CN107994773B - A kind of control method and system of photovoltaic DC-to-AC converter Boost circuit - Google Patents
A kind of control method and system of photovoltaic DC-to-AC converter Boost circuit Download PDFInfo
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- CN107994773B CN107994773B CN201711247472.7A CN201711247472A CN107994773B CN 107994773 B CN107994773 B CN 107994773B CN 201711247472 A CN201711247472 A CN 201711247472A CN 107994773 B CN107994773 B CN 107994773B
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Abstract
The disclosure of the invention a kind of improved control method and system of photovoltaic DC-to-AC converter Boost circuit of the invention.A kind of control method of photovoltaic DC-to-AC converter Boost circuit includes the following steps: S1, obtains photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbWith inductor current feedback signal iLfb；S2, photovoltaic array voltage refer to vpvrefSubtract the voltage feedback signal vpvfbVoltage error signal is obtained, the voltage error signal is through Voltage loop adjuster GvcObtain inductive current reference signal iLref, by the inductive current reference signal iLrefWith the inductor current feedback signal iLfbSubstitute into electric current loop adjuster GicObtain adjustment signal vc1；S3, by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfbWith the modulated signal v of a upper switch periodsmSubstitute into feedforward regulator GffMiddle processing obtains adjustment signal vc2；S4, by the adjustment signal vc1And vc2Addition obtains new modulated signal vm, and it is sent into PWM generator, generate the PWM drive signal of Boost switching tube.
Description
Technical field
The present invention relates to photovoltaic DC-to-AC converter Boost circuit control field, in particular to a kind of photovoltaic DC-to-AC converter Boost circuit
Control method and system.
Background technique
It is the distributed generation system of representative as one of the major way of renewable energy utilization using wind energy and solar energy,
Can dominate existing power grid economical operation and, increasingly increase in electric system using specific gravity.Boost transformation
Device is simple as a kind of structure, and the wider booster type circuit converter of use occasion is widely used in the light of various power grades
It lies prostrate in inverter, adjusts photovoltaic array output voltage, and realize maximum power point tracking (MPPT).Steady dc voltage control
Inverter safety and stability high-efficiency and economic is run with good MPP tracking most important.Therefore, how Boost is realized
The stability contorting of DC voltage, improving to the anti-interference ability of photovoltaic array voltage and load conversion is to improve Boost
The key of control performance.
Fig. 1 shows a kind of structure chart of conventional photovoltaic inverter in the prior art, which includes
Photovoltaic array, Boost, dc-link capacitance Cbus, gird-connected inverter, public electric wire net and digitial controller and its periphery
Circuit etc..Wherein, Boost is by input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodebComposition；Hvp,
HvbAnd HiRespectively photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLThe equivalent biography of hardware sampling processing circuit
Delivery function, generally low-pass first order filter, according to Hvp, HvbAnd HiPhotovoltaic array voltage feedback signal can be respectively obtained
vpvfb, DC bus-bar voltage feedback signal vbusfbWith inductor current feedback signal iLfb, the physical significance of these signals is signal
vpv、vbusAnd iLSwitch periods average value；GvcAnd GicRespectively Voltage loop adjuster and electric current loop adjuster.
Its specific control process is illustrated now in conjunction with Fig. 2.Fig. 2 shows the biographies that adoption status space average method obtains
Control block diagram of the Boost of uniting under CCM (inductor current continuous mode) mode, wherein GdTo use digital control institute
The sampling delay and PWM modulation of introducing postpone, generally 1.5 sampling period Ts；ZLAnd ZCRespectively filter inductance, filtered electrical
The impedance of appearance.As can be known from Fig. 2, photovoltaic array voltage refers to vpvrefSubtract voltage feedback signal vpvfbObtain voltage error letter
Number, which passes through adjuster Gvc, obtain inductive current reference signal iLref；Inductive current refers to iLrefIt is anti-to subtract electric current
Feedback signal iLfbCurrent error signal is obtained, which passes through adjuster Gic, and divided by DC bus-bar voltage feedback signal
vbusfb, obtain modulated signal vm, which obtains Boost switching tube driving signal, passes through tune after PWM generator
Section switching tube turns on and off the time, so that inductive current iLIt tracks inductive current and refers to iLref, so that photovoltaic array exports
Voltage vpvIt can be with floating voltage reference signal vpvref。
From figure 2 it can be seen that the control method of voltage and current double closed-loop despite the use of, due to signal vpvOccur simultaneously
In inner and outer ring, causing current inner loop and outer voltage, there are close coupling relationships, not only increase design of Regulator difficulty, and be easy
Generating system resonance can not effectively improve system bandwidth.
