CN208597024U - A kind of high-power high voltage test no partial discharge frequency conversion power supply and its resonant experimental device - Google Patents
A kind of high-power high voltage test no partial discharge frequency conversion power supply and its resonant experimental device Download PDFInfo
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Abstract
The utility model discloses a kind of high-power high voltage test no partial discharge frequency conversion power supply and its resonant experimental devices comprising signal generator, digital regulation resistance, prime power amplifier, bridge-type power amplifier, current rectifying and wave filtering circuit, pre- closing circuit and quick current foldback circuit；The sine wave signal that signal generator generates a standard carries out frequency by digital regulation resistance and voltage is adjusted, its output signal pushes directly on prime power amplifier, prime power amplifier is divided into two-way output, synchro source identical with test frequency is generated all the way and is supplied to a PD meter, and another way pushes bridge-type power amplifier；Pre- closing circuit connection current rectifying and wave filtering circuit and bridge-type power amplifier；Bridge-type power amplifier forms four bridge arms by four high power transistors, and each bridge arm is made of 1,000 or more coupled in parallel.The utility model realizes high-power output from initial micropower signal source by repeatedly amplification using amplification principle step by step, meets test needs.
Description
[technical field]
It is specifically a kind of to can be used for AC the utility model relates to a kind of device and method of electric power system power source technical field
The no partial discharge frequency conversion power supply and its resonant experimental device of 500kV high-tension apparatus On-Site Testing.
[background technique]
With the continuous development of China's electric system, user proposes higher want to equipment for power transmission and distribution and transmission reliability
It asks, the voltage class for needing scene to carry out the power equipment of pressure test is also higher and higher, therefore the change to ac voltage withstanding test
Higher requirements are also raised for the capacity and power of frequency power.
The capacity for the separate unit variable-frequency power sources now having in the domestic market can no longer meet such equipment for power transmission and distribution and transmission
The test of cable, though useful parallel variable-frequency power sources, but due to system circulation or output are nonsynchronous, so that simultaneously
Join the variable-frequency power sources that uses and unstable, or even also affects the stability of system.
Existing technical literature is retrieved and is found, Chinese patent CN202103582U describes a kind of " parallel to put without part
Electric frequency conversion boosting power device " discloses a kind of frequency conversion boosting power device of parallel connection, using the output of two variable-frequency power sources
End is coupled with the paralleling model that two input windings of separate unit exciting transformer are realized, realizes the superposition of power.But
Above-mentioned technology is not designed into when two variable-frequency power sources outputs are asynchronous, can generate biggish direct current to exciting transformer primary side
Excitation, when DC excitation is very big, exciting transformer primary side can shove, core sataration, and exciting transformer can be sent out when serious
Raw burn is ruined, system crash, and meeting crisis is had to the safety to people, equipment or even power grid, therefore on variable-frequency power sources paralleling model
Solve two variable-frequency power sources output is asynchronous and circulation problem.
Chinese patent CN102545640A discloses a kind of " flexible frequency conversion device ", and the technology is by two high-voltage frequency converters
Constitute, one therein is used as primary transducer, remaining is used as from frequency converter, the output end of primary transducer by interlocking switch,
Synchronous reactance with respectively connect from the output end of the inversion circuit of high-voltage frequency converter, primary transducer by interlocking switch with respectively from frequency conversion
The inversion circuit of device is mutually connected in series, respectively from the central point of the inversion circuit of frequency converter, primary transducer controller with from frequency conversion
Controller in device establishes communication connection, and controller in primary transducer issues modulated signal, to primary transducer and from frequency converter
Control is carried out, is consistent each frequency converter in space vector PWM modulation control, to guarantee the output frequency of principal and subordinate's frequency converter
Rate, voltage, phase are consistent.But the technology is not directed between principal and subordinate's frequency converter that communication signal type is more, and principal and subordinate is easily caused to control
The misunderstanding code of device processed, the false triggering that even will cause IGBT, occur accident.
[utility model content]
One of main purpose of the utility model is to provide a kind of high-power high voltage test no partial discharge frequency conversion power supply, greatly
Power output is realized high-power defeated using the principle amplified step by step from the signal source of initial micropower by repeatedly amplification
Out, meet test needs.
