CN101640423A - Generator system for wind power generation and variable speed control method - Google Patents
Generator system for wind power generation and variable speed control method Download PDFInfo
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- CN101640423A CN101640423A CN200910023819A CN200910023819A CN101640423A CN 101640423 A CN101640423 A CN 101640423A CN 200910023819 A CN200910023819 A CN 200910023819A CN 200910023819 A CN200910023819 A CN 200910023819A CN 101640423 A CN101640423 A CN 101640423A
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Abstract
The invention discloses a generator system for wind power generation and a variable speed control method; the system comprises a permanent magnetic synchronous generator of which the electrical energyoutput is connected with a Vienna rectifier device, and is characterized in that a stator winding of the permanent magnetic synchronous generator comprises two sets of triphase windings with electrical degree difference of 180 degrees and unconnected neutral points thereof; the Vienna rectifier device comprises two Vienna rectifiers with identical structure, which are in parallel connection withthe DC side with a central point O connected with a DC bus capacitance midpoint; the AC side is connected with the two triphase windings of the generator respectively; a Boost inductance of the Viennarectifier is directly provided by the leakage inductance of the windings of the generator; each Vienna rectifier device is controlled by a DSP controller to maintain the balance of the DC bus voltageby the phase current and line voltage collected in the AC side and the bus voltage collected in the DC side; and the variable speed control of the generator is realized by collecting the rotating speed of a fan and the current wind speed.
Description
Technical field
The present invention relates to a kind of generator system and shifting control method, particularly a kind of electricity generation system and shifting control method that is used for wind power generation based on 6 phase magneto alternators.
Background technology
In the directly driven wind-powered system of MW class large power, generator is generally three phase electric machine, and the lower 690V of the frequent employing of outlet electric pressure, because very big stator current, design for generator unit stator side full power convertor is disadvantageous, and wherein harmonic wave and efficient are two important problem.Conventional technical scheme is to adopt many arteries and veins diode rectification scheme (for example 12 arteries and veins rectifications), perhaps adopts two level PWM rectifier parallel connections to share capacity.These two kinds of schemes, the former needs the misphase transformer, and diode rectification can produce bigger harmonic current to generator, causes torque pulsation and the problem that the motor feels hot; Though latter's harmonic performance is better, under high-power condition, two level rectifier parallel connections are the not high ways of a kind of efficient.By contrast, many level current transformers have higher efficient and more superior harmonic performance, but have the problem of capacitance voltage Balance Control.
Summary of the invention
The purpose of this invention is to provide a kind of electricity generation system and shifting control method that connects the topological project of Vienna rectifier in parallel based on 6 phase magneto alternators, in order to diode rectification scheme and the two level current transformers scheme in parallel that substitutes 3 traditional phase magneto alternators, parallel connection combination and speed Control by Vienna three level rectifiers, not only can overcome the pulsation of three-level current transformer electric capacity neutral point voltage balance and third harmonic voltage, and its efficient is higher than traditional two level rectifier efficient.
For reaching above purpose, the present invention takes following technical scheme to be achieved:
A kind of generator system that is used for wind power generation, comprise a magneto alternator, the power input of this magneto alternator connects blower fan, electric energy output connects a Vienna rectifier unit, to realize the conversion of mechanical energy to electric energy, the Vienna rectifier unit is realized electric energy AC-DC conversion, realizes the variable-speed operation control of blower fan simultaneously, and its output links to each other with a combining inverter; This combining inverter will feed electric energy into electrical network by step-up transformer, it is characterized in that, the stator of described magneto alternator adopts 6 designs mutually, be that stator winding is to be made of two I three phase windings and II three phase windings that overlap 180 ° of electrical degrees of mutual deviations, the neutral points of two covers, three phase windings do not link to each other; Described Vienna rectifier unit comprises two I Vienna rectifier and IIVienna rectifiers that structure is identical, these two three level Vienna rectifiers are at DC side parallel, its central point O is connected to public dc-link capacitance mid point, and IVienna rectifier AC side connects generator I three phase windings; II Vienna rectifier AC side connects II three phase windings of generator; The Boost inductance of Vienna rectifier is directly provided by the leakage inductance of generator windings; Described Vienna rectifier unit also comprises a dsp controller, the output signal of this dsp controller links to each other with the input control end of II Vienna rectifier with I, the balance that the phase current by each Vienna rectifier AC side collection and the busbar voltage of line voltage and DC side collection are controlled the current phasor of two Vienna rectifiers and kept DC bus-bar voltage; And the rotation speed of fan measured value by gathering the generator power intake and the current wind speed speed Control that realizes generator.
