CN102332725B - High potential gate control device for series thyristor valve block in SVC (Static Var Compensator) - Google Patents
High potential gate control device for series thyristor valve block in SVC (Static Var Compensator) Download PDFInfo
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- CN102332725B CN102332725B CN2010102295589A CN201010229558A CN102332725B CN 102332725 B CN102332725 B CN 102332725B CN 2010102295589 A CN2010102295589 A CN 2010102295589A CN 201010229558 A CN201010229558 A CN 201010229558A CN 102332725 B CN102332725 B CN 102332725B
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Abstract
The invention relates to a high potential gate control device for a series thyristor valve block in an SVC (Static Var Compensator). The device comprises a plurality of gate control modules, a control unit, an energy acquiring unit, a photoelectric conversion unit, a voltage detection unit and a protection unit, wherein each gate control module is used for controlling two thyristors which respectively correspond to the gate control module; the control unit is used for triggering the thyristors according to a trigger command, acquiring and transmitting state information of the thyristors to the photoelectric conversion unit and transmitting alarm information according to detection information of the voltage detection unit; the energy acquiring unit is used for supplying power to the control unit; the photoelectric conversion unit is used for photoelectrically converting and uploading the rexeived trigger command and the state information of the thyristors; the voltage detection unit is used for detecting the voltage of the energy acquiring unit and transmitting the detection information to the control unit; and the protection unit is used for carrying out voltage breakdown protection on the thyristors. The device disclosed by the invention has the advantages of high integrated level, high reliability and low power consumption and can be used for providing sound control and protection for a high-voltage series thyristor valve block in the SVC system.
Description
Technical field
The present invention relates to electric and electronic technical field, relate in particular to the series thyristor valve group high potential gate pole control device of a kind of 6kV of being applicable to the 66kV electric pressure.
Background technology
Along with the development of national economy and the progress of state-of-the-art technology, the power network load sharply increases, and idle requirement is also feared and increased with day to the electrical network perception.Particularly along with the continuous increase as the impact loads such as reversible heavy (merchant) mill, electric furnace arrangement for producing steel, nonlinear-load capacity, add power electronics and micro-power technology of generally application, make the problems such as power network generation voltage waveform distortion, voltage fluctuation flickering and three-phase imbalance, the generation quality of power supply reduces, power factor of electric network reduces, the harmful effects such as via net loss increase.The Static Type Dynamic Reactive Compensation Device that developed recently gets up (Static Var Compensator, SVC) is a kind of device of quick adjustment reactive power, and successful should be in the compensation of the loads such as electric power system, metallurgy, mining and electric railway.And thyristor-controlled reactor type (claim TCR type) SVC realizes that by thyristor control linear reactor very fast, continuous reactive power regulates, due to it have the reaction time fast (5～20ms), reliable, stepless compensation, phase-splitting regulate, can balance the advantage such as meritorious, applied widely and low price.The TCR device can also be realized a minute phase control, the ability that suppresses preferably asymmetric load is arranged, thereby it is most widely used.SVC is connected in system, capacitor provides fixedly capacitive reactive power Qc, the electric current of the compensation reactor by having intact linear character has determined from the idle value Qtcr of perception of compensation reactor output, perception is idle to be offseted with capacitive reactive power, as long as Qn (system)=Qv (load)-Qc+Qtcr=steady state value (or 0), power factor just can keep constant, and voltage fluctuates hardly.Control system the most important thing is accurately to control thyristor and triggers, and obtains the electric current of required reactor.According to the electric current and the voltage that gather, draw afterwards as calculated the reactive power that will compensate, send trigger impulse, by Optical Fiber Transmission, trigger thyristor after high potential gate pole control unit, the reactive power that obtains compensating.
Summary of the invention
(1) technical problem
The technical problem to be solved in the present invention is: the control protective unit that the high voltage tandem thyristor valve group that a kind of integrated level is high, reliability is high, low in energy consumption is provided.
(2) technical scheme
For reaching described purpose, the invention provides a kind of SVC system series thyristor valve group high potential gate pole control device, this device comprises some gate pole control modules, each described gate pole control module is for controlling two thyristors corresponding with it, described gate pole control module comprises: control unit, for according to trigger command, triggering thyristor, gather and send the state information of thyristor to photoelectric conversion unit, and according to the detection delivering warning information of voltage detection unit; Get the energy unit, be used to described control unit power supply; Photoelectric conversion unit, carry out opto-electronic conversion and send to described control unit for the described trigger command to receiving, and the thyristor state information of described control unit collection is carried out the electric light conversion and uploaded; Voltage detection unit, for detection of the described voltage of getting the energy unit, and be sent to described control unit by detection information; Protected location, for carrying out the voltage breakdown protection to thyristor;
Wherein, also comprise multimode fiber, for as described photoelectric conversion unit, receiving described trigger command and uploading the transmission medium of described thyristor state information.
