CN206258548U - A kind of distribution net equipment alternating current-direct current pressure-resistant apparatus - Google Patents
A kind of distribution net equipment alternating current-direct current pressure-resistant apparatus Download PDFInfo
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- CN206258548U CN206258548U CN201621068924.6U CN201621068924U CN206258548U CN 206258548 U CN206258548 U CN 206258548U CN 201621068924 U CN201621068924 U CN 201621068924U CN 206258548 U CN206258548 U CN 206258548U
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Abstract
The utility model provides a kind of distribution net equipment alternating current-direct current pressure-resistant apparatus, including the observing and controlling loop and DC voltage generator, switch switch and alternating current-direct current inverter of user instruction input block and main control unit major loop；User instruction input block obtains the operational order that user is the test of direct current, industrial frequency AC or frequency multiplication ac voltage withstanding；Main control unit receives the operational order of user instruction input block, produces different control instructions, adjust instruction and inversion instruction；DC voltage generator produces corresponding direct current according to adjust instruction；Switch switch realizes that DC break down voltage test or power frequency and frequency multiplication ac voltage withstanding test galvanic switching according to control instruction；Alternating current-direct current inverter is used to be instructed according to current inversion, and inversion alternating current realizes power frequency or the test of frequency multiplication ac voltage withstanding.Implement the utility model, the experiment of direct current, industrial frequency AC and frequency multiplication ac voltage withstanding can be completed to distribution net equipment simultaneously, so as to reduce test apparatus and device species, reduce acquisition cost and occupied ground area.
Description
Technical field
The utility model is related to distribution net equipment voltage-withstand test technical field, more particularly to a kind of distribution net equipment alternating current-direct current is pressure-resistant
Device.
Background technology
With the development of power technology, distribution net equipment species is more and more complete, but in order to meet country and professional standard
Requirement so that all kinds of distribution net equipments all need to be tested.Generally, the pilot project of distribution net equipment include insulation measurement,
D.C. resistance experiment, loop resistance experiment, voltage change ratio experiment and Insulation Test etc., and as the important examination examination of distribution net equipment
The Insulation Test one of tested, mainly includes DC break down voltage experiment, industrial frequency AC pressure test and the experiment of frequency multiplication ac voltage withstanding.
In the prior art, due to the test apparatus and the single-function of experimental rig of distribution net equipment Insulation Test so that
Complete the different instrument of different pressure tests needs or device (needs high voltage direct current generator, work when such as DC break down voltage is tested
Frequency ac voltage withstanding needs industrial frequency AC pressure-resistant apparatus when testing, a times frequency power is then needed during the experiment of frequency multiplication ac voltage withstanding), thus it is false
If above-mentioned three Insulation Tests need to be completed simultaneously, will cause use test apparatus and device species it is various, acquisition cost is high, and
Take larger test site.
Therefore, a kind of distribution net equipment alternating current-direct current pressure-resistant apparatus are needed badly, DC break down voltage, work can be completed to distribution net equipment simultaneously
Frequency ac voltage withstanding and frequency multiplication ac voltage withstanding are tested, so as to reduce test apparatus and device species, are reduced acquisition cost and are taken field
Ground area.
Utility model content
The utility model embodiment technical problem to be solved is, there is provided a kind of distribution net equipment alternating current-direct current is resistance to be press-fited
Put, can be while completing DC break down voltage to distribution net equipment, industrial frequency AC is pressure-resistant and the experiment of frequency multiplication ac voltage withstanding, so as to reduce experiment
Instrument and device species, reduce acquisition cost and occupied ground area.
In order to solve the above-mentioned technical problem, the utility model embodiment press-fits there is provided a kind of distribution net equipment alternating current-direct current is resistance to
Put, the distribution net equipment alternating current-direct current pressure-resistant apparatus include major loop and observing and controlling loop；Wherein,
The observing and controlling loop includes user instruction input block and main control unit；Wherein, the user instruction input block
One end be connected with the first end of the main control unit；
The major loop includes DC voltage generator, switch switch and alternating current-direct current inverter；Wherein, the direct current
The external alternating-current voltage source of first end of voltage generator, the second end is connected with the first end of the switch switch, the 3rd end
It is connected with the second end of the main control unit；The switch switch also includes be connected with the end of the main control unit the 3rd second
The 3rd end that is connected with the alternating current-direct current inverter first end of end and for realizing that DC break down voltage tests the of direct current electricity output
Four ends；Also include the second end being connected with the end of the main control unit the 4th on the alternating current-direct current inverter and for realizing that power frequency is handed over
3rd end of stream voltage-withstand test or frequency multiplication ac voltage withstanding test exchange electricity output.
Wherein, the DC voltage generator includes boosting isolating transformer, the first driver element, three-phase tri-level voltage
Source type PWM rectifier and wave filter；Wherein,
The external alternating-current voltage source in one end of the boosting isolating transformer, the other end and the three-phase tri-level voltage
The first end of source type PWM rectifier is connected；
One end of first driver element is connected with the second end of the main control unit, and the other end and the three-phase three are electric
Second end of level voltage source type PWM rectifier is connected；
3rd end of the three-phase tri-level voltage-source type PWM rectifier is connected with one end of the wave filter；
The other end of the wave filter is connected with the first end of the switch switch.
