CN104701868B - A kind of current disturbing source of variable voltage level - Google Patents
A kind of current disturbing source of variable voltage level Download PDFInfo
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- CN104701868B CN104701868B CN201510142046.1A CN201510142046A CN104701868B CN 104701868 B CN104701868 B CN 104701868B CN 201510142046 A CN201510142046 A CN 201510142046A CN 104701868 B CN104701868 B CN 104701868B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The present invention provides the current disturbing source of a kind of variable voltage level, including charging resistor R1 being sequentially connected with and by-pass switch KM BP thereof, rectifier transformer tap switching catalyst KM1, KM2 ... KMn, rectifier transformer, back-to-back power cell and filter unit；Described rectifier transformer primary side winding is many taps winding, and rectifier transformer vice-side winding is multiple secondary winding, and each vice-side winding connects a back-to-back power cell, and described charging resistor connects three-phase alternating current charging system, and filter unit connects three-phase alternating current system.The current disturbing source that the present invention provides can be applicable to power supply quality test system and other power quality controlling equipment Inspection fields, and its output variable voltage can be simultaneously for the power supply quality test detecting system offer current disturbing of multiple electric pressures.
Description
Technical field
The invention belongs to the service check field of distribution network var compensation and harmonic decrease devices, relate to one
Plant current disturbing source generating means, particularly relate to the current disturbing source of a kind of variable voltage level.
Background technology
Modern power systems load presents the feature of multiformity and complexity, specifically can be attributed to harmonic wave
Content big (rectifying installation), power factor low (three-phase induction motor), power swing (electric arc furnace), punching
The features such as hitting property (electric railway and urban track traffic).The load possessing these features can serious shadow
Ring the quality of power supply of current electric grid, service life of equipment can be shortened, increase grid loss, reduction finished product
Rates etc., time serious, even entail dangers to power system is properly functioning.
At present, power quality problem has been obtained for the common concern of various circles of society, substantial amounts of scientific research people
Member and enterprise throw oneself into the research of power quality controlling.Occur in that substantial amounts of power quality controlling equipment,
Having more typically: dynamic electric voltage recovery device, solid converting switch, active filter, Static Synchronous is mended
Repay device etc..In addition, other the most a lot of custom power system and devices, solve under specific operation
Power quality problem.The development of these technology, has benefited from power electronic devices and relevant control skill
The development of art.Maturation just because of this technology so that power quality controlling equipment develops rapidly also
Reach the blowout phase.
Prominent and the development of power quality controlling equipment of power quality problem and then power equipment is tested
Means propose challenge.Based on the full current disturbing generator controlling power electronic devices, can simulate all kinds of
Common distribution network electric energy quality problem, such as harmonic current, reactive current problem etc..At present, electric energy
Current disturbing source used in quality test system is essentially fixed voltage grade, and principle is all by whole
After convertor transformer and rectifier bridge rectification, another mistake becomes harmonic wave or reactive current output；Minority is multivoltage etc.
Level, is also to be accessed a transformator on the basis of above-mentioned fixed voltage grade again to come real by outlet side
Existing, whole current disturbing source cost is bigger.
Summary of the invention
Present invention aim at providing the current disturbing source of a kind of variable voltage level, solve existing electricity
The problem that energy quality test system voltage the most single grade.
For reaching object above, the present invention adopts the following technical scheme that and is achieved:
A kind of current disturbing source of variable voltage level, including charging resistor R1 being sequentially connected with and
By-pass switch KM-BP, rectifier transformer tap switching catalyst KM1, KM2...KMn,
Rectifier transformer, back-to-back power cell and filter unit；Described rectifier transformer primary side winding is many
Tap winding, rectifier transformer vice-side winding is multiple secondary winding, and each vice-side winding connects one
Power cell back-to-back, described charging resistor connects three-phase alternating current charging system, and filter unit connects three and intersects
Streaming system.
