CN202334369U - Photovoltaic electrical energy optimizer - Google Patents
Photovoltaic electrical energy optimizer Download PDFInfo
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- CN202334369U CN202334369U CN2011203963188U CN201120396318U CN202334369U CN 202334369 U CN202334369 U CN 202334369U CN 2011203963188 U CN2011203963188 U CN 2011203963188U CN 201120396318 U CN201120396318 U CN 201120396318U CN 202334369 U CN202334369 U CN 202334369U
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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
Abstract
The utility model discloses a photovoltaic electrical energy optimizer, which is mainly composed of a photovoltaic module, a first capacitor, a conversion module, a maximum power point (MPP) tracking control module and a second capacitor, wherein the photovoltaic module is used for converting solar energy into direct-current energy; the first capacitor is coupled to the photovoltaic module and used for filtering the direct-current energy; the conversion module is coupled to the first capacitor and used for converting output power of the photovoltaic module to generate maximum power; the MPP tracking control module is coupled to the conversion module and used for tracking and controlling output of the maximum power; and the second capacitor is coupled to the conversion module and used for stabilizing output voltage of the conversion module. The photovoltaic electrical energy optimizer disclosed by the utility model is capable of effectively tracking a MPP to obtain extra electrical energy when an external environment is dramatically changed or a solar battery panel is shielded.
Description
Technical field
The utility model relates to a kind of photovoltaic generating system, relates in particular to a kind of photovoltaic electric energy optimizing device that is applicable to photovoltaic generation.
Background technology
Serious day by day along with world today's energy crisis and environmental pollution, solar energy with its noiseless, pollution-free, energy is available anywhere etc., and advantage more and more comes into one's own.But because cost for solar power generation is higher, in recent years, the research that the researcher mainly is devoted to improve photovoltaic system stability and transformation efficiency, reduces cost.
As everyone knows, under different illumination intensity and ambient temperature, the output current-voltage of photovoltaic module (I-V) and power-voltage (P-V) have nonlinear characteristic; Photovoltaic module is when a certain output voltage values, and its power output just can reach maximum, and working point at this moment is called maximum power point (maximum power point is called for short MPP).Therefore; Improve the whole efficiency of photovoltaic generating system, an important approach is exactly to adjust the working point of photovoltaic module in real time, makes it to always work near the maximum power point; This process just is MPPT maximum power point tracking (maximum power point tracking is called for short MPPT).
The electric energy optimizing device is installed in independent running on each photovoltaic module, but the MPPT of every photovoltaic module of individual processing guarantees the operation of photovoltaic module safe and continuous ground.The Hardware Response Delay speed of prior art is slow; Under stable situation; Can cause the real work point of photovoltaic module near MPP, to vibrate, cause power loss, in the influence of noise, measure error and digital control quantization error; Particularly external environment changes when violent, and existing electric energy optimizing device also can't be avoided near the vibration the maximum power point.
The utility model content
This utility model technical problem to be solved is to provide a kind of to extraneous intensity of illumination or temperature jump, and during the photovoltaic module partial occlusion, is used to control the photovoltaic electric energy optimizing device of the Maximum Power Output point of photovoltaic module.
In order to solve the problems of the technologies described above, the invention provides a kind of photovoltaic electric energy optimizing device, this photovoltaic electric energy optimizing device comprises: photovoltaic module, it is a direct current energy with conversion of solar energy; First electric capacity, it is coupled to said photovoltaic module, and said direct current energy is carried out filtering; Modular converter, it is coupled to said first electric capacity, and the power output of changing said photovoltaic module is to generate maximum power; The MPPT maximum power point tracking control module, it is coupled to said modular converter, the output of the said maximum power of tracking Control; And second electric capacity, it is coupled to said modular converter, stablizes the output voltage of said modular converter.
According to one embodiment of present invention, also comprise energy-storage module, it is coupled to said second electric capacity, and the output DC of said modular converter can be stored.
