CN103872939A - Two-way boosted circuit inverter system and controlling method thereof - Google Patents
Two-way boosted circuit inverter system and controlling method thereof Download PDFInfo
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- CN103872939A CN103872939A CN201210552822.1A CN201210552822A CN103872939A CN 103872939 A CN103872939 A CN 103872939A CN 201210552822 A CN201210552822 A CN 201210552822A CN 103872939 A CN103872939 A CN 103872939A
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Abstract
The invention provides a two-way boosted circuit inverter system and a controlling method of the two-way boosted circuit inverter system. The two-way boosted circuit inverter system comprises a boosted module, an inverting module and a controlling module, wherein the inverting module calculates the initial rated power of the boosted module, a first power detecting circuit detects the real power of a first boosted circuit, a second power detecting circuit detects the real power of a second boosted circuit, and the controlling module regulates the rated power according to the real powers of the two way boosted circuits. The two-way boosted circuit inverter system dynamically regulates the rated power according to the real powers of the two way boosted circuits. The controlling method reassigns the rated power by changing the rated powers of the two boosted circuits when the real power of one way boosted circuit is equal to the rated power and the real power of the other way boosted circuit is smaller than the rated power, so that the boosted circuits can receive more real power, and power sent to a power grid can be increased.
Description
Technical field
The present invention relates to circuit design technique field, particularly a kind of two-way booster circuit inverter system and control method thereof of the rated power that can change dynamically two booster circuits.
Background technology
Along with the adjustment of energy resource structure, people transfer to sight on new forms of energy gradually, and especially European Countries has benefited from the preferential policy of Europe to new forms of energy development, and photovoltaic inversion industry presents the flourish impetus.Each important photovoltaic inversion manufacturer, in selling product, noticed especially local unique environments, taking Germany as example, mostly German is to live in taking single family as unit an only house, and top, house is low in the majority with high two ends, centre, based on this reason, in the time that solar panel is installed, in the both sides on roof, solar panel is all installed, consider above-mentioned factor, the photovoltaic manufacturers design that some are main there is the inverter of two-way booster circuit.
As shown in Figure 1, existing two-way booster circuit inverter design has two-way booster circuit, be respectively the first booster circuit 11 and the second booster circuit 12, the first booster circuit 11 and the second booster circuit 12 are all connected in parallel in the 3rd capacitor C 3 as can be seen from Figure 1, this just provides condition for controlling separately the first booster circuit 11 and the second booster circuit 12, the input of the first booster circuit 11 and the second booster circuit 12 is connected with DC power supply PV1, PV2 respectively simultaneously, and DC power supply PV1, PV2 are here provided by solar panel.The existing control method to this two-way booster circuit, take the power of inverter direct-flow side to be divided into two, and using point after performance number as the rated power of the first booster circuit 11 and the second booster circuit 12, this rated power, with the size variation of actual power, has not so just used two-way booster circuit.
But, use the control method of this two-way booster circuit, the energy that can not utilize fully photovoltaic panel to produce, this is because this control method is not considered the characteristic of photovoltaic panel, the energy that photovoltaic panel produces is along with the enhancing of intensity of illumination increases, the intensity of illumination receiving under photovoltaic panel reality in both sides, roof is not identical, this actual power that just causes arriving two-way booster circuit is also different, and the method that existing control two-way boosts is to compose identical rated power to two-way booster circuit, and this rated power is changeless, so likely can cause the actual power of a side to reach rated power, but due to the restriction of rated power, actual power can not be raise again, and opposite side actual power does not reach rated power, even actual power is mutually far short of what is expected with rated power, like this, just cause having the ability of the more power of generation, but due to rated power distribute incorrect, and the appearance of the phenomenon that this part energy dissipation has been fallen.After this situation occurs, for user, in waste energy, also reduce the economic worth that photovoltaic generation brings.
Summary of the invention
The present invention is intended at least solve the technical problem existing in prior art, has proposed to special innovation a kind of two-way booster circuit inverter system and control method thereof.
