CN104701868A - Variable voltage grade type current disturbance source - Google Patents
Variable voltage grade type current disturbance source Download PDFInfo
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- CN104701868A CN104701868A CN201510142046.1A CN201510142046A CN104701868A CN 104701868 A CN104701868 A CN 104701868A CN 201510142046 A CN201510142046 A CN 201510142046A CN 104701868 A CN104701868 A CN 104701868A
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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 invention provides a variable voltage grade type current disturbance source. The variable voltage grade type current disturbance source comprises a charging resistor R1, a bypass switch KM-BP of the charging resistor R1, contactors KM1, KM2...KMn for switching a rectifier transformer tapping point, a rectifier transformer, back-to-back power units and a filtering unit which are sequentially connected; a primary winding of the rectifier transformer is a multi-tapping-joint winding, and secondary windings of the rectifier transformer are of multi-winding structure; each secondary winding is connected with one back-to-back power unit; the charging resistor is connected with a three-phase AC charging system; the filtering unit is connected with a three-phase AC system. The current disturbance source can be applied to the field of detection of an electricity energy quality testing system and other electricity energy quality treatment devices, and the outputted variable voltage can synchronously provide current disturbance to the electricity energy quality testing detecting systems at a plurality of voltage grades.
Description
Technical field
The invention belongs to the service check field of distribution network var compensation and harmonic decrease devices, relate to a kind of current disturbing source generating means, particularly relate to a kind of current disturbing source of variable voltage level.
Background technology
Modern power systems load presents the feature of diversity and complexity, specifically can be summed up as harmonic content large (rectifying installation), power factor low (three-phase induction motor), the features such as power fluctuation (arc furnace), impact (electric railway and urban track traffic).The load possessing these features can have a strong impact on the quality of power supply of current electric grid, can shorten service life of equipment, increases grid loss, reduce rate of finished products etc., the normal operation of even entail dangers to electric power system time serious.
At present, power quality problem has obtained the common concern of various circles of society, and a large amount of scientific research personnel and enterprise throw oneself into the research of power quality controlling.There is a large amount of power quality controlling equipment, comparatively common are: dynamic electric voltage recovery device, solid converting switch, active filter, STATCOM etc.In addition, also have other a lot of custom power system and devices, solve the power quality problem under specific operation.The development of these technology, all has benefited from the development of power electronic device and relevant control technology.Just because of the maturation of this technology, power quality controlling equipment is developed rapidly and reaches the blowout phase.
The development of the outstanding and power quality controlling equipment of power quality problem and then challenge is proposed to power equipment means of testing.Based on the current disturbing generator of full control power electronic device, all kinds of common distribution network electric energy quality problem can be simulated, as harmonic current, reactive current problem etc.At present, current disturbing source used in power supply quality test system is fixed voltage grade substantially, and principle is all become harmonic wave or reactive current output by another mistake after rectifier transformer and rectifier bridge rectification; Minority is multi-voltage grade, is also on the basis of above-mentioned fixed voltage grade, to access a transformer again by outlet side realize, and whole current disturbing source cost is larger.
Summary of the invention
The object of the invention is the current disturbing source providing a kind of variable voltage level, solves the problem that existing power supply quality test system voltage grade is too single.
For reaching above object, the present invention takes following technical scheme to be achieved:
A current disturbing source for variable voltage level, comprises the charging resistor R1 and by-pass switch KM-BP thereof that connect successively, rectifier transformer tap switching contactor KM1, KM2...KMn, rectifier transformer, back-to-back power cell and filter unit; Described rectifier transformer former limit winding is many taps winding, and rectifier transformer vice-side winding is multiple secondary winding, and each vice-side winding connects a power cell back-to-back, and described charging resistor connects three-phase alternating current charging system, and filter unit connects three-phase alternating current system.
