CN109491443A - The global maximum electric power point-tracking method of line model is referred to based on equivalent voltage - Google Patents

The global maximum electric power point-tracking method of line model is referred to based on equivalent voltage Download PDF

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CN109491443A
CN109491443A CN201811328363.2A CN201811328363A CN109491443A CN 109491443 A CN109491443 A CN 109491443A CN 201811328363 A CN201811328363 A CN 201811328363A CN 109491443 A CN109491443 A CN 109491443A
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line
electric power
power point
voltage
voltage reference
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CN109491443B (en
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李星硕
文辉清
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Xian Jiaotong Liverpool University
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Xian Jiaotong Liverpool University
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power
    • G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
    • 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

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention discloses a kind of global maximum electric power point-tracking methods that line model is referred to based on equivalent voltage, comprising: building equivalent voltage refers to line model, calculates the equivalent voltage reference line of photovoltaic array；Calculate equivalent load lineR pv ；According to the structure of DC-DC current transformer, corresponding control signal d is calculated；Operating point is respectively moved to according to d valuePLWith it is eachR pv Intersection, whenPLWithR pv Intersection not when on I-V curve, operating point is moved toR pv With the intersection of I-V curve；If the operating point after mobile is located on the left of voltage reference lines, corresponding voltage reference lines are excluded；Conversely, retaining corresponding voltage reference lines；Increase the value of PL, repeat step and repeatedly recycled, until retaining a voltage reference lines, which is global maximum electric power point, line trace of going forward side by side.More accurately to reflect the size of crest voltage, accurately global maximum electric power point is obtained.

