CN102646977A - Secondary booster circuit for boosting voltage based on MPPT (maximum power point tracking) and distributed solar battery pack - Google Patents
Secondary booster circuit for boosting voltage based on MPPT (maximum power point tracking) and distributed solar battery pack Download PDFInfo
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- CN102646977A CN102646977A CN2012101180680A CN201210118068A CN102646977A CN 102646977 A CN102646977 A CN 102646977A CN 2012101180680 A CN2012101180680 A CN 2012101180680A CN 201210118068 A CN201210118068 A CN 201210118068A CN 102646977 A CN102646977 A CN 102646977A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a secondary booster circuit for boosting voltage based on MPPT and a distributed solar battery pack. The secondary booster circuit for boosting voltage based on MPPT is characterized in that the output power after secondary voltage boosting is stable in a certain period of time by using a super capacitor and a charging balance module, and the output power can be stabilized by further using the super capacitor. The distributed solar battery pack comprises a battery pack consisting of N single solar panels (11 to 1n) in parallel connection, front-end circuits (21 to 2n) of the secondary booster circuit for boosting voltage based on MPPT, an inverter (3), a power network module, an external connector (5) and a communication bus, wherein each solar panel is in parallel connected with the front-end circuit. In comparison with the prior art, the distributed solar battery pack provided by the invention can prevent breakdown of the solar battery pack resulting from the heat island effect, and can ensure high power generation efficiency of the solar battery pack.
Description
Technical field
The present invention relates to a kind of high-effect solar battery group that is applied to solar power system, particularly relate to a kind of solar battery group design of the secondary booster circuit that boosts based on MPPT.
Background technology
In solar power system, the low-voltage AC that needs earlier solar panel to be sent is elevated to the voltage that is complementary with electric main, direct current is become to exchange the dextrorotation ripple again, is connected to the grid synchronously with civil power.The method that generally adopts at present is that hundreds of to 1,000 solar cell series connection backs are formed solar battery group, can obtain the voltage of hectovolt to 5 hectovolt like this.But this series-connected solar cells group of the prior art is formed in parallel by N string solar panel group, and every string cell plate group is undertaken freely connecting by a connector, thereby connects the MPPT circuit respectively, and its circuit is as shown in Figure 1.The technological deficiency that this scheme exists is:
1) when a veneer in a string solar panel group breaks down, need to extract whole string cell plate group, influenced generated output to solar energy;
2) this design seems simple; But in fact because not matching and the environment for use difference of solar cell causes the low solar battery group output current of output voltage little, more electric energy becomes heat energy makes the solar cell heating; Form heat island, cause solar cell to damage.
In order to address this problem, the secondary booster circuit that boosts based on MPPT that the present invention installs on each packaged solar panel that band peak power output point follows the tracks of additional, the voltage that every cell panel is exported is elevated to 200 volts to more than 400 volts.So, can combining inverter be sent in the directly parallel connection of output of circuit.And, because circuit can accurately be controlled the power output of each piece solar panel and the output voltage of circuit, so just can avoid the formation of heat island, can improve the power output 2%-4% of solar panel simultaneously.
But above-mentioned main design problems is: because output voltage is high, the switching loss that causes also increases thereupon.For the PWM system, switching loss is a fixed value.Under the situation of illumination deficiency, the efficient of system will reduce greatly like this.Like the solar panel for a 300W, switching loss is 14W, is merely 4.7%; When 300 watts of output, efficient is 95.3%, is acceptable.But when morning and evening or cloudy day, the power output of solar panel has only 30 watts, and conversion efficiency at this moment drops to 53%.Such system cannot accept.
Therefore, the present invention is just to the booster circuit that boosts based on MPPT that how to utilize that peak power output point follows the tracks of, and guarantees that solar cell system has high conversion rate all the time and the solution of proposition.
Summary of the invention
Based on above-mentioned prior art problem; The present invention proposes a kind of secondary booster circuit that boosts based on MPPT; Utilize super capacitor and charge balancing module, make that the power output behind the secondary booster is stable within a certain period of time, and further utilize super capacitor to pray the effect of stablizing power output;
In addition; The present invention proposes a kind of high performance solar batteries group of boosting based on MPPT; The setting that is connected of a plurality of solar battery group through the parallel connection setting and this a plurality of solar battery group and the secondary booster circuit that boosts based on MPPT; Realize the quantity of control booster circuit output phase, change the size of switching loss, thereby guarantee that circuit has the high performance solar batteries group of high conversion rate all the time.