In the such scheme, described dsp controller output links to each other with the input control end of II Vienna rectifier with I by a Drive Protecting Circuit respectively.
A kind of generator system based on above-mentioned wind power generation is realized the method for generator speed Control, comprises the steps:
(1) with the rotary speed setting value n of blower fan
*Ask poor with current tachometer value n, obtain the desired value i of active current behind the pi regulator in its deviation process dsp controller
d *And i '
d *, and the desired value i of reactive current
q *And i '
q *Then all be set to 0, described electric current desired value i
d *And i '
d *, i
q *And i '
q *Be respectively applied in two identical I current controllers of DSP and the II current controller, simultaneously with I Vienna rectifier AC side phase current i
a, i
bWith line voltage u
Ab, IIVienna rectifier AC side phase current i
a', i
b' and line voltage u
Ab' be input to I current controller and II current controller respectively;
(2) I, II current controller carry out the Current Vector Control of stator voltage vector oriented, the modulation degree m of the control voltage vector of output and the phase theta of m ' and voltage vector
iAnd θ '
i, convert pwm control signal Gate1 and Gate2 to by I space vector modulation device and II space vector modulation device respectively, control the work of the switching circuit in I, the IIVienna rectifier respectively; Realize the speed Control of magneto alternator;
(3) with DC bus-bar voltage V
DC1/2 and electric capacity mid-point voltage V
DC1Ask poor, its deviation is delivered to the duty ratio that I space vector modulation device is used to revise the redundant vector of modulator through the output of the proportional controller g in a dsp controller normalized factor alpha (1≤α≤1); Realize the balance of dc bus capacitor mid-point voltage.
In the said method, described rotary speed setting value n
*Power characteristic by current wind speed and blower fan calculates.
Described method of carrying out the Current Vector Control of stator voltage vector oriented in I, II current controller comprises the steps:
(1) generator unit stator line voltage u
AbBy the low pass filter of a series connection and the phase place of phase-locked loop and process angular transformation acquisition phase voltage, be used for the three-phase current of Vienna rectifier is carried out conversion of two-phase static coordinate and rotating coordinate transformation, obtain d shaft current i
dWith q shaft current i
q, i wherein
dRepresent the real component of electric current, and i
qThen represent the idle component of electric current;
(2) Shu Ru i
a, i
bBy the static coordinate conversion of three-phase, obtain the current component i of static two-phase reference axis alpha-beta axle to two-phase
αAnd i
β, conversion obtains the phase theta of current electric current through antitrigonometric function
i, this phase place is forced as the phase place of controlling voltage vector, and is input to the space vector modulation device;
(3) with active current desired value i
d *With reactive current desired value i
q *With the current d shaft current i that surveys
dWith q shaft current i
qDeviation passing ratio integral controller controlled voltage u respectively
dAnd u
q, and then pass through following formula:
Calculate the modulation degree m of control voltage vector, input space vector modulator.
Compared with prior art, the present invention has the following advantages:
1, generator 6 phase winding structures can provide a plurality of insulating power supplies, have not only shared the capacity of whole system, also help simplifying the parallel connection combination of rectifier.Wherein the winding of Ge Liing makes parallel connection not have circulation problem, and anti-phase characteristic then can be eliminated the mains ripple of the dc-link capacitance of three level rectifiers automatically.
2, the leakage inductance of the every phase winding of generator can provide the Boost inductance that needs as the Vienna rectifier, and therefore whole Vienna rectifier in parallel does not use the inductance of any outside, greatly reduces loss, cost expense and the volume of passive component.
3, Bing Lian two Vienna rectifiers by d-q-0 axial vector control realize magneto alternator speed change (
Control mode), the present invention proposes a kind of vector control method based on stator voltage vector oriented, does not need the position signalling of reaction generator rotor, adopts the method for voltage vector follow current vector to guarantee to realize magneto alternator simultaneously
The speed Control scheme.The sharing control of rectifier realizes by current closed-loop, and therefore its dc-link capacitance mid-point voltage can eliminate the three secondary frequencies pulsation of capacitance voltage automatically because phase current is anti-phase.
