CN103401267A - Grid-connected circuit for small-sized wind-driven generator - Google Patents
Grid-connected circuit for small-sized wind-driven generator Download PDFInfo
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Abstract
The invention discloses a grid-connected circuit for a small-sized wind-driven generator. According to the grid-connected circuit for the small-sized wind-driven generator, an alternating current input side is connected with a three-phase output of the wind-driven generator through a three-phase single-switch BOOST rectification circuit, and the three-phase output of the wind-driven generator is connected with a three-phase capacitor; a rectification output side is directly connected with the three-phase single-switch BOOST rectification circuit, and the rectification circuit simultaneously has the functions of active power factor correction and maximum power tracking control; an inversion side is connected with a power grid by adopting a voltage type single-phase interleaved parallel inversion circuit; signal sampling circuits are divided into a voltage signal acquisition circuit and a current signal acquisition circuit, and the voltage signal acquisition circuit respectively acquires direct current voltage output by a rectification side, direct current voltage input by the inversion side and alternating current voltage of the power grid in real time; the current signal acquisition circuit respectively acquires direct current output by the rectification side and current output to the power grid by the inversion side in real time, namely grid-connected current signals; and a control circuit respectively controls switching tubes in the three-phase single-switch BOOST rectification circuit and the voltage type single-phase interleaved parallel inversion circuit.
Description
Technical field
The present invention relates to little blower fan translation circuit technical field, particularly a kind of small-sized wind power generator parallel network circuit.
Background technology
Wind energy is a kind of novel regenerative resource, can effectively alleviate the mankind's Pressure on Energy and ambient pressure, therefore, the research of wind generating technology has been subjected to increasing attention, and the small-size wind power-generating technology is one of them hot research direction.Small-sized wind power generator refers to that generated output is at 10kW and following wind-driven generator thereof.Due to the randomness of wind energy, the voltage of the electric energy that wind-driven generator sends and frequency are not what fix, for high-quality, available electric energy are provided, must between little blower fan and electrical network or load, adopt power transformation circuit.Little blower fan translation circuit mainly is comprised of rectification and two parts of inversion, traditional translation circuit adopts the uncontrollable rectification of three-phase and voltage-type single-phase bridge inverter circuit, although traditional translation circuit is simple in structure, technology maturation, but it has that conversion efficiency is low, the distortion of rectification side input current waveform is serious, performance of dynamic tracking and the shortcomings such as stability is poor, low wind speed and high wind speed cisco unity malfunction.
development along with power electronic technology, problem to the past has had new solution, but in the rectification side, adopt three-phase PWM (pulse-width modulation) rectification circuit often, the diode that is about in control rectifying circuit not is changed to IGBT(insulated gate bipolar crystal) pipe, and the break-make of employing PWM technology control switch pipe, after output voltage feedback for the size of power ratio control switch pulsewidth, its structured flowchart as shown in Figure 1, electric power output voltage Uo and la tension de reference Uref est are relatively amplified, obtain error signal Ue, by itself and triangular signal Ur relatively after, the PWM comparator is with regard to the certain series of pulses of output duty cycle, the principle of Here it is voltage-controlled type.After the rectification of PWM rectification circuit, can obtain comparatively desirable rectified wave, but the high cost of circuit meanwhile, actual gain and cost are disproportionate, and control complicatedly, and system reliability reduces.The inversion side remains unchanged, and still adopts the voltage-type single phase bridge type rectifier circu.
Traditional inverter circuit is controlled the same SPWM(of employing sinusoidal pulse width modulation) control, it is a two closed-loop control, outer shroud adopts Voltage loop to control, its output is as the given value of current signal of current inner loop, current inner loop is the control inputs electric current, make its quick follow current instruction, under synchronous coordinate system, can realize that the floating of electric current is followed the tracks of and the fast current response.
According to the problems referred to above, for the requirements at the higher level of small-size wind power-generating conversion electric current, need that the research performance is better to have broad application prospects and the converter topology structure of practical value.
