CN102624003A - Bidirectional PWM (pulse-width modulation) chopped-mode dynamic reactive power compensation device - Google Patents
Bidirectional PWM (pulse-width modulation) chopped-mode dynamic reactive power compensation device Download PDFInfo
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- CN102624003A CN102624003A CN2012100221113A CN201210022111A CN102624003A CN 102624003 A CN102624003 A CN 102624003A CN 2012100221113 A CN2012100221113 A CN 2012100221113A CN 201210022111 A CN201210022111 A CN 201210022111A CN 102624003 A CN102624003 A CN 102624003A
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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 bidirectional PWM (pulse-width modulation) chopped-mode dynamic reactive power compensation device, which belongs to equipment in the technical field of power quality control of electric power systems. The bidirectional PWM chopped-mode dynamic reactive power compensation device is characterized in that bidirectional PWM chopped capacitors (4A, 4B and 4C) are connected onto a three-phase four-wire power grid, and capacitive reactive power is continuously adjusted from zero to the maximum range by means of adjusting the duty ratios of power switches of the bidirectional PWM chopped capacitors (4A, 4B and 4C). The bidirectional PWM chopped-mode dynamic reactive power compensation device has the advantages that a follow current power switch, a filter and a transformer for an isolation power switch and a fixed compensation capacitor are omitted as compared with an existing chopped-mode dynamic reactive power compensation device, the functions of harmonic wave self-filtering for self-smoothing chopped voltage, power grid harmonic wave filtering and high voltage isolation are added, and the dynamic reactive power compensation device is higher in cost performance and smaller in size.
Description
Technical field
The present invention relates to the equipment of Electrical Power System Dynamic compensating power, be specifically related to a kind of two-way PWM chopped mode dynamic reactive compensation device.
Background technology
It is most important for the economic and reliable operation of the quality of power supply of improving electric power system, reduction line loss, reduction transformer copper loss and raising electrical network that the dynamic compensation perception is idle; Three kinds of dynamic reactive compensation devices of extensive use at present; Thyristor switchable capacitor (TSC), thyristor regulate reactor (TCR) and reacance generator (STATCOM) all in various degree exist the cost height, volume is big and problem such as spontaneous harmonic wave.To this; Chen Lezhu, Wang Wei, look into " chopped mode Reactive Compensation Device " patent (Granted publication number: CN 202034781 U of all, Ge Yijun invention; Patent of invention is applied in same innovation and creation on the same day) reduced cost, volume and the spontaneous harmonic wave of dynamic reactive compensation device to a certain extent; But owing to adopt the AC voltage regulator of two-way PWM chopping switch, filter and isolating transformer structure in " chopped mode Reactive Compensation Device "; Cause three defectives: (1) has increased cost and has taken up an area of the space for discharging the afterflow chopping switch (VMOS or IGBT) that the energy of isolating transformer inductance when chopping switch ends increases; (2) because of the spontaneous harmonic wave of copped wave isolating transformer, must use the filter filtering, increase cost thus and taken up an area of the space; (3) because of at a distance from power switch and the ad hoc isolating transformer of being electrically connected of compensation condenser, not only increased cost, and can not isolated high voltage.
Summary of the invention
Technical problem:The technical problem that the present invention will solve is, solves that the dynamic reactive compensation device cost is high, volume is big and technical barrier such as spontaneous harmonic wave, and the dynamic reactive compensation device of high performance-price ratio is provided.
Technical scheme:A kind of two-way PWM chopped mode dynamic reactive compensation device of the present invention, the binomial that proposes to belong to the total inventive concept technical scheme that is mutually related when being used for the low voltage electric network dynamic passive compensation, promptly can adopt scheme one, also can adopt scheme two; When being used for the high-voltage fence dynamic passive compensation, employing scheme two.First a kind of two-way PWM chopped mode dynamic reactive compensation device scheme is connected the duty ratio of power switch in three the two-way PWM copped wave electric capacity (4A, 4B, 4C) on the electrical network through adjusting, realize from zero regulate capacitive reactive power to the maximum magnitude continuously, from level and smooth chopping voltage from filtering harmonic with have three purposes such as filtering mains by harmonics concurrently.Second a kind of two-way PWM chopped mode dynamic reactive compensation device set up the duty ratio of power switch in the isolating transformer scheme is connected three isolating transformers (3A, 3B, 3C) secondary side through adjusting three two-way PWM copped wave electric capacity (4A, 4B, 4C), realize from zero to the maximum magnitude continuous adjusting isolating transformer primary side capacitive reactive power, from level and smooth chopping voltage from filtering harmonic, isolated high voltage with have four purposes such as filtering mains by harmonics concurrently.