In addition, the modeling of converter does not consider Converter in DCM (discontinuous mode) mould in the control block diagram of Fig. 2
Actual motion state under formula, leads to the mismatch of model and actual motion state, and then control parameter is caused to mismatch, and reduces control
Precision processed, or even cause system unstable.
Summary of the invention
In view of the above technical problems, the present invention provide a kind of photovoltaic DC-to-AC converter Boost circuit improved control method and
System.
On the one hand, the technical solution adopted by the present invention are as follows:
A kind of control method of photovoltaic DC-to-AC converter Boost circuit, includes the following steps:
S1, photovoltaic array voltage feedback signal v is obtainedpvfb, DC bus-bar voltage feedback signal vbusfbIt is anti-with inductive current
Feedback signal iLfb；
S2, photovoltaic array voltage refer to vpvrefSubtract the voltage feedback signal vpvfbVoltage error signal is obtained, it is described
Voltage error signal is through Voltage loop adjuster GvcObtain inductive current reference signal iLref, by the inductive current reference signal
iLrefWith the inductor current feedback signal iLfbSubstitute into electric current loop adjuster GicObtain adjustment signal vc1；
S3, by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfbWith a upper switch periods
Modulated signal vmSubstitute into feedforward regulator GffMiddle processing obtains adjustment signal vc2；
S4, by the adjustment signal vc1And vc2Addition obtains new modulated signal vm, and it is sent into PWM generator, it generates
The PWM drive signal of Boost switching tube.
In some embodiments, the step S3 includes:
Compare the voltage feedback signal vpvfbWith the DC bus-bar voltage feedback signal vbusfbBetween size,
If vpvfb≥vbusfb, then the feedforward regulator output signal is enabled to be
vc2=0
If vpvfb< vbusfb, then carry out following steps:
By the modulated signal v of a upper switch periodsmSubstitution and and the DC bus-bar voltage feedback signal vbusfbIt is multiplied, obtains
To vm×vbusfbAmount, and by the difference of the amount and the DC bus-bar voltage feedback signal and the photovoltaic array voltage feedback signal
Value vbusfb-vpvfbIt makes comparisons,
If vbusfb-vpvfb≤vm×vbusfb, then the feedforward regulator output signal is enabled to be
vc2=vbusfb-vpvfb
If vbusfb-vpvfb> vm×vbusfb, then the feedforward regulator output signal is enabled to be
vc2=vm×vbusfb。
In some embodiments, the step S3 further comprise respectively solve Boost in ccm mode and/
Or the adjustment signal v under DCM modec2。
In some embodiments, the step S3 further comprises:
Compare the voltage feedback signal vpvfbWith the DC bus-bar voltage feedback signal vbusfbBetween size,
If vpvfb≥vbusfb, then the feedforward regulator output signal is enabled to be
vc2=0
If vpvfb< vbusfb, then carry out following steps:
By the modulated signal v of a upper switch periodsmSubstitution and and the DC bus-bar voltage feedback signal vbusfbIt is multiplied, obtains
To vm×vbusfbAmount, and by the difference of the amount and the DC bus-bar voltage feedback signal and the photovoltaic array voltage feedback signal
Value vbusfb-vpvfbIt makes comparisons,
If vbusfb-vpvfb≤vm×vbusfb, then carry out solving the adjustment signal v of Boost in ccm modec2's
Step；
And/or
If vbusfb-vpvfb> vm×vbusfb, then carry out solving the adjustment signal v of Boost in dcm modec2's
Step.