4, the present invention has the rectifier Redundancy Design, and promptly any one group of current transformer breaks down, then excise the fault rectifier after, whole system can under the situation that power reduces by half, continue the operation.
5, for high-power 690V low-pressure air electric system, the scheme that the present invention proposes is compared with the scheme of traditional two level parallel connections has approaching cost, but the loss of rectifier can reduce by 50%, can improve the efficient of system greatly.
Description of drawings
Fig. 1 is the overall structure figure of generator system of the present invention.
Among the figure: 1.-blower fan; 2.-6 phase magneto alternator; 3.-Vienna rectifier unit in parallel; 4.-combining inverter; 5.-connect the step-up transformer of electrical network.
Fig. 2 is the stator winding structure and the electromotive force vectogram of 6 phase magneto alternators among Fig. 1.Wherein Fig. 2 a is the stator winding distribution map; Fig. 2 b is the electromotive force vectogram of generator.
Fig. 3 is the structured flowchart of the Vienna rectifier unit among Fig. 1.
Fig. 4 is the schematic diagram that dsp controller is controlled rotation speed of fan among Fig. 3.
Fig. 5 is the current controller schematic diagram among Fig. 4.
Fig. 6 is Vienna rectifier work wave emulation (PSCAD) figure.(switching frequency 1800Hz, generator leakage inductance 1.0mH, DC bus-bar voltage 1500V).
Fig. 7 is that (rated power 2.5MW) compared in the loss distribution of different rectifiers.
Fig. 8 is the relation of different rectifier losses and input power/switching frequency.Wherein Fig. 8 a is the relation of loss and input power; Fig. 8 b is the relation of loss and switching frequency.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Generator system
Fig. 1 has provided a kind of generator system overall structure that is used for wind power generation, and it is made of 5 major parts, comprises a magneto alternator 2., and 1. the input of the power of this magneto alternator connects blower fan, realizes the conversion of mechanical energy to electric energy; 3. electric energy output connect a Vienna rectifier unit, and to realize the conversion of mechanical energy to electric energy, the Vienna rectifier unit is realized electric energy AC-DC conversion, realizes the variable-speed operation control of blower fan simultaneously, and 4. its output link to each other with a combining inverter; 5. 4. this combining inverter will feed electric energy into electrical network by step-up transformer, realize the DC-AC conversion of electric energy, keep the stable of the middle DC bus-bar voltage of rectifier and inverter simultaneously; Step-up transformer effect 5. is to realize the parallel connection of the generator-converter system (being generally the 690V grade) of low pressure to high-voltage fence (being generally 10kV, 22kV or 35kV).
The inventive point of technical solution of the present invention concentrate on magneto alternator 2. with 3. two parts of Vienna rectifier unit in parallel, a kind of structure of 6 phase magneto alternators and the conversion that realizes blower fan speed Control and electric energy AC-DC by parallel connected in reverse phase Vienna rectifier have promptly been proposed.Have following technical characterstic:
(1) different with traditional threephase generator, the stator of the magneto alternator that the present invention proposes is designed to 6 phases, and electrical degree differs 180 °, promptly anti-phase each other (being labeled as 0 ° and 180 ° in Fig. 1 respectively) between two 3 phases;
(2) the mutual three anti-phase phase windings of two of generator covers are directly connected to two three level Vienna rectifiers (Fig. 2), these two Vienna rectifiers are connected in parallel on together in DC side, the power that not only can share generator can be eliminated the voltage fluctuation of three secondary frequencies of dc-link capacitance mid point simultaneously;
(3) directly produce two groups and isolate three phase mains, simplified the parallel connection of rectifier, overcome the generation of circulation by the design of magneto alternator polyphase windings;
(4) the Boost inductance of Vienna rectifier is directly provided by the leakage inductance of generator windings, and this can reduce the cost and the volume of passive component greatly, improves the efficient of system.