Wherein, described control unit is CPLD.
Wherein, described getting can consist of the dynamic voltage balancing loop unit, described dynamic voltage balancing loop forms by dynamic voltage balancing electric capacity and dynamic voltage balancing resistance series damped loop in series is in parallel with thyristor, each series connection of two ends, described series damped loop belongs to respectively the electrochemical capacitor of two described gate pole control modules, is provided with two electrochemical capacitors for energy storage in each described gate pole control module.
Wherein, described photoelectric conversion unit further comprises: the opto-electronic conversion subelement, carry out opto-electronic conversion and be sent to described control unit for the described trigger command to receiving; Electric light conversion subelement, carry out the electric light conversion and upload for the state information of the described thyristor to receiving.
Wherein, described voltage detection unit consists of comparator, the first diode and the second diode, wherein, the positive input terminal of described comparator is connected with the positive pole anodal and the second diode of the first diode respectively, negative input end is connected to reference voltage by the first divider resistance, described negative input end also is connected with the negative voltage input of described comparator by the second divider resistance, and the positive voltage input is connected with reference voltage, and output is connected with described control unit; Described the first diode cathode can be connected unit with described getting; Described the second diode cathode connects reference voltage.
Wherein, described reference voltage is+5V.
Wherein, described protected location is breakdown diode BOD element.
(3) beneficial effect
SVC system series thyristor valve group of the present invention, with high potential gate pole control device, is communicated by letter with the valve base electronic unit by multimode fiber, can realize the high potential isolation; Adopt CPLD (the Complex Programmable Logic Device of micro-power consumption, CPLD), as the master control logic element, have the advantages that the printed circuit board area is little, power consumption is little, logic configuration is flexible, integrated level is high, anti-electromagnetic interference capability is strong and reliability is high; After adopting the BOD device series connection that voltage is lower, form the voltage breakdown protection to thyristor, when having reduced cost, the thyristor valve group is played to good overvoltage protection.Device of the present invention has great importance and practical value to the upgrading that promotes existing high potential gate pole control unit.
The accompanying drawing explanation
Fig. 1 uses the logic connection diagram of high potential gate pole control device according to the SVC system series thyristor valve group of one embodiment of the present invention;
Fig. 2 uses the gate pole control module of high potential gate pole control device to form block diagram according to the SVC system series thyristor valve group of one embodiment of the present invention;
Fig. 3 for can element circuit according to getting of one embodiment of the present invention gate pole control module schematic diagram;
Fig. 4 (a)-(b) is the photoelectric conversion unit circuit diagram according to one embodiment of the present invention gate pole control module;
Fig. 5 is the voltage detection unit circuit diagram according to one embodiment of the present invention gate pole control module;
Fig. 6 is the protected location circuit diagram according to one embodiment of the present invention gate pole control module.
Embodiment
SVC system series thyristor valve group of the present invention, with high potential gate pole control device, is described in detail as follows in conjunction with the accompanying drawings and embodiments.
Be illustrated in figure 1 the logic connection diagram of using high potential gate pole control device according to the SVC system series thyristor valve group of one embodiment of the present invention, this device comprises some gate pole control modules (G1～G5), each gate pole control module is for controlling two thyristors corresponding with it, these two thyristors belong to two thyristors pair, each thyristor forms two thyristors by linking together with positive and negative parallel way, and the thyristor of a plurality of series connection is to forming the series thyristor valve group of SVC system.Valve base electronic unit (VBE) in the SVC system for to the gate pole control device, sending trigger command.Specific to each gate pole control module, it can preferably receive respectively the triggering light signal of valve base electronic unit by the multimode fiber of the optical fiber connector (PC/ST), (adopt the communication mode of multimode fiber, realize high potential isolation) this light signal is after inner photoelectric conversion signal is processed, according to controlling, require to trigger one or two coupled thyristor, and the state information of adopting thyristor, then, after it is carried out to the electric light conversion, be sent to the valve base electronic unit.According to the electric pressure difference, the thyristor of series connection, to the quantity difference, supposes that the thyristor of series connection, to for N, needs gate pole control device of the present invention to have N+1 gate pole control module at least so.
SVC system series thyristor valve group according to one embodiment of the present invention comprises above-mentioned some gate pole control modules with high potential gate pole control device; as shown in Figure 2, each gate pole control module comprises: control unit, get the energy unit; photoelectric conversion unit, voltage detection unit and protected location.Wherein:
Control unit, for the trigger command according to receiving, trigger thyristor, gather and send the state information of thyristor, and according to the detection delivering warning information of voltage detection unit, preferably this control unit is CPLD, have that printed circuit board is few, power consumption is little, logic configuration is flexible, integrated level is high, and anti-electromagnetic interference capability is strong, the characteristics that reliability is high.