In some embodiments, adjustment signal v of the Boost under CCM state is solvedc2The step of specifically include:
S311, Boost modeling:
Enable LpvIndicate the filter inductance of Boost, iLThe filter inductance electric current of Boost is indicated, when t is indicated
Between, vpvIndicate photovoltaic array voltage, vbusIndicate that DC bus-bar voltage, d indicate modulated signal vmIt is modulated after PWM generator
Duty cycle signals out, CpvIndicate the input capacitance of Boost, Δ TsIndicate inductive current iLIt drops to required for 0
Time, while being also diode DbTurn-on time, Δ indicate diode DbConducting dutycycle signal, then Boost exists
State equation such as formula (1-1) under CCM mode,
Enabling photovoltaic array equivalent output impedance is zpv, then the input current i of BoostpvIt is equivalent with formula (1-2),
Formula (1-2) is substituted into formula (1-1), and seeks Laplace transform, obtains mathematics of the Boost at CCM
Model is as follows,
In formula (1-3), s indicates Laplace operator；
S312, feedforward regulator design:
Design adjuster meets formula (1-4), realizes the inner and outer ring decoupling of Boost in ccm mode,
Thus, Boost in ccm mode when, feedforward regulator GffAs shown in formula (1-5),
Gff=vbus-vpv(1-5)；
S313, feedforward regulator are realized:
Boost includes input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb；Hvp、HvbAnd Hi
Respectively photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLHardware sampling processing circuit equivalent transfer function,
According to Hvp、HvbAnd HiRespectively obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbAnd inductance
Current feedback signal iLfb, vpvfb、vbusfbAnd iLfbIt is expressed as signal vpv、vbusAnd iLSwitch periods average value；vmFor
Boost switching tube modulated signal, duty ratio are d, ignore high frequency switching noise, then d=vm；
If vbusfb-vpvfb≤vm×vbusfb, then the feedforward regulator output signal is enabled to be
vc2=vbusfb-vpvfb。
In some embodiments, adjustment signal v of the Boost under DCM state is solvedc2The step of specifically include:
S321, Boost modeling:
Enable LpvIndicate the filter inductance of Boost, iLThe filter inductance electric current of Boost is indicated, when t is indicated
Between, vpvIndicate photovoltaic array voltage, vbusIndicate that DC bus-bar voltage, d indicate modulated signal vmIt is modulated after PWM generator
Duty cycle signals out, CpvIndicate the input capacitance of Boost, Δ TsIndicate inductive current iLIt drops to required for 0
Time, while being also diode DbTurn-on time, Δ indicate indicate diode DbConducting dutycycle signal, then Boost convert
The state equation of device in dcm mode such as formula (2-1),
Enabling photovoltaic array equivalent output impedance is zpv, then the input current i of BoostpvIt is equivalent with formula (2-2),
Formula (2-2) is substituted into formula (2-1), and seeks Laplace transform, obtains mathematics of the Boost at DCM
Model is as follows,
In formula (2-3), s indicates Laplace operator；
S322, feedforward regulator design:
Design adjuster meets formula (2-4), realizes the inner and outer ring decoupling of Boost in dcm mode,
Thus, Boost in dcm mode when, feedforward regulator GffAs shown in formula (2-5),
Gff=(d+ Δ) (vbus-vpv) (2-5)
Formula (2-6) dissolves to obtain formula (2-7),
When Boost is under DCM, d+ Δ < 1, then Boost should meet,
vbus-vpv> dvbus (2-8)
Formula (2-7) is substituted into formula (2-4) at this time, obtains feedforward regulator in dcm mode are as follows:
Gff=dvbus(2-9)；
S323, feedforward regulator are realized:
Boost includes input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb；Hvp、HvbAnd Hi
Respectively photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLHardware sampling processing circuit equivalent transfer function,
According to Hvp、HvbAnd HiRespectively obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbAnd inductance
Current feedback signal iLfb, vpvfb、vbusfbAnd iLfbIt is expressed as signal vpv、vbusAnd iLSwitch periods average value；vmFor
Boost switching tube modulated signal, duty ratio are d, ignore high frequency switching noise, then d=vm；
If vbusfb-vpvfb> vm×vbusfb, then the feedforward regulator output signal is enabled to be
vc2=vm×vbusfb。
On the other hand, The technical solution adopted by the invention is as follows:
A kind of control system of photovoltaic DC-to-AC converter Boost circuit control method described in application, including photovoltaic array,
Boost, dc-link capacitance Cbus, gird-connected inverter, public electric wire net, digitial controller and digitial controller periphery electricity
Road, the Boost include input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb, the number control
Device processed includes:
Voltage loop adjuster Gvc, for photovoltaic array voltage to be referred to vpvrefSubtract the voltage feedback signal vpvfbIt obtains
Voltage error signal processing be inductive current reference signal iLref；
Electric current loop adjuster Gic, it is used for the inductive current reference signal iLrefWith inductor current feedback signal iLfbPlace
Reason obtains adjustment signal vc1；
Feedforward regulator Gff, it is used for the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfb
With the modulated signal v of a upper switch periodsmProcessing obtains adjustment signal vc2；And
Arithmetic unit is used for the adjustment signal vc1And vc2Addition obtains new modulated signal vm；
The digitial controller peripheral circuit includes:
PWM generator, for the new modulated signal v based on the receivedmIt generates to the switching tube SbPWM driving
Signal.
