CN103036464B - Photovoltaic array topological structure, grid-connected system based on photovoltaic array topological structure and photovoltaic array control method - Google Patents
Photovoltaic array topological structure, grid-connected system based on photovoltaic array topological structure and photovoltaic array control method Download PDFInfo
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- CN103036464B CN103036464B CN201210519150.4A CN201210519150A CN103036464B CN 103036464 B CN103036464 B CN 103036464B CN 201210519150 A CN201210519150 A CN 201210519150A CN 103036464 B CN103036464 B CN 103036464B
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Abstract
The invention discloses a photovoltaic array topological structure, a grid-connected system based on the photovoltaic array topological structure and a photovoltaic array control method. A photovoltaic array comprises a plurality of parallel photovoltaic branch circuits, wherein each photovoltaic branch circuit comprises a module branch circuit and a compensation branch circuit, each module branch circuit is formed by successive series connection of a blocking diode, N photovoltaic modules and a capacitor, and each compensation branch circuit comprises N inductors and N insulated gate bipolar translator (IGBT) bridge arms. All IGBT bridge arms are in parallel connection with the module branch circuit. Each IGBT bridge arm is composed of two IGBTs. N midpoints corresponding to the N IGBT bridge arms are respectively connected with N cathode end points of the N photovoltaic modules through the N inductors. According to the photovoltaic array topological structure, the grid-connected system based on the photovoltaic array topological structure and the photovoltaic array control method, the photovoltaic modules are enabled to reach maximum power output, the problem of power mismatching of the photovoltaic array in a shadow is effectively solved, and output power of the photovoltaic array is improved.
Description
Technical field
The present invention relates to a kind of photovoltaic array topological structure, grid-connected system and control method, belong to technical field of photovoltaic power generation.
Background technology
The energy is the material base of human survival and development, critical effect is played in social development, but, along with socioeconomic development, the demand of people to the energy grows with each passing day on the one hand, on the other hand people have suffered from the huge challenge that the problem of environmental pollution that caused by energy shortage problem and energy resource consumption causes, and generation of electricity by new energy technology becomes the study hotspot seeking to solve energy problem both at home and abroad.Solar energy is a kind of clean, free of contamination natural energy resources, and photovoltaic power generation technology is just obtaining propagation and employment widely.
The power output of single photovoltaic module is less, in order to meet the requirement of load capacity, usually photovoltaic module is carried out series and parallel, forms the photovoltaic array that can export relatively high power.Photovoltaic array produces electric energy under solar irradiation, in ideal conditions can the output electric energy of long-time stable, but in the operational environment of actual complex, due to Adjacent Buildings, trees, the existence such as cloud layer, easily on photovoltaic array, form shade, make array partial radiation remitted its fury, namely WBR is uneven, now photovoltaic array performance depreciation, power output reduces greatly, the photovoltaic module of crested part even can become load, generate heat and consumed power, likely make battery generation avalanche breakdown further and damage battery, greatly reduce operational efficiency and the fail safe of photovoltaic generating system.Therefore, when designing photovoltaic generating system, considering the local shades condition of photovoltaic array, design being optimized to photovoltaic array, there is important practical significance.
The traditional structure of photovoltaic array is in assembly series arm, a first series connection blocking diode, when preventing full array output voltage too low, power send and causes damage to photovoltaic array, then to the photovoltaic cell that each (or several) connect, configure a bypass diode in parallel, preventing under local shades condition, due to power mismatch, there is hot spot phenomenon in photovoltaic series-connected cell.The working method of photovoltaic array is, when uniform illumination, bypass diode is in reverse cut-off, and photovoltaic cell normally works; Under a certain photovoltaic cell is in crested situation; because photogenerated current reduces; component voltage becomes negative pressure; bypass diode conducting now in parallel with it; protect photovoltaic cell not to be reversed avalanche current and to puncture; but now photovoltaic cell bears back-pressure and becomes load, consumed energy, the power output of array is reduced.
