CN104237754B - A kind of converter valve bridge arm forms the method and device of equipotential body - Google Patents
A kind of converter valve bridge arm forms the method and device of equipotential body Download PDFInfo
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- CN104237754B CN104237754B CN201410503608.6A CN201410503608A CN104237754B CN 104237754 B CN104237754 B CN 104237754B CN 201410503608 A CN201410503608 A CN 201410503608A CN 104237754 B CN104237754 B CN 104237754B
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Abstract
The invention discloses a kind of converter valve bridge arm forms the device of equipotential body, including：Bridge arm, first kind shorting member, Equations of The Second Kind shorting member；The bridge arm includes that at least one valve tower, each valve tower include at least two valve tower layers, be connected in series in each valve tower between adjacent valve tower layer that each valve tower layer includes at least two submodules, is connected in series between adjacent submodule, and the submodule includes outlet level and enters line level；Wherein, a first kind shorting member is arranged at the outlet level of a submodule and enters between line level；One Equations of The Second Kind shorting member is arranged between the lead-in wire terminal and leading-out terminal of a valve tower layer.
Description
Technical field
The present invention relates to electric field, more particularly to a kind of method of converter valve bridge arm formation equipotential body and dress
Put.
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,
The control of desired DC voltage and realization to power is obtained by three-phase alternating voltage is connected to DC terminal successively；MMC is
A kind of new voltage conversion circuit, it can be superimposed the very high voltage of output by way of multiple submodule is cascaded, and
And also there is the features such as output harmonic wave is few, the degree of modularity is high, thus be with a wide range of applications in power system.The change of current
Valve is made up of multiple bridge arms (generally 6 bridge arms), and each bridge arm is connected by N number of valve tower, and wherein each valve tower is again by M (voltages
Higher, M is more, and such as when voltage is 200kV, M is that 90) individual submodule is constituted, and the single submodule of wherein sub-module cascade has entirely
Two kinds of structures of bridge and half-bridge；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 is typically tied using half-bridge
Structure.Fig. 1 shows the structure of half-bridge converter valve, and with reference to Fig. 1, on each, bridge arm or lower bridge arm are made up of n SM cascade, up and down
Connect between bridge arm an inductance L0 respectively.
Above-mentioned converter valve can operationally be superimposed the very high voltage of output, in order to the safety of equipment and personnel will be exchanged
The voltage endurance capability of stream valve is tested, and wherein pressure test is inspection electrical equipment, electrical equipment, electric device, electric wiring and electricity
Work safety appliance etc. bears one of main method of overvoltage ability；Pressure test can effectively find converter valve humidified insulation,
The general defect such as dirty, or local devices free property defect and insulation ag(e)ing have critically important practical significance, in order to prevent reality
Converter valve is caused to damage during testing, it is necessary to before the test so that the bridge arm of tested change of current valve portion forms equipotential body,
Voltage official post its insulating properties will not be produced to be destroyed so in pressure test；Therefore how underproof change of current valve portion is made
Bridge arm formed equipotential body for pressure test most important.
Therefore, how in flexible DC power transmission engineering, converter valve, using under modularization multi-level converter, makes converter valve
Bridge arm forms equipotential body, is those skilled in the art's technical issues that need to address.
Content of the invention
It is an object of the invention to provide a kind of converter valve bridge arm forms the device of equipotential body, the device is in flexible direct current
In power transmission engineering, converter valve is adopted under modularization multi-level converter, and converter valve bridge arm can be made to form equipotential body；This
Bright another object is to provide a kind of method that converter valve bridge arm forms equipotential body.
For solving above-mentioned technical problem, the present invention provides the device that a kind of converter valve bridge arm forms equipotential body, the dress
Put including：Bridge arm, first kind shorting member, Equations of The Second Kind shorting member；
The bridge arm includes that at least one valve tower, each valve tower include at least two valve tower layers, adjacent valve tower layer in each valve tower
Between be connected in series, each valve tower layer includes at least two submodules, is connected in series between adjacent submodule, and the submodule includes
Outlet level and enter line level；
Wherein, a first kind shorting member is arranged at the outlet level of a submodule and enters between line level；
One Equations of The Second Kind shorting member is arranged between the lead-in wire terminal and leading-out terminal of a valve tower layer.