A kind of secondary booster circuit that boosts based on MPPT that the present invention proposes, this circuit comprise MPPT boost module, charge balancing module, two super capacitors with controller, and two secondary booster modules,
The MPPT boost module has two-way output, and one the tunnel through the charge balancing module, one tunnel uncharged balance module; Power output is respectively P1; P2 distributes power output through controller, the average output power P0 of solar panel equal P1 mean value and P2 mean value with; Connect the parallel connection then of secondary booster circuit after the P1, P2 respectively, power output is constant to be Pout=P1+P2 ≠ P0, and wherein the enable signal CON3 of MPPT booster circuit comes self-controller;
Charge balancing module, the voltage that guarantees each super capacitor are no more than maximum withstand voltage, and guarantee that each super capacitor voltage is identical to obtain the ceiling voltage that P2 is ordered; Represent the charge balancing module to be in for the signal CON1 of MPPT circuit when the charge balancing module and wait for solicited status request; The charge balancing module represents charge balancing ready state ready for the signal CON2 of secondary booster circuit;
Super capacitor EDLC as energy-storage travelling wave tube, plays and is stablizing the effect of power output;
Controller, it imports one the tunnel is first reference voltage Vref 1, another road P0 is then produced by the MPPT booster circuit; Two-way calculates reference voltage two Vref2 as the input parameter of controller, and the power output that is used for the second road secondary booster circuit is calculated, and guarantees that power output is constant in the certain hour; When P1=P0; The charge balancing module will be opened automatically, be used for mending electricity, guarantee that the power output behind the secondary booster is constant; Controller is through communication interface, and the incoming communication bus is connected with remote terminal;
The secondary booster circuit: its input signal one tunnel directly by the output of MPPT booster circuit, through the common electrical capacitor filter, directly connects the secondary booster circuit; Another road is then through charge balancing circuit and super capacitor EDLC, and output connects the secondary booster circuit; Input voltage is first, second reference voltage Vref 1, and Vref2 is used for confirming the value of P1 and P2, and wherein Vref2 is calculated by controller, and after the output-parallel, the short time, interior power output was constant, i.e. Pout=P1+P2.
The distributed solar energy battery pack of the secondary booster circuit that boosts based on MPPT; Comprise a plurality of solar battery group, front-end circuit, inverter, electric power networks module power grid; It is characterized in that said solar battery group is for by the single solar panel of N (11 ~ 1n) battery pack that are formed in parallel; Said battery pack all connects a secondary booster circuit based on the MPPT booster circuit as front-end circuit,
The said secondary booster circuit that boosts based on MPPT as front-end circuit comprises:
The MPPT boost module has two-way output, and one the tunnel through the charge balancing module, one tunnel uncharged balance module; Power output is respectively P1; P2 distributes power output through controller, the average output power P0 of solar panel equal P1 mean value and P2 mean value with; Connect the parallel connection then of secondary booster circuit after the P1, P2 respectively, power output is constant to be Pout=P1+P2 ≠ P0, and wherein the enable signal CON3 of MPPT booster circuit comes self-controller;
Charge balancing module, the voltage that guarantees each super capacitor are no more than maximum withstand voltage, and guarantee that each super capacitor voltage is identical to obtain the ceiling voltage that P2 is ordered; Represent the charge balancing module to be in for the signal CON1 of MPPT circuit when the charge balancing module and wait for solicited status request; The charge balancing module represents charge balancing ready state ready for the signal CON2 of secondary booster circuit;
Super capacitor EDLC as energy-storage travelling wave tube, plays and is stablizing the effect of power output;
Controller, it imports one the tunnel is first reference voltage Vref 1, another road P0 is then produced by the MPPT booster circuit; Two-way calculates reference voltage two Vref2 as the input parameter of controller, and the power output that is used for the second road secondary booster circuit is calculated, and guarantees that power output is constant in the certain hour; When P1=P0; The charge balancing module will be opened automatically, be used for mending electricity, guarantee that the power output behind the secondary booster is constant; Controller is through communication interface, and the incoming communication bus is connected with remote terminal;
The secondary booster circuit: its input signal one tunnel directly by the output of MPPT booster circuit, through the common electrical capacitor filter, directly connects the secondary booster circuit; Another road is then through charge balancing circuit and super capacitor EDLC, and output connects the secondary booster circuit; Input voltage is first, second reference voltage Vref 1, and Vref2 is used for confirming the value of P1 and P2, and wherein Vref2 is calculated by controller, and after the output-parallel, the short time, interior power output was constant, i.e. Pout=P1+P2;
Said solar battery group also comprises aerial lug 5 and communication bus;
Wherein, each cell panel 11 ~ 1n is respectively by a front-end circuit parallelly connected with it, and secondary booster circuit 21 ~ 2n control of promptly boosting based on MPPT by aerial lug 5 controls, is carried out freely connecting through communication bus simultaneously; Parallel battery output is aggregated on the power bus, and power bus is anodal to be connected the both positive and negative polarity of inverter 3 respectively with the power bus negative pole, passes through inverter 3 again and is connected with electric power networks power grid4.
