CN103441528A - Converter topological structure for doubly-fed wind generating set - Google Patents
Converter topological structure for doubly-fed wind generating set Download PDFInfo
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- CN103441528A CN103441528A CN2013103570534A CN201310357053A CN103441528A CN 103441528 A CN103441528 A CN 103441528A CN 2013103570534 A CN2013103570534 A CN 2013103570534A CN 201310357053 A CN201310357053 A CN 201310357053A CN 103441528 A CN103441528 A CN 103441528A
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention discloses a converter topological structure for a doubly-fed wind generating set. The converter topological structure comprises a high-voltage direct-current power grid, a double-direction direct-current voltage boost converter, a rotor side converter, a stator side converter, and a doubly-fed wind generator, wherein one end of the double-direction direct-current boost converter is connected with the high-voltage direct-current power grid, the other end of the double-direction direct-current boost converter is divided into two parallel branches, one branch is connected with the direct current input end of the rotor side converter, the alternating current output end of the rotor side converter is connected with a rotor of the doubly-fed wind generator and provides exciting currents for the rotor of the doubly-fed wind generator, the other branch is connected with the direct current output end of the stator side converter, and the alternating input end of the stator side converter is connected with a stator of the doubly-fed wind generator so as to form a closed circuit. The double-direction direct-current boost converter is used for replacing a power frequency boost transformer and a box-type transformer substation, so that the converter topological structure occupies a small area and is low in cost, and direct current interconnection control is easy. The converter topological structure is especially suitable for the development of offshore wind power.
Description
Technical field
This belongs to technical field of wind power generation, relates to a kind of converter system, relates in particular to a kind of double feed wind power generator group converter topologies.
Background technology
Current MW class wind turbine group is generally exported 690V50Hz by stator and is converged grid-connected to exchanging bus after the step-up transformer in being contained in box-type substation boosts, realize being connected of rotor and stator and large electrical network simultaneously by the ac-dc-ac inverter device with transformer, realized the transmitted in both directions of rotor-side energy.Its shortcoming is: the alternating voltage output level is low, needs duplex frequency boostering transformer, box-type substation, and floor space is large, and cost is high, and exchanges comparatively difficulty of grid-connected control, is especially restricting the development of offshore wind farm.
Summary of the invention
For above-mentioned defect or deficiency, a kind of double feed wind power generator group converter topologies is proposed, realized the MW class wind turbine group converter topologies without duplex frequency boostering transformer, box-type substation, this topological structure has been simplified the ac-dc-ac inverter of the formula back-to-back device structure of fan rotor side simultaneously.
For reaching above purpose, technical scheme of the present invention is:
Comprise high-voltage direct current power grid, bidirectional, dc booster converter, rotor-side converter, stator side current transformer and double feed wind power generator, wherein, one end of bidirectional, dc booster converter is connected with high-voltage direct current power grid, the other end of bidirectional, dc booster converter is divided into two parallel branches: a branch road is connected with the direct-flow input end of rotor-side converter, the ac output end of rotor-side converter is connected with the rotor of double feed wind power generator, for the double feed wind power generator rotor provides exciting current; Another branch road is connected with the DC output end of stator side current transformer, and the ac input end of stator side current transformer is connected with the stator of double feed wind power generator, forms closed-loop path.
Described bidirectional, dc booster converter is the bridge DC-AC-DC structure of enjoying a double blessing with interstage exchange link structure.
Isolated form high frequency or the intermediate frequency transformer of the interstage exchange link structure of described bidirectional, dc booster converter for for voltage, isolating, boost.
Described stator side current transformer is for reducing the three-phase full-bridge controlled rectifier of wind energy conversion system stator side current harmonics, constant wind machine stator outlet side alternating current voltage frequency and amplitude.
Described three-phase full-bridge controlled rectifier is chopper-control rectification circuit or phase control type rectification circuit.
Described rotor-side converter adopts the three-phase bridge type converter structure.
Compared with prior art, beneficial effect of the present invention is:
In the present invention when blower fan brings into operation, it is three-phase alternating current that rotor-side converter is received power conversion from the low-voltage direct side draught of two-way DC converter, rotor to wind energy conversion system carries out excitation, controls electric current and the voltage same-phase of stator output, realizes the correction of power factor; After the stator work of double feed wind power generator, the stator of double feed wind power generator becomes direct current by the stator side current transformer by the AC rectification of double feed wind power generator output, and boosted by two-way DC converter, direct current is risen to high direct voltage, and it is grid-connected to carry out direct current.In the present invention, blower fan converter system topological structure replaces duplex frequency boostering transformer, box-type substation by the bidirectional, dc booster converter, floor space is little, cost is low, the grid-connected control of direct current is easy, be particularly suitable for the development of offshore wind farm, the ac-dc-ac inverter device of the rotor-side converter of traditional double-feedback aerogenerator is simplified simultaneously, saved device, cost is low.
The accompanying drawing explanation
Fig. 1 is the topological structure schematic diagram of chopper-control rectification circuit in the present invention;
Fig. 2 is the topological structure schematic diagram of phase control type rectification circuit in the present invention.
