CN110299755A - A kind of intelligent solar charge control system and control method - Google Patents
A kind of intelligent solar charge control system and control method Download PDFInfo
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- CN110299755A CN110299755A CN201910523958.1A CN201910523958A CN110299755A CN 110299755 A CN110299755 A CN 110299755A CN 201910523958 A CN201910523958 A CN 201910523958A CN 110299755 A CN110299755 A CN 110299755A
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- voltage
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000007704 transition Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003121 nonmonotonic effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
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- H02J7/0077—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (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 present invention relates to a kind of intelligent solar charge control system and control methods, centered on battery constant-voltage charge voltage, when battery voltage is less than or equal to constant pressure even charging voltage, system takes high speed MPPT to charge, and when battery cell voltage is greater than constant pressure even charging voltage, system takes high speed RPPT to charge, reaching solar panel output power suitably reduces, meet the requirement of battery constant-voltage charge, realize seamless switching, system charging is stablized.The present invention is by RPPT in conjunction with MPPT；Not only maximum power charging had been realized, but also had been realized and constant-voltage charge battery management demand.MPPT charging and RPPT charging combine, and make to have reached seamless transitions between MPPT and constant-voltage charge, and system charging is stablized.
Description
Technical field
The present invention is mainly suitable for solar energy off-network electricity generation system, solar energy carries out the application of MPPT charging to battery,
Solving MPPT charging can not steady switching problem with constant-voltage charge.
Background technique
Solar energy off-network electricity generation system is using more and more extensive, and solar panel is by solar charger to battery
Charging is off-grid system core.In order to make full use of solar panel, MPPT (Maximum Power Point
Tracking) technology is used, and is carried out MPPT tracking to solar panel, is all indispensable to battery Charge Management.But
In entire charging process, such as Fig. 4, to battery Charge Management, when into constant-voltage charge, if solar energy provides energy not
Foot, and solar energy curve of output is non-monotonic curve, cannot achieve and holds cell voltage, it may occur that MPPT charging and constant-voltage charge
It cannot be considered in terms of, MPPT charging and constant-voltage charge conflict in process occur, switch repeatedly, in this switching time, solar battery
Plate utilization rate substantially reduces, and system effectiveness is even not as good as traditional PWM charging modes, therefore there is an urgent need to new technologies to come
Solve the problems, such as this.
The method that document and product use at present is as follows:
1: being in MPPT charging process, when battery voltage reaches constant-voltage charge threshold values, system is converted to the charging side PWM
Formula is reconverted into constant-voltage charge after waiting PWM charging a period of time.
2: the method combined using MPPT charging and constant-voltage charge, when battery voltage reaches constant-voltage charge threshold values
It waits, system is converted to constant-voltage charge by force.
Optimal MPPT charging modes are abandoned in MPPT charging and constant-voltage charge transition period for first method,
System is not allowed to achieve the purpose that make full use of solar panel.
For second method, MPPT charging is converted to constant-voltage charge, conversion past, because of illumination slight variation one by force
Point or therefore convert charging mode, present operating point will deviate from maximum power point, and the energy that solar panel provides is insufficient
To meet constant-pressure conditions, MPPT charging modes will be returned to, so as to cause constantly in the switching repeatedly of two kinds of charge modes,
System generating efficiency is caused to substantially reduce.
This key to the issue difficult point is that solar panel output power with output voltage curve is a similar parabola
Curve, such as Fig. 5, be one it is non-monotonic be incremented by (or monotone decreasing) curve, in solar panel maximum power output voltage
The left side is monotonic increase curve, but becomes monotone decreasing curve again on the right, if singly it is incremented by design negative-feedback according to the left side, but
Operating point moves to right monotone decreasing region, reforms into positive feedback.Similarly if being singly incremented by design negative-feedback according to the right, but
Operating point moves to left monotone decreasing region, reforms into positive feedback.
Summary of the invention
The purpose of the present invention is to provide a kind of intelligent solar charge control system and control methods, to solve above-mentioned skill
Art problem.
