CN103532409A - Three-phase flyback voltage-multiplying single-switch rectifying circuit for small-scale wind power generation - Google Patents

Three-phase flyback voltage-multiplying single-switch rectifying circuit for small-scale wind power generation Download PDF

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CN103532409A
CN103532409A CN201310487319.7A CN201310487319A CN103532409A CN 103532409 A CN103532409 A CN 103532409A CN 201310487319 A CN201310487319 A CN 201310487319A CN 103532409 A CN103532409 A CN 103532409A
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CN103532409B (en
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王议锋
王成山
杨良
郭力
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Tianjin University
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Tianjin University
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects

Abstract

The invention discloses a three-phase flyback voltage-multiplying single-switch rectifying circuit for small-scale wind power generation. The circuit comprises a three-phase AC (Alternating Current) power supply, filtering capacitors C1, C2 and C3, a three-phase single-switch BOOST rectifying circuit, three flyback voltage-multiplying rectifying circuits, a signal acquisition circuit and a control circuit; the three-phase single-switch BOOST rectifying circuit comprises an uncontrollable rectifier bridge and a BOOST booster circuit; a three-phase single switch VT is controlled to be switched on and off by adopting a pulse frequency modulation (PFM) technology; an output voltage of the integral three-phase single-switch BOOST voltage-multiplying rectifying circuit is the sum of voltages on output capacitors Ca, Cb and Cc of a three-phase voltage-multiplying circuit and an output capacitor Co of a main circuit, so that the rectified output voltage is improved. Compared with the prior art, the rectifying circuit has the characteristics of high efficiency, high output voltage and the like compared with a conventional three-phase uncontrollable rectifying circuit and is very suitable for being used under the conditions with a lower wind speed and difficulty and high requirements on energy harvesting.

Description

Three-phase inverse-excitation type multiplication of voltage list switch rectifying circuit for small-size wind power-generating
Technical field
The present invention relates to small-sized wind power generator translation circuit technical field, particularly relate to a kind of novel rectification circuit that can realize inverse-excitation type multiplication of voltage, there is greater efficiency, can work when blower fan output voltage is lower.
Background technology
Wind energy is a kind of novel energy, and it has the advantages such as renewable, pollution-free, cost of investment is low, is a kind of clean energy resource that can fully study and utilize under nowadays energy shortage situation.In many countries and regions, wind power generation, in occupation of a big chunk proportion of generating total amount, brings great convenience and economic interests, therefore, the research of wind generating technology is had great significance.Yet the application of wind power generation is subject to the impact in geographical position larger, in the area of some poor wind, few wind, because wind speed is lower, the output voltage of blower fan generator is lower, can not collect well utilization, causes a large amount of energy losses.Therefore, be necessary original wind-driven generator rectification circuit to improve, make it there is higher voltage gain, improve the input voltage amplitude of rectification outlet side.
Traditional small-sized wind power generator rectification circuit has several circuit structures, and wherein the most original rectification circuit is the uncontrollable rectification circuit of three-phase, and its advantage is simple in structure, and cost is lower, is widely used, but does not have the function that improves voltage magnitude; But also having power loss large, rectification efficiency is low, the shortcoming such as cisco unity malfunction under serious, the low wind speed of input current waveform distortion.
Traditional blower fan rectification circuit adopts PWM rectifier circuit structure in addition, and this circuit adopts power switch pipe to replace not controlling the diode in rectifier bridge, by switching tube is controlled, realizes the rectified action to the three-phase alternating current of blower fan output.By using this rectification circuit can obtain comparatively desirable input current waveform, and then realize unity power factor control effect, the rectification efficiency of circuit improves greatly.But this circuit is owing to having adopted a plurality of power switch pipes, the cost of circuit increases greatly, in the situation that considering cost, be not easy to promote, and this rectification circuit can not realize the function that promotes output voltage amplitude, still can not solve the problems such as the existing output voltage of the uncontrollable rectification circuit of three-phase is lower completely.