Wherein, the first kind shorting member includes short circuit copper film.
Wherein, the submodule includes：Rectifier, the first transistor, transistor seconds, the first diode, the two or two pole
Pipe, resistance, electric capacity；
Wherein, the positive pole of rectifier is connected with the emitter stage of the first transistor, the negative pole of rectifier and the first transistor
Colelctor electrode is connected, the base earth of the first transistor；The negative pole of the first diode is connected with the colelctor electrode of the first transistor, positive pole
It is connected with the emitter stage of the first transistor；The emitter stage of the first transistor is connected with one end of resistance, the current collection of the first transistor
Pole is connected with transistor seconds emitter stage；Transistor seconds base earth；The negative pole of the second diode and the collection of transistor seconds
Electrode is connected, and positive pole is connected with the emitter stage of transistor seconds；The emitter stage of transistor seconds and first crystal pipe collector phase
Even, the colelctor electrode of transistor seconds is connected with the other end of the resistance；The two ends of electric capacity are connected respectively at the two ends of resistance；
Wherein, outlet level connects the one of rectifier with two leads that line level is connection rectifier two ends, a lead is entered
End.
Wherein, the outlet level of each submodule and enter line level and be respectively provided with a short circuit point, an Equations of The Second Kind short circuit
Part is arranged at the short circuit point for entering line level of first submodule of a valve tower layer and the outlet level of last submodule
Short circuit point.
Wherein, the lead-in wire terminal and leading-out terminal of each valve tower layer is respectively provided with a short circuit point, an Equations of The Second Kind short circuit portion
Part is arranged at the short circuit point of the short circuit point and leading-out terminal of the lead-in wire terminal of a valve tower layer.
Wherein, also include：Series resonance pressure test part, wherein, the series resonance pressure test part includes electricity
Source, frequency conversion tank, excitation-transformation variable, controllable impedance, wherein,
Described frequency conversion tank one end is connected with the power supply, and the other end is connected with the excitation-transformation variable；Described excitation-transformation variable one end with
The frequency conversion tank is connected, and the other end is connected with the controllable impedance, and the excitation-transformation variable is connected with ground wire；The controllable impedance one
End is connected with the excitation-transformation variable, and the other end is connected with the leading-out terminal of the valve tower of underproof bridge arm, and wherein, first valve tower goes out
Line end is connected with the line segment that enters of second valve tower, is connected in series between the valve tower, the leading-out terminal of last valve tower with adjustable
Inductance is connected.
The present invention provides the method that also a kind of converter valve bridge arm forms equipotential body, including：
By the outlet level of each submodule in each valve tower in each bridge arm underproof and to enter the line level first kind short
Relay part connects；
The end of incoming cables of each valve tower layer and leading-out terminal are connected with Equations of The Second Kind shorting member.
Wherein, the converter valve bridge arm also includes after forming equipotential body：By adjusting the size of controllable impedance so that
The series resonance frequency control in the series resonance pressure test loop that the bridge arm that is tested in the converter valve is located is predetermined
In the range of power frequency.
Wherein, method of the series resonance frequency control in the series resonance pressure test loop in the range of predetermined power frequency
Including：
The overall ground capacitance of the bridge arm that is tested in measurement converter valve；
Adjust the size of inductance in series resonance pressure test loop；
Calculate the series resonance frequency in the series resonance pressure test loop that the bridge arm that is tested in converter valve is located；
When the series resonance frequency carries out series resonance pressure test in the range of predetermined power frequency, then.
