CN1881767A - Control structure of full power type AC-DC-AC converter for wind power generation - Google Patents

Control structure of full power type AC-DC-AC converter for wind power generation Download PDF

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CN1881767A
CN1881767A CNA2006100388084A CN200610038808A CN1881767A CN 1881767 A CN1881767 A CN 1881767A CN A2006100388084 A CNA2006100388084 A CN A2006100388084A CN 200610038808 A CN200610038808 A CN 200610038808A CN 1881767 A CN1881767 A CN 1881767A
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signal
voltage
torque
current
control
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CN100486093C (en
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曹仁贤
李维华
杨淑英
余勇
张兴
汪东林
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Sungrow Power Supply Co Ltd
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HEFEI SUNLIGHT POWER SUPPLY CO Ltd
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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 relates to a controller of full-power alternative-direct converter used in wind generation, wherein the alternative-direct converter is formed by network converter and the convert of generator; the used generator is a permanent-magnetic generator; the rotor is in permanent-magnetic structure, without external magnetic activate power supply; two convert loops both uses the PWM converters operating in four quadrants, based on full-control element, which can improve the dynamic response, reduce cost and impact, realize bidirectional transmission of electricity, and realize generating via power factor sine wave current parallel network; and the invention uses improved direct torque technique to control the converter, to confirm the sine wave change of input current at the stator, with quick response, low vibration, torque dynamic control and wide speed adjust range.

Description

The control structure of full power type AC-DC-AC converter for wind power generation
Technical field
The present invention relates to a kind of control structure of used for wind power generation direct-driving type AC-DC-AC converter.
Background technology
Wind power generation with its cleaning, pollution-free, take up an area of less, advantage such as the construction period is short, management is single, maintenance workload is little, operation cost is low, now become one of important content of domestic and international development new and renewable sources of energy, become the field of giving priority to of energy industry.Typical technology scheme in the at present advanced wind-driven generator product is nothing more than two kinds of speed change dual-feed asynchronous wind power generator and non-gear box variable speed permanent magnetism synchro wind generators.The frequency converter of speed change dual-feed asynchronous wind power generator, power are about 1/4th of the power of the assembling unit, and the total price of unit is lower, but have gear box, and its maintaining expense is far above non-gear box variable speed permanent magnetism synchro wind generator.Permanent-magnetic wind driven generator is a kind of synchronous generator, belongs to same type with generator in the big electrical network, and different is, it saves electric brush slip ring with the excitation of the alternative common generator of permanent magnet, and is simple and reliable for structure, simultaneously also save exciting power, improved generator efficiency.Along with wind-powered electricity generation machine change in rotational speed, the frequency of permanent-magnetic wind driven generator institute electricity also is constantly to change, thus also must be with a flat-out frequency converter, these electric energy are changed into the alternating current of constant frequency and constant voltage, could import electrical network.
The generator that four-quadrant AC-DC-AC converter system is adopted is a magneto-electric generator, and rotor is the magneto structure, need not the outside field power supply is provided, and has improved efficient.Its variable speed constant frequency control also realizes at stator circuit, the alternating current of the frequency conversion of permanent magnet generator is changed into electrical network with alternating current frequently by handing over the orthogonal grid-connected converter, so the capacity of current transformer is identical with the rated capacity of system.
AC-DC-AC converter is made up of net side converter and generator side converter.These two current transformers adopt diode rectifier and thyristor active inverter respectively in the prior art, have that current harmonics is bigger, dynamic response is slow, loss is big and can not realize shortcomings such as four quadrant running.
Summary of the invention
The control structure that the purpose of this invention is to provide a kind of full power type AC-DC-AC converter for wind power generation.
