CN103116383B - Two-way boost photovoltaic inverter and control method thereof - Google Patents
Two-way boost photovoltaic inverter and control method thereof Download PDFInfo
- Publication number
- CN103116383B CN103116383B CN201210570597.4A CN201210570597A CN103116383B CN 103116383 B CN103116383 B CN 103116383B CN 201210570597 A CN201210570597 A CN 201210570597A CN 103116383 B CN103116383 B CN 103116383B
- Authority
- CN
- China
- Prior art keywords
- booster circuit
- voltage
- disturbance
- input voltage
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a two-way boost photovoltaic inverter and a two-way boost control method and a maximum power point tracing method thereof. According to the two-way boost control method, opening or closing of a first boosted circuit and a second boosted circuit are reasonably and effectively controlled according to comparative results of a first input voltage of the first boosted circuit and a second input voltage and a cut-in voltage of the second boosted circuit. According to the maximum power point tracing method, a disturbance voltage of the first boosted circuit and the second boosted circuit is determined according to the condition whether the first boosted circuit and the second boosted circuit are inserted into a photovoltaic panel and the opening or closing conduction of the first boosted circuit and the second boosted circuit to conduct the maximum power point tracing, and thus maximum-power adjustment and output of the two-way boost photovoltaic inverter are realized.
Description
Technical field
The application relates to field of photovoltaic power generation, is specifically related to a kind of two-way boost photovoltaic inverter and control method thereof.
Background technology
Present stage, most of photovoltaic DC-to-AC converter adopted single channel boost mode, but it is limited in roof area, photovoltaic panel is laid on diverse location, because light-receiving area is different with light reception intensity, its output power is also by difference, when adopting single channel boost mode, be then difficult to realize maximum power output, thus loss portion of energy.Therefore, photovoltaic DC-to-AC converter adopts two-way booster circuit, accesses the photovoltaic panel of different capacity respectively, can effectively solve the problem.But, in the photovoltaic DC-to-AC converter with two-way booster circuit, how conservative control is carried out to the unlatching of two-way booster circuit or closedown, to determine photovoltaic DC-to-AC converter works under which kind of state, become this area technical issues that need to address.In addition, in order to ensure that photovoltaic DC-to-AC converter exports maximum power, the mode of usual employing MPPT maximum power point tracking obtains maximum power point, but, the maximum power point tracing method that present stage adopts is by the output voltage of detecting photovoltaic panel, carry out disturbance using it as disturbance voltage to obtain maximum power point voltage, for the photovoltaic DC-to-AC converter with two-way booster circuit, the maximum power point tracing method of single channel boost mode is obviously inapplicable.In the photovoltaic DC-to-AC converter with two-way booster circuit, rational maximum power point tracing method how is adopted also to be this area technical issues that need to address to reach maximum power output.
Summary of the invention
This application provides a kind of two-way boost photovoltaic inverter and control method thereof, conservative control can be carried out to the unlatching of two-way booster circuit or closedown.
According to the first aspect of the application, this application provides a kind of control method of two-way boost photovoltaic inverter, comprise two-way boosting and open rate-determining steps, described two-way boosting is opened rate-determining steps and is comprised:
Detect the first input voltage being input to the first booster circuit and the second input voltage being input to the second booster circuit input respectively.
First input voltage, the second input voltage and cut-in voltage are compared, determine unlatching or the closedown of the first booster circuit, the second booster circuit, be specially, when being judged as that the first input voltage and the second input voltage are less than cut-in voltage simultaneously, control to open the first booster circuit and the second booster circuit simultaneously; Be judged as that the first input voltage is less than cut-in voltage and the second input voltage is greater than cut-in voltage time, control unlatching first booster circuit and close the second booster circuit; Be judged as that the first input voltage is greater than cut-in voltage and the second input voltage is less than cut-in voltage time, control closedown first booster circuit and open the second booster circuit; When being judged as that the first input voltage and the second input voltage are greater than cut-in voltage simultaneously, control to close the first booster circuit and the second booster circuit simultaneously.
According to the second aspect of the application, this application provides a kind of two-way boost photovoltaic inverter, comprising:
First booster circuit, its voltage input end is connected with first via photovoltaic panel, and described first booster circuit exports after being boosted by the first input voltage.
Second booster circuit, its voltage input end is connected with the second road photovoltaic panel, described second booster circuit exports after being boosted by the second input voltage, and described second booster circuit and the first booster circuit are connected in parallel, and exports busbar voltage by the bus end after parallel connection.
Voltage conversion circuit, it is connected, for converting described busbar voltage to alternating voltage with the bus end after the first booster circuit and the second booster circuit parallel connection respectively.