Wherein, the three-phase tri-level voltage-source type PWM rectifier includes the first inductance, the second inductance, the 3rd inductance, the
One IGBT pipes, the 2nd IGBT pipes, the 3rd IGBT pipes, the 4th IGBT pipes, the 5th IGBT pipes, the 6th IGBT pipes, the 7th IGBT pipes, the
Eight IGBT pipes, the 9th IGBT pipes, the tenth IGBT pipes, the 11st IGBT pipes, the 12nd IGBT pipes, the first diode, the two or two pole
Pipe, the 3rd diode, the 4th diode, the 5th diode, the 6th diode, the first DC voltage-stabilizing electric capacity and the second DC voltage-stabilizing
Electric capacity；Wherein,
The first IGBT pipes, the 2nd IGBT pipes, the 3rd IGBT pipes, the 4th IGBT pipes, the described 5th
IGBT pipes, the 6th IGBT pipes, the 7th IGBT pipes, the 8th IGBT pipes, the 9th IGBT pipes, the described tenth
IGBT pipes, the 11st IGBT pipes and the 12nd IGBT pipes are in parallel by a switching transistor with a diode reverse
Formed；
The first DC voltage-stabilizing electric capacity and the second DC voltage-stabilizing capacitances in series into the first DC voltage-stabilizing capacitor loop,
And the two ends of the first DC voltage-stabilizing capacitor loop are connected with first driver element；
The first IGBT pipes, the 4th IGBT pipes, the 7th IGBT pipes are sequentially connected in series with the tenth IGBT pipes
Into an IGBT loops；One end of first inductance is held with the A phases of the boosting isolating transformer and is connected, first inductance
The other end be connected between the 4th IGBT pipe and the 7th IGBT pipes；The first IGBT loops are straight with described first
Stream electric capacity of voltage regulation loop is in parallel, and sets two poles in the positive pole of the first DC voltage-stabilizing electric capacity and an IGBT pipes
Pipe negative pole is connected, and the negative pole of the second DC voltage-stabilizing electric capacity is connected with the diode cathode in the tenth IGBT pipes；It is described
First diode and the 4th Diode series into the first diode circuit, the negative pole of first diode are connected to described
First IGBT is managed and the 4th IGBT pipes between, and the positive pole of the 4th diode is connected to the 7th IGBT and manages and described
Between tenth IGBT pipes；
The 2nd IGBT pipes, the 5th IGBT pipes, the 8th IGBT pipes are gone here and there successively with the 11st IGBT pipes
It is unified into the 2nd IGBT loops；One end of second inductance is held with the B phases of the boosting isolating transformer and is connected, second electricity
The other end of sense is connected between the 5th IGBT pipes and the 8th IGBT pipes；The 2nd IGBT loops and described first
DC voltage-stabilizing capacitor loop is in parallel, and set in the positive pole of the first DC voltage-stabilizing electric capacity and the 2nd IGBT pipes two
Pole pipe negative pole is connected, and the negative pole of the second DC voltage-stabilizing electric capacity is connected with the diode cathode in the 11st IGBT pipes；
Second diode and the 5th Diode series into the second diode circuit, the negative pole of second diode are connected to
Between 2nd IGBT pipe and the 5th IGBT pipes, the positive pole of the 5th diode be connected to the 8th IGBT pipes and
Between the 11st IGBT pipes；
The 3rd IGBT pipes, the 6th IGBT pipes, the 9th IGBT pipes are gone here and there successively with the 12nd IGBT pipes
It is unified into the 3rd IGBT loops；One end of 3rd inductance is held with the C phases of the boosting isolating transformer and is connected, the 3rd electricity
The other end of sense is connected between the 6th IGBT pipes and the 9th IGBT pipes；The 3rd IGBT loops and described first
DC voltage-stabilizing capacitor loop is in parallel, and set in the positive pole of the first DC voltage-stabilizing electric capacity and the 3rd IGBT pipes two
Pole pipe negative pole is connected, and the negative pole of the second DC voltage-stabilizing electric capacity is connected with the diode cathode in the 12nd IGBT pipes；
3rd diode and the 6th Diode series into the 3rd diode circuit, the negative pole of the 3rd diode are connected to
Between 3rd IGBT pipe and the 6th IGBT pipes, the positive pole of the 6th diode be connected to the 9th IGBT pipes and
Between the 12nd IGBT pipes；
Between first diode and the 4th diode, second diode and the 5th diode it
Between, the first DC voltage-stabilizing electric capacity and described second straight is both connected between the 3rd diode and the 6th diode
In the same point being connected between stream electric capacity of voltage regulation.
Wherein, the alternating current-direct current inverter includes single-phase three-level voltage source type PWM inverter and the second driver element；Its
In,
One end of second driver element is connected with the 4th end of the main control unit, the other end and it is described it is single-phase three electricity
The first end of level voltage source type PWM inverter is connected；
Second end of the single-phase three-level voltage source type PWM inverter is connected with the 3rd end of the switch switch,
3rd end is used to realize the exchange electricity output of industrial frequency AC test or frequency multiplication alternating-current measurement.
Wherein, the single-phase three-level voltage source type PWM inverter includes the 4th inductance, the 5th inductance, the 13rd IGBT
Pipe, the 14th IGBT pipes, the 15th IGBT pipes, the 16th IGBT pipes, the 17th IGBT pipes, the 18th IGBT pipes, the 19th
IGBT pipes, the 20th IGBT pipes, the 7th diode, the 8th diode, the 9th diode, the tenth diode, the 3rd DC voltage-stabilizing
Electric capacity and the 4th DC voltage-stabilizing electric capacity；Wherein,
The 13rd IGBT pipes, the 14th IGBT pipes, the 15th IGBT are managed, the 16th IGBT is managed,
The 17th IGBT pipes, the 18th IGBT pipes, the 19th IGBT pipes and the 20th IGBT pipes are opened by one
The diode reverse of transistor AND gate one is closed to be in parallel to be formed；
The 3rd DC voltage-stabilizing electric capacity with the 4th DC voltage-stabilizing capacitances in series into the second DC voltage-stabilizing capacitor loop,
And the two ends of the second DC voltage-stabilizing capacitor loop are connected with second driver element；
The 13rd IGBT pipes, the 15th IGBT pipes, the 17th IGBT pipes are managed with the 19th IGBT
It is sequentially connected in series into the 4th IGBT loops；One end of 4th inductance is used to export power frequency or the frequency multiplication alternating current produced after inversion
U phases hold, the other end of the 4th inductance is connected between the 15th IGBT pipes and the 17th IGBT pipes；It is described
4th IGBT loops are in parallel with the second DC voltage-stabilizing capacitor loop, and set the positive pole of the 3rd DC voltage-stabilizing electric capacity
It is connected with the diode cathode in the 13rd IGBT pipes, the negative pole and the described 19th of the 4th DC voltage-stabilizing electric capacity
Diode cathode in IGBT pipes is connected；7th diode with the 9th Diode series into the 4th diode circuit,
The negative pole of the 7th diode is connected between the 13rd IGBT pipes and the 15th IGBT pipes, the 9th 2 pole
The positive pole of pipe is connected between the 17th IGBT pipes and the 19th IGBT pipes；
The 14th IGBT pipes, the 16th IGBT pipes, the 18th IGBT pipes are managed with the 20th IGBT
It is sequentially connected in series into the 5th IGBT loops；One end of 5th inductance is used to export power frequency or the frequency multiplication alternating current produced after inversion
V phases hold, the other end of the 5th inductance is connected between the 16th IGBT pipes and the 18th IGBT pipes；It is described
5th IGBT loops are in parallel with the second DC voltage-stabilizing capacitor loop, and set the positive pole of the 3rd DC voltage-stabilizing electric capacity
It is connected with the diode cathode in the 14th IGBT pipes, the negative pole and the described 20th of the 4th DC voltage-stabilizing electric capacity
Diode cathode in IGBT pipes is connected；8th diode with the tenth Diode series into the 5th diode circuit,
The negative pole of the 8th diode is connected between the 14th IGBT pipes and the 16th IGBT pipes, the 12nd pole
The positive pole of pipe is connected between the 18th IGBT pipes and the 20th IGBT pipes；
Between 7th diode and the 9th diode, between the 8th diode and the tenth diode
It is both connected in same point connected between the 3rd DC voltage-stabilizing electric capacity and the 4th DC voltage-stabilizing electric capacity.