Summary of the invention
The invention provides a kind of small-sized wind power generator parallel network circuit, this invention has improved the efficiency of wind-driven generator, overload capacity and the inversion efficiency of combining inverter, and has reduced the output current ripple of combining inverter, and is described below:
A kind of small-sized wind power generator parallel network circuit, described parallel network circuit comprises: three phase capacitance C1, triphase single-switch BOOST rectification circuit, the single-phase staggered parallel inverter circuit of voltage-type, signal acquisition circuit and control circuit,
Exchange input side and be connected with the output of wind-driven generator three-phase by described triphase single-switch BOOST rectification circuit, and the output of the three-phase of wind-driven generator meets described three phase capacitance C1; The rectification outlet side directly links together with described BOOST booster circuit; Inversion is surveyed and is adopted the single-phase staggered parallel inverter circuit of described voltage-type, connects electrical network;
Described signal sample circuit is two kinds of divided voltage signal Acquisition Circuit and current signal Acquisition Circuit again, and described voltage signal acquisition circuit is the direct voltage, direct voltage, the grid ac voltage of inversion side input of the output of Real-time Collection rectification side respectively; The current signal Acquisition Circuit adopts the direct current of Real-time Collection rectification side output respectively and the output current signal that the inversion side exports electrical network to;
Described control circuit is controlled the switching tube in described triphase single-switch BOOST rectification circuit and the single-phase staggered parallel inverter circuit of described voltage-type respectively.
Described triphase single-switch BOOST rectification circuit comprises: the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, the 6th diode D6, inductive bank L1, the 7th switching tube VT7, the 7th diode D7 and DC capacitor C2
The negative electrode of described the 4th diode D4 of the anodic bonding of described the first diode D1, the negative electrode of described the 6th diode D6 of the anodic bonding of described the 3rd diode D3, the negative electrode of described the second diode D2 of the anodic bonding of described the 5th diode D5;
Described three pole reactor L1 mono-end connects respectively described wind-driven generator and described three phase capacitance C1, the other end connects described the first diode D1, described the 3rd diode D3 and described the 5th diode D5, and the two ends of described the 7th switching tube VT7 connect respectively described the 7th diode D7 and described DC capacitor C2.
The single-phase staggered parallel circuits of described voltage-type is comprised of the first switching tube VT1, second switch pipe VT2, the 3rd switching tube VT3, the 4th switching tube VT4, the 5th switching tube VT5 and the 6th switching tube VT6, the second inductance L 2, the three inductance L 3,
Described the first switching tube VT1, described the 4th switching tube VT4 place brachium pontis and described the 5th switching tube VT5, described second switch pipe VT2 place brachium pontis form first via single-phase bridge inverter circuit; Simultaneously, described the 3rd switching tube VT3, described the 6th switching tube VT6 place brachium pontis and described the 5th switching tube VT5, described second switch pipe VT2 place brachium pontis form the second road single-phase bridge inverter circuit; Described first via single-phase bridge inverter circuit connects described the 3rd inductance, and described the second road single-phase bridge inverter circuit connects described the second inductance.
Described control circuit comprises: rectification side control circuit, described rectification side control circuit is by multiplier, maximal power tracing controller |, voltage controlled oscillator, trigger and driving amplifier form,
The direct voltage of output and direct current obtain the power output signal through described multiplier, input signal as described maximal power tracing controller, described maximal power tracing controller output one variable level signal is to control described voltage controlled oscillator, described voltage controlled oscillator is according to the sine wave of the amplitude output corresponding frequencies of input voltage, through described trigger, form a series of ON time constant, the square wave that cycle synchronously changes with sine wave, finally by the break-make of crossing described driving amplifier control switch pipe.
The triphase single-switch BOOST rectification circuit of the present invention's design namely can be realized three-phase active power factor correction (APFC) function of single switching tube, simultaneously also can realize BOOST type maximal power tracing (MPPT) controller function, realize multiplexing on the same circuit of two kinds of functions.Wherein, this circuit is constant by control switch pipe ON time, has realized that the three-phase active power factor of single switching tube is 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 energy storage inductor is placed in rectifier diode; Formed single switching tube structure; And integrated MPPT function.The difference of this circuit and traditional MPPT controller is: integrated AFPC function, the energy storage inductor position is before rectifier diode.