The generator Structure design
Fig. 2 a has provided the winding construction schematic diagram of 6 phase magneto alternators of the present invention's proposition.On general structure, electric machine structure still is traditional salient pole radial permanent magnet synchronous machine, and still different is that stator winding is designed to independently three phase windings of two covers, and two cover windings wherein all have been installed in each stator slot.The structure that Fig. 2 a has only drawn a pair of utmost point.A-x, B-y, C-z and D-u, E-m, F-n are respectively electrical degree and differ 180 ° three phase windings among the figure.In brief, the stator winding of 6 phase direct-drive permanent-magnetism synchronous generators of this paper proposition is to be made of two three phase windings that overlap 180 ° of electrical degrees of mutual deviations.In order to provide two to overlap independently three phase mains, and eliminate triple-frequency harmonics, the neutral points of two covers, three phase windings do not link to each other.Fig. 2 b has provided the electromotive force vectogram of winding.
According to the winding construction of Fig. 2, it is 2.5MW that the present invention has designed a power grade, and electric pressure is the model machine of 690V.The motor permanent magnet material adopts neodymium iron boron (B
R20=1.3T, H
C20=987kA/m), its main structure parameters is as follows: motor number of pole-pairs p=30, total groove is counted Q=288, every extremely every phase groove number
The unit motor is counted t=6, unit number of slots Z
0=48, unit motor number of pole-pairs p
0=5, winding period: 2-1-2-1-2.The equivalent circuit parameter such as the table 1 of generator.As seen, stator leakage reactance is enough to be used in serving as the Boost reactance of Vienna rectifier.
The single-phase parameter of table 12.5MW 6 phase direct-drive permanent-magnetism synchronous generators
The structure of parallel connected in reverse phase Vienna rectifier unit
Fig. 3 has provided the schematic diagram of device of the parallel connected in reverse phase rectifier of the present invention's proposition.Among the figure, the DC side parallel of two Vienna rectifiers (I and II) is in the same place, and its central point O also is connected to public dc-link capacitance mid point.The AC side (A, B and C) of Vienna rectifier (I and II) links to each other with two groups of magneto alternator anti-phase mutually stator winding (I and II) respectively.(I and II) Boost inductance of Vienna rectifier is served as by the leakage inductance of generator unit stator winding, and the power circuit of parallel rectifier device only constitutes (schematic diagram of Vienna rectifier switch circuit is seen shown in the frame of broken lines at Fig. 3 top) by switching circuit and the dc-link capacitance that power semiconductor constitutes like this.The phase current i of Vienna rectifier I AC side
aAnd i
b(Vienna rectifier II AC side corresponding current i
a' and i
b') measured by current transformer CT; Line voltage u
Abu
Ab' measured by voltage transformer pt, all feed back to dsp controller, be used to realize Current Vector Control; DC bus-bar voltage V
DCAnd V
DC1Also be fed back to dsp controller, be used to keep the balance of DC bus-bar voltage; The rotating speed measured value n of generator and the rotational speed setup n that from the power characteristic of current wind speed and blower fan, calculates
*Also import dsp controller, be used to realize the speed Control of generator, relevant control principle is set forth in the method in the back.The Vienna rectifier can be realized the power factor correction effect, guarantee that the generator unit stator electric current is sinusoidal wave, eliminate current harmonics and torque pulsation that causes thus and the problem that the motor feels hot that simple diode rectifier causes, the long-term reliability and the life-span of improving low-speed generator.Using Vienna rectifier major advantage is to reduce the quantity of IGBT (insulated gate bipolar transistor) on the basis of realizing three level functions to greatest extent.
The method of generator speed Control
In the technical scheme that the present invention proposes, the main effect of Vienna rectifier in parallel is: on the one hand the generator alternating current electric energy is converted to direct current energy, realizes the AC-DC function; Be as the generator side converter on the other hand, realize the variable-speed operation of generator.So-called variable-speed operation promptly according to the power characteristic of change of wind velocity and blower fan, is dynamically controlled the rotating speed of blower fan, realizes the output of blower fan maximum power.The method that Vienna rectifier in parallel is realized the blower fan speed Control as shown in Figure 4, this control method realizes by software in the dsp controller (see figure 3) of device.