Wherein, the distribution net equipment alternating current-direct current pressure-resistant apparatus also include direct current voltage sensor, AC voltage sensor and
Signal processing unit；Wherein,
One end of the direct current voltage sensor is connected with the 4th end of the switch switch, the other end and the signal
The first end of processing unit is connected, the direct current size for sensing direct output；
One end of the AC voltage sensor is connected with the 3rd end of the alternating current-direct current inverter, the other end and the letter
Second end of number processing unit is connected, for sensing the power frequency or frequency multiplication exchange TV university that are exported after the alternating current-direct current inverter inversion
It is small；
3rd end of the signal processing unit is connected with the 5th end of the main control unit, for by direct current or exchange
Electricity is converted into corresponding data signal and sends into the main control unit being analyzed and process.
Wherein, the switch switch is formed by two independent relays.
Implement the utility model embodiment, have the advantages that：
1st, in the utility model embodiment, the different surveys that main control unit is set according to user in user instruction input block
Examination information formed different control instructions, adjust instruction and inversion instruction, control DC voltage generator, switch switch and
Alternating current-direct current inverter forms corresponding voltage for meeting DC break down voltage test, industrial frequency AC voltage-withstand test or frequency multiplication ac voltage withstanding
Needed for test, therefore, it is possible to complete DC break down voltage to distribution net equipment simultaneously, industrial frequency AC is pressure-resistant and the experiment of frequency multiplication ac voltage withstanding, from
And test apparatus and device species are reduced, reduce acquisition cost and occupied ground area；
2nd, in the utility model embodiment, the three-phase tri-level voltage-source type PWM rectifier with IGBT as core is used
With single-phase three-level voltage source type PWM inverter, can require and set according to user, export the DC voltage of different amplitudes, or
Person exports the alternating voltage of different amplitudes and different frequency, can carry out DC break down voltage, industrial frequency withstand voltage, sensing simultaneously to distribution net equipment
Pressure test, three kinds of functions are concentrated in together, powerful, are controlled simple and convenient；
3rd, in the utility model embodiment, the three-phase tri-level voltage-source type PWM rectifier of use and single-phase three level
Voltage-source type PWM inverter is the topological structure of three level, and the rectifier/inverter for overcoming two level topological structures is being answered
, it is necessary to be used in series using the power switch pipe of back-pressure high or by multiple power switch pipes during for high pressure occasion, while overcoming
Rectifier/inverter ac side the output voltage of two level topological structures causes humorous when level switching switching frequency is not high
The problems such as ripple content is relatively large, improves AC waveform quality；
4th, in the utility model embodiment, the isolating transformer of use effectively realizes electrical primary side and secondary side
Isolation, mains by harmonics and interference can be prevented to be delivered to voltage-source type PWM converter, and then ensure to obtain more stable straight
Stream output voltage, therefore with to power network interference it is small the characteristics of.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, obtaining other accompanying drawings according to these accompanying drawings still falls within category of the present utility model.
One system structure diagram of the distribution net equipment alternating current-direct current pressure-resistant apparatus that Fig. 1 is provided for the utility model embodiment；
Fig. 2 is the system structure diagram of DC voltage generator in Fig. 1；
Fig. 3 is the circuit connection diagram of three-phase tri-level voltage-source type PWM rectifier in Fig. 2；
Fig. 4 is the system structure diagram of alternating current-direct current inverter in Fig. 1；
Fig. 5 is the circuit connection diagram of single-phase three-level voltage source type PWM inverter in Fig. 4；
Another system architecture of the distribution net equipment alternating current-direct current pressure-resistant apparatus that Fig. 6 is provided for the utility model embodiment is illustrated
Figure.
Specific embodiment
It is new to this practicality below in conjunction with accompanying drawing to make the purpose of this utility model, technical scheme and advantage clearer
Type is described in further detail.
As shown in figure 1, in the utility model embodiment, there is provided a kind of distribution net equipment alternating current-direct current pressure-resistant apparatus, it is described
Distribution net equipment alternating current-direct current pressure-resistant apparatus include major loop 1 and observing and controlling loop 2；Wherein,
Observing and controlling loop 2 includes user instruction input block 21 and main control unit 22；Wherein, user instruction input block 22
One end is connected with the first end c1 of main control unit 21；
Major loop 1 includes DC voltage generator 11, switch switch 12 and alternating current-direct current inverter 13；Wherein,
The external alternating-current voltage sources of first end a1 of DC voltage generator 11, the second end a2 and the of switch switch 12
One end b1 is connected, and the 3rd end a3 is connected with the second end c2 of main control unit 22；
Switch switch 12 also includes the second end b2 and alternating current-direct current inverter 13 that are connected with the end c3 of main control unit 22 the 3rd
The 3rd first end d1 connected end b3 and the 4th end b4 for realizing DC break down voltage test direct current electricity output；
Also include the second end d2 being connected with the end c4 of main control unit 22 the 4th on alternating current-direct current inverter 13 and for realizing work
Frequency ac voltage withstanding is tested or frequency multiplication ac voltage withstanding tests the 3rd end d3 of exchange electricity output.