In order to realize above-mentioned purpose of the present invention, according to a first aspect of the invention, the invention provides a kind of two-way booster circuit inverter system, comprise: boost module, inversion module and control module, the output of described boost module is connected with the 3rd electric capacity with the described inversion module of parallel connection, and described inversion module is used for the initial nominal power that the direct current of input is transformed into alternating current and calculates described boost module; Described boost module comprises the first booster circuit and the second booster circuit; The input of described the first booster circuit is connected with the first DC power supply, and described the first booster circuit is also connected with the first power-sensing circuit, and described the first power-sensing circuit is for detection of the actual power of described the first booster circuit; The input of described the second booster circuit is connected with the second DC power supply, and described the second booster circuit is also connected with the second power-sensing circuit, and described the second power-sensing circuit is for detection of the actual power of described the second booster circuit; Described control module is connected respectively with inversion module with described boost module, and described control module is adjusted the size of the rated power of two-way booster circuit according to the big or small comparative result of the actual power of two-way booster circuit and rated power.
Two-way booster circuit inverter system of the present invention is dynamically adjusted the size of its rated power according to the size of the actual power of two-way booster circuit, by the amendment of the rated power to two booster circuits, make booster circuit can receive more actual power, be dealt into electricity on electrical network also corresponding more.
In a preferred embodiment of the present invention, described the first booster circuit comprises the first inductance, the first diode and an IGBT, the input of described the first inductance is connected with the positive pole of described the first DC power supply, described the first diode is connected between the output of described the first inductance and the input of described inversion module, and a described IGBT is connected between the output of described the first inductance and the negative pole of the first DC power supply; Described the second booster circuit comprises the second inductance, the second diode and the 2nd IGBT, the input of described the second inductance is connected with the positive pole of described the second DC power supply, described the second diode is connected between the output of described the second inductance and the input of described inversion module, and described the 2nd IGBT is connected between the output of described the second inductance and the negative pole of the second DC power supply.
The first booster circuit of the present invention is in the time of an IGBT conducting, and the first inductance is to the 3rd capacitor charging, and after charging finishes, an IGBT ends.In like manner, the second booster circuit is in the time of the 2nd IGBT conducting, and the second inductance is to the 3rd capacitor charging, and after charging finishes, the 2nd IGBT ends.By controlling conducting and the cut-off of an IGBT and the 2nd IGBT, the output of two-way booster circuit is all the 3rd capacitor charging, finally by the 3rd electric capacity, energy is passed to inversion module again.The first diode and the second diode are used for preventing that the 3rd electric capacity from discharging over the ground.
In a preferred embodiment of the present invention, described the first power-sensing circuit comprises the first voltage sampling circuit and the first current sampling circuit, described the first voltage sampling circuit is in parallel with described the first DC power supply, and described the first current sampling circuit is connected with the input of described the first booster circuit.
In another kind of preferred embodiment of the present invention, described the second power-sensing circuit comprises second voltage sample circuit and the second current sampling circuit, described second voltage sample circuit is in parallel with described the second DC power supply, and described the second current sampling circuit is connected with the input of described the second booster circuit.
The first power-sensing circuit that the present invention consists of the first voltage sampling circuit and the first current sampling circuit detects the actual power of the first booster circuit; The second power-sensing circuit consisting of second voltage sample circuit and the second current sampling circuit detects the actual power of the second booster circuit.This detection architecture is simple, convenient operation.
In a preferred embodiment of the present invention, also comprise the first electric capacity and the second electric capacity, described the first electric capacity is in parallel with described the first DC power supply, and described the second electric capacity is in parallel with described the second DC power supply.
The present invention adopts the first electric capacity and the second electric capacity to carry out filtering, improves the flatness of the first DC power supply and the second DC power supply input current.
In another kind of preferred embodiment of the present invention, also comprise tertiary voltage testing circuit, described tertiary voltage testing circuit is in parallel with described inversion module.
