CN103311954B - A kind of solar cell system - Google Patents
A kind of solar cell system Download PDFInfo
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- CN103311954B CN103311954B CN201310222748.1A CN201310222748A CN103311954B CN 103311954 B CN103311954 B CN 103311954B CN 201310222748 A CN201310222748 A CN 201310222748A CN 103311954 B CN103311954 B CN 103311954B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a kind of solar cell system, the one or more solar modules be connected successively, one or more inverter based on dynamic duty cycle compensation device, communication module or device, supervisory control system, and power consumption shows and prompting module.Solar cell system of the present invention, can overcome that effective duty cycle in prior art is easily lost, the defect such as self-compensation situation poor stability and the control effects difference to feedback quantity, not easily lose to realize effective duty cycle, compensate good stability and the advantage good to the control effects of feedback quantity.
Description
Technical field
The present invention relates to solar grid-connected electricity generation system, particularly, relate to solar cell system.
Background technology
In in recent years, based on the renewable energy system of wind energy and solar energy, more and more applied at world wide.For solar grid-connected electricity generation system, except the centralized big-power solar power station accounting for main flow at present, distributed solar energy grid-connected system, because it can optimize the operating state of solar panel, the annual energy output of system can be improved as a rule, day by day paid attention at present and become a study hotspot.
Wherein, based on the distributed generation system of inverter, particularly noticeable, and be used widely in the U.S..The core of inverter is high efficiency booster circuit, inverter circuit and control technology thereof, and booster circuit mainly comprises anti exciting converter and derivative circuit thereof.Active-clamp circuit of reversed excitation, because the no-voltage that can realize transformer primary side switching tube opens the zero-current switching with secondary side diode, is used widely in a lot of middle low power conversion occasion.The common feature of such circuit has two, and one is the personal safety in order to plant maintenance workman, comprises the transformer for isolating former secondary in main circuit; Two be the output of this kind equipment is all alternating current, in order to obtain higher output current quality, adopts Sine Wave Pulse Width Modulation (SPWM) modulation.
As everyone knows, the leakage inductance of transformer or the extra resonant inductance introduced, can change the rate of change of primary current, still also, this inductance also can cause the effective duty cycle in circuit working to lose simultaneously.In common DC/DC application scenario, this duty-cycle loss can not bring the problem in control: the DC/DC converter duty ratio that it needs when steady operation is generally a fixed value converter only needs a fixing duty ratio when steady operation; As long as steady-state working condition is constant, duty ratio can not change, and duty-cycle loss value is also fixing.Therefore like this, its PI compensator can be easy to automatically to regulate and to export, and the basis of steady operation duty ratio compensates the loss of duty ratio.A larger duty ratio, compensates duty-cycle loss.But but, then different for employing Sine Wave Pulse Width Modulation, because steady operation duty ratio can change along with the time, the duty ratio of then losing also can change along with the time, now by means of only PI compensator, (SPWM) active-clamp circuit of reversed excitation (and derivative circuit), duty-cycle loss can produce the trouble in FEEDBACK CONTROL.This is mainly due under SPWM modulation, and duty ratio becomes nonlinear change, and the duty ratio of loss is also non-linear.For common PI or PID compensator, the loss of the duty ratio that the dynamic compensation that it cannot be real-time is very well lost, thus the effect of the control to feedback quantity can be affected.This is a new problem, because this quasi-converter is generally used for DC/DC in the past, instead of does SPWM modulation.
For the DC/AC converter of this type of isolated form, normally by improving PI compensator bandwidth as far as possible, or reduce leakage inductance, and then do not use the ways such as resonant inductance to reduce duty-cycle loss.Thus improve the effect of SPWM control, the electric current of outputting high quality.Then because the restriction PI compensator bandwidth of switching frequency cannot be accomplished enough high, lead-in inductance and transformer leakage inductance exist all the time, and little leakage inductance or do not use resonant inductance can increase the change of current speed of primary current, increase circuit high frequency switch noise.