Technical scheme of the present invention is as follows:
The control structure of full power type AC-DC-AC converter for wind power generation is characterized in that the frequency converter topological structure that the main circuit of motor side current transformer adopts uncontrollable rectifier bridge and PWM DC/AC bridge-type inverter to be in series.Fig. 1 is the hardware structure diagram of system, wherein the three-phase ac signal of grid side input is through the rectifier bridge rectification, the direct current signal of output is through the intermediate link of frequency converter, the idle component that inductance L 1 wherein and reactance C1 are mainly used in filtering and storage circuit, make the voltage signal of rectifier bridge output more level and smooth, be beneficial to realize the PWM Current Control; Be converted to frequency and all adjustable three-phase alternating voltage signal of amplitude behind the d. c. voltage signal process PWM DC/AC bridge-type inverter, give the alternating current machine power supply of load-side.Use high performance Hall current and voltage sensor that electric current and voltage signal are sampled in the control system.The Hall effect voltage sensor measures DC bus-bar voltage signal UD, guides to the A/D pin of DSP after the A/D conversion; The current signal that ID obtains is changed through A/D, gives overvoltage and overcurrent protection that frequency converter is realized in the software protection unit; Detect the output speed signal ω of permagnetic synchronous motor by pulse coder rWith ω rWith simulation rotational speed setup signal ω r *Put into speed regulator (PID adjuster) after comparing and calculate torque set-point T e *Voltage sample value UABC and current sampling data IABC insert the A/D pin of DSP through the A/D change-over circuit, obtain voltage and current signal U under two phase coordinate systems by coordinate transform formula (3/2 conversion) α βAnd I α βAccording to the torque calculation formula T e = 3 2 p n ( ψ sα i sβ - ψ sβ i s ∂ ) , Can calculate the actual output torque value T of motor e, p wherein nIt is the number of pole-pairs of motor; Motor torque set-point and actual value are compared back input torque hysteresis comparator calculate torque adjustment signal T QWhen the given signal of torque is undergone mutation, in order to play the purpose that reduces torque fast, in the torque hysteresis comparator, add the hysteresis comparator of a bound broad, obtain stator magnetic linkage opposing torque signal P/N; Computing formula ψ according to magnetic linkage S α=∫ (u S α-R si S α) dt and ψ S β=∫ (u S β-R si S β) dt (R wherein sBe the motor stator side resistance), can calculate the actual value ψ of motor stator magnetic flux amplitude sThe amplitude ψ that keeps stator magnetic flux s *Be steady state value, magnetic flux set-point and actual value are compared the conditioning signal ψ that back input stator magnetic flux hysteresis comparator can obtain the stator magnetic flux amplitude QIn addition, because the stator magnetic linkage vector spatially is the circular trace of constant amplitude, distributing according to magnetic linkage position judgment formula and prior ready-portioned sector to obtain the locus signal θ of magnetic linkage; If the switch shape of inverter is defined, be defined as state " 1 " when establishing on the inverter brachium pontis pipe conducting, be defined as state " 0 " during following pipe conducting, then the switch on the three-phase brachium pontis has 8 kinds of combinations of states; Wherein six nonzero voltage space vector V1-V6 and two no-voltage vector V 0, V7; These six nonzero voltage space vectors are the hexagon track and distribute in the space, wherein the effect of no-voltage is to make the rotary speed that reduces stator magnetic flux; The voltage vector of different sectors is different with the regulating action of magnetic linkage amplitude to torque, has constructed the voltage vector switch form of regulating torque and magnetic linkage amplitude under different sectors thus, according to torque adjustment signal T Q, magnetic flux conditioning signal ψ QWith the locus signal θ of magnetic linkage, the voltage vector that selection is best increases motor torque and magnetic linkage on request or reduces, and reaches the effect of regulating rotating speed;
When double-fed generator was operated in the metasynchronism state, the net side converter absorbed energy from electrical network, is operated in rectification state; When double-fed generator was operated in supersynchronous state, energy was from the DC side feedback to the electrical network, and the net side converter is operated in inverter mode; The bus direct voltage is constant and have a good dynamic response ability, control of net side unity power factor and input current are the controlled target of net side converter for sine wave, what the net side converter adopted is the Direct Current Control of PWM fixed switching frequency, the main circuit power model adopts the IPM module, three-phase alternating current reactance device La, Lb, Lc is mainly used in the idle component of filtering and storage circuit, to realize the PWM Current Control, the dc bus capacitor both end voltage becomes the A/D pin that digital signal inserts DSP through the A/D change-over circuit, compare with the outer voltage command signal as the feedback signal of dc voltage and to send into the outer voltage pi regulator, its output is multiplied each other with net top-cross stream voltage synchronizing signal again, generate the command signal of current inner loop adjuster, net side three-phase alternating current i a, i bBecome the A/D pin that digital signal inserts DSP through the A/D change-over circuit, compare with the command signal of current inner loop adjuster, pass through current inner loop ratio amplification coefficient K again as the feedback signal of three-phase alternating current Ip, suitable feed-forward coefficients K is chosen in its output and electrical network electromotive force feedforward addition F, its result exports 6 road pulse width signals by the PWM modulation generating unit of DSP and inputs to the isolated drive circuit of being made up of optocoupler, directly controls the power tube in the IPM module; Realization is to the control of net side converter.