The present invention gathers the d. c. voltage signal of inversion module input by tertiary voltage testing circuit, for inversion module is carried out to DC input voitage abnormal protection and inversion control.
In order to realize above-mentioned purpose of the present invention, according to a first aspect of the invention, the invention provides a kind of two-way booster circuit inverter system control method, comprise the steps:
S1: the rated power that the first booster circuit and the second booster circuit are set respectively;
S2: the actual power that detects respectively the first booster circuit and the second booster circuit;
S3: the actual power of each booster circuit and its rated power are compared, adjust the size of rated power according to the size of actual power, in the case of the rated power of the first booster circuit and the rated power sum of the second booster circuit remain unchanged, make the rated power of each booster circuit all be greater than its actual power;
S4: return to step S2, until two-way booster circuit inverter quits work, exit.
Two-way booster circuit inverter system control method of the present invention is by the rated power of two booster circuits of amendment, guarantee system is in occurring that the actual power of a road booster circuit equals its rated power, the actual power of another road booster circuit is less than its rated power, carry out the assignment again of rated power, make booster circuit can receive more actual power, improved the electric weight being dealt on electrical network.
In a preferred embodiment of the present invention, the rated power in described step S1 is initial nominal power, and the setting steps of described initial nominal power is:
S11: the power that calculates the DC side of inversion module;
S12: the power of inversion module DC side is reduced by half;
S13: the inversion module DC side power after reducing by half is set to respectively to the initial nominal power of the first booster circuit and the initial nominal power of the second booster circuit.
The present invention is at inversion module during in initial condition, inversion module DC side power reduced by half and be set to the initial nominal power of the first booster circuit and the second booster circuit, and this set method is simple, is easy to realize.
In another kind of preferred embodiment of the present invention, in described step S2, detect the actual power of described the first booster circuit by the first power-sensing circuit, detect the actual power of described the second booster circuit by the second power-sensing circuit.
In another preferred embodiment of the present invention, described step S3 comprises the steps:
S31: the size of the size of the actual power of each booster circuit and its rated power is compared;
S32: judge whether that the actual power that meets the first booster circuit equals its rated power, and the actual power value of the second booster circuit is less than its rated power;
S33: if the actual power of the first booster circuit equals its rated power, and the actual power value of the second booster circuit is less than its rated power, make the rated power p1=[p1+ ((p2-P2)/2) of the first booster circuit], the rated power p2=[p2-((p2-P2)/2) of the second booster circuit], and return to step S32, otherwise execution step S34, wherein, the rated power of p1 the first booster circuit, p2 is the rated power of the second booster circuit, P1 is the actual power of the first booster circuit, and P2 is the actual power of the second booster circuit;
S34: judge whether that the actual power value that meets the second booster circuit equals its rated power, and the actual power value of the first booster circuit is less than its rated power;
S35: if the actual power value of the second booster circuit equals its rated power, and the actual power value of the first booster circuit is less than its rated power, make the rated power p2=[p2+ ((p1-P1)/2) of the second booster circuit], first gives the power-handling capability p1=[p1-((p1-P1)/2) of booster circuit], and return to step S32, otherwise execution step S36;
S36: the rated power of two-way booster circuit is not modified, exit.
The present invention, giving the rated power of the first booster circuit and the rated power assignment again of the second booster circuit, has the process of getting half value, can prevent that two-way booster circuit inverter from frequently changing rated power.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination is understood becoming the description of embodiment obviously and easily, wherein:
Fig. 1 is the structural representation of two-way booster circuit inverter system in the prior art; .