The utility model is achieved through the following technical solutions above-mentioned purpose: no partial discharge frequency conversion is used in a kind of test of high-power high voltage
Power supply comprising signal generator, digital regulation resistance, prime power amplifier, bridge-type power amplifier, current rectifying and wave filtering circuit, pre- conjunction
Lock circuit and the quick current foldback circuit that overcurrent protection is carried out to the bridge-type power amplifier；
The sine wave signal that the signal generator generates a standard carries out frequency adjusting by the digital regulation resistance
It is adjusted with voltage, the output signal after overregulating pushes directly on the prime power amplifier, and the prime power amplifier is divided into
Two-way output, wherein generating synchro source identical with test frequency all the way is supplied to a PD meter, in addition all the way described in promotion
Bridge-type power amplifier；
The pre- closing circuit is electrically connected the current rectifying and wave filtering circuit and the bridge-type power amplifier；
The bridge-type power amplifier forms four bridge arms by four equivalent high power transistors, each bridge arm mainly by
1000 or more equivalent transistors compose in parallel.
It further, further include the forced air cooling to radiate to the bridge-type power amplifier.
Further, the current rectifying and wave filtering circuit includes three-phase bridge rectifier circuit, is mainly made of inductance and capacitor
Filter circuit.
Further, the DC supply of the no partial discharge frequency conversion power supply is directly derived from three-phase 380V AC power, warp
It is sent into the three-phase bridge rectifier circuit with the vacuum switch of overcurrent and fast tripping protection, becomes pulsating direct current, via the filter
Pulsating direct current is become bridge-type power amplifier described in smooth direct-current power supply by wave circuit.
Further, the control method of the pre- closing circuit is the first capacitor charging into the filter circuit, to electricity
Capacity charge electric current closes a floodgate again when reaching setting value.
Further, negative feedback module is provided in the bridge-type power amplifier, the negative feedback module includes control institute
The single-chip microcontroller of bridge-type power amplifier power amplifier part is stated, is electrically connected with the single-chip microcontroller and acquires the bridge-type power amplifier and institute
State the output voltage Acquisition Circuit, the detection the forced air cooling entrance wind-warm syndrome and outlet wind-warm syndrome of prime power amplifier output end
Temperature sensing circuit, the temperature sensing circuit and the single-chip microcontroller are electrically connected.
Further, every equivalent transistor both ends of bridge-type power amplifier freewheeling diode in parallel, it is described
The output end of bridge-type power amplifier is provided with filter capacitor, is provided with exciting transformer between the output end and test item.
Another main purpose of the utility model is to provide a kind of based on high-power high voltage test no partial discharge frequency conversion electricity
The resonant experimental device of source parallel running comprising power supply, the phase-shifting transformer being connect with the power supply, with it is described
The no partial discharge frequency conversion power supply group of several parallel connections of phase-shifting transformer output end connection is connect with the variable-frequency power sources group output end
Intermediate transformer, several reactors being connect with the intermediate transformer output end.
Compared with prior art, a kind of high-power high voltage test no partial discharge frequency conversion power supply of the utility model and its resonance try
The beneficial effect of experiment device is: the high-power output of frequency changing power device is using the principle amplified step by step, that is, before first passing around
Grade power amplifier and bridge circuit are amplified step by step, then pass through in bridge-type power amplifier in each bridge arm thousands of it is in parallel
Equivalent transistor carries out multistage amplification, finally realizes after repeatedly amplifying from the signal source of initial micropower high-power defeated
Out, meet test needs；Air cooling system and negative feedback module has also been devised in bridge-type power amplifier, passes through real-time monitoring bridge-type
The drift situation that power amplifier output voltage occurs because temperature heats up, and feed back and arrive single-chip microcontroller, pass through the upper of connection single-chip microcontroller
Position machine software is modified waveform, reduces irregularity of wave form, then the power amplifier part of bridge-type power amplifier is controlled by single-chip microcontroller,
So that output voltage is more stable；By more variable-frequency power sources parallel runnings to improve output capacity, by parallel running
No partial discharge frequency conversion power supply power supply use the phase-shifting transformer mode of connection, be obviously improved rectification circuit pulse number, significantly
The harmonic current of injected system when reducing variable-frequency power sources parallel running.