Be based on above-mentioned technical proposal, converter valve bridge arm that the embodiment of the present invention is provided formed the device of equipotential body and
Method, including：Bridge arm, first kind shorting member, Equations of The Second Kind shorting member；The bridge arm includes at least one valve tower, each valve tower
Including at least two valve tower layers, it is connected in series between adjacent valve tower layer in each valve tower, each valve tower layer includes at least two submodules,
It is connected in series between adjacent submodule, the submodule includes outlet level and enters line level；Wherein, a first kind short circuit portion
Part is arranged at the outlet level of a submodule and enters between line level；One Equations of The Second Kind shorting member is arranged at an institute
State between the lead-in wire terminal and leading-out terminal of valve tower layer.Converter valve in flexible DC power transmission engineering can be adopted mould by said apparatus
Under block multilevel converter, converter valve bridge arm can be made to form equipotential body, to eliminate the interference of stray parameter.
Description of the drawings
For the clearer explanation embodiment of the present invention or the technical scheme of prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are 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
Figure；
Fig. 2 is the structural representation of converter valve bridge arm provided in an embodiment of the present invention；
Fig. 3 is the device that converter valve bridge arm provided in an embodiment of the present invention forms equipotential body；
Fig. 4 is the structural representation of submodule provided in an embodiment of the present invention；
Fig. 5 is the set location schematic diagram of each short circuit point in bridge arm provided in an embodiment of the present invention；
Fig. 6 is the structural representation of series resonance pressure test provided in an embodiment of the present invention；
Fig. 7 is the block diagram of the method that converter valve bridge arm provided in an embodiment of the present invention forms equipotential body；
Fig. 8 is that the series resonance frequency in series resonance pressure test loop provided in an embodiment of the present invention is controlled in predetermined work
Method flow diagram in the range of frequency.
Specific embodiment
The core of the present invention is to provide the device that a kind of converter valve bridge arm forms equipotential body, and the device is in flexible direct current
In power transmission engineering, converter valve is adopted under modularization multi-level converter, and converter valve bridge arm can be made to form equipotential body；This
Bright another object is to provide a kind of method that converter valve bridge arm forms equipotential body.
Purpose, technical scheme and advantage for making the embodiment of the present invention is clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, to the embodiment of the present invention in technical scheme be clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention, rather than whole embodiments.Embodiment in based on the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs 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 the device is in flexible DC power transmission work
In journey, converter valve is adopted under modularization multi-level converter, and converter valve bridge arm can be made to form equipotential body；Wherein, flexible straight
Stream transmits electricity two ends for current conversion station, and centre can adopt traditional overhead transmission line, it is also possible to using buried cable；Flexible DC power transmission
The quality of power supply of power supply can be improved；The low-order harmonic that transverter is produced in flexible DC power transmission is little, and modular design
So that the design of flexible DC power transmission, production, installation and debugging cycle are short.
With reference to Fig. 1, in flexible DC power transmission engineering, converter valve is using under modularization multi-level converter, it can be seen that its
Middle converter valve is made up of multiple bridge arms (generally 6 bridge arms), and each bridge arm is connected by N number of valve tower, and wherein each valve tower is again by M
(voltage is higher, and M is more, and such as when voltage is 200kV, M is that 90) individual submodule SM is constituted；
Wherein, in the structure of above-mentioned converter valve, the part for being tested converter valve is made to form equipotential body, you can not to be
Whole converter valve integrally all forms equipotential body, but the part converter valve for needing to be tested is formed equipotential body, quilt
Test portion is in units of bridge arm, you can be a bridge arm, or two bridge arms, be at most exactly whole converter valve entirety
Tested, a bridge arm can be made to form an effective equipotential body as long as can so learn, then can just solve
Equipotential problem is all formed by each bridge arm of test portion；
The structural representation of converter valve bridge arm can refer to Fig. 2 in the foregoing description, and Fig. 2 is provided in an embodiment of the present invention
The structural representation of converter valve bridge arm；Bridge arm to be allowed 301 can be obtained in said structure and forms equipotential body, then have to
Each valve tower 302 is necessary for equipotential, is because being connected in series between each valve tower 302 in each bridge arm 301, therefore
As long as each valve tower 302 in each bridge arm 301 can form equipotential body, then each bridge arm 301 can just form equipotential
Body；
In the present invention, the device of converter valve bridge arm formation equipotential body refers to Fig. 3, and Fig. 3 is provided for the embodiment of the present invention
Converter valve bridge arm formed equipotential body device；The device can be in conjunction with Fig. 2 and Fig. 3, and which includes：Bridge arm 301, the first kind
Shorting member 304, Equations of The Second Kind shorting member 303；Bridge arm 301 includes that at least one valve tower 302, each valve tower 302 include at least two
Individual valve tower layer, is connected in series between adjacent valve tower layer in each valve tower 302, and each valve tower layer includes at least two submodules, adjacent son
It is connected in series between module, the submodule includes outlet level 100 and enters line level 200；Wherein, a first kind short circuit portion
Part 304 is arranged at the outlet level 100 of a submodule and enters between line level 200；One Equations of The Second Kind shorting member 303
It is arranged between the lead-in wire terminal 300 and leading-out terminal 400 of a valve tower layer.