According to the problems referred to above, in order to realize, to improve output voltage amplitude and improve the targets such as blower fan rectification efficiency, need to study that performance is better to have broad application prospects and the little blower fan boost rectifying circuit topological structure of practical value.
Summary of the invention
The problem existing in order to overcome prior art, the present invention proposes three-phase inverse-excitation type multiplication of voltage list switch rectifying circuit for a kind of small-size wind power-generating, this circuit adopts triphase single-switch boost rectification circuit in rectification side, even if not controlling rectifier bridge combines with boost booster circuit, at generator three-phase outlet side, often increase mutually a reverse coupled inductance, the former avris of coupling inductance is connected with main circuit by controlling the switch of the MOSFET pipe in boost circuit makes input current roughly present sine waveform, improves the efficiency of circuit; Secondary side adopts inverse-excitation type voltage-multiplying circuit, and voltage-multiplying circuit outlet side voltage can represent with the voltage in output capacitance.Each phase of three phase mains just forms an independent inverse-excitation type voltage-multiplying circuit like this, form altogether three voltage-multiplying circuits, by the output capacitance series connection of three voltage-multiplying circuits, the output voltage of whole rectification circuit can represent by three voltage-multiplying circuit output voltages and main circuit output voltage sum, voltage is further raise.
The present invention proposes a kind of novel voltage-multiplying type wind-driven generator rectification circuit, this circuit sequentially comprises three-phase alternating-current supply, filter capacitor C1, C2, C3, triphase single-switch BOOST rectification circuit, three inverse-excitation type voltage-multiplying circuits, signal acquisition circuit and control circuits according to input, output; Wherein:
Described three-phase alternating-current supply input side is connected with the output of wind-driven generator three-phase;
Described triphase single-switch BOOST rectification circuit, comprises uncontrollable rectifier bridge and BOOST booster circuit, and described uncontrollable rectifier bridge is comprised of 6 diode D1~D6; Described BOOST booster circuit is comprised of BOOST inductance, triphase single-switch VT, diode D7 and the DC capacitor Co of instrument transformer T1, T2, T3, and BOOST inductance is serially connected in rectifier bridge and exchanges input side, and each is connected in series a BOOST inductance mutually; In described triphase single-switch BOOST rectification circuit, the outlet side of uncontrollable rectifier bridge single switch direct and BOOST rectification circuit links together; Described control circuit carries out on/off control to the single switch VT in rectification side BOOST circuit, make rectification input side current waveform level off to sine wave, to realize unity power factor control, the MPPT maximum power point tracking in PFM control is simultaneously controlled and is made working point remain on little blower fan maximum power place;
Described inverse-excitation type voltage-multiplying circuit, comprises reverse coupled inductance T1, storage capacitor Ca, switching capacity C11, C12 and diode Da, D11, D12; Wherein: diode Da, switching capacity C11, coupling inductance secondary, switching capacity C12, storage capacitor Ca, loop in series; Diode D11 is in parallel with switching capacity C11 and coupling inductance secondary; Diode D12 is in parallel with coupling inductance secondary and switching capacity C12;
When switching tube VT conducting, in three-phase any one mutually in, by the former limit of instrument transformer T1, uncontrollable rectifier bridge, switching tube VT, form loop, this phase power supply is to the former limit of T1 induction charging, Current rise; In this while instrument transformer secondary inductance, by diode D11 and diode D12, charge respectively to switching capacity C11 and switching capacity C12, capacitor C 11, C12 voltage rise; When switching tube VT turn-offs, this one forms loop by power supply, the former limit of instrument transformer T1 inductance, uncontrollable rectifier bridge, diode D7, main circuit output capacitance Co in mutually, now, this phase power supply and the former limit of T1 inductance are jointly to output capacitance Co charging, and a phase input current reduces; Now, instrument transformer T1 secondary current is reverse, diode Da conducting, and instrument transformer T1 secondary, switching capacity C11, C12 is jointly to the output capacitance Ca charging of this phase voltage-multiplying circuit, and the voltage of capacitor C a raises; By the output capacitance Ca of three-phase voltage-multiplying circuit, Cb, Cc and main circuit output capacitance Co series connection, the output voltage of whole triphase single-switch BOOST-voltage doubling rectifing circuit is the output capacitance Ca of three-phase voltage-multiplying circuit, Cb, voltage sum on Cc and main circuit output capacitance Co, thus rectifier output voltage is improved.
