CN203911789U - Wind power generation system based on full-wave chopped-control rectifying circuit - Google Patents
Wind power generation system based on full-wave chopped-control rectifying circuit Download PDFInfo
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- CN203911789U CN203911789U CN201420236626.8U CN201420236626U CN203911789U CN 203911789 U CN203911789 U CN 203911789U CN 201420236626 U CN201420236626 U CN 201420236626U CN 203911789 U CN203911789 U CN 203911789U
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- wave
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- control rectifying
- rectifying circuit
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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
Provided is a wind power generation system based on a full-wave chopped-control rectifying circuit. The system is characterized by comprising a prime motor, a gear case, a power generator, a transformer, N full-wave chopped-control rectifying circuits, and a DC system. The output end of the power generator is connected with the primary winding of the transformer. The secondary winding of the transformer is provided with N isolated coils. Each coil is connected with the AC input end of the full-wave chopped-control rectifying circuit. The full-wave chopped-control rectifying circuit comprises a single-phase full-bridge diode rectifying circuit, a filtering capacitor, and a chopper circuit. The AC sides of the N full-wave chopped-control rectifying circuits are isolated from each other, and the DC sides are connected in series, and the DC sides are connected with a DC system for collecting and transmitting electric power. Current distortion rate of the AC sides of the N full-wave chopped-control rectifying circuits is very low, and output voltage of the DC sides is adjustable in the range from 0 to a maximum value.
Description
Technical field
The present invention relates to a kind of wind generator system power transferring method, in particular, relate to a kind of wind generator system of cutting control rectifying circuit based on all-wave.
Background technology
Along with global warming, CO2 emissions continues to increase and the petering out of traditional fossil energy, people are more and more to the concern of regenerative resource, and land solar energy is relative ripe with the development technique of wind energy, and large-scale development, and offshore wind farm is because offshore is far away, its construction and maintenance is just very difficult, for offshore wind power plant far away, direct current transmission becomes unique alternative delivery of electrical energy scheme, the electric energy of the distant wind power plant of present offshore collects with the method for conversion: wind-driven generator adopts asynchronous double-fed wind power generator, by gear box, rotating speed is brought up near rated speed, the rotor of double-fed induction blower fan adopts AC excitation, taking the output voltage of controlling asynchronous double-fed wind power generator as 50Hz, then be elevated to 35kV through step-up transformer, carrying out middle pressure confluxes, by converter transformer and voltage source converter (the Voltage Source Convertor of offshore platform, VSC) alternating current is changed into direct current, then transmit by seabed direct current cables.This method need to be built expensive offshore platform for placing converter transformer, voltage source converter and auxiliary device thereof, and construction cost is high, and the cycle is long, difficult in maintenance, and power loss when operation is larger.Wind electric converter adopts power electronic equipment to carry out AC excitation, and the failure rate of this equipment is high, has increased maintenance cost.Existing offshore wind power system adopts the interchange of medium voltate grade to conflux, and its switchgear is more, and complex structure.In the time there is ac short circuit, larger on the impact of wind generator system, may cause blower fan large area off-grid.
At present, there are many sections of documents to be studied for the offshore wind farm of DC series, the offshore wind farm of DC series collects with the DC side of transmission system employing current transformer connects, obtain a high voltage, collecting and transmitting for offshore wind farm, strictly speaking, the power of traditional wind power generation collects method: conflux, and the power of wind generator system based on DC series collects method and is: converge and press, owing to obtaining a high voltage by the mode of series connection, so can save offshore platform and high-voltage large-capacity voltage source converter, thereby construction cost and operation cost are significantly reduced, reduce the structure of system, improve reliability.But due to the inherent defect of traditional A.C.-D.C. converter, cause the just conceptual phase in early stage of wind generator system of DC series structure, and do not there is practical value, its performance does not meet the requirement of wind generator system: ac-side current distortion is little, and DC side output voltage is from 0 adjustable arbitrarily to maximum, current transformer technology maturation, cost is low, loss is little, controls simply, and reliability is high.The DC voltage of the phase controlled rectifier based on thyristor can regulate arbitrarily, but ac-side current distortion is large, and performance and life-span to wind-driven generator are caused significant impact; Wind electric converter (Voltage Source Convertor, VSC) ac-side current irregularity of wave form based on voltage source converter is very little, but DC voltage cannot regulate arbitrarily, is not suitable for the wind power system of DC series; Wind electric converter (Current Source Convertor based on full-control type current source converter, CSC) ac-side current irregularity of wave form is little, and DC voltage can regulate arbitrarily, but its technology is immature, and loss is larger, control difficulty, and otherwise application almost there is no yet, research for CSC is also very limited, just rests on theoretical research stage.