As the further preferred scheme of the present invention, described rectifier transformer is 3 single-phase transformers or 1
Platform three-phase transformer, corresponding power cell rectification side back-to-back is divided into single-phase rectifier pattern or three-phase whole
Stream mode；Power cell rectification side mutually isolated connection rectifier transformer secondary difference winding back-to-back,
When rectifier transformer is three-phase structure, its three-phase three winding is considered as 1 unit winding connection one and leans against
Back of the body power cell；Power cell intermediate dc busbar voltage back-to-back, by throwing under fixed modulation ratio
Cutting different load tap changers and carry out adjusting size, back-to-back power cell outlet side is logical after cascading mutually
Cross filter unit and connect three-phase alternating current system.
As the further preferred scheme of the present invention, when described rectifier transformer is three-phase structure, secondary around
Group is triangular structure.
As the further preferred scheme of the present invention, it is defeated that described back-to-back power cell includes being sequentially connected with
Enter inductance L1, rectifier bridge, DC side filter capacitor C1 and inversion H bridge.
As the further preferred scheme of the present invention, the rectification side of described back-to-back power cell and inverter side
All use wholly-controled device.
As the further preferred scheme of the present invention, described filter unit includes inductance L2, L3 of series connection
And the electric capacity C2 that is connected between inductance L2, L3 and zero line and resistance R3.
Compared with prior art, the method have the advantages that
(1) present invention arranges transformator in rectification side, by the many taps of switching transformator, it is achieved many
The current disturbing source of electric pressure, current disturbing source can send specifies subharmonic and specifies secondary harmonic wave group
Close and reactive current, numerical value continuously adjustabe；
(2) capacitance voltage of current disturbing source power cell intermediate DC link can regulate on a large scale, adjusts
System ratio may be designed to ideal value, so that current disturbing source can adapt to multiple voltages etc. of wide scope
The power supply quality test system of level, it is to avoid additionally install transformator additional at outlet side, reduces test system
System construction cost；
(3) current disturbing source is when adapting to different electric pressure, no matter rectification or the modulation of inverter side
Ratio may be designed to ideal value, and this avoids modulation occurs greatly than too low bringing in a switch periods
Amount burst pulse triggers the problem of signal, thus reduces inverter output ripple voltage, improves disturbance
The control accuracy of electric current；
Further, current disturbing source apparatus inverter side uses cascaded H-bridges structure, and equivalent switching frequency carries
High to 2m times of devices switch frequency (wherein, m represents every phase cascaded H-bridges unit number), current disturbing
Source can accurately export higher hamonic wave.
Accompanying drawing explanation
Fig. 1 is the current disturbing source topology diagram under three phase rectifier pattern；
Fig. 2 is the back-to-back power cell topology diagram under three phase rectifier pattern；
Fig. 3 is a kind of low-voltage electric energy quality test system diagram；
Fig. 4 is topology diagram during current disturbing source 1140V outlet
Fig. 5 is topology diagram during current disturbing source 600V/660V/690V outlet
Fig. 6 is topology diagram during current disturbing source 380V outlet
Detailed description of the invention
Describe the present invention with specific embodiment below in conjunction with the accompanying drawings:
Such as Fig. 1, the invention provides a kind of power distribution network current disturbing source with variable voltage level,
Including charging resistor R1 and by-pass switch KM-BP, rectifier transformer tap switching catalyst
KM1, KM2...KMn, rectifier transformer, back-to-back power cell and output filter unit；Described whole
Convertor transformer primary side winding is many taps winding, and rectifier transformer vice-side winding is multiple secondary winding,
Each vice-side winding connects a back-to-back power cell, and current disturbing source input connects three-phase alternating current charging
System, bus voltage value is fixed；Current disturbing source output connects three-phase variable voltage system, busbar voltage
Value is not fixed, and can be divided into several grades.
As in figure 2 it is shown, back-to-back power cell includes the input inductance L1 being sequentially connected with, rectifier bridge,
DC side filter capacitor C1 and inversion H bridge.Back-to-back power cell rectification side divide single-phase rectifier or
Three phase rectifier both of which, rectification side is separate, connects transformator difference winding respectively；Inverter side is adopted
Use cascading multiple electrical level structure, it is possible to be effectively improved the equivalent switching frequency of output.Rectification side and inversion
Side all uses wholly-controled device so that back to back structure two side converter all can realize four quadrant running.