Principle of the present invention is described as follows:
Contravarianter voltage output
In direct torque control, space vector of voltage is a very important physical quantity.Six operating voltage states of inverter provide the motion space vector of voltage of six different directions, and their periodic orders occur, and differ 60 between adjacent two vectors, and the space vector of voltage amplitude is constant.Two zero on off states provide two no-voltage space vectors, and they are positioned at hexagonal center.The space voltage vector of suitable selection motor can make the movement locus of magnetic linkage be approximately circular.The selection principle of space vector of voltage is that this vector can make stator magnetic linkage change big as far as possible angle in a control cycle, i.e. torque changes maximum.
Torque control
Direct Torque Control also is a kind of torque closed-loop control system.The main distinction of it and torque closed-loop vector control system is without the PI torque controller but adopts two point form Bang-Bang control to realize the quick response of torque, need not be rotor field-oriented and calculate electromagnetic torque with stator magnetic linkage, deviation according to torque and stator magnetic linkage actual value and set-point is directly determined PWM inverter switching device signal, and the direct torque control method can not be subjected to the influence of rotor parameter like this.Too small when motor torque, promptly actual motor torque and given torque error are prescribed a time limit above the following of torque controller, and inverter is exported the rotary speed that corresponding nonzero voltage space vector is accelerated stator magnetic linkage according to the residing sector position of magnetic linkage, and the control electromagnetic torque increases; In like manner, when motor torque was excessive, the input of the error of torque controller exceeded the upper limit, and inverter is exported the rotating speed that corresponding no-voltage vector reduces stator magnetic linkage, reduces angle of torsion δ, plays the effect that suppresses torque.But no-voltage but is different at asynchronous machine with effect in the synchronous machine.For asynchronous machine, air-gap flux is set up jointly by stator and rotor, but determines by stator voltage is unique, when selecting the no-voltage vector, stator voltage is zero, and the magnetic linkage increment is zero, it is motionless that stator flux vector will remain on original position, and rotor current and electromagnetic torque descend fast.Therefore can select for use no-voltage vector moment when keeping the magnetic linkage amplitude constant to reduce torque.Though but in PMSM DTC system, select for use the no-voltage vector can make stator magnetic linkage keep original position motionless, zero vector interacts with the rotor magnetic pole permanent magnetic field that exists always, will produce torque, can not play the effect that effectively reduces torque fast.Therefore the validity that no-voltage is used in PMSM DTC system is limited to, and more here use reverse voltage vectors reduce torque, and this also is one of difference of PMSM DTC and IM DTC.In following table, τ, φ are respectively the output of torque and magnetic flux hysteresis comparator, and θ (1)-θ (6) represents the interval at magnetic pole of the stator place.
