CN104237754A - Method and device for bridge arm to form equipotential body in converter valve - Google Patents
Method and device for bridge arm to form equipotential body in converter valve Download PDFInfo
- Publication number
- CN104237754A CN104237754A CN201410503608.6A CN201410503608A CN104237754A CN 104237754 A CN104237754 A CN 104237754A CN 201410503608 A CN201410503608 A CN 201410503608A CN 104237754 A CN104237754 A CN 104237754A
- Authority
- CN
- China
- Prior art keywords
- valve tower
- valve
- series resonance
- brachium pontis
- transistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses a device for a bridge arm to form an equipotential body in a converter body. The device comprises the bridge arm, a first kind of short-circuit components and a second type of short-circuit components; the bridge arm comprises at least one valve tower, each valve tower comprises at least two valve tower layers, the neighboring valve tower layers in each valve tower are serially connected, each valve tower layer comprises at least two submodules, the neighboring submodules are serially connected, and each submodule comprises an outlet terminal and an inlet terminal; one short-circuit component of the first kind is arranged between the outlet terminal and the inlet terminal of one submodule, and one short-circuit component of the second kind is arranged between the inlet terminal and the outlet terminal of one valve tower layer.
Description
Technical field
The present invention relates to electric field, particularly relate to method and device that a kind of converter valve bridge arm forms equipotential body.
Background technology
In existing flexible DC power transmission engineering, converter valve mainly adopts MMC (Modular MultilevelConverter, modularization multi-level converter), wherein, converter valve is the nucleus equipment of DC transmission engineering, by successively three-phase alternating voltage being connected to the DC voltage that DC terminal obtains expecting and the control realized power; MMC is a kind of novel voltage conversion circuit, and it can superpose the voltage that output is very high by by the mode of multiple sub module cascade, and has that output harmonic wave is few, degree of modularity high, is thus with a wide range of applications in electric system.Converter valve is made up of multiple brachium pontis (being generally 6 brachium pontis), each brachium pontis is connected by N number of valve tower, wherein by M, (voltage is higher again for each valve tower, M is more, as when voltage be 200kV, M is 90) individual submodule composition, wherein the single submodule of sub module cascade has full-bridge and half-bridge two kinds of structures; Wherein, full bridge structure is suitable for AC/AC (DC-to-DC) conversion, is also called cascaded H-bridges (Cascade H Bridge, CHB); The submodule of modular multilevel converter type direct current transmission system generally adopts half-bridge structure.Fig. 1 shows the structure of half-bridge converter valve, and with reference to Fig. 1, each upper brachium pontis or lower brachium pontis are made up of n SM cascade, an inductance L 0 of connecting respectively between upper and lower bridge arm.
Above-mentioned converter valve operationally can superpose the very high voltage of output, in order to the safety of equipment and personnel will carry out testing the voltage endurance capability of converter valve, wherein withstand voltage test is that inspection electrical equipment, electrical equipment, electric device, electric wiring and electrical safety apparatus etc. bear one of main method of superpotential ability; Withstand voltage test can find converter valve humidified insulation effectively, the general defect such as dirty, or dissociating property of local devices defect and insulation ag(e)ing have very important practical significance, in order to prevent causing damage to converter valve in experimentation, the brachium pontis of tested converter valve part must be made before the test to form equipotential body, its insulativity of voltage official post can not be produced like this destroyed in withstand voltage test; Therefore the brachium pontis of underproof converter valve part how is made to form equipotential body most important for withstand voltage test.
Therefore, under how in flexible DC power transmission engineering, converter valve adopts modularization multi-level converter, making converter valve bridge arm form equipotential body, is those skilled in the art's technical issues that need to address.
Summary of the invention
The object of this invention is to provide the device that a kind of converter valve bridge arm forms equipotential body, this device under converter valve employing modularization multi-level converter, can make converter valve bridge arm form equipotential body in flexible DC power transmission engineering; Another object of the present invention is to provide a kind of method that converter valve bridge arm forms equipotential body.
For solving the problems of the technologies described above, the invention provides the device that a kind of converter valve bridge arm forms equipotential body, this device comprises: brachium pontis, first kind shorting member, Equations of The Second Kind shorting member;
Described brachium pontis comprises at least one valve tower, each valve tower comprises at least two valve tower layers, is connected in series in each valve tower between adjacent valve tower layer, and each valve tower layer comprises at least two submodules, between adjacent submodule, series connection is connected, and described submodule comprises outlet level and lambda line level;
Wherein, a described first kind shorting member is arranged between the outlet level of a described submodule and lambda line level;
Between the lead-in wire terminal that described Equations of The Second Kind shorting member is arranged at a described valve tower layer and leading-out terminal.
Wherein, described first kind shorting member comprises short circuit copper film.