Control circuit, it is connected with the first booster circuit and the second booster circuit respectively, for obtaining the first input voltage and the second input voltage from the voltage input end of the first booster circuit and the second booster circuit respectively, and itself and cut-in voltage are compared, unlatching or the closedown of the first booster circuit and the second booster circuit is controlled according to comparative result, be specially, when control circuit is judged as that the first input voltage and the second input voltage are all less than cut-in voltage, control unlatching first booster circuit and the second booster circuit; Control circuit be judged as that the first input voltage is less than and the second input voltage is greater than cut-in voltage time, control unlatching first booster circuit and close the second booster circuit; Control circuit be judged as that the first input voltage is greater than and the second input voltage is less than cut-in voltage time, control closedown first booster circuit and open the second booster circuit; When control circuit is judged as that the first input voltage and the second input voltage are all greater than cut-in voltage, control closedown first booster circuit and the second booster circuit.
In the two-way boost photovoltaic inverter that the application provides and control method thereof, according to the comparative result of the first input voltage of the first booster circuit and the second input voltage of the second booster circuit and cut-in voltage, control unlatching or the closedown of the first booster circuit and the second booster circuit rationally and effectively.
Accompanying drawing explanation
Fig. 1 is the structural drawing of two-way boost photovoltaic inverter in a kind of embodiment of the application;
Fig. 2 is the control method process flow diagram of two-way boost photovoltaic inverter in a kind of embodiment of the application;
Fig. 3 is the process flow diagram of disturbance voltage determining step in two-way boost photovoltaic inverter maximum power point tracing method in a kind of embodiment of the application;
Fig. 4 is the process flow diagram of the quick tracking step of maximum power point in two-way boost photovoltaic inverter maximum power point tracing method in a kind of embodiment of the application.
Embodiment
By reference to the accompanying drawings the application is described in further detail below by embodiment.
MPPT maximum power point tracking (MPPT, Maximum Power Point Tracking) refer to the generating voltage of MPPT maximum power point tracking circuit detecting real-time photovoltaic panel, and follow the trail of ceiling voltage current value (VI), it is applied in solar energy photovoltaic system, for coordinating the work of solar panel, accumulator, load, make photovoltaic DC-to-AC converter Maximum Power Output.
MPPT maximum power point tracking cannot be reached when accessing the photovoltaic panel of different capacity based on current single channel boost photovoltaic inverter, and then affect the problem of photovoltaic DC-to-AC converter work efficiency, in the embodiment of the present application, two-way boost photovoltaic inverter can be accessed by the panel of two-way different capacity.Photovoltaic DC-to-AC converter in the course of the work, the voltage that the voltage export first via photovoltaic panel and the second road photovoltaic panel export and cut-in voltage compare, unlatching to the first booster circuit and the second booster circuit or closedown is determined, to realize the control to two-way booster circuit according to comparative result.Meanwhile, the two-way boost photovoltaic inverter provided in the embodiment of the present application can carry out MPPT maximum power point tracking to single channel, makes photovoltaic DC-to-AC converter play maximum work efficiency.
Embodiment one:
Please refer to Fig. 1, present embodiments provide a kind of two-way boost photovoltaic inverter, comprise the first booster circuit 101, second booster circuit 102, change-over circuit 103, control circuit 104 and MPPT maximum power point tracking circuit 105.
The voltage input end of the first booster circuit 101 is connected with first via photovoltaic panel, and for being boosted by the first input voltage, the first input voltage is the voltage that first via photovoltaic panel outputs to the first booster circuit 101.The voltage input end of the second booster circuit 102 is connected with the second road photovoltaic panel, and for being boosted by the second input voltage, the second input voltage is the voltage that the second road photovoltaic panel outputs to the second booster circuit 102.First booster circuit 101 and the second booster circuit 102 are connected in parallel, and export busbar voltage by the bus end after parallel connection.Change-over circuit 103 is connected with the first booster circuit 101 and the second booster circuit 102 respectively, for converting the busbar voltage of direct current to alternating voltage, and exports.Control circuit 104 is connected with the first booster circuit 101 and the second booster circuit 102 respectively, for obtaining the first input voltage and the second input voltage from the voltage input end of the first booster circuit and the second booster circuit respectively, and itself and cut-in voltage are compared, unlatching or the closedown of the first booster circuit 101 and the second booster circuit 102 is controlled according to comparative result.Be specially: when control circuit 104 is judged as that the first input voltage and the second input voltage are all less than cut-in voltage, control unlatching first booster circuit 101 and the second booster circuit 102; Control circuit 104 be judged as that the first input voltage is less than and the second input voltage is greater than cut-in voltage time, control unlatching first booster circuit 101 and close the second booster circuit 102; Control circuit 104 be judged as that the first input voltage is greater than and the second input voltage is less than cut-in voltage time, control closedown first booster circuit 101 and open the second booster circuit 102; When control circuit 104 is judged as that the first input voltage and the second input voltage are all greater than cut-in voltage, control closedown first booster circuit 101 and the second booster circuit 102.Cut-in voltage pre-sets according to the actual demand of photovoltaic generating system.
Control circuit 104 is also connected with the bus end after the first booster circuit 101 and the second booster circuit 102 parallel connection, for regulating busbar voltage, be specially: the first input voltage and the second input voltage and bus normal voltage compare by control circuit 104, by varying DC link voltage to the maximum voltage of three.Bus normal voltage calculates according to the grid condition of different regions, and it is the numerical value pre-set.Such as, in the AC network of 230V, first try to achieve the effective value of AC network, this effective value is multiplied by 110% value obtained as bus normal voltage, i.e. 230*1.414*110%=357.74, can round numbers 360V as the bus normal voltage of photovoltaic DC-to-AC converter in this area's photovoltaic generating system.