Summary of the invention
For the defect of prior art, the invention provides a kind of wind generator system of cutting control rectifying circuit based on all-wave, it is very little that wherein all-wave is cut the ac-side current distortion of control rectifying circuit, its DC side output is that a galvanic current is pressed, and 0 to adjustable arbitrarily between maximum, adjust the power output of wind generator system by adjusting VD, make DC side series connection be more prone to realize.
The present invention adopts following methods to realize object of the present invention.
A wind generator system of cutting control rectifying circuit based on all-wave, is characterized in that: by prime mover, and gear box, generator, transformer, N all-wave cut control rectifying circuit and direct current system formation.
Wherein prime mover converts wind-force to the mechanical energy of fan blade rotation, after gear box accelerates, drives the rotor of generator, and mechanical energy is changed into electric energy by generator.
The output of generator connects a winding of transformer, and the secondary winding of transformer has N the coil of isolation mutually, the interchange input that each coil connects all-wave cuts control rectifying circuit.
The direct current output that N all-wave cut control rectifying circuit is connected in series, and then accesses direct current system.
Direct current system is collected for wind-powered electricity generation, and transmission is with grid-connected.
All-wave is cut control rectifying circuit and is comprised single-phase full bridge diode rectifier circuit, filter capacitor, chopper circuit.
Single-phase full bridge diode rectifier circuit is cut the interchange input of control rectifying circuit as all-wave, the direct current side joint filter capacitor (C) of single-phase full bridge diode rectifier circuit, the input of chopper circuit connects the two ends of filter capacitor, and the output of control rectifying circuit is cut in the output of chopper circuit as all-wave.
Described chopper circuit is substance chopper circuit or by multiple substance chopper circuits multiple chopper circuit forming that is connected in parallel.
Wherein substance chopper circuit is buck circuit, by IGBT(T), diode (D) and inductance (L) form, the collector electrode of IGBT is as the positive pole input of chopper circuit, the emitter of IGBT, the negative electrode of diode (D) is connected with one end of inductance (L), and the anode of diode (D) is as the negative pole of the input and output of chopper circuit, and the other end of inductance (L) is as the positive pole of chopper circuit output.
The duty ratio of IGBT in described chopper circuit is:
(1)。
Wherein D is the duty ratio of IGBT in described DC chopper circuit, and Vdc is described diode rectifier circuit DC voltage instantaneous value, I
1for DC chopper circuit outlet side electric current, G is equivalent conductance; By controlling the size of equivalent conductance (G), just can control the size of Output Voltage in Rectified Circuits.
Wherein filter capacitor (C) and chopper circuit can be equivalent to an electricity and lead as the electricity of G and lead, and are connected to the DC side of diode rectifier circuit, thereby make the ac-side current of diode rectifier circuit for sinusoidal wave.
The output voltage that all-wave is cut control rectifying circuit is:
（2）。
If the mathematic(al) representation of diode AC voltage is:
（3）。
Diode direct-current side voltage expression formula is:
（4）。
Bringing formula (4) into formula (2) can obtain all-wave and cut the output voltage of control rectifying circuit and be:
（5）。
Can be seen by formula (5), all-wave is cut in the output voltage of control rectifying circuit and is contained DC component and harmonic.
The secondary side of described transformer is made up of one or more groups three-phase alternating-current supply, supposes that wherein the voltage of one group of three-phase alternating-current supply is:
（6）。
Can obtain each all-wave according to formula (5) cuts the output voltage of control rectifying circuit and is:
（7）。
The DC side of cutting control rectifying circuit due to all-wave is connected in series, and its DC side output voltage is:
（8）。
Formula (7) substitution formula (8) can be obtained:
（9）。
Can be found out by formula (9), the DC side output voltage that three-phase full-wave is cut control rectifying circuit is that a galvanic current is pressed, single all-wave is cut after the DC side series connection of control rectifying circuit, frequency multiplication wave component in its output voltage has been cancelled out each other, and the electric current of three-phase alternating-current supply input is sinusoidal wave, can change by changing the size of equivalent conductance (G) output voltage of three-phase half-controlled rectifier circuit.