In prior art, usually can use the problem that the method for design is introduced to avoid duty-cycle loss.Such as, in order to avoid duty-cycle loss, the operating frequency of main circuit can be improved, the bandwidth of PI compensator can be improved like this, allow PI compensator can the duty ratio of compensating missing faster, but high operating frequency, what bring is high switching loss, reduces the efficiency of converter.And for example, larger static exciter inductance can be designed, reduce the ratio of leakage inductance and magnetizing inductance, thus reduce leakage inductance and the duty-cycle loss value caused by lead-in inductance, and this method is used widely in the occasion little for converter volume requirement, and some are for the higher occasion of inverter power density requirements, large magnetizing inductance method for designing is restricted.
Fig. 1 a and Fig. 1 b is the isolated form DC/DC converter of a quasi-representative, and it comprises high end clamp inverse-excitation converting circuit (as shown in Figure 1a) and low end clamp inverse-excitation converting circuit (as shown in Figure 1 b).Wherein, two switching tubes
with
complementary duty,
for transformer leakage inductance or the resonant inductance that additionally adds,
for the magnetizing inductance of transformer primary side,
for clamping capacitance,
for rectifier diode,
for direct current output loading.In the high end clamp anti exciting converter of SPWM modulation, its duty ratio exported
, effective duty cycle
and the duty ratio of loss
as shown in Figure 4.Can find out, owing to have employed SPWM modulation, each duty ratio in circuit is not steady state value, and their waveform is non-linear.If only itself carry out the duty ratio of compensating missing by PI or PID compensator, good effect can not be reached, thus the Control platform to final controlled quentity controlled variable can be affected.Therefore, need in controlling unit, add Dynamic Duty Cycle compensation tache.For high end clamp circuit of reversed excitation, the primary current key waveforms of its circuit as shown in Figure 2.
Represent in Fig. 2
be the time of duty-cycle loss, during this period of time, transformer bears load voltage, although there is switching signal initiatively to open main switch
but, and for carry out energy storage to magnetizing inductance, but voltage input voltage and load being converted former limit has all been added in leakage inductance or the extra resonant inductance introduced
on, now
electric current rise fast until be equal to exciting current
, afterwards just from newly to magnetizing inductance energy storage.Necessarily there is leakage inductance in transformer, then duty-cycle loss phenomenon is inevitable in the converter of this type of isolated form.
The primary current waveform of high end clamp circuit of reversed excitation can represent with sectional linear wave, in the t0 moment,
it is open-minded,
turn off, simple equivalent circuit at this moment as shown in Figure 3.
When the converter of this type of isolated form works in DC/DC pattern, although there is duty-cycle loss, but owing to only having a steady operation point (both an output duty cycle), as long as PI compensator is by output voltage and the error that is fixed between point voltage, just after some cycles, this duty-cycle loss can be compensated and go back, make up the output voltage distortion that duty-cycle loss causes, as long as at the beginning of circuit design, consider that the superposition of duty-cycle loss and maximum duty cycle is not more than maximum duty cycle restriction and just can maintains output voltage.
And when the converter work of this type of isolated form and SPWM modulate, PI compensator is only used to compensate duty-cycle loss, limited efficiency, this chief reason is because when SPWM modulates, the operative duty cycles of this converter changes, so its steady operation point also changes in the change along with output voltage always along with the change of output voltage.PI compensator is according to SPWM modulation principle, and each switch periods can calculate a duty ratio, and only gives main switch by this duty ratio
, due to
existence, the duty ratio that the effective duty cycle of actual storage energy calculates than PI is little,
little also just than the desirable effective duty cycle provided of energy stored, output voltage does not reach requirement, next switch periods, PI or PID compensator finds that the error of output voltage and reference voltage becomes large, it increases its duty ratio exported by continuing, desirable to provide more multi-energy to load, with boosted output voltages, not a fixing voltage owing to exporting, output voltage own also changes, PI or PID compensator cannot find duty-cycle loss by means of only the error of output voltage and given voltage, therefore cannot compensate.
As above introduce, this quasi-converter is worked in SPWM modulation, its duty ratio exported
, effective duty cycle
and the duty ratio of loss
as shown in Figure 4.Can find out, owing to have employed SPWM modulation, each duty ratio in circuit is not steady state value, and their waveform changes in time.If only itself carry out the duty ratio of compensating missing by PI compensator, good effect can not be reached, thus the Control platform to final controlled quentity controlled variable can be affected.Therefore, need in controlling unit, add Dynamic Duty Cycle compensation tache.