As shown in Figure 4, rotational speed setup n
*Power characteristic by current wind speed and blower fan calculates, promptly under current wind speed, and n
*It is the rotating speed desired value that can make the blower fan Maximum Power Output.N is the actual speed of current blower fan.Obtain the desired value (i among the figure of active current behind deviation feedback process PI (proportional integral) adjuster of rotating speed
d *And i '
d *), and the desired value of reactive current (i among the figure
q *And i '
q *) then being set to 0, these electric current desired values are respectively applied to and realize magneto alternator in two identical current controllers (I and II among the figure)
Control mode (i.e. control by active power of output realizes the control to the magneto alternator rotating speed) is because the current controller of two Vienna rectifiers in parallel is identical, so can realize current-sharing under same electric current specified criteria.Current controller adopt that the present invention proposes based on the voltage oriented vector control scheme of generator unit stator, its principle is as shown in Figure 5.The modulation degree (m among the figure and m ') of the control voltage vector of current controller output and the phase place (θ among the figure of voltage vector
iAnd θ '
i), convert PWM (pulse-width modulation) control signal Gate1 and Gate2 to by the space vector modulation device (SVM among the figure) of Vienna rectifier, control the work of Vienna switching circuit by Drive Protecting Circuit.The concrete visible list of references [R.Burgos of the SVM modulator approach of Vienna rectifier, R.Lai, Y.Pei, F.Wang, D.Boroyevich, and J.Pou, Space Vector Modulation forVienna-Type Rectifiers Based on the Equivalence between Two-and Three-LevelConverters:A Carrier-Based Implementation, Power Electronics SpecialistsConference, 2007.PESC 2007.IEEE, page:2861-2867].For the SVM modulator, the duty ratio of its redundant vector can be used for keeping the balance (notion of relevant redundant vector also can referring to above-mentioned document) of electric capacity mid-point voltage.Because there is not the pulsating voltage of three times of fundamental frequencies in Vienna its electric capacity midpoint potential under the identical condition of phase current of parallel connected in reverse phase, but because the undesirable characteristic of transition wind energy and rectifier still can cause the electric capacity mid-point voltage to produce slowly drift, therefore must by one independently electric capacity neutral point voltage balance control closed loop stop the drift of voltage.This control closed loop cardinal principle is dynamically to adjust the right duty ratio (this redundancy vector produces rightabout variation to making midpoint potential) of redundant vector in the SVM modulator according to the drift bearing of electric capacity mid point.
In the control principle of Fig. 4, DC bus-bar voltage V
DcWith electric capacity mid-point voltage V '
DcBe fed back to dsp controller and carry out a deviation FEEDBACK CONTROL, and adopt simple proportional adjuster (proportional component g among the figure), an adjuster output normalized factor alpha (1≤α≤1), this coefficient is used to revise the duty ratio of the redundant vector of SVM modulator.The redundant vector of the SVM of for example current control voltage vector correspondence is V1 and V2, and the duty ratio that obtains according to desirable SVM algorithm computation is (the supposing that duty ratio equals d) that equates, it is as follows then to revise algorithm: the duty ratio d of redundant vector V 1
1=α d; The duty ratio d of redundant vector V 2
2=(1-α) d.