In figure, 1 is the stator side current transformer, and 2 is rotor-side converter, and 3 is the bidirectional, dc booster converter, 4 stators that are double feed wind power generator, and 5 is the double feed wind power generator rotor.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
Shown in Figure 1, the invention provides a kind of double feed wind power generator group converter topologies, comprise high-voltage direct current power grid 6, bidirectional, dc booster converter 3, rotor-side converter 2, stator side current transformer 1, and double feed wind power generator, wherein, one end of bidirectional, dc booster converter 3 is connected with high-voltage direct current power grid 6, the other end of bidirectional, dc booster converter 3 is divided into two parallel branches: a branch road is connected with the direct-flow input end of rotor-side converter 2, the ac output end of rotor-side converter 2 is connected with the rotor of double feed wind power generator 5, for double feed wind power generator rotor 5 provides exciting current, another branch road is connected with the DC output end of stator side current transformer 1, and the ac input end of stator side current transformer 1 is connected with the stator of double feed wind power generator 4, forms closed-loop path.
Concrete, bidirectional, dc booster converter 3 in the present invention is for having the bridge DC-AC-DC structure of enjoying a double blessing of interstage exchange link, isolated form high frequency or the intermediate frequency transformer of described bidirectional, dc booster converter 3 for for voltage, isolating, boost, the bidirectional, dc booster converter has the function of constant wind pusher side direct voltage.Described bidirectional, dc booster converter has the function of bidirectional electric energy transmission, and before fan starting, electrical network to the low-voltage direct side, provides rotor excitation current by energy feedback.
Described stator side current transformer 1 is for reducing the three-phase full-bridge controlled rectifier of wind energy conversion system stator side current harmonics, constant wind machine stator outlet side alternating current voltage frequency and amplitude, concrete, this three-phase full-bridge controlled rectifier is chopper-control rectification circuit or phase control type rectification circuit, stator side current transformer 1 is the chopper-control rectification circuit, shown in Figure 1, stator side current transformer 1 is the phase control type rectification circuit, shown in Figure 2.In the present invention, stator side current transformer 1 has the function that realizes blower fan stator side output AC electric rectification, but does not realize that stator output is meritorious, the function of Reactive Power Control.
Described rotor-side converter 2 is realized the control to wind turbine generator active power of output and reactive power by the exciting current of controlling rotor-side, described rotor-side converter 2 adopts the three-phase bridge type converter structure, and the ac-dc-ac inverter device of original blower fan pusher side is simplified.
The course of work of the present invention is:
The input dc power of high-voltage direct current power grid 6 outputs is transferred to the input of rotor-side converter 2 by bidirectional, dc booster converter 3, after rotor-side converter 2 is converted to the input AC electricity by input dc power, be input in double feed wind power generator rotor 5 and carry out excitation, so that the stator of double feed wind power generator 4 produces the output AC electricity, after stator side current transformer 1 is converted to the output direct current by the output AC electricity, be transferred to high-voltage direct current power grid 6 by bidirectional, dc booster converter 3, form loop.
When blower fan brings into operation, it is three-phase alternating current that rotor-side converter 2 is received power conversion from the low-voltage direct side draught of 1150V, double feed wind power generator rotor 5 is carried out to excitation, control electric current and the voltage same-phase of stator 4 outputs of double feed wind power generator, realize the correction of power factor; The voltage magnitude that stator side current transformer 1 is controlled its AC simultaneously is 690V, frequency is 50Hz, and the three-phase alternating current of the stator 4 of double feed wind power generator output is rectified into to the direct current of 1150V, finally by two-way DC converter 3, boosted to 10kV and carried out high direct voltage grid-connected.Shown in the function of concrete each several part is achieved as follows:
Described stator side current transformer 1 is three-phase full-bridge controlled rectifier, major function is to control amplitude and the frequency of double-fed blower fan alternating voltage, provide a stable alternating voltage to guarantee the control effect of rotor-side converter to stator side power, adopt all controlled rectifier circuit to carry out rectification to the three-phase alternating current of stator side simultaneously, thereby reduced the ac-side current harmonic content, further reduce the generator loss, improved system effectiveness.
Described rotor-side converter 2, major function is by providing rotor excitation current to realize that the meritorious of aerogenerator stator side output reaches and idle control, can control wind-driven generator and run on the unity power factor state.According to the speed conditions of wind energy conversion system, realize the two-way flow of rotor-side energy simultaneously, when the wind energy conversion system rotating speed is too fast, can be by the energy back of rotor-side to DC side; When the wind energy conversion system rotating speed is slow, the energy of DC side can be offered to rotor-side, rotor excitation current is provided.
Described bidirectional, dc booster converter 3 has the bridge DC-AC-DC structure of enjoying a double blessing of interstage exchange link, adopt isolated form high frequency or intermediate frequency transformer in this structure, realize that voltage is isolated, boosted, the function of bidirectional electric energy transmission, can realize the function of the DC voltage stability of stator side current transformer 1 output simultaneously by controlling this bidirectional, dc booster converter.Before fan starting, the energy of high voltage dc bus is passed to low-pressure side, rotor excitation current is provided.