Realizing in process of the present invention, inventor finding at least to exist in prior art that effective duty cycle is easily lost, the defect such as self-compensation situation poor stability and the control effects difference to feedback quantity.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of solar cell system, not easily lose to realize effective duty cycle, compensate good stability and the advantage good to the control effects of feedback quantity.
For achieving the above object, the technical solution used in the present invention is: a kind of solar cell system, at least comprise the one or more solar modules be connected successively, one or more inverter based on dynamic duty cycle compensation device, communication module or device, supervisory control system, and power consumption shows and prompting module.
Further, in described one or more solar module, each solar module comprise single crystal silicon battery plate, polycrystal silicon cell plate and utilize in the various hull cell plates of the generation electric energy of solar power generation one or more.
Further, described communication module or device, comprise power carrier PLC module, ZigBee module, WIFI module, and at least comprise one or more in the wireless communication networks of GPRS, 3G, 4G and bluetooth.
Further, described one or more based in the inverter of dynamic duty cycle compensation device, each inverter based on dynamic duty cycle compensation device at least comprises current controller, active-clamp circuit of reversed excitation and switching tube commutating circuit, wherein:
Described active-clamp circuit of reversed excitation, for the control based on current controller, carries out SPWM modulation treatment to output current, exports and the synchronous steamed bun current waveform of line voltage, this steamed bun current waveform
expression formula is in time
; Wherein
for the effective value of output current; ω is mains frequency;
Described switching tube commutating circuit, the steamed bun current waveform for exporting active-clamp circuit of reversed excitation carries out commutation process, and obtain the synchronous sine-wave current with line voltage, and input electrical network, the expression formula of this sinusoidal current waveform is
; Wherein
for exporting the effective value of grid-connected current; ω is mains frequency;
Described current controller, in the SPWM modulation treatment of active-clamp circuit of reversed excitation, according to the operating state of SPWM soft switch back exciting converter, at each computing cycle, calculates in next switch periods the loss duty ratio needing to compensate
; Again the loss duty ratio D calculated, the effective duty cycle be added in the SPWM modulation treatment of active-clamp circuit of reversed excitation
, to this effective duty cycle
carry out precompensation process.
Further, described supervisory control system, comprises the software service platform based on cloud computing, mobile phone operating system and various server; Described software service platform, is used for collecting the data by transmitting based on the inverter of dynamic duty cycle compensation device, and at least comprises monitoring, analysis, warning based on collection the data obtained and regulate the remote control operation of electricity process.
The solar cell system of various embodiments of the present invention, due to
before directly passing out to SPWM generator, add Dynamic Duty Cycle compensator; This Dynamic Duty Cycle compensator, according to the operating state of SPWM soft switch back exciting converter, calculates the loss duty ratio of next switch periods at each computing cycle
, then
be added to
on, be equivalent to carry out precompensation; May be used for this quasi-converter (active-clamp flyback soft switch transducer and derivative or similar soft switch back exciting converter thereof) and, when SPWM modulates, need the occasion of regulation output electric current, to optimize the quality of SPWM modulation this quasi-converter output current lower; Thus can overcome that effective duty cycle in prior art is easily lost, self-compensation situation poor stability and the defect to the control effects difference of feedback quantity, not easily lose to realize effective duty cycle, compensate good stability and the advantage good to the control effects of feedback quantity.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in write specification, claims and accompanying drawing and obtain.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 a is typical active-clamp circuit of reversed excitation low and middle-end clamp circuit of reversed excitation schematic diagram;
Fig. 1 b is typical active-clamp circuit of reversed excitation middle and high end clamp circuit of reversed excitation schematic diagram;
Fig. 2 is the primary current key waveforms schematic diagram of high end clamp anti exciting converter;
Fig. 3 be high end clamp anti exciting converter during t0 ~ t1 in schematic equivalent circuit;
Fig. 4 is the duty ratio waveform schematic diagram of the high end clamp circuit of reversed excitation of SPWM modulation;
Fig. 5 a is for the structural representation of the inverter based on dynamic duty cycle compensation device of low end clamp anti exciting converter;
Fig. 5 b is for the structural representation of the inverter based on dynamic duty cycle compensation device of high end clamp anti exciting converter;
Fig. 6 is the internal frame diagram with the current controller of Dynamic Duty Cycle compensator in Fig. 5 a and Fig. 5 b.