In some embodiments, the digitial controller peripheral circuit further include:
Sampling processing circuit Hvp, it is used for photovoltaic array voltage vpvEquivalent process is photovoltaic array voltage feedback signal
vpvfb；
Sampling processing circuit Hvb, it is used for DC bus-bar voltage vbusEquivalent process is DC bus-bar voltage feedback signal
vbusfb；And
Sampling processing circuit Hi, it is used for inductive current iLEquivalent process is inductor current feedback signal iLfb。
In some embodiments, the sampling processing circuit Hvp, the sampling processing circuit HvbWith the sampling processing electricity
Road HiRespectively low-pass first order filter or multiple order low pass filter.
The present invention uses above scheme, has the advantages that compared with prior art
(1), without considering influence of the two kinds of operating statuses of DCM mode and CCM mode of Boost to adjuster,
Simplify design of Regulator；
(2), can effectively to system resonance carry out active damping, extension system control bandwidth, improve voltage, electric current with
Track performance and interference free performance.
Detailed description of the invention
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical solution of the present invention
It is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of photovoltaic DC-to-AC converter Boost control structure schematic diagram in the prior art.
Fig. 2 is a kind of photovoltaic DC-to-AC converter Boost control block diagram in the prior art.
Fig. 3 a, 3b are respectively the waveform correlation that Boost works under CCM and DCM mode.
Fig. 4 is a kind of control system schematic diagram of photovoltaic DC-to-AC converter Boost according to the present invention.
Fig. 5 a, 5b are respectively Boost steady-state operation under DCM, CCM mode using control method of the invention
When experimental waveform.
Boost change when Fig. 6 a, 6b are respectively the photovoltaic array output power bust for using control method of the invention, uprush
Parallel operation runs waveform.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be understood by the person skilled in the art.It should be noted that the explanation for these embodiments is used to help
Understand the present invention, but and does not constitute a limitation of the invention.In addition, involved in the various embodiments of the present invention described below
And to technical characteristic can be combined with each other as long as they do not conflict with each other.
On the one hand, the present invention provides a kind of control method of photovoltaic DC-to-AC converter Boost circuit.The control method includes as follows
Step:
S1, photovoltaic array voltage feedback signal v is obtainedpvfb, DC bus-bar voltage feedback signal vbusfbIt is anti-with inductive current
Feedback signal iLfb；
S2, photovoltaic array voltage refer to vpvrefSubtract the voltage feedback signal vpvfbVoltage error signal is obtained, it is described
Voltage error signal is through Voltage loop adjuster GvcObtain inductive current reference signal iLref, by the inductive current reference signal
iLrefWith the inductor current feedback signal iLfbSubstitute into electric current loop adjuster GicObtain adjustment signal vc1；
S3, by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfbWith a upper switch periods
Modulated signal vmSubstitute into feedforward regulator GffMiddle processing obtains adjustment signal vc2；
S4, by the adjustment signal vc1And vc2Addition obtains new modulated signal vm, and it is sent into PWM generator, it generates
The PWM drive signal of Boost switching tube.
On the other hand, the present invention also provides a kind of controls of photovoltaic DC-to-AC converter Boost circuit control method described in application
System.Referring to shown in Fig. 4, which includes photovoltaic array 1, Boost 2, DC bus 3, dc-link capacitance
Cbus, gird-connected inverter 4, public electric wire net 5, digitial controller 6 and digitial controller peripheral circuit.The Boost is by defeated
Enter capacitor Cpv, filter inductance Lpv, switching tube SbAnd sustained diodebComposition.The digitial controller 6 includes:
Voltage loop adjuster Gvc, for photovoltaic array voltage to be referred to vpvrefSubtract the voltage feedback signal vpvfbIt obtains
Voltage error signal processing be inductive current reference signal iLref；
Electric current loop adjuster Gic, it is used for the inductive current reference signal iLrefWith inductor current feedback signal iLfbPlace
Reason obtains adjustment signal vc1；
Feedforward regulator Gff, being used for will be by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal
vbusfbWith the modulated signal v of a upper switch periodsmProcessing obtains adjustment signal vc2；And
Arithmetic unit is used for the adjustment signal vc1And vc2Addition obtains new modulated signal vm；
The digitial controller peripheral circuit includes:
PWM generator (PWM), for the new modulated signal v based on the receivedmIt generates to the switching tube SbPWM
Driving signal.