Get the energy unit, adopt the dynamic voltage balancing loop to carry out high potential energy collecting, for control unit supplies working power, as shown in Figure 3, get and can by the dynamic voltage balancing loop, be formed unit, after the dynamic voltage balancing loop is connected in series by dynamic voltage balancing capacitor C 5 and dynamic voltage balancing resistance R 1, with thyristor, form in parallel, after dynamic voltage balancing capacitor C 5 is connected in series with dynamic voltage balancing resistance R 1, connect respectively and belong to respectively the electrochemical capacitor of two gate pole control modules in two ends, not C3 and C2 in figure, like this, at positive half wave, pass through R1, C5 series damped loop is the C3 charging, the C3 electric discharge provides power supply for control unit, negative half-wave is the C2 charging by R1, C5 series damped loop, the C2 electric discharge provides power supply for control unit, and each gate pole control module arranges two electrochemical capacitors for energy storage, like this, guarantee that each half-wave all has electric energy to provide to control unit period, has guaranteed the normal operation of control device.
Photoelectric conversion unit, for trigger command is carried out opto-electronic conversion and sends to control unit, and the thyristor state information of control unit collection is carried out to the electric light conversion and uploaded, photoelectric conversion unit further comprises: the opto-electronic conversion subelement, its circuit forms as shown in Fig. 4 (a), for trigger command that the valve base electronic unit that receives is sent, carry out opto-electronic conversion and be sent to the CPLD of control unit through optical receiver U5, this signal is used for triggering thyristor again after signal is processed; Electric light conversion subelement, circuit forms as shown in Fig. 4 (b), carries out the electric light conversion and is uploaded to the valve base electronic unit through optical transmitting set U4 for the thyristor state information that CPLD is collected.
Voltage detection unit, for detection of getting the energy cell voltage, and be sent to control unit by detection information.As shown in Figure 5, this voltage detection unit main circuit constitutes: comparator U1A, comparator U1A positive input terminal U1A-3 is connected with the positive pole of the first diode D3 and the second diode D4, the reference voltage of negative input end U1A-2 connection+5V, output U1A-1 is connected with control unit, by the CPLD of the voltage response of getting the energy unit of detection to described control unit; The first diode D3 negative pole can unit be connected with getting; The second diode D4, negative pole connect equally+reference voltage of 5V.When getting the normal operation of energy unit, voltage is higher than the reverse cut-ff voltage of the first diode D3, the D3 conducting, the second diode D4 conducting voltage anteposition is to 5V, enter comparator U1A-3 pin voltage and keep 5V, the U1A-2 pin keeps 2.5V after resistance R 5, R7 dividing potential drop, comparator U1A-1 pin output high level is to CPLD, and repayment is to the valve base electronic unit; When getting energy voltage circuit lower voltage lower than the reverse cut-ff voltage of D3, after D3, position voltage is 0, enters the lower voltage of U1A-3 pin, when its voltage of 2.5V lower than the U1A-2 pin, comparator U1A-1 pin output low level is to CPLD, and repayment is to the valve base electronic unit.
Protected location; for thyristor is carried out to the voltage breakdown protection; as shown in Figure 6; protected location forms the voltage breakdown protection (VBO) to thyristor after adopting breakdown diode (BOD) element that voltage is lower; the BOD element is connected in parallel on the thyristor two ends; when thyristor during to the overtension at two ends; the BOD component breakdown; give thyristor T gate pole triggering signal; make thyristor T force conducting; prevent thyristor T over-voltage breakdown, when having reduced cost, thyristor is played to good overvoltage protection.
Above execution mode is only be used to illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (7)
1. a SVC system series thyristor valve group, with high potential gate pole control device, is characterized in that, this device comprises some gate pole control modules, and each described gate pole control module is for controlling two thyristors corresponding with it, and described gate pole control module comprises:
Control unit, for according to trigger command, triggering thyristor, gather and send the state information of thyristor to photoelectric conversion unit, and according to the detection delivering warning information of voltage detection unit;
Get the energy unit, be used to described control unit power supply;
Photoelectric conversion unit, carry out opto-electronic conversion and send to described control unit for the described trigger command to receiving, and the thyristor state information of described control unit collection is carried out the electric light conversion and uploaded;
Voltage detection unit, for detection of the described voltage of getting the energy unit, and be sent to described control unit by detection information;
Described voltage detection unit consists of comparator, the first diode and the second diode, wherein, the positive input terminal of described comparator is connected with the positive pole anodal and the second diode of the first diode respectively, negative input end is connected to reference voltage by the first divider resistance, described negative input end also is connected with the negative voltage input of described comparator by the second divider resistance, the positive voltage input is connected with reference voltage, and output is connected with described control unit; Described the first diode cathode can be connected unit with described getting; Described the second diode cathode connects reference voltage;
Wherein, when described getting can unit during normal operation, its voltage is higher than the reverse cut-ff voltage of described the first diode, described the first diode current flow;
Protected location, for carrying out the voltage breakdown protection to thyristor.