Described control circuit rectification side adopts pulse frequency to control PFM technology, comprise multiplier, MPPT controller, voltage controlled oscillator VCO, trigger and a driving amplifier, its course of work is: first whole feedback control loop is first from rectifier bridge outlet side sampling average anode current and output voltage, through multiplier, obtain power output signal, input signal as MPPT controller, and control according to inputted power signal, export a variable level signal to control voltage controlled oscillator VCO, VCO is according to the sine wave of the amplitude output corresponding frequencies of input voltage, through trigger, form a series of ON time ton constant, cycle T is with the square wave of sinusoidal wave synchronous change, realizing PFM controls, break-make finally by the amplifying circuit control switch pipe of overdriving, the algorithm of MPPT controller adopts " climbing method " P& O, realizes MPPT by comparing of the power output of this collection and last time being determined increase or reduce output voltage, Δ P o> 0, illustrates that power output does not reach maximum, continues to increase output voltage and follows the tracks of, if Δ P o< 0, and situation is just in time contrary, until Δ P o=0, now, the power output of wind-driven generator is in maximum power point.
Compared with prior art, the present invention has following advantage:
1, the uncontrollable rectification circuit of the more traditional three-phase of this rectification circuit has that efficiency is high, output voltage high, is suitable for very much wind speed lower, and collection of energy difficulty requires to use in high situation.
2, the present invention adopts MPPT to control, and can realize maximal power tracing and control, and detects in real time output voltage, current value, and working point is near maximum power output value, improves the utilance of wind energy.In addition,, owing to adopting maximal power tracing, can improve collection of energy and transmittability under low wind speed;
3, the present invention can directly flow to electrical network use by the alternating current process unsteady flow effect of the amplitude of wind-driven generator output, frequency change when work.Input current is the advantage such as sinusoidal wave, output current ripple is less, can normally use under the more high and low wind speed of transducer effciency and high wind speed.In a word, no matter for electrical network or blower fan system, the present invention has positive application value.
Accompanying drawing explanation
Fig. 1 is the little blower fan rectification circuit of triphase single-switch BOOST-inverse-excitation type multiplication of voltage figure;
Fig. 2 is A phase (a certain moment) inverse-excitation type multiplication of voltage booster circuit figure;
Fig. 3 is inverse-excitation type voltage-multiplying circuit working waveform figure;
Three-phase inverse-excitation type multiplication of voltage list switch rectifying circuit process chart in the work period for Fig. 4 small-size wind power-generating, (a), process 1; (b), process 2; (c), process 3; (d), process 4; (e), process 5;
Fig. 5 rectification side control system block diagram;
Fig. 6 rectification side input current, input voltage waveform figure;
Fig. 7 outlet side output voltage waveform.
Embodiment
Below in conjunction with drawings and Examples, further describe the specific embodiment of the present invention.
First describe composition of the present invention and formation in detail, Fig. 1 is the triphase single-switch BOOST-inverse-excitation type voltage doubling rectifing circuit structure chart that is applied to small-sized wind power generator that the present invention explains.
With reference to Fig. 1, voltage-doubler rectifier provided by the invention is by three phase mains, filter capacitor C1, C2, and C3, triphase single-switch BOOST rectification circuit, three inverse-excitation type voltage-multiplying circuits, signal acquisition circuit and control circuits form.Wherein triphase single-switch BOOST rectification circuit is comprised of uncontrollable rectifier bridge and BOOST booster circuit.Described uncontrollable rectifier bridge is comprised of 6 diodes (D1~D6), exchanges input side and is connected with the output of wind-driven generator three-phase, and rectification outlet side single switch VT direct and BOOST rectification circuit links together.The effect of rectifier bridge is that the three-phase alternating current electric rectification that the frequency of little blower fan output is constantly changed is direct current, and exports next stage to.Described BOOST booster circuit is by instrument transformer T1, T2, and the former limit inductance (BOOST inductance) of T3, single switch VT, diode D7 and DC capacitor Co form.BOOST inductance does not have directly and switching tube VT place joins, but be serially connected in rectifier bridge, exchanges input side.
