CN103825484B - One is novel forces commutation bridge road - Google Patents

One is novel forces commutation bridge road Download PDF

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Publication number
CN103825484B
CN103825484B CN201410081076.1A CN201410081076A CN103825484B CN 103825484 B CN103825484 B CN 103825484B CN 201410081076 A CN201410081076 A CN 201410081076A CN 103825484 B CN103825484 B CN 103825484B
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thyristor
electric capacity
commutation
conducting
bridge road
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CN103825484A (en
Inventor
郭春义
李春华
刘羽超
赵成勇
张庆国
李路遥
许韦华
阳岳希
井雨刚
张磊
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
North China Electric Power University
Global Energy Interconnection Research Institute
China EPRI Electric Power Engineering Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
North China Electric Power University
China EPRI Electric Power Engineering Co Ltd
Smart Grid Research Institute of SGCC
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Abstract

The invention provides and a kind of novelly force commutation bridge road, phase half brachium pontis on described commutation bridge road comprises two the thyristor strings be connected in parallel; Thyristor string comprises N+1 the thyristor be connected in series; In two thyristor strings, the negative electrode of the thyristor that electrical connection order is identical is connected by electric capacity; The number of electric capacity is that N, N are at least 2.Compared to the prior art, one provided by the invention is novel forces commutation bridge road, be applicable in conventional high-tension direct current transportation, not only can realize the reliable turn-off of thyristor under failure condition, and capacitor does not come into operation when converter valve normally works, therefore can not produce a large amount of harmonic wave, extend electric capacity useful life; Capacitor adopts hierarchical approaches simultaneously, is jointly born by the voltage that single electric capacity in commutation bridge road bears, solves the problem of withstand voltage of single electric capacity, reduce manufacturing cost and the parameter request of capacitor by N number of capacitor.

