CN105958525A - PWM gird connected inverter control method of permanent magnetism wind generator system - Google Patents
PWM gird connected inverter control method of permanent magnetism wind generator system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The present invention discloses a PWM gird connected inverter control method of a permanent magnetism wind generator system. The method comprises: obtaining a current sample value and a filter capacitor current value in a grid connected current fundamental wave period T; subtracting the current feedback value from the current sample value; multiplying the value of subtracting the current feedback value from the current sample value after regulation by the synchronization signals, and obtaining the network side current instruction signals of the grid connected inverter; subtracting the filter capacitor current value from the filter capacitor current feedback value; performing proportion resonance regulation, and obtaining the filter capacitor current instruction signals; adding the network side current of the grid connected inverter and the current instruction signals after regulation with the filter capacitor current instruction signals together, then multiplying a proportion coefficient, and obtaining a total control amount; and generating the pulse-width modulation signal PWM of the inverter according to the total control amount. The active and inactive decoupling control are realized, and the stability and the high efficiency of the whole system are improved.
Description
Technical field
The present invention relates to power technology control field, particularly relate to the PWM of a kind of permanent magnetism wind power generation system
Control method of grid-connected inverter.
Background technology
The grid-connected system such as photovoltaic, wind-force is mainly made up of photovoltaic array, blower fan and combining inverter etc.,
In schedulable formula system, also can be equipped with accumulator as energy storage device.Grid-connected system is held by cooperation
The inverter that amount is suitable for is received on public electric wire net, by day in the case of abundance at sunshine, has gone out the load of offer this locality,
Unnecessary having put can be supplied to public electric wire net, night or overcast sky, and local load then directly obtains from electrical network
Required electric energy.
The inverter controlling technology in conjunction with PWM is referred to as PWM inverter, and PWM inverter was through more than 30 years
Exploration and research, make great progress, its main circuit develops into from half control type device bridge in early days
Wholly-controled device bridge of today；Its topological structure develops into how combined and the most electric from single-phase, three-phase circuit
Flat topological circuit；PWM on-off control is developed into Sofe Switch modulation, power etc. by simple hardware switch modulation
Level also develops into MW class from multikilowatt, along with the development of PWM inverter technology, has been devised by multiple
PWM inverter, specifically has a following several types:
Classify according to the electrical network number of phases: single-phase circuit, three-phase circuit, polyphase circuit；
Classifying according to PWM switch modulation: hard switching is modulated, Sofe Switch is modulated；
Classify according to bridge arrangement: half-bridge structure, full bridge structure；
Classify according to modulation level: two level, tri-level circuit, multi-level circuit；
According to the difference of DC energy storage element, PWM inverter is divided into again Voltage Source PWM Inverter and electric current
Type PWM inverter.Voltage-type, current source PWM inverter, either at main circuit structure, PWM
The aspects such as signal generation and control strategy all have respective feature, and there is the antithesis on circuit between the two
Property.Other location modes, for main circuit topological structure, all can range current mode or voltage type PWM is inverse
Become device.
Combining inverter is a critically important part of grid-connected system, its component voltage source type and current source type two
Kind.Voltage-source type PWM combining inverter Technical comparing is ripe, due to its good two-way parallel network reverse ability,
Thus in being widely used in and generating electricity by way of merging two or more grid systems.But the DC voltage of voltage controlled grid-connected inverter work is necessary
Constant higher than line voltage peak value and holding constant, so centre boost chopper to be added, can increase the most undoubtedly
Adding system cost, and reduce the efficiency of system.And three-phase current type PWM combining inverter is without booster circuit,
Directly utilize current type PWM combining inverter own characteristic and can solve the grid-connected problem that DC voltage is low,
Improve system effectiveness, save cost.
The control strategy of current source PWM inverter includes:
1) current indirect control
The basic ideas of current indirect control are by controlling the amplitude of inverter input voltage first-harmonic and phase place,
Indirectly control outputting inductance electric current so that AC output current phase keeps same phase with AC phase voltage,
Therefore amplitude phase controlling it is also called.