During normal operation, due to the switching frequency of the single switch VT frequency much larger than wind-driven generator output voltage, so in the one-period of BOOST circuit normal operation, input voltage can be regarded a steady state value as.The situation when input voltage of take is greater than zero is example, and when single switch VT opens, generator output three-phase alternating current forms loop through the former limit of instrument transformer inductance, rectifier bridge and switching tube VT, and to BOOST induction charging; When single switch VT disconnects, through three phase mains, BOOST inductance, rectifier bridge, diode D7 and DC bus capacitor Co, form loop, by blower fan and BOOST inductance, jointly to main circuit output capacitance Co, charged.
Described inverse-excitation type voltage-multiplying circuit (A of take is example mutually) is by reverse coupled inductance T1, storage capacitor Ca, switching capacity C11, C12 and diode Da, D11, D12 forms, as shown in Figure 1, wherein, diode Da, switching capacity C11, coupling inductance secondary, switching capacity C12, storage capacitor Ca loop in series; Diode D11 is in parallel with switching capacity C11 and coupling inductance secondary; Diode D12 is in parallel with coupling inductance secondary and switching capacity C12.
As shown in Figure 1, the A of take is example mutually, because the switching frequency of switch mosfet pipe VT is far longer than the frequency of three phase mains, so in a switch periods, the voltage of three phase mains can be regarded a constant as.When switching tube VT conducting, A forms loop by the former limit of instrument transformer T1, uncontrollable rectifier bridge, switching tube VT in mutually, and A phase power supply is to the former limit of T1 induction charging, Current rise; In this while instrument transformer secondary inductance, by diode D11 and diode D12, charge respectively to switching capacity C11 and switching capacity C12, capacitor C 11, C12 voltage rise.When switching tube VT turn-offs, A forms loop by power supply, the former limit of instrument transformer T1 inductance, uncontrollable rectifier bridge, diode D7, main circuit output capacitance Co in mutually, and now, the former limit of A phase power supply and T1 inductance is jointly to output capacitance Co charging, and A phase input current reduces; Now, instrument transformer T1 secondary current is reverse, diode Da conducting, and instrument transformer T1 secondary, switching capacity C11, C12 is jointly to the output capacitance Ca charging of A phase voltage-multiplying circuit, and the voltage of capacitor C a raises.The operation principle of B phase and C phase can be with similar methods analyst, as shown in Figure 1, by the output capacitance Ca of ABC three-phase voltage-multiplying circuit, Cb, Cc and main circuit output capacitance Co series connection, the output voltage of whole triphase single-switch BOOST-voltage doubling rectifing circuit can be used the output capacitance Ca of ABC three-phase voltage-multiplying circuit, Cb, voltage sum on Cc and main circuit output capacitance Co represents, thereby rectifier output voltage is improved.
Signal sample circuit is divided into again two kinds of voltage signal acquisition circuit and current signal Acquisition Circuit.Voltage signal acquisition circuit Real-time Collection rectification side rectifier bridge output dc voltage.The direct current of current signal Acquisition Circuit Real-time Collection rectification side rectifier bridge output.
According to Fig. 2, Fig. 3, Fig. 4, analyze the specific works process of inverse-excitation type multiplication of voltage booster circuit in the mutually a certain moment of A below.As shown in Figure 2, be A phase (a certain moment) inverse-excitation type multiplication of voltage booster circuit figure, wherein: L k1, L k2be respectively the former and deputy limit leakage inductance of instrument transformer, L mfor the magnetizing inductance of instrument transformer, the no-load voltage ratio that n is instrument transformer, C s1parasitic capacitance for switching tube.As Fig. 3, V gSfor switch controlled signal, i afor A phase primary current, i afor secondary current, i c11, i c12the electric current flowing through for capacitor C 11, C12.
