CN107704012B - Photovoltaic DC-to-AC converter maximum power tracking method under a kind of non-uniform irradiation - Google Patents
Photovoltaic DC-to-AC converter maximum power tracking method under a kind of non-uniform irradiation Download PDFInfo
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- CN107704012B CN107704012B CN201711050562.7A CN201711050562A CN107704012B CN 107704012 B CN107704012 B CN 107704012B CN 201711050562 A CN201711050562 A CN 201711050562A CN 107704012 B CN107704012 B CN 107704012B
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Abstract
A kind of photovoltaic DC-to-AC converter maximum power tracking method under non-uniform irradiation comprising following steps: (1) inverter parameters initialize, and initialize inverter maximal power tracing parameter；(2) judge inverter current working status, if stable state, then carry out local maxima power tracking, otherwise enter step (3)；(3) judge whether photovoltaic matrix occurs uneven irradiation by irradiating detection, if so, carrying out global maximum power scanning, execute step (4), if it is not, thening follow the steps (2)；(4) global maximum power scans.The present invention is by judging whether there is uneven irradiation, and to uneven irradiation situation by the way of global maximum power scanning, without increasing hardware device, global maximum power scanning algorithm can efficiently be started, solves the Multi-maximum point maximal power tracing problem of photovoltaic array under non-uniform irradiation, the maximal power tracing ability of photovoltaic DC-to-AC converter is set to be adapted to different irradiation and temperature, to improve the power output of photovoltaic system.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, and in particular to photovoltaic DC-to-AC converter is maximum under to a kind of non-uniform irradiation
Power tracking method.
Background technique
With the decline of photovoltaic power generation cost and the promotion of efficiency, photovoltaic power generation is rapidly developed in recent years.Photovoltaic is inverse
For the case where 99% or more can be reached by becoming device nominal maximum power tracking efficiency, but the data are just for Uniform Irradiation.?
It irradiates in non-uniform situation, photovoltaic array may will form the P-V curve with multiple extreme points, to make traditional maximum
The failure of power tracking method.It is as shown in Figure 1 schematic diagram of the photovoltaic array by two kinds of situations of uneven irradiation, Fig. 2 is two kinds
P-V curve caused by photovoltaic array under uneven irradiation.The P-V curve of irradiation 1 as shown in Fig. 1 (a) produces multiple poles
It is worth point, the P-V curve of irradiation 2 shown in Fig. 1 (b) does not generate multiple extreme points.In the irradiation of Fig. 1 (a), the overall situation is most
It is high-power that in P-V curve, third extreme point, tradition maximum tracking enter irradiation not in the case where uniform irradiation from right to left
The maximum power point that uniform situation generally searches for is P-V curve first extreme point, therefore photovoltaic in the case from right to left
Square matrix output is serious to be reduced.
To solve the problems, such as maximal power tracing of the photovoltaic array under uneven irradiation, three classes maximum work is mainly used at present
Rate tracking technique, i.e. improvement conventional method, intelligent algorithm and the method based on photovoltaic array topological structure.Wherein improve tradition side
Method and intelligent algorithm are the common methods of current Multi-maximum point maximal power tracing, and these two kinds of methods all refer to algorithm and restart judgement
Process generally includes following several method: (1) being judged only with changed power；(2) only with electric current and triggered time
Judged；(3) judged using power and voltage；(4) judged using power and electric current；(5) voltage and electricity are used
The mode of stream is judged.These method majorities cannot distinguish between whether uneven irradiation has occurred, and be generally only to generate in irradiation
Algorithm search global maximum power is restarted after certain variation.If set judgement parameter is too small, it will cause algorithms repeatedly to weigh
It opens, to influence generating efficiency, parameter is excessive, and it will cause algorithms to restart susceptibility decline, and when irradiation variation but algorithm does not weigh
It opens, if occurring multiple extreme points at this time and operating point is not maximum power point, may seriously reduce photovoltaic array output power.