The advantage of current indirect control be control structure simple, without current sensor, and have good
Switching characteristic, static characteristic is good, it is simple to microcomputer realizes.And shortcoming is that dynamic response is slow, and system is joined
Number change is sensitive, there is direct current offset in dynamic process.
The current indirect control of current source PWM inverter, refers to by controlling inverter ac lateral capacitance voltage
Or the amplitude of ac output current and phase place, thus indirectly control the current on line side of current source PWM inverter.
The fundametal compoment of current source PWM inverter ac output current is the linear amplification of SPWM modulated signal,
Application SPWM technology, by the control of modulated signal just can be realized to inverter output current phase place with
The regulation of amplitude, then by AC LC filter filtering effect, it is possible to realize the Indirect Electro of inverter
Flow control, reaches to net side unity power factor.Certainly, for stable input direct-current electric current, indirect current control
System also needs to introduce current closed-loop feedback.
2) Direct Current Control
Direct Current Control is a kind of current transient tracking and controlling method, computing obtain ac-side current instruction
Signal, is re-introduced into ac-side current feedback, by the directly control of ac-side current is made its trace command electricity
Flow valuve.This control mode has the double-loop control structure of current inner loop and outer voltage；In current inner loop,
By the control of power-factor angle can be realized the control to reactive power.In outer voltage, to unidirectional current
The control of stream is then to be realized by the reference amplitude of regulation alternating current.Whether outer shroud voltage stabilization depends on
Can give by follow current rapidly and accurately in interior circular current.Owing to this control mode can be followed the tracks of negative effectively
Carrying the change of voltage, have dynamic property good, current limliting is easy, current control accuracy advantages of higher, by wide
General concern, and successively work out various different control program, mainly include by PID control, it was predicted that electric current
Control, Sliding mode variable structure control, POLE PLACEMENT USING, Quadratic Optimal Control, nonlinear feedback control,
The modes such as fuzzy control.But their common feature is to need to decouple control variable, computationally intensive, it is achieved
Difficulty, and the detection to state variable needs two current sensors, and the AC electromotive force that also needs to having passes
Sensor and capacitance voltage sensor, relatively costly.
The modulation system of current source PWM inverter
1) SPWM technology
SPWM technology is by sinewave modulation signal compared with the triangle carrier signal that frequency is fixed, intersection point
As switching point, obtaining a series of amplitude equal, the sequence of high frequency pulses that width does not waits, through inverter
After power amplification, it is possible to accurately reproduce modulating wave information, SPWM has excellent transmission characteristic, optimization
Spectrum distribution, become the basic mode of current modulation technique.
Current source inverter SPWM modulation technique is in two traditional logic bipolar SPWM modulation techniques
On the basis of, it being converted into three logic PWM waveform by certain matrix operations, this three logical signals are the most abundant
Embody the information of modulating wave, and be how all decoupling in the case of high and low frequency, can be used to control main
The opening and turning off of contactor, thus reach to control the purpose of ac-side current.
And along with the development of intelligent high-speed microcontroller chip, the shortening of instruction cycle, the enhancing of computing function
And the increase of memory capacity so that digitalized S PWM has had broader practice prospect.Therefore, in recent years
Carrying out voltage Vector Pulse Width Modulation technology to have obtained developing rapidly, the many aspects in Electrified Transmission have obtained extensively
General application.
1, Voltage space vector PWM method is to be applied in AC variable-frequency speed regulation system the earliest, uses
The AC variable-frequency speed regulation system of SVPWM pattern than using the Alternating Current Governor System of conventional SPWM pattern,
Not only motor torque ripple reduces, and feeds and improves to the DC voltage utilization rate of inverter；Stator simultaneously
Phase current is closer to sine wave, and harmonic wave is less, and uses the AC variable-frequency speed regulation system of SVPWM pattern
Its dynamic property is the most excellent.
2, current Voltage space vector PWM method is widely used in active filter, and it is 3-phase power converter
Control as an entirety, coordinated each alternate interaction of PWM main circuit well.This control
Strategy can trace command electric current effectively, it is suppressed that load harmonic, significantly reduces the electric current of mains side electric current
Resultant distortion rate, is a kind of effective current follow-up control scheme.