But, because fluctuation often appears in the crest voltage in electrical network, in order to busbar voltage is greater than this crest voltage when ensureing that fluctuation occurs line voltage peak value, prevent that line voltage is counter fills with back in photovoltaic DC-to-AC converter.In another embodiment, control circuit 104 is for regulating busbar voltage, be specially: the first input voltage and the second input voltage and bus normal voltage compare by control circuit 104, and varying DC link voltage is added the value after predeterminated voltage to the voltage that three is maximum.This predeterminated voltage pre-sets according to actual electric network situation, and in an instantiation, predeterminated voltage is set to 10V.
MPPT maximum power point tracking circuit 105 is connected with the first booster circuit 101 and the second booster circuit 102 respectively, and for detecting the access state of the first booster circuit 101 and the second booster circuit 102 and photovoltaic panel, its testing result can have three kinds of modes below.
Mode one: MPPT maximum power point tracking circuit 105 detects that the first booster circuit 101 and the second booster circuit 102 are linked into photovoltaic panel simultaneously.
Mode two: MPPT maximum power point tracking circuit 105 detects that the first booster circuit 101 is linked into photovoltaic panel, and the second booster circuit 102 does not access photovoltaic panel.
Mode three: MPPT maximum power point tracking circuit 105 detects that the second booster circuit 102 is linked into photovoltaic panel, and the first booster circuit 101 does not access photovoltaic panel.
When the testing result of MPPT maximum power point tracking circuit 105 is mode a period of time, then MPPT maximum power point tracking circuit 105 continues unlatching or the closedown situation of detection first booster circuit 101 and the second booster circuit 102, and according to opening or close the disturbance voltage of situation determination maximal power tracing, be specially, detect that the first booster circuit 101 and the second booster circuit 102 are all opened, then the maximal power tracing of the first booster circuit 101 and the second booster circuit 102 is all disturbance voltage with busbar voltage; Detect that the first booster circuit 101 is opened and the second booster circuit 102 cuts out, then the maximal power tracing of the first booster circuit 101 and the second booster circuit 102 respectively with busbar voltage and the second input voltage for disturbance voltage; Detect that the first booster circuit 101 cuts out and the second booster circuit 102 is opened, then the maximal power tracing of the first booster circuit 101 and the second booster circuit 102 respectively with the first input voltage and busbar voltage for disturbance voltage; Detect that the first booster circuit 101 and the second booster circuit 102 are all closed, then the maximal power tracing of the first booster circuit 101 and the second booster circuit 102 respectively with the first input voltage and the second input voltage for disturbance voltage.
When the testing result of MPPT maximum power point tracking circuit 105 is mode two, then MPPT maximum power point tracking circuit 105 continues unlatching or the closedown situation of detection first booster circuit 101, and according to opening or close the disturbance voltage of situation determination maximal power tracing, be specially, detect that the first booster circuit 101 is opened, then the maximal power tracing of the first booster circuit 101 take busbar voltage as disturbance voltage; Detect that the first booster circuit 101 cuts out, then the maximal power tracing of the first booster circuit 101 with the first input voltage for disturbance voltage.
When the testing result of MPPT maximum power point tracking circuit 105 is mode three, then MPPT maximum power point tracking circuit 105 continues unlatching or the closedown situation of detection second booster circuit 102, and according to opening or close the disturbance voltage of situation determination maximal power tracing, be specially, detect that the second booster circuit 102 is opened, then the maximal power tracing of the second booster circuit 102 take busbar voltage as disturbance voltage; Detect that the second booster circuit 102 cuts out, then the maximal power tracing of the second booster circuit 102 with the second input voltage for disturbance voltage.
After determining the disturbance voltage of MPPT maximum power point tracking, MPPT maximum power point tracking circuit 105 also judges whether to there is the signal opened maximum power point and follow the tracks of fast, if, 105, MPPT maximum power point tracking circuit with period 1 be the disturbance cycle by disturbance voltage disturbance to the first predeterminated voltage, be the disturbance cycle carry out disturbance afterwards with second round; If not, 105, MPPT maximum power point tracking circuit with normal second round for the disturbance cycle carries out disturbance to disturbance voltage.Period 1 is less than second round, and the first predeterminated voltage pre-sets, and in an instantiation, the first predeterminated voltage is the magnitude of voltage of photovoltaic panel open-circuit voltage 80%.The signal that unlatching maximum power point is followed the tracks of fast can pre-set, when user needs unlatching maximum power point to follow the tracks of fast, by being arranged so that MPPT maximum power point tracking circuit 105 can detect this signal.Due to the too small meeting of disturbance cycle have the greatest impact power points follow the tracks of accuracy, therefore, in the present embodiment, after reaching the first predeterminated voltage, the disturbance cycle is returned to normal second round.