Process 1[t 0, t 1]: at t 0switching tube VT conducting constantly, as shown in Fig. 3, Fig. 4 (a), now due to the afterflow of A phase secondary inductance, diode Da conducting, instrument transformer secondary inductance, switching capacity C11, C12 continues to charge to A phase multiplication of voltage output capacitance Ca by diode Da, i c11, i c12from negative value, become 0; Meanwhile, primary current rises to t1 constantly, process 1 end since 0.
Process 2[t 1, t 2]: at t 1the electric current that C11, C12 flow through is constantly 0, as shown in Fig. 3, Fig. 4 (b), because power supply is to the mutually former limit of A inductance, i.e. leakage inductance L k1charging, therefore A phase primary current rises to t 2constantly reach peak value; Secondary inductance charges to switching capacity C11, C12 by diode D11, D12 respectively, the sense of current as shown in Fig. 4 (b), i c11, i c12rise to t 2constantly reach forward peak value.
Process 3 [t 2, t 3]: at t 2switching tube VT turn-offs constantly, as shown in Fig. 3, Fig. 4 (c), and now diode D7 conducting, in main circuit, the former limit of power supply and mutual inductance inductance charges to main circuit output capacitance Co by diode D7, and main circuit current declines, i.e. i adecline; Now, due to instrument transformer secondary leakage inductance afterflow effect, the sense of current can not suddenly change, secondary inductance still to switching capacity C11, C12 charging, the sense of current as shown in Fig. 4 (c), i c11, i c12decline, to t 3constantly reduce to 0.
Process 4[t 3, t 4]: as shown in Fig. 3, Fig. 4 (d), now diode Da conducting, i c11, i c12for negative value, i.e. instrument transformer secondary inductance, switching capacity C11, C12 charges to A phase multiplication of voltage output capacitance Ca by diode Da, because the former limit of instrument transformer is to secondary transferring energy, therefore, i c11, i c12oppositely rise to t 4constantly reach reversed peak; Now main circuit continues the charging to capacitor C o, i acontinue to decline until t 4to be 0 constantly.
Process 5[t 4, t 5]: as shown in Fig. 3, Fig. 4 (e), interior switching tube VT keeps turn-offing during this period of time, and main circuit current is 0; Voltage-multiplying circuit will be by instrument transformer secondary inductance, switching capacity C11, and C12 charges to A phase multiplication of voltage output capacitance Ca by diode Da, i c11, i c12absolute value decline, until t 5constantly enter next cycle, complete the work of one-period.
Within a work period, multiplication of voltage output capacitance Ca and main circuit output capacitance Co continue to power to the load, and the output voltage of whole circuit can be regarded a steady state value as.
Control circuit is controlled the single switch in rectification side BOOST circuit.As Fig. 5, rectification side adopts pulse frequency to control (PFM) technology, comprises a multiplier, MPPT controller, voltage controlled oscillator VCO, trigger and a driving amplifier.Its course of work is: first whole feedback control loop is first from rectifier bridge outlet side sampling average anode current and output voltage, through multiplier, obtain power output signal, input signal as MPPT controller, and control according to inputted power signal, export a variable level signal to control voltage controlled oscillator VCO, VCO is according to the sine wave of the amplitude output corresponding frequencies of input voltage, through trigger, form a series of ON time ton constant, cycle T (frequency) is with the square wave of sinusoidal wave synchronous change, realizing PFM controls, break-make finally by the amplifying circuit control switch pipe of overdriving.The algorithm of MPPT controller adopts " climbing method " (to claim again to disturb and observation P& O), by comparing of the power output of this collection and last time being determined increase or reduce output voltage, realize MPPT.If Δ P o> 0, illustrates that power output does not reach maximum, continues to increase output voltage and follows the tracks of; If Δ P o< 0, and situation is just in time contrary, until Δ P o=0, now, the power output of wind-driven generator is in maximum power point.