[Detailed description of the invention]
Fig. 1 is the principle framework schematic diagram of the utility model embodiment no partial discharge frequency conversion power supply；
Fig. 2 is the schematic illustration of bridge-type power amplifier in the utility model embodiment；
Fig. 3 is the principle framework schematic diagram of bridge-type power amplifier and negative-feedback circuit in the utility model embodiment；
Fig. 4 is the wiring schematic diagram that resonant experimental device in case is compared in the utility model embodiment；
Fig. 5 is that case resonant experimental device simulation result input voltage and current harmonics are compared in the utility model embodiment
Containing spirogram；
Fig. 6 is that the utility model embodiment compares case resonant experimental device simulation result current harmonic content figure；
Fig. 7 is the wiring schematic diagram of the utility model embodiment resonant experimental device；
Fig. 8 is the utility model embodiment resonant experimental device simulation result input voltage and current harmonic content figure；
Fig. 9 is the utility model embodiment resonant experimental device simulation result current harmonic content figure.
[specific embodiment]
Embodiment:
The present embodiment is high-power high voltage test no partial discharge frequency conversion power supply and its resonant experimental device, for the prior art
Deficiency, disclose a kind of using amplifying step by step, realize the variable-frequency power sources of high-power output, frequency changing power device it is high-power defeated
High-power output is realized from the signal source of initial micropower by repeatedly amplification using the principle amplified step by step out, thus
Meet test needs.
Please refer to Fig. 1, the present embodiment high-power high voltage test no partial discharge frequency conversion power supply comprising signal generator, number
Word potentiometer, prime power amplifier, bridge-type power amplifier, the forced air cooling, current rectifying and wave filtering circuit, pre- closing circuit and fast
Fast current foldback circuit, the sine wave signal that the signal generator generates a standard carry out frequency by the digital regulation resistance
Rate adjusting and voltage adjusting, this process are also frequency adjusting and voltage adjusting during the test, and frequency at this time is the same as test
Frequency is identical, and frequency measurement is just completed in signal source part；Output signal after overregulating pushes directly on the prime function
There is preliminary power output on electric discharge road, and the prime power amplifier is divided into two-way output, wherein generating all the way identical as test frequency
Synchro source be supplied to a PD meter；In addition all the way for pushing the bridge-type power amplifier, the bridge-type power amplifier
It is exactly the major part of high-power generation, its calorific value is very big during the test, and therefore, the present embodiment passes through air blast cooling system
System is to radiate to the bridge-type power amplifier.
The current rectifying and wave filtering circuit includes three-phase bridge rectifier circuit and the filter circuit that is made of inductance and capacitor.It is described
380V alternating current is changed into direct current needed for each circuit module in no partial discharge frequency conversion power supply by current rectifying and wave filtering circuit.The pre- conjunction
Lock circuit and the quick current foldback circuit and the current rectifying and wave filtering circuit are electrically connected, and the quick current foldback circuit is real
Overcurrent protection now is carried out to the current rectifying and wave filtering circuit.
The power supply line of the current rectifying and wave filtering circuit is arranged in the quick current foldback circuit and the pre- closing circuit
On, the overcurrent protection to the current rectifying and wave filtering circuit is realized by the on-off of the pre- closing circuit.
The DC supply of no partial discharge frequency conversion power supply is directly derived from three-phase 380V AC power, through with overcurrent and quick-break
The vacuum switch of protection is sent into three-phase bridge rectifier circuit, becomes pulsating direct current, the filter circuit formed via inductance and capacitor
Pulsating direct current is become into bridge-type power amplifier (5~1350kW) described in smooth direct-current power supply.Since filter capacitance reaches
To tens of thousands of microfarads, direct combined floodgate charging current is very big, it is possible to and cause low pressure total power switch to trip, therefore this implementation in systems
Example increases pre- closing circuit: first charging, closes a floodgate again when capacitance charging current is smaller, thus not to filter capacitor through low current
Biggish inrush current can be generated so that system starting be easy it is simple and reliable.