The two-way boost photovoltaic inverter that the present embodiment provides can control unlatching or the closedown of the first booster circuit and the second booster circuit respectively rationally and effectively according to the first input voltage of the first booster circuit and the second input voltage of the second booster circuit, the value that also regulating and controlling busbar voltage is extremely suitable simultaneously.In addition, MPPT maximum power point tracking can also be carried out respectively to two-way booster circuit, simultaneously select different disturbance voltage according to the access state of two-way booster circuit and photovoltaic panel and On/Off situation thereof, make the tracking of maximum power point more accurate, to realize the maximum power output of photovoltaic DC-to-AC converter.Also judge whether during MPPT maximum power point tracking that opening maximum power point follows the tracks of fast, if opened, then first with the less period 1 for the disturbance cycle carries out disturbance, after reaching the first predeterminated voltage fast, again with normal second round for the disturbance cycle carries out disturbance to obtain maximum power point, substantially increase the speed of MPPT maximum power point tracking, improve the work efficiency of two-way boost photovoltaic inverter.
Embodiment two:
Please refer to Fig. 2, the process flow diagram of the control method of a kind of two-way boost photovoltaic inverter provided for the present embodiment, wherein, Pv1 and Pv2 is respectively for being input to the first input voltage of the first booster circuit and being input to the second input voltage of the second booster circuit input, Bus Volt is busbar voltage, Bus VoltStandard is bus normal voltage, and Bost1, Bost2 are respectively the first booster circuit and the second booster circuit.
The two-way boost control method of a kind of photovoltaic DC-to-AC converter that the present embodiment provides, comprises two-way boosting and opens rate-determining steps, specifically comprise:
Step 201, detects respectively and obtains Pv1 and Pv2.
Step 202, compares Pv1, Pv2 and Bus VoltStandard, regulates Bus Volt, makes Bus Volt=MAX [Pv1, Pv2, Bus VoltStandard].Bus VoltStandard calculates according to the grid condition of different regions, and it is the numerical value pre-set.Such as, in the AC network of 230V, first try to achieve the effective value of AC network, this effective value is multiplied by 110% value obtained as Bus VoltStandard, i.e. 230*1.414*110%=357.74, can round numbers 360V as the Bus VoltStandard of photovoltaic DC-to-AC converter in this area's photovoltaic generating system.
But, because fluctuation often appears in the crest voltage in electrical network, in order to busbar voltage is greater than this crest voltage when ensureing that fluctuation occurs line voltage peak value, prevent that line voltage is counter fills with back in photovoltaic DC-to-AC converter.In another embodiment, after Pv1, Pv2 and Bus VoltStandard is compared, regulate Bus Volt, make Bus Volt=MAX [Pv1, Pv2, Bus VoltStandard]+predeterminated voltage.This predeterminated voltage pre-sets according to actual electric network situation, and in an instantiation, predeterminated voltage is set to 10V, i.e. Bus Volt=MAX [Pv1, Pv2, Bus VoltStandard]+10V.
Step 203, compares Pv1 and Pv2 and cut-in voltage, and to determine unlatching or the closedown of Boost1 and Boost2, cut-in voltage pre-sets according to the actual demand of photovoltaic generating system.
Step 204, to open Boost1 and Boost2 according to the comparative result in step 203 or closes.Comparative result in step 203 comprises four kinds of modes below.
Mode 1:Pv1 and Pv2 is less than cut-in voltage.
Mode 2:Pv1 is less than and Pv2 is greater than cut-in voltage.
Mode 3:Pv1 is greater than and Pv2 is less than cut-in voltage.
Mode 4:Pv1 and Pv2 is greater than cut-in voltage.
When being judged as in step 204 meeting mode 1, control to open Boost1 and Boost2; When being judged as meeting mode 2, control open Boost1 and close Boost2; When being judged as meeting mode 3, control close Boost1 and open Boost2; When being judged as meeting mode 4, control to close Boost1 and Boost2.
Please refer to Fig. 3, the two-way boost control method of a kind of photovoltaic DC-to-AC converter that the present embodiment provides, also comprises MPPT maximum power point tracking step, specifically comprises:
Step 401, detect the access state of Boost1 and Boost2 and photovoltaic panel, this testing result has three kinds of modes below.
Mode one: Boost1 and Boost2 are linked into photovoltaic panel.
Mode two: Boost1 is linked into photovoltaic panel, and Boost2 does not access photovoltaic panel.
Mode three: Boost2 is linked into photovoltaic panel, and Boost1 does not access photovoltaic panel.
When testing result is mode a period of time, forwards step 402 to, during for mode two, forward step 407 to, during for mode three, forward step 410 to.
Step 402, detect unlatching or the situation of closedown of Boost1 and Boost2, and according to opening or close the disturbance voltage of situation determination maximal power tracing, the unlatching of Boost1 and Boost2 or closedown situation comprises four kinds of modes below:
Mode 1:Boost1 and Boost2 opens.
Mode 2:Boost1 opens, and Boost2 closes.
Mode 3:Boost1 closes, and Boost2 opens.
Mode 4:Boost1 and Boost2 closes.