φ τ θ 1 θ 2 θ 3 θ 4 θ 5 θ 6
φ=1 τ=1 V 2(110) V 3(010) V 4(011) V 5(001) V 6(101) V 1(100)
τ=0 V 6(101) V 1(100) V 2(110) V 3(010) V 4(011) V 5(001)
φ=0 τ=1 V 3(010) V 4(011) V 5(001) V 6(101) V 1(100) V 2(110)
τ=0 V 5(001) V 6(101) V 1(100) V 2(110) V 3(010) V 4(011)
Magnetic linkage control
In high performance power transmission system, adopt speed closed loop control.In order effectively to control electromagnetic torque, must in controlling torque, also control magnetic flux or magnetic linkage.Magnetic linkage control and torque control are in the status of no less important.Usually below base speed, adopt permanent flux regulator and more than base speed, adopt weak magnetic control system, the different control system control magnetic fluxs or the method difference of magnetic linkage.Direct Current Governor System control air-gap flux; Vector control system adopts the method for control rotor flux, and direct Torque Control is then controlled stator magnetic linkage.Directly detect stator magnetic linkage and have the problem of many technologies and technology, thereby use less.In the real system, often adopt the method for indirect operation, promptly detect the physical quantity that stator voltage, stator current and the motor speed etc. of motor measure easily,, calculate the amplitude and the phase place of required magnetic linkage in real time then according to the Mathematical Modeling of motor.The stator magnetic linkage instantaneous value is obtained by the back-emf integral and calculating to motor, estimate by detecting three-phase voltage and electric current in the reality, calculate the motor instantaneous torque by electric current and magnetic linkage again, the magnetic linkage of gained and torque instantaneous value are chosen voltage vector with its set-point by the position that sluggishness combines the magnetic linkage place after relatively more respectively.
The weak magnetic control system of permagnetic synchronous motor direct torque control
Along with the development of rare earth permanent magnetic material, high performance permanent magnetic material is applied in the motor, makes the anti-degaussing ability of magneto strengthen.Therefore motor allows to flow through bigger d-axis demagnetizing current, for the high speed weak magnetic field operation of motor provides possibility.Simultaneously need this motor to do to weaken the magnetic field operation in order to improve the extensive use of magneto in wide speed regulating range and output-constant operation occasion.Present high performance permagnetic synchronous motor system adopts with rotor field-oriented vector control technology more, so to the observation of stator magnetic linkage difficulty relatively.And the permagnetic synchronous motor direct Torque Control can directly be controlled stator magnetic linkage, so its weak magnetic control system becomes and be easy to, and simpler than vector control.Because permanent-magnetic synchronous motor rotor magnetic field is constant, therefore can not directly reduce exciting current to obtain weak magnetic control system as direct current machine.The basic thought of the weak magnetic control system of permagnetic synchronous motor is to utilize motor d-axis armature reaction, and the air-gap field of motor is weakened, and reaches to be equivalent to the control effect that directly weakens strive forward magnetic magnetic field.Interior permagnetic synchronous motor (IPMSM) belongs to salient pole synchronous electric machine, this electromechanics intensity height, and magnetic air gap is little, and armature reaction is strong, is suitable for high-speed cruising, can do permanent torque control, is more suitable in weak magnetic field operation.Speedless sensor permagnetic synchronous motor direct Torque Control
Speed is to realize an important parameter of direct torque control, for improving the control performance of system, should adopt speed closed loop control, therefore needs to detect rotating speed of motor.Traditional motor speed checkout gear adopts tachogenerator or photoelectric encoder more, and the installation of these velocity transducers, maintenance, non-linear and low-speed performance, particularly the accuracy of Ce Lianging has directly influenced the effect of direct torque control.Sensorless technology is a great development direction that exchanges transmission at present, realizes that Speedless sensor can make cost reduction, the reliability height of system, and is applicable to the application scenario that some are special.Therefore, more and more scholars is placed on sight in the exploitation of Speedless sensor control system.In direct torque control, control system need determine that corresponding inverter drives signal according to the sector at stator magnetic linkage place, as long as site error is no more than 60 ° of controls that just can realize motor.Therefore, direct torque control itself is not strict to status requirement, is easy to realize Speedless sensor control.