Traditional photovoltaic array structure is actual is the normal operation that ensure that photovoltaic array, and allows the percentage of batteries consumed energy covered by shade, is not a kind of economic, effective optimal way.Further, under random shadowed condition, due to the existence of bypass diode, the voltage power output characteristic of photovoltaic array is complicated, and power voltage curve has multiple Local Extremum, controls to also result in difficulty to the MPPT maximum power point tracking of photovoltaic.Therefore, be necessary to design a kind of novel photovoltaic array topological structure, grid-connected system and control method.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of photovoltaic array topological structure, grid-connected system and control method, this photovoltaic array topological structure, grid-connected system and control method can make photovoltaic module reach maximum power output, and effectively solve the power mismatch problem of photovoltaic array under shadowed condition, improve the power output of photovoltaic array.
The technical solution of invention is as follows:
A kind of photovoltaic array topological structure, photovoltaic array comprises many photovoltaic branch roads in parallel, each photovoltaic branch road comprises assembly branch road and compensates branch road, and assembly props up route blocking diode, N number of photovoltaic module and an electric capacity and is in series successively, and compensating circuit comprises N number of inductance and N number of IGBT brachium pontis; All IGBT brachium pontis all with assembly branch circuit parallel connection; Each IGBT brachium pontis is made up of two IGBT; N number of mid point that N number of IGBT brachium pontis is corresponding is connected to N number of negative pole end points place of N number of photovoltaic module respectively by N number of inductance; N be more than or equal to 2 integer.
Described N is 3.
Based on a photovoltaic array control method for aforesaid photovoltaic array topological structure, comprise (1) current compensation process and (2) voltage compensation procedure;
(1) current compensation process is:
Current compensation refers to adopt the IGBT brachium pontis described in N-1 to carry out current compensation;
To each the IGBT brachium pontis in N-1 IGBT brachium pontis before each photovoltaic branch road, all implement following control:
Obtain inductance L
ielectric current I
li, with offset current I
li_refrelatively, then by stagnant chain rate comparatively, the control signal G of switching tube (Vi, Vin) on i-th IGBT brachium pontis is obtained
li, namely work as I
li_ref-I
li<-0.1, makes the conducting of lower brachium pontis IGBT (i.e. Vin), works as I
li_ref-I
li> 0.1, makes brachium pontis IGBT (Vi) conducting, as-0.1 < I
li_ref-I
li< 0.1, control signal is 0, upper and lower bridge arm IGBT not conductings;
Wherein, offset current I
li_refi.e. i-th inductance L
ion the size of current that should inject, and I
li_ref=I
mi-I
mi+1, I
miit is the maximum power electric current of i-th photovoltaic module;
(2) voltage compensation procedure:
Voltage compensation refers to and carries out voltage compensation based on N number of IGBT brachium pontis to the electric capacity in photovoltaic branch road;
The bucking voltage size of jth bar photovoltaic branch road is U
pvj_ref=U
pvm-U
pvmj, j=1,2 ..., M, M are the total number of photovoltaic branch road;
Wherein branch road maximum power voltage U
pvm=max{U
pvmj, wherein
u
mirefer to the maximum power voltage of jth bar photovoltaic branch road i-th photovoltaic module;
Control procedure is: for each photovoltaic branch road, be all implemented as follows control:
The capacitance voltage U of detection branch
psj, with bucking voltage U
pvj_refrelatively, after the first pi regulator, compare with the first triangular wave, obtain N number of IGBT brachium pontis (the i.e. V of switching tube
n, V
nn) control signal G
c1, comparison value is greater than the first triangular wave then makes lower brachium pontis IGBT (V
nn) conducting, be less than the first triangular wave and then make brachium pontis IGBT (V
n) conducting.
The proportionality coefficient P of the first pi regulator
ps=0.2, integral coefficient I
ps=100; First triangle wave frequency is 10kHz, [in this patent, all triangular wave amplitudes are all change in 0-1, hereby illustrate].