By reference to the accompanying drawings, in the embodiment of the present invention, Reference numeral is as follows:
1-feed-forward module; 2-PI or PID compensator; 3-Dynamic Duty Cycle compensator; 4-SPWM generator; 5-MPPT controller; 6-phase-locked loop; 7-multiplier.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
According to the embodiment of the present invention, provide a kind of solar cell system.
In the present embodiment, based on the solar cell system of dynamic duty cycle compensation device, at least comprise the one or more solar modules be connected successively, one or more inverter based on dynamic duty cycle compensation device, communication module or device, supervisory control system, and power consumption shows and prompting module.
In the above-described embodiments, in one or more solar module, each solar module comprise single crystal silicon battery plate, polycrystal silicon cell plate and utilize in the various hull cell plates of the generation electric energy of solar power generation one or more.
In the above-described embodiments, communication module or device, comprise power carrier PLC module, ZigBee module, WIFI module, and at least comprise one or more in the wireless communication networks of GPRS, 3G, 4G and bluetooth.
In the above-described embodiments, one or more based in the inverter of dynamic duty cycle compensation device, the structure of each inverter based on dynamic duty cycle compensation device and performance, see the related description of above inverter embodiment, can not repeat them here.
In the above-described embodiments, supervisory control system, comprises the software service platform based on cloud computing, mobile phone operating system and various server; Software service platform, is used for collecting the data by transmitting based on the inverter of dynamic duty cycle compensation device, and at least comprises monitoring, analysis, warning based on collection the data obtained and regulate the remote control operation of electricity process.
In the above-described embodiments, based on the inverter that Dynamic Duty Cycle compensates, as shown in Fig. 5 a, Fig. 5 b and Fig. 6, provide.Shown in Fig. 5 b, micro-inverter is for high end clamp circuit of reversed excitation.Similar, high end clamp circuit of reversed excitation in Fig. 5 b (a) is replaced with low end clamp circuit of reversed excitation (see Fig. 1 b) see Fig. 1, namely the another kind of inverter (see micro-inverter shown in Fig. 5 a, Fig. 5 a for low end clamp circuit of reversed excitation) compensated based on Dynamic Duty Cycle can be obtained.
As shown in figure 5 a and 5b, the present embodiment at least comprises current controller, active-clamp circuit of reversed excitation, switching tube commutating circuit and solar maximum power point and follows the tracks of MPPT controller, this current controller is with Dynamic Duty Cycle compensator, and this switching tube commutating circuit comprises thyristor (SCR) and MOS (metal-oxide-semiconductor) memory (MOSFET).Fig. 5 a and Fig. 5 b gives two kinds of typical embodiments.
Wherein, above-mentioned active-clamp circuit of reversed excitation, for the control based on current controller, and carries out SPWM modulation treatment to output current, exports and the synchronous steamed bun current waveform of line voltage; This steamed bun current waveform
expression formula is in time
; Wherein
for the effective value of output current; ω is mains frequency.SCR and MOSFET commutating circuit, the steamed bun current waveform for exporting active-clamp circuit of reversed excitation carries out commutation process, and obtain the synchronous sine-wave current with line voltage, and input electrical network, the expression formula of this sinusoidal current waveform is
; Wherein
for exporting the effective value of grid-connected current; ω is mains frequency.Current controller, in the SPWM modulation treatment of active-clamp circuit of reversed excitation, according to the operating state of SPWM soft switch back exciting converter, at each computing cycle, calculates in next switch periods the loss duty ratio needing to compensate
; Again the loss duty ratio calculated
, the effective duty cycle be added in the SPWM modulation treatment of active-clamp circuit of reversed excitation
, to this effective duty cycle
carry out precompensation process.Solar maximum power point follows the tracks of MPPT controller, for in the SPWM modulation treatment of active-clamp circuit of reversed excitation, the situation of change of the extraneous factors such as the light intensity that tracking solar battery receives and environment, the output of adjustment active-clamp circuit of reversed excitation, makes solar cell operate in maximum power point.
In the above-described embodiments, as shown in Figure 6, current controller comprises MPPT controller (MPPT Controller) 5, phase-locked loop (Phase Locked Loop is called for short PLL) 6, multiplier 7, feed-forward module 1, PI or PID compensator 2, Dynamic Duty Cycle compensator 3 and SPWM generator 4.