The digitial controller peripheral circuit further include:
Sampling processing circuit Hvp, it is used for photovoltaic array voltage vpvEquivalent process is photovoltaic array voltage feedback signal
vpvfb；
Sampling processing circuit Hvb, it is used for DC bus-bar voltage vbusEquivalent process is DC bus-bar voltage feedback signal
vbusfb；And
Sampling processing circuit Hi, it is used for inductive current iLEquivalent process is inductor current feedback signal iLfb。
It is described in detail below with reference to step 3 of Fig. 3 a and Fig. 3 b to above-mentioned control method.
1, Boost models:
Fig. 3 a, Fig. 3 b are respectively exemplary operation waveform of the Boost under CCM and DCM state, wherein TsFor transformation
Device switch periods；D is modulated signal vmThe duty cycle signals modulated after PWM generator；Δ T in Fig. 3 bsFor inductive current
iLTime required for dropping to 0, while being also diode DbTurn-on time.It can be obtained using State-space Averaging Principle, in CCM
Stateful equation such as formula (1) under mode,
Stateful equation such as formula (2) in dcm mode,
In Boost shown in Fig. 1 or 4, enabling photovoltaic array equivalent output impedance is zpv, then Boost is defeated
Enter electric current ipvFormula (3) Approximate Equivalent can be used
(3) formula is substituted into (1) formula and (2) formula, and seeks Laplace transform, then can obtain Boost in CCM and
Mathematical model under DCM mode is as follows
It is in ccm mode
It is in dcm mode
2, feedforward regulator designs:
Mathematical model of the Boost under CCM and DCM mode is analyzed, if design adjuster meets in ccm mode
Formula (6), formula (7), then may be implemented the decoupling of Boost inner and outer ring in dcm mode.
So feedforward regulator G can be designedffUnder Boost CCM mode are as follows:
Gff=vbus-vpv (8)
It is in dcm mode
Gff=(d+ Δ) (vbus-vpv) (9)
3, feedforward regulator simplifies:
By in Fig. 3 b it is found that
Dissolve,
Since Boost is in DCM mode, d+ Δ < 1, then Boost should meet at this time:
vbus-vpv< dvbus (12)
Formula (11) are substituted into formula (7) at this time, obtain feedforward regulator in dcm mode are as follows:
Gff=dvbus (13)
4, feedforward regulator is realized:
Fig. 4 show the control system schematic diagram of the photovoltaic DC-to-AC converter Boost circuit using control method of the present invention, mainly
By photovoltaic array 1, Boost 2, dc-link capacitance Cbus, gird-connected inverter 4, public electric wire net 5 and digitial controller 6 and
The composition such as its peripheral circuit.Wherein, Boost 2 is mainly by input capacitance Cpv, filter inductance Lpv, switching tube SbAnd afterflow
Diode DbComposition；Hvp, HvbAnd HiRespectively photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLHardware is adopted
Sample processing circuit, generally low-pass first order filter, according to equivalent transfer function Hvp、HvbAnd HiPhotovoltaic array can be respectively obtained
Voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbWith inductor current feedback signal iLfb, the physics of these signals
Meaning is signal vpv、vbusAnd iLSwitch periods average value；GvcAnd GicRespectively Voltage loop adjuster and electric current loop adjuster,
Generally use proportional plus integral control strategy；vmFor Boost switching tube modulated signal, required switch can be obtained by PWM generator
Driving signal, duty ratio are d, ignore high frequency switching noise, then have d=vm。
According to formula (8) and formula (12), step S3 specifically comprises the following steps:
(1), compare feedback signal vpvfbAnd vbusfbBetween size, if vpvfb≥vbusfb, then feedforward regulator output letter is enabled
Number it is
vc2=0；
(2) if, feedback signal vpvfbAnd vbusfbMeet vpvfb< vbusfb, then carry out following steps:
1. by modulated signal vmSubstitution and and DC bus-bar voltage vbusfbIt is multiplied, obtains vm×vbusfbAmount, and by the amount with
DC bus-bar voltage and photovoltaic array voltage difference vbusfb-vpvfbIt makes comparisons, if meeting vbusfb-vpvfb≤vm×vbusfb, then enable
Feedforward regulator output signal is
vc2=vbusfb-vpvfb；
2. if meeting vbusfb-vpvfb> vm×vbusfb, then the feedforward regulator output signal is enabled to be
vc2=vm×vbusfb。
Embodiment
The influence that a specific example is given below to illustrate feedforward regulator to system performance, major parameter are as follows:
Photovoltaic array MPP point voltage Vpv=200V；
Network voltage Vg=230V；
Specified input current Ipv=15A；
Switching frequency fs=20kHz；
Filter inductance Lpv=0.78mH；
Input capacitance Cpv=14 μ F；
Photovoltaic array and DC bus-bar voltage signal sampling conditioning circuit transmission function
Inductor current signal over-sampling modulate circuit transmission function
Practical photovoltaic array is simulated using programmable optical photovoltaic array simulation source, sets MPP point voltage as 200V；It adopts simultaneously
Public electric wire net voltage is simulated with Programmable AC Power Source, sets network voltage as Vg=230V, sine degree are good.