Described output filter includes inductance L2, L3 and electric capacity C2 and resistance R3, inductance L2, L3
Series connection, electric capacity C2 and resistance R3 is connected between inductance L2, L3 and zero line.Wherein L3 and C2
Configuration can be need not when current disturbing, replace with line equivalent inductance and electric capacity.
Current disturbing source adapts to the circuit topological structure of different electric pressure as it is shown in figure 1, and the present invention
The electric parameter method for designing of closely-related capital equipment and components and parts is as follows:
First determine that the maximum voltage grade that current disturbing source is adapted to is how many, then according to this electricity
Pressure grade determines that inverter side H bridge cascades number m；H bridge cascade number determine after for disturbing source output every
Individual electric pressure suitably modulates each back-to-back power cell intermediate dc than calculating according to inverter side
The DC bus-bar voltage of link, middle dc voltage number of levels is identical with tap number n；And then
The rectification side AC-input voltage going out correspondence than Extrapolation is suitably modulated further according to rectification side, thus
Secondary voltage and the no-load voltage ratio of each tap of rectifier transformer are obtained.
The capacity of described rectifier transformer is determined by the meritorious capacity of current disturbing source；If current disturbing
Source also needs to export three-phase imbalance reactive current, then the capability value of rectifier transformer is preferably further added by one
The current disturbing source reactive capability value of individual 10%～20%.
Rectifier transformer according to optional 3 single-phase rectifier transformers of difference of power cell rectification mode or
Two kinds of structures of 1 three-phase, primary side winding is many taps winding therefore transformation to 1 three-phase structure
Its three-phase windings of device preferably connects as star-like；Vice-side winding is multiple secondary winding, and each winding connects 1
Power cell, when transformator is 1 three-phase structure, three-phase three winding is considered as 1 unit winding and connects
One back-to-back power cell；Use 1 three-phase structure time, vice-side winding preferably connect into triangle with
Just 3 times and the multiple subharmonic current of 3 that suppression rectification side is brought.
Other circuit components parameter designing, such as charging resistor R1, input inductance L1, intermediate dc
Electric capacity C1, output filter unit L2, C2, L3 etc. all by Active Power Filter-APF (APF) or
The general design method of STATCOM (STATCOM) considers, including the control of current disturbing source
System and monitoring system etc. are also that the method for designing with reference to APF, STATCOM considers.
Fig. 3 gives the current disturbing source a kind of concrete application in low-voltage electric energy quality test system.
Current disturbing source in Fig. 3 possesses any subharmonic within 50 subharmonic and reactive current generation energy
Power.Current disturbing source can multiple stage used in parallel, its total capacity is 2MVA, input charge power supply system
Voltage is 380V, and output is connect test busbar voltage grade and is respectively 380V, 600V, 660V, 690V
And 1140V.The current disturbing source of the present embodiment uses the three phase rectifier pattern shown in Fig. 1 and Fig. 2
Under topological structure, the present invention relates to the several important electrical parameter calculation in current disturbing source as follows:
1) press maximum voltage grade 1140V, choose inverter side H bridge cascade number m=2；
2) consider that 600V, 660V and 690V electric pressure is close and merge into 1 690V grade,
Therefore tap number n=middle dc voltage number of degrees=3；
3) PWM in the electric pressure of bus and power electronics is connected according to current disturbing source output
Commutator and the correlation theory of inverter, be calculated several essential electrical closely-related with the present invention
Parameter is as shown in table 1 below, have ignored during calculating rectification side input inductance L1 on pressure drop:
Table 1
Owing to inverter side its output electric current under different electric pressures is different (for ensureing that current disturbing source holds
Amount is consistent), the pressure drop on inverter side outputting inductance L2 is the most different, and its pressure drop also with the tool of L2
Body design load is closely related, and therefore the table 1 in description of the invention only gives inverter side modulation ratio
One scope.
Fig. 4, Fig. 5 and Fig. 6 sets forth the topology diagram under 5 kinds of electric pressures of the present embodiment,
Use this topology can realize three-phase 380V/600V/660V/690V/ without exporting transformator
The harmonic current of 1140V electric pressure and reactive current output.