The current controller that Fig. 5 provides is one of important inventive point of proposing of the present invention.Different with the controlling schemes of traditional Vienna rectifier, the rotatable coordinate axis of the Vienna rectifier transform vector that the present invention proposes is chosen as the magneto alternator stator voltage vector oriented.Generator unit stator line voltage u
AbDetected by a low pass filter (Low-pass) back, (PLL) obtains its phase place by phase-locked loop, and this phase place deducts the phase theta that 30 degree obtain phase voltage
0, this phase place is used for the three-phase current of Vienna rectifier is carried out two-phase static coordinate conversion (3s-2s) and rotating coordinate transformation (2s-2r), obtains d shaft current i
dWith q shaft current i
q, i wherein
dRepresent the real component of electric current, and i
qThen represent the idle component of electric current.Because the switching circuit of Vienna rectifier directly is connected with the stator of generator in the technical scheme of the present invention, its Boost inductance is served as by the generator unit stator leakage inductance, so the outlet voltage of generator also is the output voltage of Vienna rectifier.In a switch vector sector of SVM modulator, the output voltage of Vienna rectifier is oneself to produce (promptly can not rotate automatically) that phase place increases, therefore, the present invention proposes to drive the rotation of voltage vector by current phasor by current phasor is overlapped with voltage vector.This control can well keep the same-phase relation of voltage and current, also effectively avoided the problem that the Vienna rectifier can not synthesized voltage vector in given current switch vector sector.According to this thought, in the control principle figure of Fig. 5, by the current component i of static two-phase reference axis alpha-beta axle
αAnd i
βCan obtain the phase theta of current electric current
i, this phase place is forced as the phase place of controlling voltage vector, and input SVM modulator; Active current desired value i
d *With reactive current desired value i
q *With the current d shaft current i that surveys
dWith q shaft current i
qDeviation by pi regulator controlled voltage u respectively
dAnd u
q, pass through following formula:
Calculate modulation degree m, input SVM modulator.As seen, this control method, because voltage vector and current phasor always overlap, it is the same sector that they always are in the SVM polar plot, so causing the rising (or decline) of dc-link capacitance voltage midpoint, in the whole primitive period, all fixes redundant vector, do not need to carry out the judgement of dynamic polarity, this also is the reason that a proportionality coefficient g is only adopted in balance of voltage control among Fig. 4.
The simulating, verifying of system
Fig. 6 has provided the simulation result of the Vienna rectifier output waveform that adopts above scheme realization.After the diagram waveform represented that the Vienna rectifier is started working, dynamo current d axle component step was given regularly, and phase current rises to the transient process of another stable state from a stable state.As seen, after Vienna started working, phase current waveform was very sinusoidal, and the dc bus mid-point voltage keeps good balance, did not also have the pulsation of treble frequency.
The comparison of the loss characteristic of system and traditional two level scheme in parallel
To the three level hybrid plans that the present invention proposes be compared under the grade of 2.5MW with two level (2L) scheme in parallel of routine.It is analytic target that Vienna and 2L rectifier are all selected the FRD of commercial IGBT module FZ1200R17KE3 and ad eundem.Can set up the loss model of different converter topology in conjunction with the damage curve of practical devices by the perfect switch circuit model.Select 125 ℃ IGBT and FRD loss characteristic curve, the loss of different converter topology distributes as shown in Figure 7.
As seen from Figure 7, main loss is produced by diode in the rectifier.Four clamp diode Dn1～Dn4 (as Fig. 2) of Vienna rectifier do not have reverse recovery loss, but its on-state loss occupies very high ratio in the total losses of whole current transformer, therefore Dn1～Dn4 should select the rectifier diode of low on-state pressure drop in practice, and should not select fast recovery diode.By contrast, the loss of Vienna rectifier is well below the 2L rectifier.
Fig. 8 has compared under the different input power and switching frequency, the loss change curve of 2L and Vienna rectifier.As seen, Vienna rectifier in parallel has higher efficient than two level rectifiers in parallel under the same capacity, and loss almost can reduce by 50%.Along with the raising of power, this effect is also more obvious.In addition, the loss characteristic of 2L rectifier and the relation of switching frequency are bigger, and promptly along with the raising of switching frequency, it is faster that the loss of 2L rectifier increases.This explanation 2L rectifier can not be operated under the higher switching frequency.Since the raising switching frequency can effectively reduce the interior harmonic current of generator, so the Vienna rectifier has the incomparable advantage of 2L rectifier.
Claims (5)
1, a kind of generator system that is used for wind power generation, comprise a magneto alternator, the power input of this magneto alternator connects blower fan, electric energy output connects a Vienna rectifier unit, to realize the conversion of mechanical energy to electric energy, the Vienna rectifier unit is realized electric energy AC-DC conversion, realizes the variable-speed operation control of blower fan simultaneously, and its output links to each other with a combining inverter; This combining inverter will feed electric energy into electrical network by step-up transformer, it is characterized in that, the stator of described magneto alternator adopts 6 designs mutually, be that stator winding is to be made of two I three phase windings and II three phase windings that overlap 180 ° of electrical degrees of mutual deviations, the neutral points of two covers, three phase windings do not link to each other; Described Vienna rectifier unit comprises two I Vienna rectifier and II Vienna rectifiers that structure is identical, these two three level Vienna rectifiers are at DC side parallel, its central point O is connected to public dc-link capacitance mid point, and I Vienna rectifier AC side connects generator I three phase windings; II Vienna rectifier AC side connects II three phase windings of generator; The Boost inductance of Vienna rectifier is directly provided by the leakage inductance of generator windings; Described Vienna rectifier unit also comprises a dsp controller, the output signal of this dsp controller links to each other with the input control end of II Vienna rectifier with I, the balance that the phase current by each Vienna rectifier AC side collection and the busbar voltage of line voltage and DC side collection are controlled the current phasor of two Vienna rectifiers and kept DC bus-bar voltage; And the rotation speed of fan measured value by gathering the generator power intake and the current wind speed speed Control that realizes generator.
