CN103218006A - Novel maximum power point tracking (MPPT) control method based on Boost-type convertor - Google Patents
Novel maximum power point tracking (MPPT) control method based on Boost-type convertor Download PDFInfo
- Publication number
- CN103218006A CN103218006A CN2013101484498A CN201310148449A CN103218006A CN 103218006 A CN103218006 A CN 103218006A CN 2013101484498 A CN2013101484498 A CN 2013101484498A CN 201310148449 A CN201310148449 A CN 201310148449A CN 103218006 A CN103218006 A CN 103218006A
- Authority
- CN
- China
- Prior art keywords
- boost
- maximum power
- power point
- mppt
- control method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Control Of Electrical Variables (AREA)
Abstract
The invention provides a novel maximum power point tracking (MPPT) control method based on a Boost-type convertor. According to the novel MPPT control method, the relationship between voltage gains of the Boost-type convertor and the duty ratio is used for deducing the relationship between the input voltage, at the maximum power point, of the Boost-type convertor and the duty ratio, and the maximum power point output by a photovoltaic cell is tracked on the basis of the relationship between the input voltage, at the maximum power point, of the Boost-type convertor and the duty ratio. Compared with a traditional MPPT method, a current sampling circuit is eliminated in the novel MPPT control method, tracking is faster and more stable, and therefore photovoltaic power generation efficiency can be effectively improved, and complexity and cost of a system can also be lowered.
Description
Technical field
The present invention relates to a kind of maximum power point tracing method, belong to technical field of new energies, particularly the solar energy generation technology field based on the Boost quasi-converter.
Background technology
Photovoltaic generating system partly is made up of photovoltaic cell, photovoltaic charger, accumulator etc.By the photovoltaic cell Output Characteristic as can be known, the output of photovoltaic cell is a kind of nonlinear direct supply, and its I-V curve is non-linear, and can change along with the variation of extraneous natural conditions (temperature, intensity of illumination).When the operating voltage of photovoltaic cell changed, its output power also can change.If will improve the energy conversion efficiency of photovoltaic generating system, just must grasp the characteristic of this non-linear power, under the certain situation of temperature and intensity of illumination, there is maximum power point (mpp) in photovoltaic cell, seek the maximum power point of photovoltaic cell, output power just must adopt MPPT maximum power point tracking (MPPT) technology to greatest extent.
Study at present and use more MPPT maximum power point tracking algorithm thanks for your hospitality moving observation method (Perturb﹠Observe, P﹠O) and the conductance increment method (Incremental Conductance, INC).All there is the shortcoming of oneself in these two kinds of methods: disturbance can not stop after adopting the disturbance observation method to reach the maximum power point place, therefore has oscillatory occurences, and tracing step can not be taken into account speed and precision simultaneously, and it is disconnected that erroneous judgement may take place when illumination changes; There is the contradiction of speed and precision in the conductance increment method, and algorithm is had relatively high expectations to the sampling hardware circuit.These two kinds of methods all need current sampling circuit, have increased the complexity of the cost and the algorithm of system.
Because boosting and the load regulation effect of Boost quasi-converter is adapted at carrying out in the photovoltaic generating system maximal power tracing, therefore the Boost quasi-converter is used widely in photovoltaic generating system.At the voltage gain of Boost quasi-converter and the relation of dutycycle, the present invention proposes a kind of new maximal power tracing algorithm, this method only need be sampled to Boost quasi-converter input voltage, saved current sampling circuit, sample circuit is simple, and tracking velocity is fast, stability is high.
Summary of the invention
The present invention is on the basis of traditional MPPT maximum power point tracking algorithm, relation in conjunction with Boost quasi-converter voltage gain and dutycycle, a kind of novel MPPT control method based on the Boost quasi-converter is proposed, this method only need be sampled to Boost quasi-converter input voltage, saved current sampling circuit, sample circuit is simple.Fast, the stable height of this method tracking velocity, good reliability, good economy performance.
The novel MPPT control method that the present invention proposes based on the Boost quasi-converter, the controlled step feature of this technical method is as follows:
Step 1: twice Boost quasi-converter input terminal voltage calculates its difference DELTA v before and after the sampling
p, obtain double sampling transducer dutycycle constantly from DSP simultaneously and calculate its duty ratio Δ D.
Step 2: calculate
Value.