The equal the operation is stable of inverter, effectively demonstrates the practicability of control method of the present invention.
Fig. 5 a, 5b are respectively experimental waveform of the Boost under DCM, CCM mode when steady-state operation, steady operation
Stablize, non-generating system resonance.CH1 is photovoltaic array voltage v in figurepvWaveform；CH3 is DC bus-bar voltage vbusWaveform；CH4
For inductive current iLWaveform.
Boost runs waveform when Fig. 6 a, 6b are respectively photovoltaic array output power bust, uprush, and CH1 is in figure
Photovoltaic array voltage vpvWaveform；CH3 is DC bus-bar voltage vbusWaveform；CH4 is inductive current iLWaveform.It can from figure
Out, when photovoltaic array output power is mutated, Boost quickly can export electric current i by tracking arraypvVariation, photovoltaic
Array voltage vpvFluctuate small, dynamic response is rapid, and vibrates for generating system, and inverter the operation is stable effectively demonstrates this hair
The practicability of bright control method.
The above embodiments merely illustrate the technical concept and features of the present invention, is a kind of preferred embodiment, and purpose exists
It cans understand the content of the present invention and implement it accordingly in person skilled in the art, protection of the invention can not be limited with this
Range.Equivalent transformation or modification made by all Spirit Essences according to the present invention, should all cover protection scope of the present invention it
It is interior.
Claims (9)
1. a kind of control method of photovoltaic DC-to-AC converter Boost circuit, which comprises the steps of:
S1, photovoltaic array voltage feedback signal v is obtainedpvfb, DC bus-bar voltage feedback signal vbusfbBelieve with inductor current feedback
Number iLfb；
S2, photovoltaic array voltage refer to vpvrefSubtract the voltage feedback signal vpvfbObtain voltage error signal, the voltage
Error signal is through Voltage loop adjuster GvcObtain inductive current reference signal iLref, by the inductive current reference signal iLrefWith
The inductor current feedback signal iLfbSubstitute into electric current loop adjuster GicObtain adjustment signal vc1；
S3, by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfbWith the tune of a upper switch periods
Signal v processedmSubstitute into feedforward regulator GffMiddle processing obtains adjustment signal vc2；
S4, by the adjustment signal vc1And vc2Addition obtains new modulated signal vm, and it is sent into PWM generator, it generates Boost and opens
Close the PWM drive signal of pipe.
2. control method according to claim 1, which is characterized in that the step S3 includes:
Compare the voltage feedback signal vpvfbWith the DC bus-bar voltage feedback signal vbusfbBetween size,
If vpvfb≥vbusfb, then the feedforward regulator output signal is enabled to be
vc2=0
If vpvfb< vbusfb, then carry out following steps:
By the modulated signal v of a upper switch periodsmSubstitution and and the DC bus-bar voltage feedback signal vbusfbIt is multiplied, obtains vm
×vbusfbAmount, and by the difference of the amount and the DC bus-bar voltage feedback signal and the photovoltaic array voltage feedback signal
vbusfb-vpvfbIt makes comparisons,
If vbusfb-vpvfb≤vm×vbusfb, then the feedforward regulator output signal is enabled to be
vc2=vbusfb-vpvfb
If vbusfb-vpvfb> vm×vbusfb, then the feedforward regulator output signal is enabled to be
vc2=vm×vbusfb。
3. control method according to claim 1, which is characterized in that the step S3 further comprises solving respectively
Adjustment signal v of the Boost in ccm mode and/or under DCM modec2。
4. control method according to claim 3, which is characterized in that the step S3 further comprises:
Compare the voltage feedback signal vpvfbWith the DC bus-bar voltage feedback signal vbusfbBetween size,
If vpvfb≥vbusfb, then the feedforward regulator output signal is enabled to be
vc2=0
If vpvfb< vbusfb, then carry out following steps:
By the modulated signal v of a upper switch periodsmSubstitution and and the DC bus-bar voltage feedback signal vbusfbIt is multiplied, obtains vm
×vbusfbAmount, and by the difference of the amount and the DC bus-bar voltage feedback signal and the photovoltaic array voltage feedback signal
vbusfb-vpvfbIt makes comparisons,
If vbusfb-vpvfb≤vm×vbusfb, then carry out solving the adjustment signal v of Boost in ccm modec2The step of；
And/or
If vbusfb-vpvfb> vm×vbusfb, then carry out solving the adjustment signal v of Boost in dcm modec2The step of.