- Fig. 3 referring to figure 2., the bridge-type power amplifier is by four of the high power transistor Q1-Q4 power amplifier formed
Bridge arm, each bridge arm are composed in parallel by thousands of equivalent transistors, and take effective stream measure and safeguard measure.
Negative feedback module is devised in the bridge-type power amplifier, the negative feedback module includes controlling the bridge-type power amplifier
The single-chip microcontroller of circuit power amplifier part is electrically connected with the single-chip microcontroller and acquires the bridge-type power amplifier and the prime power amplifier
Output voltage Acquisition Circuit, the detection the forced air cooling entrance wind-warm syndrome and the temperature detection for exporting wind-warm syndrome of circuit output end
Circuit, the temperature sensing circuit and the single-chip microcontroller are electrically connected.
, small wave distortion is corrected, guarantees that irregularity of wave form is small.The heat dissipation of bridge-type power amplifier part is forced
Air cooling way is radiated by the forced air cooling, and is equipped with detection entrance wind-warm syndrome and is exported the detection circuit of wind-warm syndrome, temperature
Directly in the liquid crystal screen display of control cabinet.The power amplifier part of the bridge-type power amplifier is made defeated by single-chip microcontroller real-time control
Voltage is not drifted about by the raising of temperature out, and is equipped with output voltage because of the software negative-feedback technology of temperature drift, makes output electricity
It presses more stable.
Q1-Q4 is four equivalent transistors, when positive half cycle, simulates the base stage of driving signal Q1, Q4 transistor, Q1, Q3 are cut
Only；Q1, Q4 conducting, electric current are formed the positive half cycle of sine wave by Q1 to Q4 again to load.Analog signal pushes Q2, Q3 when negative half period
Base stage, Q1, Q4 cut-off, Q2, Q3 conducting, electric current forms the negative half period of sine wave by Q3 to load to Q2 again, thus loading
One complete sine wave of upper composition.
Every equivalent transistor both ends of bridge-type power amplifier freewheeling diode in parallel, is provided in output end
Filter capacitor is provided with transformer between output end and test item, which is exciting transformer.Inside variable frequency power source
Have a power failure suddenly, not will cause open loop state in subject transformer or series resonant tank and intermediate step-up transformer, and always
There are an energy release channels.It can be seen that no matter variable frequency power source internal fault or external power supply have a power failure suddenly, it is tested transformation
Device or resonant tank are there is no cutting off, and entirely different with general no-load transformer, there is no so that electric current is forced zero passage, thus frequency conversion
Power supply not will cause subject load and generate overvoltage.
The connection of variable-frequency power sources and control cabinet and divider and control cabinet is all made of optical fiber connection type, is thoroughly isolated,
The damage that the counterattack after test product is punched causes control cabinet is avoided, use is safer.
Since live high voltage power supply condition is limited, generally cooperate high pressure resonance device in such a way that changeable frequency power is in parallel
Output capacity is improved, meets the needs of On-Site Testing high-power high-voltage.Since variable-frequency power sources mostly uses uncontrollable three
Phase bridge rectifier can make power grid supply current generate biggish harmonic components, total for capacitor after more parallel runnings
Amount increases, and the content of harmonic current is bigger, brings certain influence to the power supply quality of power grid.It can from rectified three-phase circuit analysis
Know, the rectification circuit output pulse number the more more are conducive to improve the efficiency of device energy conversion and reduce the pulsation of output voltage,
Meanwhile the fairing of pulse number as much as possible is to the harmonic content for reducing alternating current-direct current two sides and the power factor of raising system
Play the role of vital.
Therefore, the present embodiment additionally provide it is a kind of based on high-power high voltage test no partial discharge frequency conversion power sources in parallel operation
Resonant experimental device comprising power supply, the phase-shifting transformer being connect with the power supply, defeated with the phase-shifting transformer
Outlet connection several parallel connections no partial discharge frequency conversion power supply group, connect with the variable-frequency power sources group output end intermediate transformer,
Several reactors being connect with the intermediate transformer output end.