Described control circuit comprises: inversion side control circuit, and described inversion side control circuit is comprised of 2 comparators, 2 adjusters, multiplier, PWM generator and sequential control circuits,
Input side direct voltage and voltage given value compare, and through described adjuster, as the input of described multiplier, another road signal of described multiplier is through the phase-locked mains voltage signal of phase-locked loop, and its amplitude is 1; Through described multiplier effect, obtain and the synchronous current signal of line voltage, and given as electric current loop, with output current, make comparisons, after regulating, another adjuster produces pwm control signal by described PWM generator, described sequential control circuit is adjusted the sequential of described pwm control signal, control switch pipe break-make, realize the reversion reaction of crisscross parallel.
The beneficial effect of technical scheme provided by the invention is: this circuit is owing to adopting triphase single-switch BOOST rectification circuit, and the input side current first harmonics presents sine wave, and power factor is high, and Simultaneous Switching management and control system is simple, and cost is lower.Input side increases by three inductance and forms Active Power Factor Correction Converter, and can consider to use the motor stator winding stray inductance to replace input side BOOST inductance, further reduces costs.Adopt MPPT to control, can realize maximal power tracing control, detect in real time output voltage, current value, working point is near the maximum power output value, improve the utilance of wind energy.In addition, owing to adopting maximal power tracing, can improve collection of energy and transmittability under low wind speed.In the present invention, the inversion side adopts single-phase bridge paralleling and interleaving inverter circuit, the control signal of two crisscross parallel branch roads differs half period, the current waveform of two-way is identical, phase phasic difference 180 degree, the two paths of signals formation output current signal that is superimposed, ripple is cancelled out each other, and has effectively reduced current ripples, has improved inversion efficiency.This translation circuit is due to the characteristics such as have that efficiency is higher, overload capacity is strong, reliability is strong and current ripples is little, is suitable for very much wind speed lower, and collection of energy difficulty or wind speed are higher, and overload capacity is required to use in high situation.
The accompanying drawing explanation
Fig. 1 is voltage-controlled type Switching Power Supply structured flowchart;
Fig. 2 is the grid-connected changer system structure chart that is applied to small-sized wind power generator;
Fig. 3 is rectification lateral circuit schematic diagram, adopts triphase single-switch boost rectification circuit;
Fig. 4 is inversion lateral circuit schematic diagram, adopts voltage-type single-phase bridge crisscross parallel inverter circuit;
Fig. 5 is the structured flowchart of rectification side control system;
Fig. 6 is inversion side control system block diagram;
Fig. 7 is rectification side input current, input voltage waveform figure;
Fig. 8 is inversion side output current wave figure.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
In order to increase work efficiency, overload capacity and inversion efficiency, and reduce output current ripple, the embodiment of the present invention provides a kind of small-sized wind power generator parallel network circuit, this circuit adopts triphase single-switch BOOST rectification circuit in the rectification side, at generator three-phase outlet side, often increase mutually an inductance, by the switch of controlling the MOSFET pipe in triphase single-switch BOOST rectification circuit, make input current roughly present sine waveform, improve the efficiency of circuit.The inversion side adopts single-phase crisscross parallel bridge rectifier, the two-way of crisscross parallel output is superimposed, to reach the minimizing current ripples, to reach, improves overload capacity, reduce output current ripple and improve the purpose of inversion efficiency, referring to Fig. 2, Fig. 3 and Fig. 4, described below:
This small-sized wind power generator parallel network circuit comprises: three phase capacitance C1, rectification lateral circuit adopt triphase single-switch BOOST rectification circuit, inversion side to adopt the single-phase staggered parallel inverter circuit of voltage-type, also comprise signal acquisition circuit and control circuit,
Referring to Fig. 3, this triphase single-switch BOOST rectification circuit is by 6 diodes (the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5 and the 6th diode D6, the negative electrode of the anodic bonding of the first diode D1 the 4th diode D4, the negative electrode of the anodic bonding of the 3rd diode D3 the 6th diode D6, the negative electrode of anodic bonding the second diode D2 of the 5th diode D5), i.e. the first inductance of inductive bank L1(), the 7th switching tube VT7(MOSFET pipe), the 7th diode D7 and DC capacitor C2 form.
Exchange input side and be connected with the output of wind-driven generator three-phase by three pole reactor L1, and the output of the three-phase of wind-driven generator meets three phase capacitance C1; The rectification outlet side directly and switching tube VT7 link together.The effect of rectifier bridge is that the three-phase alternating current electric rectification that the frequency of wind-driven generator output is constantly changed is direct current.