Compared with prior art, the present invention can eliminate the original puncture that causes owing to tropical island effect of solar panel, can guarantee the high-effect generating of solar battery group simultaneously again.
Description of drawings
Fig. 1 is the solar cell winding method schematic diagram of cascaded structure of the prior art;
Fig. 2 is the high performance solar batteries winding method schematic diagram of the secondary booster circuit that boosts based on MPPT of the present invention;
Fig. 3 is the block diagram as the secondary booster circuit that boosts based on MPPT of distributed solar energy battery front-end circuit.
Embodiment
The special circuit that The present invention be directed to the special applications of solar power system and design.
The parallelly connected solar battery group that the present invention adopts, it is following to connect method:
A MPPT of parallel connection boosts on the battery pack that the secondary booster circuit that boosts based on position MPPT of the present invention is formed in parallel by N single solar panel 11 ~ 1n as the distributed solar energy battery pack of front-end circuit, each solar panel of this solar battery group secondary booster circuit 21 ~ 2n, inverter 3, electric power networks module power grid, aerial lug 5 is formed with communication bus.Wherein, each cell panel 11 ~ 1n by secondary booster circuit a 21 ~ 2n control of based on MPPT boosting parallelly connected with it, by aerial lug (Remote Terminal) 5 controls, carries out freely connecting through communication bus respectively simultaneously; Parallel battery output is aggregated on the power bus, and power bus is anodal to be connected the both positive and negative polarity of inverter 3 respectively with the power bus negative pole, passes through inverter 3 again and is connected with electric power networks (power grid) 4.
This advantage that connects method is: single solar panel is removed because of breaking down, can be very not big to the generated output influence of whole system.
As shown in Figure 3, be the analog front circuit block diagram of distributed solar energy battery pack of the present invention, its operation principle is:
1, the structure of front-end circuit explanation: the MPPT booster circuit has two-way output; One the tunnel has the charge balancing module; One the tunnel does not have the charge balancing module, and power output is respectively P1, P2; Through controller power output is distributed, in the certain hour average output power P0 of solar panel equal P1 mean value and P2 mean value and; Connect the parallel connection then of secondary booster circuit after the P1, P2 respectively, power output is constant in the certain hour, Pout=P1+P2 ≠ P0;
2, the legend of front-end circuit: CON3 is the enable signal of MPPT booster circuit; CON2 is the signal that the charge balancing module is given the secondary booster circuit, represents charge balancing ready; CON1 is the signal that the charge balancing module is given the MPPT circuit, represents charge balancing request;
3, charge balancing module: it is maximum withstand voltage that its function is that the voltage that guarantees each electric capacity is no more than, and guarantee that each capacitance voltage is identical to obtain the ceiling voltage that P2 is ordered;
EDLC (super capacitor): its life-span is shorter than common electric capacity, is not suitable for doing filter capacitor, so the secondary booster circuit is divided into two-way, wherein one the tunnel directly by the output of MPPT booster circuit, through the common electrical capacitor filter, directly connects the secondary booster circuit; Another road is then through charge balancing circuit and EDLC, and output connects the secondary booster circuit, and EDLC plays the effect of stablizing power output within a certain period of time as energy-storage travelling wave tube here;
4, controller: Vref1, P0 is produced by the MPPT booster circuit, is used to calculate Vref2 as the input parameter of controller; The power output that is used for the second road secondary booster circuit is calculated; Guarantee that power output is constant in the certain hour, when P1=P0, the charge balancing module will be opened automatically; Be used for mending electricity, guarantee that the power output behind the secondary booster is constant; Controller is through communication interface, and the incoming communication bus is connected with remote terminal;
5, secondary booster circuit: input voltage is with reference to Vref1, and Vref2 is used for confirming the value of P1 and P2, and wherein Vref2 is calculated by controller, and after the output-parallel, the short time, interior power output was constant, i.e. Pout=P1+P2.