Summary of the invention
The object of the present invention is to provide photovoltaic DC-to-AC converter maximum power tracking method under a kind of non-uniform irradiation, solution is equal by no means
The Multi-maximum point maximal power tracing problem of photovoltaic array under even irradiation makes the maximal power tracing ability of photovoltaic DC-to-AC converter can be with
Different irradiation and temperature are adapted to, to improve the power output of photovoltaic system.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of photovoltaic DC-to-AC converter maximum power tracking method under non-uniform irradiation comprising following steps:
(1) inverter parameters initialize, and initialize inverter maximal power tracing parameter；
(2) judge power swing in the current preset time of inverter, voltage fluctuation and working condition (stable state/dynamic),
If power swing and voltage fluctuation are greater than preset value in preset time, and current working status is stable state, then carries out local maxima
Power tracking: using the local maxima power of PI variable step conductance increment method search inverter, (3) are otherwise entered step；
(3) judge whether photovoltaic matrix occurs uneven irradiation by irradiating detection, if so, carrying out global maximum power
Scanning executes step (4), if it is not, thening follow the steps (2)；
(4) global maximum power scans: setting scanning sequency according to electrical parameter, sets several references during the scanning process
Electrical parameter and scanning termination condition nearby carry out local maxima with reference to electrical parameter to each using PI variable step conductance increment method
Power scan, and each power extreme point with reference near electrical parameter is obtained, until triggering termination condition, output current record are complete
The voltage of office's maximum power point, enters step (2).
The present invention is swept by judging whether there is uneven irradiation, and to uneven irradiation situation using global maximum power
Whether the mode retouched can produce multiple power by uneven irradiation at the various temperature of accurate judgement without increasing hardware device
Extreme value, and sensitivity with higher (can be realized 0.01PmChanged power detection), can efficiently start global maximum
Power scan algorithm solves the Multi-maximum point maximal power tracing problem of photovoltaic array under non-uniform irradiation, makes photovoltaic inversion
The maximal power tracing ability of device is adapted to different irradiation and temperature, to improve the power output of photovoltaic system.
Further, the parameter includes parallel photovoltaic package count, tandem photovoltaic package count, photovoltaic module power temperature system
Number, photovoltaic module voltage temperature coefficient, photovoltaic module series-connected cell number, photovoltaic module maximum power point voltage, photovoltaic module are most
High-power electric current and maximum power.
Further, the step 2 includes following sub-step:
(2-1) judges power swing in the current preset time of inverter, voltage fluctuation and working condition (stable state/dynamic
State), if power swing and voltage fluctuation are greater than preset value in preset time, and current working status is stable state, then enters step
(2-2) otherwise enters step (3)；
(2-2) obtains duty ratio D (k):
If Δ D (k) Δ D (k-1) >=0, ifDuty ratio is set as D (k)=D (k-1)+Δ D (k),
IfDuty ratio is set as D (k)=D (k-1)+l Δ D (k), and wherein Δ D (k) is duty ratio adjusting step, root
It is selected according to the P-V slope of curve, K2For preset constant, l is step-length regulation coefficient, and
If present operating point is close to extreme point, i.e. Δ D (k) Δ D (k-1) < 0, then Δ D (k)=- Δ D (k-1)/2, duty
D (k)=D (k-1)+Δ D (k) is set as than D (k)；
The corresponding voltage of local maxima power is calculated in (2-3)VinIt (k) is kth time iteration
Inverter input voltage；
(2-4) exports current record local maxima power and its corresponding voltage.