Wherein, described submodule comprises: rectifier, the first transistor, transistor seconds, the first diode, the second diode, resistance, electric capacity;
Wherein, the positive pole of rectifier is connected with the emitter of the first transistor, and the negative pole of rectifier is connected with the collector of the first transistor, the base earth of the first transistor; The negative pole of the first diode is connected with the collector of the first transistor, and positive pole is connected with the emitter of the first transistor; The emitter of the first transistor is connected with one end of resistance, and the collector of the first transistor is connected with transistor seconds emitter; Transistor seconds base earth; The negative pole of the second diode is connected with the collector of transistor seconds, and positive pole is connected with the emitter of transistor seconds; The emitter of transistor seconds is connected with first crystal pipe collector, and the collector of transistor seconds is connected with the other end of described resistance; The two ends of electric capacity are connected respectively at the two ends of resistance;
Wherein, outlet level and lambda line level are two lead-in wires being connected rectifier two ends, and a lead-in wire connects one end of rectifier.
Wherein, the outlet level of each described submodule and lambda line level arrange a short circuit point respectively, and an Equations of The Second Kind shorting member is arranged at the short circuit point of the short circuit point of the lambda line level of first submodule of a valve tower layer and the outlet level of last submodule.
Wherein, lead-in wire terminal and the leading-out terminal of each described valve tower layer arrange a short circuit point respectively, and an Equations of The Second Kind shorting member is arranged at the short circuit point of the lead-in wire terminal of a valve tower layer and the short circuit point of leading-out terminal.
Wherein, also comprise: series resonance withstand voltage test parts, wherein, described series resonance withstand voltage test parts comprise power supply, frequency conversion tank, and excitation becomes, controllable impedance, wherein,
Described frequency conversion tank one end is connected with described power supply, and the other end and described excitation in a disguised form connect; Described excitation becomes one end and is connected with described frequency conversion tank, and the other end is connected with described controllable impedance, and the change of described excitation is connected with ground wire; Described controllable impedance one end and described excitation in a disguised form connect, the other end is connected with the leading-out terminal of the valve tower of underproof brachium pontis, and wherein, the leading-out terminal of first valve tower is connected with the line segment that enters of second valve tower, be connected in series between described valve tower, the leading-out terminal of last valve tower is connected with controllable impedance.
The invention provides also a kind of converter valve bridge arm and form the method for equipotential body, comprising:
The outlet level of each submodule in valve tower each in underproof each brachium pontis is connected with lambda line level first kind shorting member;
The end of incoming cables of each valve tower layer is connected with leading-out terminal Equations of The Second Kind shorting member.
Wherein, described converter valve bridge arm also comprises after forming equipotential body: by regulating the size of controllable impedance, the series resonance frequency in the series resonance withstand voltage test loop at the brachium pontis place of carrying out in described converter valve testing is controlled within the scope of predetermined power frequency.
Wherein, the method that the series resonance frequency in described series resonance withstand voltage test loop controls within the scope of predetermined power frequency comprises:
Measure the overall ground capacitance carrying out the brachium pontis tested in converter valve;
Regulate the size of inductance in series resonance withstand voltage test loop;
Calculate the series resonance frequency of carrying out the series resonance withstand voltage test loop at the brachium pontis place of testing in converter valve;
When described series resonance frequency is within the scope of predetermined power frequency, then carry out series resonance withstand voltage test.
Based on technique scheme, the converter valve bridge arm that the embodiment of the present invention provides forms the device and method of equipotential body, comprising: brachium pontis, first kind shorting member, Equations of The Second Kind shorting member; Described brachium pontis comprises at least one valve tower, each valve tower comprises at least two valve tower layers, is connected in series in each valve tower between adjacent valve tower layer, and each valve tower layer comprises at least two submodules, between adjacent submodule, series connection is connected, and described submodule comprises outlet level and lambda line level; Wherein, a described first kind shorting member is arranged between the outlet level of a described submodule and lambda line level; Between the lead-in wire terminal that described Equations of The Second Kind shorting member is arranged at a described valve tower layer and leading-out terminal.Under converter valve in flexible DC power transmission engineering can being adopted modularization multi-level converter by said apparatus, converter valve bridge arm can be made to form equipotential body, to eliminate the interference of stray parameter.
Accompanying drawing explanation
In order to the technical scheme of the clearer explanation embodiment of the present invention or prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of half-bridge converter valve in modular multilevel converter type direct current transmission system in prior art;
The structural representation of the converter valve bridge arm that Fig. 2 provides for the embodiment of the present invention;
The device of the converter valve bridge arm formation equipotential body that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the submodule that Fig. 4 provides for the embodiment of the present invention;
The setting position schematic diagram of each short circuit point in the brachium pontis that Fig. 5 provides for the embodiment of the present invention;
The structural representation of the series resonance withstand voltage test that Fig. 6 provides for the embodiment of the present invention;
The block diagram of the method for the converter valve bridge arm formation equipotential body that Fig. 7 provides for the embodiment of the present invention;
Fig. 8 controls the method flow diagram within the scope of predetermined power frequency for the series resonance frequency in the series resonance withstand voltage test loop that the embodiment of the present invention provides.