Inductive bank L1 does not directly join with the 7th switching tube VT7 place, but is serially connected in the interchange input side, and each is connected in series a same model inductance mutually.That is: three pole reactor L1 mono-end connects respectively wind-driven generator and three phase capacitance C1, the other end connects uncontrollable rectifier bridge, and (the first-phase inductance connects respectively the anode of the first diode D1 and the negative electrode of the 4th diode D4, the second-phase inductance connects respectively the anode of the 3rd diode D3 and the negative electrode of the 6th diode D6, the third phase inductance connects respectively the anode of the 5th diode D5 and the negative electrode of the second diode D2), the two ends of the 7th switching tube VT7 connect respectively the 7th diode D7 and DC capacitor C2.By adopting the PFM(pulse frequency modulated) technology control the 7th switching tube VT7 break-make, make rectification input side current waveform level off to sine wave, to realize unity power factor control, MPPT maximum power point tracking in PFM control is simultaneously controlled (MPPT) makes working point remain on little blower fan maximum power place, has tracking performance preferably.While namely working, due to the switching frequency of the 7th switching tube VT7 frequency much larger than the wind-driven generator output voltage, so in the one-period of triphase single-switch BOOST rectification circuit normal operation, input voltage can be regarded a steady state value as.Situation take input voltage greater than zero time is as example, when the 7th switching tube VT7 opens, and the loop that generator output three-phase alternating current forms through three pole reactor L1, uncontrollable rectifier bridge and switching tube VT7, and charge to three pole reactor L1; When the 7th switching tube VT7 disconnects, through three pole reactor L1, uncontrollable rectifier bridge, the 7th diode D7 and DC capacitor C2, form loop, by wind-driven generator and three pole reactor L1, jointly to DC capacitor C2, carry out charging pressure-boosting, output DC, and as the DC input voitage of inversion side.
Referring to Fig. 4, the single-phase staggered parallel circuits of voltage-type is on the basis of traditional single phase bridge inverter main circuit, increase by a road, composition is with the single-phase bridge inverter circuit of crisscross parallel branch road, namely by switching tube VT1-VT6(i.e. the first switching tube VT1, second switch pipe VT2, the 3rd switching tube VT3, the 4th switching tube VT4, the 5th switching tube VT5 and the 6th switching tube VT6), the second inductance L 2, the three inductance L 3 form.The first switching tube VT1, the 4th switching tube VT4 place brachium pontis and the 5th switching tube VT5, second switch pipe VT2 place brachium pontis form first via single-phase bridge inverter circuit; Simultaneously, the 3rd switching tube VT3, the 6th switching tube VT6 place brachium pontis and the 5th switching tube VT5, second switch pipe VT2 place brachium pontis form the second road single-phase bridge inverter circuit, first via single-phase bridge inverter circuit and the second road single-phase bridge inverter circuit form the crisscross parallel circuit, and on two branch roads of crisscross parallel, respectively increase an inductance L 2, L3 as current-limiting inductance (be that first via single-phase bridge inverter circuit connects the 3rd inductance, the second road single-phase bridge inverter circuit connects the second inductance).On crisscross parallel two branch roads the cycle of switching tube identical with duty ratio, opens and constantly lag behind the regular hour successively, thereby the electric current that each branch road is flow through is staggered, the current ripples in two branch roads is cancelled out each other, to reduce current ripples.
Signal sample circuit is two kinds of divided voltage signal Acquisition Circuit and current signal Acquisition Circuit again.The voltage signal acquisition circuit is Real-time Collection rectification side rectifier bridge output dc voltage, inversion side input direct voltage, grid ac voltage respectively.The current signal Acquisition Circuit adopts the direct current of Real-time Collection rectification side rectifier bridge output respectively and the output current signal that the inversion side exports electrical network to.
Control circuit is divided into two parts, to 6 switching tube VT1-VT6 of the 7th switching tube VT7 in triphase single-switch BOOST rectification circuit and inversion side, controls respectively i.e. rectification side control circuit and inversion side control circuit.
Referring to Fig. 5, triphase single-switch BOOST rectification circuit adopts pulse frequency to control (PFM) technology, comprises a multiplier, MPPT(Maximum power point tracking) controller |, voltage controlled oscillator VCO (Voltage-controlled Oscillator), trigger and a driving amplifier.
