CN102736661B - MPPT control method in novel photovoltaic system - Google Patents
MPPT control method in novel photovoltaic system Download PDFInfo
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- CN102736661B CN102736661B CN201210229252.2A CN201210229252A CN102736661B CN 102736661 B CN102736661 B CN 102736661B CN 201210229252 A CN201210229252 A CN 201210229252A CN 102736661 B CN102736661 B CN 102736661B
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- voltage
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- maximum power
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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
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- 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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Abstract
The invention discloses an MPPT control method in a novel photovoltaic system. The two-phase MPPT control method comprises two phases of MPP tracking by adopting a constant voltage tracking method (Constant Voltage Tracking CVT) and a variable step incremental admittance method. The constant voltage tracking method (Constant Voltage Tracking CVT) is adopted when the system is started; the variable step incremental admittance method is adopted after the voltage reaches a set value. Maximum power point tracking failure of solar energy cells caused by errors existing in voltage sampling is avoided, and high efficiency reliable operation of the photovoltaic system is realized.
Description
Technical field
The invention belongs to control field.In particular to the MPPT control method in a kind of Novel photovoltaic system.
Background technology
The effect that sun power plays in following energy resource system in the case of traditional fossil energy worsening shortages more and more receives publicity, but the on the low side of photovoltaic cell conversion efficiency is the bottleneck of sun power large-scale promotion application at present.The energy how to utilize to greatest extent solar cell to produce is an important directions of photovoltaic research.
Photovoltaic array output characteristics has nonlinear characteristic, and its output voltage, electric current are affected by Intensity of the sunlight, environment temperature and loading condition.Under certain Intensity of the sunlight and environment temperature, photovoltaic array can be operated in different output voltages, but only in the time of a certain output voltage values, the output power of photovoltaic array just can reach maximal value, at this moment the working point of photovoltaic array has just reached the peak of output power voltage curve, be referred to as maximum power point (Maximum Power Point, MPP).Therefore, in photovoltaic generating system, improve the whole efficiency of system, an important approach is exactly to adjust in real time the working point of photovoltaic array, make it to always work near maximum power point, this process is just referred to as MPPT maximum power point tracking (Maximum Power Point Tracking, MPPT).
, due to the impact of sampling precision and control algolithm, may there is busbar voltage collapse phenomenon in traditional MPPT control method, or MPP follows the tracks of failed phenomenon, and photovoltaic system can not move with maximal efficiency, and the high efficient and reliable operation of photovoltaic system is exerted an influence.Therefore a kind of two stage MPPT control method is proposed.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of two novel stage MPPT control methods.
For realizing above-mentioned goal of the invention, the present invention adopts following technical scheme:
Two described stage MPPT control methods comprise the MPP tracking that adopts constant voltage tracing (Constant voltage tracing CVT) and two stages of variable step incremental conductance method.
When photovoltaic generating system starts, adopt constant voltage tracing, when photovoltaic system output voltage reaches after Voltage-output instruction, adopt variable step incremental conductance method.
Described constant voltage tracing, according to the output P-V family curve of solar cell, the voltage U of photovoltaic system maximum power point
maxfor open-circuit voltage U
obe multiplied by coefficient r, along with output voltage reaches setting value U
set, adopt variable step admittance disturbance observation method to carry out MPP tracking.
Described variable step incremental conductance method, makes improvements prior art.By the P-V family curve of solar cell, there is dP/dV=0 at maximum power point place, and d (VI)/dV=0, can obtain
at maximum power point place,
set up.And the fixed step size tracking of system can cause busbar voltage collapse, therefore, make the step-length of MPPT
a is step-length coefficient.From maximum power point voltage U
maxtime far away, the step-length that control system regulates is large, from maximum power point voltage U
maxwhen nearer, the step-length that control system regulates is little, calculates by the real-time follow-up in DSP, realizes meticulous adjusting during near maximum power point.