Description

The global maximum electric power point-tracking method of line model is referred to based on equivalent voltage
Technical field
The present invention relates to a kind of global maximum electric power trackings, are based on equivalent voltage reference line more particularly to one kind The global maximum electric power point-tracking method of model.
Background technique
Solar energy is widely regarded as a kind of very important sustainable energy by the whole world.But due to photovoltaic array by The influence of outside environmental elements such as illumination or temperature, output voltage, electric current show apparent nonlinear characteristic.Therefore how The output power for adjusting photovoltaic module in real time, realizes MPPT maximum power point tracking (maximum power under any external environment Point tracking, MPPT) seem particularly significant.
When partial occlusion occurs for photovoltaic array, it will appear multiple local maximum power point (Local on P-V curve Maximum Power Point, LMPP) and global maximum power point (Global Maximum Power Point, GMPP).At this point, traditional MPPT algorithm may make photovoltaic system work in some LMPP rather than GMPP, so as to cause photovoltaic Array can not export its maximum power.
In order to solve the problems, such as this, many global maximum power point tracking (GMPPT) algorithms are suggested.Wherein, mostly Several algorithm model of the GMPPT algorithm based on 0.8Voc, spacing is 0.8Voc between assuming each peak value, as shown in Figure 1.Often After algorithm finds a peak value, algorithm is movable to the progress of another peak value section by increaseing or decreasing the voltage of 0.8Voc Search finally determines GMPP.But since in practice, spacing is actually not exclusively equal to 0.8Voc between each peak value, therefore, this Model is not accurate enough, and often will cause the erroneous judgement to GMPP or fall into LMPP.
Summary of the invention
In order to solve above-mentioned technical problem, equivalent voltage reference line is based on the purpose of the present invention is to propose to a kind of The global maximum electric power point-tracking method of model.Based on equivalent voltage with reference to line model carry out global maximum electric power point with Track can more accurately reflect the size of crest voltage, obtain accurately global maximum electric power point.
The technical scheme is that
A kind of global maximum electric power point-tracking method referring to line model based on equivalent voltage, comprising the following steps:
S01: building equivalent voltage refers to line model, calculates the equivalent voltage reference line V of photovoltaic arrayref；
S02: equivalent load line R is calculatedpv,PL is power line, is given value；
S03: according to the structure of DC-DC current transformer, corresponding control signal d is calculated；
S04: operating point is respectively moved to by PL and each R according to d valuepvIntersection, as PL and RpvIntersection do not exist When on I-V curve, operating point is moved to RpvWith the intersection of I-V curve；
S05: if the operating point after mobile is located on the left of voltage reference lines, corresponding voltage reference lines are excluded；Instead It, retains corresponding voltage reference lines；
S06: increasing the value of PL, repeats step S02 and is repeatedly recycled, should until retaining a voltage reference lines Voltage reference lines are global maximum electric power point, line trace of going forward side by side.
In preferred technical solution, equivalent voltage reference lines model in the step S01 are as follows:
Vref1...N=Vmpp+(N-1)Vs-(M-N)Vd
Wherein, VmppFor reference voltage at photovoltaic module maximum power point, VdFor the bypass diode pressure drop of photovoltaic module, Vs For linear DC voltage source, M is photovoltaic module sum, and N is n-th photovoltaic module.
In preferred technical solution, in the step S03, DC/DC current transformer uses Boost structure,
Wherein, RloadFor the output resistance of DC-DC current transformer.
In preferred technical solution, using perturbation observation method by stabilization of operating point near global maximum electric power point.
Compared with prior art, the invention has the advantages that
Global maximum electric power point tracking is carried out with reference to line model based on equivalent voltage, can more accurately reflect appearance The size of threshold voltage obtains accurately global maximum electric power point, to realize quick dynamic tracing and avoid erroneous judgement existing As.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and embodiments:
Fig. 1 is the algorithm model schematic diagram based on 0.8Voc；
Fig. 2 is the flow chart the present invention is based on equivalent voltage with reference to the global maximum electric power point-tracking method of line model；
Fig. 3 is the illumination schematic diagram of three photovoltaic modules of the present embodiment；
Fig. 4 is building equivalent voltage reference line model schematic；
Fig. 5 is based on equivalent voltage reference line model schematic；
Fig. 6 is the mobile schematic diagram in operating point；
Fig. 7 is the experimental result the present invention is based on equivalent voltage with reference to the global maximum electric power point-tracking method of line model Figure.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment and join According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair Bright range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid this is unnecessarily obscured The concept of invention.
Embodiment:
As shown in Fig. 2, a kind of global maximum electric power point-tracking method that line model is referred to based on equivalent voltage, including with Lower step:
S01: building equivalent voltage refers to line model, calculates the equivalent voltage reference line V of photovoltaic arrayref；
S02: equivalent load line R is calculatedpv,PL is power line, is given value；
S03: according to the structure of DC-DC current transformer, corresponding control signal d is calculated；
S04: operating point is respectively moved to by PL and each R according to d valuepvIntersection, as PL and RpvIntersection do not exist When on I-V curve, operating point is moved to RpvWith the intersection of I-V curve；
S05: if the operating point after mobile is located on the left of voltage reference lines, corresponding voltage reference lines are excluded；Instead It, retains corresponding voltage reference lines；
S06: increasing the value of PL, repeats step S02 and is repeatedly recycled, should until retaining a voltage reference lines Voltage reference lines are global maximum electric power point, line trace of going forward side by side.
Equivalent voltage proposed by the invention is as shown in Figure 3 with reference to line model.Including photovoltaic group string by three photovoltaic modules A, B, C are formed, and certain photovoltaic module is also connected with DC/DC current transformer (not shown).When partial occlusion occurs for photovoltaic group string, Wherein the illumination of each photovoltaic module is (being simulated by bypass diode) as shown in Figure 2.According to the work feelings of photovoltaic group string Condition, electrical characteristic can be divided into three kinds of situations:
1. when module B and module C is bypassed shorted diode simultaneously, as shown in a left side 1 in Fig. 3, entire photovoltaic group string Electrical characteristic is mainly dominated by modules A, at this time first crest voltage reference value V of photovoltaic group stringref1Are as follows:
Vref1=Vmpp-2Vd (1)
Wherein VmppFor reference voltage at photovoltaic module maximum power point, VdFor the bypass diode pressure drop of photovoltaic module.
2. when only module C is bypassed shorted diode, as shown in centre in Fig. 3, the electrical spy of entire photovoltaic group string Property is mainly dominated by module B, at this time second crest voltage reference value V of photovoltaic group stringref2Are as follows:
Vref2=Vmpp+Vs-Vd (2)
Wherein VsFor linear DC voltage source.
3. be bypassed shorted diode without module, as shown in the right side 1 in Fig. 3, the electrical characteristic master of entire photovoltaic group string It to be dominated by module C, at this time photovoltaic group string third crest voltage reference value Vref3Are as follows:
Vref3=Vmpp+2Vs (3)
As shown in figure 4, accordingly, it is assumed that include M photovoltaic module in photovoltaic group string, each crest voltage is available Following general formula indicates:
Vref1...N=Vmpp+(N-1)Vs-(M-N)Vd (4)
Wherein, N is n-th photovoltaic module or n-th crest voltage.
Line model is referred to according to above-mentioned equivalent voltage, the size of crest voltage more can be accurately calculated, such as Fig. 5 institute Show.
It includes Buck, Boost, Buck-Boost, Sepic and Zeta unsteady flow that topological structure, which is embodied, in DC/DC current transformer The DC/DC current transformer of device, the present embodiment uses Boost structure, corresponding control signal
Wherein, RloadFor the output resistance of DC-DC current transformer.
As shown in Figure 6,7, system, which enters, recycles and is respectively moved to PL and each R according to d valuepvIntersection, i.e. RefA、 RefB、RefC.Due to RefA、RefB、RefCIt is not necessarily located on I-V curve, system operating point can actually be moved to A, B, C point.
After completing the movement of A, B, C point, system can assess system operating point point.If operating point is located at voltage On the left of reference line, such as point A, then circulation will exclude corresponding voltage reference lines next time；, whereas if operating point is located at voltage ginseng It examines on the right side of line, such as point B, point C, then circulation will retain corresponding voltage reference lines next time.
Increase the value of PL, and repeatedly recycled with this, until only one voltage reference lines.At this point, this is unique The voltage reference lines of reservation are GMPP.
Finally use perturbation observation method by stabilization of operating point near GMPP.
It should be understood that above-mentioned specific embodiment of the invention is used only for exemplary illustration or explains of the invention Principle, but not to limit the present invention.Therefore, that is done without departing from the spirit and scope of the present invention is any Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.In addition, appended claims purport of the present invention Covering the whole variations fallen into attached claim scope and boundary or this range and the equivalent form on boundary and is repairing Change example.