Embodiment
Core of the present invention is to provide the device that a kind of converter valve bridge arm forms equipotential body, and this device under converter valve employing modularization multi-level converter, can make converter valve bridge arm form equipotential body in flexible DC power transmission engineering; Another object of the present invention is to provide a kind of method that converter valve bridge arm forms equipotential body.
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The present invention is to provide the device that a kind of converter valve bridge arm forms equipotential body, and this device under converter valve employing modularization multi-level converter, can make converter valve bridge arm form equipotential body in flexible DC power transmission engineering; Wherein, flexible DC power transmission two ends are current conversion station, and centre can adopt traditional overhead transmission line, also can use underground cable; Flexible DC power transmission can improve the quality of power supply of power supply; The low-order harmonic that in flexible DC power transmission, transverter produces is little, and modular design makes the design of flexible DC power transmission, production, installment and debugging cycle short.
With reference to Fig. 1, under in flexible DC power transmission engineering, converter valve adopts modularization multi-level converter, can see that wherein converter valve is made up of multiple brachium pontis (being generally 6 brachium pontis), each brachium pontis is connected by N number of valve tower, wherein by M, (voltage is higher again for each valve tower, M is more, as be 200kV, M being 90 when voltage) individual submodule SM forms;
Wherein, in the structure of above-mentioned converter valve, the part by testing converter valve is made to form equipotential body, namely can not be that whole converter valve entirety all forms equipotential body, but the part converter valve needing to carry out testing is formed equipotential body, by test portion in units of brachium pontis, namely can be a brachium pontis, also can be two brachium pontis, be exactly at most that whole converter valve entirety is tested, as long as can learn like this and a brachium pontis can be made to form an effective equipotential body, so just can solve and all be formed equipotential problem by each brachium pontis of test portion;
The structural representation of converter valve bridge arm can refer to Fig. 2 in the foregoing description, the structural representation of the converter valve bridge arm that Fig. 2 provides for the embodiment of the present invention; Can obtain allowing brachium pontis 301 form equipotential body in said structure, then must be necessary for equipotential by each valve tower 302, because be that series connection is connected between each valve tower 302 in each brachium pontis 301, as long as each valve tower 302 therefore in each brachium pontis 301 can form equipotential body, then each brachium pontis 301 just can form equipotential body;
In the present invention, the device of converter valve bridge arm formation equipotential body refers to Fig. 3, the device of the converter valve bridge arm formation equipotential body that Fig. 3 provides for the embodiment of the present invention; This device can composition graphs 2 and Fig. 3, and it comprises: brachium pontis 301, first kind shorting member 304, Equations of The Second Kind shorting member 303; Brachium pontis 301 comprises at least one valve tower 302, each valve tower 302 comprises at least two valve tower layers, is connected in series in each valve tower 302 between adjacent valve tower layer, and each valve tower layer comprises at least two submodules, between adjacent submodule, series connection is connected, and described submodule comprises outlet level 100 and lambda line level 200; Wherein, a described first kind shorting member 304 is arranged between the outlet level 100 of a described submodule and lambda line level 200; Between the lead-in wire terminal 300 that described Equations of The Second Kind shorting member 303 is arranged at a described valve tower layer and leading-out terminal 400.
Wherein, the lambda line level 200 of submodule and outlet level 100, and the lead-in wire terminal 300 of valve tower layer and leading-out terminal 400, be all the scope representing a length, the lead-in wire terminal 300 of such as valve tower layer refers to from a valve tower layer to the lead-in wire terminal 300 the lambda line level 200 of first submodule of this valve tower layer being all this valve tower layer; And owing to being that series connection is connected between individual valve tower layer, therefore the leading-out terminal 400 of a valve tower layer is a relative concept with the lead-in wire terminal 300 of adjacent series valve tower layer, its single line physically represented, on this line, each point effect is physically the same; The outlet level 100 of similar each adjacent series connection submodule is also the same reason with lambda line level 200; Therefore first kind shorting member 304 can be arranged and between the outlet level 100 (optional position) of a submodule and lambda line level 200 (optional position); An Equations of The Second Kind shorting member 303 is arranged between the lead-in wire terminal 300 (optional position) of a valve tower layer and leading-out terminal 400 (optional position).