Fig. 2 be the present invention is a kind of preferably execute mode in the structural representation of two-way booster circuit inverter system;
Fig. 3 is the circuit diagram of the inverter system of two-way booster circuit shown in Fig. 2 of the present invention;
Fig. 4 is the flow chart of two-way booster circuit inverter system control method of the present invention;
Fig. 5 is the flow chart that initial nominal power is set in a kind of preferred embodiment of the present invention;
Fig. 6 is the flow chart that detects actual power value in a kind of preferred embodiment of the present invention;
Fig. 7 is the flow chart of in a kind of preferred embodiment of the present invention, rated power being adjusted.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " longitudinally ", " laterally ", " on ", orientation or the position relationship of the instruction such as D score, 'fornt', 'back', " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward " be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, construct and operation with specific orientation, therefore can not be interpreted as limitation of the present invention.
In description of the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be to be directly connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
The invention provides a kind of two-way booster circuit inverter system, as shown in Figure 2, this two-way booster circuit inverter system comprises boost module 1, inversion module 2 and control module, and wherein, the output of boost module 1 is connected with the 3rd capacitor C 3 with inversion module in parallel 2.This boost module 1 comprises two-way booster circuit, i.e. the first booster circuit 11 and the second booster circuit 12, the output of this first booster circuit 11 is all in parallel with the 3rd capacitor C 3 with the output of the second booster circuit 12, and this just provides condition for controlling separately the first booster circuit 11 and the second booster circuit 12.
In the present embodiment, the input of the first booster circuit 11 is connected with the first DC power supply PV1, and the first booster circuit 11 is also connected with the first power-sensing circuit, and the first power-sensing circuit is for detection of the actual power of the first booster circuit 11.The input of the second booster circuit 12 is connected with the second DC power supply PV2, and the second booster circuit 12 is also connected with the second power-sensing circuit, and the second power-sensing circuit is for detection of the actual power of described the second booster circuit 12.It should be noted that, actual power refers to the actual power of the input of the first booster circuit 11 and the input of the second booster circuit 12 in the present invention.
In the present embodiment, this first DC power supply PV1 and the second DC power supply PV2 can be arbitrarily can be to the DC power supply of external world power supply, are specifically as follows but the DC power supply that is not limited to be provided by solar panel.In an implementation being more preferably of the present invention, the first DC power supply PV1 and the second DC power supply PV2 are provided respectively by two groups of solar panels that are arranged in both sides, roof, one group of solar panel provides the first DC power supply PV1, another group solar panel provides the second DC power supply PV2, and the polylith solar panel in these two groups of solar panels can be combined by the mode of serial or parallel connection.This two groups of solar panel generation currents and voltage, after the booster circuit being connected respectively with them boosts, by inversion module 2, the direct current of input is transformed into alternating current, and alternating current is exported to electrical network, this inversion module 2 is also for calculating the initial nominal power of two-way booster circuit of boost module 1.
In the present embodiment, control module (not shown in FIG.) is connected respectively with inversion module 2 with boost module 1, this control module receives after the initial nominal power and actual power of two-way booster circuit, adjust the size of its rated power according to the actual power size of two-way booster circuit, by the amendment of the rated power to two booster circuits, make booster circuit can receive more actual power, be dealt into electricity on electrical network also corresponding more.
As shown in Figure 3, the first booster circuit 11 comprises the first inductance L 1, the first diode D1 and an IGBT Q1, wherein, the input of the first inductance L 1 is connected with the positive pole of the first DC power supply PV1, the first diode D1 is connected between the output of the first inductance L 1 and the input of inversion module 2, the one IGBTQ1 is connected between the output of the first inductance L 1 and the negative pole of the first DC power supply PV1, specifically the drain electrode of an IGBT Q1 is connected with the output of the first inductance L 1, the source electrode of the one IGBT Q1 is connected with the negative pole of the first DC power supply PV1, the grid of the one IGBT Q1 is connected with the first clock signal (not shown in FIG.), by conducting and the cut-off of the first clock signal control the one IGBT Q1, thereby realizing the first inductance L 1 charges to the 3rd capacitor C 3.The second booster circuit 12 comprises the second inductance L 2, the second diode D2 and the 2nd IGBT Q2, the input of the second inductance L 2 is connected with the positive pole of the second DC power supply PV2, the second diode D2 is connected between the output of described the second inductance L 2 and the input of inversion module 2, the 2nd IGBT Q2 is connected between the output of the second inductance L 2 and the negative pole of the second DC power supply PV2, specifically the drain electrode of the 2nd IGBT Q2 is connected with the output of the second inductance L 2, the source electrode of the 2nd IGBT Q2 is connected with the negative pole of the first DC power supply PV1, the grid of the 2nd IGBT Q2 is connected with second clock signal (not shown in FIG.), by conducting and the cut-off of second clock signal controlling the 2nd IGBT Q2, thereby realizing the second inductance L 2 charges to the 3rd capacitor C 3.