5. control method according to claim 4, which is characterized in that solve adjusting of the Boost under CCM state
Signal vc2The step of specifically include:
S311, Boost modeling:
Enable LpvIndicate the filter inductance of Boost, iLIndicate that the filter inductance electric current of Boost, t indicate the time,
vpvIndicate photovoltaic array voltage, vbusIndicate that DC bus-bar voltage, d indicate modulated signal vmIt is modulated after PWM generator
Duty cycle signals, CpvIndicate the input capacitance of Boost, Δ TsIndicate inductive current iLTime required for dropping to 0,
It is simultaneously also diode DbTurn-on time, Δ indicate diode DbConducting dutycycle signal, then Boost is in CCM mould
State equation such as formula (1-1) under formula,
Enabling photovoltaic array equivalent output impedance is zpv, then the input current i of BoostpvIt is equivalent with formula (1-2),
Formula (1-2) is substituted into formula (1-1), and seeks Laplace transform, obtains mathematical model of the Boost at CCM
It is as follows,
In formula (1-3), s indicates Laplace operator；
S312, feedforward regulator design:
Design adjuster meets formula (1-4), realizes the inner and outer ring decoupling of Boost in ccm mode,
Thus, Boost in ccm mode when, feedforward regulator GffAs shown in formula (1-5),
Gff=vbus-vpv(1-5)；
S313, feedforward regulator are realized:
Boost includes input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb；Hvp、HvbAnd HiRespectively
For photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLHardware sampling processing circuit equivalent transfer function, according to
Hvp、HvbAnd HiRespectively obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbAnd inductive current
Feedback signal iLfb, vpvfb、vbusfbAnd iLfbIt is expressed as signal vpv、vbusAnd iLSwitch periods average value；vmFor Boost
Switching tube modulated signal, duty ratio are d, ignore high frequency switching noise, then d=vm；
If vbusfb-vpvfb≤vm×vbusfb, then the feedforward regulator output signal is enabled to be
vc2=vbusfb-vpvfb。
6. control method according to claim 4, which is characterized in that solve adjusting of the Boost under DCM state
Signal vc2The step of specifically include:
S321, Boost modeling:
Enable LpvIndicate the filter inductance of Boost, iLIndicate that the filter inductance electric current of Boost, t indicate the time,
vpvIndicate photovoltaic array voltage, vbusIndicate that DC bus-bar voltage, d indicate modulated signal vmIt is modulated after PWM generator
Duty cycle signals, CpvIndicate the input capacitance of Boost, Δ TsIndicate inductive current iLTime required for dropping to 0,
It is simultaneously also diode DbTurn-on time, Δ indicate diode DbConducting dutycycle signal, then Boost is in DCM mould
State equation such as formula (2-1) under formula,
Enabling photovoltaic array equivalent output impedance is zpv, then the input current i of BoostpvIt is equivalent with formula (2-2),
Formula (2-2) is substituted into formula (2-1), and seeks Laplace transform, obtains mathematical model of the Boost at DCM
It is as follows,
In formula (2-3), s indicates Laplace operator；
S322, feedforward regulator design:
Design adjuster meets formula (2-4), realizes the inner and outer ring decoupling of Boost in dcm mode,
Thus, Boost in dcm mode when, feedforward regulator GffAs shown in formula (2-5),
Gff=(d+ Δ) (vbus-vpv) (2-5)
Formula (2-6) dissolves to obtain formula (2-7),
When Boost is under DCM, d+ Δ < 1, then Boost should meet,
vbus-vpv> dvbus (2-8)
Formula (2-7) is substituted into formula (2-4) at this time, obtains feedforward regulator in dcm mode are as follows:
Gff=dvbus(2-9)；
S323, feedforward regulator are realized:
Boost includes input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb；Hvp、HvbAnd HiRespectively
For photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLHardware sampling processing circuit equivalent transfer function, according to
Hvp、HvbAnd HiRespectively obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbAnd inductive current
Feedback signal iLfb, vpvfb、vbusfbAnd iLfbIt is expressed as signal vpv、vbusAnd iLSwitch periods average value；vmFor Boost
Switching tube modulated signal, duty ratio are d, ignore high frequency switching noise, then d=vm；
If vbusfb-vpvfb> vm×vbusfb, then the feedforward regulator output signal is enabled to be
vc2=vm×vbusfb。
7. a kind of control system of photovoltaic DC-to-AC converter Boost circuit control method of application as described in claim 1-6 is any, packet
Include photovoltaic array, Boost, dc-link capacitance Cbus, gird-connected inverter, public electric wire net, digitial controller and number control
Device peripheral circuit processed, the Boost include input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb,
It is characterized in that, the digitial controller includes:
Voltage loop adjuster Gvc, for photovoltaic array voltage to be referred to vpvrefSubtract the voltage feedback signal vpvfbObtained electricity
Holding up difference signal processing is inductive current reference signal iLref；
Electric current loop adjuster Gic, it is used for the inductive current reference signal iLrefWith inductor current feedback signal iLfbIt handles
To adjustment signal vc1；
Feedforward regulator Gff, it is used for the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfbWith it is upper
The modulated signal v of one switch periodsmProcessing obtains adjustment signal vc2；And
Arithmetic unit is used for the adjustment signal vc1And vc2Addition obtains new modulated signal vm；
The digitial controller peripheral circuit includes:
PWM generator, for the new modulated signal v based on the receivedmIt generates to the switching tube SbPWM drive signal.