According to one embodiment of present invention, said photovoltaic module comprises the string and/or the parallel-connection structure of single solar energy photovoltaic panel or a plurality of solar energy photovoltaic panels.
According to one embodiment of present invention, said modular converter is the booster circuit that comprises integrated switch element, capacitor, inductor, fly-wheel diode.
Compared with prior art, the utlity model has following advantage: violent or solar panel has when covering to the utility model photovoltaic electric energy optimizing device in extraneous environmental change, can follow the tracks of MPP effectively; Obtain additional electric energy; Improve the steady-state behaviour of MPPT control, and avoid near the vibration the maximum power point, promoted the performance of modular converter; Can handle the situation of the unnecessary energy, also can handle the situation that the energy reduces.Can be widely used in the actual light photovoltaic generating system, have high-adaptability, robustness and validity.
Further feature of the utility model and advantage will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through implementing the utility model.The purpose of the utility model can realize through the structure that in specification, claims and accompanying drawing, is particularly pointed out and obtain with other advantages.
Though will combine certain exemplary to implement to describe the utility model hereinafter, and it will be appreciated by those skilled in the art that to not being intended to the utility model is limited to these embodiment.Otherwise, be intended to cover the spirit and interior all substitutes, correction and the equivalent of scope that are included in the defined the utility model of appending claims.
Description of drawings
Accompanying drawing is used to provide the further understanding to the utility model, and constitutes the part of specification, is used to explain the utility model with the embodiment of the utility model, does not constitute the restriction to the utility model.In the accompanying drawings:
Fig. 1 is the structural representation according to the photovoltaic electric energy optimizing device of the utility model;
Fig. 2 is the structural representation according to the MPPT maximum power point tracking control module of the electric energy optimizing device of the utility model first embodiment;
Fig. 3 is the structural representation according to the MPPT maximum power point tracking control module of the electric energy optimizing device of the utility model second embodiment;
Fig. 4 is the contrast simulation sketch map that adopts existing photovoltaic electric energy optimizing device and the utility model first embodiment respectively;
Fig. 5 adopts the test result sketch map of the utility model first embodiment in the model machine of 200W photovoltaic generating system laboratory;
Fig. 6 is that employing the utility model first embodiment is 0.02 o'clock test result sketch map at error threshold;
Fig. 7 is when the intensity of illumination cycle changes, and adopts the test result sketch map of the utility model first embodiment;
Fig. 8 is when the intensity of illumination acute variation, adopts the emulation sketch map of existing photovoltaic electric energy optimizing device and the utility model second embodiment;
Fig. 9 adopts the test result sketch map of the utility model second embodiment in the model machine of 200W photovoltaic generating system laboratory;
Figure 10 is the control efficiency sketch map that adopts the utility model second embodiment.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, the utility model is done to specify further below in conjunction with accompanying drawing.
Fig. 1 is the structural representation according to the utility model photovoltaic electric energy optimizing device, and is as shown in Figure 1, and photovoltaic electric energy optimizing device comprises photovoltaic module 101, modular converter 102, MPPT maximum power point tracking control module 103, first electric capacity 104 and second electric capacity 105.Next, each module that is comprised with regard to photovoltaic electric energy optimizing device respectively and the function that possesses thereof are elaborated.
The utility model electric energy optimizing device can also comprise energy-storage module 106, and the output direct current that it is coupled to second electric capacity 105 and stores modular converter 102 can be stored the output DC of modular converter 102.
In sum, violent or solar panel has when covering to the utility model photovoltaic electric energy optimizing device in extraneous environmental change, can follow the tracks of MPP effectively; Obtain additional electric energy; Improve the steady-state behaviour of MPPT control, and avoid near the vibration the maximum power point, promote the performance of modular converter 102; Can handle the situation of the unnecessary energy, also can handle the situation that the energy reduces.
First embodiment
Fig. 2 is the structural representation according to the MPPT maximum power point tracking control module of the utility model first embodiment, and the structure with reference to MPPT maximum power point tracking control module in 2 pairs of present embodiments of figure is elaborated below.