First a kind of two-way PWM chopped mode dynamic reactive compensation device scheme; The every phase output terminal that it is characterized in that three-phase four-wire power 1 respectively with corresponding being connected of input of perceptual load or burden without work 2; Every phase one end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) respectively with the A of corresponding three-phase four-wire system power supply 1 mutually, B phase, C be connected, every phase other end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) all is connected with the N line.
Second a kind of two-way PWM chopped mode dynamic reactive compensation device set up the isolating transformer scheme; The every phase output terminal that it is characterized in that three-phase four-wire power 1 respectively with corresponding being connected of input of perceptual load or burden without work 2; Every phase one end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) is connected with every end mutually of corresponding three isolating transformers (3A, 3B, 3C) secondary side respectively; Every phase other end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) is connected with every other end mutually of corresponding three isolating transformers (3A, 3B, 3C) secondary side respectively; Every phase one end of said three isolating transformers (3A, 3B, 3C) primary side respectively with the A of corresponding three-phase four-wire system power supply 1 mutually, B phase, C be connected, every phase other end of three isolating transformers (3A, 3B, 3C) primary side all is connected with the N line.
It is identical that a kind of two-way PWM chopped mode dynamic reactive compensation device of the present invention and a kind of two-way PWM chopped mode dynamic reactive compensation device are set up the structure of three the two-way PWM copped wave electric capacity (4A, 4B, 4C) that use in the isolating transformer, and two kinds of technical schemes are arranged.
1) about two-way PWM copped wave electric capacity scheme one---the two-way PWM copped wave of rectification type electric capacity (4A, 4B, 4C).It is characterized in that chopping switch is by a power switch pipe (VMOS or IGBT)
V 1, a rectifier bridge
D 1With a building-out capacitor
C 1 Form power switch pipe
V 1Source electrode (D) and rectifier bridge
D 1DC1+ end be connected power switch pipe
V 1 Drain electrode (S) and rectifier bridge
D 1DC1-end be connected rectifier bridge
D 1AC1 end be an end of the two-way PWM copped wave of rectification type electric capacity, rectifier bridge
D 1AC2 end and compensation condenser
C 1 One end is connected, compensation condenser
C 1 The other end is the other end of the two-way PWM copped wave of rectification type electric capacity (4A, 4B, 4C).
2), it is characterized in that the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C) is by two power switch pipes about two-way PWM copped wave electric capacity scheme two---the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C)
V 1 ,
V 2 Form power switch pipe with a building-out capacitor
V 1 Drain electrode (D) and power switch pipe
V 2 Drain electrode (D) be connected power switch pipe
V 1 Source electrode (S) be an end of the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C), power switch pipe
V 2 Source electrode (S) and compensation condenser
C 1 One end is connected, compensation condenser
C 1 The other end is the other end of the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C).
Beneficial effect:
A kind of two-way PWM chopped mode dynamic reactive compensation device of the present invention is compared with existing reactive power compensator, has the following advantages:
1) two-way PWM copped wave electric capacity (4A, 4B, 4C) does not need the afterflow chopping switch, has saved the cost and the volume of afterflow chopping switch thus;
2) two-way PWM copped wave electric capacity (4A, 4B, 4C) has from level and smooth chopping voltage, from the function of filtering harmonic, does not need filter, has saved the cost and the volume of filter thus;
3) two-way PWM copped wave electric capacity (4A, 4B, 4C) does not need the isolating transformer between isolated power switch and the compensation condenser, has saved the cost and the volume of isolating transformer thus;
4) two-way PWM copped wave electric capacity (4A, 4B, 4C) has the function of administering mains by harmonics concurrently;
5) two-way as required PWM copped wave electric capacity (4A, 4B, 4C) can be selected for use and isolate or the not electrical connection of isolated high voltage.