Adopt different MPPT control methods in startup with after reaching maximum power point voltage operating instruction, avoided busbar voltage collapse phenomenon, realize reliable efficient tracking of MPPT.
Brief description of the drawings
Fig. 1 is two stage MPPT control method process flow diagrams of the present invention.
Fig. 2 is incremental conductance method voltage-current relationship figure of the present invention.
Fig. 3 is MPPT control method topology diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.
Photovoltaic system starts, and sampling open-circuit voltage, calculates setting value U
set=U
o* r, progressively reduces output voltage values, if U>U
set, still realize MPPT control method with constant voltage tracing, if U<U
set, enter the MPPT control method of subordinate phase, i.e. variable step incremental conductance method.Approximate treatment dV, dI, dP, calculate step-length simultaneously
a is step-length coefficient, and Fig. 2 is incremental conductance method implementation method, if
be that solar cell output voltage is at [0, U
1] in scope, now, can be by regulating dutycycle constantly increase output voltage.If
be that solar cell output voltage is at [U
1, U
2] in scope, now, can be by regulating dutycycle constantly reduce output voltage.The incremental conductance method of variable step also needs to regulate according to actual conditions the size of step-length coefficient A, can determine by admittance increment disturbance repeatedly the working range of maximum power point, judges the now precision of step-length coefficient A by output voltage or power.If now power is away from maximum power point, increase step-length coefficient A.If now power is close to maximum power point, reduce step-length coefficient A.If when power is operated near maximum power point, step-length coefficient A is accurate to certain scope, regulates in this step-length coefficient range.
Adopt Boost Circuit verification to implement the MPPT control method in Novel photovoltaic system.
Two stage MPPT control methods of photovoltaic system are improved traditional single MPPT, have solved the problem of busbar voltage collapse and sampling precision.When startup, adopt constant voltage tracing, adopt improved variable step incremental conductance method after reaching given voltage, regulate the requirement that reaches high efficient and reliable and realize MPPT control method by two stages.
Although the present invention with preferred embodiment openly as above, embodiment and accompanying drawing are not of the present invention for limiting.Without departing from the spirit and scope of the invention, any equivalence of doing changes or retouching, belongs to equally the present invention's protection domain.Therefore protection scope of the present invention should be taking the application's the content that claim was defined as standard.
Claims (1)
1. the MPPT control method in a photovoltaic system, realize the maximal power tracing of photovoltaic solar cell, different phase adopts different MPPT control methods, when startup, adopt constant voltage tracing, photovoltaic system output voltage adopts variable step incremental conductance method after reaching setting value, it is characterized in that:
When described startup, adopt constant voltage tracing, when photovoltaic system output voltage does not reach setting value
u set time, photovoltaic system constantly regulates, and imposes a condition until meet output voltage; Described constant voltage tracing, according to the output P-V family curve of solar cell, the voltage of photovoltaic system maximum power point
u max for open-circuit voltage
u o be multiplied by coefficient r, along with output voltage reaches setting value
u set , adopt variable step admittance disturbance observation method to carry out MPP tracking;
Photovoltaic system starts, and sampling open-circuit voltage, calculates setting value
u set =
u o * r, progressively reduces output voltage values, if
u>
u set , still realize MPPT control method with constant voltage tracing, if
u<
u set , enter the MPPT control method of subordinate phase, i.e. variable step incremental conductance method; If
, solar cell output voltage [0,
u 1 ] in scope, now, by regulating dutycycle constantly to increase output voltage; If
, solar cell output voltage [
u 1 ,
u 2 ] in scope, now, by regulating dutycycle constantly to reduce output voltage;
Described photovoltaic system output voltage adopts variable step incremental conductance method after reaching setting value, sets and regulates step-length to be
, pass through
part is determined regulative mode, and by step-length coefficient, A determines degree of regulation; Described variable step incremental conductance method, by the P-V family curve of solar cell, there is dP/dV=0 at maximum power point place, and d (VI)/dV=0, can obtain
, at maximum power point place,
set up, make the step-length of MPPT
, A is step-length coefficient, from maximum power point voltage
u max time far away, the step-length that control system regulates is large, from maximum power point voltage
u max when nearer, the step-length that control system regulates is little, calculates by the real-time follow-up in DSP, realizes meticulous adjusting during near maximum power point.