As an improvement of the present invention, the step (3) judges whether photovoltaic matrix occurs unevenness by irradiating detection
The concrete mode of even irradiation are as follows: if when formula (1) and (2) any establishment, uneven irradiation as occurs,
| Δ V |=| Vpv-Vmpc| > Δ VSET (1)
ndw> 1 (2)
Wherein,VpvElectricity is inputted for inverter
Pressure, NserFor the series component number of photovoltaic group string, T is photovoltaic array temperature, Vmp,md,STCFor photovoltaic module maximum power under mark condition
Point voltage, NsFor series-connected cell number, βocFor voltage temperature coefficient, n is Diode Ideality Factor, and k is Bo Erciman constant, and q is
Electron charge, ImpFor photovoltaic array maximum power point electric current, Imp,STCFor photovoltaic array maximum power point electric current under mark condition, Δ
VSETFor preset reference value, ndwTo bypass photovoltaic module number, ndwJudged to obtain by photovoltaic array output voltage.
As an improvement of the present invention, the step (4) specifically includes following sub-step:
(4-1) is scanned from big to small by voltage, gives reference voltage VSET(nw), reference voltage are as follows:
nwInitial value is photovoltaic group string series component number Nser, T is photovoltaic array temperature, Vmp,md,STCFor photovoltaic group under mark condition
Part maximum power point voltage, NsFor series-connected cell number, βocFor voltage temperature coefficient, n is Diode Ideality Factor, k Bo Erci
Graceful constant, q are electron charge, ImpFor photovoltaic array maximum power point electric current, Imp,STCFor photovoltaic array maximum power under mark condition
Point electric current；
(4-2) searches for given reference voltage V using PI variable step conductance increment methodSET(nw) neighbouring power extreme point, it looks for
To after local maximum power point, the power and its corresponding voltage are recorded；
(4-3) enables nw=nw- 1, give the reference voltage V of next power extreme pointSET(nw), it executes step (4-2)；
(4-4) is greater than when new reference voltage less than the smallest MPPT voltage of inverter or the current input power of inverter
It when the estimated value of next extreme point power, stops search, exports the voltage of current global maximum power point, enter step (2).
Further, the step (4-2) includes following sub-step:
(4-2-1) obtains the duty cycle delta D of k iterationg(k) are as follows:
Dg(k)=Dg(k-1)+kg(k)ΔDg(k),
According toSelect duty ratio adjusting step Δ DgAnd material calculation regulation coefficient k (k),g(k),
The corresponding voltage of local maxima power is calculated in (4-2-2)VinIt (k) is kth time iteration
Inverter input voltage；
(4-2-3) records local maxima power and its corresponding voltage.
Further, in the step (4-4), the estimated value P of next extreme point powerc(T,nw- 1) are as follows:
N in formulaserFor the series component number of photovoltaic group string, T is photovoltaic array temperature, nwInitial value is the series connection of photovoltaic group string
Package count Nser, Pmp,STCFor the mark condition power of solar irradiation, TSTCThe mark condition temperature of solar irradiation, γmFor photovoltaic module power temperature
Spend coefficient.
Compared with prior art, the invention has the following advantages that
The present invention is swept by judging whether there is uneven irradiation, and to uneven irradiation situation using global maximum power
Whether the mode retouched can produce multiple power by uneven irradiation at the various temperature of accurate judgement without increasing hardware device
Extreme value, and sensitivity with higher (can be realized 0.01PmChanged power detection), can efficiently start global maximum
Power scan algorithm solves the Multi-maximum point maximal power tracing problem of photovoltaic array under non-uniform irradiation, makes photovoltaic inversion
The maximal power tracing ability of device is adapted to different irradiation and temperature, to improve the power output of photovoltaic system.
Detailed description of the invention
Fig. 1 is the two kinds of situations (a) and (b) that photovoltaic array receives uneven irradiation；
Fig. 2 is the P-V curve of two kinds of uneven irradiations (a) and (b)；
Fig. 3 is the flow chart of photovoltaic DC-to-AC converter maximum power tracking method under non-uniform irradiation of the present invention；
Fig. 4 is the schematic diagram of photovoltaic parallel in system structure；
Fig. 5 is photovoltaic DC-to-AC converter control block diagram；
Fig. 6 is maximal power tracing result figure of the present invention respectively in 25 DEG C and 50 DEG C under irradiation sudden change conditions；
Fig. 7 is maximal power tracing result figure of the present invention respectively in 25 DEG C and 50 DEG C under irradiation gradient conditions.