2, the generator system that is used for wind power generation as claimed in claim 1 is characterized in that, described dsp controller output links to each other with the input control end of II Vienna rectifier with I by a Drive Protecting Circuit respectively.
3, a kind of generator system based on claim 1 wind power generation is realized the method for generator speed Control, it is characterized in that, comprises the steps:
(1) with the rotary speed setting value n of blower fan
*Ask poor with current tachometer value n, obtain the desired value i of active current behind the pi regulator in this deviate process dsp controller
d *And i '
d *, and the desired value i of reactive current
q *And i '
q *Then all be set to 0, described electric current desired value i
d *And i '
d *, i
q *And i '
q *Be respectively applied in two identical I current controllers of DSP and the II current controller, simultaneously with I Vienna rectifier AC side phase current i
a, i
bWith line voltage u
Ab, II Vienna rectifier AC side phase current i
a', i
b' and line voltage u
Ab' be input to I current controller and II current controller respectively;
(2) I, II current controller carry out the Current Vector Control of stator voltage vector oriented, the modulation degree m of the control voltage vector of output and the phase theta of m ' and voltage vector
iAnd θ '
i, convert pwm control signal Gate1 and Gate2 to by I space vector modulation device and II space vector modulation device respectively, control the work of the switching circuit in I, the II Vienna rectifier respectively; Realize the speed Control of magneto alternator;
(3) with DC bus-bar voltage V
DC1/2 and electric capacity mid-point voltage V
DC1Ask poor, this deviate is delivered to the duty ratio that I space vector modulation device is used to revise the redundant vector of modulator through normalized factor alpha of the output of the proportional controller g in the dsp controller, realizes the balance of dc bus capacitor mid-point voltage; The value of normalization coefficient α is-1≤α≤1.
4, realize the method for generator speed Control it is characterized in that described rotary speed setting value n based on the generator system of claim 1 wind power generation as a kind of as described in the claim 3
*Power characteristic by current wind speed and blower fan calculates.
5, as a kind of method that realizes the generator speed Control based on the generator system of claim 1 wind power generation as described in the claim 3, it is characterized in that described method of carrying out the Current Vector Control of stator voltage vector oriented in I, II current controller comprises the steps:
(1) generator unit stator line voltage u
AbBy the low pass filter of a series connection and the phase place of phase-locked loop and process angular transformation acquisition phase voltage, be used for the three-phase current of Vienna rectifier is carried out conversion of two-phase static coordinate and rotating coordinate transformation, obtain d shaft current i
dWith q shaft current i
q, i wherein
dRepresent the real component of electric current, and i
qThen represent the idle component of electric current;
(2) Shu Ru i
a, i
bBy the static coordinate conversion of three-phase, obtain the current component i of static two-phase reference axis alpha-beta axle to two-phase
αAnd i
β, conversion obtains the phase theta of current electric current through antitrigonometric function
i, this phase place is forced as the phase place of controlling voltage vector, and is input to the space vector modulation device;
(3) with active current desired value i
d *With reactive current desired value i
q *With the current d shaft current i that surveys
dWith q shaft current i
qDeviation passing ratio integral controller controlled voltage u respectively
dAnd u
q, and then pass through following formula:
Calculate the modulation degree m of control voltage vector, input space vector modulator.
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| CN2009100238199A CN101640423B (en) | 2009-09-08 | 2009-09-08 | Generator system for wind power generation and variable speed control method |
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| CN2009100238199A CN101640423B (en) | 2009-09-08 | 2009-09-08 | Generator system for wind power generation and variable speed control method |
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