Wherein, a described first kind shorting member 304 is arranged between the outlet level 100 of a described submodule and lambda line level 200, namely a sub-module generation equipotential body is made, all use first kind shorting member 304 to carry out short circuit all submodules in this valve tower 302, then in this valve tower 302, all submodules all form equipotential body; Between the lead-in wire terminal 300 that described Equations of The Second Kind shorting member 303 is arranged at a described valve tower layer and leading-out terminal 400, namely a valve tower layer is made to form equipotential body, all use Equations of The Second Kind shorting member 303 to carry out short circuit on valve tower layers all in this valve tower 302, then in this valve tower 302, all valve tower layers all form equipotential body; Again because each valve tower 302 is that series connection is connected in brachium pontis 301, because after in brachium pontis 301, each valve tower 302 all forms equipotential body, namely this brachium pontis 301 forms equipotential body.
Wherein, refer to Fig. 4, the structural representation of the submodule that Fig. 4 provides for the embodiment of the present invention; Described submodule can comprise: rectifier 407, the first transistor 401, transistor seconds 402, the first diode 403, second diode 404, resistance 405, electric capacity 406;
Wherein, the positive pole of rectifier 407 is connected with the emitter of the first transistor 401, and the negative pole of rectifier 407 is connected with the collector of the first transistor 401, the base earth of the first transistor 401; The negative pole of the first diode 403 is connected with the collector of the first transistor 401, and positive pole is connected with the emitter of the first transistor 401; The emitter of the first transistor 401 is connected with one end of resistance 405, and the collector of the first transistor 401 is connected with transistor seconds 402 emitter; Transistor seconds 402 base earth; The negative pole of the second diode 404 is connected with the collector of transistor seconds 402, and positive pole is connected with the emitter of transistor seconds 402; The emitter of transistor seconds 402 is connected with the first transistor 401 collector, and the collector of transistor seconds 402 is connected with the other end of described resistance 405; The two ends of electric capacity 406 are connected respectively at the two ends of resistance 405;
Wherein, outlet level 100 and lambda line level 200 are two lead-in wires being connected rectifier 407 two ends, and a lead-in wire connects one end of rectifier 407.
Optionally, described first kind shorting member comprises short circuit copper film; Here short circuit copper film is selected to be a preferred version, because the good conductivity of copper, stable performance, and quality is softer, uses short circuit copper film easily the outlet level 100 of submodule and lambda line level 200 can be carried out short circuit.
Optionally, described Equations of The Second Kind shorting member comprises shorting stub; Here selecting shorting stub to carry out short circuit is a preferred version, because use, shorting stub is convenient carries out short circuit between valve tower layer, and it arranges flexibly, can carry out as required.
Optionally, the outlet level 100 of each described submodule and lambda line level 200 arrange a short circuit point respectively, and an Equations of The Second Kind shorting member is arranged at the short circuit point of the short circuit point of the lambda line level 200 of first submodule of a valve tower layer and the outlet level 100 of last submodule; Here a first kind shorting member is arranged at the short circuit point of the outlet level 100 of a submodule and the short circuit point of lambda line level 200; An Equations of The Second Kind shorting member is arranged at the short circuit point of the short circuit point of the lambda line level 200 of first submodule of a valve tower layer and the outlet level 100 of last submodule; Here short circuit point sets in advance, does the time not only can saved required for short circuit like this, entirety also can be made to seem more neat, can reduce the setting of short circuit point.
Optionally, also the lead-in wire terminal 300 of each described valve tower layer and leading-out terminal 400 can be arranged a short circuit point respectively, an Equations of The Second Kind shorting member is arranged at the short circuit point of the lead-in wire terminal 300 of a valve tower layer and the short circuit point of outlet level 400.Preferably, short circuit point here can be arranged like this, the short circuit of leading-out terminal 400 point is arranged on the position of the lead-in wire terminal 300 near adjacent valve tower layer, the short circuit of lead-in wire terminal 300 point is arranged the position being the lead-in wire terminal 300 that leading-out terminal 400 is perpendicular; So not only save the time required for short circuit, a part of Equations of The Second Kind shorting member can also be saved to a certain extent.
Wherein, a short circuit point can be set respectively in the outlet level 100 of each described submodule and lambda line level 200, and a short circuit point is set respectively at the lead-in wire terminal 300 of each described valve tower layer and leading-out terminal 400; As shown in Figure 5, the setting position schematic diagram of each short circuit point in the brachium pontis that provides for the embodiment of the present invention of Fig. 5; Carry out the setting of short circuit point according to the position of the short circuit point in Fig. 5, not only can save the time required for short circuit, whole device also can be made to seem more neat, the use of a part of first kind and Equations of The Second Kind shorting member can also be saved to a certain extent.