It is understood that switch switch 12 is formed by two independent relays；Wherein, a relay is used to lead
The direct current that logical or shut-off DC voltage generator 11 is directly exported, another relay is used on or off direct current pressure
The direct current of the raw output of device 11 is into being reverse into corresponding power frequency or frequency multiplication alternating current in alternating current-direct current inverter 13；Switch switch
12 can also have two relays of normally opened contact, wherein, a normally opened contact is used on or off direct current pressure
The direct current that raw device 11 is directly exported, another normally opened contact is used for the direct current of the output of on or off DC voltage generator 11
Corresponding power frequency or frequency multiplication alternating current are reverse into electricity entrance alternating current-direct current inverter 13；Switch switch 12 can also be double double-pole
Throw switch.
In the utility model embodiment, as shown in Fig. 2 DC voltage generator 11 include boosting isolating transformer 111,
First driver element 112, three-phase tri-level voltage-source type PWM rectifier 113 and wave filter 114；Wherein,
One end external AC potential source of boosting isolating transformer 111, the other end is whole with three-phase tri-level voltage-source type PWM
The first end e1 for flowing device 113 is connected；
One end of first driver element 112 is connected with the second end c2 of main control unit 22, and the other end is electric with three-phase tri-level
Second end e2 of potential source type PWM rectifier 113 is connected；
3rd end e3 of three-phase tri-level voltage-source type PWM rectifier 113 is connected with one end of wave filter 114；
The other end of wave filter 114 is connected with the first end b1 of switch switch 12.
It should be noted that the isolation in order to effectively realize electrical primary side and secondary side, can prevent mains by harmonics
Three-phase tri-level voltage-source type PWM rectifier is delivered to interference, and then ensures to obtain more stable VD, because
It is the isolating transformer less than 1/50 that this boosting isolating transformer 111 uses no-load voltage ratio.
In one embodiment, as shown in figure 3, in order that distribution net equipment alternating current-direct current pressure-resistant apparatus to possess output ripple small
DC voltage, the advantages of output accuracy is high, dynamic transients are functional, therefore three-phase tri-level voltage-source type PWM rectifier
113 include the first inductance L1, the second inductance L2, the 3rd inductance L3, an IGBT pipes VT1, the 2nd IGBT pipes VT2, the 3rd IGBT
Pipe VT3, the 4th IGBT pipes VT4, the 5th IGBT pipes VT5, the 6th IGBT pipes VT6, the 7th IGBT pipes VT7, the 8th IGBT pipes VT8,
9th IGBT pipes VT9, the tenth IGBT pipes VT10, the 11st IGBT pipes VT11, the 12nd IGBT pipes VT12, the first diode VD1,
It is second diode VD2, the 3rd diode VD3, the 4th diode VD4, the 5th diode VD5, the 6th diode VD6, first straight
Stream electric capacity of voltage regulation C1 and the second DC voltage-stabilizing electric capacity C2；Wherein,
First IGBT pipes VT1, the 2nd IGBT pipes VT2, the 3rd IGBT pipes VT3, the 4th IGBT pipes VT4, the 5th IGBT pipes
VT5, the 6th IGBT pipes VT6, the 7th IGBT pipes VT7, the 8th IGBT pipes VT8, the 9th IGBT pipes VT9, the tenth IGBT pipes VT10,
11 IGBT pipes VT11, the 12nd IGBT pipes VT12 are in parallel to be formed by a switching transistor with a diode reverse；
First DC voltage-stabilizing electric capacity C1 and the second DC voltage-stabilizing electric capacity C2 are connected into the first DC voltage-stabilizing capacitor loop, and
The two ends (i.e. P, N two ends) in one direct current electric capacity of voltage regulation loop are connected with the first driver element 112；
First IGBT pipes VT1, the 4th IGBT pipes VT4, the 7th IGBT pipes VT7 and the tenth IGBT pipes VT10 are sequentially connected in series into
One IGBT loops；One end of first inductance L1 is held with the A phases of boosting isolating transformer 111 and is connected, the other end of the first inductance L1
It is connected between the 4th IGBT pipes VT4 and the 7th IGBT pipes VT7；First IGBT loops are with the first DC voltage-stabilizing capacitor loop phase simultaneously
Join, and the positive pole (+) of the first DC voltage-stabilizing electric capacity C1 is set and be connected with the diode cathode in an IGBT pipes VT1, second is straight
The negative pole (-) of stream electric capacity of voltage regulation C2 is connected with the diode cathode in the tenth IGBT pipes VT10；First diode VD1 and the four or two
Pole pipe VD4 is connected into the first diode circuit, and the negative pole of the first diode VD1 is connected to an IGBT pipes VT1 and the 4th IGBT
Between pipe VT4, the positive pole of the 4th diode VD4 is connected between the 7th IGBT pipes VT7 and the tenth IGBT pipes VT10；
2nd IGBT pipes VT2, the 5th IGBT pipes VT5, the 8th IGBT pipes VT8 and the 11st IGBT pipes VT11 are sequentially connected in series into
2nd IGBT loops；One end of second inductance L2 is held with the B phases of boosting isolating transformer 111 and is connected, and the second inductance L2's is another
End is connected between the 5th IGBT pipes VT5 and the 8th IGBT pipes VT8；2nd IGBT loops and the first DC voltage-stabilizing capacitor loop phase
Parallel connection, and set the first DC voltage-stabilizing electric capacity C1 positive pole (+) be connected with the diode cathode in the 2nd IGBT pipes VT2, second
The negative pole (-) of DC voltage-stabilizing electric capacity C2 is connected with the diode cathode in the 11st IGBT pipes VT11；Second diode VD2 and
Five diode VD5 are connected into the second diode circuit, and the negative pole of the second diode VD2 is connected to the 2nd IGBT pipes VT2 and the 5th
Between IGBT pipes VT5, the positive pole of the 5th diode VD5 is connected between the 8th IGBT pipes VT8 and the 11st IGBT pipes VT11；
3rd IGBT pipes VT3, the 6th IGBT pipes VT6, the 9th IGBT pipes VT9 and the 12nd IGBT pipes VT12 are sequentially connected in series into
3rd IGBT loops；One end of 3rd inductance L3 is held with the C phases of boosting isolating transformer 111 and is connected, and the 3rd inductance L3's is another
End is connected between the 6th IGBT pipes VT6 and the 9th IGBT pipes VT9；3rd IGBT loops and the first DC voltage-stabilizing capacitor loop phase
Parallel connection, and set the first DC voltage-stabilizing electric capacity C1 positive pole (+) be connected with the diode cathode in the 3rd IGBT pipes VT3, second
The negative pole (-) of DC voltage-stabilizing electric capacity C2 is connected with the diode cathode in the 12nd IGBT pipes VT12；3rd diode VD3 and
Six diode VD6 are connected into the 3rd diode circuit, and the negative pole of the 3rd diode VD3 is connected to the 3rd IGBT pipes VT3 and the 6th
Between IGBT pipes VT6, the positive pole of the 6th diode VD6 is connected between the 9th IGBT pipes VT9 and the 12nd IGBT pipes VT12；
Between first diode VD1 and the 4th diode VD4, between the second diode VD2 and the 5th diode VD5,
The first DC voltage-stabilizing electric capacity C1 and the second DC voltage-stabilizing electric capacity C2 is both connected between three diode VD3 and the 6th diode VD6
Between be connected same point O on.
