CN108363451A - A kind of solar power generation variable step MPPT control devices and method - Google Patents
A kind of solar power generation variable step MPPT control devices and method Download PDFInfo
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- CN108363451A CN108363451A CN201810069182.6A CN201810069182A CN108363451A CN 108363451 A CN108363451 A CN 108363451A CN 201810069182 A CN201810069182 A CN 201810069182A CN 108363451 A CN108363451 A CN 108363451A
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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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- 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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- Automation & Control Theory (AREA)
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Abstract
The present invention relates to the maximum power point of solar power generation tracking control technical fields more particularly to a kind of solar power generation variable step MPPT control devices and method in photovoltaic system.A kind of solar power generation provided by the invention variable step MPPT control devices, including PV arrays, voltage transformation module, voltage check device, current sensing means, the MPPT control modules based on DSP, display module, driving circuit and load.The present invention also provides a kind of variable step MPPT control methods, can track maximum power point within a short period of time, have preferable stability and precision, and tracing process is steadily rapid.
Description
Technical field
The present invention relates to the maximum power point of solar power generation tracking control technical fields in photovoltaic system, more particularly to
It is a kind of solar power generation variable step MPPT control devices and method.
Background technology
Energy availability and demand problem is increasingly severe, and in order to make earth environment be improved, people increasingly pay attention to new energy
It develops and utilizes, the especially utilization of regenerative resource.Solar energy can be solved as a kind of new green power because of conventional energy resource
Exhausted and initiation energy crisis, by extensive concern both domestic and external.And photovoltaic generation is then currently to utilize the main of solar energy
One of form.The energy conversion efficiency of photovoltaic system can be effectively promoted using maximum power point tracking technology.Common MPPT methods
Middle open-circuit voltage Y-factor method Y and short circuit current Y-factor method Y, control are simply easily achieved, but need periodically disconnection or short-circuit light
Battery is lied prostrate, leads to more power loss, and its operating point is not real maximum power point.Conductance increment method is by comparing light
Conductance increment and the moment conductance of battery are lied prostrate to change the control signal of system.Since the step-length of conventional conductance increment method is to fix
Step-length, therefore can not be taken into account in response speed and asking for stable state accuracy, when choosing larger step-length, tracking velocity is improved,
But steady state power loss is more；Tracking accuracy is protected when choosing smaller step-length, but tracking velocity declines.It is steady in order to solve
Contradiction between state precision and response speed, the present invention propose a kind of solar power generation variable step MPPT control devices and side
Method.
Invention content
The purpose of the present invention is to solve fixed step algorithm steady-state behaviours in the prior art and dynamic property to take into account,
The slower problem of traditional Variable Step Algorithm convergence rate provides a kind of novel solar power generation variable step MPPT control dresses
It sets and method.
The present invention provides a kind of solar power generation variable step MPPT control devices, including PV arrays, voltage transformation lists
Member, voltage check device, current sensing means, the MPPT control modules based on DSP, display module, driving circuit and load, institute
It includes capacitance C1, inductance L1, switching tube Q1, diode D1 and capacitance C2 to state voltage transformation module；Distinguish at the both ends of capacitance C1
Connect with the positive and negative anodes of PV arrays, the anode of one end of inductance L1 connection PV arrays, the drain electrode of other end connecting valve pipe Q1 with
And the anode of diode D1, the source electrode ground connection of switching tube, one end of the cathode connection capacitance C2 of diode D1, capacitance C2's is another
End ground connection, the grid of the output end connecting valve pipe Q1 of driving circuit；Voltage check device is connected with current sensing means and is based on
The MPPT control modules of DSP, and the voltage signal detected and current signal are sent to MPPT control modules respectively；MPPT is controlled
Molding block connects driving circuit, and pwm signal is sent to driving circuit, the output end connection load of voltage transformation module；
MPPT control modules are also associated with display module, can in real time display system voltage, electric current and power data.