Because direct torque control is the control of rotor-position open loop, be that the angle of torsion δ of or hysteresis rotor flux leading by dynamic adjustment stator magnetic linkage obtains required torque, with guarantee between the stator and rotor synchronously.Therefore in motor operation course, needn't detect rotor-position.Just when electric motor starting, the initial position that need learn rotor magnetic pole is to determine the initial magnetic linkage of stator and to carry out the estimation of stator magnetic linkage.As the control system of speed closed loop, the acquisition of speed is necessary.Therefore, as long as can estimate, just can realize DTC to speed
And Bringing following formula into can get
The no transducer control of PMSM significantly reduces system cost.Adopt a kind of computational methods of Speedless sensor of direct estimation rotating speed here.Ask the calculation process to be: in the steady state operation of synchronous motor, the rotating speed of stator and rotor is identical to be ω sr, putting before this, can under the stator rest frame, set up direct Torque Control velocity estimation model:
The method realizes simple and convenient, but it should be noted that such evaluation method high velocity performance is relatively good, has bigger error in low regime, and this is by its precondition decision.
The detection of initial position is the operating matter of utmost importance of electric motor starting.In permagnetic synchronous motor, adopt back-emf Integral Estimation stator magnetic linkage, owing to itself the stationary magnetic field is arranged on the permanent magnet machine rotor, initial magnetic linkage is non-vanishing, therefore direct torque control need at first be known the position of rotor magnetic pole, thereby determine to be added in initial voltage vector on the inverter, and adopt integrator estimation stator magnetic linkage also will know the position of initial magnetic linkage.In sensorless control system, owing to do not have transducer to know the position of current rotor, so control system at first will be carried out the location of rotor magnetic pole.Utilized a constant stator field that the rotor of permanent magnetism is fixed on certain position, promptly repeated multiple times is sent a fixing space voltage vector rotor is drawn on the known location that goes to expectation.Owing to be dynamically during electric motor starting, the variable quantity at motor torque angle wants big during far beyond the motor stable state, and purpose is fast rotor to be pulled to synchronous rotation to reach steady operation.Though so, be sufficient for sb.'s need with the resulting initial position precision of above method and not really high.When system realized, repeated multiple times was sent after vector generation (1,0,0) continues for some time, and sent the zero vector of certain hour again, and rotor magnetic pole just has been stabilized on the pairing pole orientation of A phase winding after the repeated several times.Actual this method of proof is feasible, therefore, adopts above method that motor is successfully started.
Advantage of the present invention:
The present invention adopts direct torque control (DTC) to come permagnetic synchronous motor is controlled.It has the advantage of a lot of aspects: 1. with stator flux orientation, only need the parameter of control motor stator side, the influence that the control effect is not changed by the rotor loop parameter; 2. controlling computing all carries out in the stator rest frame; 3. adopt the torque closed loop directly to control the magnetic linkage and the torque of motor, pursue the rapidity and the accuracy of torque control; 4. adopt two controls of closed loop (Band-Band control), by changing the tolerance of hysteresis regulator, the fluctuation of speed that two formula torque controls are caused is limited within the scope of allowing; 5. utilize the notion of space voltage vector, directly conducting and the off state to six switching devices of inverter carries out Comprehensive Control, and under identical control effect, the facies-controlled inverter switch device switch of score number of times is few, and switching loss is little.Direct torque control has been abandoned the thought of decoupling zero in the vector control, has overcome transform vector control calculation of complex to a great extent, and the control effect is subjected to shortcomings such as the rotor parameter variable effect is bigger, its system's control structure is simple, torque response is rapid, and robustness strengthens, and control performance is good.