The first booster circuit 11 of the present invention and the second booster circuit 12 are respectively by controlling conducting and the cut-off of an IGBT Q1 and the 2nd IGBT Q2, the output of two-way booster circuit is all that the 3rd capacitor C 3 is charged, and finally by the 3rd capacitor C 3, energy is passed to inversion module 2 again.This inversion module 2 is converted to alternating current supply electrical network except booster circuit being passed to the direct current of coming, also will utilize the inversion capacity calculation of inversion module 2 to go out the direct current power of the DC side of inversion module 2, the half value of this direct current power will use as the initial nominal power of the first booster circuit 11 and the second booster circuit 12.As shown in Figure 3, this inversion module 2 comprises four IGBT, wherein, the drain electrode of the drain electrode of the 3rd IGBT Q3 and the 5th IGBT Q5 links together as one end of the input of inversion module 2, the source electrode of the source electrode of the 4th IGBT Q4 and the 6th IGBT Q6 links together as the other end of the input of inversion module 2, the source electrode of the 3rd IGBT Q3 is connected with the drain electrode of the 4th IGBT Q4, and the source electrode of the 5th IGBT Q5 is connected with the drain electrode of the 6th IGBT Q6.
Visible in conjunction with Fig. 2 and Fig. 3, the first power-sensing circuit of the present invention comprises the first voltage sampling circuit V1 and the first current sampling circuit A1, this first voltage sampling circuit V1 is in parallel with the first DC power supply PV1, and the first current sampling circuit A1 is connected with the input of the first booster circuit 11.The second power-sensing circuit comprises second voltage sample circuit V2 and the second current sampling circuit A2, and second voltage sample circuit V2 is in parallel with described the second DC power supply PV2, and the second current sampling circuit A2 is connected with the input of the second booster circuit 12.The first power-sensing circuit that the present invention consists of the first voltage sampling circuit V1 and the first current sampling circuit A1 detects the actual power of the first booster circuit 11; The second power-sensing circuit consisting of second voltage sample circuit V2 and the second current sampling circuit A2 detects the actual power of the second booster circuit 12.This detection architecture is simple, convenient operation.
In a kind of execution mode being more preferably of the present invention, the first voltage sampling circuit V1 comprises the first sampling resistor (not shown), by this first sampling resistor, the input DC voltage value of the first booster circuit 11 is sampled, the first current sampling circuit A1 comprises the first current sensor (not shown), by this first current sensor, the input DC current values of the first booster circuit 11 is sampled, the first voltage sampling circuit V1 and the first current sampling circuit A1 are sent to control module by the signal collecting respectively, control module calculates magnitude of voltage and the current value of the first booster circuit 11 reality.Second voltage sample circuit V2 comprises the second sampling resistor (not shown), by this second sampling resistor, the input DC voltage value of the second booster circuit 12 is sampled, the second current sampling circuit A2 comprises the second current sensor (not shown), by this second current sensor, the input DC current values of the second booster circuit 12 is sampled, second voltage sample circuit V2 and the second current sampling circuit A2 are sent to control module by the signal collecting respectively, control module calculates magnitude of voltage and the current value of the second booster circuit 12 reality.