Specific embodiment
The contents of the present invention are described in further details with reference to the accompanying drawings and detailed description.It is understood that
It is that specific embodiment described herein is used only for explaining the present invention rather than limiting the invention.It further needs exist for illustrating
, for ease of description, only some but not all contents related to the present invention are shown in the drawings.
The present invention is suitable for irradiating photovoltaic power generation occasion that is complicated and being affected by uneven irradiation, such as large-scale light
Overhead utility and Photovoltaic Building Integration application model, present invention can apply to single-stages and twin-stage photovoltaic combining inverter.Here with
It is illustrated for twin-stage gird-connected inverter, photovoltaic parallel in system structure and photovoltaic DC-to-AC converter control block diagram are as shown in Figures 4 and 5.
Present invention is generally directed to photovoltaic arrays under uneven irradiation, not because of bypass diode and each tandem photovoltaic component output characteristics
Match and form multiple power extreme points, the detection of uneven irradiation is realized using judgment step, and increase using PI variable step conductance
Amount method quickly carries out coarse scanning to maximum power after triggering global maximum power scanning, and local maxima function is entered after search
Rate tracks process, is accurately tracked using PI variable step conductance increment method to maximum power point, realizes under different temperatures and irradiation
The maximal power tracing of photovoltaic array.Refer to that solar irradiation is 1000W/M under mentioned mark condition in the present invention2, temperature is
20 DEG C of operating condition.
Embodiment 1
Referring to FIG. 3, photovoltaic DC-to-AC converter maximum power tracking method under a kind of non-uniform irradiation comprising following steps:
(1) inverter parameters initialize, and initialize inverter maximal power tracing parameter；
The parameter includes parallel photovoltaic package count, tandem photovoltaic package count, photovoltaic module power temperature coefficient, photovoltaic group
Part voltage temperature coefficient, photovoltaic module series-connected cell number, photovoltaic module maximum power point voltage, photovoltaic module maximum power point electricity
Stream and maximum power.
(2) judge power swing in the current preset time of inverter, voltage fluctuation and working condition (stable state/dynamic),
If power swing and voltage fluctuation are greater than preset value in preset time, and current working status is stable state, then carries out local maxima
Power tracking: using the local maxima power of PI variable step conductance increment method search inverter, (3) are otherwise entered step；
Specifically, the step 2 includes following sub-step:
(2-1) judges power swing in the current preset time of inverter, voltage fluctuation and working condition (stable state/dynamic
State), if power swing and voltage fluctuation are greater than preset value in preset time, and current working status is stable state, then enters step
(2-2) otherwise enters step (3)；
(2-2) obtains duty ratio D (k):
If Δ D (k) Δ D (k-1) >=0, ifDuty ratio is set as D (k)=D (k-1)+Δ D (k),
IfDuty ratio is set as D (k)=D (k-1)+l Δ D (k), and wherein Δ D (k) is duty ratio adjusting step,
It is selected according to the P-V slope of curve, K2For preset constant, l is step-length regulation coefficient, and
If present operating point is close to extreme point, i.e. Δ D (k) Δ D (k-1) < 0, then Δ D (k)=- Δ D (k-1)/2, duty
D (k)=D (k-1)+Δ D (k) is set as than D (k)；
The corresponding voltage of local maxima power is calculated in (2-3)VinIt (k) is kth time iteration
Inverter input voltage；
(2-4) exports current record local maxima power and its corresponding voltage.
