CN104883121B - Photovoltaic cell control method based on power-voltage fitting curve - Google Patents
Photovoltaic cell control method based on power-voltage fitting curve Download PDFInfo
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- CN104883121B CN104883121B CN201510271749.4A CN201510271749A CN104883121B CN 104883121 B CN104883121 B CN 104883121B CN 201510271749 A CN201510271749 A CN 201510271749A CN 104883121 B CN104883121 B CN 104883121B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005286 illumination Methods 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 16
- 238000004422 calculation algorithm Methods 0.000 claims abstract description 15
- 238000005457 optimization Methods 0.000 claims description 4
- 101100379079 Emericella variicolor andA gene Proteins 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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- 238000007796 conventional method Methods 0.000 description 1
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- 230000001172 regenerating effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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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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- Control Of Electrical Variables (AREA)
Abstract
The invention relates to the technical field of photovoltaic power generation, and aims to provide a photovoltaic cell control method and system based on a power-voltage fitting curve. The method mainly comprises the following steps: measuring the output voltage and the output current of the photovoltaic cell, and calculating to obtain the output power of the photovoltaic cell; updating sampling points, and arranging the latest three sampling points from small to large according to the voltage; obtaining optimal illumination and temperature fitting values through a particle swarm algorithm, and substituting the optimal illumination and temperature fitting values into a photovoltaic cell power-voltage relational expression to obtain a photovoltaic cell P-V fitting curve; and searching a maximum power point or a voltage corresponding to the power reference value on the fitting curve to be used as a voltage reference for subsequent booster circuit control. The photovoltaic cell power-voltage fitting curve obtained by the invention can give the illumination and temperature value of the environment where the photovoltaic cell is located and the photovoltaic cell power-voltage curve in the current environment in real time, so as to be beneficial to the implementation of photovoltaic power generation maximum power or constant power control.
Description
Technical field
A kind of the present invention relates to technical field of photovoltaic power generation, in particular it relates to photovoltaic based on power vs. voltage matched curve
Battery control method and system.
Background technology
In the last few years, because the exhausted problem of World Environment Problems and non-renewable energy resources is increasingly severe, new forms of energy are made
For a kind of cleaning, regenerative resource be developed rapidly, especially photovoltaic generation.For photovoltaic cell modeling problem, existing
Numerous studies document, document " the photovoltaic array matlab Universal Simulation Model with mppt function " is modeled to photovoltaic,
Give any illumination, at a temperature of photovoltaic power voltage relationship.But photovoltaic generation power control is but mainly concentrated
In maximal power tracing control model, in recent years, photovoltaic generation power limitation control just gradually receives publicity.Due to conventional art not
The power vs. voltage curve of photovoltaic cell can be fitted, therefore maximal power tracing controls the method adopting to be mainly short circuit electricity
Stream method, disturbance observation method, conductance increment method etc., the method that power limitation control adopts is mainly based upon the photovoltaic of newton quadratic interpolation
Constant dc power control technology and disturbance observation method.These conventional methods are only capable of reflecting a part for photovoltaic power voltage relationship
Information, can not reflect the illumination of photovoltaic cell local environment, the corresponding photovoltaic output of each voltage at temperature, and current environment
Power, is unfavorable for the efficient utilization of photovoltaic generation and develops further.
Content of the invention
The technical problem to be solved in the present invention is to overcome deficiency of the prior art, proposes a kind of power vs. voltage that is based on and intends
Close photovoltaic cell control method and the system of curve.
For achieving the above object, the technical solution used in the present invention is:
There is provided a kind of photovoltaic cell control method based on power vs. voltage matched curve, including by booster circuit to light
The output voltage of volt battery is controlled；It is by the power vs. voltage matching of photovoltaic cell that the voltage of booster circuit controls reference value
Curve acquisition, the fit procedure of power vs. voltage matched curve includes:
(1) gather the output voltage v of photovoltaic cellpvWith output current ipv, calculate the output power from photovoltaic cells ppv；
(2) judge output voltage vpvWith the output power from photovoltaic cells ppvWhether meet condition of convergence formula (1):
|ppv-p(vpv) | ＜ ε (1)
In formula (1), p (vpv) the output power from photovoltaic cells that obtains for matching；ε is the error threshold setting；
If formula (1) meets, this sampled point is described in former matched curve, need not matching again；
If formula (1) is unsatisfactory for, illustrate that the illumination condition of environment and temperature conditionss have occurred and that change, need to be substituted with new sampled point and adopt
Sampling pointAgain matched curve；Rearrange sampled point according to magnitude of voltage size from small to large
(3) with three sampled pointsAs input quantity, with illumination match value rpsoIntend with temperature
Conjunction value tpsoAs output；Meanwhile, with illumination match value rpsoWith temperature foh value tpsoAs variable to be optimized, adopted with three
Sampling point corresponding power samples valuePower match value (p corresponding with matched curvepso1、ppso2、ppso3) inclined
Difference square accumulation andAs performance indications；By different illumination value r and temperature value t
Bring photovoltaic power voltage curve into, draw the illumination match value r of optimum by particle cluster algorithm optimizationpsoAnd temperature foh
Value tpso, then bring photovoltaic power voltage relationship into, draw photovoltaic power-voltage matched curve；
(4) maximum power point or the corresponding electricity of value and power reference are found on photovoltaic power-voltage matched curve
Pressure, the voltage reference value controlling as follow-up booster circuit.