Wherein, submodule enters line level 200 and outlet level 100, and the lead-in wire terminal 300 and leading-out terminal 400 of valve tower layer, all
It is the scope for representing a length, the lead-in wire terminal 300 of such as valve tower layer refers to starting to the valve tower layer from a valve tower layer
Entering between line level 200 for first submodule is all the lead-in wire terminal 300 of the valve tower layer；And due to being series connection between individual valve tower layer
Connected, 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
The single line for physically representing, on the line, each point effect physically is the same；Similar each adjacent series connection submodule
Outlet level 100 with enter line level 200 be also as reason；Therefore a first kind shorting member 304 can be arranged and a son
The outlet level 100 (optional position) of module and enter between line level 200 (optional position)；One Equations of The Second Kind shorting member 303 is arranged
Between the lead-in wire terminal 300 (optional position) and leading-out terminal 400 (optional position) of a valve tower layer.
Wherein, a first kind shorting member 304 is arranged at the outlet level 100 of a submodule and enters line level
Between 200, i.e., so that a submodule forms equipotential body, all submodules in the valve tower 302 are all used first kind short circuit portion
Part 304 carries out short circuit, then in the valve tower 302, all submodules all form equipotential body；One Equations of The Second Kind shorting member 303
Be arranged between the lead-in wire terminal 300 and leading-out terminal 400 of a valve tower layer, i.e., so that a valve tower layer forms equipotential body,
All valve tower layers in the valve tower 302 are all carried out short circuit with Equations of The Second Kind shorting member 303, then all valve tower layers in the valve tower 302
Equipotential body is all formed；Again because each valve tower 302 is to be connected in series in bridge arm 301, because each valve tower in bridge arm 301
After 302 all form equipotential body, the bridge arm 301 forms equipotential body.
Wherein, Fig. 4 is referred to, and Fig. 4 is the structural representation of submodule provided in an embodiment of the present invention；The submodule can
To include：Rectifier 407, the first transistor 401, transistor seconds 402, the first diode 403, the second diode 404, resistance
405, electric capacity 406；
Wherein, the positive pole of rectifier 407 is connected with the emitter stage of the first transistor 401, the negative pole of rectifier 407 and first
The colelctor electrode of transistor 401 is connected, the base earth of the first transistor 401；The negative pole and the first transistor of the first diode 403
401 colelctor electrode is connected, and positive pole is connected with the emitter stage of the first transistor 401；The emitter stage and resistance of the first transistor 401
405 one end is connected, and the colelctor electrode of the first transistor 401 is connected with 402 emitter stage of transistor seconds；402 base of transistor seconds
Pole is grounded；The negative pole of the second diode 404 is connected with the colelctor electrode of transistor seconds 402, and positive pole is sent out with transistor seconds 402
Emitter-base bandgap grading is connected；The emitter stage of transistor seconds 402 is connected with 401 colelctor electrode of the first transistor, the colelctor electrode of transistor seconds 402
It is connected with the other end of the resistance 405；The two ends of electric capacity 406 are connected respectively at the two ends of resistance 405；
Wherein, outlet level 100 and two bar leads of the line level 200 for 407 two ends of connection rectifier are entered, a lead connection is whole
One end of stream device 407.