As the further preferred version of the present invention, described rectifier transformer is 3 single-phase transformers or 1 three-phase transformer, and power cell rectification side is divided into single-phase rectifier pattern or three phase rectifier pattern back-to-back accordingly; The different winding of power cell rectification side mutually isolated connection rectifier transformer secondary back-to-back, when rectifier transformer is three-phase structure, its three-phase three winding is considered as 1 unit winding switching one power cell back-to-back; Power cell intermediate dc busbar voltage back-to-back, carrys out adjusting size by the load tap changer that switching is different under fixed modulation ratio, connects three-phase alternating current system back-to-back after the every phase cascade of power cell outlet side by filter unit.
As the further preferred version of the present invention, when described rectifier transformer is three-phase structure, vice-side winding is triangular structure.
As the further preferred version of the present invention, described power cell back-to-back comprises the input inductance L 1 connected successively, rectifier bridge, DC side filter capacitor C1 and inversion H bridge.
As the further preferred version of the present invention, rectification side and the inverter side of described power cell back-to-back all adopt wholly-controled device.
As the further preferred version of the present invention, described filter unit comprises the inductance L 2 of series connection, L3 and is connected to inductance L 2, electric capacity C2 between L3 and zero line and resistance R3.
Compared with prior art, the present invention has following beneficial effect:
(1) the present invention arranges transformer in rectification side, by the many taps of switching transformer, realizes the current disturbing source of multi-voltage grade, and current disturbing source can send specifies subharmonic and specifies secondary harmonic combinations 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, modulation ratio can be designed to ideal value, thus make current disturbing source can adapt to the power supply quality test system of multiple electric pressures of wide region, avoid and install transformer additional in addition at outlet side, reduce pilot system construction cost;
(3) current disturbing source is when adapting to different electric pressure, no matter rectification or the modulation ratio of inverter side can be designed to ideal value, which avoid that modulation ratio is too low brings the problem occurring a large amount of burst pulse triggering signal in a switch periods, thus reduce inverter output ripple voltage, improve the control precision of current perturbation;
Further, current disturbing source apparatus inverter side adopts cascaded H-bridges structure, and equivalent switching frequency brings up to 2m times of devices switch frequency (wherein, m represents every phase cascaded H-bridges unit number), and current disturbing source accurately can export high order harmonic component.
Accompanying drawing explanation
Fig. 1 is the current disturbing source topology diagram under three phase rectifier pattern;
Fig. 2 is the topology diagram of power cell back-to-back under three phase rectifier pattern;
Fig. 3 is a kind of low-voltage electric energy quality test system diagram;
Topology diagram when Fig. 4 is current disturbing source 1140V outlet
Topology diagram when Fig. 5 is current disturbing source 600V/660V/690V outlet
Topology diagram when Fig. 6 is current disturbing source 380V outlet
Embodiment
Describe the present invention below in conjunction with the drawings and specific embodiments:
As Fig. 1, the invention provides a kind of power distribution network current disturbing source with variable voltage level, comprise charging resistor R1 and by-pass switch KM-BP, rectifier transformer tap switching contactor KM1, KM2...KMn, rectifier transformer, back-to-back power cell and output filtering unit; Described rectifier transformer former limit winding is many taps winding, and rectifier transformer vice-side winding is multiple secondary winding, and each vice-side winding connects a power cell back-to-back, and current disturbing source input connects three-phase alternating current charging system, and bus voltage value is fixed; Current disturbing source exports and connects three-phase variable voltage system, and bus voltage value is not fixed, and can be divided into several grades.
As shown in Figure 2, power cell comprises the input inductance L 1 connected successively back-to-back, rectifier bridge, DC side filter capacitor C1 and inversion H bridge.Power cell rectification side divides single-phase rectifier or three phase rectifier two kinds of patterns back-to-back, and rectification side is separate, connects the different winding of transformer respectively; Inverter side adopts cascading multiple electrical level structure, effectively can improve the equivalent switching frequency of output.Rectification side and inverter side all adopt wholly-controled device, make back to back structure two side converter all can realize four quadrant running.