The pulse frequency that rectification side adopts is controlled (PFM) technology, its control principle block diagram as shown in Figure 3, MPPT(Maximum power point tracking) refer to and can detect in real time output voltage, current value by maximal power tracing controller, and follow the trail of maximum power output value (Po); VCO(Voltage-controlled Oscillator) be voltage controlled oscillator, its frequency of oscillation is controlled by input voltage (be also maximal power tracing controller output), and the control by MPPT unit can regulate in real time to its frequency of oscillation.Therefore whole feedback control loop is first from rectifier bridge outlet side sampling average anode current and output voltage, through multiplier, obtain power output signal, through MPPT controller, follow the tracks of maximum power point, and export a variable level signal to control voltage controlled oscillator VCO, VCO is according to the sine wave of the amplitude output corresponding frequencies of input voltage, through trigger, form a series of ON time ton constant, cycle T (frequency) is with the square wave of sinusoidal wave synchronous change, realize PFM and control, finally by the break-make of the amplifying circuit control switch pipe of overdriving.
This rectification circuit can be realized the three-phase active power factor of single switching tube and proofread and correct (APFC) function, also can realize BOOST type maximal power tracing (MPPT) controller function simultaneously, has realized multiplexing on same circuit of two kinds of functions.Wherein, this circuit is constant by control switch pipe ON time, has realized the three-phase active power factor of single switching tube and has proofreaied and correct (APFC) function, has guaranteed inductive current peak envelope sineization, thereby has improved electric power generation efficiency and useful life.The difference of this circuit and traditional three-phase APFC is: before the former limit of instrument transformer inductance (energy storage inductor) is placed in rectifier diode; Formed single switching tube structure; Integrated MPPT function; There is multiplication of voltage effect.The difference of this circuit and traditional MPPT controller is: integrated AFPC function, energy storage inductor position, before rectifier diode, has voltage multiplying rectifier effect.
Compared with prior art, beneficial effect of the present invention and advantage are:
1, this main circuit circuit adopts not controlled bridge-type rectification circuit to combine with BOOST booster circuit, and input side current first harmonics presents sine wave, and power factor is high, and simultaneously single switch is controlled simple, and cost is lower.The every inductance (the former limit of instrument transformer inductance) that increases mutually of input side forms Active Power Factor Correction Converter.Rectification side A phase input current waveform, input voltage waveform are as shown in Figure 6.Can find out that input current is interrupted, its envelope is sinusoidal, and with output electrical network same-phase, realized unity power factor control, the more traditional uncontrollable rectifier of rectifying part efficiency improves a lot.
2, the present invention increases an inverse-excitation type voltage-multiplying circuit at the input side of each phase, each can produce an output voltage mutually, the gain of voltage is relevant with the turn ratio of instrument transformer, by the output capacitance series connection of each phase, total output voltage is represented by three-phase output capacitance voltage and main circuit output capacitance voltage sum, greatly improves the amplitude of output voltage.Therefore this circuit can be lower at wind speed, still can export higher direct voltage for next stage in the lower situation of blower fan output three-phase voltage.Rectifier output voltage waveform as shown in Figure 7.
In sum, a kind of grid-connected converter that is applied to small-sized wind power generator disclosed by the invention, can directly flow to electrical network by the alternating current process unsteady flow effect of the amplitude of wind-driven generator output, frequency change during work and use.Input current is the advantage such as sinusoidal wave, output current ripple is less, can normally use under the more high and low wind speed of transducer effciency and high wind speed.In a word, no matter for electrical network or blower fan system, the present invention has positive application value.