A kind of control method of above-mentioned improved MPPT control devices comprising following steps：
(1) current time voltage U (k) and current time are detected by voltage check device and current sensing means respectively
Electric current I (k), and obtain voltage increment △ U=U (k)-U (k-1), current increment △ I=I (k)-I (k-1), power increment △ P
=U (k) * I (k)-U (k-1) * I (k-1)；Then △ P △ U, △ P/ △ U is calculated；Wherein, U (k-1), I (k-1) are respectively
Previous voltage value and current value using the moment；
(2) judge whether the absolute value of △ P/ △ U is more than K, if it is, enabling Us=STEP1, then execute step (3)；
If it is not, then Us=STEP2 is enabled,Then step (3) is executed；Wherein, K is preset fixed
Value, C are constant, and Us is disturbance step-length, and STEP1 is fixed step size factor, and STEP2 is change step factor；
(3) judge whether △ P △ U are equal to 0, if it is, directly returning；If it is not, then further executing step (4)；
(4) judge whether △ P △ U are more than 0, if it is, enabling Uref=U (k)+Us, be then back to；If it is not, then enabling
Uref=U (k)-Us, is then back to；Wherein, Uref is reference voltage level.
Compared with prior art, the present invention having the following advantages that and advantageous effect：
Novel solar power generation variable step MPPT control devices proposed by the present invention can be within a short period of time with method
Maximum power point is tracked, there is preferable stability and precision, and tracing process is steadily rapid.
Description of the drawings
Fig. 1 is a kind of solar power generation variable step MPPT controling device structure diagrams provided by the invention.
Fig. 2 is a kind of variable step MPPT control method flow chart provided by the invention.
Fig. 3 is the algorithm simulating result figure of the present invention.
Specific implementation mode
The present invention provides a kind of solar power generation variable step MPPT control devices and method, to make the mesh of the present invention
, technical solution and advantage it is clearer, clear, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
As shown in Figure 1, a kind of solar power generation variable step MPPT control devices, including PV arrays, voltage transformation module,
Voltage check device, current sensing means, the MPPT control modules based on DSP, display module, driving circuit and load, it is described
Voltage transformation module includes capacitance C1, inductance L1, switching tube Q1, diode D1 and capacitance C2；The both ends of capacitance C1 respectively with
The positive and negative anodes of PV arrays connect, the anode of one end connection PV arrays of inductance L1, the drain electrode of other end connecting valve pipe Q1 and
The anode of diode D1, the source electrode ground connection of switching tube, one end of the cathode connection capacitance C2 of diode D1, the other end of capacitance C2
Ground connection, the grid of the output end connecting valve pipe Q1 of driving circuit；Voltage check device is connected with current sensing means is based on DSP
MPPT control modules, and the voltage signal detected and current signal are sent to MPPT control modules respectively；MPPT is controlled
Module connects driving circuit, and pwm signal is sent to driving circuit, the output end connection load of voltage transformation module；MPPT
Control module is also associated with display module, can in real time display system voltage, electric current and power data.
As shown in Fig. 2, a kind of control method of above-mentioned improved MPPT control devices comprising following steps：
(1) current time voltage U (k) and current time are detected by voltage check device and current sensing means respectively
Electric current I (k), and obtain voltage increment △ U=U (k)-U (k-1), current increment △ I=I (k)-I (k-1), power increment △ P
=U (k) * I (k)-U (k-1) * I (k-1)；Then △ P △ U, △ P/ △ U is calculated；Wherein, U (k-1), I (k-1) are respectively
Previous voltage value and current value using the moment；
(2) judge whether the absolute value of △ P/ △ U is more than K, if it is, enabling Us=STEP1, then execute step (3)；
If it is not, then Us=STEP2 is enabled,Then step (3) is executed；Wherein, K is preset fixed
Value, C are constant, and Us is disturbance step-length, and STEP1 is fixed step size factor, and STEP2 is change step factor；
(3) judge whether △ P △ U are equal to 0, if it is, directly returning；If it is not, then further executing step (4)；
(4) judge whether △ P △ U are more than 0, if it is, enabling Uref=U (k)+Us, be then back to；If it is not, then enabling
Uref=U (k)-Us, is then back to；Wherein, Uref is reference voltage level.