Preferably, utilize said apparatus the brachium pontis in converter valve can be formed equipotential body, series resonance withstand voltage test can be carried out to converter valve or part brachium pontis wherein on this basis, therefore said apparatus also comprise series resonance withstand voltage test parts can see Fig. 6, the structural representation of the series resonance withstand voltage test that Fig. 6 provides for the embodiment of the present invention, wherein, described series resonance withstand voltage test parts can comprise power supply 601, frequency conversion tank 602, excitation becomes 603, controllable impedance 604, wherein
Frequency conversion tank 602 one end is connected with power supply 601, and the other end and excitation become 603 and be connected; Excitation becomes 603 one end and is connected with frequency conversion tank 602, and the other end is connected with controllable impedance 604, and excitation change 603 is connected with ground wire; Controllable impedance 604 one end and excitation become 603 and are connected, the other end is connected with the leading-out terminal of the valve tower of underproof brachium pontis, and wherein, the leading-out terminal of first valve tower is connected with the line segment that enters of second valve tower, be connected in series between described valve tower, the leading-out terminal of last valve tower is connected with controllable impedance 604.
Wherein, controllable impedance 604 passes through the size regulating inductance, to adapt to when carrying out series resonance and carrying out AC voltage withstand test by the change of the quantity of the brachium pontis in the converter valve of test portion; Owing to the change of ground capacitance can be caused large by the change of the quantity of the brachium pontis in the converter valve of test portion, and carry out the frequency that series resonance carries out AC voltage withstand test and will control in the scope of power frequency 45Hz ~ 65Hz, therefore, need to regulate the value of controllable impedance 604, the adjustment that such as can realize inductance by the different taps of controllable impedance (such as can arrange 50%, 100% etc. tap); Make frequency control in the scope of 45Hz ~ 65Hz, series resonance withstand voltage test can be carried out; And the brachium pontis of converter valve can be made optionally to carry out AC voltage withstand test, raise the efficiency.
Wherein, equipotential body will be formed by test portion brachium pontis before carrying out series resonance and carrying out AC voltage withstand test, equivalent test loop can be shortened, the test disturbing factor that Elimination test loop stray parameter causes.
Embodiments provide the device that converter valve bridge arm forms equipotential body, by said apparatus, converter valve bridge arm can be formed equipotential body; And carried out series resonance withstand voltage test to what form equipotential body by the brachium pontis of experimental section by the parts of series resonance withstand voltage test mentioned above on this basis.
The method that the converter valve bridge arm provided the embodiment of the present invention below forms equipotential body is introduced, converter valve bridge arm described below formed the method for equipotential body and above-described converter valve bridge arm form the device of equipotential body can mutual corresponding reference.
The block diagram of the method for the converter valve bridge arm formation equipotential body that Fig. 7 provides for the embodiment of the present invention; Form the device of equipotential body based on converter valve bridge arm described above, the method forming equipotential body with reference to Fig. 7 converter valve bridge arm can comprise:
Step s100, the outlet level of each submodule in valve tower each in underproof each brachium pontis to be connected with lambda line level first kind shorting member;
The all submodules in each brachium pontis are made to define equipotential body by step s100.
Step s110, the end of incoming cables of each valve tower layer to be connected with leading-out terminal Equations of The Second Kind shorting member.
Make each valve tower in each brachium pontis define equipotential body by step s110, be connected owing to connecting between each valve tower in each brachium pontis again, therefore whole brachium pontis can form equipotential body after above-mentioned two steps.
After converter valve bridge arm forms equipotential body, series resonance withstand voltage test can be carried out in whole or in part to converter valve, effectively can shorten test loop like this, decrease the series resonance test frequency instability that stray parameter causes, improve trial target quality factor, reduce experiment power supply demand, make the on-the-spot overall AC voltage withstand test simple possible of converter valve.The mode of carrying out AC voltage withstand test at present mainly contains: adopt pressure build-up test equipment directly to apply trial voltage and carry out AC voltage withstand test; Series resonance mode is adopted to carry out AC voltage withstand test;
Wherein, adopt pressure build-up test equipment directly to apply trial voltage and carry out the mode of AC voltage withstand test because testing equipment is too large at the scene, should not transport and implement, so generally do not adopt this mode at the AC voltage withstand test scene of voltage levels, and series resonance mode is adopted to carry out AC voltage withstand test.
Optionally, described converter valve bridge arm also comprises after forming equipotential body: by regulating the size of controllable impedance, the series resonance frequency in the series resonance withstand voltage test loop at the brachium pontis place of carrying out in described converter valve testing is controlled within the scope of predetermined power frequency.