In the utility model embodiment, as shown in figure 4, alternating current-direct current inverter 13 includes single-phase three-level voltage source type
The driver element 132 of PWM inverter 131 and second；Wherein,
One end of second driver element 132 is connected with the 4th end c4 of main control unit 22, and the other end and single-phase three level are electric
The first end f1 of potential source type PWM inverter 131 is connected；
Second end f2 of single-phase three-level voltage source type PWM inverter 131 is connected with the 3rd end b3 of switch switch 12,
3rd end f3 is used to realize the exchange electricity output of industrial frequency AC test or frequency multiplication alternating-current measurement.
In one embodiment, as shown in figure 5, in order that distribution net equipment alternating current-direct current pressure-resistant apparatus to possess output ripple small
DC voltage, the advantages of output accuracy is high, dynamic transients are functional, the single-phase three-level voltage source type PWM inverter
131 include the 4th inductance L4, the 5th inductance L5, the 13rd IGBT pipes VT13, the 14th IGBT pipes VT14, the 15th IGBT pipes
VT15, the 16th IGBT pipes VT16, the 17th IGBT pipes VT17, the 18th IGBT pipes VT18, the 19th IGBT pipes VT19, second
It is ten IGBT pipes VT20, the 7th diode VD7, the 8th diode VD8, the 9th diode VD9, the tenth diode VD10, the 3rd straight
Stream electric capacity of voltage regulation C3 and the 4th DC voltage-stabilizing electric capacity C4；Wherein,
13rd IGBT pipes VT13, the 14th IGBT pipes VT14, the 15th IGBT pipes VT15, the 16th IGBT pipes VT16,
17th IGBT pipes VT17, the 18th IGBT pipes VT18, the 19th IGBT pipes VT19, the 20th IGBT pipes VT20 are by a switch
The diode reverse of transistor AND gate one is in parallel to be formed；
3rd DC voltage-stabilizing electric capacity C3 and the 4th DC voltage-stabilizing electric capacity C4 are connected into the second DC voltage-stabilizing capacitor loop, and
The two ends (i.e. P ＇, N ＇) of two DC voltage-stabilizing capacitor loops are connected with the second driver element 132；
13rd IGBT pipes VT13, the 15th IGBT pipes VT15, the 17th IGBT pipes VT17 and the 19th IGBT pipes VT19
It is sequentially connected in series into the 4th IGBT loops；One end of 4th inductance L4 is used to exporting the power frequency that produces after inversion or frequency multiplication alternating current
U phases are held, and the other end of the 4th inductance L4 is connected between the 15th IGBT pipes VT15 and the 17th IGBT pipes VT17；4th IGBT
Loop is in parallel with the second DC voltage-stabilizing capacitor loop, and sets the positive pole (+) and the 13rd of the 3rd DC voltage-stabilizing electric capacity C3
Diode cathode in IGBT pipes VT13 is connected, in the negative pole (-) and the 19th IGBT pipes VT19 of the 4th DC voltage-stabilizing electric capacity C4
Diode cathode be connected；7th diode VD7 and the 9th diode VD9 are connected into the 4th diode circuit, the 7th diode
The negative pole of VD7 is connected between the 13rd IGBT pipes VT13 and the 15th IGBT pipes VT15, the positive pole connection of the 9th diode VD9
Between the 17th IGBT pipes VT17 and the 19th IGBT pipes VT19；
14th IGBT pipes VT14, the 16th IGBT pipes VT16, the 18th IGBT pipes VT18 and the 20th IGBT pipes VT20
It is sequentially connected in series into the 5th IGBT loops；One end of 5th inductance L5 is used to exporting the power frequency that produces after inversion or frequency multiplication alternating current
V phases are held, and the other end of the 5th inductance L5 is connected between the 16th IGBT pipes VT16 and the 18th IGBT pipes VT18；5th IGBT
Loop is in parallel with the second DC voltage-stabilizing capacitor loop, and sets the positive pole (+) and the 14th of the 3rd DC voltage-stabilizing electric capacity C3
Diode cathode in IGBT pipes VT14 is connected, in the negative pole (-) and the 20th IGBT pipes VT20 of the 4th DC voltage-stabilizing electric capacity C4
Diode cathode be connected；8th diode VD8 and the tenth diode VD10 are connected into the 5th diode circuit, the 8th diode
The negative pole of VD8 is connected between the 14th IGBT pipes VT14 and the 16th IGBT pipes VT16, and the positive pole of the tenth diode VD10 connects
It is connected between the 18th IGBT pipes VT18 and the 20th IGBT pipes VT20；
Between 7th diode VD7 and the 9th diode VD9, between the 8th diode VD8 and the tenth diode VD10
It is connected on the same point O ＇ being connected between the 3rd DC voltage-stabilizing electric capacity C3 and the 4th DC voltage-stabilizing electric capacity C4.
As shown in fig. 6, for real-time adjustment DC break down voltage, industrial frequency AC is pressure-resistant or the required electricity of frequency multiplication ac voltage withstanding test
Pressure, therefore distribution net equipment alternating current-direct current pressure-resistant apparatus also include direct current voltage sensor 3, AC voltage sensor 4 and signal transacting
Unit 5；Wherein,
One end of direct current voltage sensor 3 is connected with the 4th end b4 of switch switch 12, the other end and signal transacting list
The first end g1 of unit 5 is connected；
One end of AC voltage sensor 4 is connected with the 3rd end d3 of alternating current-direct current inverter 13, the other end and signal transacting
Second end g2 of unit 5 is connected；
3rd end g3 of signal processing unit 5 is connected with the 5th end c5 of main control unit 22.