Described output filter comprises inductance L 2, L3 and electric capacity C2 and resistance R3, and inductance L 2, L3 connect, and electric capacity C2 and resistance R3 is connected to inductance L 2, between L3 and zero line.Wherein L3 and C2 can not need configuration when current disturbing, replaces with line equivalent inductance and electric capacity.
Current disturbing source adapts to the circuit topological structure of different electric pressure as shown in Figure 1, as follows with the electric parameter method for designing of the closely-related capital equipment of the present invention and components and parts:
First be determine that the maximum voltage grade that current disturbing source adapts to is how many, then according to this electric pressure determination inverter side H bridge cascade number m; Each electric pressure that H bridge cascade number exports for disturbing source after determining is according to the suitable modulation ratio of inverter side to calculate the DC bus-bar voltage of each intermediate DC link of power cell back-to-back, and middle dc voltage number of levels is identical with tap number n; And then go out corresponding rectification side AC-input voltage according to the modulation ratio Extrapolation that rectification side is suitable again, thus obtain the secondary voltage of rectifier transformer and the no-load voltage ratio of each tap.
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 preferably increases the current disturbing source reactive capability value of 10% ~ 20% again.
Rectifier transformer is according to optional 3 single-phase rectifier transformers of the difference of power cell rectification mode or 1 three-phase, two kinds of structures, and former limit winding is many taps winding therefore preferably connects as star-like to its three-phase windings of transformer of 1 three-phase structure; Vice-side winding is multiple secondary winding, each winding switching 1 power cell, and when transformer is 1 three-phase structure, three-phase three winding is considered as 1 unit winding switching one power cell back-to-back; Adopt 1 three-phase structure time, vice-side winding preferably connect as triangle so as suppress rectification side to be brought 3 times and 3 multiple subharmonic current.
Other circuit components parameter designing, as charging resistor R1, input inductance L 1, intermediate dc electric capacity C1, output filter unit L2, C2, L3 etc. all consider by the general design method of Active Power Filter-APF (APF) or STATCOM (STATCOM), and the control and supervisory control system etc. that comprise current disturbing source are also consider with reference to the method for designing of APF, STATCOM.
Fig. 3 gives a kind of embody rule of current disturbing source in low-voltage electric energy quality test system.Current disturbing source in Fig. 3 possesses any subharmonic within 50 subharmonic and reactive current generating ability.Current disturbing source can use in multiple stage parallel connection, and its total capacity is 2MVA, and input charge power supply system voltage is 380V, exports connect test busbar voltage grade and is respectively 380V, 600V, 660V, 690V and 1140V.The current disturbing source of the present embodiment adopts the topological structure under the three phase rectifier pattern shown in Fig. 1 and Fig. 2, and the several important electrical parameter calculation that the present invention relates in current disturbing source is as follows:
1) by maximum voltage grade 1140V, inverter side H bridge cascade number m=2 is chosen;
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) correlation theory of PWM rectifier in the electric pressure of connection bus and power electronics and inverter is exported according to current disturbing source, calculate closely-related several main electrical parameters with the present invention as shown in table 1 below, in computational process, have ignored the pressure drop in rectification side input inductance L 1:
Table 1
Due to inverter side its output current difference (consistent for ensureing current disturbing source capacity) under different electric pressure, pressure drop on inverter side outputting inductance L2 is also different, and its pressure drop is also worth closely related with the specific design of L2, the table 1 therefore in specification of the present invention only gives a scope of inverter side modulation ratio.
Fig. 4, Fig. 5 and Fig. 6 sets forth the topology diagram under the present embodiment 5 kinds of electric pressures, adopt this topology can realize harmonic current and the reactive current output of three-phase 380V/600V/660V/690V/1140V electric pressure without the need to output transformer.
Specific embodiment described in the present invention is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (6)
1. the current disturbing source of a variable voltage level, it is characterized in that: comprise the charging resistor R1 and by-pass switch KM-BP thereof that connect successively, rectifier transformer tap switching contactor KM1, KM2...KMn, rectifier transformer, back-to-back power cell and filter unit; Described rectifier transformer former limit winding is many taps winding, and rectifier transformer vice-side winding is multiple secondary winding, and each vice-side winding connects a power cell back-to-back, and described charging resistor connects three-phase alternating current charging system, and filter unit connects three-phase alternating current system.