MPPT refers to the maximal power tracing controller, can detect in real time output voltage, current value, and follows the trail of the controller of maximum power output value Po |; The frequency of oscillation of voltage controlled oscillator VCO is controlled by input voltage (being also the output of maximal power tracing controller), by the control of MPPT unit, can regulate in real time its frequency of oscillation.
its course of work is: at first whole feedback control loop is first from rectifier bridge outlet side sampling average anode current and output voltage, through multiplier, obtain the power output signal, input signal as the MPPT controller, and control according to the power signal of inputting, 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 that 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), comparing by the power output by this collection and last time determined to increase or reduce output voltage to realize MPPT.If Δ Po > 0, illustrate that power output does not reach maximum, continue to increase output voltage and follow the tracks of; If Δ Po<0, situation is just in time opposite, until Δ Po=0, at this moment, the power output of wind-driven generator is in maximum power point.
The triphase single-switch BOOST rectification circuit of the present invention's design namely can be realized three-phase active power factor correction (APFC) function of single switching tube, simultaneously also can realize BOOST type maximal power tracing (MPPT) controller function, realize multiplexing on the same circuit of two kinds of functions.Wherein, this circuit is constant by control switch pipe ON time, has realized that the three-phase active power factor of single switching tube is 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 energy storage inductor is placed in rectifier diode; Formed single switching tube structure; And integrated MPPT function.The difference of this circuit and traditional MPPT controller is: integrated AFPC function, the energy storage inductor position is before rectifier diode.
Referring to Fig. 6, in the present invention, inversion side control circuit adopts voltage and current double closed-loop SPWM to control, comprise: 2 comparators, 2 pi regulators, multiplier, PWM generator, sequential control circuit, need the voltage and current signal in the Real-time Collection circuit, comprise inverter input side direct voltage, electric network voltage phase and inverter outlet side alternating current.Outer shroud adopts Voltage loop to control, and the input side direct voltage and the voltage given value that collect are compared, and through pi regulator, as the input of multiplier, another road signal of multiplier is through the phase-locked mains voltage signal of phase-locked loop, and its amplitude is 1.Effect obtains and the synchronous current signal of line voltage through multiplier for both, and given as electric current loop, with output current, make comparisons, after regulating, PI produces pwm control signal by PWM generator, control switch pipe break-make, realize the reversion reaction of crisscross parallel.Sequential control circuit is used for adjusting PWM and controls sequential, and the control signal of a branch road in crisscross parallel, through postponing 180 degree phase angles, is obtained to the control signal of the other branch road of crisscross parallel.With tradition, control and compare, difference is, in circuit, has increased the brachium pontis that is comprised of two switching tubes, and the control signal that forms two brachium pontis of crisscross parallel differs 180 degree on phase place, thereby has realized crisscross parallel control.
Referring to Fig. 7, by above-mentioned control, can find out that input current is interrupted, its envelope is sinusoidal, input current average value is sinusoidal variations, and with output electrical network same-phase, realized unity power factor control, rectifying part efficiency improves a lot than traditional scheme.Referring to Fig. 8, simultaneously, due to reducing of current ripples, the magnetic core size of inductance can further dwindle.The ripple current of input capacitance weakens simultaneously.
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 effect of the alternating current of the amplitude of wind-driven generator output, frequency change process unsteady flow during work and use.Input current is the advantage such as sinusoidal wave, that 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.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a small-sized wind power generator parallel network circuit, is characterized in that, described parallel network circuit comprises: three phase capacitance C1, triphase single-switch BOOST rectification circuit, the single-phase staggered parallel inverter circuit of voltage-type, signal acquisition circuit and control circuit,
Exchange input side and be connected with the output of wind-driven generator three-phase by described triphase single-switch BOOST rectification circuit, and the output of the three-phase of wind-driven generator meets described three phase capacitance C1; The rectification outlet side directly links together with described triphase single-switch BOOST rectification circuit; Inversion is surveyed and is adopted the single-phase staggered parallel inverter circuit of described voltage-type, connects electrical network;
Described signal sample circuit is two kinds of divided voltage signal Acquisition Circuit and current signal Acquisition Circuit again, and described voltage signal acquisition circuit is the direct voltage, direct voltage, the grid ac voltage of inversion side input of the output of Real-time Collection rectification side respectively; The current signal Acquisition Circuit adopts the direct current of Real-time Collection rectification side output respectively and the output current signal that the inversion side exports electrical network to;
Described control circuit is controlled the switching tube in described triphase single-switch BOOST rectification circuit and the single-phase staggered parallel inverter circuit of described voltage-type respectively.