Description

One is novel forces commutation bridge road
Technical field
The present invention relates to power transmission and distribution technical field, be specifically related to one and force commutation bridge road.
Background technology
One phase half brachium pontis of conventional high-tension direct current transportation is made up of some Thyristors in series, and series thyristor can turn off under the effect of triggering signal in conducting simultaneously under normal circumstances; After under failure condition, between two brachium pontis, commutation terminates, just exit the valve of conducting within a period of time of reverse voltage effect, if fail to recover blocking ability, or commutation process is failed to carry out complete during reverse voltage always, all can cause threshold voltage be changed to positive to time all switched phase by the original predetermined valve exiting conducting by the valve of commutation, then can there is commutation failure.
Force commutation mainly to adopt the method for commutation capacitor discharge and recharge, apply back-pressure, to realize the change of current to the thyristor needing to turn off.In prior art, forced commutation circuit mainly comprises series inductance formula voltage source inverter and series diode formula current source inverter, although these two kinds of inverter topologies all can realize the reliable turn-off of thyristor under failure condition, but all putting into operation owing to forcing the electric capacity moment in commutation, a large amount of harmonic wave is produced when converter valve is normally worked, simultaneously along with the electric pressure of direct current transportation improves constantly, the electric capacity volume in access electrical power trans mission/distribution system and cost all can be very high.
Therefore, provide one significantly can reduce converter valve work harmonic wave, the forced commutation circuit extending electric capacity useful life seems particularly important.
Summary of the invention
In order to meet the needs of prior art, the invention provides and a kind of novelly force commutation bridge road, phase half brachium pontis on described commutation bridge road comprises two the thyristor strings be connected in parallel; Described thyristor string comprises N+1 the thyristor be connected in series; In two described thyristor strings, the negative electrode of the thyristor that electrical connection order is identical is connected by electric capacity; The number of described electric capacity is that N, N are at least 2.
Preferably, described half brachium pontis comprises four kinds of current flow paths; When converter valve normally works, current flow paths is the branch road that a thyristor string after triggering and conducting is formed, and another thyristor string and N number of described electric capacity do not work; During system jam, if a thyristor string can not turn off converter valve and cannot realize commutation, then be connected to the thyristor bearing forward voltage drop between electric capacity in another thyristor string of triggering and conducting, current flow paths is the branch road successively by the failed thyristor of capacitors conductive and the thyristor formation of triggering and conducting;
Preferably, when converter valve forces commutation, the capacitive electrode plates current potential be connected with the anode of the thyristor of described triggering and conducting is for just, and the capacitive electrode plates current potential be connected with the negative electrode of described thyristor is negative;
Preferably, when converter valve forces commutation, electric capacity automatic discharging-the charging be connected with described turn on thyristors, after converter valve forces commutation success, the capacitive electrode plates current potential be connected with the anode of the thyristor of described triggering and conducting is negative, and the capacitive electrode plates current potential be connected with the negative electrode of described thyristor is just;
Preferably, after converter valve forces commutation to terminate, the thyristor of its all conducting state all turns off voluntarily because bearing reverse voltage, commutation success.
Compared with immediate prior art, excellent effect of the present invention is:
1, one provided by the invention is novel forces commutation bridge road, by the N number of electric capacity of series connection between two thyristor strings, one phase half brachium pontis is divided into N+1 section, i.e. N+1 level topology, adopt capacitance grading mode, the voltage that single electric capacity in commutation bridge road bears is born jointly by N number of capacitor, solves the problem of withstand voltage of single electric capacity, reduce manufacturing cost and the parameter request of capacitor;
2, one provided by the invention is novel forces commutation bridge road, be applicable in conventional high-tension direct current transportation, not only can realize the reliable turn-off of thyristor under failure condition, and capacitor do not come into operation when converter valve normally works, therefore can not produce a large amount of harmonic wave, extend electric capacity useful life;
3, one provided by the invention is novel forces commutation bridge road, when not needing external power source, can realize electric capacity self-charging.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is: one provided by the invention is novel forces commutation bridge road topological diagram;
Fig. 2 is: a kind of novel three grades of topological diagrams forcing commutation bridge road in the embodiment of the present invention;
Fig. 3 is: the current flow paths figure forcing commutation bridge road when converter valve normally works in the embodiment of the present invention;
Fig. 4 is: the current flow paths figure forcing commutation bridge road in the embodiment of the present invention during converter valve commutation;
Fig. 5 is: force commutation bridge line state figure when converter valve forces commutation to complete in the embodiment of the present invention;
Fig. 6 is: after converter valve shown in Fig. 4 forces commutation to complete, converter valve again triggering and conducting time force commutation bridge current circulation path figure.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described.
The invention provides one and significantly can reduce converter valve work harmonic wave, extend the forced commutation circuit in electric capacity useful life, as shown in Figure 1, phase half brachium pontis on this commutation bridge road comprises two the thyristor strings be connected in parallel; Each thyristor string includes N+1 the thyristor be connected in series; In two thyristor strings, the negative electrode of two thyristors that electrical connection order is identical is connected by electric capacity; The number of electric capacity is that N, N are at least 2;
This phase half brachium pontis comprises four kinds of current flow paths:
When converter valve normally works, current flow paths is the branch road that a thyristor string after triggering and conducting is formed, and wherein another thyristor string and N number of electric capacity do not work;
System jam, if a thyristor string can not turn off, then be connected to the thyristor bearing forward voltage drop between electric capacity in another thyristor string of triggering and conducting, the capacitive electrode plates current potential be connected with the anode of this thyristor is just, be negative with the capacitive electrode plates current potential that the negative electrode of this thyristor is connected, now current flow paths is successively by the branch road of the thyristor formation of the failed thyristor of two capacitors conductive and triggering and conducting.
Phase half brachium pontis on commutation bridge road is forced to comprise by thyristor VT1, VT2, VT3 the first thyristor string in series as shown in Figure 2 in the present embodiment, the second thyristor string that thyristor VT1 ', VT2 ', VT3 ' are in series and electric capacity C 1, C 2.
When converter valve normally works, current flow paths is the branch road that first thyristor string VT1, VT2, VT3 after triggering and conducting is formed, the second thyristor string and electric capacity C 1, C 2do not work, as shown in Figure 3, now electric capacity C 1two terminal potentials are left positive right negative, electric capacity C 2the two negative right side, terminal potential left sides just.
Work as system jam, if first thyristor string VT1, VT2, VT3 can not turn off, converter valve can not reliably commutation, the thyristor VT2 ' in triggering and conducting second thyristor string, electric capacity C 1, C 2start electric discharge, thyristor VT1, electric capacity C 1, thyristor VT2 ', electric capacity C 2current flow paths is formed, as shown in Figure 4 with thyristor VT3; Through electric capacity C after a period of time 1, C 2charge by electric discharge, now electric capacity C 1the right side is just being born, electric capacity C in two terminal potential left sides 2two terminal potentials are left positive right negative, and thyristor VT1, thyristor VT2 ' and thyristor VT3 bear reverse voltage and turn off, and the first thyristor string and the second thyristor string all turn off immediately, commutation success.Described system is include the electric power system based on the converter valve of forcing commutation bridge road in the present embodiment.
Electric capacity C after one phase half brachium pontis commutation success 1, C 2state-of-charge as shown in Figure 5, when converter valve carries out commutation again, due to electric capacity C 1the right side is just being born, electric capacity C in two terminal potential left sides 2two terminal potentials are left positive right negative, the branch road that current flow paths is the second thyristor string VT1 ' after triggering and conducting, VT2 ', VT3 ' are formed; Work as system jam, if the second thyristor string VT1 ', VT2 ', VT3 ' can not turn off, the thyristor VT2 in triggering and conducting first thyristor string, electric capacity C 1, C 2start electric discharge, thyristor VT1 ', electric capacity C 1, thyristor VT2, electric capacity C 2current flow paths is formed, through electric capacity C after a period of time with thyristor VT3 ' 1, C 2charge by electric discharge, now electric capacity C 1two terminal potentials are left positive right negative, electric capacity C 2just, thyristor VT1 ', thyristor VT2 and thyristor VT3 ' bear reverse voltage and turn off, and the first thyristor string and the second thyristor string all turn off immediately, commutation success on the two negative right side, terminal potential left sides.Described system is include the electric power system based on the converter valve of forcing commutation bridge road in the present embodiment.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.