2. the current disturbing source of variable voltage level according to claim 1, it is characterized in that: described rectifier transformer is 3 single-phase transformers or 1 three-phase transformer, and power cell rectification side is divided into single-phase rectifier pattern or three phase rectifier pattern back-to-back accordingly; The different winding of power cell rectification side mutually isolated connection rectifier transformer secondary back-to-back, when rectifier transformer is three-phase structure, its three-phase three winding is considered as 1 unit winding switching one power cell back-to-back; Power cell intermediate dc busbar voltage back-to-back, carrys out adjusting size by the load tap changer that switching is different under fixed modulation ratio, connects three-phase alternating current system back-to-back after the every phase cascade of power cell outlet side by filter unit.
3. the current disturbing source of variable voltage level according to claim 2, is characterized in that: when described rectifier transformer is three-phase structure, and vice-side winding is triangular structure.
4. the current disturbing source of the variable voltage level according to any one of claim 1-3, is characterized in that: described power cell back-to-back comprises the input inductance L 1 connected successively, rectifier bridge, DC side filter capacitor C1 and inversion H bridge.
5. the current disturbing source of the variable voltage level according to any one of claim 1-3, is characterized in that: rectification side and the inverter side of described power cell back-to-back all adopt wholly-controled device.
6. the current disturbing source of the variable voltage level according to any one of claim 1-3, is characterized in that: described filter unit comprises the inductance L 2 of series connection, L3 and is connected to inductance L 2, electric capacity C2 between L3 and zero line and resistance R3.
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| CN201510142046.1A CN104701868B (en) | 2015-03-27 | 2015-03-27 | A kind of current disturbing source of variable voltage level |
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| CN201510142046.1A CN104701868B (en) | 2015-03-27 | 2015-03-27 | A kind of current disturbing source of variable voltage level |
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Cited By (8)
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| 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 |
| CN107315112A (en) * | 2017-07-05 | 2017-11-03 | 湖南大学 | A kind of MW class wide-band impedance measurement apparatus and its control method |
| CN108292844A (en) * | 2015-11-19 | 2018-07-17 | Abb瑞士股份有限公司 | Use the converter device of current changer module |
| CN109193655A (en) * | 2018-08-08 | 2019-01-11 | 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 |
| CN110995016A (en) * | 2019-12-26 | 2020-04-10 | 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 |
| CN112219081A (en) * | 2018-04-24 | 2021-01-12 | 达涅利机械设备股份公司 | Melting method in an electric arc furnace and corresponding device |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108292844A (en) * | 2015-11-19 | 2018-07-17 | Abb瑞士股份有限公司 | Use the converter device of current changer module |
| CN108292844B (en) * | 2015-11-19 | 2021-07-16 | Abb电网瑞士股份公司 | Inverter device using inverter module |
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| CN107315112A (en) * | 2017-07-05 | 2017-11-03 | 湖南大学 | A kind of MW class wide-band impedance measurement apparatus and its control method |
| CN107315112B (en) * | 2017-07-05 | 2020-02-07 | 湖南大学 | Megawatt-level broadband impedance measuring device and control method thereof |
| CN112219081A (en) * | 2018-04-24 | 2021-01-12 | 达涅利机械设备股份公司 | Melting method in an electric arc furnace and corresponding device |
| CN112219081B (en) * | 2018-04-24 | 2021-10-26 | 达涅利机械设备股份公司 | Melting method in an electric arc furnace and corresponding device |
| CN109193655A (en) * | 2018-08-08 | 2019-01-11 | 中冶京诚工程技术有限公司 | Flexible power supply equipment for alternating current electric arc furnace |
| 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 |
| CN110995016A (en) * | 2019-12-26 | 2020-04-10 | 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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