CN102130465B - Direct-drive wind power generation alternating current/direct current conversion circuit and control method - Google Patents
Direct-drive wind power generation alternating current/direct current conversion circuit and control method Download PDFInfo
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- CN102130465B CN102130465B CN201010004935.9A CN201010004935A CN102130465B CN 102130465 B CN102130465 B CN 102130465B CN 201010004935 A CN201010004935 A CN 201010004935A CN 102130465 B CN102130465 B CN 102130465B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000010248 power generation Methods 0.000 title claims abstract description 12
- 230000010349 pulsation Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000005405 multipole Effects 0.000 claims description 6
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- 230000001419 dependent effect Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000009466 transformation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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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
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Abstract
The invention discloses a direct-drive wind power generation alternating current/direct current conversion circuit and a control method, which relate to an alternating current/direct current electric energy conversion circuit of a direct-drive wind power generation system. Filtering parameters of a current direct-drive wind power generation system after rectification are dependent on input voltage pulsation frequency, and a filter has a large volume, high cost, high input harmonic content and a low power factor. Alternating current output by a generator is output as variable voltage rectified alternating current after passing through a bridge type uncontrolled rectifier which is connected with a DC/DC boosting conversion circuit, and the DC/DC boosting conversion circuit controls the duty ratio of a switching tube according to an inversion input DC voltage set value by adopting a pulse width modulation (PWM) method to ensure an output voltage is constant. When in a steady state, the conversion circuit has the constant output voltage and substantially constant input current, and the generator outputs approximately rectangular wave current. When in a dynamic state, the system is regulated to fulfill the aim of outputting the constant voltage by a converter. The conversion circuit and the control method have the use that: the duty ratio of the conversion circuit is controlled to save a DC link filter, simplify the direct-drive wind power generation alternating current/direct current conversion circuit, reduce the volume and cost of the system and harmonics of the generator, and improve the system efficiency.
Description
Affiliated technical field
The present invention relates to direct-drive wind power system hand over/the directly translation circuit of electric energy, adopt certain control method, can simplify circuit system, reduce device volume and the cost of wind power system, realize directly-driving wind power generation system to hand over/the directly conversion of electric energy, meet the voltage request of combining inverter to DC link.
Background technology
At present, the translation circuit part of hand over/straight electric energy of direct-drive wind power system extensively adopts: the three-phase bridge that the variable voltage variable frequency alternating current that multipole magneto alternator produces is made up of diode not control rectifying circuit carries out rectification, the pulsation luffing direct voltage of exporting obtains luffing direct current more stably by large capacitor filtering, obtain direct voltage more stably by DC transfer circuit again, carry out inversion to supply with Converting Unit, to electrical network transmission of electric energy.In order to suppress the impact of inrush current on generator, reduce the pulse amplitude of capacitor charging electric current, reduce dynamo current harmonic wave, improve generator power factor, the reactor with current limliting and filtering double duty is all set before filter capacitor.
Because wind speed changes, the ac frequency excursion that the multipole magneto alternator of direct drive wind power system sends is larger, the filtering link parameter of rectifier bridge output DC side is generally determined with minimum wind conditions, therefore, the numerical value of filter capacitor and filter reactor is larger, and volume and the cost of device are higher.
In the Shunt-connected Wind Power Generation System, control for convenient, remove the coupling between wind power generation part and the output of synchronization AC electric energy, inverter needs the voltage stabilization of DC link.For this reason, DC/DC conversion link need to be set between rectifying and wave-filtering and inversion.At present, this DC/DC conversion link realizes by boost chopper, and the increase of power is by selecting large capacity circuit element or realizing with multiple boost conversion circuits are in parallel.
In boost chopper, input, output are respectively arranged with inductance and electric capacity, its inductance parameters depends primarily on power and the chopper operating frequency that chopper circuit transmits, irrelevant with the ripple frequency of input electric energy, capacitance parameter depends primarily on pulsation amplitude, power output and the ceiling voltage numerical value that output voltage allows.
Summary of the invention
In order to overcome the defect of existing filter circuit parameter-dependent DC input voitage ripple frequency, reduce volume and the cost of wind generator system device, the invention provides a kind of friendship/straight transformation of electrical energy circuit, and adopt certain control method, can remove inductance and the electric capacity of filter circuit, the degree of pulsatility that the degree of pulsatility that the input inductance of DC/DC conversion part and output filter capacitor can allow according to translation circuit input current and output voltage allow determines, relevant with switching tube operating frequency, irrelevant with amplitude and the degree of pulsatility of input direct voltage.