To achieve the above object the invention adopts the following technical scheme: a kind of intelligent solar charge control system, special
Sign is, centered on battery constant-voltage charge voltage, when battery voltage is less than or equal to constant pressure even charging voltage, system is taken
High speed MPPT charging, when battery cell voltage is greater than constant pressure even charging voltage, system takes high speed RPPT to charge, and reaches the sun
Energy solar panel output power suitably reduces, and meets the requirement of battery constant-voltage charge, realizes seamless switching, and system charging is stablized.
A kind of control method of intelligent solar charge control system, includes the following steps:
Battery voltage is less than or equal to constant pressure even charging voltage, and system takes MPPT tracing control；
Battery cell voltage is greater than constant pressure even charging voltage, and system takes fast RPPT tracing control；
Then it is successively formed, is terminated through Voltage loop PI controller, electric current loop PI controller, PWM duty cycle.
RPPT charge control method includes the following steps: that charge power is more than or equal to upper period charge power, solar energy
Plate voltage is more than or equal to upper period solar panels voltage, and solar panels are reduced with reference to given, exports solar cell panel voltages
Given or solar panels voltage is less than upper period solar panels voltage, then solar panels increase with reference to given, exports solar energy
Cell plate voltage is given；
Charge power is less than upper period charge power, and solar panels voltage is more than or equal to upper period solar panels voltage, too
Positive energy plate increases with reference to given, and output solar cell panel voltages give, and solar panels voltage is less than upper period solar panels
Voltage, solar panels are reduced with reference to given, and output solar cell panel voltages are given.
Compared with prior art, the invention has the following advantages that the present invention is by RPPT in conjunction with MPPT；1: both having realized most
High-power charging, and realize and constant-voltage charge battery management demand.
2:MPPT charging and RPPT charging combine, and make to have reached seamless transitions between MPPT and constant-voltage charge, system charging
Stablize.
Detailed description of the invention
Fig. 1 is present system control flow chart；
Fig. 2 is present system control structure figure；
Fig. 3 is RPPT trace flow control figure of the present invention；
Fig. 4 management process figure to charge the battery；
Fig. 5 is solar panel output characteristics figure.
Specific embodiment
The present invention is further elaborated in the following with reference to the drawings and specific embodiments.
As shown in Figs. 1-3；The present invention proposes a kind of novel concept, cries and subtracts power tracking technology (Ruduce power
Point tracking), be abbreviated as RPPT technology herein, subtract power tracking technology refer to tracking solar panel power when
It waits, when with constant-voltage charge contradiction, reduces solar panel output power.With battery constant-voltage charge voltage (electricity
Pressure is worth to determine) centered on, when battery voltage is less than constant-voltage charge voltage, system takes high speed MPPT technique, when
When battery cell voltage is greater than constant-voltage charge voltage, system takes high speed RPPT technology, reaches solar panel output work
Rate suitably reduces, to meet the requirement of battery constant-voltage charge.(the control target of RPPT and MPPT are all for solar recharging
Device input voltage, can be realized seamless switching).The MCU that control system of the present invention relies on computing capability powerful, to realize entire control
System, here is detailed program flow diagram and control block diagram.
A kind of control method of intelligent solar charge control system, includes the following steps:
Battery voltage is less than or equal to constant pressure even charging voltage, and system takes MPPT tracing control；
Battery cell voltage is greater than constant pressure even charging voltage, and system takes fast RPPT tracing control；
Then it is successively formed, is terminated through Voltage loop PI controller, electric current loop PI controller, PWM duty cycle.
RPPT charge control method includes the following steps: that charge power is more than or equal to upper period charge power, solar energy
Plate voltage is more than or equal to upper period solar panels voltage, and solar panels are reduced with reference to given, exports solar cell panel voltages
Given or solar panels voltage is less than upper period solar panels voltage, then solar panels increase with reference to given, exports solar energy
Cell plate voltage is given；
Charge power is less than upper period charge power, and solar panels voltage is more than or equal to upper period solar panels voltage, too
Positive energy plate increases with reference to given, and output solar cell panel voltages give, and solar panels voltage is less than upper period solar panels
Voltage, solar panels are reduced with reference to given, and output solar cell panel voltages are given.