Invention further provides the photovoltaic cell control system based on power vs. voltage matched curve, including liter piezoelectricity
Road, also includes: measurement module, for gathering output voltage and the output current of photovoltaic cell；Sampled point update module is used for sentencing
Whether disconnected sampled point output voltage and the output power from photovoltaic cells are met the condition of convergence and are rearranged using point to after updating；Grain
Swarm optimization fitting module, for matching photovoltaic power-voltage matched curve；With Voltage Reference computing module, it is used for seeking
Look for maximum power point or the corresponding voltage reference value of value and power reference；Measurement module, sampled point update module, particle cluster algorithm
Fitting module and Voltage Reference computing module are sequentially connected electrically and constitute loop, and Voltage Reference computing module and booster circuit are electrically connected
Connect.
Compared with prior art, the beneficial effects of the present invention is:
Photovoltaic power-voltage matched curve that the present invention obtains, can provide photovoltaic cell local environment in real time
Photovoltaic power-voltage curve under illumination and temperature value, and current environment, is beneficial to photovoltaic maximum power or permanent work(
The enforcement that rate controls.
Brief description
Fig. 1 is the photovoltaic generation main circuit diagram described in the preferred embodiment of the present invention；
Fig. 2 is photovoltaic cell p-v curve fitting routine figure；
Fig. 3 is particle cluster algorithm Optimal Fitting procedure chart.
Specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are illustrated with the preferred reality it will be appreciated that this time described
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.It is in straight by photovoltaic application in this preferred embodiment
In stream micro-capacitance sensor, it is equally applicable for exchanging in micro-capacitance sensor.
Fig. 1 is the photovoltaic generation main circuit diagram described in the preferred embodiment of the present invention, comprises photovoltaic cell, photovoltaic DC bus
Electric capacity, booster circuit and direct-current grid bus.Fig. 2 is photovoltaic cell p-v curve fitting routine figure, comprises measurement module 1, adopts
Sampling point update module 2, particle cluster algorithm fitting module 3, Voltage Reference computing module 4, for illustrating based on particle cluster algorithm
Photovoltaic cell p-v curve fitting process.Fig. 3 is particle cluster algorithm Optimal Fitting procedure chart, is used for elaborating and utilizes population
Algorithm optimization simulates the process of optimum illumination match value and temperature foh value.
In Fig. 1, Fig. 2, Fig. 3, each symbol is meant that: v voltage, p power, k iterationses, ppvThe output power from photovoltaic cells,
vpvPhotovoltaic cell output voltage, ipvPhotovoltaic cell output current,1st sample amplitude when reproduced value of kth time,The of kth time
1 sampled point performance number,2nd sample amplitude when reproduced value of kth time,2nd sampled point performance number of kth time,Kth time
3rd sample amplitude when reproduced value,3rd sampled point performance number of kth time, rpsoIllumination match value, r illumination value, tpsoTemperature is intended
Conjunction value, t temperature value, f photovoltaic power-voltage relationship, ppso1In photovoltaic cell p-v matched curveCorresponding performance number,
ppso2In photovoltaic cell p-v matched curveCorresponding performance number, ppso3In photovoltaic cell p-v matched curveCorresponding power
Value, y performance indications, cpvPhotovoltaic DC bus capacitor, vrefVoltage reference value, the corresponding photovoltaic electric of voltage v in p (v) matched curve
Pond output, p (vpv) voltage v in matched curvepvCorresponding the output power from photovoltaic cells, ε error threshold.
Photovoltaic cell p-v curve-fitting method based on particle cluster algorithm is as shown in Fig. 2 include measurement module 1, sampled point
Update module 2, particle cluster algorithm fitting module 3, Voltage Reference computing module 4.Measurement photovoltaic cell output voltage and output electricity
Stream, is calculated the output power from photovoltaic cells；Judge whether to meet the condition of convergence, update sampled point, according to voltage swing from little
To rearranging greatly three sampled points；Optimum illumination match value and temperature foh value are drawn by particle cluster algorithm, brings photovoltaic into
Photovoltaic cell p-v matched curve is drawn in the power of battery-voltage relationship；Maximum power point or work(are found on matched curve
The corresponding voltage reference value of rate reference value, the Voltage Reference controlling as follow-up booster circuit.