Based on a grid-connected system for aforementioned photovoltaic array topological structure, described photovoltaic array is connected with three phase network with LC output filter by DC/DC DC chopper circuit, inverter successively.
6. grid-connected system according to claim 5, is characterized in that, it is characterized in that, described N is 3; Described inverter is the inverter controlled based on voltage, current double closed-loop.
7. the control method of grid-connected system according to claim 5 or 6, is characterized in that, comprises (A) photovoltaic array control method and (B) parallel network reverse control method;
(A) photovoltaic array control method comprises current compensation process and voltage compensation procedure;
(1) current compensation process is:
Current compensation refers to adopt N-1 IGBT brachium pontis to carry out current compensation;
To each the IGBT brachium pontis in N-1 IGBT brachium pontis before each photovoltaic branch road, all implement following control:
Obtain inductance L
ielectric current I
li, with offset current I
li_refrelatively, then by stagnant chain rate comparatively, the control signal G of switching tube (Vi, Vin) on i-th IGBT brachium pontis is obtained
li, namely work as I
li_ref-I
li<-0.1, makes the conducting of lower brachium pontis IGBT (i.e. Vin), works as I
li_ref-I
li> 0.1, makes brachium pontis IGBT (Vi) conducting, as-0.1 < I
li_ref-I
li< 0.1, control signal is 0, upper and lower bridge arm IGBT not conductings;
Wherein, offset current I
li_refi.e. i-th inductance L
ion the size of current that should inject, I
li_ref=I
mi-I
mi+1, I
miit is the maximum power electric current of i-th photovoltaic module;
(2) voltage compensation procedure:
Voltage compensation refers to and carries out voltage compensation based on N number of IGBT brachium pontis to the electric capacity in photovoltaic branch road;
The bucking voltage size of jth bar photovoltaic branch road is U
pvj_ref=U
pvm-U
pvmj, j=1,2 ..., M, M are the total number of photovoltaic branch road;
Wherein branch road maximum power voltage U
pvm=max{U
pvmj, wherein
u
mirefer to the maximum power voltage of jth bar photovoltaic branch road i-th photovoltaic module;
Control procedure is: for each photovoltaic branch road, be all implemented as follows control:
The capacitance voltage U of detection branch
psj, with bucking voltage U
pvj_refrelatively, after the first pi regulator, compare with the first triangular wave, obtain N number of IGBT brachium pontis (the i.e. V of switching tube
n, V
nn) control signal G
c1, comparison value is greater than the first triangular wave then makes lower brachium pontis IGBT (V
nn) conducting, be less than the first triangular wave and then make brachium pontis IGBT (V
n) conducting;
(B) be parallel network reverse control method:
A, B, C three-phase of inverter is controlled respectively:
By DC side voltage of converter U
dCwith setting voltage U
dC_refcomparatively, [U
dC_refgeneral value is 800V] relative error by second pi regulator control, result is multiplied by the sinusoidal signal synchronous with corresponding phase (as A phase) line voltage, and [it is 1 that PLL extracts sinusoidal wave amplitude, be exactly a unit signal], as inverter output current command signal I
inf, detect inverter output current I
in, with I
infrelatively, error controls through the 3rd pi regulator, then compares with the second triangular wave, obtains the control signal G of inverter
vSI, the break-make of control inverter switching device, works as G
vSI> 0, control the upper brachium pontis IGBT conducting of corresponding phase (as A phase), lower brachium pontis IGBT turns off; Work as G
vSI< 0, in control, brachium pontis IGBT turns off, lower brachium pontis IGBT conducting.
The proportionality coefficient P of the second pi regulator
dc=0.2, integral coefficient I
dc=25; The proportionality coefficient P of the 3rd pi regulator
in=0.5, integral coefficient I
in=300; Second triangle wave frequency is 10kHz.