As shown in Figure 2, MPPT maximum power point tracking control module 103 comprises sampling unit 210, slope calculation unit SCU 230, first judging unit 240, second judging unit 250 and reference voltage control unit 260.Next, each unit that is comprised with regard to MPPT maximum power point tracking control module 103 respectively and the function that possesses thereof are elaborated.
In this embodiment; Sampling unit 210; Its output voltage and output current to photovoltaic module 101 is sampled, and with acquisition output voltage and output current, and calculates voltage variety and the current change quantity in the Preset Time section; For example, through 10 A/D converters the output voltage and the output current of photovoltaic module 101 are sampled.
For example; With one-period as the Preset Time section; The output voltage of the output voltage of k periodic sampling gained photovoltaic module 101 and k-1 cycle photovoltaic module is carried out difference calculate voltage variety; The output current of the output current of k cycle gained photovoltaic module and k-1 cycle gained photovoltaic module is carried out difference calculate current change quantity, wherein k is an integer.
Slope calculation unit SCU 230, it is coupled to sampling unit 210 and receives output voltage, output current, voltage variety and the current change quantity that sampling unit 210 is obtained, and calculates the slope H of power output-voltage curve.
Reference voltage control unit 260; It is coupled to first judging unit 240; When first judging unit 240 is judged as slope greater than preset error threshold, receive the data of slope, change the value of the reference voltage of photovoltaic electric energy optimizing through the sign symbol of judging slope.
Need to prove; Realize the tracking of maximum power through the size of control reference voltage level; For example begin reference voltage level and be set to 0, reach final perfect condition through constantly changing with control, desirable reference voltage is the corresponding desired voltage values of photovoltaic module maximum power point.
In sum, the MPPT maximum power point tracking control module 103 of present embodiment is recently carried out the maximum power point control through the control switch duty, both can more easily in practical application, realize, can follow the tracks of fast again and the stable maximum power point that accurately obtains.
Second embodiment
Fig. 3 is according to the structural representation of the MPPT maximum power point tracking control module of the utility model second embodiment, with reference to accompanying drawing present embodiment is elaborated below.
For the ease of explanation, no longer the structure identical with previous embodiment launched in detail, and only stressed the difference with previous embodiment.In Fig. 3, to having adopted identical Reference numeral with the same or analogous structure of previous embodiment.
As shown in Figure 3, MPPT maximum power point tracking control module 103 comprises sampling unit 210, the 3rd judging unit 220, slope calculation unit SCU 230, first judging unit 240, second judging unit 250 and reference voltage control unit 260.Next, will the function of the 3rd judging unit 220 be elaborated.
As shown in Figure 3, the 3rd judging unit 220, it is coupled to sampling unit 210 and slope calculation unit SCU 230; When current change quantity was non-vanishing, it received the said voltage variety and the said current change quantity calculated resistance variable quantity of said sampling unit (210) gained, at resistance change during smaller or equal to preset value; Judge whether first output resistance and second output resistance in the said Preset Time section equate; When current change quantity is zero, then photovoltaic module 101 is carried out random disturbances one time, wherein; The output resistance in first output resistance and second output resistance are sampling unit 210 in the Preset Time section two preset moment; For example, first output resistance is a middle output resistance constantly in one-period, and second output resistance is a terminal point output resistance constantly in this cycle.
The emulation experiment effect
Fig. 4 is the contrast simulation sketch map that adopts existing photovoltaic electric energy optimizing device and the utility model first embodiment respectively.Can find out that by figure intensity of illumination changes in time, high intensity of illumination is 1000W/m in the time of 3 seconds to 7 seconds
2, all the other low lights are approximately 60W/m according to intensity
2And the power of the output voltage of photovoltaic module, output current and generation changes along with the variation of intensity of illumination.In existing photovoltaic electric energy optimizing device, the power of photovoltaic module output voltage, output current and generation is periodic swinging.And the photovoltaic electric energy optimizing device of the utility model first embodiment has reduced vibration widely, therefore can follow the tracks of the MPP of photovoltaic module more accurately and stably.