Optionally, the first kind shorting member includes short circuit copper film；Here it is a preferred version from short circuit copper film,
Because the good conductivity of copper, stable performance, and quality is softer, can easily by the outlet level of submodule using short circuit copper film
100 and enter line level 200 and carry out short circuit.
Optionally, the Equations of The Second Kind shorting member includes shorting stub；Here from shorting stub carry out short circuit be one preferably
Scheme, because convenient for short circuit is carried out between valve tower layer using shorting stub, which is arranged flexibly, can carry out as needed.
Optionally, the outlet level 100 of each submodule and enter line level 200 and be respectively provided with a short circuit point, one the
Two class shorting members are arranged at the short circuit point for entering line level 200 and last submodule of first submodule of a valve tower layer
Outlet level 100 short circuit point；One first kind shorting member is arranged at the short circuit of the outlet level 100 of a submodule here
Put and enter the short circuit point of line level 200；What one Equations of The Second Kind shorting member was arranged at first submodule of a valve tower layer enters line
The short circuit point of the outlet level 100 of the short circuit point and last submodule of level 200；Here short circuit point is set in advance,
The time that do so not only can be saved required for short circuit, it is also possible to make entirety seem more neat, it is possible to reduce short circuit point
Setting.
Optionally, it is also possible to which the lead-in wire terminal 300 and leading-out terminal 400 of each valve tower layer are respectively provided with a short circuit point,
One Equations of The Second Kind shorting member is arranged at the short circuit point and the short circuit point of outlet level 400 of the lead-in wire terminal 300 of a valve tower layer.It is preferred that
, short circuit point here can be arranged such that, the lead-in wire terminal that the short circuit point of leading-out terminal 400 is positioned close to adjacent valve tower layer
The short circuit point of lead-in wire terminal 300 is provided in the position of the perpendicular lead-in wire terminal 300 of leading-out terminal 400 by 300 position；So not
The time that only saves required for short circuit, a part of Equations of The Second Kind shorting member can also be saved to a certain extent.
Wherein it is possible to each submodule outlet level 100 and enter line level 200 and be respectively provided with a short circuit point, and
A short circuit point is respectively provided with the lead-in wire terminal 300 and leading-out terminal 400 of each valve tower layer；As shown in figure 5, Fig. 5 is the present invention
The set location schematic diagram of each short circuit point in the bridge arm that embodiment is provided；The position of the short circuit point according to Fig. 5 carries out short circuit point
Setting, the time that not only can be saved required for short circuit, it is also possible to make whole device seem more neat, can be with one
Determine the use that a part of first kind and Equations of The Second Kind shorting member is saved in degree.
Preferably, the bridge arm in converter valve can be formed equipotential body using said apparatus, on this basis can be right
Converter valve or part bridge arm therein carry out series resonance pressure test, and therefore said apparatus also include the pressure examination of series resonance
Test part and can be found in Fig. 6, Fig. 6 is the structural representation of series resonance pressure test provided in an embodiment of the present invention, wherein, described
Series resonance pressure test part can include power supply 601, frequency conversion tank 602, excitation-transformation variable 603, controllable impedance 604, wherein,
602 one end of frequency conversion tank is connected with power supply 601, and the other end is connected with excitation-transformation variable 603；603 one end of excitation-transformation variable and frequency conversion
Cabinet 602 is connected, and the other end is connected with controllable impedance 604, and excitation-transformation variable 603 is connected with ground wire；604 one end of controllable impedance and excitation
Become 603 to be connected, the other end is connected with the leading-out terminal of the valve tower of underproof bridge arm, wherein, the leading-out terminal of first valve tower and the
The line segment that enters of two valve towers is connected, and is connected in series, the leading-out terminal of last valve tower and 604 phase of controllable impedance between the valve tower
Even.