Step 3: determine the change direction of dutycycle according to the value of Q, when Q>0, dutycycle increases Δ d; When Q<0, dutycycle reduces Δ d.
Description of drawings
Fig. 1 is an algorithm flow chart of the present invention.
Fig. 2 is the photovoltaic cell output characteristic curve.
Fig. 3 is the control structure figure of system of no current sensor of the present invention.
V among Fig. 1
p(k), D (k) is respectively input voltage, the dutycycle of current sampling instant Boost quasi-converter, v
p(k-1), D (k-1) is respectively input voltage, the dutycycle of previous sampling instant Boost quasi-converter, D (k+1) is the dutycycle after upgrading; P among Fig. 2
Pv, V
PvBe respectively the output power and the output voltage of photovoltaic cell, MPP is a maximum power point, P
m, V
mBe respectively the output power and the output voltage of maximum power point place photovoltaic cell.PV is a photovoltaic cell among Fig. 3, v
pIt is the input of Boost quasi-converter.
Embodiment
The output power of Boost quasi-converter:
P
oBe the output power of Boost quasi-converter, V
oBe the output voltage of Boost quasi-converter, R is the outgoing side load.When system reaches maximum power point.According to Fig. 2 dP as can be known
Pv/ dV
Pv=0, can derive at the transducer outgoing side also has dP
o/ dV
o=0.Promptly the rate of change of locating output power at maximum power point (MPP) is tending towards 0.To formula dP
o/ dV
o=0 carries out conversion, and both sides are with multiply by (dV
o/ dt), just can obtain formula (2).
Formula (1) and formula (2) are carried out simultaneous, can solve
Because at maximum power point R and V
oAll be not equal to 0, so formula (3) just can abbreviation be
The voltage gain of common Boost transducer is:
The voltage gain of high-gain crisscross parallel Boost transducer is:
Formula (5) and formula (6) difference substitution formula (4) can be got:
Can get by formula (7) and formula (8):
Formula (9) just is based on the basis for estimation of Boost quasi-converter MPPT maximum power point tracking.When the photovoltaic cell duty was in maximum power point output, Boost quasi-converter input voltage and dutycycle satisfied the mathematical relation of formula (9), and Q>0 when photovoltaic cell is operated in the maximum power point left side needs to increase duty and recently follows the tracks of maximum power point; Q when photovoltaic cell is operated in the maximum power point right side<0 need reduce duty and recently follow the tracks of maximum power point.
Claims (1)
1. novel MPPT control method based on the Boost quasi-converter, it is characterized in that utilizing the relation derivation of Boost quasi-converter voltage gain and dutycycle to go out the relation of maximum power point Boost quasi-converter input voltage and dutycycle, this algorithm only need be to the output voltage v of photovoltaic cell
pSample, calculate v then
pIncrement Delta v
pWith the increment Delta D of dutycycle, calculate then
Value, if Q>0, dutycycle increases Δ d, if Q<0 o'clock, dutycycle reduces Δ d, so circulation is carried out, and reaches the purpose of following the tracks of maximum power point.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2013101484498A CN103218006A (en) | 2013-04-23 | 2013-04-23 | Novel maximum power point tracking (MPPT) control method based on Boost-type convertor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2013101484498A CN103218006A (en) | 2013-04-23 | 2013-04-23 | Novel maximum power point tracking (MPPT) control method based on Boost-type convertor |
Publications (1)
Publication Number | Publication Date |
---|---|
CN103218006A true CN103218006A (en) | 2013-07-24 |
Family
ID=48815902
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN2013101484498A Pending CN103218006A (en) | 2013-04-23 | 2013-04-23 | Novel maximum power point tracking (MPPT) control method based on Boost-type convertor |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN103218006A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103995561A (en) * | 2014-05-28 | 2014-08-20 | 华为技术有限公司 | Maximum power point tracing method and device |
CN109032238A (en) * | 2018-07-27 | 2018-12-18 | 西交利物浦大学 | Maximum electric power tracking based on Current Sensorless |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101651436A (en) * | 2009-09-16 | 2010-02-17 | 合肥阳光电源有限公司 | High-precision maximum power point tracing method |
US20110001360A1 (en) * | 2009-07-02 | 2011-01-06 | Stmicroelectrics S.R.L. | Analog mppt circuit for photovoltaic power plant |