Specific embodiment described in the present invention is only to present invention spirit explanation for example.This
Described specific embodiment can be made various amendment by bright person of ordinary skill in the field
Or supplement or use similar mode to substitute, but without departing from the spirit of the present invention or surmount appended
Scope as defined in the claims.
Claims (5)
1. the current disturbing source of a variable voltage level, it is characterized in that: include charging resistor R1 and the by-pass switch KM-BP thereof being sequentially connected with, rectifier transformer tap switching catalyst KM1, KM2...KMn, rectifier transformer, back-to-back power cell and filter unit；Described rectifier transformer primary side winding is many taps winding, and rectifier transformer vice-side winding is multiple secondary winding, and each vice-side winding connects a back-to-back power cell, and described charging resistor connects three-phase alternating current charging system, and filter unit connects three-phase alternating current system；
Described rectifier transformer is 3 single-phase transformers or 1 three-phase transformer, and corresponding power cell rectification side back-to-back is divided into single-phase rectifier pattern or three phase rectifier pattern；Power cell rectification side mutually isolated connection rectifier transformer secondary difference winding back-to-back, when rectifier transformer is three-phase structure, its three-phase three winding is considered as 1 unit winding and connects a back-to-back power cell；Power cell intermediate dc busbar voltage, carrys out adjusting size by the load tap changer that switching is different under fixed modulation ratio back-to-back, and back-to-back power cell outlet side connects three-phase alternating current system by filter unit after cascading mutually.
The current disturbing source of variable voltage level the most according to claim 1, it is characterised in that: when described rectifier transformer is three-phase structure, vice-side winding is triangular structure.
3. according to the current disturbing source of the variable voltage level described in any one of claim 1-2, it is characterised in that: described back-to-back power cell includes the input inductance L1 being sequentially connected with, rectifier bridge, DC side filter capacitor C1 and inversion H bridge.
4. according to the current disturbing source of the variable voltage level described in any one of claim 1-2, it is characterised in that: rectification side and the inverter side of described back-to-back power cell all use wholly-controled device.
5. according to the current disturbing source of the variable voltage level described in any one of claim 1-2, it is characterised in that: described filter unit includes inductance L2, L3 and the electric capacity C2 being connected between inductance L2, L3 and zero line and resistance R3 of series connection.
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| CN108292844B (en) * | 2015-11-19 | 2021-07-16 | Abb电网瑞士股份公司 | Inverter device using inverter module |
| CN106452121A (en) * | 2016-10-31 | 2017-02-22 | 北京航天斯达科技有限公司 | Adjustable excitation power supply of electric vibration table |
| CN107315112B (en) * | 2017-07-05 | 2020-02-07 | 湖南大学 | Megawatt-level broadband impedance measuring device and control method thereof |
| IT201800004847A1 (en) * | 2018-04-24 | 2019-10-24 | METHOD OF MELTING IN AN ELECTRIC ARC OVEN AND RELATED EQUIPMENT | |
| CN109193655B (en) * | 2018-08-08 | 2021-08-20 | 中冶京诚工程技术有限公司 | Flexible power supply equipment for alternating current electric arc furnace |
| CN110907740A (en) * | 2019-12-12 | 2020-03-24 | 云南电网有限责任公司临沧供电局 | Automatic commutation equipment detection device and method based on PWM converter |
| CN110995016B (en) * | 2019-12-26 | 2021-12-07 | 深圳市禾望电气股份有限公司 | Converter and wind generating set |
| CN111585498A (en) * | 2020-06-03 | 2020-08-25 | 能科科技股份有限公司 | Variable-frequency speed regulation control system with load observer and frequency converter |
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| CN102148501B (en) * | 2010-07-23 | 2014-09-10 | 中国电力科学研究院 | Disturbance generation device for wind power station |
| CN103680881B (en) * | 2013-12-18 | 2016-06-29 | 中国西电电气股份有限公司 | A kind of adjustable transformer and rank difference pressure regulation method thereof |
| CN103955141B (en) * | 2014-05-09 | 2017-12-26 | 国家电网公司 | A kind of hookup and test method of THE UPFC low pressure physical model |
| CN104034982B (en) * | 2014-06-19 | 2017-06-23 | 国家电网公司 | A kind of electric energy quality harmonic disturbs source platform |
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