It is no partial discharge frequency conversion power supply group power supply in parallel by using phase-shifting transformer, more pulse numbers can be generated,
To reduce output voltage pulsation, reduce alternating current-direct current two sides harmonic content, rectification circuit pulse number is available to be obviously improved, greatly
The harmonic current of injected system when big reduction variable-frequency power sources parallel running.
In the present embodiment resonant experimental device, the number of units of no partial discharge frequency conversion power supply is by required power supply capacity and separate unit without partial discharge
The output voltage of variable-frequency power sources codetermines, according to required Capacity Selection number of units suitably in parallel；Phase shift in phase-shifting transformer
Angle need to be cooperated with phase shift group number.
In order to verify resonant experimental device of the present embodiment based on high-power high voltage test no partial discharge frequency conversion power supply for
The effect of harmonics restraint, the present embodiment have carried out contrast simulation experiment.
Condition requirement: certain 3000kVA powersupply system uses 10kV input transformer, supplies electricity to 5 450kW without office
Variable-frequency power sources is put, a whole set of pilot system for cooperating intermediate transformer and 8 80A/26H reactors to constitute.When whole system is tested,
High-pressure side total losses reach 2000kW, in addition variable-frequency power sources own loss, power supply capacity need 3000kVA.
Comparison scheme: wiring schematic diagram is as shown in Figure 4；Input voltage harmonic content is as shown in Figure 5 after emulation.In Fig. 5, U1
=9986.47V；Each harmonic voltage content is respectively as follows: Uh3=24.16V；Uh5=90.23V；Uh7=20.69V；Uh9=
13.27V；Uh11=41.61V.Since other harmonic voltage contents are smaller, other harmonic waves do not bring calculating into, in input voltage
Harmonic content are as follows:
Voltage total harmonic distortion factor:
It analyzes from above-mentioned calculated result it is found that voltage total harmonic distortion factor only has 1.1%, within the allowable range.
Current harmonic content is as shown in Figure 6.Wherein, fundamental current I1=152.97A, individual harmonic current content difference
Are as follows: Ih3=24A；Ih5=52.31A；Ih7=14.47A；Ih9=4.68A；Ih11=10.22A only considers that 11 subharmonic are defeated
Enter the harmonic content in electric current are as follows:
Current total harmonic distortion rate:
From the analysis of above-mentioned calculated result it is found that voltage total harmonic distortion factor reaches 39%, electricity is allowed well beyond system
Flow harmonic content.
The simulation result of the present embodiment is as follows:
Transformer uses the phase-shifting transformer mode of connection, and pilot system wiring schematic diagram is as shown in Figure 7.
In Fig. 7, phase-shifting transformer secondary winding is made of 5 groups of secondary windings, each secondary winding output voltage phase difference
It is 12 °.
The harmonic wave of output voltage that artificial circuit measures contains spirogram as depicted in figure 8, wherein U1=9986.07V；Each harmonic contains
It measures as follows: Uh3=27.28V；Uh5=83.66V；Uh7=23.12V；Uh9=15.64V；Uh11=39.26V；Input voltage
In harmonic content are as follows:
Voltage total harmonic distortion factor:
Voltage total harmonic distortion factor only has 1%, slightly improves, within the allowable range.
Current harmonics is as shown in Figure 9, it can be seen that current harmonics is greatly reduced, and only 11 times and following harmonic wave, base
It is as follows to involve each harmonic content: I1=155.81A；Ih3=20.65A；Ih5=10.56A；Ih7=0；Ih9=0；Ih11
=10.23A, the harmonic content in input current are as follows:
Current total harmonic distortion rate:
Current total harmonic distortion rate is reduced to 16.3% by original 39%, has substantially reduced compared with common electrical distribution transformer,
Very close with system allowable current harmonic content, design parameter is slightly adjusted and can be met the requirements.
Above-described is only some embodiments of the utility model.For those of ordinary skill in the art,
Without departing from the concept of the present invention, various modifications and improvements can be made, these belong to practical
Novel protection scope.