(3) judge whether photovoltaic matrix occurs uneven irradiation by irradiating detection, if so, carrying out global maximum power
Scanning executes step (4), if it is not, thening follow the steps (2)；
The step (3) judges whether photovoltaic matrix occurs the concrete mode of uneven irradiation by irradiating detection are as follows: if
When formula (1) and (2) any establishment, uneven irradiation as occurs,
| Δ V |=| Vpv-Vmpc| > Δ VSET (1)
ndw> 1 (2)
Wherein,VpvElectricity is inputted for inverter
Pressure, NserFor the series component number of photovoltaic group string, T is photovoltaic array temperature, Vmp,md,STCFor photovoltaic module maximum power under mark condition
Point voltage, NsFor series-connected cell number, βocFor voltage temperature coefficient, n is Diode Ideality Factor, and k is Bo Erciman constant, and q is
Electron charge, ImpFor photovoltaic array maximum power point electric current, Imp,STCFor photovoltaic array maximum power point electric current under mark condition, Δ
VSETFor preset reference value, ndwTo bypass photovoltaic module number, ndwJudged to obtain by photovoltaic array output voltage.
(4) global maximum power scans: setting scanning sequency according to electrical parameter, sets several references during the scanning process
Electrical parameter and scanning termination condition nearby carry out local maxima with reference to electrical parameter to each using PI variable step conductance increment method
Power scan, and each power extreme point with reference near electrical parameter is obtained, until triggering termination condition, output current record are complete
The voltage of office's maximum power point, enters step (2)；
Specifically, the step (4) specifically includes following sub-step:
(4-1) is scanned from big to small by voltage, gives reference voltage VSET(nw), reference voltage are as follows:
nwInitial value is photovoltaic group string series component number Nser, T is photovoltaic array temperature, Vmp,md,STCFor photovoltaic group under mark condition
Part maximum power point voltage, NsFor series-connected cell number, βocFor voltage temperature coefficient, n is Diode Ideality Factor, k Bo Erci
Graceful constant, q are electron charge, ImpFor photovoltaic array maximum power point electric current, Imp,STCFor photovoltaic array maximum power point under mark condition
Electric current；
(4-2) searches for given reference voltage V using PI variable step conductance increment methodSET(nw) neighbouring power extreme point, it looks for
To after local maximum power point, the power and its corresponding voltage are recorded；
Specifically, the step (4-2) includes following sub-step:
(4-2-1) obtains the duty cycle delta D of k iterationg(k) are as follows:
Dg(k)=Dg(k-1)+kg(k)ΔDg(k),
According toSelect duty ratio adjusting step Δ DgAnd material calculation regulation coefficient k (k),g(k),
The corresponding voltage of local maxima power is calculated in (4-2-2)VinIt (k) is kth time iteration
Inverter input voltage；
(4-2-3) records local maxima power and its corresponding voltage；
(4-3) enables nw=nw- 1, give the reference voltage V of next power extreme pointSET(nw), it executes step (4-2)；
(4-4) is greater than when new reference voltage less than the smallest MPPT voltage of inverter or the current input power of inverter
It when the estimated value of next extreme point power, stops search, exports the voltage of current global maximum power point, enter step (2),
Wherein
The estimated value P of next extreme point powerc(T,nw- 1) are as follows:
N in formulaserFor the series component number of photovoltaic group string, T is photovoltaic array temperature, nwInitial value is the series connection of photovoltaic group string
Package count Nser, Pmp,STCFor the mark condition power of solar irradiation, TSTCThe mark condition temperature of solar irradiation, γmFor photovoltaic module power temperature
Spend coefficient.
The present invention is swept by judging whether there is uneven irradiation, and to uneven irradiation situation using global maximum power
Whether the mode retouched can produce multiple power by uneven irradiation at the various temperature of accurate judgement without increasing hardware device
Extreme value, and sensitivity with higher (can be realized 0.01PmChanged power detection), can efficiently start global maximum
Power scan algorithm solves the Multi-maximum point maximal power tracing problem of photovoltaic array under non-uniform irradiation, makes photovoltaic inversion
The maximal power tracing ability of device is adapted to different irradiation and temperature, to improve the power output of photovoltaic system.