Described generator is magneto alternator or the synchronous generator that adopts DC excitation.
Adopt solution provided by the present invention can be achieved as follows benefit.
All-wave cut control rectifying circuit DC side output voltage stabilization and can be 0 to adjustable between maximum, ac-side current aberration rate is very little, it controls simple.
The current transformer of equal capacity, it is less, cost-saving that all-wave is cut the switching device used of control rectifying circuit, and volume is little, compact conformation.
The capacity extension that all-wave is cut control rectifying circuit easily realizes, and can expand its size of current by more multiple chopper circuit, can be cut control rectifying circuit and realized by the more all-wave of connecting the expansion of voltage.
The wind generator system unsteady flow link of cutting control rectifying circuit based on all-wave is less, and therefore loss is less.
Wind-driven generator adopts the synchronous generator of magneto alternator or DC excitation, and it is simple in structure, technology maturation, and reliability is high.
When the frequency of generator output AC voltage changes within the specific limits, the direct voltage of cutting the wind generator system output of control rectifying circuit based on all-wave is still stable and adjustable direct voltage.
Owing to having transformer to isolate between generator and current transformer, therefore, can cut control rectifying circuit to generator and all-wave and carry out independent design, it is operated under optimum voltage and current grade.
Adopt full control copped wave rectification circuit, be easy to realize that wind-powered electricity generation based on DC side series connection collects, transmission and grid-connected system, and control easily and realize; control under stable operation and fault is fairly simple with protection, and system configuration is simple, and cost is low; running wastage is little, and operation expense is low.
Brief description of the drawings
Fig. 1 is the wind generator system of cutting control rectifying circuit based on all-wave.
Fig. 2 is the structure chart that all-wave is cut control rectifying circuit.
Embodiment
A wind generator system of cutting control rectifying circuit based on all-wave, is characterized in that: by prime mover, and gear box, generator, transformer, N all-wave cut control rectifying circuit and direct current system formation.
Wherein prime mover converts wind-force to the mechanical energy of fan blade rotation, after gear box accelerates, drives the rotor of generator, and mechanical energy is changed into electric energy by generator.
The output of generator connects a winding of transformer, and the secondary winding of transformer has N the coil of isolation mutually, the interchange input that each coil connects all-wave cuts control rectifying circuit.
The direct current output that N all-wave cut control rectifying circuit is connected in series, and then accesses direct current system.
Direct current system is collected for wind-powered electricity generation, and transmission is with grid-connected.
All-wave is cut control rectifying circuit and is comprised single-phase full bridge diode rectifier circuit, filter capacitor, chopper circuit.
Single-phase full bridge diode rectifier circuit is cut the interchange input of control rectifying circuit as all-wave, the direct current side joint filter capacitor (C) of single-phase full bridge diode rectifier circuit, the input of chopper circuit connects the two ends of filter capacitor, and the output of control rectifying circuit is cut in the output of chopper circuit as all-wave.
Described chopper circuit is substance chopper circuit or by multiple substance chopper circuits multiple chopper circuit forming that is connected in parallel.
Wherein substance chopper circuit is buck circuit, by IGBT(T), diode (D) and inductance (L) form, the collector electrode of IGBT is as the positive pole input of chopper circuit, the emitter of IGBT, the negative electrode of diode (D) is connected with one end of inductance (L), and the anode of diode (D) is as the negative pole of the input and output of chopper circuit, and the other end of inductance (L) is as the positive pole of chopper circuit output.
The duty ratio of IGBT in described chopper circuit is:
(1)。
Wherein D is the duty ratio of IGBT in described DC chopper circuit, and Vdc is described diode rectifier circuit DC voltage instantaneous value, I
1for DC chopper circuit outlet side electric current, G is equivalent conductance; By controlling the size of equivalent conductance (G), just can control the size of Output Voltage in Rectified Circuits.
Wherein filter capacitor (C) and chopper circuit can be equivalent to an electricity and lead as the electricity of G and lead, and are connected to the DC side of diode rectifier circuit, thereby make the ac-side current of diode rectifier circuit for sinusoidal wave.