When the unlatching of Boost1 and Boost2 or closedown situation meet mode 1, forward step 403 to, when meeting mode 2, forward step 404 to, when meeting mode 3, forward step 405 to, when meeting mode 4, forward step 406 to.
Step 403, Boost1 and Boost2 with Bus Volt for disturbance voltage carries out MPPT maximum power point tracking.
Step 404, Boost1 is with Bus Volt and Boost2 take Pv2 as disturbance voltage carries out MPPT maximum power point tracking.
Step 405, Boost1 with Pv1 and Boost2 with Bus Volt for disturbance voltage carries out MPPT maximum power point tracking.
Step 406, Boost1 is with Pv1 and Boost2 take Pv2 as disturbance voltage carries out MPPT maximum power point tracking.
Step 407, detects unlatching or the situation of closedown of Boost1, when detecting that Boost1 opens, forwarding step 408 to, when detecting that Boost1 closes, forwarding step 409 to.
Step 408, Boost1 with Bus Volt for disturbance voltage carries out MPPT maximum power point tracking.
Step 409, Boost1 is that disturbance voltage carries out MPPT maximum power point tracking with Pv1.
Step 410, detects unlatching or the situation of closedown of Boost2, when detecting that Boost2 opens, forwarding step 411 to, when detecting that Boost2 closes, forwarding step 412 to.
Step 411, Boost2 with Bus Volt for disturbance voltage carries out MPPT maximum power point tracking.
Step 412, Boost2 is that disturbance voltage carries out MPPT maximum power point tracking with Pv2.
In the present embodiment, after determining the disturbance voltage of MPPT maximum power point tracking, also judge whether to there is the signal opened maximum power point and follow the tracks of fast, if, with period 1 be then the disturbance cycle by disturbance voltage disturbance to the first predeterminated voltage, be the disturbance cycle carry out disturbance afterwards with second round; If not, then carry out disturbance with the normal second disturbance cycle to disturbance voltage, the period 1 is less than second round.In an instantiation, the first predeterminated voltage is the magnitude of voltage of photovoltaic panel open-circuit voltage 80%.The signal that unlatching maximum power point is followed the tracks of fast can pre-set, when user needs unlatching maximum power point to follow the tracks of fast, by being arranged so that MPPT maximum power point tracking circuit 105 can detect this signal.Due to the too small meeting of disturbance cycle have the greatest impact power points follow the tracks of accuracy, therefore, in the present embodiment, after reaching the first predeterminated voltage, the disturbance cycle is returned to normal second round.
Please refer to Fig. 4, is the process flow diagram of the quick tracking step of maximum power point in the present embodiment.
Step 501, judges whether to there is the signal opened maximum power point and follow the tracks of fast, if so, then forwards step 502 to, if not, then forward step 503 to.
Step 502 is the disturbance cycle approach rapidly photovoltaic panel open-circuit voltage 80% with period 1 on the basis of disturbance voltage.
Step 503, after disturbance voltage reaches photovoltaic panel open-circuit voltage 80%, on the basis of current disturbance voltage with normal second round for the disturbance cycle carries out disturbance, obtain maximum power point voltage, the period 1 is less than second round.
Step 504, after every disturbance once, judges that whether the power after disturbance is larger than the power before disturbance, if so, then forwards step 505 to, if not, then forward step 506 to.
Step 505, is judged as in step 504 that the power before the power ratio disturbance after disturbance is large, illustrates that the point before disturbance is not maximum power point, therefore, then carry out disturbance next time with identical direction, judge whether current point is maximum power point.
Step 506, is judged as in step 504 that the power before the power ratio disturbance after disturbance is little, illustrates that the point before disturbance is maximum power point, and therefore, change perturbation direction, the electrical voltage point before returning disturbance, is maximum power point.
The two-way boost control method of the photovoltaic DC-to-AC converter that the present embodiment provides respectively according to Pv1 and the Pv2 unlatching of control Boost1 and Boost2 rationally and effectively or closedown, simultaneously also regulating and controlling busbar voltage to suitable value.In addition, MPPT maximum power point tracking can also be carried out respectively to two-way booster circuit, simultaneously select different disturbance voltage according to the access state of two-way booster circuit and photovoltaic panel and On/Off situation thereof, make the tracking of maximum power point more accurate, to realize the maximum power output of photovoltaic DC-to-AC converter.Also judge whether during MPPT maximum power point tracking that opening maximum power point follows the tracks of fast, if opened, then first with the less period 1 for the disturbance cycle carries out disturbance, after reaching the first predeterminated voltage fast, again with normal second round for the disturbance cycle carries out disturbance to obtain maximum power point, substantially increase the speed of MPPT maximum power point tracking, improve the work efficiency of photovoltaic DC-to-AC converter.
Above content is the further description done the application in conjunction with concrete embodiment, can not assert that the concrete enforcement of the application is confined to these explanations.For the application person of an ordinary skill in the technical field, under the prerequisite not departing from the application's design, some simple deduction or replace can also be made.