CN202231648U (en) * | 2011-10-11 | 2012-05-23 | 上海理工大学 | Maximum power tracking device of photovoltaic cell |
CN103034278A (en) * | 2012-12-11 | 2013-04-10 | 易霸科技(威海)股份有限公司 | Method for realizing simulation circuit based on double linear approximate value MPPT (Maximum Power Point Tracking) algorithm |
-
2013
- 2013-04-23 CN CN2013101484498A patent/CN103218006A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110001360A1 (en) * | 2009-07-02 | 2011-01-06 | Stmicroelectrics S.R.L. | Analog mppt circuit for photovoltaic power plant |
CN101651436A (en) * | 2009-09-16 | 2010-02-17 | 合肥阳光电源有限公司 | High-precision maximum power point tracing method |
CN202231648U (en) * | 2011-10-11 | 2012-05-23 | 上海理工大学 | Maximum power tracking device of photovoltaic cell |
CN103034278A (en) * | 2012-12-11 | 2013-04-10 | 易霸科技(威海)股份有限公司 | Method for realizing simulation circuit based on double linear approximate value MPPT (Maximum Power Point Tracking) algorithm |
Non-Patent Citations (1)
Title |
---|
潘雷雷,李国丽,胡存刚: "新型占空比直接控制的光伏MPPT研究", 《电气传动》, vol. 41, no. 7, 31 July 2011 (2011-07-31), pages 24 - 29 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103995561A (en) * | 2014-05-28 | 2014-08-20 | 华为技术有限公司 | Maximum power point tracing method and device |
CN103995561B (en) * | 2014-05-28 | 2015-12-02 | 华为技术有限公司 | A kind of maximum power point tracing method and device |
CN109032238A (en) * | 2018-07-27 | 2018-12-18 | 西交利物浦大学 | Maximum electric power tracking based on Current Sensorless |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101604848B (en) | Modified fuzzy sliding mode controlling method of monopole three-phase photovoltaic grid-connected system | |
Liu et al. | A novel photovoltaic system control strategies for improving hill climbing algorithm efficiencies in consideration of radian and load effect | |
Thangavelu et al. | Linear open circuit voltage‐variable step‐size‐incremental conductance strategy‐based hybrid MPPT controller for remote power applications | |
CN102411396B (en) | Method and arrangement for tracking maximum power point of photovoltaic module | |
CN103944193B (en) | A kind of modularization photovoltaic combining inverter parallel control system and method | |
CN103488239A (en) | Tracking method for maximum power point in photovoltaic grid-connected inverter | |
CN107992153A (en) | A kind of photovoltaic maximum power point-tracing control method | |
CN103019293B (en) | Maximum power point tracking method for rapidly self-adapting step length of photovoltaic array | |
CN102231534B (en) | Two-stage single-phase photovoltaic grid-connected system and control method thereof adopting DC side voltage sensor-free control strategy | |
CN102736661A (en) | MPPT control method in novel photovoltaic system | |
CN101877559A (en) | Compound control method for fast and accurate tracking control of maximum power point of photovoltaic power generation system | |
CN105116958B (en) | Photovoltaic array adaptive step disturbance observational method MPPT control method and system | |
CN104035476A (en) | Maximum power point tracing method based on output voltage stepped frequency disturbance | |
CN104104112A (en) | MPPT control method for photovoltaic grid-connected inverter of two-stage topology | |
Asim et al. | An improved constant voltage based MPPT technique for PMDC motor | |
Farhat et al. | Real-time efficiency boosting for PV systems using MPPT based on sliding mode | |
Kumar et al. | Maximum power point tracking using perturbation and observation as well as incremental conductance algorithm | |
CN101692599B (en) | Impedance matching control (IMC) method of maximum power point tracking (MPPT) for photovoltaic power generation system | |
CN103218006A (en) | Novel maximum power point tracking (MPPT) control method based on Boost-type convertor | |
CN107544610B (en) | A kind of photovoltaic MPPT control method based on MPP voltage regulation and gradient search | |
Tauseef et al. | A simple and cost effective maximum power point tracker for PV arrays employing a novel constant voltage technique | |
CN102637056B (en) | Method for maintaining maximum power point of photovoltaic power generation system | |
CN103197720A (en) | Novel MPPT (maximum power point tracking) control method based on flyback converter | |
CN103257667A (en) | Maximum power point tracking technology of photovoltaic system | |
CN103279164A (en) | Novel MPPT control method based on Buck class converters |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130724 |