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
As shown in Figure 2, for the first order thyristor of AB phase valve group, at the positive half cycle of voltage, the thyristor on right side bears forward voltage, after voltage over zero in very short time, high potential control unit TCU_1+ complete get can and send return pulse IP_1+, see Fig. 3; Equally, at the negative half period of voltage, in Fig. 2, the thyristor in left side bears forward voltage, after voltage over zero in very short time, high potential control unit TCU_1-complete get can and send return pulse IP_1-(as shown in Figure 3).
As shown in Figure 4, when control appliance detects first return pulse, a very short detection window is launched.In detection window, the return pulse sent with the TCU in a string valve group is added up.If receive return pulse number when reaching set point, send trigger impulse immediately, the series connection progression that counting set point can get valve group deducts redundancy progression.If the return pulse number counted in detection window does not reach counting set point, then do not trigger.Trigger impulse is pulse train, and the pulse duration, pulse duration and and the interval of pulse train all can arrange.
Adopt the method, due to trigger impulse close to valve group voltage over zero but not actual zero crossing send, therefore, a small amount of harmonic current can be produced, but these harmonic currents suppress by suitable reactor of connecting.Simulation waveform shown in Fig. 5, TSC valve group can normal periodic trigger, and by series reactance, current harmonics is well suppressed.
The present invention had both met the requirement of high potential control unit coupling energy taking, make again the trigger instants of thyristor controlled series compensation close to the zero crossing of valve group voltage, the actual operation requirements of thyristor series capacitor can be met, and without the need to phase-locked to AC system voltage, adopt programmable logic device conveniently to realize.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (4)
1. an implementation method for thyristor switchable capacitor trigger impulse, described thyristor controlled series compensation is made up of several Thyristors in series; It is characterized in that the content of described implementation method is: when thyristor controlled series compensation forward voltage is set up, the high potential control unit corresponding to thyristors at different levels of series connection is got from the damping circuit of valve group can, get while completing and send a return pulse, control appliance detects return pulse, and adds up number; In setting-up time, after the return pulse number received when control appliance reaches set point, send trigger impulse.
2. the implementation method of a kind of thyristor switchable capacitor trigger impulse as claimed in claim 1, is characterized in that: described return step-by-step counting set point equals thyristor controlled series compensation series thyristor progression and deducts redundancy progression.
3. the implementation method of a kind of thyristor switchable capacitor trigger impulse as claimed in claim 1, is characterized in that: the setting-up time of described statistics return pulse number is 50us ~ 500us.
4. the implementation method of a kind of thyristor switchable capacitor trigger impulse as claimed in claim 3, it is characterized in that: described trigger impulse is made up of the pulse train at one fixed width and interval, trigger impulse sequence time duration, pulse duration and interpulse period the needs meeting valve group and reliably trigger are set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310250078.4A CN104242319A (en) | 2013-06-21 | 2013-06-21 | Method for acquiring thyristor switched capacitor trigger pulses |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310250078.4A CN104242319A (en) | 2013-06-21 | 2013-06-21 | Method for acquiring thyristor switched capacitor trigger pulses |
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| CN104242319A true CN104242319A (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310250078.4A Pending CN104242319A (en) | 2013-06-21 | 2013-06-21 | Method for acquiring thyristor switched capacitor trigger pulses |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253307A (en) * | 2016-08-17 | 2016-12-21 | 南京南瑞继保电气有限公司 | A kind of redundant data system of selection of redundancy control system |
| CN111351990A (en) * | 2020-04-07 | 2020-06-30 | 国网江苏省电力有限公司检修分公司 | Method and system for testing trigger pulse of direct-current transmission electric signal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5355076A (en) * | 1991-04-25 | 1994-10-11 | General Electric Company | Phase controlled capacitor for series compensation of a high voltage transmission line |
| CN101834537A (en) * | 2009-12-11 | 2010-09-15 | 中电普瑞科技有限公司 | High potential electron plate of thyristor valve |
-
2013
- 2013-06-21 CN CN201310250078.4A patent/CN104242319A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5355076A (en) * | 1991-04-25 | 1994-10-11 | General Electric Company | Phase controlled capacitor for series compensation of a high voltage transmission line |
| CN101834537A (en) * | 2009-12-11 | 2010-09-15 | 中电普瑞科技有限公司 | High potential electron plate of thyristor valve |
Non-Patent Citations (2)
| Title |
|---|
| 李宏: "SVC阀基电子及晶闸管高电位控制系统的研究", 《中国优秀博士学位论文全文数据库工程科技Ⅱ辑》, 15 March 2013 (2013-03-15), pages 1 - 58 * |
| 童路等: "静止无功补偿器中的晶闸管阀组设计", 《电力电容器与无功补偿》, vol. 32, no. 1, 28 February 2011 (2011-02-28), pages 33 - 37 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253307A (en) * | 2016-08-17 | 2016-12-21 | 南京南瑞继保电气有限公司 | A kind of redundant data system of selection of redundancy control system |
| CN106253307B (en) * | 2016-08-17 | 2018-07-20 | 南京南瑞继保电气有限公司 | A kind of redundant data selection method of redundancy control system |
| CN111351990A (en) * | 2020-04-07 | 2020-06-30 | 国网江苏省电力有限公司检修分公司 | Method and system for testing trigger pulse of direct-current transmission electric signal |
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Application publication date: 20141224 |