Claims (8)
1. a control method for two-way boost photovoltaic inverter, comprises two-way boosting and opens rate-determining steps, it is characterized in that, described two-way boosting is opened rate-determining steps and comprised:
Detect the first input voltage being input to the first booster circuit and the second input voltage being input to the second booster circuit input respectively;
First input voltage, the second input voltage and cut-in voltage are compared, determine unlatching or the closedown of the first booster circuit, the second booster circuit, be specially, when being judged as that the first input voltage and the second input voltage are less than cut-in voltage simultaneously, control to open the first booster circuit and the second booster circuit simultaneously; Be judged as that the first input voltage is less than cut-in voltage and the second input voltage is greater than cut-in voltage time, control unlatching first booster circuit and close the second booster circuit; Be judged as that the first input voltage is greater than cut-in voltage and the second input voltage is less than cut-in voltage time, control closedown first booster circuit and open the second booster circuit; When being judged as that the first input voltage and the second input voltage are greater than cut-in voltage simultaneously, control to close the first booster circuit and the second booster circuit simultaneously;
The control method of described two-way boost photovoltaic inverter also comprises MPPT maximum power point tracking step, and described MPPT maximum power point tracking step comprises:
Detect the access state of the first booster circuit and the second booster circuit and photovoltaic panel;
When the first booster circuit being detected and the second booster circuit is all linked into photovoltaic panel, then detect unlatching or the closedown situation of the first booster circuit and the second booster circuit, and according to opening or close the disturbance voltage of situation determination maximal power tracing, be specially, detect that the first booster circuit and the second booster circuit are opened simultaneously, then the maximal power tracing of the first booster circuit and the second booster circuit is all disturbance voltage with busbar voltage; Detect that the first booster circuit is opened, the second booster circuit cuts out, then the maximal power tracing of the first booster circuit and the second booster circuit respectively with busbar voltage and the second input voltage for disturbance voltage; Detect that the first booster circuit cuts out, the second booster circuit is opened, then the maximal power tracing of the first booster circuit and the second booster circuit respectively with the first input voltage and busbar voltage for disturbance voltage; Detect that the first booster circuit and the second booster circuit are closed simultaneously, then the maximal power tracing of the first booster circuit and the second booster circuit respectively with the first input voltage and the second input voltage for disturbance voltage;
When detecting that the first booster circuit is linked into photovoltaic panel, when second booster circuit does not access photovoltaic panel, then detect unlatching or the closedown situation of the first booster circuit, and according to opening or close the disturbance voltage of situation determination maximal power tracing, be specially, detect that the first booster circuit is opened, then the maximal power tracing of the first booster circuit take busbar voltage as disturbance voltage; Detect first booster circuit close, then the maximal power tracing of the first booster circuit with the first input voltage for disturbance voltage;
When detecting that the second booster circuit is linked into photovoltaic panel, when first booster circuit does not access photovoltaic panel, then detect unlatching or the closedown situation of the second booster circuit, and according to opening or close the disturbance voltage of situation determination maximal power tracing, be specially, detect that the second booster circuit is opened, then the maximal power tracing of the second booster circuit take busbar voltage as disturbance voltage; Detect second booster circuit close, then the maximal power tracing of the second booster circuit with the second input voltage for disturbance voltage; Described first input voltage is the input voltage of the first booster circuit, and described second input voltage is the input voltage of the second booster circuit.
2. control method as claimed in claim 1, is characterized in that, after the first input voltage being input to the first booster circuit and the second input voltage being input to the second booster circuit being detected, also comprises:
According to the first input voltage and the second input voltage determination busbar voltage, be specially, the first input voltage, the second input voltage and bus normal voltage are compared, by varying DC link voltage to the maximum voltage of three.
3. control method as claimed in claim 1, is characterized in that, after input voltage first input voltage the first booster circuit and the second booster circuit being detected and the second input voltage, also comprise:
According to the first input voltage and the second input voltage determination busbar voltage, be specially, the first input voltage, the second input voltage and bus normal voltage compared, varying DC link voltage is added the value after predeterminated voltage to the voltage that three is maximum.
4. the control method as described in any one of claim 1-3, it is characterized in that, after determining the disturbance voltage of MPPT maximum power point tracking, also comprise and judge whether to there is the signal opened maximum power point and follow the tracks of fast, if, with period 1 be then the disturbance cycle by disturbance voltage disturbance to the first predeterminated voltage, be the disturbance cycle carry out disturbance afterwards with second round; If not, be then the disturbance cycle carry out disturbance to disturbance voltage with second round, the described period 1 is less than second round.