The technical solution adopted for the present invention to solve the technical problems is: the three-phase output end of magneto alternator and the three-phase bridge not three-phase input end of control rectifying circuit are connected respectively, the inductance element of output and DC/DC conversion circuit input end joins, DC/DC conversion circuit output end connects filter capacitor, and DC/DC conversion circuit adopts boost chopper (Boost) circuit.When control, be added to boost chopper input by the transformation Rectified alternating current of not controlling rectifier bridge input, the numerical value that converter needs according to Converting Unit direct voltage, adopt the duty ratio of method control switch pipe of PWM, guarantee the constant of the in the situation that of input DC voltage change output dc voltage.Under stable situation, boost chopper output voltage is constant, input current substantially constant, the approximate output of magneto alternator square wave current.Under current intelligence, system is constant in target take boost chopper output voltage, implements dynamically to adjust.
The invention has the beneficial effects as follows: by controlling the duty ratio of boost chopper switch element, draw and be transferred to the electric energy of inversion side from rectification link with the form control of extraneous wind speed controlled current source, thereby simplifying directly driven wind-powered system hands over/straight transform part circuit, save filter capacitor and filter inductance, reduce system bulk and cost, reduce generator harmonic wave, improve directly-driving wind power generation system efficiency.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described.
Accompanying drawing is circuit theory diagrams of the present invention.
In figure, PMSM is multipole magneto alternator, D
1～D
6for the not rectifier diode of control rectifier of three-phase, L is boost chopper input inductance, and VT is its switching tube, can be the elements such as field effect transistor or GTR, IGBT, GTO, D
7be boost chopper output diode, C is output filter capacitor.
Specific implementation method
In accompanying drawing, multipole magneto alternator produces variable voltage variable frequency alternating current under wind energy conversion system drives, and this three-phase alternating current is not controlled bridge through three-phase and is rectified into the Rectified alternating current that amplitude changes.Transformation Rectified alternating current is directly added to the input of DC/DC conversion device without filtering, the controller of converter is according to the numerical value of output dc voltage requirement and current input direct voltage, the duty ratio of control switch pipe, implements boosting inverter control, the constant DC voltage of output regulation.According to the control requirement of wind generator system, the electric energy of combining inverter institute feed electrical network is relevant with the size of wind speed, and, in certain wind speed situation, the electric current of converter output keeps constant.According to boost chopper (Boost) circuit input/output relation, converter constant output current, its input current is also for being approximately constant, for not controlling rectifier bridge, DC/DC conversion device becomes the current source loads of a wind-engaging speed control system, the alternating current of generator output is the approximate square wave current of 120 °, but not pulse current while originally adopting capacitor filtering is (or at inductance, the approximate square wave current with two domes in capacitor filtering situation, the prominent degree of point of dome is relevant with the size of inductance, electric capacity one timing, inductance is less, dome is more sharp-pointed).In the time that wind speed changes, also follow variation as the electric current of rectifier bridge current source loads,, under current intelligence, will there is changes in amplitude in the AC square wave current of generator output.
In accompanying drawing, three-phase is not controlled bridge rectifier diode D
1～D
6can determine its nominal parameter according to its maximum working voltage, maximum operating currenbt.Rated voltage is defined as 2～3 times of inverse peak voltage amplitude that diode bears.If the current effective value that diode flow through in this rectification circuit is I
d, diode rated current I
ecomputing formula be:
The maximum power that curent change pulsating quantity that the input inductance numerical value L of DC/DC conversion device can allow according to input current in switch process (be traditionally arranged to be less than rated current 20%) and wind generator system transmit is determined.The computing formula of inductance L is:
In formula: U
in, U
ofor converter input, output voltage values, I
dn, k, T
sbe respectively current average, current ripples coefficient, converter PWM control cycle that inductance flows through.
The maximum current amplitude that switching tube VT parameter can be passed through according to switching tube in the PWM course of work and the maximum voltage bearing under disconnection are determined.
DC/DC conversion device two utmost point D that boost
7the parameter voltage that can bear in circuit according to it and the maximum current flowing through determine, determine formula and rectifier diode computing formula is identical above.
The DC voltage ripple numerical value that the parameter of DC/DC conversion device output filter capacitor C can allow according to DC side and converter connect load maximum and determine.
In formula, T, R
obe respectively output dc voltage pulsation period, the converter output equivalent load resistance that connects.