Claims (2)
1. secondary booster circuit that boosts based on MPPT, this circuit comprise that MPPT boost module, charge balancing module, two super capacitors with controller, and two secondary booster modules, is characterized in that,
The MPPT boost module has two-way output, and one the tunnel through the charge balancing module, one tunnel uncharged balance module; Power output is respectively P1; P2 distributes power output through controller, the average output power P0 of solar panel equal P1 mean value and P2 mean value with; Connect the parallel connection then of secondary booster circuit after the P1, P2 respectively, power output is constant to be Pout=P1+P2 ≠ P0, and wherein the enable signal CON3 of MPPT booster circuit comes self-controller;
Charge balancing module, the voltage that guarantees each super capacitor are no more than maximum withstand voltage, and guarantee that each super capacitor voltage is identical to obtain the ceiling voltage that P2 is ordered; Represent the charge balancing module to be in for the signal CON1 of MPPT circuit when the charge balancing module and wait for solicited status request; The charge balancing module represents charge balancing ready state ready for the signal CON2 of secondary booster circuit;
Super capacitor EDLC as energy-storage travelling wave tube, plays and is stablizing the effect of power output;
Controller, it imports one the tunnel is first reference voltage Vref 1, another road P0 is then produced by the MPPT booster circuit; Two-way calculates reference voltage two Vref2 as the input parameter of controller, and the power output that is used for the second road secondary booster circuit is calculated, and guarantees that power output is constant in the certain hour; When P1=P0; The charge balancing module will be opened automatically, be used for mending electricity, guarantee that the power output behind the secondary booster is constant; Controller is through communication interface, and the incoming communication bus is connected with remote terminal;
The secondary booster circuit: its input signal one tunnel directly by the output of MPPT booster circuit, through the common electrical capacitor filter, directly connects the secondary booster circuit; Another road is then through charge balancing circuit and super capacitor EDLC, and output connects the secondary booster circuit; Input voltage is first, second reference voltage Vref 1, and Vref2 is used for confirming the value of P1 and P2, and wherein Vref2 is calculated by controller, and after the output-parallel, the short time, interior power output was constant, i.e. Pout=P1+P2.
2. utilize the distributed solar energy battery pack of the described secondary booster circuit that boosts based on MPPT of claim 1; Comprise a plurality of solar battery group, front-end circuit, inverter, electric power networks module power grid; It is characterized in that said solar battery group is the battery pack by the single solar panel (11) of N～(1n) be formed in parallel; Said battery pack all connects a secondary booster circuit based on the MPPT booster circuit as front-end circuit,
The said secondary booster circuit that boosts based on MPPT as front-end circuit comprises:
The MPPT boost module has two-way output, and one the tunnel through the charge balancing module, one tunnel uncharged balance module; Power output is respectively P1; P2 distributes power output through controller, the average output power P0 of solar panel equal P1 mean value and P2 mean value with; Connect the parallel connection then of secondary booster circuit after the P1, P2 respectively, power output is constant to be Pout=P1+P2 ≠ P0, and wherein the enable signal CON3 of MPPT booster circuit comes self-controller;
Charge balancing module, the voltage that guarantees each super capacitor are no more than maximum withstand voltage, and guarantee that each super capacitor voltage is identical to obtain the ceiling voltage that P2 is ordered; Represent the charge balancing module to be in for the signal CON1 of MPPT circuit when the charge balancing module and wait for solicited status request; The charge balancing module represents charge balancing ready state ready for the signal CON2 of secondary booster circuit;
Super capacitor EDLC as energy-storage travelling wave tube, plays and is stablizing the effect of power output;
Controller, it imports one the tunnel is first reference voltage Vref 1, another road P0 is then produced by the MPPT booster circuit; Two-way calculates reference voltage two Vref2 as the input parameter of controller, and the power output that is used for the second road secondary booster circuit is calculated, and guarantees that power output is constant in the certain hour; When P1=P0; The charge balancing module will be opened automatically, be used for mending electricity, guarantee that the power output behind the secondary booster is constant; Controller is through communication interface, and the incoming communication bus is connected with remote terminal;
The secondary booster circuit: its input signal one tunnel directly by the output of MPPT booster circuit, through the common electrical capacitor filter, directly connects the secondary booster circuit; Another road is then through charge balancing circuit and super capacitor EDLC, and output connects the secondary booster circuit; Input voltage is first, second reference voltage Vref 1, and Vref2 is used for confirming the value of P1 and P2, and wherein Vref2 is calculated by controller, and after the output-parallel, the short time, interior power output was constant, i.e. Pout=P1+P2;
Said solar battery group also comprises aerial lug (5) and communication bus;
Wherein, each cell panel (11)～(1n) by a MPPT parallelly connected with it (21)～(2n) control of boosting, simultaneously by aerial lug (5) control, carries out freely connecting through communication bus respectively; Parallel battery output is aggregated on the power bus, and power bus is anodal to be connected the both positive and negative polarity of inverter (3) respectively with the power bus negative pole, passes through inverter (3) again and is connected with electric power networks power grid (4).
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| CN103034203A (en) * | 2012-12-12 | 2013-04-10 | 常州大学 | Flexible intelligent controller capable of removing series solar cell heat island effect |
| CN103895527A (en) * | 2012-12-24 | 2014-07-02 | 现代自动车株式会社 | Boost control method and system for boost converter |
| WO2018153298A1 (en) * | 2017-02-22 | 2018-08-30 | 东汉新能源汽车技术有限公司 | Distributed mppt solar charging system and solar car |
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