3, Voltage space vector PWM method is applied in rectification control system, and system has good dynamic
Can, it is easy to Digital Realization, High Power Factor can be realized, energy in bidirectional flow can be made again.It is the most prominent
Advantage to be linear modulationra improve about 15.47% than conventional SPWM control method, and, no
Same modulator approach will make switching loss obtain reduction in various degree.Being based on above-mentioned advantage, space is vowed
Amount PWM method is applied in rectification control system more and more widely.
Three-phase grid-connected inverter is typically by three phase full bridge circuit realiration, and each brachium pontis in three brachium pontis is by 2
Power device is connected, and intermediate connections is as three-phase voltage outfan, by controlling opening of 6 power devices
Lead to and turn off the moment, it is achieved three-phase output voltage or three-phase being exported the real-time of electric current and controls.Currently used relatively
For being SVPWM method widely, the method will be complete to each power device in each switch periods
Become No. 2 switch switchings (definition power device understands shutoffs from opening switching, or understands open-minded from shutoff switching,
It is No. 1 switch switching), and power device the most once switch switching all can cause certain power attenuation.When opening
When pass frequency is relatively low, power device switching loss can be ignored, but relatively low switching frequency can cause three-phase electricity
Pressure or current output waveform contain more harmonic content, while affecting Waveform sine, too increase filter
The burden of ripple electric current and cost.
In order to pursue the less output voltage of harmonic wave two and output electric current, it is generally required to improve switching frequency, but
Obviously can bring bigger power device switching loss, cause three-phase grid-connected inverter conversion efficiency to reduce.For
Further raising switching frequency, reduces switching loss, has employing discontinuous modula tion technology real in prior art
Show the reduction of switching loss on three-phase multi-electrical level inverter.In another kind of scheme, should by discontinuous modula tion
Use to achieve on active filter and preferably control effect.Also having a kind of scheme is to propose to be applied to three-phase
Unified type discontinuous modula tion technology on two-level inverter.Such scheme all uses in fundamental sine wave reference
Inject different moral zero-sequence component on the basis of voltage to realize, and each brachium pontis switch within a primitive period not
Action interval is 120 °.
Summary of the invention
The present invention is based on above one or more problem, it is provided that the PWM of a kind of permanent magnetism wind power generation system
Control method of grid-connected inverter, meritorious and idle in order to solve net side inverter output present in prior art
The problem that cannot decouple.
The PWM control method of grid-connected inverter of described permanent magnetism wind power generation system includes:
Sampling grid-connected current, filter capacitor electric current, the sampling period is T, obtains a grid-connected current base
M current sampling data I in period of wave TnetmWith M filter capacitor current value inetmWherein, M=L/T,
M=0,1,2 ..., M-1, current sampling data Inet00 phase point of corresponding grid-connected current first-harmonic, filter capacitor
Current sampling data inet00 phase point of corresponding grid-connected filter capacitor current first harmonics；
By described M current sampling data InetmSubtract each other with current feedback values, obtain the first error amount；
By described M filter capacitor current sampling data inetmSubtract each other with filter capacitor current feedback values, obtain
Two error amounts；
Described first error amount is multiplied with synchronizing signal through overregulating, obtains combining inverter current on line side and refer to
Make signal；
Described second error amount is carried out ratio resonance regulation, obtains filter capacitor current command signal；
Believe with filter capacitor current-order after combining inverter current on line side is regulated with described current command signal
Number it is added, then is multiplied by proportionality coefficient, obtains master control amount；
According to described master control amount, produce the dutycycle M inverter pulse width with the master control amount change of synthesis
Degree modulated signal PWM.
Further, magneto alternator system includes: main circuit, drive circuit, control circuit and auxiliary
Help circuit.
Further, described main circuit includes rectification circuit, capacitor filter and IPM inverter circuit.