The output voltage that all-wave is cut control rectifying circuit is:
（2）。
If the mathematic(al) representation of diode AC voltage is:
（3）。
Diode direct-current side voltage expression formula is:
（4）。
Bringing formula (4) into formula (2) can obtain all-wave and cut the output voltage of control rectifying circuit and be:
（5）。
Can be seen by formula (5), all-wave is cut in the output voltage of control rectifying circuit and is contained DC component and harmonic.
The secondary side of described transformer is made up of one or more groups three-phase alternating-current supply, supposes that wherein the voltage of one group of three-phase alternating-current supply is:
（6）。
Can obtain each all-wave according to formula (5) cuts the output voltage of control rectifying circuit and is:
（7）。
The DC side of cutting control rectifying circuit due to all-wave is connected in series, and its DC side output voltage is:
（8）。
Formula (7) substitution formula (8) can be obtained:
（9）。
Can be found out by formula (9), the DC side output voltage that three-phase full-wave is cut control rectifying circuit is that a galvanic current is pressed, single all-wave is cut after the DC side series connection of control rectifying circuit, frequency multiplication wave component in its output voltage has been cancelled out each other, and the electric current of three-phase alternating-current supply input is sinusoidal wave, can change by changing the size of equivalent conductance (G) output voltage of three-phase half-controlled rectifier circuit.
Described generator is magneto alternator or the synchronous generator that adopts DC excitation.
Claims (3)
1. a wind generator system of cutting control rectifying circuit based on all-wave, is characterized in that: by prime mover, and gear box, generator, transformer, N all-wave cut control rectifying circuit and direct current system formation;
Wherein prime mover converts wind-force to the mechanical energy of fan blade rotation, after gear box accelerates, drives the rotor of generator, and mechanical energy is changed into electric energy by generator;
The output of generator connects a winding of transformer, and the secondary winding of transformer has N the coil of isolation mutually, the interchange input that each coil connects all-wave cuts control rectifying circuit;
The direct current output that N all-wave cut control rectifying circuit is connected in series, and then accesses direct current system;
Direct current system is collected for wind-powered electricity generation, and transmission is with grid-connected.
2. a kind of wind generator system of cutting control rectifying circuit based on all-wave as claimed in claim 1, is characterized in that: all-wave is cut control rectifying circuit and comprised single-phase full bridge diode rectifier circuit, filter capacitor, chopper circuit;
Single-phase full bridge diode rectifier circuit is cut the interchange input of control rectifying circuit as all-wave, the direct current side joint filter capacitor (C) of single-phase full bridge diode rectifier circuit, the input of chopper circuit connects the two ends of filter capacitor, and the output of control rectifying circuit is cut in the output of chopper circuit as all-wave;
Described chopper circuit is substance chopper circuit or by multiple substance chopper circuits multiple chopper circuit forming that is connected in parallel;
Wherein substance chopper circuit is buck circuit, by IGBT(T), diode (D) and inductance (L) form, the collector electrode of IGBT is as the positive pole input of chopper circuit, the emitter of IGBT, the negative electrode of diode (D) is connected with one end of inductance (L), and the anode of diode (D) is as the negative pole of the input and output of chopper circuit, and the other end of inductance (L) is as the positive pole of chopper circuit output.
3. a kind of wind generator system of cutting control rectifying circuit based on all-wave as claimed in claim 1, is characterized in that: described generator is magneto alternator or the synchronous generator that adopts DC excitation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420236626.8U CN203911789U (en) | 2014-05-10 | 2014-05-10 | Wind power generation system based on full-wave chopped-control rectifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420236626.8U CN203911789U (en) | 2014-05-10 | 2014-05-10 | Wind power generation system based on full-wave chopped-control rectifying circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203911789U true CN203911789U (en) | 2014-10-29 |
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|---|---|---|---|
| CN201420236626.8U Expired - Fee Related CN203911789U (en) | 2014-05-10 | 2014-05-10 | Wind power generation system based on full-wave chopped-control rectifying circuit |
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|---|---|
| CN (1) | CN203911789U (en) |
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2014
- 2014-05-10 CN CN201420236626.8U patent/CN203911789U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20170510 |
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| CF01 | Termination of patent right due to non-payment of annual fee |