Claims (6)
1. a double feed wind power generator group converter topologies, it is characterized in that: comprise high-voltage direct current power grid (6), bidirectional, dc booster converter (3), rotor-side converter (2), stator side current transformer (1), and double feed wind power generator, wherein, one end of bidirectional, dc booster converter (3) is connected with high-voltage direct current power grid (6), the other end of bidirectional, dc booster converter (3) is divided into two parallel branches: a branch road is connected with the direct-flow input end of rotor-side converter (2), the ac output end of rotor-side converter (2) is connected with the rotor (5) of double feed wind power generator, for double feed wind power generator rotor (5) provides exciting current, another branch road is connected with the DC output end of stator side current transformer (1), and the ac input end of stator side current transformer (1) is connected with the stator (4) of double feed wind power generator, forms closed-loop path.
2. double feed wind power generator group converter topologies according to claim 1 is characterized in that: described bidirectional, dc booster converter (3) is for having the bridge DC-AC-DC structure of enjoying a double blessing of interstage exchange link structure.
3. double feed wind power generator group converter topologies according to claim 1 and 2, is characterized in that: isolated form high frequency or the intermediate frequency transformer of the interstage exchange link structure of described bidirectional, dc booster converter (3) for for voltage, isolating, boost.
4. double feed wind power generator group converter topologies according to claim 1 is characterized in that: described stator side current transformer (1) is for for reducing the three-phase full-bridge controlled rectifier of wind energy conversion system stator side current harmonics, constant wind machine stator outlet side alternating current voltage frequency and amplitude.
5. double feed wind power generator group converter topologies according to claim 4, it is characterized in that: described three-phase full-bridge controlled rectifier is chopper-control rectification circuit or phase control type rectification circuit.
6. double feed wind power generator group converter topologies according to claim 1, is characterized in that: described rotor-side converter (2) employing three-phase bridge type converter structure.
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| CN2013103570534A CN103441528A (en) | 2013-08-15 | 2013-08-15 | Converter topological structure for doubly-fed wind generating set |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887789A (en) * | 2014-04-10 | 2014-06-25 | 曲阜师范大学 | Double-fed wind generation set converter topological structure for flexible direct-current electricity transmission system |
| CN103904639A (en) * | 2014-04-11 | 2014-07-02 | 曲阜师范大学 | Double-fed wind turbine generator converter control method used for flexible direct current power transmission system |
| CN106887862A (en) * | 2015-12-11 | 2017-06-23 | 中国电力科学研究院 | A kind of high power DC exports Wind turbines topological structure |
| CN110022072A (en) * | 2019-05-23 | 2019-07-16 | 河北工业大学 | A kind of control system and method for current transformer energy feedback circuit |
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| EP2284639A1 (en) * | 2009-08-11 | 2011-02-16 | ABB Research Ltd. | Power converter assembly for solar power plant |
| CN102064712A (en) * | 2010-12-24 | 2011-05-18 | 东南大学 | Power electronic transformer based on simple PFC (Power Factor Correction) |
| CN102064702A (en) * | 2010-12-31 | 2011-05-18 | 刘闯 | Bidirectionally isolating type series resonance DC/DC converter |
| CN103236711A (en) * | 2013-03-07 | 2013-08-07 | 曲阜师范大学 | Topological structure of high-voltage direct-current transformer for double-fed wind generator set |
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2013
- 2013-08-15 CN CN2013103570534A patent/CN103441528A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2284639A1 (en) * | 2009-08-11 | 2011-02-16 | ABB Research Ltd. | Power converter assembly for solar power plant |
| CN102064712A (en) * | 2010-12-24 | 2011-05-18 | 东南大学 | Power electronic transformer based on simple PFC (Power Factor Correction) |
| CN102064702A (en) * | 2010-12-31 | 2011-05-18 | 刘闯 | Bidirectionally isolating type series resonance DC/DC converter |
| CN103236711A (en) * | 2013-03-07 | 2013-08-07 | 曲阜师范大学 | Topological structure of high-voltage direct-current transformer for double-fed wind generator set |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887789A (en) * | 2014-04-10 | 2014-06-25 | 曲阜师范大学 | Double-fed wind generation set converter topological structure for flexible direct-current electricity transmission system |
| CN103904639A (en) * | 2014-04-11 | 2014-07-02 | 曲阜师范大学 | Double-fed wind turbine generator converter control method used for flexible direct current power transmission system |
| CN103904639B (en) * | 2014-04-11 | 2016-02-03 | 曲阜师范大学 | For the Double-feed wind power unit converter control method of flexible direct current power transmission system |
| CN106887862A (en) * | 2015-12-11 | 2017-06-23 | 中国电力科学研究院 | A kind of high power DC exports Wind turbines topological structure |
| CN110022072A (en) * | 2019-05-23 | 2019-07-16 | 河北工业大学 | A kind of control system and method for current transformer energy feedback circuit |
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Application publication date: 20131211 |