Specifically comprise the following steps that
(1) measurement module 1 collection photovoltaic cell output voltage vpvWith output current ipv, it is calculated photovoltaic cell output
Power ppv；
(2) sampled point update module 2 obtains photovoltaic cell output voltage v by step (1)pvAnd the output power from photovoltaic cells
ppv；Judge whether to meet the condition of convergence, the condition of convergence is the output power from photovoltaic cells p collectingpvThe light obtaining with matching
Volt cell output p (vpv) difference very little, such as following formula:
|ppv-p(vpv) | ＜ ε (1)
Wherein, ε is the error threshold that can set.If formula (1) meets, new sampled point, in former matched curve, need not weigh
New matching.If formula (1) is unsatisfactory for, illustrates that environment has occurred and that change, need matched curve again, sampled point is substituted with new sampled point
Rearrange sampled point according to magnitude of voltage size from small to large
(3) particle cluster algorithm Optimal Fitting process is as shown in Figure 3.
Three sampled points are obtained by step (2)Three sampled points, as input quantity, export
Amount is illumination match value rpsoWith temperature foh value tpso, illumination match value r simultaneouslypsoWith temperature foh value tpsoAs change to be optimized
Amount, the corresponding power samples value of three voltagePower match value (p corresponding with matched curvepso1、ppso2、
ppso3) deviation square accumulation andAs performance indications.
Initialization produces population, and the value of each particle is assigned to illumination value r and temperature value t, each group of illumination value r and temperature
Angle value t is all brought photovoltaic power voltage relationship into and is obtained a matched curve, finds in every matched curve
Corresponding ppso1、ppso2、ppso3, calculation of performance indicators
Judge whether to meet end condition, end condition is that particle cluster algorithm iterationses are more than the greatest iteration setting time
Number.If being unsatisfactory for, it is updated producing new population according to the more new regulation of particle cluster algorithm；If meeting, by optimum
Particle corresponding optimum illumination match value rpsoWith temperature foh value tpsoAs output.
Then by optimum illumination match value rpsoWith temperature foh value tpsoBring photovoltaic power voltage relationship into, draw
Photovoltaic cell p-v matched curve.
(4) maximum power point or the corresponding voltage of value and power reference are found on this matched curve and rise piezoelectricity as follow-up
The Voltage Reference that road controls.
Finally it should be noted that: above specific embodiment is only used for above example, only in order to illustrate the present invention's
Technical scheme rather than be limited, although being described in detail to the present invention with reference to above-mentioned embodiment, affiliated neck
The those of ordinary skill in domain it is understood that still the specific embodiment of the present invention can be modified or equivalent,
And any modification without departing from spirit and scope of the invention or equivalent, it all should cover the claim model in the present invention
In the middle of enclosing.
Claims (1)
1. the photovoltaic cell control method based on power vs. voltage matched curve, including defeated to photovoltaic cell by booster circuit
Go out voltage to be controlled；It is characterized in that, it is by the power vs. voltage matching of photovoltaic cell that the voltage of booster circuit controls reference value
Curve acquisition, the fit procedure of power vs. voltage matched curve includes:
(1) gather the output voltage v of photovoltaic cellpvWith output current ipv, calculate the output power from photovoltaic cells ppv；
(2) judge output voltage vpvWith the output power from photovoltaic cells ppvWhether meet condition of convergence formula (1):
|ppv-p(vpv) | ＜ ε (1)
In formula (1), p (vpv) the output power from photovoltaic cells that obtains for matching；ε is the error threshold setting；
If formula (1) meets, this sampled point is described in former matched curve, need not matching again；If formula (1) is unsatisfactory for, explanation
The illumination condition of environment and temperature conditionss have occurred and that change, need to substitute sampled point with new sampled pointAgain matching is bent
Line；Rearrange sampled point according to magnitude of voltage size from small to large
(3) with three sampled pointsAs input quantity, with illumination match value rpsoWith temperature foh value
tpsoAs output；Meanwhile, with illumination match value rpsoWith temperature foh value tpsoAs variable to be optimized, with three sampled points
Corresponding power samples valuePower match value (p corresponding with matched curvepso1、ppso2、ppso3) deviation square
Accumulation andAs performance indications；Different illumination value r and temperature value t are brought into light
Volt power of battery voltage curve, draws the illumination match value r of optimum by particle cluster algorithm optimizationpsoWith temperature foh value tpso,
Then bring photovoltaic power voltage relationship into, draw photovoltaic power-voltage matched curve；
(4) find maximum power point or the corresponding voltage of value and power reference in photovoltaic power-voltage matched curve, make
The voltage reference value controlling for follow-up booster circuit.
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Effective date of registration: 20220523 Address after: 311201 No. 678, chenduan Road, Xintang street, Xiaoshan District, Hangzhou City, Zhejiang Province Patentee after: ZHEJIANG ZHONGXIN ELECTRIC POWER ENGINEERING CONSTRUCTION Co.,Ltd. AUTOMATION BRANCH Patentee after: ZHEJIANG ZHONGXIN ELECTRIC POWER ENGINEERING CONSTRUCTION Co.,Ltd. Patentee after: STATE GRID ZHEJIANG XIAOSHAN DISTRICT POWER SUPPLY Co.,Ltd. Address before: 310058 Yuhang Tang Road, Xihu District, Hangzhou, Zhejiang 866 Patentee before: ZHEJIANG University |
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