。In the present embodiment, this two-way booster circuit inverter system also comprises the first capacitor C 1 and the second capacitor C 2, and this first capacitor C 1 is in parallel with the first DC power supply PV1, and this second capacitor C 2 is in parallel with the second DC power supply PV2.The present invention, by adopting the first capacitor C 1 and the second capacitor C 2 to carry out filtering, improves the flatness of the first DC power supply PV1 and the second DC power supply PV2 input current.
In the other preferred implementation of the present invention, this two-way booster circuit inverter system also comprises tertiary voltage testing circuit V3, and V3 is in parallel with inversion module 2 for this tertiary voltage testing circuit.Gather the d. c. voltage signal of inversion module input by this tertiary voltage testing circuit V3, realize inversion module is carried out to DC input voitage abnormal protection and inversion control.
The present invention also provides a kind of two-way booster circuit inverter system control method, and as shown in Figure 4, this control method comprises the steps:
Step S1, arranges respectively the rated power of the first booster circuit 11 and the second booster circuit 12;
Step S2, detects respectively the actual power of the first booster circuit 11 and the second booster circuit 12;
Step S3, the actual power of each booster circuit and its rated power are compared, adjust the size of rated power according to the size of actual power, in the case of the rated power of the first booster circuit 11 and the rated power sum of the second booster circuit 12 remain unchanged, make the rated power of each booster circuit all be greater than its actual power;
Step S4, returns to step S2, until two-way booster circuit inverter quits work, exits.
Two-way booster circuit inverter system control method of the present invention is by the rated power of two booster circuits of amendment, guarantee system is in occurring that the actual power of a road booster circuit equals its rated power, the actual power of another road booster circuit is less than its rated power, carry out the assignment again of rated power, make booster circuit can receive more actual power, improve the electric weight being dealt on electrical network, can obtain more economic benefit.
In the present embodiment, the rated power in step S1 is initial nominal power, and as shown in Figure 5, the setting steps of initial nominal power is:
Step S11, control module is calculated the power of the DC side of inversion module 2, the power of this DC side is the maximum direct current power that the DC side of inversion module 2 can produce, in the present embodiment, concrete computing formula is: the inversion ability/direct current of direct current power=inversion module is delivered the transfer ratio of stream.
Step S12, reduces by half the power of the DC side of inversion module 2;
Step S13, is set to respectively the initial nominal power of the first booster circuit 11 and the initial nominal power of the second booster circuit 12 by the DC side power of the inversion module after reducing by half 2.
In step S2, detect the actual power of the first booster circuit 11 by the first power-sensing circuit, detect the actual power of the second booster circuit 12 by the second power-sensing circuit.As shown in Figure 6, in the present embodiment, concrete detecting step is:
Step S21, the first voltage sampling circuit V1 and the first current sampling circuit A1 by the first booster circuit 11 inputs detect the first booster circuit 11 input direct current signals, obtain DC voltage value and the DC current values of the first booster circuit 11, and then obtain the actual power of the first booster circuit 11 inputs.
Step S22, second voltage sample circuit V2 and the second current sampling circuit A2 by the second booster circuit 12 inputs detect the second booster circuit 12 input direct current signals, obtain DC voltage value and the DC current values of the second booster circuit 12, and then obtain the actual power of the second booster circuit 12 inputs.
Step S23, DC voltage value, the DC current values of the first booster circuit 11 calculating in applying step S21, the input actual power P1. of calculating the first booster circuit 11
Step S24, DC voltage value, the DC current values of the second booster circuit 12 calculating in applying step S22, the input actual power P2 of calculating the second booster circuit 12.
In the present embodiment, as shown in Figure 7, step S3 comprises the steps:
Step S31, control module (as CPU) obtains current actual power P1 and the current actual power P2 of the second booster circuit 12 of rated power p1, the rated power p2 of the second booster circuit 12, the first booster circuit 11 of the first booster circuit 11, and the size of the size of the actual power of each booster circuit and its rated power is compared.