Further, described combining inverter current on line side and described current command signal are through overcurrent outer shroud PI
Actuator regulates；
The proportionality coefficient of described pi regulator is:
The leading time coefficient of described pi regulator is:
Wherein: R is the outer loop resistance of electric current, and C is electric current outer shroud electric capacity, and L is electric current outer shroud inductance.
Further, described method also includes:
Gather electrical network three-phase voltage signal Uga、Ugb、Ugc, and inverter ac side three-phase current signal ia、ib、
ic；
By described electrical network three-phase voltage signal Uga、Ugb、UgcObtain biphase synchronous rotary through coordinate transform to sit
Mains voltage signal U under mark systemgdAnd Ugq, by described inverter ac side three-phase current signal ia、ib、ic
Ac-side current signal i under coordinate transform obtains biphase synchronous rotating framedAnd iq；
According to inverter mathematical model under three-phase static coordinate system, when inverter ac side three pole reactor not
During balance, set up inverter mathematical model under biphase synchronous rotating frame；
According to the mathematical model under described biphase synchronous rotating frame, set up the d of biphase synchronous rotating frame
The current loop controller that axle and q axle are effectively decoupled；
Under the conditions of inductance unbalance, three-phase PWM combining inverter is carried out according to described current loop controller
Uneoupled control.
Further, during described coordinate transform uses Clarke conversion, Park conversion or Park inverse transformation
A kind of.
Further, described inverter mathematical model under three-phase static coordinate system is:
Wherein, La、Lb、LcFor the three pole reactor of inverter ac side, Ra、Rb、RcFor three in circuit
Phase resistance, uga、ugb、ugcFor electrical network three-phase voltage, ua、ub、ucFor inverter ac side three-phase voltage,
uONFor the potential difference between inverter ac side neutral point and DC side negative pole.
Further, described inverter mathematical model under biphase synchronous rotating frame is:
Wherein: λqdAnd λdqIt is respectively d axle and the q shaft voltage coefficient of coup under biphase synchronous rotating frame,
ZdAnd ZqIt is respectively d axle and the inductive impedance of q axle, Z under biphase synchronous rotating frameqdAnd ZdqIt is respectively
Under biphase synchronous rotating frame, q axle is to the coupled impedance of d axle and the d axle coupled impedance to q axle；udWith
uqIt is respectively inverter ac side voltage signal d axle and q axle component under biphase synchronous rotating frame.
Further, the current loop control that the d axle of described biphase synchronous rotating frame and q axle are effectively decoupled
The input of device is AC biphase current signal and mains voltage signal, is output as biphase synchronous rotating frame
Lower inverter AC voltage set-point ud_refAnd uq_ref。
Further, the current loop control that the d axle of described biphase synchronous rotating frame and q axle are effectively decoupled
Device is:
Wherein, id_refAnd iq_refIt is respectively inverter ac side electric current d axle and q axle component set-point, kiFor integration
Coefficient, kpFor proportionality coefficient, RmFor inverter three-phase resistance meansigma methods.
The PWM control method of grid-connected inverter of the permanent magnetism wind power generation system that the present invention provides, by gathering also
Net electric current, the filter capacitor electric current multiple sampled values in cycle T, and multiple sampled values are carried out internal ring and
Outer shroud regulates, it is possible to effectively reduces the harmonic wave in net side inverter output electric current, reduces output waveform distortion,
Realize meritorious and idle uneoupled control, improve stability and the high efficiency of whole system.
Accompanying drawing explanation
Fig. 1 is the PWM control method of grid-connected inverter of the permanent magnetism wind power generation system of the embodiment of the present invention one
Flow chart；
Fig. 2 is the permanent magnetism wind power generation system structural representation of the embodiment of the present invention two；
Fig. 3 is the driving circuit structure schematic diagram of the embodiment of the present invention two；
Fig. 4 is the sample circuit structural representation of the embodiment of the present invention two.
Detailed description of the invention
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.If it should be noted that do not rushed
Prominent, each feature in the embodiment of the present invention and embodiment can be combined with each other, all in the protection of the present invention
Within the scope of.