2. a kind of small-sized wind power generator parallel network circuit according to claim 1, it is characterized in that, described triphase single-switch BOOST rectification circuit comprises: the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, the 6th diode D6, inductive bank L1, the 7th switching tube VT7, the 7th diode D7 and DC capacitor C2
The negative electrode of described the 4th diode D4 of the anodic bonding of described the first diode D1, the negative electrode of described the 6th diode D6 of the anodic bonding of described the 3rd diode D3, the negative electrode of described the second diode D2 of the anodic bonding of described the 5th diode D5;
Described three pole reactor L1 mono-end connects respectively described wind-driven generator and described three phase capacitance C1, the other end connects the anode of described the first diode D1, described the 3rd diode D3 and described the 5th diode D5, and the two ends of described the 7th switching tube VT7 connect respectively described the 7th diode D7 and described DC capacitor C2.
3. a kind of small-sized wind power generator parallel network circuit according to claim 1, it is characterized in that, the single-phase staggered parallel circuits of described voltage-type is by the first switching tube VT1, second switch pipe VT2, the 3rd switching tube VT3, the 4th switching tube VT4, the 5th switching tube VT5 and the 6th switching tube VT6, the second inductance L 2, the 3rd inductance L 3 forms
Described the first switching tube VT1, described the 4th switching tube VT4 place brachium pontis and described the 5th switching tube VT5, described second switch pipe VT2 place brachium pontis form first via single-phase bridge inverter circuit; Simultaneously, described the 3rd switching tube VT3, described the 6th switching tube VT6 place brachium pontis and described the 5th switching tube VT5, described second switch pipe VT2 place brachium pontis form the second road single-phase bridge inverter circuit; Described first via single-phase bridge inverter circuit connects described the 3rd inductance, and described the second road single-phase bridge inverter circuit connects described the second inductance.
4. a kind of small-sized wind power generator parallel network circuit according to claim 1, it is characterized in that, described control circuit comprises: rectification side control circuit, described rectification side control circuit is comprised of multiplier, maximal power tracing controller, voltage controlled oscillator, trigger and driving amplifier
The direct voltage of output and direct current obtain the power output signal through described multiplier, input signal as described maximal power tracing controller, described maximal power tracing controller output one variable level signal is to control described voltage controlled oscillator, described voltage controlled oscillator is according to the sine wave of the amplitude output corresponding frequencies of input voltage, through described trigger, form a series of ON time constant, the square wave that cycle synchronously changes with sine wave, finally by the break-make of crossing described driving amplifier control switch pipe.
5. a kind of small-sized wind power generator parallel network circuit according to claim 1, it is characterized in that, described control circuit comprises: inversion side control circuit, described inversion side control circuit is comprised of 2 comparators, 2 adjusters, multiplier, PWM generator and sequential control circuits
Input side direct voltage and voltage given value compare, and through described adjuster, as the input of described multiplier, another road signal of described multiplier is through the phase-locked mains voltage signal of phase-locked loop, and its amplitude is 1; Through described multiplier effect, obtain and the synchronous current signal of line voltage, and given as electric current loop, with output current, make comparisons, after regulating, another adjuster produces pwm control signal by described PWM generator, described sequential control circuit is adjusted the sequential of described pwm control signal, control switch pipe break-make, realize the reversion reaction of crisscross parallel.
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| CN104377734A (en) * | 2014-11-28 | 2015-02-25 | 东元总合科技（杭州）有限公司 | Draught fan electric power converter with real-time electricity generating and full-time grid connecting functions |
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| US11012002B1 (en) | 2017-04-13 | 2021-05-18 | University Of New Brunswick | Single-phase voltage source inverter circuit with power decoupling, and control methods |
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| CN112803790A (en) * | 2019-11-13 | 2021-05-14 | 北京金风科创风电设备有限公司 | Control method and controller of converter |
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