Wherein, controllable impedance 604 is by adjusting the size of inductance, to adapt to carry out ac voltage withstanding examination carrying out series resonance
By the change of the quantity of the bridge arm in the converter valve of test portion when testing；Bridge arm in due to the converter valve by test portion
The change of quantity the change of direct-to-ground capacitance can be caused big, and carry out series resonance and carry out the frequency of ac voltage withstanding test controlling
In the range of power frequency 45Hz～65Hz, accordingly, it would be desirable to adjust the value of controllable impedance 604, for example, can pass through controllable impedance not
Same tap (can for example arrange the tap such as 50%, 100%) is realizing the regulation to inductance；So that FREQUENCY CONTROL 45Hz～
In the range of 65Hz, series resonance pressure test can be carried out；And the bridge arm of converter valve can be made optionally to be handed over
Stream pressure test, improves efficiency.
Wherein, equipotential body will be formed by test portion bridge arm before carrying out series resonance and carrying out ac voltage withstanding test, can
To shorten equivalent test loop, the test disturbing factor that test loop stray parameter causes is eliminated.
The device that converter valve bridge arm forms equipotential body is embodiments provided, be able to will be changed by said apparatus
Stream valve bridge arm forms equipotential body；And on this basis can be by the part pair of series resonance pressure test mentioned above
The bridge arm by experimental section for having formed equipotential body carries out series resonance pressure test.
Below the method that converter valve bridge arm provided in an embodiment of the present invention forms equipotential body is introduced, is hereafter retouched
The converter valve bridge arm that states forms the device that the method for equipotential body and above-described converter valve bridge arm form equipotential body
Can be mutually to should refer to.
Fig. 7 is the block diagram of the method that converter valve bridge arm provided in an embodiment of the present invention forms equipotential body；Based on above-mentioned
Described converter valve bridge arm forms the device of equipotential body, and the method for forming equipotential body with reference to Fig. 7 converter valves bridge arm can
To include：
Step s100, by the outlet level of each submodule in each valve tower in each bridge arm underproof and enter line level use
First kind shorting member connects；
The all submodules in each bridge arm are caused to define equipotential body by step s100.
Step s110, the end of incoming cables of each valve tower layer and leading-out terminal are connected with Equations of The Second Kind shorting member.
Cause each the valve tower in each bridge arm to define equipotential body by step s110, but due to each bridge arm in
It is connected in series between each valve tower, therefore whole bridge arm can form equipotential body after above-mentioned two step.
After converter valve bridge arm forms equipotential body, the pressure examination of series resonance can be carried out in whole or in part to converter valve
Test, can so effectively shorten test loop, reduce the series resonance test frequency instability that stray parameter causes, carry
High test quality factor, reduces to experiment power supply demand, makes converter valve scene entirety ac voltage withstanding test simple possible.Mesh
Before carry out the mode of ac voltage withstanding test and mainly have：Directly applying test voltage using pressure build-up test equipment carries out ac voltage withstanding examination
Test；Ac voltage withstanding test is carried out using series resonance mode；
Wherein, directly applying test voltage using pressure build-up test equipment is carried out by the way of ac voltage withstanding test due at the scene
Testing equipment is too big, should not transport and implement, so typically not adopting this side in the ac voltage withstanding testing ground of voltage levels
Formula, and ac voltage withstanding test is carried out using series resonance mode.
Optionally, the converter valve bridge arm also includes after forming equipotential body：By adjusting the size of controllable impedance, make
The series resonance frequency for obtaining the series resonance pressure test loop that the bridge arm that is tested in the converter valve is located is controlled pre-
Determine in the range of power frequency.
At present, series resonance pressure test apparatus are carried out using mode of frequency regulation substantially, and which adopts series resonance pressure test
Resonance reactor parameter be fixed, thus its be suitable for be have a range of, and the frequency of series resonance pressure test need
Control in the range of power frequency 45Hz～65Hz, series resonance pressure test frequency computing formula：For
MMC, if single bridge arm ground capacitance is Co, 6 bridge arm ground capacitances are 6*Co, and ground capacitance is changed greatly, and
Live series resonance pressure test apparatus series resonance reactance is substantially fixed, therefore can not meet frequency requirement, while
The change from single bridge arm reactance Large Span Experimental scope of all bridge arms in whole converter valve can not be realized；
Therefore here using the size by adjusting controllable impedance so that in the case of increasing or reducing test bridge arm,
By series resonance pressure test frequency computing formula：The frequency for obtaining can be controlled in predetermined power frequency model
In enclosing, such as under MMC environment, predetermined power frequency scope here is 45Hz～65Hz.