Embodiment one
The embodiment of the present invention one provides the PWM control method of grid-connected inverter of a kind of permanent magnetism wind power generation system,
Described magneto alternator system includes: main circuit, drive circuit, control circuit and auxiliary circuit.Institute
State main circuit and include rectification circuit, capacitor filter and IPM inverter circuit.
As it is shown in figure 1, the method includes:
101, sampling grid-connected current, filter capacitor electric current, the sampling period is T, obtain one grid-connected
M current sampling data I in current first harmonics cycle TnetmWith M filter capacitor current value inetm.Wherein,
M=L/T, m=0,1,2 ..., M-1, current sampling data Inet00 phase point of corresponding grid-connected current first-harmonic,
Filter capacitor current sampling data inet00 phase point of corresponding grid-connected filter capacitor current first harmonics.
102, by described M current sampling data InetmSubtract each other with current feedback values, obtain the first error amount；
103, by described M filter capacitor current sampling data inetmSubtract each other with filter capacitor current feedback values,
To the second error amount；
104, described first error amount is multiplied with synchronizing signal through overregulating, obtains combining inverter net side electricity
Stream command signal；
105, described second error amount is carried out ratio resonance regulation, obtain filter capacitor current command signal；
106, refer to filter capacitor electric current after combining inverter current on line side being regulated with described current command signal
Make signal be added, then be multiplied by proportionality coefficient, obtain master control amount
Concrete, described combining inverter current on line side is adjusted through overcurrent outer shroud PI with described current command signal
Joint device regulation；
The proportionality coefficient of described pi regulator is:
The leading time coefficient of described pi regulator is:
Wherein: R is the outer loop resistance of electric current, and C is electric current outer shroud electric capacity, and L is electric current outer shroud inductance.
107, according to described master control amount, the dutycycle M inverter arteries and veins with the master control amount change of synthesis is produced
Rush bandwidth modulation signals PWM.
Wherein, dutycycle M is:
M=K × (M=K × (Iref-IL)
Wherein, K is proportionality coefficient, ILFor DC side inductive current steady-state value, IrefElectric current is given for DC side
Value.
The PWM control method of grid-connected inverter of the permanent magnetism wind power generation system that the present invention provides, by gathering also
Net electric current, the filter capacitor electric current multiple sampled values in cycle T, and multiple sampled values are carried out internal ring and
Outer shroud regulates, it is possible to effectively reduces the harmonic wave in net side inverter output electric current, reduces output waveform distortion,
Realize meritorious and idle uneoupled control, improve stability and the high efficiency of whole system.
Embodiment two
The embodiment of the present invention two provides the PWM control method of grid-connected inverter of a kind of permanent magnetism wind power generation system.
Wherein, this permanent magnetism wind power generation system as in figure 2 it is shown, include main circuit, drive circuit, control circuit and
Auxiliary circuit.Wherein main circuit is same by rectified three-phase circuit, intelligent power module inverter circuit and permanent magnetism
The compositions such as step motor；The 6 road pwm signals that DSP is generated by drive circuit are through light-coupled isolation rear drive
IPM power inverting device；Control circuit is core by TMS320F2812DSP control chip, for complete
Become the speed ring of permagnetic synchronous motor and the realization of the controller algorithm of electric current loop, the life of space vector PWM ripple
Become；Auxiliary circuit is made up of Hall element, current detection circuit and fault detect protection circuit etc., real
Existing motor speed and position detection, current detecting and system protection etc..
Wherein, the effect of drive circuit is to be amplified to be enough to drive power to open by the pwm pulse that DSP exports
Guan Guan, from the point of view of list is from principle, drive circuit acts primarily as switch power amplification, but its importance is
The switching characteristic of power switch pipe is closely related with the performance of drive circuit, and the drive circuit of excellent in design can
Improve the switching characteristic of power switch pipe, thus reduce switching loss, improve efficiency and the power of whole system
The reliability of device work.Therefore, the quality of drive circuit directly affects the performance of changer.The present embodiment
The device for power switching selected uses IPM (6MBP20RH060), the pwm pulse that DSP sends
Low and high level is respectively 0V and 3V, and the driving signal low and high level that IPM needs is respectively 0V and 15V,
And the IGBT conducting when the pulse input pin of 6MBP20RH060 is low level, turns off during high level.