The present invention all adopts PWM current transformer based on the four quadrant running of full-control type device to two unsteady flow links, not only can improve the dynamic response of system, reduce loss and impact, realize the transmitted in both directions of electric energy, and can also realize the operation of generating electricity by way of merging two or more grid systems of wind-driven generator net side unity power factor sine-wave current.Adopt the Direct Torque technology improved that inverter is controlled simultaneously, guaranteed that the sine wave of motor stator side input current changes, have that response is fast, little, a series of characteristics such as torque is dynamically controlled, speed-regulating range width of fluctuation.
Description of drawings
Fig. 1 is the annexation figure of total power type AC-DC-AC converter and wind-driven generator.
Fig. 2 is circuit theory diagrams of the present invention.
Fig. 3 is a magneto alternator direct torque control structure chart.
Fig. 4 is net side converter control control structure figure of the present invention.
Embodiment
Referring to accompanying drawing.
The control structure of generator side converter: the frequency converter topological structure that the main circuit of pusher side current transformer adopts uncontrollable rectifier bridge and PWMDC/AC bridge-type inverter to be in series; The idle component that is mainly used in filtering and storage circuit of inductance L 1 and reactance C1 makes input current of inverter more level and smooth, is beneficial to realize the PWM Current Control; ID, IA are high-precision Hall current sensor, and UA, UD are the high-precision hall voltage sensor, and they are respectively DSP precise current, voltage sampling signal are provided; Discharge and recharge the main circuit power model and adopt the IPM module, rectifier bridge side input ac voltage signal obtains comparatively level and smooth d. c. voltage signal after passing through inductance L 1 and capacitor C 1 flat ripple after the rectification; The Hall effect voltage sensor measures DC bus-bar voltage signal UD, guides to the A/D pin of DSP after the A/D conversion; The current signal that ID obtains is changed through A/D, gives overvoltage and overcurrent protection that frequency converter is realized in the software protection unit; Detect the output speed signal ω of permagnetic synchronous motor by pulse coder rWith ω rWith simulation rotational speed setup signal ω r *Put into speed regulator (PID adjuster) after comparing and calculate torque set-point T e *Voltage sample value UABC and current sampling data IABC insert the A/D pin of DSP through the A/D change-over circuit, obtain voltage and current signal U under two phase coordinate systems by coordinate transform formula (3/2 conversion) α βAnd I α βAccording to the torque calculation formula T e = 3 2 p n ( ψ sα i sβ - ψ sβ i s ∂ ) , Can calculate the actual output torque value T of motor e, p wherein nIt is the number of pole-pairs of motor; Motor torque set-point and actual value are compared back input torque hysteresis comparator calculate torque adjustment signal T QWhen the given signal of torque is undergone mutation, in order to play the purpose that reduces torque fast, in the torque hysteresis comparator, add the hysteresis comparator of a bound broad, obtain stator magnetic linkage opposing torque signal P/N; Computing formula ψ according to magnetic linkage S α=∫ (u S α-R si Sa) dt and ψ S β=∫ (u S β-R si S β) dt (R wherein sBe the motor stator side resistance), can calculate the actual value ψ of motor stator magnetic flux amplitude sThe amplitude ψ of stator magnetic flux s *Be steady state value, magnetic flux set-point and actual value are compared the conditioning signal ψ that back input stator magnetic flux hysteresis comparator can obtain the stator magnetic flux amplitude QIn addition, because the stator magnetic linkage vector spatially is the circular trace of constant amplitude, distributing according to magnetic linkage position judgment formula and prior ready-portioned sector to obtain the locus signal θ of magnetic linkage; If the switch shape of inverter is defined, be defined as state " 1 " when establishing on the inverter brachium pontis pipe conducting, be defined as state " 0 " during following pipe conducting, then the switch on the three-phase brachium pontis has 8 kinds of combinations of states; Wherein six nonzero voltage space vector V1-V6 and two no-voltage vector V 0, V7; These six nonzero voltage space vectors are the hexagon track and distribute in the space, wherein the effect of no-voltage is to make the rotary speed that reduces stator magnetic flux; The voltage vector of different sectors is different with the regulating action of magnetic linkage amplitude to torque, has constructed the voltage vector switch form of regulating torque and magnetic linkage amplitude under different sectors thus, according to torque adjustment signal T Q, magnetic flux conditioning signal ψ QWith the locus signal θ of magnetic linkage, the voltage vector that selection is best increases motor torque and magnetic linkage on request or reduces, and reaches the effect of regulating rotating speed;