Claims (9)
1. a kind of high-power high voltage test no partial discharge frequency conversion power supply, it is characterised in that: it includes signal generator, digital current potential
Device, prime power amplifier, bridge-type power amplifier, current rectifying and wave filtering circuit, pre- closing circuit and to the bridge-type power amplifier into
The quick current foldback circuit of row overcurrent protection；
The sine wave signal that the signal generator generates a standard carries out frequency adjusting and electricity by the digital regulation resistance
Pressure is adjusted, and the output signal after overregulating pushes directly on the prime power amplifier, and the prime power amplifier is divided into two-way
In addition output pushes the bridge-type wherein generating synchro source identical with test frequency all the way is supplied to a PD meter all the way
Power amplifier；
The pre- closing circuit is electrically connected the current rectifying and wave filtering circuit and the bridge-type power amplifier；
The bridge-type power amplifier forms four bridge arms by four equivalent high power transistors, and each bridge arm is mainly by 1,000
Or more equivalent transistor compose in parallel.
2. high-power high voltage test no partial discharge frequency conversion power supply as described in claim 1, it is characterised in that: further include to described
The forced air cooling that bridge-type power amplifier radiates.
3. high-power high voltage test no partial discharge frequency conversion power supply as described in claim 1, it is characterised in that: the rectifying and wave-filtering
The filter circuit that circuit includes three-phase bridge rectifier circuit, is mainly made of inductance and capacitor.
4. high-power high voltage test no partial discharge frequency conversion power supply as claimed in claim 3, it is characterised in that: the no partial discharge becomes
The DC supply of frequency power is directly derived from three-phase 380V AC power, send through the vacuum switch with overcurrent and fast tripping protection
Enter the three-phase bridge rectifier circuit, become pulsating direct current, pulsating direct current is become into smooth direct current via the filter circuit
Bridge-type power amplifier described in power supply.
5. high-power high voltage as claimed in claim 3 test no partial discharge frequency conversion power supply, it is characterised in that: described pre- to close a floodgate back
The control method on road is the first capacitor charging into the filter circuit, is closed a floodgate again when capacitance charging current reaches setting value.
6. high-power high voltage test no partial discharge frequency conversion power supply as claimed in claim 2, it is characterised in that: the bridge-type power amplifier
Negative feedback module is provided in circuit, the negative feedback module includes the monolithic for controlling the bridge-type power amplifier power amplifier part
Machine, the output electricity that the bridge-type power amplifier and the prime power amplifier output end are electrically connected and acquired with the single-chip microcontroller
Press Acquisition Circuit, the detection the forced air cooling entrance wind-warm syndrome and the temperature sensing circuit for exporting wind-warm syndrome, the temperature detection
Circuit and the single-chip microcontroller are electrically connected.
7. high-power high voltage test no partial discharge frequency conversion power supply as described in claim 1, it is characterised in that: the bridge-type power amplifier
Every equivalent transistor both ends of circuit freewheeling diode in parallel, the output end of the bridge-type power amplifier are provided with filtering
Capacitor is provided with exciting transformer between the output end and test item.
8. high-power high voltage test no partial discharge frequency conversion power supply as claimed in claim 3, it is characterised in that: the quick overcurrent
Protection circuit and the pre- closing circuit are arranged in the power supply line of the current rectifying and wave filtering circuit, pass through the pre- closing circuit
On-off realize overcurrent protection to the current rectifying and wave filtering circuit.
9. a kind of resonant experimental device based on high-power high voltage test no partial discharge frequency conversion power supply as described in claim 1,
It is characterized by: it includes that power supply, the phase-shifting transformer connecting with the power supply and the phase-shifting transformer export
Hold connection several parallel connection no partial discharge frequency conversion power supply group, connect with the variable-frequency power sources group output end intermediate transformer, and
Several reactors of the intermediate transformer output end connection.
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| CN108599586A (en) * | 2018-06-26 | 2018-09-28 | 国网浙江省电力有限公司 | A kind of high-power high voltage experiment no partial discharge frequency conversion power supply and its resonant experimental device of parallel running |
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2018
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| CN108599586A (en) * | 2018-06-26 | 2018-09-28 | 国网浙江省电力有限公司 | A kind of high-power high voltage experiment no partial discharge frequency conversion power supply and its resonant experimental device of parallel running |
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