Photovoltaic array can form photovoltaic parallel in system jointly with DC/DC DC chopper circuit, inverter circuit, output filter, electrical network.Described blocking diode is connected in assembly branch road, prevents electric current from oppositely causing damage to photovoltaic array; Electric capacity compensates branch voltage, maintains the balance of each branch road of array; DC/DC DC chopper circuit regulates DC side voltage of converter, makes photovoltaic array reach maximum power output; Inverter circuit adopts voltage, current double closed-loop to control, and reaches the object of inversion grid connection; LC output filter, the harmonic wave in elimination inverter output waveforms.This photovoltaic array topological structure, owing to adding compensating circuit in photovoltaic branch road, respectively assembly electric current and branch voltage are compensated, each assembly can be made to be operated in maximum power point, improve the operational efficiency of assembly, photovoltaic power mismatch under elimination local shades condition, improves fail safe and the power output of photovoltaic array.Described control method comprises offset current, bucking voltage controls, and obtains the offset current needed for branch road and voltage; Inversion grid connection double-closed-loop control, ensures that inverter exports and is accurately connected to the grid.
Beneficial effect:
Photovoltaic array topological structure of the present invention, grid-connected system and control method, by owing to adding compensating circuit in photovoltaic branch road, respectively assembly electric current and branch voltage are compensated, each assembly can be made to be operated in maximum power point, improve the operational efficiency of assembly, photovoltaic power mismatch under elimination local shades condition, improves fail safe and the power output of photovoltaic array.Described control method comprises offset current, bucking voltage controls, and obtains the offset current needed for branch road and voltage; Inversion grid connection double-closed-loop control, ensures that inverter exports and is accurately connected to the grid.
The outstanding effect that the present invention has is as follows:
1) adopt the compensating circuit of inductance, IGBT composition, simple possible, be easy to realize; Ensure the stable operation of array;
2) at assembly lower end access inductance, can the electric current of balanced component under local shades condition, make each assembly of branch road all power outputs, solve the power mismatch problem of photovoltaic module under local shades condition;
3) assembly electric current and branch voltage are compensated, assembly is run at maximum power point, and maintain the stable of branch voltage, make each assembly play maximum efficiency, improve the power output of photovoltaic array.
Accompanying drawing explanation
Fig. 1 photovoltaic parallel in system structural representation;
Fig. 2 photovoltaic array compensatory control flow chart;
Fig. 3 branch road compensating current control block diagram;
Fig. 4 branch road bucking voltage control block diagram;
Fig. 5 inversion grid connection control block diagram;
Fig. 6 simulated effect comparison diagram.(figure a is conventional photovoltaic array output power curve, and figure b is new photovoltaic array output power curve of the present invention)
Embodiment
Below with reference to the drawings and specific embodiments, the present invention is described in further details:
Embodiment 1:
Fig. 1 is photovoltaic parallel in system structure chart, is made up of photovoltaic array, DC/DC DC chopper circuit, inverter circuit, output filter and electrical network.Here analyze for the photovoltaic array be made up of 2 branch circuit parallel connections, and be that example is described to Article 1 branch structure, Article 1, prop up route M1, M2, M3 tri-photovoltaic module compositions, D1 is diode, C1 is electric capacity, is worth for 1000uF, L1, L2, L3 are inductance, value is respectively 3mH, 3mH, 5mH, and V1, V2, V3 and V1n, V2n, V3n are switching tube IGBT.Inverter direct-flow side capacitance is 4700uF, filter capacitance 400uF, inductance value 2mH.
Fig. 2 is photovoltaic array compensatory control flow chart.