Step S32, judge whether that the actual power that meets the first booster circuit 11 equals its rated power, and the actual power value of the second booster circuit 12 is less than its rated power, meet expression formula (P1==p1) & & (P2 < p2).
Step S33, if the actual power of the first booster circuit 11 equals its rated power, and the actual power value of the second booster circuit 12 is less than its rated power, make the rated power p1=[p1+ ((p2-P2)/2) of the first booster circuit 11], the rated power p2=[p2-((p2-P2)/2) of the second booster circuit 12], and return to step S32, otherwise execution step S34.
Step S34, judge whether that the actual power that meets the second booster circuit 12 equals its rated power, and the actual power value of the first booster circuit 11 is less than its rated power, meet expression formula (P2==p2) & & (P1 < p1).
Step S35, if the actual power value of the second booster circuit 12 equals its rated power, and the actual power value of the first booster circuit 11 is less than its rated power, make the rated power p2=[p2+ ((p1-P1)/2) of the second booster circuit 12], first gives the power-handling capability p1=[p1-((p1-P1)/2) of booster circuit], and return to step S32, otherwise execution step S36.
S36: the rated power of two-way booster circuit is not modified, exit.
Three steps of the inventive method, only inversion module 2 during in initial condition 3 steps all carry out and arrive in order, other moment is all the dynamic adjustment that realizes rated power by completing steps S2 and step S3.
The present invention is giving the rated power of the first booster circuit 11 and the rated power of the second booster circuit 12 again when assignment, the rated power sum of the rated power of the first booster circuit 11 and the second booster circuit 12 remains unchanged, and the rated power of each booster circuit is all greater than its actual power.Step S33 in step S3 and S35 have a process of getting half value, this is to consider that the intensity of illumination that two groups of photovoltaic panels receive is constantly converting, for fear of frequently occurring that booster circuit previous moment actual power is less than rated power, and next moment actual power is greater than the phenomenon of rated power, because the appearance of this phenomenon can cause system will change frequently rated power.
Control method of the present invention makes the first booster circuit 11 and the second booster circuit 12 obtain dynamically rated power along with the power of intensity of illumination, actual power that like this can Yi road booster circuit equals rated power and the actual power of another road booster circuit is less than rated power, or even be less than when a lot of, be that the first booster circuit 11 and the second booster circuit 12 are composed rated power again, ensure can be not always not equal its rated power and the actual power of another road booster circuit is less than the state of its rated power in the actual power of a road booster circuit.Make booster circuit can receive more actual power, user can, to electrical network for more electricity, obtain more economic benefit.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And specific features, structure, material or the feature of description can be with suitable mode combination in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, amendment, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (10)
1. a two-way booster circuit inverter system, is characterized in that, comprising: boost module, inversion module and control module,
The output of described boost module is connected with the 3rd electric capacity with inversion module in parallel, and described inversion module exports and calculate the initial nominal power of described boost module for the direct current of input is transformed into alternating current;
Described boost module comprises the first booster circuit and the second booster circuit;
The input of described the first booster circuit is connected with the first DC power supply, and described the first booster circuit is also connected with the first power-sensing circuit, and described the first power-sensing circuit is for detection of the actual power of described the first booster circuit;
The input of described the second booster circuit is connected with the second DC power supply, and described the second booster circuit is also connected with the second power-sensing circuit, and described the second power-sensing circuit is for detection of the actual power of described the second booster circuit;
Described control module is connected respectively with inversion module with described boost module, and described control module is adjusted the size of the rated power of two-way booster circuit according to the big or small comparative result of the actual power of two-way booster circuit and rated power.
2. two-way booster circuit inverter system as claimed in claim 1, it is characterized in that, described the first booster circuit comprises the first inductance, the first diode and an I GBT, the input of described the first inductance is connected with the positive pole of described the first DC power supply, described the first diode is connected between the output of described the first inductance and the input of described inversion module, and a described IGBT is connected between the output of described the first inductance and the negative pole of the first DC power supply;
Described the second booster circuit comprises the second inductance, the second diode and the 2nd IGBT, the input of described the second inductance is connected with the positive pole of described the second DC power supply, described the second diode is connected between the output of described the second inductance and the input of described inversion module, and described the 2nd I GBT is connected between the output of described the second inductance and the negative pole of the second DC power supply.