As it is shown on figure 3, wherein, PWM is the pulse that DSP sends to the driving circuit structure of the present embodiment, fault
It it is the signal that sends of protection circuit.NAND gate uses the SN74F00D of TI company, and high speed photo coupling uses
HCPL4504, here, combines by optocoupler and NAND gate and not only can realize the amplification of pulse signal and negate,
And effectively achieve the electrical isolation of light current and main circuit.When IPM normally works, fault is high level.
When PWM is high level, optocoupler output VinFor low level, internal IGBT turns on, otherwise, work as PWM
When pulse is low level, VinFor the high level of 15V, internal IGBT turns off.Fault when IPM breaks down
Signal is low level, causes VinOutput high level turns off internal IGBT.Play external blockade PWM arteries and veins
The effect of punching.During moreover, it is desirable to turn off internal IGBT, one low level of fault pin can be added to
Block pwm pulse.
Control circuit includes that sample circuit, Clark convert, Park translation circuit, pi regulator control circuit
Generative circuit with pwm pulse.
Conventional current sample method has sample resistance method, current transformer method and Hall element method etc..Its
In, Hall element has advantages such as precision height, good linearity, bandwidth and response are fast, but Hall element valency
Lattice are expensive, and cost is high；Can there is electrical isolation problem in sample resistance method, need additional optoisolator or Magnetic isolation
Device, and power attenuation is big.In view of three-phase grid electric current is the power-frequency alternating-current amperage of approximate sine wave, use electricity
Current transformer can meet sampling request, and therefore, the present embodiment Current Transformer method is to grid-connected current, filter
Ripple capacitance current is sampled.On the one hand the function of current transformer realizes the electric of main circuit and control circuit
Isolation, on the other hand realizes the conversion to stator current and sampling.The output of current transformer is stator current
Bipolarity ac current signal after scaled, and the A/D modular converter of DSP can only gather 0-3V
Between electrode signal, therefore, it is also desirable to the output signal of current transformer modulated by sample circuit
The scope that can gather to DSP.
The sample circuit structure of the present embodiment is as shown in Figure 4.In Fig. 4, operational amplifier uses TI company
TL082, is powered by the power supply of ± 15V；T is Current Mutual Inductance TA14W-200.The output i of T1It it is net side electricity
Flow the ac current signal after reducing by conversion ratio；One voltage follower, resistance R1And R2Parallel connection do
Sampling resistor, by i1It is converted into voltage signal u1Output；Second level amplifier is by u1Amplitude be scaled to ± 1.5V,
Phase place keeps constant；Finally, the DC source of-15V and resistance R4In series one promote circuit, will
u1Promote 1.5V, obtain the electrode signal u that amplitude is 0-3V0。
It should be noted that in the design of current sampling circuit, for the use of current transformer, it is necessary to
Select suitable sampling resistor to obtain higher sampling precision, two inverse parallels two of the outfan of sample circuit
Pole pipe composition amplitude limiter circuit, by output voltage clamper in order to avoid damaging DSP between 0-3V.
The embodiment of the present invention two provides the PWM control method of grid-connected inverter of a kind of permanent magnetism wind power generation system.
Also comprise the steps: on the basis of embodiment one method
107, electrical network three-phase voltage signal U is gatheredga、Ugb、Ugc, and inverter ac side three-phase current signal
ia、ib、ic；
108, by described electrical network three-phase voltage signal Uga、Ugb、UgcTwo synchronised are obtained through coordinate transform
Mains voltage signal U under rotating coordinate systemgdAnd Ugq, by described inverter ac side three-phase current signal ia、
ib、icAc-side current signal i under coordinate transform obtains biphase synchronous rotating framedAnd iq；
In the present embodiment, described coordinate transform uses in Clarke conversion, Park conversion or Park inverse transformation
One.