Current Control and voltage control are divided into the control of photovoltaic array branch road:
1) photovoltaic branch current controls.When photovoltaic array is under local shades condition, if the maximum power electric current of photovoltaic module M1, M2, M3 is respectively I
m1, I
m2, I
m3, because assembly maximum power electric current is unequal, i.e. I
m1≠ I
m2≠ I
m3, in order to make each assembly be operated in maximum power point, then each node should meet node current law, can inject certain electric current, compensate electrical component stream inductive branch, and the upper size of current that should inject of inductance L 1, L2 is respectively I
l1_ref=I
m1-I
m2, I
l2_ref=I
m2-I
m3.[L3, the need of Injection Current, as needs, injects how many.Please illustrate.] L3 is control to voltage, control signal is voltage, Fig. 4 explanation
Fig. 3 is branch road compensating current control block diagram, is described here for the current compensation of assembly M2, obtains the electric current I of inductance L 1 branch road
l1, with offset current I
l1_refrelatively, then by stagnant chain rate compared with [stagnant chain rate compared with parameter, please provide], hysteresis band is set to 0.1A, obtains the control signal G of switching tube V1, V1n
l1, work as I
l1_ref-I
l1<-0.1, makes lower brachium pontis IGBT conducting, works as I
l1_ref-I
l1> 0.1, makes brachium pontis IGBT conducting, as-0.1≤I
l1_ref-I
l1≤ 0.1, control signal is 0, upper and lower bridge arm IGBT not conductings.The control method of assembly M3 offset current is identical therewith.
Here 0.1A is the ordinary circumstance for assembly, and assembly maximum power electric current is generally about 5A, and adopt 0.1A, control precision is probably 2%, can satisfy condition.
2) photovoltaic branch voltage controls.When photovoltaic array is under local shades condition, if the maximum power voltage of photovoltaic module M1, M2, M3 is respectively U
m1, U
m2, U
m3, the maximum power voltage of photovoltaic module M4, M5, M6 is respectively U
m4, U
m5, U
m6, under two branch roads are in different light situation, unequal by connect two branch voltages being formed of assembly, i.e. U
m1+ U
m2+ U
m3≠ U
m4+ U
m5+ U
m6, so need to compensate branch voltage, maintain the stable of branch voltage, adopt the method that the voltage of branch road series capacitance is controlled here.The maximum power voltage of two photovoltaic branch roads is respectively: U
pvml=U
m1+ U
m2+ U
m3, U
pvm2=U
m4+ U
m5+ U
m6, obtain branch road maximum power voltage U by comparing
pvm=max{U
pvm1, U
pvm2, so U is respectively to the bucking voltage size of first and second branch road
pv1_ref=U
pvm-U
pvm1, U
pv2_ref=U
pvm-U
pvm2.
Fig. 4 is branch road bucking voltage control block diagram, is described with the voltage compensation of Article 1 branch road, the capacitance voltage U of detection branch
ps1, with bucking voltage U
pv1_refrelatively, after pi regulator, compare with triangular wave, triangular wave frequency is 10kHz, obtains the control signal G of switching tube V3, V3n
c1, comparison value is greater than triangular wave then makes lower brachium pontis IGBT conducting, is less than triangular wave and then makes brachium pontis IGBT conducting.The control method of Article 2 branch road bucking voltage is identical therewith.
The optimum configurations of pi regulator is: P
ps=0.2, I
ps=100.
Fig. 5 is parallel network reverse control block diagram.By DC side voltage of converter U
dCwith setting voltage U
dC_refrelatively, its error is controlled by the second pi regulator, and result is multiplied by the sinusoidal signal synchronous with line voltage, as inverter output current command signal I
inf, detect inverter output current I
in, with I
infrelatively, error controls through the 3rd pi regulator, then compares with triangular wave, obtains the control signal G of inverter
vSI, the break-make of control inverter switching device, as A phase, works as G
vSI> 0, brachium pontis IGBT conducting in control, lower brachium pontis IGBT turns off; Work as G
vSI< 0, in control, brachium pontis IGBT turns off, lower brachium pontis IGBT conducting.B, C phase control class signal seemingly.Triangular wave frequency is 10kHz.
The optimum configurations of the second pi regulator is: P
dc=0.2, I
dc=25; The optimum configurations of the 3rd pi regulator is P
in=0.5, I
in=300.