Here, full name " MPPT maximum power point tracking " (Maximum Power Point Tracking the is called for short MPPT) controller for solar of MPPT controller 5 is requisite control assemblys in high-efficiency solar electricity generation system.So-called MPPT maximum power point tracking, namely refer to that controller can the output voltage of detecting real-time solar panels and electric current, calculating instantaneous output (V*I), by constantly regulating the operating state of solar converter, making solar panel stable output power in maximum.Thus solar power system can to the maximum power of electrical grid transmission.Because the extraneous factor such as power output and the light intensity that receives and ambient temperature of solar cell is closely related, its power output is change.Time under low temperature and high light conditions, power output is larger; Vice versa.Therefore, the inverter of band MPPT maximal power tracing is exactly to utilize solar cell the most fully, makes it to operate in maximum power point, to electrical network Maximum Power Output.When environment changes, solar cell power output changes, and inverter output power also can change, and during band individual loads, if inverter output power can not provide bearing power, that load can not normal electricity consumption.Phase-locked loop 6 also known as phase-locked loop, be used for for the output current of inverter provide one accurately time base phase signal, make final purpose be make output current and voltage in phase, power factor is 1.
Wherein, above-mentioned MPPT controller 5, the solar panel output voltage utilizing sample circuit to obtain
with solar panel output current
, carry out maximal power tracing control, produce a reference voltage and be used in subsequent control; PLL 6, utilizes the mains voltage signal that sample circuit obtains
, calculate amplitude and the phase place of line voltage, and generate a reference phase signal output, for subsequent control; Multiplier 7, for based on the output signal from MPPT controller and the phase reference signal from PLL, carries out the process that is multiplied, obtains output reference current
; Feed-forward module 1, for based on SPWM modulation in input terminal voltage
with output end voltage
, carry out the process of removal coupling amount, export and remove coupling amount signal; PI or PID compensator 2, for based on SPWM modulation in output end current
, output reference current
, and feed-forward module 1 export removal coupling amount signal, carry out pre compensation process, export effective duty cycle
; Dynamic Duty Cycle compensator 3, for based on SPWM modulation in input terminal voltage
, output end voltage
with output end current
, according to the operating state of SPWM soft switch back exciting converter, at each computing cycle, calculate in next switch periods the loss duty ratio needing to compensate
; Again the loss duty ratio calculated
, the effective duty cycle that PI or the PID compensator 2 that is added to exports
, carry out precompensation process, export given duty ratio
; SPWM generator 4, for the given duty ratio exported based on Dynamic Duty Cycle compensator
, carry out SPWM adjustment, export for semiconductor switch in control SPWM soft switch back exciting converter
with
control signal GS1 and GS2.
In the above-described embodiments, Fig. 8 be the inverter structure figure of the Active Clamp Flyback Converter with Dynamic Duty Cycle compensator, Fig. 5 a for low end clamp anti exciting converter, Fig. 5 b is for high end clamp anti exciting converter.The Active Clamp Flyback Converter shown in Fig. 5 a and Fig. 5 b, is modulated by SPWM, exports and the synchronous steamed bun current waveform of line voltage, this steamed bun current waveform
expression formula is in time
; Wherein
for the effective value of output current; ω is mains frequency.This steamed bun current waveform is by thyristor SCR & MOSFET commutating circuit below, and input and the synchronous sine-wave current of line voltage in electrical network, the expression formula of this sinusoidal current waveform is
; Wherein I
gridfor exporting the effective value of grid-connected current; ω is mains frequency.
Fig. 6 gives the internal structure block diagram of current controller in Fig. 5 a and Fig. 5 b, and MPPT controller 5 major function is MPPT maximum power point tracking, and the output of MPPT controller 5 and the output multiplication of phase-locked loop 6, obtain the reference quantity of output current; The sampled value of output current compares with this reference quantity, and difference is regulated by PI or PID compensator 2.Feed-forward module 1 in Fig. 6, the main coupling amount removed in SPWM modulation; Dynamic Duty Cycle compensator 3 is sent in the output of PI or PID compensator 2; This Dynamic Duty Cycle compensator 3, based on aforementioned theory deduction (see the related description of embodiment of the method, not repeating them here), calculates the loss duty ratio needing to compensate
, regulated by SPWM afterwards, export control signal GS1 and GS2.