Claims (4)

1. it is a kind of based on equivalent voltage refer to line model global maximum electric power point-tracking method, which is characterized in that including with Lower step:
S01: building equivalent voltage refers to line model, calculates the equivalent voltage reference line V of photovoltaic arrayref；
S02: equivalent load line R is calculatedpv,PL is power line, is given value；
S03: according to the structure of DC-DC current transformer, corresponding control signal d is calculated；
S04: operating point is respectively moved to by PL and each R according to d valuepvIntersection, as PL and RpvIntersection not I-V song When on line, operating point is moved to RpvWith the intersection of I-V curve；
S05: if the operating point after mobile is located on the left of voltage reference lines, corresponding voltage reference lines are excluded；Conversely, protecting Stay corresponding voltage reference lines；
S06: increasing the value of PL, repeats step S02 and is repeatedly recycled, until retaining a voltage reference lines, the voltage Reference line is global maximum electric power point, line trace of going forward side by side.
2. the global maximum electric power point-tracking method according to claim 1 that line model is referred to based on equivalent voltage, It is characterized in that, equivalent voltage reference lines model in the step S01 are as follows:
Vref1...N=Vmpp+(N-1)Vs-(M-N)Vd
Wherein, VmppFor reference voltage at photovoltaic module maximum power point, VdFor the bypass diode pressure drop of photovoltaic module, VsFor line Property DC voltage source, M be photovoltaic module sum, N be n-th photovoltaic module.
3. the global maximum electric power point-tracking method according to claim 1 that line model is referred to based on equivalent voltage, It being characterized in that, in the step S03, DC/DC current transformer uses Boost structure,
Wherein, RloadFor the output resistance of DC-DC current transformer.
4. the global maximum electric power point-tracking method according to claim 1 that line model is referred to based on equivalent voltage, Be characterized in that, using perturbation observation method by stabilization of operating point near global maximum electric power point.
CN201811328363.2A 2018-11-09 2018-11-09 Global maximum electric power point tracking method based on equivalent voltage reference line model Active CN109491443B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102158134A (en) * 2011-05-27 2011-08-17 深圳珈伟光伏照明股份有限公司 Peak power tracking method for solar generating system
CN105259972A (en) * 2015-12-02 2016-01-20 河海大学 Multi-peak photovoltaic array maximum power point tracking algorithm based on jump strategy
CN106647921A (en) * 2017-01-19 2017-05-10 南通大学 Improved MPPT algorithm with reduced influence of partial shading on photovoltaic system
CN106919215A (en) * 2017-03-29 2017-07-04 西交利物浦大学 A kind of multi-peak maximum electric power tracking based on power increment method
CN106951023A (en) * 2017-03-22 2017-07-14 西交利物浦大学 A kind of multi-peak maximum electric power tracking and controlling method based on β parameters

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
CN102158134A (en) * 2011-05-27 2011-08-17 深圳珈伟光伏照明股份有限公司 Peak power tracking method for solar generating system
CN105259972A (en) * 2015-12-02 2016-01-20 河海大学 Multi-peak photovoltaic array maximum power point tracking algorithm based on jump strategy
CN106647921A (en) * 2017-01-19 2017-05-10 南通大学 Improved MPPT algorithm with reduced influence of partial shading on photovoltaic system
CN106951023A (en) * 2017-03-22 2017-07-14 西交利物浦大学 A kind of multi-peak maximum electric power tracking and controlling method based on β parameters
CN106919215A (en) * 2017-03-29 2017-07-04 西交利物浦大学 A kind of multi-peak maximum electric power tracking based on power increment method

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