The operation principle of the distribution net equipment alternating current-direct current pressure-resistant apparatus in the utility model embodiment is：
1st, user by user instruction input block 21 set test-types (DC break down voltage, industrial frequency AC are pressure-resistant or frequency multiplication
Ac voltage withstanding is tested), test voltage, alternating current voltage frequency, and the voltage type of the setting, amplitude and frequency are formed accordingly
It is analyzed and judges in operational order feeding main control unit 22；
If the 2, carrying out DC break down voltage test, main control unit 22 produces the first control instruction to carry out the of controlling switch switch 12
Turned off between first end b1 and the 3rd end b3 that switch 12 is turned on and switched between one end b1 and the 4th end b4, produce first
The first driver element 111 in adjust instruction feeding DC voltage generator 11, by first driver element 112 to the electricity of three-phase three
Each IGBT pipes carry out cut-offfing control in level voltage source type PWM rectifier 113, and output direct current is directly used in DC break down voltage test；
3rd, in order to meet the accuracy and accuracy of DC break down voltage test voltage, gathered directly by direct current voltage sensor 3
Stream output voltage, and extraction DC voltage is straight with what user was set in feeding main control unit 22 after the treatment of signal processing unit 5
Stream voltage is compared, and regenerates during new the first adjust instruction sends into the first driver element 112, by first driver element
Each IGBT pipes are re-started and cut-off control in 112 pairs of three-phase tri-level voltage-source type PWM rectifiers 113 so that three-phase tri-level
The DC voltage of the output setting of voltage-source type PWM rectifier 113；
If the 4, carrying out industrial frequency AC voltage-withstand test, main control unit 22 produces the second control instruction to carry out controlling switch switch 12
First end b1 and the 4th end b4 between shut-off and switch switch 12 first end b1 and the 3rd end b3 between turn on, produce
The first driver element 111 in second adjust instruction feeding DC voltage generator 11, by first driver element 112 to three-phase
Each IGBT pipes carry out cut-offfing control in three-level voltage source type PWM rectifier 113, and output direct current enters alternating current-direct current inverter 13
In single-phase three-level voltage source type PWM inverter 131, now to produce the first inversion instruction feeding second to drive single for main control unit 22
In unit 132, each IGBT pipes in single-phase three-level voltage source type PWM inverter 131 are cut-off by second driver element 132
Control, the alternating current needed for inversion goes out is used for industrial frequency AC voltage-withstand test；
5th, in order to meet the accuracy and accuracy of industrial frequency AC voltage-withstand test voltage, adopted by AC voltage sensor 4
Collection ac output voltage, and extraction DC voltage is set with user in feeding main control unit 22 after the treatment of signal processing unit 5
DC voltage be compared, regenerate during new the second adjust instruction sends into the first driver element 112, first driven by this
Unit 112 is re-started to each IGBT pipes in three-phase tri-level voltage-source type PWM rectifier 113 and cut-offs control so that three-phase three
The DC voltage of the output setting of power level voltage source type PWM rectifier 113, then by the second driver element 132 to single-phase three level
Each IGBT pipes carry out cut-offfing control in voltage-source type PWM inverter 131, and inversion goes out set alternating voltage；
6th, similarly, if carrying out frequency multiplication ac voltage withstanding test, main control unit 22 produces the 3rd control instruction to carry out controlling switch and cuts
Led between first end b1 and the 3rd end b3 that switch 12 is turned off and switched between the first end b1 and the 4th end b4 of parallel operation 12
It is logical, the first driver element 111 in the 3rd adjust instruction feeding DC voltage generator 11 is produced, by first driver element
Each IGBT pipes carry out cut-offfing control in 112 pairs of three-phase tri-level voltage-source type PWM rectifiers 113, and output direct current enters hands over straight
Single-phase three-level voltage source type PWM inverter 131 in stream inverter 13, the now generation of main control unit 22 second inversion instruction feeding
In second driver element 132, by second driver element 132 to each IGBT in single-phase three-level voltage source type PWM inverter 131
Pipe is carried out cut-offfing control, and the alternating current needed for inversion goes out is tested for frequency multiplication ac voltage withstanding；
7th, in order to meet the accuracy and accuracy of frequency multiplication ac voltage withstanding test voltage, adopted by AC voltage sensor 4
Collection ac output voltage, and extraction DC voltage is set with user in feeding main control unit 22 after the treatment of signal processing unit 5
DC voltage be compared, regenerate during new the 3rd adjust instruction sends into the first driver element 112, first driven by this
Unit 112 is re-started to each IGBT pipes in three-phase tri-level voltage-source type PWM rectifier 113 and cut-offs control so that three-phase three
The DC voltage of the output setting of power level voltage source type PWM rectifier 113, then by the second driver element 132 to single-phase three level
Each IGBT pipes carry out cut-offfing control in voltage-source type PWM inverter 131, and inversion goes out set alternating voltage；.
Implement the utility model embodiment, have the advantages that：
1st, in the utility model embodiment, the different surveys that main control unit is set according to user in user instruction input block
Examination information formed different control instructions, adjust instruction and inversion instruction, control DC voltage generator, switch switch and
Alternating current-direct current inverter forms corresponding voltage for meeting DC break down voltage test, industrial frequency AC voltage-withstand test or frequency multiplication ac voltage withstanding
Needed for test, therefore, it is possible to complete DC break down voltage to distribution net equipment simultaneously, industrial frequency AC is pressure-resistant and the experiment of frequency multiplication ac voltage withstanding, from
And test apparatus and device species are reduced, reduce acquisition cost and occupied ground area；
2nd, in the utility model embodiment, the three-phase tri-level voltage-source type PWM rectifier with IGBT as core is used
With single-phase three-level voltage source type PWM inverter, can require and set according to user, export the DC voltage of different amplitudes, or
Person exports the alternating voltage of different amplitudes and different frequency, can carry out DC break down voltage, industrial frequency withstand voltage, sensing simultaneously to distribution net equipment
Pressure test, three kinds of functions are concentrated in together, powerful, are controlled simple and convenient；
3rd, in the utility model embodiment, the three-phase tri-level voltage-source type PWM rectifier of use and single-phase three level
Voltage-source type PWM inverter is the topological structure of three level, and the rectifier/inverter for overcoming two level topological structures is being answered
, it is necessary to be used in series using the power switch pipe of back-pressure high or by multiple power switch pipes during for high pressure occasion, while overcoming
Rectifier/inverter ac side the output voltage of two level topological structures causes humorous when level switching switching frequency is not high
The problems such as ripple content is relatively large, improves AC waveform quality；
4th, in the utility model embodiment, the isolating transformer of use effectively realizes electrical primary side and secondary side
Isolation, mains by harmonics and interference can be prevented to be delivered to voltage-source type PWM converter, and then ensure to obtain more stable straight
Stream output voltage, therefore with to power network interference it is small the characteristics of.