5. a two-way boost photovoltaic inverter, is characterized in that, comprising:
First booster circuit, its voltage input end is connected with first via photovoltaic panel, and described first booster circuit exports after being boosted by the first input voltage;
Second booster circuit, its voltage input end is connected with the second road photovoltaic panel, described second booster circuit exports after being boosted by the second input voltage, and described second booster circuit and the first booster circuit are connected in parallel, and exports busbar voltage by the bus end after parallel connection;
Voltage conversion circuit, it is connected, for converting described busbar voltage to alternating voltage with the bus end after the first booster circuit and the second booster circuit parallel connection respectively; With
Control circuit, it is connected with the first booster circuit and the second booster circuit respectively, for obtaining the first input voltage and the second input voltage from the voltage input end of the first booster circuit and the second booster circuit respectively, and itself and cut-in voltage are compared, unlatching or the closedown of the first booster circuit and the second booster circuit is controlled according to comparative result, be specially, when control circuit is judged as that the first input voltage and the second input voltage are all less than cut-in voltage, control unlatching first booster circuit and the second booster circuit; Control circuit be judged as that the first input voltage is less than and the second input voltage is greater than cut-in voltage time, control unlatching first booster circuit and close the second booster circuit; Control circuit be judged as that the first input voltage is greater than and the second input voltage is less than cut-in voltage time, control closedown first booster circuit and open the second booster circuit; When control circuit is judged as that the first input voltage and the second input voltage are all greater than cut-in voltage, control closedown first booster circuit and the second booster circuit;
Described two-way boost photovoltaic inverter also comprises MPPT maximum power point tracking circuit, and it is connected with the first booster circuit and the second booster circuit respectively, for detecting the access state of the first booster circuit and the second booster circuit and photovoltaic panel;
When MPPT maximum power point tracking electric circuit inspection is all linked into photovoltaic panel to the first booster circuit and the second booster circuit, then detect unlatching or the closedown situation of the first booster circuit and the second booster circuit, and according to opening or close the disturbance voltage of situation determination maximal power tracing, be specially, detect that the first booster circuit and the second booster circuit are all opened, then the maximal power tracing of the first booster circuit and the second booster circuit is all disturbance voltage with busbar voltage; Detect that the first booster circuit is opened and the second booster circuit cuts out, then the maximal power tracing of the first booster circuit and the second booster circuit respectively with busbar voltage and the second input voltage for disturbance voltage; Detect that the first booster circuit cuts out and the second booster circuit is opened, then the maximal power tracing of the first booster circuit and the second booster circuit respectively with the first input voltage and busbar voltage for disturbance voltage; Detect that the first booster circuit and the second booster circuit are all closed, then the maximal power tracing of the first booster circuit and the second booster circuit respectively with the first input voltage and the second input voltage for disturbance voltage;
When MPPT maximum power point tracking electric circuit inspection is linked into photovoltaic panel to the first booster circuit, when second booster circuit does not access photovoltaic panel, then detect unlatching or the closedown situation of the first booster circuit, and according to opening or close the disturbance voltage of situation determination maximal power tracing, be specially, detect that the first booster circuit is opened, then the maximal power tracing of the first booster circuit take busbar voltage as disturbance voltage; Detect first booster circuit close, then the maximal power tracing of the first booster circuit with the first input voltage for disturbance voltage;
When MPPT maximum power point tracking electric circuit inspection is linked into photovoltaic panel to the second booster circuit, when first booster circuit does not access photovoltaic panel, then detect unlatching or the closedown situation of the second booster circuit, and according to opening or close the disturbance voltage of situation determination maximal power tracing, be specially, detect that the second booster circuit is opened, then the maximal power tracing of the second booster circuit take busbar voltage as disturbance voltage; Detect second booster circuit close, then the maximal power tracing of the second booster circuit with the second input voltage for disturbance voltage.
6. photovoltaic DC-to-AC converter as claimed in claim 5, it is characterized in that, described control circuit is also connected with the bus end after the first booster circuit and the second booster circuit parallel connection, for regulating busbar voltage, be specially, first input voltage and the second input voltage and bus normal voltage compare by control circuit, by varying DC link voltage to the maximum voltage of three.
7. photovoltaic DC-to-AC converter as claimed in claim 5, it is characterized in that, described control circuit is also connected with the bus end after the first booster circuit and the second booster circuit parallel connection, for regulating busbar voltage, be specially, first input voltage and the second input voltage and bus normal voltage compare by control circuit, and varying DC link voltage is added the value after predeterminated voltage to the voltage that three is maximum.