According to the above rate-determining steps, by taking 100kW DC/DC+DC/AC three-phase grid photovoltaic DC-to-AC converter as an example, in Matlab/
Simulink builds photovoltaic system simulation model, and the parameter of twin-stage grid-connected inverting system is as shown in table 1.By each group of photovoltaic array
String is equally divided into 4 groups, every group of uniform irradiation.To the maximum work under solar irradiation step, linear change and two kinds of operating temperatures
Rate tracking is emulated.For solar irradiation as shown in table 2 and table 3, temperature takes 25 DEG C and 50 DEG C.The present invention is in the case where irradiating sudden change conditions
MPPT maximum power point tracking result is as shown in fig. 6, as shown in Figure 7 in the case where irradiating gradient conditions.
The bipolar gird-connected inverter simulation parameters of table 1
Solar irradiation Spline smoothing is arranged in 2 emulation experiment of table
Solar irradiation linear change is arranged in 3 emulation experiment of table
Wherein,
Above-described embodiment is only to illustrate this patent and not limits technical solution described in this patent；Therefore, although
This specification has been carried out detailed description to this patent referring to above-mentioned each embodiment, still, the ordinary skill of this field
Personnel should be appreciated that and still can be modified or replaced equivalently to this patent；And all do not depart from this patent spirit and
The technical solution and its improvement of range, should all cover in the scope of the claims of this patent.
Claims (6)
1. photovoltaic DC-to-AC converter maximum power tracking method under a kind of non-uniform irradiation, it is characterised in that: the following steps are included:
(1) inverter parameters initialize, and initialize inverter maximal power tracing parameter；
(2) power swing, voltage fluctuation and working condition in the current preset time of inverter are judged, if power in preset time
Fluctuation and voltage fluctuation are greater than preset value, and current working status is stable state, then carries out local maxima power tracking: being become using PI
Step-length conductance increment method searches for the local maxima power of inverter, otherwise enters step (3)；
(3) judge whether photovoltaic matrix occurs uneven irradiation by irradiating detection, swept if so, carrying out global maximum power
It retouches, executes step (4), if it is not, thening follow the steps (2)；
(4) global maximum power scans: setting scanning sequency according to electrical parameter, sets several during the scanning process with reference to electricity ginseng
Number and scanning termination condition nearby carry out local maxima power with reference to electrical parameter to each using PI variable step conductance increment method
Scanning, and each power extreme point with reference near electrical parameter is obtained, until triggering termination condition, the output current record overall situation is most
The voltage of high-power point, enters step (2)；
The step (2) includes following sub-step:
(2-1) judges power swing, voltage fluctuation and working condition in the current preset time of inverter, if preset time internal strength
Rate fluctuation and voltage fluctuation are greater than preset value, and current working status is stable state, then enters step (2-2), otherwise enter step
(3)；
(2-2) obtains duty ratio D (k):
If Δ D (k) Δ D (k-1) >=0, ifDuty ratio is set as D (k)=D (k-1)+Δ D (k), ifDuty ratio is set as D (k)=D (k-1)+l Δ D (k), and wherein Δ D (k) is duty ratio adjusting step, according to
The selection of the P-V slope of curve, K2For preset constant, l is step-length regulation coefficient, and
If present operating point is close to extreme point, i.e. Δ D (k) Δ D (k-1) < 0, then Δ D (k)=- Δ D (k-1)/2, duty ratio D
(k) it is set as D (k)=D (k-1)+Δ D (k)；
The corresponding voltage of local maxima power is calculated in (2-3)VinIt (k) is the inversion of kth time iteration
Device input voltage；
(2-4) exports current record local maxima power and its corresponding voltage.
2. photovoltaic DC-to-AC converter maximum power tracking method under non-uniform irradiation according to claim 1, it is characterised in that: institute
Stating parameter includes parallel photovoltaic package count, tandem photovoltaic package count, photovoltaic module power temperature coefficient, photovoltaic module voltage temperature
Coefficient, photovoltaic module series-connected cell number, photovoltaic module maximum power point voltage, photovoltaic module maximum power point electric current and maximum work
Rate.