Optionally, as shown in figure 8, Fig. 8 be series resonance pressure test loop provided in an embodiment of the present invention series connection humorous
Method flow diagram of the vibration frequency control in the range of predetermined power frequency；The method includes：
The overall ground capacitance of the bridge arm that is tested in step s200, measurement converter valve；
Step s210, the size for adjusting inductance in series resonance pressure test loop；
The series connection in the series resonance pressure test loop that the bridge arm that is tested in step s220, calculating converter valve is located is humorous
Vibration frequency；
Step s230, series resonance pressure test is carried out in the range of predetermined power frequency, then when the series resonance frequency.
By said method, using the series resonance pressure test loop with controllable impedance, by adjust controllable impedance come
Adapt to the change in flexible direct current converter station converter valve scene entirety ac voltage withstanding region, for example, can be carried out with menu bridge arm,
Several bridge arms can be selected while carrying out, or whole converter valve is tested, and series resonance frequency can be controlled in work
In the range of frequency 45Hz～65Hz.All bridge arms in converter valve all optionally carry out series resonance exchange in this way
Pressure test, improves efficiency.
The method that converter valve bridge arm forms equipotential body is embodiments provided, be able to will be changed by said method
Stream valve bridge arm forms equipotential body；And on this basis can be by the part pair of series resonance pressure test mentioned above
The bridge arm by experimental section for having formed equipotential body carries out series resonance pressure test.
In specification, each embodiment is described by the way of going forward one by one, and what each embodiment was stressed is and other realities
Apply the difference of example, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
Speech, as which corresponds to the method disclosed in Example, so description is fairly simple, related part is referring to method part illustration
?.
Professional further appreciates that, in conjunction with the unit of each example of the embodiments described herein description
And algorithm steps, can with electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate hardware and
The interchangeability of software, generally describes composition and the step of each example in the above description according to function.These
Function is executed with hardware or software mode actually, the application-specific and design constraint depending on technical scheme.Specialty
Technical staff can use different methods to realize described function to each specific application, but this realization should
Think beyond the scope of this invention.
The step of method described in conjunction with the embodiments described herein or algorithm, directly can be held with hardware, processor
Capable software module, or the combination of the two is implementing.Software module can be placed in random access memory (RAM), internal memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
Above the apparatus and method that a kind of converter valve bridge arm provided by the present invention forms equipotential body have been carried out in detail
Thin introduction.Specific case used herein is set forth to the principle of the present invention and embodiment, and above example is said
Bright it is only intended to help and understands the method for the present invention and its core concept.It should be pointed out that the ordinary skill for the art
For personnel, under the premise without departing from the principles of the invention, some improvement and modification can also be carried out to the present invention, these improvement
Also fall in the protection domain of the claims in the present invention with modification.
Claims (10)
1. a kind of converter valve bridge arm forms the device of equipotential body, it is characterised in that the device includes：Bridge arm, the first kind are short
Relay part, Equations of The Second Kind shorting member；
The bridge arm includes at least one valve tower, and each valve tower includes at least two valve tower layers, in each valve tower between adjacent valve tower layer
It is connected in series, each valve tower layer includes at least two submodules, is connected in series between adjacent submodule, and the submodule includes outlet
Level and enter line level；
Wherein, a first kind shorting member is arranged at the outlet level of a submodule and enters between line level；
One Equations of The Second Kind shorting member is arranged between the lead-in wire terminal and leading-out terminal of a valve tower layer.
2. device as claimed in claim 1, it is characterised in that the first kind shorting member includes short circuit copper film.