At present, series resonance pressure test apparatus adopts mode of frequency regulation to carry out substantially, it adopts the resonance reactor parameter of series resonance withstand voltage test to be fixing, thus it is suitable for certain limit, and the frequency of series resonance withstand voltage test needs to control within the scope of power frequency 45Hz ~ 65Hz, series resonance withstand voltage test frequency computation part formula:
for MMC, if single brachium pontis ground capacitance is Co, 6 brachium pontis ground capacitances are 6*Co, ground capacitance changes greatly, and the reactance of on-the-spot series resonance pressure test apparatus series resonance is substantially all fixing, therefore can not meet frequency requirement, the change of the reactance Large Span Experimental scope of all brachium pontis from single brachium pontis to whole converter valve can not be realized simultaneously;
Therefore the size by regulating controllable impedance is adopted here, when making to increase or reduce test brachium pontis, by series resonance withstand voltage test frequency computation part formula:
the frequency obtained can control within the scope of predetermined power frequency, and such as, under MMC environment, predetermined power frequency scope is here 45Hz ~ 65Hz.
Optionally, as shown in Figure 8, the series resonance frequency in series resonance withstand voltage test loop that Fig. 8 provides for the embodiment of the present invention controls the method flow diagram within the scope of predetermined power frequency; The method comprises:
The overall ground capacitance of the brachium pontis tested is carried out in step s200, measurement converter valve;
The size of inductance in step s210, adjustment series resonance withstand voltage test loop;
The series resonance frequency in the series resonance withstand voltage test loop at the brachium pontis place of testing is carried out in step s220, calculating converter valve;
Step s230, when described series resonance frequency is within the scope of predetermined power frequency, then carry out series resonance withstand voltage test.
Pass through said method, utilize the series resonance withstand voltage test loop of band controllable impedance, by the change regulating controllable impedance to adapt to the on-the-spot overall ac voltage withstanding region of flexible direct current converter station converter valve, such as can carry out by a menu brachium pontis, also several brachium pontis can be selected to carry out simultaneously, or whole converter valve is tested, and series resonance frequency can be controlled within the scope of power frequency 45Hz ~ 65Hz.All brachium pontis in this way in converter valve all optionally carry out series resonance AC voltage withstand test, raise the efficiency.
Embodiments provide the method that converter valve bridge arm forms equipotential body, by said method, converter valve bridge arm can be formed equipotential body; And carried out series resonance withstand voltage test to what form equipotential body by the brachium pontis of experimental section by the parts of series resonance withstand voltage test mentioned above on this basis.
In instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
Professional can also recognize further, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above the apparatus and method that a kind of converter valve bridge arm provided by the present invention forms equipotential body are described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. converter valve bridge arm forms a device for equipotential body, and it is characterized in that, this device comprises: brachium pontis, first kind shorting member, Equations of The Second Kind shorting member;
Described brachium pontis comprises at least one valve tower, each valve tower comprises at least two valve tower layers, is connected in series in each valve tower between adjacent valve tower layer, and each valve tower layer comprises at least two submodules, between adjacent submodule, series connection is connected, and described submodule comprises outlet level and lambda line level;
Wherein, a described first kind shorting member is arranged between the outlet level of a described submodule and lambda line level;
Between the lead-in wire terminal that described Equations of The Second Kind shorting member is arranged at a described valve tower layer and leading-out terminal.
2. device as claimed in claim 1, it is characterized in that, described first kind shorting member comprises short circuit copper film.
3. device as claimed in claim 1, it is characterized in that, described submodule comprises: rectifier, the first transistor, transistor seconds, the first diode, the second diode, resistance, electric capacity;
Wherein, the positive pole of rectifier is connected with the emitter of the first transistor, and the negative pole of rectifier is connected with the collector of the first transistor, the base earth of the first transistor; The negative pole of the first diode is connected with the collector of the first transistor, and positive pole is connected with the emitter of the first transistor; The emitter of the first transistor is connected with one end of resistance, and the collector of the first transistor is connected with transistor seconds emitter; Transistor seconds base earth; The negative pole of the second diode is connected with the collector of transistor seconds, and positive pole is connected with the emitter of transistor seconds; The emitter of transistor seconds is connected with first crystal pipe collector, and the collector of transistor seconds is connected with the other end of described resistance; The two ends of electric capacity are connected respectively at the two ends of resistance;
Wherein, outlet level and lambda line level are two lead-in wires being connected rectifier two ends, and a lead-in wire connects one end of rectifier.
4. device as claimed in claim 1, it is characterized in that, the outlet level of each described submodule and lambda line level arrange a short circuit point respectively, and an Equations of The Second Kind shorting member is arranged at the short circuit point of the short circuit point of the lambda line level of first submodule of a valve tower layer and the outlet level of last submodule.
5. device as claimed in claim 1, it is characterized in that, lead-in wire terminal and the leading-out terminal of each described valve tower layer arrange a short circuit point respectively, and an Equations of The Second Kind shorting member is arranged at the short circuit point of the lead-in wire terminal of a valve tower layer and the short circuit point of leading-out terminal.