109, according to inverter mathematical model under three-phase static coordinate system, when inverter ac side three-phase electricity
When sense is uneven, set up inverter mathematical model under biphase synchronous rotating frame；
In the present embodiment, described inverter mathematical model under three-phase static coordinate system is:
Wherein, La、Lb、LcFor the three pole reactor of inverter ac side, Ra、Rb、RcFor three in circuit
Phase resistance, uga、ugb、ugcFor electrical network three-phase voltage, ua、ub、ucFor inverter ac side three-phase voltage,
uONFor the potential difference between inverter ac side neutral point and DC side negative pole.
Described inverter mathematical model under biphase synchronous rotating frame is:
Wherein: λqdAnd λdqIt is respectively d axle and the q shaft voltage coefficient of coup under biphase synchronous rotating frame,
ZdAnd ZqIt is respectively d axle and the inductive impedance of q axle, Z under biphase synchronous rotating frameqdAnd ZdqIt is respectively
Under biphase synchronous rotating frame, q axle is to the coupled impedance of d axle and the d axle coupled impedance to q axle；udWith
uqIt is respectively inverter ac side voltage signal d axle and q axle component under biphase synchronous rotating frame.
110, according to the mathematical model under described biphase synchronous rotating frame, biphase synchronously rotating reference frame is set up
The current loop controller that the d axle of system and q axle are effectively decoupled；
In the present embodiment, the electric current loop control that the d axle of described biphase synchronous rotating frame and q axle are effectively decoupled
The input of device processed is AC biphase current signal and mains voltage signal, is output as biphase synchronously rotating reference frame
The lower inverter AC voltage set-point u of systemd_refAnd uq_ref。
Preferably, the current loop controller that the d axle of described biphase synchronous rotating frame and q axle are effectively decoupled
For:
Wherein, id_refAnd iq_refIt is respectively inverter ac side electric current d axle and q axle component set-point, kiFor integration
Coefficient, kpFor proportionality coefficient, RmFor inverter three-phase resistance meansigma methods.
111, under the conditions of inductance unbalance, three-phase PWM parallel network reverse is carried out according to described current loop controller
The uneoupled control of device.
The foregoing is only embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every
Utilize equivalent structure or equivalence flow process conversion that description of the invention and accompanying drawing content made, or directly or indirectly
It is used in other relevant technical fields, is the most in like manner included in the scope of patent protection of the present invention.
Claims (10)
1. the PWM control method of grid-connected inverter of a permanent magnetism wind power generation system, it is characterised in that institute
The method of stating includes:
Sampling grid-connected current, filter capacitor electric current, the sampling period is T, obtains a grid-connected current base
M current sampling data I in period of wave TnetmWith M filter capacitor current value inetmWherein, M=L/T,
M=0,1,2 ..., M-1, current sampling data Inet00 phase point of corresponding grid-connected current first-harmonic, filter capacitor
Current sampling data inet00 phase point of corresponding grid-connected filter capacitor current first harmonics；
By described M current sampling data InetmSubtract each other with current feedback values, obtain the first error amount；
By described M filter capacitor current sampling data inetmSubtract each other with filter capacitor current feedback values, obtain
Two error amounts；
Described first error amount is multiplied with synchronizing signal through overregulating, obtains combining inverter current on line side and refer to
Make signal；
Described second error amount is carried out ratio resonance regulation, obtains filter capacitor current command signal；
Believe with filter capacitor current-order after combining inverter current on line side is regulated with described current command signal
Number it is added, then is multiplied by proportionality coefficient, obtains master control amount；
According to described master control amount, produce the dutycycle M inverter pulse width with the master control amount change of synthesis
Degree modulated signal PWM.
2. the PWM control method of grid-connected inverter of permanent magnetism wind power generation system as claimed in claim 1,
It is characterized in that, magneto alternator system includes: main circuit, drive circuit, control circuit and auxiliary
Circuit.
3. the PWM control method of grid-connected inverter of permanent magnetism wind power generation system as claimed in claim 2,
It is characterized in that, described main circuit includes rectification circuit, capacitor filter and IPM inverter circuit.