3. device as claimed in claim 1, it is characterised in that the submodule includes：Rectifier, the first transistor, second
Transistor, the first diode, the second diode, resistance, electric capacity；
Wherein, the positive pole of rectifier is connected with the emitter stage of the first transistor, the negative pole of rectifier and the current collection of the first transistor
Extremely it is connected, the base earth of the first transistor；The negative pole of the first diode is connected with the colelctor electrode of the first transistor, positive pole and
The emitter stage of one transistor is connected；The emitter stage of the first transistor is connected with one end of resistance, the colelctor electrode of the first transistor with
Transistor seconds emitter stage is connected；Transistor seconds base earth；The negative pole of the second diode and the colelctor electrode of transistor seconds
It is connected, positive pole is connected with the emitter stage of transistor seconds；The colelctor electrode of transistor seconds is connected with the other end of the resistance；Electricity
The two ends of appearance are connected with the two ends of resistance respectively；
Wherein, outlet level and to enter line level be two leads for connecting rectifier two ends, a connection in two leads is whole
One end of stream device, another other end for connecting the rectifier.
4. device as claimed in claim 1, it is characterised in that the outlet level of each submodule and enter line level and be respectively provided with
One short circuit point, Equations of The Second Kind shorting member be arranged at the short circuit point for entering line level of first submodule of a valve tower layer and
The short circuit point of the outlet level of last submodule.
5. device as claimed in claim 1, it is characterised in that the lead-in wire terminal and leading-out terminal of each valve tower layer is respectively provided with
Individual short circuit point, Equations of The Second Kind shorting member are arranged at the short circuit point and the short circuit point of leading-out terminal of the lead-in wire terminal of a valve tower layer.
6. device as claimed in claim 1, it is characterised in that the Equations of The Second Kind shorting member includes shorting stub.
7. device as claimed in claim 1, it is characterised in that also include：Series resonance pressure test part, wherein, described
Series resonance pressure test part includes power supply, frequency conversion tank, excitation-transformation variable, controllable impedance, wherein,
Described frequency conversion tank one end is connected with the power supply, and the other end is connected with the excitation-transformation variable；Described excitation-transformation variable one end with described
Frequency conversion tank is connected, and the other end is connected with the controllable impedance, and the excitation-transformation variable is connected with ground wire；Described controllable impedance one end with
The excitation-transformation variable is connected, and the other end is connected with the leading-out terminal of the valve tower of underproof bridge arm, wherein, the leading-out terminal of first valve tower
It is connected with the lead-in wire terminal of second valve tower, is connected in series between the valve tower, the leading-out terminal and controllable impedance of last valve tower
It is connected.
8. a kind of method that converter valve bridge arm forms equipotential body, it is characterised in that based on any one of claim 1 to 7 institute
The converter valve bridge arm that states forms the device of equipotential body, and the method includes：
The outlet level of each submodule in each valve tower in each bridge arm underproof and line level first kind short circuit portion will be entered
Part connects；
The end of incoming cables of each valve tower layer and leading-out terminal are connected with Equations of The Second Kind shorting member.
9. method as claimed in claim 8, it is characterised in that the converter valve bridge arm also includes after forming equipotential body：
By adjusting the size of controllable impedance so that the series resonance pressure test that the bridge arm that is tested in the converter valve is located is returned
The series resonance frequency on road is controlled in the range of predetermined power frequency.
10. method as claimed in claim 9, it is characterised in that the series resonance frequency in the series resonance pressure test loop
Rate control includes in the method in the range of predetermined power frequency：
The overall ground capacitance of the bridge arm that is tested in measurement converter valve；
Adjust the size of inductance in series resonance pressure test loop；
Calculate the series resonance frequency in the series resonance pressure test loop that the bridge arm that is tested in converter valve is located；
When the series resonance frequency carries out series resonance pressure test in the range of predetermined power frequency, then.
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| 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 |
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| 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 |
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| CN104237754B true CN104237754B (en) | 2017-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429831A (en) * | 2019-08-16 | 2019-11-08 | 南京南瑞继保工程技术有限公司 | Converter valve |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532072B (en) * | 2020-03-26 | 2022-03-29 | 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 |
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| CN104237754A (en) | 2014-12-24 |
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