Description of drawings:
Fig. 1 is the two-way PWM chopped mode of a present invention dynamic reactive compensation device schematic diagram;
Fig. 2 sets up the isolating transformer schematic diagram for the two-way PWM chopped mode of the present invention dynamic reactive compensation device;
Fig. 3 is the two-way PWM copped wave of rectification type capacitance principle figure;
Fig. 4 is the two-way PWM copped wave of tandem type capacitance principle figure.
Among the figure: three-phase four-wire power 1, perceptual load or burden without work 2, isolating transformer (3A, 3B, 3C), two-way PWM copped wave electric capacity (4A, 4B, 4C), fixed compensation capacitor device C
1, power switch pipe V
1, power switch pipe V
2, rectifier bridge D
1, rectifier bridge D
1Ac input end AC1.Rectifier bridge D
1Ac input end AC2, rectifier bridge D
1Direct current output cathode DC1+, rectifier bridge D
1Direct current output negative pole DC1-.
Embodiment:
Specify the embodiment of two technical schemes with reference to accompanying drawing.
1) a kind of two-way PWM chopped mode dynamic reactive compensation device scheme implementation example.Can know by Fig. 1; The two-way PWM chopped mode of the present invention dynamic reactive compensation device; By every phase output terminal of three-phase four-wire power 1 respectively with corresponding being connected of input of perceptual load or burden without work 2; Every phase one end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) respectively with the A of corresponding three-phase four-wire system power supply 1 mutually, B phase, C be connected, every phase other end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) all is connected with the N line.
2) a kind of two-way PWM chopped mode dynamic reactive compensation device is set up isolating transformer scheme implementation example.Can know by Fig. 2; The two-way PWM chopped mode of the present invention dynamic reactive compensation device is set up isolating transformer; By every phase output terminal of three-phase four-wire power 1 respectively with corresponding being connected of input of perceptual load or burden without work 2; Every phase one end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) is connected with every end mutually of corresponding three isolating transformers (3A, 3B, 3C) secondary side respectively; Every phase other end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) is connected with every other end mutually of corresponding three isolating transformers (3A, 3B, 3C) secondary side respectively; Every phase one end of said three isolating transformers (3A, 3B, 3C) primary side respectively with the A of corresponding three-phase four-wire system power supply 1 mutually, B phase, C be connected, every phase other end of three isolating transformers (3A, 3B, 3C) primary side all is connected with the N line.
It is identical that a kind of two-way PWM chopped mode dynamic reactive compensation device of the present invention and a kind of two-way PWM chopped mode dynamic reactive compensation device are set up the structure of three the two-way PWM copped wave electric capacity (4A, 4B, 4C) that use in the isolating transformer; Two kinds of technical scheme embodiment are arranged, two kinds of technical scheme embodiment are described with reference to Fig. 3, Fig. 4.
1) the two-way PWM copped wave of rectification type electric capacity embodiment.Can know the two-way PWM copped wave of rectification type electric capacity (4A, 4B, 4C) by Fig. 3.It is characterized in that chopping switch is by a power switch pipe (VMOS or IGBT)
V 1, a rectifier bridge
D 1With a building-out capacitor
C 1 Form power switch pipe
V 1Source electrode (D) and rectifier bridge
D 1DC1+ end be connected power switch pipe
V 1 Drain electrode (S) and rectifier bridge
D 1DC1-end be connected rectifier bridge
D 1AC1 end be an end of the two-way PWM copped wave of rectification type electric capacity, rectifier bridge
D 1AC2 end and compensation condenser
C 1 One end is connected, compensation condenser
C 1 The other end is the other end of the two-way PWM copped wave of rectification type electric capacity (4A, 4B, 4C).