The present invention is by RPPT in conjunction with MPPT；Not only maximum power charging had been realized, but also had been realized and constant-voltage charge battery management
Demand.MPPT charging and RPPT charging combine, and make to have reached seamless transitions between MPPT and constant-voltage charge, and system charging is stablized.
The above is present pre-ferred embodiments, for the ordinary skill in the art, according to the present invention
Introduction, in the case where not departing from the principle of the present invention and spirit, changes, modifications, replacement and change that embodiment is carried out
Type is still fallen within protection scope of the present invention.
Claims (3)
1. a kind of intelligent solar charge control system, which is characterized in that centered on battery constant-voltage charge voltage, work as electric power storage
When cell voltage is less than or equal to constant pressure even charging voltage, system takes high speed MPPT to charge, when battery cell voltage is equal greater than constant pressure
When charging voltage, system takes high speed RPPT to charge, and reaching solar panel output power suitably reduces, and meets battery constant pressure
The requirement of charging, realizes seamless switching, and system charging is stablized.
2. a kind of control method of intelligent solar charge control system as described in claim 1, which is characterized in that including such as
Lower step:
Battery voltage is less than or equal to constant pressure even charging voltage, and system takes MPPT tracing control；
Battery cell voltage is greater than constant pressure even charging voltage, and system takes fast RPPT tracing control；
Then it is successively formed, is terminated through Voltage loop PI controller, electric current loop PI controller, PWM duty cycle.
3. a kind of control method of intelligent solar charge control system as described in claim 1, which is characterized in that RPPT fills
Electric control method includes the following steps: that charge power is more than or equal to upper period charge power, and solar panels voltage is more than or equal to
Upper period solar panels voltage, solar panels are reduced with reference to given, and output solar cell panel voltages give or solar panels
Voltage is less than upper period solar panels voltage, then solar panels increase with reference to given, and output solar cell panel voltages are given；
Charge power is less than upper period charge power, and solar panels voltage is more than or equal to upper period solar panels voltage, too
Positive energy plate increases with reference to given, and output solar cell panel voltages give, and solar panels voltage is less than upper period solar panels
Voltage, solar panels are reduced with reference to given, and output solar cell panel voltages are given.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910523958.1A CN110299755A (en) | 2019-06-18 | 2019-06-18 | A kind of intelligent solar charge control system and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910523958.1A CN110299755A (en) | 2019-06-18 | 2019-06-18 | A kind of intelligent solar charge control system and control method |
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| CN110299755A true CN110299755A (en) | 2019-10-01 |
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| CN201910523958.1A Pending CN110299755A (en) | 2019-06-18 | 2019-06-18 | A kind of intelligent solar charge control system and control method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026170A (en) * | 2016-06-28 | 2016-10-12 | 天津科林电气有限公司 | Control method for adjusting photovoltaic grid-connected inverter input power according to power grid voltage |
| CN107154669A (en) * | 2017-06-09 | 2017-09-12 | 深圳市和拓创新科技有限公司 | A kind of outdoor light storage LED high power density transform methods of wide scope input |
| CN108599136A (en) * | 2018-06-14 | 2018-09-28 | 浙江国际海运职业技术学院 | A kind of mode switching method of direct-current grid photovoltaic system |
| CN109888819A (en) * | 2019-01-08 | 2019-06-14 | 许继集团有限公司 | A kind of photovoltaic generating system and its control method and device |
-
2019
- 2019-06-18 CN CN201910523958.1A patent/CN110299755A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026170A (en) * | 2016-06-28 | 2016-10-12 | 天津科林电气有限公司 | Control method for adjusting photovoltaic grid-connected inverter input power according to power grid voltage |
| CN107154669A (en) * | 2017-06-09 | 2017-09-12 | 深圳市和拓创新科技有限公司 | A kind of outdoor light storage LED high power density transform methods of wide scope input |
| CN108599136A (en) * | 2018-06-14 | 2018-09-28 | 浙江国际海运职业技术学院 | A kind of mode switching method of direct-current grid photovoltaic system |
| CN109888819A (en) * | 2019-01-08 | 2019-06-14 | 许继集团有限公司 | A kind of photovoltaic generating system and its control method and device |
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Application publication date: 20191001 |