2. SVC system series thyristor valve group as claimed in claim 1 is with high potential gate pole control device, it is characterized in that, also comprise multimode fiber, for as described photoelectric conversion unit, receiving described trigger command and uploading the transmission medium of described thyristor state information.
3. SVC system series thyristor valve group as claimed in claim 1, with high potential gate pole control device, is characterized in that, described control unit is CPLD.
4. SVC system series thyristor valve group as claimed in claim 1 is with high potential gate pole control device, it is characterized in that, described getting can consist of the dynamic voltage balancing loop unit, described dynamic voltage balancing loop forms by dynamic voltage balancing electric capacity and dynamic voltage balancing resistance series damped loop in series is in parallel with thyristor, each series connection of two ends, described series damped loop belongs to respectively the electrochemical capacitor of two described gate pole control modules, is provided with two electrochemical capacitors for energy storage in each described gate pole control module.
5. SVC system series thyristor valve group as claimed in claim 1, with high potential gate pole control device, is characterized in that, described photoelectric conversion unit further comprises:
The opto-electronic conversion subelement, carry out opto-electronic conversion and be sent to described control unit for the described trigger command to receiving;
Electric light conversion subelement, carry out the electric light conversion and upload for the state information of the described thyristor to receiving.
6. SVC system series thyristor valve group as claimed in claim 1, with high potential gate pole control device, is characterized in that, described reference voltage is+5V.
7. SVC system series thyristor valve group as claimed in claim 1, with high potential gate pole control device, is characterized in that, described protected location is breakdown diode BOD element.
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| CN2010102295589A CN102332725B (en) | 2010-07-12 | 2010-07-12 | High potential gate control device for series thyristor valve block in SVC (Static Var Compensator) |
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| CN2010102295589A CN102332725B (en) | 2010-07-12 | 2010-07-12 | High potential gate control device for series thyristor valve block in SVC (Static Var Compensator) |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105932694A (en) * | 2016-07-07 | 2016-09-07 | 安徽众升电力科技有限公司 | Static var compensator controller |
| CN106099944A (en) * | 2016-07-07 | 2016-11-09 | 安徽众升电力科技有限公司 | Reactive power compensator based on DSP |
| CN107664739B (en) * | 2016-07-28 | 2021-01-15 | 全球能源互联网研究院 | HVDC thyristor level damping resistor dynamic parameter online monitoring method |
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| US4348631A (en) * | 1981-06-04 | 1982-09-07 | Westinghouse Electric Corp. | Static VAR generator |
| CN1767306A (en) * | 2005-09-13 | 2006-05-03 | 中国电力科学研究院 | Photoelectricity triggering and detecting system for static reactive-load compensation equipment based on multi-mode optical fibre |
| CN101447668A (en) * | 2008-12-17 | 2009-06-03 | 中国电力科学研究院 | Device for breakdown diode to initiatively trigger bypass of thyristor valve string |
| CN101651414A (en) * | 2009-09-24 | 2010-02-17 | 中电普瑞科技有限公司 | Energy gaining circuit of thyristor valve electronic triggering plate for flexible transmission device |
| CN101673951A (en) * | 2009-10-15 | 2010-03-17 | 中国电力科学研究院 | Thyristor valve triggering and monitoring system |
| CN201438693U (en) * | 2009-08-24 | 2010-04-14 | 中国电力科学研究院 | Thyristor valve electronic trigger unit based on programmable logic technology |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006271070A (en) * | 2005-03-23 | 2006-10-05 | Toshiba Mitsubishi-Electric Industrial System Corp | Thyristor controlled reactor based svc device |
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| US4348631A (en) * | 1981-06-04 | 1982-09-07 | Westinghouse Electric Corp. | Static VAR generator |
| CN1767306A (en) * | 2005-09-13 | 2006-05-03 | 中国电力科学研究院 | Photoelectricity triggering and detecting system for static reactive-load compensation equipment based on multi-mode optical fibre |
| CN101447668A (en) * | 2008-12-17 | 2009-06-03 | 中国电力科学研究院 | Device for breakdown diode to initiatively trigger bypass of thyristor valve string |
| CN201438693U (en) * | 2009-08-24 | 2010-04-14 | 中国电力科学研究院 | Thyristor valve electronic trigger unit based on programmable logic technology |
| CN101651414A (en) * | 2009-09-24 | 2010-02-17 | 中电普瑞科技有限公司 | Energy gaining circuit of thyristor valve electronic triggering plate for flexible transmission device |
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