Above disclosed is only a kind of preferred embodiment of the utility model, can not limit this practicality with this certainly
New interest field, therefore the equivalent variations made according to the utility model claim, still belong to what the utility model was covered
Scope.
Claims (7)
1. a kind of distribution net equipment alternating current-direct current pressure-resistant apparatus, it is characterised in that the distribution net equipment alternating current-direct current pressure-resistant apparatus include master
Loop and observing and controlling loop；Wherein,
The observing and controlling loop includes user instruction input block and main control unit；Wherein, the one of the user instruction input block
End is connected with the first end of the main control unit；
The major loop includes DC voltage generator, switch switch and alternating current-direct current inverter；Wherein, the DC voltage
The external alternating-current voltage source of first end of generator, the second end is connected with the first end of the switch switch, the 3rd end and institute
The second end for stating main control unit is connected；It is described switch switch also include be connected with the end of the main control unit the 3rd the second end,
The 3rd end being connected with the alternating current-direct current inverter first end and for realizing DC break down voltage test direct current electricity output the 4th
End；Also include the second end being connected with the end of the main control unit the 4th on the alternating current-direct current inverter and for realizing industrial frequency AC
3rd end of voltage-withstand test or frequency multiplication ac voltage withstanding test exchange electricity output.
2. distribution net equipment alternating current-direct current pressure-resistant apparatus as claimed in claim 1, it is characterised in that the DC voltage generator bag
Include boosting isolating transformer, the first driver element, three-phase tri-level voltage-source type PWM rectifier and wave filter；Wherein,
The external alternating-current voltage source in one end of the boosting isolating transformer, the other end and the three-phase tri-level voltage-source type
The first end of PWM rectifier is connected；
One end of first driver element is connected with the second end of the main control unit, and the other end and the three-phase tri-level are electric
Second end of potential source type PWM rectifier is connected；
3rd end of the three-phase tri-level voltage-source type PWM rectifier is connected with one end of the wave filter；
The other end of the wave filter is connected with the first end of the switch switch.
3. distribution net equipment alternating current-direct current pressure-resistant apparatus as claimed in claim 2, it is characterised in that the three-phase tri-level voltage source
Type PWM rectifier includes the first inductance, the second inductance, the 3rd inductance, IGBT pipes, the 2nd IGBT pipes, the 3rd IGBT pipes, the
Four IGBT pipes, the 5th IGBT pipes, the 6th IGBT pipes, the 7th IGBT pipes, the 8th IGBT pipes, the 9th IGBT pipes, the tenth IGBT pipes, the
11 IGBT pipes, the 12nd IGBT pipes, the first diode, the second diode, the 3rd diode, the 4th diode, the five or two pole
Pipe, the 6th diode, the first DC voltage-stabilizing electric capacity and the second DC voltage-stabilizing electric capacity；Wherein,
The first IGBT pipes, the 2nd IGBT pipes, the 3rd IGBT pipes, the 4th IGBT pipes, the 5th IGBT
Pipe, the 6th IGBT pipes, the 7th IGBT pipes, the 8th IGBT pipes, the 9th IGBT pipes, the tenth IGBT
Pipe, the 11st IGBT pipes and the 12nd IGBT pipes are in parallel shape by a switching transistor and a diode reverse
Into；
The first DC voltage-stabilizing electric capacity and the second DC voltage-stabilizing capacitances in series into the first DC voltage-stabilizing capacitor loop, and institute
The two ends for stating the first DC voltage-stabilizing capacitor loop are connected with first driver element；
First IGBT pipe, the 4th IGBT pipes, the 7th IGBT pipes and the tenth IGBT pipes are sequentially connected in series into the
One IGBT loops；One end of first inductance is held and is connected with the A phases of the boosting isolating transformer, first inductance it is another
One end is connected between the 4th IGBT pipes and the 7th IGBT pipes；The first IGBT loops are steady with first direct current
Voltage capacitance loop is in parallel, and it is negative to set the diode in the positive pole and an IGBT pipes of the first DC voltage-stabilizing electric capacity
Extremely it is connected, the negative pole of the second DC voltage-stabilizing electric capacity is connected with the diode cathode in the tenth IGBT pipes；Described first
Diode and the 4th Diode series into the first diode circuit, the negative pole of first diode are connected to described first
IGBT is managed and the 4th IGBT pipes between, and the positive pole of the 4th diode is connected to the 7th IGBT pipes and the described tenth
Between IGBT pipes；
The 2nd IGBT pipes, the 5th IGBT pipes, the 8th IGBT pipes are sequentially connected in series into the 11st IGBT pipes
2nd IGBT loops；One end of second inductance is held with the B phases of the boosting isolating transformer and is connected, second inductance
The other end is connected between the 5th IGBT pipes and the 8th IGBT pipes；The 2nd IGBT loops and first direct current
Electric capacity of voltage regulation loop is in parallel, and sets the diode in the positive pole of the first DC voltage-stabilizing electric capacity and the 2nd IGBT pipes
Negative pole is connected, and the negative pole of the second DC voltage-stabilizing electric capacity is connected with the diode cathode in the 11st IGBT pipes；It is described
Second diode and the 5th Diode series into the second diode circuit, the negative pole of second diode are connected to described
2nd IGBT is managed and the 5th IGBT pipes between, and the positive pole of the 5th diode is connected to the 8th IGBT and manages and described
Between 11st IGBT pipes；
The 3rd IGBT pipes, the 6th IGBT pipes, the 9th IGBT pipes are sequentially connected in series into the 12nd IGBT pipes
3rd IGBT loops；One end of 3rd inductance is held with the C phases of the boosting isolating transformer and is connected, the 3rd inductance
The other end be connected between the 6th IGBT pipe and the 9th IGBT pipes；The 3rd IGBT loops are straight with described first
Stream electric capacity of voltage regulation loop is in parallel, and sets two poles in the positive pole of the first DC voltage-stabilizing electric capacity and the 3rd IGBT pipes
Pipe negative pole is connected, and the negative pole of the second DC voltage-stabilizing electric capacity is connected with the diode cathode in the 12nd IGBT pipes；Institute
The 3rd diode and the 6th Diode series into the 3rd diode circuit are stated, the negative pole of the 3rd diode is connected to institute
State between the 3rd IGBT pipes and the 6th IGBT pipes, the positive pole of the 6th diode is connected to the 9th IGBT pipes and institute
State between the 12nd IGBT pipes；
Between first diode and the 4th diode, between second diode and the 5th diode, institute
State and the first DC voltage-stabilizing electric capacity is both connected between the 3rd diode and the 6th diode and second direct current is steady
In the same point being connected between voltage capacitance.