Claims (2)

1. three-phase inverse-excitation type multiplication of voltage list switch rectifying circuit for a small-size wind power-generating, it is characterized in that, this circuit sequentially comprises three-phase alternating-current supply, filter capacitor C1, C2, C3, triphase single-switch BOOST rectification circuit, three inverse-excitation type voltage-multiplying circuits, signal acquisition circuit and control circuits according to input, output; Wherein:
Described three-phase alternating-current supply input side is connected with the output of wind-driven generator three-phase;
Described triphase single-switch BOOST rectification circuit, comprises uncontrollable rectifier bridge and BOOST booster circuit, and described uncontrollable rectifier bridge is comprised of 6 diode D1~D6; Described BOOST booster circuit is comprised of BOOST inductance, triphase single-switch VT, diode D7 and the DC capacitor Co of instrument transformer T1, T2, T3, and BOOST inductance is serially connected in rectifier bridge and exchanges input side, and each is connected in series a BOOST inductance mutually; In described triphase single-switch BOOST rectification circuit, the outlet side of uncontrollable rectifier bridge single switch direct and BOOST rectification circuit links together; Described control circuit carries out on/off control to the single switch VT in rectification side BOOST circuit, make rectification input side current waveform level off to sine wave, to realize unity power factor control, the MPPT maximum power point tracking in PFM control is simultaneously controlled and is made working point remain on little blower fan maximum power place;
Described inverse-excitation type voltage-multiplying circuit, comprises reverse coupled inductance T1, storage capacitor Ca, switching capacity C11, C12 and diode Da, D11, D12; Wherein: diode Da, switching capacity C11, coupling inductance secondary, switching capacity C12, storage capacitor Ca, loop in series; Diode D11 is in parallel with switching capacity C11 and coupling inductance secondary; Diode D12 is in parallel with coupling inductance secondary and switching capacity C12;
When switching tube VT conducting, in three-phase any one mutually in, by the former limit of instrument transformer T1, uncontrollable rectifier bridge, switching tube VT, form loop, this phase power supply is to the former limit of T1 induction charging, Current rise; In this while instrument transformer secondary inductance, by diode D11 and diode D12, charge respectively to switching capacity C11 and switching capacity C12, capacitor C 11, C12 voltage rise; When switching tube VT turn-offs, this one forms loop by power supply, the former limit of instrument transformer T1 inductance, uncontrollable rectifier bridge, diode D7, main circuit output capacitance Co in mutually, now, this phase power supply and the former limit of T1 inductance are jointly to output capacitance Co charging, and a phase input current reduces; Now, instrument transformer T1 secondary current is reverse, diode Da conducting, and instrument transformer T1 secondary, switching capacity C11, C12 is jointly to the output capacitance Ca charging of this phase voltage-multiplying circuit, and the voltage of capacitor C a raises; By the output capacitance Ca of three-phase voltage-multiplying circuit, Cb, Cc and main circuit output capacitance Co series connection, the output voltage of whole triphase single-switch BOOST-voltage doubling rectifing circuit is the output capacitance Ca of three-phase voltage-multiplying circuit, Cb, voltage sum on Cc and main circuit output capacitance Co, thus rectifier output voltage is improved.
2. three-phase inverse-excitation type multiplication of voltage list switch rectifying circuit for small-size wind power-generating as claimed in claim 1, it is characterized in that, described control circuit rectification side adopts pulse frequency to control PFM technology, comprise multiplier, MPPT controller, voltage controlled oscillator VCO, trigger and a driving amplifier, its course of work is: first whole feedback control loop is first from rectifier bridge outlet side sampling average anode current and output voltage, through multiplier, obtain power output signal, input signal as MPPT controller, and control according to inputted power signal, export a variable level signal to control voltage controlled oscillator VCO, VCO is according to the sine wave of the amplitude output corresponding frequencies of input voltage, through trigger, form a series of ON time ton constant, cycle T is with the square wave of sinusoidal wave synchronous change, realizing PFM controls, break-make finally by the amplifying circuit control switch pipe of overdriving, the algorithm of MPPT controller adopts " climbing method " P& O, realizes MPPT by comparing of the power output of this collection and last time being determined increase or reduce output voltage, Δ P o> 0, illustrates that power output does not reach maximum, continues to increase output voltage and follows the tracks of, if Δ P o< 0, and situation is just in time contrary, until Δ P o=0, now, the power output of wind-driven generator is in maximum power point.
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CN105680470A (en) * 2015-11-02 2016-06-15 国网天津市电力公司 Wind power generation system and energy management control method capable of adapting tosmall-sized wind field characteristics
CN107959413A (en) * 2017-11-22 2018-04-24 西安电子科技大学 A kind of low high pressure converted power supply of integrated circuit
CN111193428A (en) * 2020-01-20 2020-05-22 南京理工大学 Micro high-frequency grouping pulse power supply

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