4. the PWM control method of grid-connected inverter of permanent magnetism wind power generation system as claimed in claim 1,
It is characterized in that, described combining inverter current on line side is adjusted through overcurrent outer shroud PI with described current command signal
Joint device regulation；
The proportionality coefficient of described pi regulator is:
The leading time coefficient of described pi regulator is:
Wherein: R is the outer loop resistance of electric current, and C is electric current outer shroud electric capacity, and L is electric current outer shroud inductance.
5. the PWM control method of grid-connected inverter of permanent magnetism wind power generation system as claimed in claim 1,
It is characterized in that, described method also includes:
Gather electrical network three-phase voltage signal Uga、Ugb、Ugc, and inverter ac side three-phase current signal ia、ib、
ic；
By described electrical network three-phase voltage signal Uga、Ugb、UgcObtain biphase synchronous rotary through coordinate transform to sit
Mains voltage signal U under mark systemgdAnd Ugq, by described inverter ac side three-phase current signal ia、ib、ic
Ac-side current signal i under coordinate transform obtains biphase synchronous rotating framedAnd iq；
According to inverter mathematical model under three-phase static coordinate system, when inverter ac side three pole reactor not
During balance, set up inverter mathematical model under biphase synchronous rotating frame；
According to the mathematical model under described biphase synchronous rotating frame, set up the d of biphase synchronous rotating frame
The current loop controller that axle and q axle are effectively decoupled；
Under the conditions of inductance unbalance, three-phase PWM combining inverter is carried out according to described current loop controller
Uneoupled control.
6. the PWM control method of grid-connected inverter of permanent magnetism wind power generation system as claimed in claim 5,
It is characterized in that, described coordinate transform uses in Clarke conversion, Park conversion or Park inverse transformation
Kind.
7. the PWM control method of grid-connected inverter of permanent magnetism wind power generation system as claimed in claim 5,
It is characterized in that, described inverter mathematical model under three-phase static coordinate system is:
Wherein, La、Lb、LcFor the three pole reactor of inverter ac side, Ra、Rb、RcFor three in circuit
Phase resistance, uga、ugb、ugcFor electrical network three-phase voltage, ua、ub、ucFor inverter ac side three-phase voltage,
uONFor the potential difference between inverter ac side neutral point and DC side negative pole.
8. the PWM control method of grid-connected inverter of permanent magnetism wind power generation system as claimed in claim 5,
It is characterized in that, described inverter mathematical model under biphase synchronous rotating frame is:
Wherein: λqdAnd λdqIt is respectively d axle and the q shaft voltage coefficient of coup under biphase synchronous rotating frame,
ZdAnd ZqIt is respectively d axle and the inductive impedance of q axle, Z under biphase synchronous rotating frameqdAnd ZdqIt is respectively
Under biphase synchronous rotating frame, q axle is to the coupled impedance of d axle and the d axle coupled impedance to q axle；udWith
uqIt is respectively inverter ac side voltage signal d axle and q axle component under biphase synchronous rotating frame.
9. the PWM control method of grid-connected inverter of permanent magnetism wind power generation system as claimed in claim 5,
It is characterized in that, the current loop controller that the d axle of described biphase synchronous rotating frame and q axle are effectively decoupled
Input be AC biphase current signal and mains voltage signal, be output as under biphase synchronous rotating frame
Inverter ac side voltage set-point ud_refAnd uq_ref。
10. the PWM control method of grid-connected inverter of permanent magnetism wind power generation system as claimed in claim 9,
It is characterized in that, the current loop controller that the d axle of described biphase synchronous rotating frame and q axle are effectively decoupled
For:
Wherein, id_refAnd iq_refIt is respectively inverter ac side electric current d axle and q axle component set-point, kiFor integration
Coefficient, kpFor proportionality coefficient, RmFor inverter three-phase resistance meansigma methods.
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| CN111034017A (en) * | 2017-09-07 | 2020-04-17 | 三菱重工制冷空调系统株式会社 | Current estimation device, electric compressor, current estimation method, and motor current effective value estimation method |
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