Fig. 5 adopts the test result sketch map of the utility model first embodiment in the model machine of 200W photovoltaic generating system laboratory.This photovoltaic generating system laboratory model machine is the two-stage grid-connected photovoltaic system, and HIP-200BA3 provides electric energy by photovoltaic module, converts direct current photovoltaic electric energy into AC energy through boost converter and full-bridge inverter and offers electrical network.Its hardware circuit mainly is divided into two parts: based on the control circuit and the power circuit of microcontroller.The control cycle of output voltage and output current is 100 μ s, and the MPPT maximum power point tracking control cycle is 50ms.Voltage boosting dc converter switch frequency is 20kHz, and the result is shown in figure 10 in output.Among the figure, passage 1 is system's output voltage; Passage 2 is system's output current; The Math passage is system's power output.
Fig. 6 is that employing the utility model first embodiment is 0.02 o'clock test result sketch map at error threshold.Can obtain, MPPT efficient is about 99.1%.
Fig. 7 is when the intensity of illumination cycle is the 0.8Hz variation, adopts the test result sketch map of the utility model first embodiment.Can find out that equally the photovoltaic electric energy optimizing utensil of the utility model first embodiment has high tracking accuracy.
Fig. 8 is when the intensity of illumination acute variation, adopts the emulation sketch map of existing photovoltaic electric energy optimizing device and the utility model second embodiment.In Matlab, set up a stable state peak power output 5W, open circuit voltage is the photovoltaic module of 25V.During beginning, the systematic steady state operation, when 100ms, extraneous intensity of illumination acute variation is recovered normal when 400ms.Can be clear that by simulation result existing photovoltaic electric energy optimizing device can't trace into the maximum power point output of photovoltaic module when extraneous intensity of illumination acute variation,, will make power output be reduced to zero soon in output loading hour; And after intensity of illumination is recovered normally, dP
PV/ dV
PVRemain zero, can't continue to follow the tracks of the MPP of photovoltaic module.And the photovoltaic electric energy optimizing device of the utility model second embodiment can analyze the variable effect of environment, and what remain valid controls; After external environment changes recovery normally, also can continue to follow the tracks of the maximum power point of photovoltaic module.
Fig. 9 adopts the test result sketch map of the utility model second embodiment in the model machine of 200W photovoltaic generating system laboratory.The laboratory model machine provides electric energy by photovoltaic module HIP-200BA3, carries out MPPT maximum power point tracking through boost converter, and with power storage in storage battery.The voltage and current control cycle is 100 μ s, and the MPPT maximum power point tracking control cycle is 50ms.Voltage boosting dc converter switch frequency is 20kHz, and extraneous intensity of illumination is when the 2s-8s acute variation, and photovoltaic module is as shown in the figure in output voltage and the output current experimental result of the utility model second embodiment.Can find out that the experimental result of the utility model second embodiment is consistent with simulation result.
Figure 10 is the control efficiency sketch map that adopts the utility model second embodiment.Set up a 200W photovoltaic generating system experimental prototype, proved once more through a series of experiments, under the environment that changes, the utility model second embodiment has high robust, and its control precision is about 98.3%.
Each module that it is apparent to those skilled in the art that above-mentioned the utility model can be made into each integrated circuit modules respectively with them, perhaps becomes the single integrated circuit module to realize a plurality of module makings in them.Like this, the utility model is not restricted to any specific combination of hardware.
Though the execution mode that utility model disclosed as above, the execution mode that said content just adopts for the ease of understanding the utility model is not in order to limit the utility model.Technical staff under any the utility model in the technical field; Under the prerequisite of spirit that does not break away from the utility model and disclosed and scope; Can do any modification and variation what implement in form and on the details; But the scope of patent protection of the utility model still must be as the criterion with the scope that appending claims was defined.