Fig. 5 a and Fig. 5 b is that complete transformer configuration figure, Fig. 5 a and Fig. 5 b of above-described embodiment is for high end clamp anti exciting converter.Low end clamp anti exciting converter is similar.This Active Clamp Flyback Converter is modulated by SPWM, exports and the synchronous steamed bun current waveform of line voltage, by thyristor SCR & MOSFET commutating circuit below, and input and the synchronous sine-wave current of line voltage in electrical network.Fig. 6 gives the internal structure block diagram of current controller in Fig. 5 a and Fig. 5 b.MPPT controller major function is MPPT maximum power point tracking, and the output of this controller and the output multiplication of phase-locked loop, obtain the reference quantity of output current.The sampled value of output current compares with this reference quantity, and difference is regulated by PI.Feed-forward module in block diagram mainly removes the coupling amount in SPWM modulation.Dynamic Duty Cycle compensator is sent in the output of PI or PID compensator.This compensator, based on aforementioned theory deduction, calculates the loss duty ratio D needing to compensate.Regulated by SPWM afterwards, export controlled quentity controlled variable GS1 and GS2.
Above-described embodiment just based on SPWM modulation, and has the circuit of duty-cycle loss.Same embodiment also has single-stage isolated type pfc circuit, it is also modulate based on SPWM, simultaneously due to the existence of transformer, introduce leakage inductance and there is duty-cycle loss phenomenon, also can use said method, in each switch periods, according to the parameter of main circuit, calculate the duty ratio of losing, then at each control cycle, the loss duty ratio calculated is added on the effective duty cycle of main PI compensator output, thus optimize output current wave.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a solar cell system, is characterized in that, at least comprises the one or more solar modules be connected successively, one or more inverter based on dynamic duty cycle compensation device, communication module or device, supervisory control system, and power consumption shows and prompting module;
Described one or more based in the inverter of dynamic duty cycle compensation device, each inverter based on dynamic duty cycle compensation device at least comprises current controller, active-clamp circuit of reversed excitation and switching tube commutating circuit, wherein:
Described active-clamp circuit of reversed excitation, for the control based on current controller, carries out SPWM modulation treatment to output current, exports and the synchronous steamed bun current waveform of line voltage, this steamed bun current waveform
expression formula is in time
; Wherein I
ofor the effective value of output current; ω is mains frequency;
Described switching tube commutating circuit, the steamed bun current waveform for exporting active-clamp circuit of reversed excitation carries out commutation process, and obtain the synchronous sine-wave current with line voltage, and input electrical network, the expression formula of sinusoidal current waveform is
; Wherein I
gridfor exporting the effective value of grid-connected current; ω is mains frequency;
Described current controller, in the SPWM modulation treatment of active-clamp circuit of reversed excitation, according to the operating state of SPWM soft switch back exciting converter, at each computing cycle, calculates in next switch periods the loss duty ratio needing to compensate
; Again the loss duty ratio D calculated, the effective duty cycle be added in the SPWM modulation treatment of active-clamp circuit of reversed excitation
, to this effective duty cycle
carry out precompensation process.
2. solar cell system according to claim 1, it is characterized in that, in described one or more solar module, each solar module comprise single crystal silicon battery plate, polycrystal silicon cell plate and utilize in the various hull cell plates of the generation electric energy of solar power generation one or more.
3. solar cell system according to claim 1, is characterized in that, described communication module or device, comprise power carrier PLC module, ZigBee module, WIFI module, and one or more at least comprising in the wireless communication networks of GPRS, 3G, 4G and bluetooth.
4. solar cell system according to claim 1, is characterized in that, described supervisory control system, comprises the software service platform based on cloud computing, mobile phone operating system and various server; Described software service platform, is used for collecting the data by transmitting based on the inverter of dynamic duty cycle compensation device, and at least comprises monitoring, analysis, warning based on collection the data obtained and regulate the remote control operation of electricity process.
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| CN106160793B (en) * | 2015-04-16 | 2019-05-14 | 上海虑信电力科技有限公司 | The driving of solar panel inductive coupling carrier wave |
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| CN103311954A (en) | 2013-09-18 |
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