Fig. 6 is simulation comparison figure, and figure (a) is the photovoltaic array output power curve under conventional structure, and figure (b) is the photovoltaic array output power curve under the inventive method.Under identical local shades condition, for conventional array structures, adopt the maximum power tracking method of local or the overall situation, its power output is approximately 715W, adopts photovoltaic array structure of the present invention, controlling brancher voltage, make every bar branch road all reach maximum power, power output is 810W, and power improves 11.7%, add the delivery efficiency of photovoltaic array, to the operation of photovoltaic array, there is practical significance.
In photovoltaic array, the electric pressure of IGBT is 1200V.
Claims (6)
1. the photovoltaic array control method based on photovoltaic array topological structure, it is characterized in that, described photovoltaic array topological structure is: photovoltaic array comprises many photovoltaic branch roads in parallel, each photovoltaic branch road comprises assembly branch road and compensates branch road, assembly props up route blocking diode, N number of photovoltaic module and an electric capacity and is in series successively, and compensating circuit comprises N number of inductance and N number of IGBT brachium pontis; All IGBT brachium pontis all with assembly branch circuit parallel connection; Each IGBT brachium pontis is made up of two IGBT; N number of mid point that N number of IGBT brachium pontis is corresponding is connected to N number of negative pole end points place of N number of photovoltaic module respectively by N number of inductance; N be more than or equal to 2 integer;
Comprise (1) current compensation process and (2) voltage compensation procedure;
(1) current compensation process is:
Current compensation refers to adopt the IGBT brachium pontis described in N-1 to carry out current compensation;
To each the IGBT brachium pontis in N-1 IGBT brachium pontis before each photovoltaic branch road, all implement following control:
Obtain inductance L
ielectric current I
li, with offset current I
li_refrelatively, then by stagnant chain rate comparatively, the control signal G of the switching tube (Vi, Vin) on i-th IGBT brachium pontis is obtained
li, namely work as I
li_ref-I
li<-0.1, makes the conducting of lower brachium pontis IGBT (Vin), works as I
li_ref-I
li>0.1, makes brachium pontis IGBT (Vi) conducting, as-0.1<I
li_ref-I
li<0.1, control signal is 0, upper and lower bridge arm IGBT not conductings;
Wherein, offset current I
li_refi.e. i-th inductance L
ion the size of current that should inject, and I
li_ref=I
mi-I
m (i+1), I
miit is the maximum power electric current of i-th photovoltaic module;
(2) voltage compensation procedure:
Voltage compensation refers to and carries out voltage compensation based on N number of IGBT brachium pontis to the electric capacity in photovoltaic branch road;
The bucking voltage size of jth bar photovoltaic branch road is U
pvj_ref=U
pvm-U
pvmj, j=1,2 ..., M, M are the total number of photovoltaic branch road;
Wherein branch road maximum power voltage U
pvm=max{U
pvmj, wherein
u
mirefer to the maximum power voltage of jth bar photovoltaic branch road i-th photovoltaic module;
Control procedure is: for each photovoltaic branch road, be all implemented as follows control:
The capacitance voltage U of detection branch
psj, with bucking voltage U
pvj_refrelatively, after the first pi regulator, compare with the first triangular wave, obtain the N number of IGBT brachium pontis (V of switching tube
n, V
nn) control signal G
c1, comparison value is greater than the first triangular wave then makes lower brachium pontis IGBT (V
nn) conducting, be less than the first triangular wave and then make brachium pontis IGBT (V
n) conducting.
2. photovoltaic array control method according to claim 1, is characterized in that, described N is 3.
3. photovoltaic array control method according to claim 1, is characterized in that, the proportionality coefficient P of the first pi regulator
ps=0.2, integral coefficient I
ps=100; First triangle wave frequency is 10kHz.