Claims (4)
1. a photovoltaic electric energy optimizing device is characterized in that, comprising:
Photovoltaic module (101), it is a direct current energy with conversion of solar energy;
First electric capacity (104), it is coupled to said photovoltaic module (101), and said direct current energy is carried out filtering;
Modular converter (102), it is coupled to said first electric capacity (104), and the power output of changing said photovoltaic module (101) is to generate maximum power;
MPPT maximum power point tracking control module (103), it is coupled to said modular converter (102), the output of the said maximum power of tracking Control; And
Second electric capacity (105), it is coupled to said modular converter (102), stablizes the output voltage of said modular converter (102).
2. photovoltaic electric energy optimizing device according to claim 1 is characterized in that, also comprises
Energy-storage module (106), it is coupled to said second electric capacity (105), and the output DC of said modular converter (102) can be stored.
3. photovoltaic electric energy optimizing device according to claim 1 is characterized in that,
Said photovoltaic module (101) comprises the string and/or the parallel-connection structure of single solar energy photovoltaic panel or a plurality of solar energy photovoltaic panels.
4. photovoltaic electric energy optimizing device according to claim 1 is characterized in that,
Said modular converter (102) is the booster circuit that comprises integrated switch element, capacitor, inductor, fly-wheel diode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203963188U CN202334369U (en) | 2010-12-27 | 2011-10-18 | Photovoltaic electrical energy optimizer |
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| CN201020681600 | 2010-12-27 | ||
| CN201020681600.6 | 2010-12-27 | ||
| CN2011203963188U CN202334369U (en) | 2010-12-27 | 2011-10-18 | Photovoltaic electrical energy optimizer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095179A (en) * | 2013-01-22 | 2013-05-08 | 重庆大学 | Photovoltaic cell array voltage stabilizing device |
| CN103529899A (en) * | 2013-10-17 | 2014-01-22 | 深圳市禾望电气有限公司 | MPPT controller, power tracking device, photovoltaic power generation and energy storage system |
| CN104615190A (en) * | 2015-02-15 | 2015-05-13 | 无锡上能新能源有限公司 | Control method of MPPT (maximum power point tracking) optimizer of photovoltaic power generation system |
| CN114285369A (en) * | 2017-04-21 | 2022-04-05 | 华为数字能源技术有限公司 | Control method and device of solar power supply system |
| CN114402525A (en) * | 2019-09-10 | 2022-04-26 | 索太克创新有限公司 | Photovoltaic optimizer power system supplying power from photovoltaic devices |
-
2011
- 2011-10-18 CN CN2011203963188U patent/CN202334369U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095179A (en) * | 2013-01-22 | 2013-05-08 | 重庆大学 | Photovoltaic cell array voltage stabilizing device |
| CN103095179B (en) * | 2013-01-22 | 2015-10-14 | 重庆大学 | Photovoltaic battery array stable-pressure device |
| CN103529899A (en) * | 2013-10-17 | 2014-01-22 | 深圳市禾望电气有限公司 | MPPT controller, power tracking device, photovoltaic power generation and energy storage system |
| CN103529899B (en) * | 2013-10-17 | 2015-10-21 | 深圳市禾望电气股份有限公司 | MPPT controller, power tracking device, photovoltaic generation and accumulator system |
| CN104615190A (en) * | 2015-02-15 | 2015-05-13 | 无锡上能新能源有限公司 | Control method of MPPT (maximum power point tracking) optimizer of photovoltaic power generation system |
| CN104615190B (en) * | 2015-02-15 | 2017-06-20 | 上能电气股份有限公司 | The control method of MPPT optimizers in a kind of photovoltaic generating system |
| CN114285369A (en) * | 2017-04-21 | 2022-04-05 | 华为数字能源技术有限公司 | Control method and device of solar power supply system |
| US11824496B2 (en) | 2017-04-21 | 2023-11-21 | Huawei Digital Power Technologies Co., Ltd. | Method and apparatus for controlling solar power systems |
| CN114402525A (en) * | 2019-09-10 | 2022-04-26 | 索太克创新有限公司 | Photovoltaic optimizer power system supplying power from photovoltaic devices |
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| 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: 20120711 Termination date: 20161018 |