8. control system according to claim 7, which is characterized in that the digitial controller peripheral circuit further include:
Sampling processing circuit Hvp, it is used for photovoltaic array voltage vpvEquivalent process is photovoltaic array voltage feedback signal vpvfb；
Sampling processing circuit Hvb, it is used for DC bus-bar voltage vbusEquivalent process is DC bus-bar voltage feedback signal vbusfb；With
And
Sampling processing circuit Hi, it is used for inductive current iLEquivalent process is inductor current feedback signal iLfb。
9. the control system according to claim 8, which is characterized in that the sampling processing circuit Hvp, described adopt
Sample processing circuit HvbWith the sampling processing circuit HiFor single order or multiple order low pass filter.
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| CN109449886B (en) * | 2018-11-23 | 2024-02-23 | 深圳古瑞瓦特新能源有限公司 | Photovoltaic inverter control method and system |
| CN109546961B (en) * | 2018-12-12 | 2020-09-01 | 西南交通大学 | Single-sensor photovoltaic module optimizer and control method thereof |
| CN110543703B (en) * | 2019-08-19 | 2021-05-14 | 华南理工大学 | Quasi-resonant converter modeling analysis method considering different time scales |
| CN110729892A (en) * | 2019-10-24 | 2020-01-24 | 苏州海鹏科技有限公司 | Boost controller based on PWM-PFM hybrid modulation and control method |
| CN111245359B (en) * | 2020-01-20 | 2021-10-08 | 上海发电设备成套设计研究院有限责任公司 | Control method of cascade photovoltaic inverter unit module device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843020A (en) * | 2012-09-06 | 2012-12-26 | 南京航空航天大学 | Method for inhibiting second harmonic current of preceding-stage inverter of two-stage inverter and control circuit of preceding-stage inverter of two-stage inverter |
| CN102916572A (en) * | 2012-06-12 | 2013-02-06 | 华中科技大学 | Control method and system for inhibiting secondary ripple current and improving dynamic characteristic |
| CN103780068A (en) * | 2014-01-15 | 2014-05-07 | 南京航空航天大学 | Inhibition method for input second-harmonic current of two-level single-phase inverter |
| US9602001B1 (en) * | 2015-11-06 | 2017-03-21 | National Cheng Kung University | Buck converter with a variable-gain feedback circuit for transient responses optimization |
-
2017
- 2017-12-01 CN CN201711247472.7A patent/CN107994773B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916572A (en) * | 2012-06-12 | 2013-02-06 | 华中科技大学 | Control method and system for inhibiting secondary ripple current and improving dynamic characteristic |
| CN102843020A (en) * | 2012-09-06 | 2012-12-26 | 南京航空航天大学 | Method for inhibiting second harmonic current of preceding-stage inverter of two-stage inverter and control circuit of preceding-stage inverter of two-stage inverter |
| CN103780068A (en) * | 2014-01-15 | 2014-05-07 | 南京航空航天大学 | Inhibition method for input second-harmonic current of two-level single-phase inverter |
| US9602001B1 (en) * | 2015-11-06 | 2017-03-21 | National Cheng Kung University | Buck converter with a variable-gain feedback circuit for transient responses optimization |
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