Above-mentioned improved variable step control algolithm is by judging that △ P △ U determine the position of power points, i.e., in maximum power point
At left side, right side or maximum power point, the next step change direction of disturbance step-length is then determined.WhenWhen more than definite value K,
At this time farther out apart from the position of maximum power point, disturbance step-length Us=STEP1 is also larger；WhenWhen less than definite value K, Us at this time
=STEP2 is also smaller, and as maximum power point is constantly approached in operating point, step-length also becomes smaller rapidly, and system quickly converges on maximum
Near power points.Compared with traditional Variable Step Algorithm, there is better rapidity and stability.Fig. 3 is the emulation knot of system
Fruit is schemed.
The MPPT control systems of the present invention, relative to traditional MPPT systems and algorithm, can solve traditional fixed step with method
The problem of rapidity and stability can not be taken into account in long algorithm, convergence more faster than traditional Variable Step Algorithm, and stability compared with
It is good.It should be understood that the application of the present invention is not limited to the above, for those of ordinary skills, Ke Yigen
It is improved or converted according to above description, all these modifications and variations should all belong to the protection model of appended claims of the present invention
It encloses.
Claims (3)
1. a kind of solar power generation variable step MPPT control devices, which is characterized in that including PV arrays, voltage transformation module,
Voltage check device, current sensing means, the MPPT control modules based on DSP, display module, driving circuit and load, voltage
Detection device connects the MPPT control modules based on DSP with current sensing means, and respectively by the voltage signal detected and electricity
Stream signal is sent to MPPT control modules；MPPT control modules connect driving circuit, and pwm signal is sent to driving circuit,
The output end connection load of voltage transformation module；MPPT control modules are also associated with display module, can real-time display system
Voltage, electric current and power data.
2. a kind of solar power generation variable step MPPT control devices as described in claim 1, which is characterized in that the voltage
Converter unit includes capacitance C1, inductance L1, switching tube Q1, diode D1 and capacitance C2；The both ends of capacitance C1 respectively with PV gusts
The positive and negative anodes of row connect, the anode of one end connection PV arrays of inductance L1, the drain electrode of other end connecting valve pipe Q1 and two poles
The anode of pipe D1, the source electrode ground connection of switching tube, one end of the cathode connection capacitance C2 of diode D1, another termination of capacitance C2
Ground, the grid of the output end connecting valve pipe Q1 of driving circuit.
3. a kind of solar power generation as claimed in claim 1 or 2 control method of variable step MPPT control devices, feature
It is, the described method comprises the following steps：
(1) current time voltage U (k) and current time electric current are detected by voltage check device and current sensing means respectively
I (k), and obtain voltage increment △ U=U (k)-U (k-1), current increment △ I=I (k)-I (k-1), power increment △ P=U
(k)*I(k)-U(k-1)*I(k-1)；Then △ P △ U, △ P/ △ U is calculated；Wherein, before U (k-1), I (k-1) are respectively
One uses the voltage value and current value at moment；
(2) judge whether the absolute value of △ P/ △ U is more than K, if it is, enabling Us=STEP1, then execute step (3)；If
It is no, then Us=STEP2 is enabled,Then step (3) is executed；Wherein, K is preset definite value, and C is
Constant, Us are disturbance step-length, and STEP1 is fixed step size factor, and STEP2 is change step factor；
(3) judge whether △ P △ U are equal to 0, if it is, directly returning；If it is not, then further executing step (4)；
(4) judge whether △ P △ U are more than 0, if it is, enabling Uref=U (k)+Us, be then back to；If it is not, then enabling Uref
=U (k)-Us, are then back to；Wherein, Uref is reference voltage level.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116774768A (en) * | 2023-08-22 | 2023-09-19 | 深圳市德兰明海新能源股份有限公司 | Power tracking method and system for channel multiplexing energy storage power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116774768A (en) * | 2023-08-22 | 2023-09-19 | 深圳市德兰明海新能源股份有限公司 | Power tracking method and system for channel multiplexing energy storage power supply |
| CN116774768B (en) * | 2023-08-22 | 2024-02-06 | 深圳市德兰明海新能源股份有限公司 | Power tracking method and system for channel multiplexing energy storage power supply |
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Application publication date: 20180803 |