The control structure of net side converter:
What the net side converter adopted is the Direct Current Control of PWM fixed switching frequency, have input current for sinusoidal wave, power factor is controlled, can be to advantages such as electrical network feedback electric energy.When double-fed generator was operated in the metasynchronism state, the net side converter absorbed energy from electrical network, is operated in rectification state; When double-fed generator was operated in supersynchronous state, energy was from the DC side feedback to the electrical network, and the net side converter is operated in inverter mode.DC bus-bar voltage is constant and have the good dynamic response ability, and control of net side unity power factor and input current are the controlled target of net side converter for sine wave.Its topology and control structure are as shown in Figure 3.
Net side converter software is divided into two parts, main program module and interrupt service routine module.In main program module, mainly finish the initialization of system, function comprises the initialization of special-purpose register in the initialization, DSP of initialization, the peripheral module control register of system register, the initialization of User Defined variable, interrupts open and waits for and enter interrupt service subroutine.
Interrupt service routine is the core of whole net side converter, and most of work is all finished in interrupt service routine.Because will generate and drive the required switching frequency of IGBT is the pwm signal of 10K hertz, the time that each response is interrupted must not surpass 100 μ s.Interrupt service routine adopts modularized design, and major function comprises AC and DC voltage detection module, alternating current detection module, mains frequency and phase detecting module, outer voltage adjuster computing module, current inner loop adjuster computing module, current-order computing module, electrical network electromotive force feedforward computing module, protection module etc.Specific algorithm is at first being sent to the comparison error signal of outer voltage command signal with the DC bus-bar voltage that is detected in the outer voltage adjuster, its output is multiplied each other with net top-cross stream voltage synchronizing signal again, generate the command signal of current inner loop adjuster, after the output of current inner loop adjuster and the electrical network electromotive force feedforward addition, its result is sent in the PWM comparator, as the control signal of IGBT switch driving circuit.Outer voltage guarantees that DC bus-bar voltage is constant, and current inner loop then guarantees the capability of fast response of system.

Claims (1)

1, the control structure of full power type AC-DC-AC converter for wind power generation, it is characterized in that the frequency converter topological structure that the main circuit of motor side current transformer adopts uncontrollable rectifier bridge and PWM DC/AC bridge-type inverter to be in series, wherein the three-phase ac signal of grid side input is through the rectifier bridge rectification, the direct current signal of output is through the intermediate link of frequency converter, the idle component that inductance L 1 wherein and reactance C1 are mainly used in filtering and storage circuit, make the voltage signal of rectifier bridge output more level and smooth, be beneficial to realize the PWM Current Control; Be converted to frequency and all adjustable three-phase alternating voltage signal of amplitude behind the d. c. voltage signal process PWMDC/AC bridge-type inverter, give the alternating current machine power supply of load-side; Use high performance Hall current and voltage sensor that electric current and voltage signal are sampled in the control system; The Hall effect voltage sensor measures DC bus-bar voltage signal UD, guides to the A/D pin of DSP after the A/D conversion; The current signal that ID obtains is changed through A/D, gives overvoltage and overcurrent protection that frequency converter is realized in the software protection unit; Detect the output speed signal ω of permagnetic synchronous motor by pulse coder rWith ω rWith simulation rotational speed setup signal ω r *Put into speed