2) the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C) embodiment.Can know that by Fig. 4 the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C) is by two power switch pipes
V 1 ,
V 2 Form power switch pipe with a building-out capacitor
V 1 Drain electrode (D) and power switch pipe
V 2 Drain electrode (D) be connected power switch pipe
V 1 Source electrode (S) be an end of the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C), power switch pipe
V 2 Source electrode (S) and compensation condenser
C 1 One end is connected, compensation condenser
C 1 The other end is the other end of the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C).
Claims (4)
1. a kind of two-way PWM chopped mode dynamic reactive compensation device scheme of the present invention; The every phase output terminal that it is characterized in that three-phase four-wire power 1 respectively with corresponding being connected of input of perceptual load or burden without work 2; Every phase one end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) respectively with the A of corresponding three-phase four-wire system power supply 1 mutually, B phase, C be connected, every phase other end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) all is connected with the N line.
2. a kind of two-way PWM chopped mode dynamic reactive compensation device of the present invention is set up the isolating transformer scheme; The every phase output terminal that it is characterized in that three-phase four-wire power 1 respectively with corresponding being connected of input of perceptual load or burden without work 2; Every phase one end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) is connected with every end mutually of corresponding three isolating transformers (3A, 3B, 3C) secondary side respectively; Every phase other end of three two-way PWM copped wave electric capacity (4A, 4B, 4C) is connected with every other end mutually of corresponding three isolating transformers (3A, 3B, 3C) secondary side respectively; Every phase one end of said three isolating transformers (3A, 3B, 3C) primary side respectively with the A of corresponding three-phase four-wire system power supply 1 mutually, B phase, C be connected, every phase other end of three isolating transformers (3A, 3B, 3C) primary side all is connected with the N line.
3. the two-way PWM copped wave electric capacity that uses in claim 1 of the present invention and the claim 2 belongs to the two-way PWM copped wave of rectification type electric capacity (4A, 4B, 4C), it is characterized in that the two-way PWM copped wave of rectification type electric capacity is by a power switch pipe (VMOS or IGBT)
V 1 , a rectifier bridge
D1Form power switch pipe with a building-out capacitor
V 1 Source electrode (D) and rectifier bridge
D 1 Positive pole (+) be connected power switch pipe
V 1 Drain electrode (S) and rectifier bridge
D 1 Negative pole (-) be connected rectifier bridge
D 1 AC1 end be an end of the two-way PWM copped wave of rectification type electric capacity, rectifier bridge
D 1 AC2 end and compensation condenser
C 1 One end is connected, compensation condenser
C 1 The other end is the other end of the two-way PWM copped wave of rectification type electric capacity.
4. the two-way PWM copped wave electric capacity that uses in claim 1 of the present invention and the claim 2 belongs to the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C), it is characterized in that the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C) is by two power switch pipes
V 1 ,
V 2 Form power switch pipe with a building-out capacitor
V 1 Drain electrode (D) and power switch pipe
V 2 Drain electrode (D) be connected power switch pipe
V 1 Source electrode (S) be an end of the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C), power switch pipe
V 2 Source electrode (S) and compensation condenser
C 1 One end is connected, compensation condenser
C 1 The other end is the other end of the two-way PWM copped wave of tandem type electric capacity (4A, 4B, 4C).
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| CN2012100221113A CN102624003A (en) | 2012-02-01 | 2012-02-01 | Bidirectional PWM (pulse-width modulation) chopped-mode dynamic reactive power compensation device |
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| CN2012100221113A CN102624003A (en) | 2012-02-01 | 2012-02-01 | Bidirectional PWM (pulse-width modulation) chopped-mode dynamic reactive power compensation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647289A (en) * | 2013-12-20 | 2014-03-19 | 淄博康润电气有限公司 | Capacitance-continuously-adjustable power capacitor control method and device |
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- 2012-02-01 CN CN2012100221113A patent/CN102624003A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647289A (en) * | 2013-12-20 | 2014-03-19 | 淄博康润电气有限公司 | Capacitance-continuously-adjustable power capacitor control method and device |
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Application publication date: 20120801 |