Claims (4)

1. novelly force a commutation bridge road, it is characterized in that, phase half brachium pontis on described commutation bridge road comprises two the thyristor strings be connected in parallel; Described thyristor string comprises N+1 the thyristor be connected in series; In two described thyristor strings, the negative electrode of the thyristor that electrical connection order is identical is connected by electric capacity; The number of described electric capacity is that N, N are at least 2;
Described half brachium pontis comprises four kinds of current flow paths; When converter valve normally works, current flow paths is the branch road that a thyristor string after triggering and conducting is formed, and another thyristor string and N number of described electric capacity do not work; During system jam, if a thyristor string can not turn off converter valve and cannot realize commutation, then be connected to the thyristor bearing forward voltage drop between electric capacity in another thyristor string of triggering and conducting, current flow paths is the branch road successively by the failed thyristor of capacitors conductive and the thyristor formation of triggering and conducting.
2. one as claimed in claim 1 is novel forces commutation bridge road, it is characterized in that, when converter valve forces commutation, the capacitive electrode plates current potential be connected with the anode of the thyristor of described triggering and conducting is for just, and the capacitive electrode plates current potential be connected with the negative electrode of the thyristor of described triggering and conducting is negative.
3. one as claimed in claim 2 is novel forces commutation bridge road, it is characterized in that, when converter valve forces commutation, electric capacity automatic discharging-the charging be connected with the thyristor of described triggering and conducting, after converter valve forces commutation success, the capacitive electrode plates current potential be connected with the anode of the thyristor of described triggering and conducting is negative, and the capacitive electrode plates current potential be connected with the negative electrode of the thyristor of described triggering and conducting is just.
4. one as claimed in claim 3 is novel forces commutation bridge road, and it is characterized in that, after converter valve forces commutation to terminate, the thyristor of its all conducting state all turns off voluntarily because bearing reverse voltage, commutation success.
CN201410081076.1A 2014-03-06 2014-03-06 One is novel forces commutation bridge road Active CN103825484B (en)

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Publication number Priority date Publication date Assignee Title
CN105811743A (en) * 2014-12-31 2016-07-27 国家电网公司 Auxiliary valve segment parallel capacitor type commutation bridge circuit improving LCC-HVDC commutation characteristic and method thereof
CN105811744A (en) * 2014-12-31 2016-07-27 国家电网公司 Auxiliary valve segment parallel capacitor type converter improving LCC-HVDC commutation characteristic and method thereof
CN105866602B (en) * 2016-06-08 2024-07-09 全球能源互联网研究院 Commutation failure defending device for high-voltage direct-current transmission converter valve

Citations (4)

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US4086622A (en) * 1975-09-18 1978-04-25 Siemens Aktiengesellschaft Frequency converter and method of operating same
SU1690135A1 (en) * 1989-06-26 1991-11-07 Ленинградский электротехнический институт им.В.И.Ульянова (Ленина) Method of controlling a series chopper with isolating diodes
US5287260A (en) * 1991-10-21 1994-02-15 Kabushiki Kaisha Toshiba GTO rectifier and inverter
CN103280989A (en) * 2013-05-15 2013-09-04 南京南瑞继保电气有限公司 Current converter and control method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086622A (en) * 1975-09-18 1978-04-25 Siemens Aktiengesellschaft Frequency converter and method of operating same
SU1690135A1 (en) * 1989-06-26 1991-11-07 Ленинградский электротехнический институт им.В.И.Ульянова (Ленина) Method of controlling a series chopper with isolating diodes
US5287260A (en) * 1991-10-21 1994-02-15 Kabushiki Kaisha Toshiba GTO rectifier and inverter
CN103280989A (en) * 2013-05-15 2013-09-04 南京南瑞继保电气有限公司 Current converter and control method thereof

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Title
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