4. a control method for grid-connected system, is characterized in that, in described grid-connected system, photovoltaic array is connected with three phase network with LC output filter by DC/DC DC chopper circuit, inverter successively;
Described photovoltaic array topological structure is: photovoltaic array comprises many photovoltaic branch roads in parallel, each photovoltaic branch road comprises assembly branch road and compensates branch road, assembly props up route blocking diode, N number of photovoltaic module and an electric capacity and is in series successively, and compensating circuit comprises N number of inductance and N number of IGBT brachium pontis; All IGBT brachium pontis all with assembly branch circuit parallel connection; Each IGBT brachium pontis is made up of two IGBT; N number of mid point that N number of IGBT brachium pontis is corresponding is connected to N number of negative pole end points place of N number of photovoltaic module respectively by N number of inductance; N be more than or equal to 2 integer;
Described control method comprises (A) photovoltaic array control method and (B) parallel network reverse control method;
(A) photovoltaic array control method comprises current compensation process and voltage compensation procedure;
(1) current compensation process is:
Current compensation refers to adopt N-1 IGBT brachium pontis to carry out current compensation;
To each the IGBT brachium pontis in N-1 IGBT brachium pontis before each photovoltaic branch road, all implement following control:
Obtain inductance L
ielectric current I
li, with offset current I
li_refrelatively, then by stagnant chain rate comparatively, the control signal G of the switching tube (Vi, Vin) on i-th IGBT brachium pontis is obtained
li, namely work as I
li_ref-I
li<-0.1, makes the conducting of lower brachium pontis IGBT (Vin), works as I
li_ref-I
li>0.1, makes brachium pontis IGBT (Vi) conducting, as-0.1<I
li_ref-I
li<0.1, control signal is 0, upper and lower bridge arm IGBT not conductings;
Wherein, offset current I
li_refi.e. i-th inductance L
ion the size of current that should inject, I
li_ref=I
mi-I
m (i+1), I
miit is the maximum power electric current of i-th photovoltaic module;
(2) voltage compensation procedure:
Voltage compensation refers to and carries out voltage compensation based on N number of IGBT brachium pontis to the electric capacity in photovoltaic branch road;
The bucking voltage size of jth bar photovoltaic branch road is U
pvj_ref=U
pvm-U
pvmj, j=1,2 ..., M, M are the total number of photovoltaic branch road;
Wherein branch road maximum power voltage U
pvm=max{U
pvmj, wherein
u
mirefer to the maximum power voltage of jth bar photovoltaic branch road i-th photovoltaic module;
Control procedure is: for each photovoltaic branch road, be all implemented as follows control:
The capacitance voltage U of detection branch
psj, with bucking voltage U
pvj_refrelatively, after the first pi regulator, compare with the first triangular wave, obtain the N number of IGBT brachium pontis (V of switching tube
n, V
nn) control signal G
c1, comparison value is greater than the first triangular wave then makes lower brachium pontis IGBT (V
nn) conducting, be less than the first triangular wave and then make brachium pontis IGBT (V
n) conducting;
(B) be parallel network reverse control method:
A, B, C three-phase of inverter is controlled respectively:
By DC side voltage of converter U
dCwith setting voltage U
dC_refrelatively, relative error is controlled by the second pi regulator, and result is multiplied by the sinusoidal signal synchronous with corresponding phase line voltage, as inverter output current command signal I
inf, detect inverter output current I
in, with I
infrelatively, error controls through the 3rd pi regulator, then compares with the second triangular wave, obtains the control signal G of inverter
vSI, the break-make of control inverter switching device, works as G
vSI>0, control correspondence and go up brachium pontis IGBT conducting mutually, lower brachium pontis IGBT turns off; Work as G
vSI<0, in control, brachium pontis IGBT turns off, lower brachium pontis IGBT conducting.
5. control method according to claim 4, is characterized in that, described N is 3; Described inverter is the inverter controlled based on voltage, current double closed-loop.
6. control method according to claim 5, is characterized in that, the proportionality coefficient P of the second pi regulator
dc=0.2, integral coefficient I
dc=25; The proportionality coefficient P of the 3rd pi regulator
in=0.5, integral coefficient I
in=300; Second triangle wave frequency is 10kHz.
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