regulator after comparing and calculate torque set-point T e *Voltage sample value UABC and current sampling data IABC insert the A/D pin of DSP through the A/D change-over circuit, obtain voltage and current signal U under two phase coordinate systems by coordinate transform formula (3/2 conversion) α βAnd I α βAccording to the torque calculation formula T e = 3 2 p n ( ψ sα i sβ - ψ sβ i s ∂ ) , Can calculate the actual output torque value T of motor e, p wherein nIt is the number of pole-pairs of motor; Motor torque set-point and actual value are compared back input torque hysteresis comparator calculate torque adjustment signal T QWhen the given signal of torque is undergone mutation, in order to play the purpose that reduces torque fast, in the torque hysteresis comparator, add the hysteresis comparator of a bound broad, obtain stator magnetic linkage opposing torque signal P/N; Computing formula ψ according to magnetic linkage S α=∫ (u S α-R si S α) dt and ψ S β=∫ (u S β-R si S β) dt (R wherein sBe the motor stator side resistance), can calculate the actual value ψ of motor stator magnetic flux amplitude sThe amplitude ψ that keeps stator magnetic flux s *Be steady state value, magnetic flux set-point and actual value are compared the conditioning signal ψ that back input stator magnetic flux hysteresis comparator can obtain the stator magnetic flux amplitude QIn addition, because the stator magnetic linkage vector spatially is the circular trace of constant amplitude, distributing according to magnetic linkage position judgment formula and prior ready-portioned sector to obtain the locus signal θ of magnetic linkage; If the switch shape of inverter is defined, be defined as state " 1 " when establishing on the inverter brachium pontis pipe conducting, be defined as state " 0 " during following pipe conducting, then the switch on the three-phase brachium pontis has 8 kinds of combinations of states; Wherein six nonzero voltage space vector V1-V6 and two no-voltage vector V 0, V7; These six nonzero voltage space vectors are the hexagon track and distribute in the space, wherein the effect of no-voltage is to make the rotary speed that reduces stator magnetic flux; The voltage vector of different sectors is different with the regulating action of magnetic linkage amplitude to torque, has constructed the voltage vector switch form of regulating torque and magnetic linkage amplitude under different sectors thus, according to torque adjustment signal T Q, magnetic flux conditioning signal ψ QWith the locus signal θ of magnetic linkage, the voltage vector that selection is best increases motor torque and magnetic linkage on request or reduces, and reaches the effect of regulating rotating speed;
When double-fed generator was operated in the metasynchronism state, the net side converter absorbed energy from electrical network, is operated in rectification state; When double-fed generator was operated in supersynchronous state, energy was from the DC side feedback to the electrical network, and the net side converter is operated in inverter mode; The bus direct voltage is constant and have a good dynamic response ability, control of net side unity power factor and input current are the controlled target of net side converter for sine wave, what the net side converter adopted is the Direct Current Control of PWM fixed switching frequency, the main circuit power model adopts the IPM module, three-phase alternating current reactance device La, Lb, Lc is mainly used in the idle component of filtering and storage circuit, to realize the PWM Current Control, the dc bus capacitor both end voltage becomes the A/D pin that digital signal inserts DSP through the A/D change-over circuit, compare with the outer voltage command signal as the feedback signal of dc voltage and to send into the outer voltage pi regulator, its output is multiplied each other with net top-cross stream voltage synchronizing signal again, generate the command signal of current inner loop adjuster, net side three-phase alternating current i a, i bBecome the A/D pin that digital signal inserts DSP through the A/D change-over circuit, compare with the command signal of current inner loop adjuster, pass through current inner loop ratio amplification coefficient K again as the feedback signal of three-phase alternating current Ip, suitable feed-forward coefficients K is chosen in its output and electrical network electromotive force feedforward addition F, its result exports 6 road pulse width signals by the PWM modulation generating unit of DSP and inputs to the isolated drive circuit of being made up of optocoupler, directly controls the power tube in the IPM module; Realization is to the control of net side converter.
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