6. device as claimed in claim 1, it is characterized in that, described Equations of The Second Kind shorting member comprises shorting stub.
7. device as claimed in claim 1, it is characterized in that, also comprise: series resonance withstand voltage test parts, wherein, described series resonance withstand voltage test parts comprise power supply, frequency conversion tank, and excitation becomes, controllable impedance, wherein,
Described frequency conversion tank one end is connected with described power supply, and the other end and described excitation in a disguised form connect; Described excitation becomes one end and is connected with described frequency conversion tank, and the other end is connected with described controllable impedance, and the change of described excitation is connected with ground wire; Described controllable impedance one end and described excitation in a disguised form connect, the other end is connected with the leading-out terminal of the valve tower of underproof brachium pontis, and wherein, the leading-out terminal of first valve tower is connected with the lead-in wire terminal of second valve tower, be connected in series between described valve tower, the leading-out terminal of last valve tower is connected with controllable impedance.
8. converter valve bridge arm forms a method for equipotential body, it is characterized in that, form the device of equipotential body based on the converter valve bridge arm described in any one of claim 1 to 7, the method comprises:
The outlet level of each submodule in valve tower each in underproof each brachium pontis is connected with lambda line level first kind shorting member;
The end of incoming cables of each valve tower layer is connected with leading-out terminal Equations of The Second Kind shorting member.
9. method as claimed in claim 8, it is characterized in that, described converter valve bridge arm also comprises after forming equipotential body: by regulating the size of controllable impedance, the series resonance frequency in the series resonance withstand voltage test loop at the brachium pontis place of carrying out in described converter valve testing is controlled within the scope of predetermined power frequency.
10. method as claimed in claim 9, it is characterized in that, the method that the series resonance frequency in described series resonance withstand voltage test loop controls within the scope of predetermined power frequency comprises:
Measure the overall ground capacitance carrying out the brachium pontis tested in converter valve;
Regulate the size of inductance in series resonance withstand voltage test loop;
Calculate the series resonance frequency of carrying out the series resonance withstand voltage test loop at the brachium pontis place of testing in converter valve;
When described series resonance frequency is within the scope of predetermined power frequency, then carry out series resonance withstand voltage test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410503608.6A CN104237754B (en) | 2014-09-26 | 2014-09-26 | A kind of converter valve bridge arm forms the method and device of equipotential body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410503608.6A CN104237754B (en) | 2014-09-26 | 2014-09-26 | A kind of converter valve bridge arm forms the method and device of equipotential body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104237754A true CN104237754A (en) | 2014-12-24 |
| CN104237754B CN104237754B (en) | 2017-03-15 |
Family
ID=52226224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410503608.6A Active CN104237754B (en) | 2014-09-26 | 2014-09-26 | A kind of converter valve bridge arm forms the method and device of equipotential body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104237754B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532072A (en) * | 2020-03-26 | 2021-03-19 | 南京南瑞继保电气有限公司 | Modular multi-level submodule, valve tower and alternating current withstand voltage test method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429831B (en) * | 2019-08-16 | 2021-07-23 | 南京南瑞继保工程技术有限公司 | Converter valve |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200972429Y (en) * | 2006-06-13 | 2007-11-07 | 王钰 | Series resonance power frequency pressure test device |
| DE102006046040A1 (en) * | 2006-09-28 | 2008-04-03 | Siemens Ag | Thyristor valve of a HVDC system |
| CN201335872Y (en) * | 2009-01-21 | 2009-10-28 | 中国第一冶金建设有限责任公司 | Power-frequency inductance-change resonance voltage-withstanding testing device |
| CN102004212A (en) * | 2010-10-15 | 2011-04-06 | 中国电力科学研究院 | Equivalent load device of direct current converter valve multiple valve tests |
| CN102097402A (en) * | 2010-11-17 | 2011-06-15 | 中国电力科学研究院 | DC (Direct Current) device for equalizing pressure of converter valve waterway |
| CN201955431U (en) * | 2010-12-01 | 2011-08-31 | 中国电力科学研究院 | Multiple-valve surge voltage tester for direct-current converter valve |
| CN102780416A (en) * | 2012-08-15 | 2012-11-14 | 株洲变流技术国家工程研究中心有限公司 | Modularization-based multi-level converter flexible direct current transmission device and system thereof |