3. photovoltaic DC-to-AC converter maximum power tracking method under non-uniform irradiation according to claim 1, it is characterised in that: institute
It states step (3) and judges whether photovoltaic matrix occurs the concrete mode of uneven irradiation by irradiating detection are as follows: if formula (1) and (2)
When any establishment, uneven irradiation as occurs,
| Δ V |=| Vpv-Vmpc| > Δ VSET (1)
ndw> 1 (2)
Wherein,VpvFor inverter input voltage,
NserFor the series component number of photovoltaic group string, T is photovoltaic array temperature, Vmp,md,STCFor photovoltaic module maximum power point electricity under mark condition
Pressure, NsFor series-connected cell number, βocFor voltage temperature coefficient, n is Diode Ideality Factor, and k is Bo Erciman constant, and q is electronics
Charge, ImpFor photovoltaic array maximum power point electric current, Imp,STCFor photovoltaic array maximum power point electric current under mark condition, Δ VSETIt is pre-
If reference value, ndwTo bypass photovoltaic module number, ndwJudged to obtain by photovoltaic array output voltage.
4. photovoltaic DC-to-AC converter maximum power tracking method under non-uniform irradiation according to claim 1, it is characterised in that: institute
It states step (4) and specifically includes following sub-step:
(4-1) is scanned from big to small by voltage, gives reference voltage VSET(nw), reference voltage are as follows:
nwInitial value is photovoltaic group string series component number Nser, T is photovoltaic array temperature, Vmp,md,STCMost for photovoltaic module under mark condition
High-power voltage, NsFor series-connected cell number, βocFor voltage temperature coefficient, n is Diode Ideality Factor, k Bo Ercimanchang
Number, q is electron charge, ImpFor photovoltaic array maximum power point electric current, Imp,STCFor photovoltaic array maximum power point electricity under mark condition
Stream；
(4-2) searches for given reference voltage V using PI variable step conductance increment methodSET(nw) neighbouring power extreme point, find office
After portion's maximum power point, the power and its corresponding voltage are recorded；
(4-3) enables nw=nw- 1, give the reference voltage V of next power extreme pointSET(nw), it executes step (4-2)；
(4-4) is less than the smallest MPPT voltage of inverter or the current input power of inverter greater than next when new reference voltage
It when the estimated value of a extreme point power, stops search, exports the voltage of current global maximum power point, enter step (2).
5. photovoltaic DC-to-AC converter maximum power tracking method under non-uniform irradiation according to claim 4, it is characterised in that: institute
Stating step (4-2) includes following sub-step:
(4-2-1) obtains the duty cycle delta D of k iterationg(k) are as follows:
Dg(k)=Dg(k-1)+kg(k)ΔDg(k),
According toSelect duty ratio adjusting step Δ DgAnd material calculation regulation coefficient k (k),g(k),
The corresponding voltage of local maxima power is calculated in (4-2-2)VinIt (k) is the inverse of kth time iteration
Become device input voltage；
(4-2-3) records local maxima power and its corresponding voltage.
6. photovoltaic DC-to-AC converter maximum power tracking method under non-uniform irradiation according to claim 4, it is characterised in that: institute
It states in step (4-4), the estimated value P of next extreme point powerc(T,nw- 1) are as follows:
N in formulaserFor the series component number of photovoltaic group string, T is photovoltaic array temperature, nwInitial value is photovoltaic group string series component number
Nser, Pmp,STCFor the mark condition power of solar irradiation, TSTCFor the mark condition temperature of solar irradiation, γmFor photovoltaic module power temperature system
Number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711050562.7A CN107704012B (en) | 2017-10-31 | 2017-10-31 | Photovoltaic DC-to-AC converter maximum power tracking method under a kind of non-uniform irradiation |
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