3. two-way booster circuit inverter system as claimed in claim 1, it is characterized in that, described the first power-sensing circuit comprises the first voltage sampling circuit and the first current sampling circuit, described the first voltage sampling circuit is in parallel with described the first DC power supply, and described the first current sampling circuit is connected with the input of described the first booster circuit.
4. two-way booster circuit inverter system as claimed in claim 1, it is characterized in that, described the second power-sensing circuit comprises second voltage sample circuit and the second current sampling circuit, described second voltage sample circuit is in parallel with described the second DC power supply, and described the second current sampling circuit is connected with the input of described the second booster circuit.
5. two-way booster circuit inverter system as claimed in claim 1, is characterized in that, also comprises the first electric capacity and the second electric capacity, and described the first electric capacity is in parallel with described the first DC power supply, and described the second electric capacity is in parallel with described the second DC power supply.
6. two-way booster circuit inverter system as claimed in claim 1, is characterized in that, also comprises tertiary voltage testing circuit, and described tertiary voltage testing circuit is in parallel with described inversion module.
7. a two-way booster circuit inverter system control method, is characterized in that, comprises the steps:
S1: the rated power that the first booster circuit and the second booster circuit are set respectively;
S2: the actual power that detects respectively the first booster circuit and the second booster circuit;
S3: the actual power of each booster circuit and its rated power are compared, adjust the size of rated power according to the size of actual power, in the case of the rated power of the first booster circuit and the rated power sum of the second booster circuit remain unchanged, make the rated power of each booster circuit all be greater than its actual power;
S4: return to step S2, until two-way booster circuit inverter quits work, exit.
8. two-way booster circuit inverter system control method as claimed in claim 7, is characterized in that, the rated power in described step S1 is initial nominal power, and the setting steps of described initial nominal power is:
S11: the power that calculates the DC side of inversion module;
S12: the power of inversion module DC side is reduced by half;
S13: the inversion module DC side power after reducing by half is set to respectively to the initial nominal power of the first booster circuit and the initial nominal power of the second booster circuit.
9. two-way booster circuit inverter system control method as claimed in claim 8, it is characterized in that, in described step S2, detect the actual power of described the first booster circuit by the first power-sensing circuit, detect the actual power of described the second booster circuit by the second power-sensing circuit.
10. two-way booster circuit inverter system control method as claimed in claim 7, is characterized in that, described step S3 comprises the steps:
S31: the size of the size of the actual power of each booster circuit and its rated power is compared;
S32: judge whether that the actual power that meets the first booster circuit equals its rated power, and the actual power value of the second booster circuit is less than its rated power;
S33: if the actual power of the first booster circuit equals its rated power, and the actual power value of the second booster circuit is less than its rated power, make the rated power p1=[p1+ ((p2-P2)/2) of the first booster circuit], the rated power p2=[p2-((p2-P2)/2) of the second booster circuit], and return to step S32, otherwise execution step S34, wherein, p1 is the rated power of the first booster circuit, p2 is the rated power of the second booster circuit, P1 is the actual power of the first booster circuit, and P2 is the actual power of the second booster circuit;
S34: judge whether that the actual power value that meets the second booster circuit equals its rated power, and the actual power value of the first booster circuit is less than its rated power;
S35: if the actual power value of the second booster circuit equals its rated power, and the actual power value of the first booster circuit is less than its rated power, make the rated power p2=[p2+ ((p1-P1)/2) of the second booster circuit], first gives the power-handling capability p1=[p1-((p1-P1)/2) of booster circuit], and return to step S32, otherwise execution step S36;
S36: the rated power of two-way booster circuit is not modified, exit.
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