4. distribution net equipment alternating current-direct current pressure-resistant apparatus as claimed in claim 1, it is characterised in that the alternating current-direct current inverter includes
Single-phase three-level voltage source type PWM inverter and the second driver element；Wherein,
One end of second driver element is connected with the 4th end of the main control unit, and the other end and single-phase three level are electric
The first end of potential source type PWM inverter is connected；
Second end of the single-phase three-level voltage source type PWM inverter is connected with the 3rd end of the switch switch, and the 3rd
Hold the exchange electricity output for realizing industrial frequency AC test or frequency multiplication alternating-current measurement.
5. distribution net equipment alternating current-direct current pressure-resistant apparatus as claimed in claim 4, it is characterised in that the single-phase three-level voltage source
Type PWM inverter includes the 4th inductance, the 5th inductance, the 13rd IGBT pipes, the 14th IGBT pipes, the 15th IGBT pipes, the tenth
Six IGBT pipes, the 17th IGBT pipes, the 18th IGBT pipes, the 19th IGBT pipes, the 20th IGBT pipes, the 7th diode, the 8th
Diode, the 9th diode, the tenth diode, the 3rd DC voltage-stabilizing electric capacity and the 4th DC voltage-stabilizing electric capacity；Wherein,
The 13rd IGBT pipes, the 14th IGBT pipes, the 15th IGBT are managed, the 16th IGBT is managed, described
17th IGBT pipes, the 18th IGBT pipes, the 19th IGBT pipes and the 20th IGBT pipes are brilliant by a switch
Body Guan Yuyi diode reverses are in parallel to be formed；
The 3rd DC voltage-stabilizing electric capacity and the 4th DC voltage-stabilizing capacitances in series into the second DC voltage-stabilizing capacitor loop, and institute
The two ends for stating the second DC voltage-stabilizing capacitor loop are connected with second driver element；
The 13rd IGBT pipes, the 15th IGBT pipes, the 17th IGBT pipes are managed successively with the 19th IGBT
It is connected into the 4th IGBT loops；One end of 4th inductance is used to export the U of the power frequency or frequency multiplication alternating current produced after inversion
Xiang Duan, the other end of the 4th inductance is connected between the 15th IGBT pipes and the 17th IGBT pipes；Described
Four IGBT loops are in parallel with the second DC voltage-stabilizing capacitor loop, and set the positive pole of the 3rd DC voltage-stabilizing electric capacity with
Diode cathode in the 13rd IGBT pipes is connected, negative pole and the 19th IGBT of the 4th DC voltage-stabilizing electric capacity
Diode cathode in pipe is connected；7th diode with the 9th Diode series into the 4th diode circuit, it is described
The negative pole of the 7th diode is connected between the 13rd IGBT pipes and the 15th IGBT pipes, the 9th diode
Positive pole is connected between the 17th IGBT pipes and the 19th IGBT pipes；
The 14th IGBT pipes, the 16th IGBT pipes, the 18th IGBT pipes are managed successively with the 20th IGBT
It is connected into the 5th IGBT loops；One end of 5th inductance is used to export the V of the power frequency or frequency multiplication alternating current produced after inversion
Xiang Duan, the other end of the 5th inductance is connected between the 16th IGBT pipes and the 18th IGBT pipes；Described
Five IGBT loops are in parallel with the second DC voltage-stabilizing capacitor loop, and set the positive pole of the 3rd DC voltage-stabilizing electric capacity with
Diode cathode in the 14th IGBT pipes is connected, negative pole and the 20th IGBT of the 4th DC voltage-stabilizing electric capacity
Diode cathode in pipe is connected；8th diode with the tenth Diode series into the 5th diode circuit, it is described
The negative pole of the 8th diode is connected between the 14th IGBT pipes and the 16th IGBT pipes, the tenth diode
Positive pole is connected between the 18th IGBT pipes and the 20th IGBT pipes；
Connect between 7th diode and the 9th diode, between the 8th diode and the tenth diode
It is connected in the same point being connected between the 3rd DC voltage-stabilizing electric capacity and the 4th DC voltage-stabilizing electric capacity.
6. distribution net equipment alternating current-direct current pressure-resistant apparatus as any one of claim 1 to 5, it is characterised in that the distribution
Equipment alternating current-direct current pressure-resistant apparatus also include direct current voltage sensor, AC voltage sensor and signal processing unit；Wherein,
One end of the direct current voltage sensor is connected with the 4th end of the switch switch, the other end and the signal transacting
The first end of unit is connected；
One end of the AC voltage sensor is connected with the 3rd end of the alternating current-direct current inverter, at the other end and the signal
The second end for managing unit is connected；
3rd end of the signal processing unit is connected with the 5th end of the main control unit.
7. distribution net equipment alternating current-direct current pressure-resistant apparatus as claimed in claim 6, it is characterised in that the switch switch is by two
Independent relay is formed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459245A (en) * | 2018-03-12 | 2018-08-28 | 北京四方继保自动化股份有限公司 | A kind of Intelligent insulating voltage-withstand test circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459245A (en) * | 2018-03-12 | 2018-08-28 | 北京四方继保自动化股份有限公司 | A kind of Intelligent insulating voltage-withstand test circuit |
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