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| CN102736661B true CN102736661B (en) | 2014-06-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102880224A (en) * | 2012-10-26 | 2013-01-16 | 天津理工大学 | Double-mode maximum power point tracking (MPPT) method based on improved step length |
| CN102929325A (en) * | 2012-11-28 | 2013-02-13 | 河海大学 | Method for tracking maximum power of high-accuracy single-stage photovoltaic power generation system |
| CN103488239B (en) * | 2013-09-29 | 2016-07-06 | 武汉理工大学 | A kind of maximum power point tracing method in photovoltaic combining inverter |
| CN104638956B (en) * | 2013-11-13 | 2017-06-16 | 阳光电源股份有限公司 | A kind of MPPT control devices of inverter, method and inverter |
| CN104199507B (en) * | 2014-08-22 | 2017-08-29 | 上海寰晟新能源科技有限公司 | Photovoltaic maximal power tracing system and method based on P U curvature characteristics |
| CN104950983B (en) * | 2015-06-30 | 2016-12-14 | 广东美的制冷设备有限公司 | Solaode maximum power point tracking device and tracking |
| CN105116957B (en) * | 2015-07-22 | 2017-03-15 | 厦门科华恒盛股份有限公司 | A kind of maximum power point of photovoltaic power generation system tracking |
| CN106292830A (en) * | 2016-09-19 | 2017-01-04 | 江苏大学 | A kind of maximum power point of photovoltaic power generation system tracking of improvement |
| CN107484292A (en) * | 2017-08-07 | 2017-12-15 | 广东电力士照明科技有限公司 | A kind of intelligent dimming LED with solar maximum power tracing control |
| CN108983862B (en) * | 2018-08-08 | 2021-02-02 | 江苏固德威电源科技股份有限公司 | Maximum power point tracking method |
| CN108681363A (en) * | 2018-08-13 | 2018-10-19 | 江苏吉泰科电气股份有限公司 | The MPPT control method of constant pressure combination variable step conductance increment |
| CN108874017A (en) * | 2018-08-22 | 2018-11-23 | 海南电网有限责任公司电力科学研究院 | A kind of maximum power point tracing method of photovoltaic generating system |
| CN112383087B (en) * | 2020-10-26 | 2022-06-10 | 浙江大学 | Photovoltaic under-power output control method |
| CN112198924B (en) * | 2020-11-19 | 2022-07-05 | 大连海事大学 | Maximum power point tracking method for photovoltaic cell |
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| CN100578420C (en) * | 2008-02-28 | 2010-01-06 | 上海交通大学 | Voltage-variable photovoltaic system maximal power tracing control method adapting to weather status |
| CN101635540B (en) * | 2009-08-18 | 2012-07-04 | 河海大学 | Method for tracking photovoltaic maximum power point |
| CN102148507A (en) * | 2010-02-08 | 2011-08-10 | 南京冠亚电源设备有限公司 | Photovoltaic grid-connected inverter MPPT (Maximum Power Point Tracking) system based on admittance optimization algorithm |
| US8922061B2 (en) * | 2010-03-22 | 2014-12-30 | Tigo Energy, Inc. | Systems and methods for detecting and correcting a suboptimal operation of one or more inverters in a multi-inverter system |
| EP2390751B1 (en) * | 2010-05-28 | 2013-09-04 | Nxp B.V. | Maximum power point tracking method, photovoltaic system controller and photovoltaic system |
| CN101877559A (en) * | 2010-06-29 | 2010-11-03 | 苏州市职业大学 | Compound control method for fast and accurate tracking control of maximum power point of photovoltaic power generation system |
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