| WO2013143037A1 (en) * | 2012-03-31 | 2013-10-03 | 华北电力大学 | Topological method of modular multilevel converter structure based on loop nesting mechanism |
| CN103558536A (en) * | 2013-11-01 | 2014-02-05 | 国家电网公司 | Circuit for testing overload tolerance capacity of series capacitor and working method of circuit |
| CN103579147A (en) * | 2013-11-06 | 2014-02-12 | 国家电网公司 | Equipotential electrode for converter valve |
| CN204065337U (en) * | 2014-09-26 | 2014-12-31 | 国家电网公司 | A kind of converter valve bridge arm forms the device of equipotential body |
-
2014
- 2014-09-26 CN CN201410503608.6A patent/CN104237754B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200972429Y (en) * | 2006-06-13 | 2007-11-07 | 王钰 | Series resonance power frequency pressure test device |
| DE102006046040A1 (en) * | 2006-09-28 | 2008-04-03 | Siemens Ag | Thyristor valve of a HVDC system |
| CN201335872Y (en) * | 2009-01-21 | 2009-10-28 | 中国第一冶金建设有限责任公司 | Power-frequency inductance-change resonance voltage-withstanding testing device |
| CN102004212A (en) * | 2010-10-15 | 2011-04-06 | 中国电力科学研究院 | Equivalent load device of direct current converter valve multiple valve tests |
| CN102097402A (en) * | 2010-11-17 | 2011-06-15 | 中国电力科学研究院 | DC (Direct Current) device for equalizing pressure of converter valve waterway |
| CN201955431U (en) * | 2010-12-01 | 2011-08-31 | 中国电力科学研究院 | Multiple-valve surge voltage tester for direct-current converter valve |
| WO2013143037A1 (en) * | 2012-03-31 | 2013-10-03 | 华北电力大学 | Topological method of modular multilevel converter structure based on loop nesting mechanism |
| CN102780416A (en) * | 2012-08-15 | 2012-11-14 | 株洲变流技术国家工程研究中心有限公司 | Modularization-based multi-level converter flexible direct current transmission device and system thereof |
| CN103558536A (en) * | 2013-11-01 | 2014-02-05 | 国家电网公司 | Circuit for testing overload tolerance capacity of series capacitor and working method of circuit |
| CN103579147A (en) * | 2013-11-06 | 2014-02-12 | 国家电网公司 | Equipotential electrode for converter valve |
| CN204065337U (en) * | 2014-09-26 | 2014-12-31 | 国家电网公司 | A kind of converter valve bridge arm forms the device of equipotential body |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532072A (en) * | 2020-03-26 | 2021-03-19 | 南京南瑞继保电气有限公司 | Modular multi-level submodule, valve tower and alternating current withstand voltage test method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104237754B (en) | 2017-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ghassemi | Accelerated insulation aging due to fast, repetitive voltages: A review identifying challenges and future research needs | |
| Abu-Hashim et al. | Test systems for harmonics modeling and simulation | |
| CN206099366U (en) | Ambipolar photovoltaic power generation system | |
| CN105183947B (en) | High frequency transformer transmission characteristic optimization method based on parasitic parameter effect analysis | |
| CN102474101A (en) | Device for inverting an electric parameter, having a star point reactor | |
| Kersting | A comprehensive distribution test feeder | |
| BR102014016186B1 (en) | Method and arrangement for transferring electrical power at sea | |
| CN103954866A (en) | Testing circuit of half-bridge-structure voltage source current converter and modulation method thereof | |
| CN113219369B (en) | Test method for testing cross-connection performance of cables in laying site | |
| Obulesu et al. | A% THD analysis of industrial power distribution systems with active power filter-case studies | |
| Mueller et al. | Impact of large-scale integration of E-mobility and photovoltaics on power quality in low voltage networks | |
| CN104237754A (en) | Method and device for bridge arm to form equipotential body in converter valve | |
| CN101882498A (en) | Reactor | |
| CN204065337U (en) | A kind of converter valve bridge arm forms the device of equipotential body | |
| BR102014016345B1 (en) | Method and arrangement for transferring electrical power | |
| CN203729647U (en) | Cable terminal tower device | |
| CN105024578A (en) | Three-phase modular multilevel converter parallel system and control method thereof | |
| CN201820571U (en) | Reactor | |
| CN102624102A (en) | Power supplying circuit and power supplying method for chain-type SVG (static var generator) modules | |
| Khalilnezhad et al. | Influence of long EHV AC underground cables on the resonance behavior of the Dutch transmission system | |
| Shen et al. | Modeling of high-frequency electromagnetic oscillation for DC fault in MMC-HVDC systems | |
| CN106528944A (en) | Analysis method for obtaining maximum transient overvoltage of single feeder line of offshore wind power plant under asymmetric short circuit fault | |
| CN113484605B (en) | Charger super-high harmonic emission evaluation method and device and storage medium | |
| CN106531424B (en) | Water-cooled air reactor, power conversion device and wind generating set | |
| CN204116537U (en) | A kind of device determining DC voltage withstand test start-up time |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |