CN102255573B - Control method for improving photoelectric conversion efficiency in photovoltaic power generation system - Google Patents
Control method for improving photoelectric conversion efficiency in photovoltaic power generation system Download PDFInfo
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- CN102255573B CN102255573B CN2011102054498A CN201110205449A CN102255573B CN 102255573 B CN102255573 B CN 102255573B CN 2011102054498 A CN2011102054498 A CN 2011102054498A CN 201110205449 A CN201110205449 A CN 201110205449A CN 102255573 B CN102255573 B CN 102255573B
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Abstract
The invention provides a control method for improving photoelectric conversion efficiency in a photovoltaic power generation system. The control method mainly comprises the following steps of: obtaining a power absolute value DeltaP of a difference between the power P(K) of a photovoltaic cell at a current moment and the power P(K-1) of the photovoltaic cell at a previous moment, judging whether the ratio DeltaP/a(K-1) of the power absolute value DeltaP to a duty ratio regulation step length a(K-1) at the previous moment is greater than a second preset value or not, and calculating the product of the ratio DeltaP/a(K-1) of the power absolute value DeltaP to the duty ratio regulation step length a(K-1) and a first regulation parameter M as the duty ratio regulation step length a(K) at the current moment. By the method, the power of the system approaches to a maximum power point by different step lengths to accelerate the tracking of the whole system and improve the photoelectric conversion efficiency.
Description
Technical field
The present invention relates to photovoltaic generating system, especially advertisement information distribution system particularly, relates to the control method that improves photoelectric conversion efficiency in the photovoltaic generating system.
Background technology
In the photovoltaic converting system, the MPPT maximum power point tracking technology is very important research direction, in order to improve photovoltaic efficiency under the same conditions, people have proposed the method for various MPPT maximum power point tracking (MPPT), such as climbing method, conductance increment method, triangle test, constant voltage process etc.The photovoltaic battery array output characteristic has nonlinear characteristic, and its output voltage and power are influenced by intensity of illumination, ambient temperature and loading condition.Under certain intensity of illumination and ambient temperature, photovoltaic cell can have different output voltages, but only when a certain output voltage values, the power output of photovoltaic cell just can reach maximum, at this moment the working point of photovoltaic cell has just reached the peak of output power curve, is referred to as maximum power point.Therefore, in photovoltaic generating system, improve the whole efficiency of system, an important approach is exactly to adjust the working point of photovoltaic cell in real time, makes it to always work near the maximum power point, and this process just is referred to as MPPT maximum power point tracking (MPPT).
The operation principle of MPPT is: in the cycle of a regulation, microprocessor is the duty ratio D of active adjustment PWM termly, change the output current of solar cell, thereby the output voltage that causes solar cell changes, detect solar cell output voltage and output current, calculate the power output of solar battery array, seek the position of maximum power point then according to the MPPT maximum power point tracking strategy.
Summary of the invention
At defective of the prior art, the purpose of this invention is to provide the control method that improves photoelectric conversion efficiency in a kind of photovoltaic generating system.
According to an aspect of the present invention, provide the control method that improves photoelectric conversion efficiency in the photovoltaic generating system, it is characterized in that, comprise the steps:
Steps A: according to the voltage V(K of the photovoltaic cell end of current time) calculates the power P (K) of the photovoltaic cell end of current time with electric current I (K);
Step B: the power absolute value of difference of power P (K-1) of photovoltaic cell end of power P (K) and previous moment that obtains the photovoltaic cell end of described current time
|△ P
|
Step C: judge described power absolute value
|△ P
|Whether greater than first preset value, if described power absolute value
|△ P
|Be less than or equal to described first preset value, then next carry out described steps A; If described power absolute value
|△ P
|Greater than described first preset value, execution in step D next then;
Step D: judge described power absolute value
|△ P
|Duty ratio adjustment step-length a(K-1 with previous moment) ratio
|△ P
|/A(K-1) whether greater than second preset value, if described power absolute value
|△ P
|Duty ratio adjustment step-length a(K-1 with previous moment) ratio
|△ P
|/A(K-1) be less than or equal to described second preset value, then execution in step E ' next; If described power absolute value
|△ P
|Duty ratio adjustment step-length a(K-1 with previous moment) ratio
|△ P
|/A(K-1) greater than described second preset value, execution in step E next then;
Step e ': adopt self-adapting hill climbing method to set next duty ratio D(K+1 constantly), return described steps A then;
Step e: the voltage V(K that judges the photovoltaic cell end of described current time) whether greater than the maximum voltage threshold value, if the voltage V(K of the photovoltaic cell end of described current time) be less than or equal to described maximum voltage threshold value, direction variable DI then be set be first on the occasion of; If greater than described maximum voltage threshold value, it is first negative value that direction variable DI then is set the voltage V(K of the photovoltaic cell end of described current time);
Step F: with described power absolute value
|△ P
|Duty ratio adjustment step-length a(K-1 with previous moment) ratio
|△ P
|/A(K-1) adjust step-length a(K with first product of adjusting parameter M as the duty ratio of current time);
Step G: the duty of described current time is adjusted step-length a(K) multiply by the product a(K of described direction variable DI) the duty ratio D(K of DI and current time) sum a(K) DI+D(K) as the duty ratio D(K+1 in next moment); Return described steps A then.
Preferably, the absolute value of described first negative value less than described first on the occasion of absolute value.
Preferably, described first on the occasion of absolute value be 3 ~ 6 times of absolute value of described first negative value.
Preferably, described first on the occasion of absolute value be 5 times of absolute value of described first negative value.
Preferably, the described maximum voltage threshold value maximum output voltage that is the photovoltaic cell two ends.
Preferably, first adjust parameter M for adjusting tracking accuracy.
The present invention near maximum power point, makes the tracking velocity of whole system accelerate by different step-lengths, has improved photoelectric conversion efficiency.
Description of drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 illustrates according to flow chart of the present invention.
Embodiment
Particularly, as described in Figure 1, execution in step S201 at first is according to the voltage V(K of the photovoltaic cell end of current time) calculate the power P (K) of the photovoltaic cell end of current time with electric current I (K); Be P(K)=V(K) I(K).
Execution in step S202 then obtains the power absolute value of power P (K) and the difference of the power P (K-1) of the photovoltaic cell end of previous moment of the photovoltaic cell end of described current time
|△ P
|, namely
|△ P
|=
|P(K)-P(K-1)
|.
Execution in step S203 judges described power absolute value then
|△ P
|Whether greater than first preset value, if described power absolute value
|△ P
|Be less than or equal to described first preset value, then next carry out described step S201; If described power absolute value
|△ P
|Greater than described first preset value, execution in step S204 next then.
By carrying out described step S204, judge described power absolute value
|△ P
|Duty ratio adjustment step-length a(K-1 with previous moment) ratio
|△ P
|/A(K-1) whether greater than second preset value, if described power absolute value
|△ P
|Duty ratio adjustment step-length a(K-1 with previous moment) ratio
|△ P
|/A(K-1) be less than or equal to described second preset value, then execution in step S205 next; If described power absolute value
|△ P
|Duty ratio adjustment step-length a(K-1 with previous moment) ratio
|△ P
|/A(K-1) greater than described second preset value, execution in step S206 next then.
By execution in step S206, judge the voltage V(K of the photovoltaic cell end of described current time) whether greater than the maximum voltage threshold value, if the voltage V(K of the photovoltaic cell end of described current time) be less than or equal to described maximum voltage threshold value, then by execution in step S207 arrange direction variable DI be first on the occasion of; If the voltage V(K of the photovoltaic cell end of described current time) greater than described maximum voltage threshold value, then direction variable DI is set is first negative value by carrying out described step S208.
Execution in step S209 then is with described power absolute value
|△ P
|Duty ratio adjustment step-length a(K-1 with previous moment) ratio
|△ P
|/A(K-1) adjust step-length a(K with first product of adjusting parameter M as the duty ratio of current time); Be a(K)=M
|△ P
|/A(K-1).
Execution in step S210 then adjusts step-length a(K with the duty of described current time) multiply by the product a(K of described direction variable DI) the duty ratio D(K of DI and current time) sum a(K) DI+D(K) as the duty ratio D(K+1 in next moment); Be D(K+1)=a(K) DI+D(K).Return described step S201 then.
In a preference of present embodiment, the absolute value of described first negative value less than described first on the occasion of absolute value, further preferably, described first on the occasion of absolute value be 3 ~ 6 times of absolute value of described first negative value, still more preferably, described first on the occasion of absolute value be 5 times of absolute value of described first negative value.Preferably, the described maximum voltage threshold value maximum output voltage that is the photovoltaic cell two ends.Preferably, first adjust parameter M for adjusting tracking accuracy.
More than specific embodiments of the invention are described.It will be appreciated that the present invention is not limited to above-mentioned specific implementations, those skilled in the art can make various distortion or modification within the scope of the claims, and this does not influence flesh and blood of the present invention.
Claims (6)
1. improve the control method of photoelectric conversion efficiency in the photovoltaic generating system, it is characterized in that, comprise the steps:
Steps A: according to the voltage V(K of the photovoltaic cell end of current time) calculates the power P (K) of the photovoltaic cell end of current time with electric current I (K);
Step B: the power absolute value of difference of power P (K-1) of photovoltaic cell end of power P (K) and previous moment that obtains the photovoltaic cell end of described current time | △ P|;
Step C: judge described power absolute value | whether △ P| is greater than first preset value, if described power absolute value | △ P| is less than or equal to described first preset value, then next carries out described steps A; If described power absolute value | △ P| is greater than described first preset value, then execution in step D next;
Step D: judge described power absolute value | the duty ratio of △ P| and previous moment is adjusted step-length a(K-1) ratio | △ P|/a(K-1) whether greater than second preset value, if described power absolute value | the duty ratio adjustment step-length a(K-1 of △ P| and previous moment) ratio | △ P|/a(K-1) be less than or equal to described second preset value, execution in step E ' next then; If described power absolute value | the duty ratio adjustment step-length a(K-1 of △ P| and previous moment) ratio | △ P|/a(K-1) greater than described second preset value, execution in step E next then;
Step e ': adopt self-adapting hill climbing method to set next duty ratio D(K+1 constantly), return described steps A then;
Step e: the voltage V(K that judges the photovoltaic cell end of described current time) whether greater than the maximum voltage threshold value, if the voltage V(K of the photovoltaic cell end of described current time) be less than or equal to described maximum voltage threshold value, direction variable DI then be set be first on the occasion of; If greater than described maximum voltage threshold value, it is first negative value that direction variable DI then is set the voltage V(K of the photovoltaic cell end of described current time);
Step F: with described power absolute value | the duty ratio of △ P| and previous moment is adjusted step-length a(K-1) ratio | △ P|/a(K-1) adjust step-length a(K with first product of adjusting parameter M as the duty ratio of current time);
Step G: the duty of described current time is adjusted step-length a(K) multiply by the product a(K of described direction variable DI) the duty ratio D(K of DI and current time) sum a(K) DI+D(K) as the duty ratio D(K+1 in next moment); Return described steps A then;
The absolute value of described first negative value less than described first on the occasion of absolute value.
2. improve the control method of photoelectric conversion efficiency in the photovoltaic generating system according to claim 1, it is characterized in that, described first on the occasion of absolute value be 3～6 times of absolute value of described first negative value.
3. improve the control method of photoelectric conversion efficiency in the photovoltaic generating system according to claim 2, it is characterized in that, described first on the occasion of absolute value be 5 times of absolute value of described first negative value.
4. according to the control method that improves photoelectric conversion efficiency in each described photovoltaic generating system in the claim 1 to 3, it is characterized in that described maximum voltage threshold value is the maximum output voltage at photovoltaic cell two ends.
5. according to the control method that improves photoelectric conversion efficiency in each described photovoltaic generating system in the claim 1 to 3, it is characterized in that first adjusts parameter M is used for adjusting tracking accuracy.
6. improve the control method of photoelectric conversion efficiency in the photovoltaic generating system according to claim 4, it is characterized in that, first adjusts parameter M is used for adjusting tracking accuracy.
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Owner name: SHANGHAI YOUTAI SILICON MATERIALS CO., LTD. Free format text: FORMER OWNER: UPSOLAR TECHNOLOGY (SHANGHAI) CO.,LTD. Effective date: 20150629 |
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Effective date of registration: 20150629 Address after: 200041, No. 71 West Suzhou Road, Shanghai, 9, Jingan District Patentee after: Shanghai excellent silicon material Co., Ltd. Address before: 200127 Shanghai Pudong New Area City asan Road No. 613, room 6 A607 Patentee before: Super solar technology (Shanghai) Co., Ltd. |
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