8. the photovoltaic DC-to-AC converter as described in any one of claim 5-7, it is characterized in that, after the disturbance voltage of MPPT maximum power point tracking circuit determination MPPT maximum power point tracking, MPPT maximum power point tracking circuit also judges whether to there is the signal opened maximum power point and follow the tracks of fast, if, MPPT maximum power point tracking circuit with period 1 be then the disturbance cycle by disturbance voltage disturbance to the first predeterminated voltage, be the disturbance cycle carry out disturbance afterwards with second round; If not, MPPT maximum power point tracking circuit is then the disturbance cycle carry out disturbance to disturbance voltage with second round, and the described period 1 is less than second round.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210570597.4A CN103116383B (en) | 2012-12-25 | 2012-12-25 | Two-way boost photovoltaic inverter and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210570597.4A CN103116383B (en) | 2012-12-25 | 2012-12-25 | Two-way boost photovoltaic inverter and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103116383A CN103116383A (en) | 2013-05-22 |
| CN103116383B true CN103116383B (en) | 2015-01-07 |
Family
ID=48414790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210570597.4A Expired - Fee Related CN103116383B (en) | 2012-12-25 | 2012-12-25 | Two-way boost photovoltaic inverter and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103116383B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312140B (en) * | 2013-06-07 | 2015-06-10 | 南京航空航天大学 | Starting method of multi-branch two-stage three-phase photovoltaic grid-connected inverter |
| CN104158208A (en) * | 2014-07-15 | 2014-11-19 | 阳光电源股份有限公司 | Single-stage photovoltaic grid-connected inverter, as well as control method and application thereof |
| CN104218873B (en) * | 2014-09-12 | 2017-09-15 | 艾思玛新能源技术（江苏）有限公司 | A kind of multichannel MPPT input type automatic distinguishing methods of photovoltaic DC-to-AC converter |
| CN105871324B (en) * | 2016-04-11 | 2017-12-15 | 厦门科华恒盛股份有限公司 | A kind of independent MPPT trackings of multichannel input photovoltaic inverting system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797892A (en) * | 2004-12-30 | 2006-07-05 | 中国科学院电工研究所 | Tracker for maximum power of light-volt electric-power production by solar energy, and control method |
| CN101304221A (en) * | 2008-06-19 | 2008-11-12 | 江苏津恒能源科技有限公司 | Solar photovoltaic interconnected inverter |
| CN102611341A (en) * | 2012-03-12 | 2012-07-25 | 深圳市英威腾电气股份有限公司 | Photovoltaic inverter and method for tracking maximum power of same |
| CN202550911U (en) * | 2012-04-17 | 2012-11-21 | 硅芯(肇庆)光电科技有限公司 | High-efficiency photovoltaic inverter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2372889A3 (en) * | 2010-03-31 | 2015-02-25 | SEMIKRON Elektronik GmbH & Co. KG | Circuit assembly and method for generating alternating current from a number of unregulated power supply units with output DC voltage which varies over time |
-
2012
- 2012-12-25 CN CN201210570597.4A patent/CN103116383B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797892A (en) * | 2004-12-30 | 2006-07-05 | 中国科学院电工研究所 | Tracker for maximum power of light-volt electric-power production by solar energy, and control method |
| CN101304221A (en) * | 2008-06-19 | 2008-11-12 | 江苏津恒能源科技有限公司 | Solar photovoltaic interconnected inverter |
| CN102611341A (en) * | 2012-03-12 | 2012-07-25 | 深圳市英威腾电气股份有限公司 | Photovoltaic inverter and method for tracking maximum power of same |
| CN202550911U (en) * | 2012-04-17 | 2012-11-21 | 硅芯(肇庆)光电科技有限公司 | High-efficiency photovoltaic inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103116383A (en) | 2013-05-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Tani et al. | Energy management in the decentralized generation systems based on renewable energy—Ultracapacitors and battery to compensate the wind/load power fluctuations | |
| CN102545257B (en) | Solar photovoltaic generating single-phase grid-connected inverter and control method thereof | |
| CN102170241B (en) | System and method for a single stage power conversion system | |
| CN102780221B (en) | System and method for controlling online type photovoltaic power generation microgrid without storage device | |
| CN205212446U (en) | Single -phase photovoltaic grid -connected inverter controlling means | |
| CN101697423B (en) | Non-active disturbance maximum power tracking method in photovoltaic grid-connected inverting system | |
| CN103312140B (en) | Starting method of multi-branch two-stage three-phase photovoltaic grid-connected inverter | |
| CN102722212A (en) | Maximum power point tracking method for photovoltaic power generation system under non-uniform illumination | |
| CN202663326U (en) | Power tracking control device and photovoltaic power generation system | |
| CN103116383B (en) | Two-way boost photovoltaic inverter and control method thereof | |
| CA2849989A1 (en) | Power converter islanding detection | |
| CN101752877A (en) | Photovoltaic synchronization inverter with photovoltaic array IV test function and test method | |
| Hoarca et al. | On the micro-inverter performance based on three MPPT controllers | |
| KR100716537B1 (en) | control module for distributed generation energy source and method thereof | |
| CN102591399A (en) | Perturbation and observation method for tracking maximum power point of photovoltaic grid-connected generating system | |
| CN105490320B (en) | Photovoltaic plant energy storage method and system | |
| Sivakumar et al. | Maximum power extractions in a single stage PV sourced grid connected inverter during low irradiations and nonlinear loads | |
| CN109167392B (en) | System control method, photovoltaic system and air conditioning system | |
| CN103532423B (en) | Complex controll current source type combining inverter under a kind of rest frame | |
| CN103475014A (en) | Electric energy quality controller of wind driven generator based on battery energy storage and control method | |
| Zhou et al. | Development of Single-phase photovoltaic Grid-connected inverter based on dsp control | |
| CN110445183A (en) | Photovoltaic converter autonomous mode method for handover control in micro-grid system | |
| Cavalcanti et al. | Unified power quality conditioner in a grid-connected photovoltaic system | |
| Liu et al. | Investigation of photovoltaic array simulators based on different kinds of PWM rectifiers | |
| Ding et al. | Unified control of smoothing out wind power fluctuations and active power filtering by an energy storage system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20211225 |