Claims (2)
1. the control method of direct-drive wind power generation alternating current/direct current conversion circuit, multipole magneto alternator, three-phase bridge not control rectifying circuit, booster type DC/DC conversion circuit are linked in sequence, it is characterized in that: the three-phase output of multipole magneto alternator and the three-phase bridge not three-phase input end of control rectifying circuit are connected respectively, three-phase bridge not control rectifying circuit output and booster type DC/DC conversion circuit input end is connected, the inverter load that the electric energy of straight/straight boost conversion circuit output of booster type connects after supplying with; Require in situation by PWM control method based on output voltage is constant, save the not filter circuit after control rectifying circuit of three-phase bridge, the filter circuit saving comprises filter inductance and filter capacitor, its parameter is relevant with the power of input direct voltage ripple frequency and transmission, after the booster type DC/DC conversion circuit that connects as requested input voltage is boosted, meet output and connect inverter load steady and numerical value requirement to the perseverance of direct voltage; When control, the control circuit of booster type DC/DC conversion circuit, according to the needs of output direct voltage, adopts the duty ratio of PWM method control booster type DC/DC conversion contactor pipe, guarantees that output dc voltage is constant under input direct voltage situation of change; In certain wind speed situation, booster type DC/DC conversion circuit output voltage is constant, input current substantially constant, not control rectifying circuit of three-phase bridge relatively, booster type DC/DC conversion circuit becomes the current source loads of a wind-engaging speed control system, 120 ° of approximate square wave currents of generator output, in the time that wind speed changes, system is constant in target take booster type DC/DC conversion circuit output dc voltage, implements dynamically to adjust, and changes in amplitude will occur the AC square wave current of generator output; The current pulsation amount that booster type DC/DC conversion circuit input inductance L allows according to input current and the maximum power of wind power system transmission are determined, have nothing to do with booster type DC/DC conversion circuit input direct voltage amplitude and degree of pulsatility, and the calculating formula of inductance L is:
in formula: U
in, U
ofor the input of booster type DC/DC conversion circuit, output voltage values, I
dn, k, T
sbe respectively current average, current ripples coefficient, booster type DC/DC conversion circuit PWM control cycle that inductance flows through, f is the frequency that straight/straight boost conversion circuit PWM of booster type controls, with booster type DC/DC conversion circuit PWM control cycle T
sbetween become reciprocal relation, that is:
2. the control method of direct-drive wind power generation alternating current/direct current conversion circuit according to claim 1, it is characterized in that: the DC voltage ripple numerical value that booster type DC/DC conversion circuit output filter capacitor C allows according to output and the load that circuit connects of booster type DC/DC conversion are determined
in formula, T, R
obe respectively minimum pulsation period of output dc voltage, the booster type DC/DC conversion circuit output equivalent load resistance that connects.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010004935.9A CN102130465B (en) | 2010-01-20 | 2010-01-20 | Direct-drive wind power generation alternating current/direct current conversion circuit and control method |
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|---|---|---|---|
| CN201010004935.9A CN102130465B (en) | 2010-01-20 | 2010-01-20 | Direct-drive wind power generation alternating current/direct current conversion circuit and control method |
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| CN102130465A CN102130465A (en) | 2011-07-20 |
| CN102130465B true CN102130465B (en) | 2014-06-11 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105939121A (en) * | 2015-11-23 | 2016-09-14 | 中国矿业大学 | Wind generator current-adjustment and phase-modulation control-based parallel DCM Boost PFC converter |
| CN109995068B (en) * | 2017-12-29 | 2020-10-09 | 北京金风科创风电设备有限公司 | Fault ride-through control apparatus and method |
| CN113302828B (en) * | 2020-10-16 | 2023-11-17 | 深圳欣锐科技股份有限公司 | Voltage conversion circuit and electronic device |
-
2010
- 2010-01-20 CN CN201010004935.9A patent/CN102130465B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| Kuo-Hen Chaos，Po-Tai Cheng.Power Decoupling Methods for single-phase three-poles AC/DC converters.《Energy Conversion and Exposition，2009》.2009,3742-3747. * |
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| CN102130465A (en) | 2011-07-20 |
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Effective date of registration: 20170503 Address after: 224400 No. 7, Mount Lu Road, Funing Economic Development Zone, Jiangsu Patentee after: Zhongke Tiangong electric Limited by Share Ltd Address before: 224051 9 hope Avenue, Yancheng Institute Of Technology, Jiangsu, Yancheng City Patentee before: Yangcheng Institute of Technology |
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Correction item: Patentee|Address Correct: Zhongke Tiangong Electric Holding Co., Ltd.|224400 No. 7, Mount Lu Road, Funing Economic Development Zone, Jiangsu False: Zhongke Tiangong electric Limited by Share Ltd|224400 No. 7, Mount Lu Road, Funing Economic Development Zone, Jiangsu Number: 21 Volume: 33 |