CN113625821B - Dynamic MPPT control method - Google Patents
Dynamic MPPT control method Download PDFInfo
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- CN113625821B CN113625821B CN202110907433.5A CN202110907433A CN113625821B CN 113625821 B CN113625821 B CN 113625821B CN 202110907433 A CN202110907433 A CN 202110907433A CN 113625821 B CN113625821 B CN 113625821B
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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
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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 relates to a dynamic MPPT control method, which is used for controlling a photovoltaic panel to realize MPPT when the change speed of illumination intensity exceeds a set speed threshold value, and comprises the following steps: when the dynamic MPPT control is performed, the power generation power of the photovoltaic panel is detected, and the output voltage of the photovoltaic panel is adjusted according to the change of the power generation power of the photovoltaic panel, so that the MPPT is realized. When the generated power of the photovoltaic panel becomes large, the output voltage of the photovoltaic panel is regulated to the right; when the generated power of the photovoltaic panel is reduced, the output voltage of the photovoltaic panel is adjusted to the left. And adjusting the output voltage of the photovoltaic panel by adopting a variable step strategy. The step size adopted when the output voltage of the photovoltaic panel is regulated is reduced along with the reduction of the change speed of the illumination intensity, and is increased along with the increase of the change speed of the illumination intensity. The invention can realize MPPT of the photovoltaic panel when the illumination intensity changes rapidly, thereby solving the problem of low dynamic MPPT efficiency.
Description
Technical Field
The invention belongs to the technical field of new energy power generation, and particularly relates to a dynamic MPPT control method.
Background
In a photovoltaic power generation system, a Maximum Power Point Tracking (MPPT) technology is adopted to solve the problem of low photovoltaic power generation efficiency.
In the current commonly used MPPT control method, a three-point method is also called a hysteresis comparison method, and is a tracking method proposed on the basis of a disturbance observation method, and the basic principle is as follows: the current operating voltage point is set as a reference point B, the point A is an operating voltage point which reduces DeltaU on the basis of the point B, and the point C is an operating voltage point which increases DeltaU on the basis of the point B. Introducing a state variable M, wherein if the power of the point C is greater than or equal to that of the point B, the M is positive, otherwise, the M is negative; if the point A power is less than the point B power, M is positive, otherwise it is negative. When M has two positive output voltages, the output voltage is reduced when M has two negative output voltages, and when M is zero, the output voltage is unchanged, and the point B is regarded as the maximum power point.
The maximum power point accessory shown in fig. 1 may be in a situation that when the light intensity is suddenly changed, the arrangement mode of the lower half part in fig. 1 is generated, and for this situation, a scheme of not moving a voltage working point and tracking after the illumination is stable is adopted in the prior art.
From the above analysis, the prior art does not move the voltage operating point when the illumination changes rapidly, but this also causes a new problem, and the actual MPPT voltage point when the illumination changes rapidly causes the following two problems:
(1) When the illumination is enhanced rapidly, the MPPT voltage point of the illumination is required to move rapidly to the right in the initial stage of illumination enhancement, and the actual voltage working point is deviated to the left relative to the MPPT voltage point and is in a state of always deviating to the left;
(2) When the illumination is weakened rapidly, the MPPT voltage point of the device is required to be moved left gradually and moved left rapidly along with the illumination weakening to a low-power working condition, and the actual voltage working point is deviated to the right relative to the MPPT voltage point when the illumination weakening.
Therefore, the following problems exist in the existing three-point tracking MPPT under the condition of dynamic MPPT, namely, when the illumination is rapidly increased or reduced:
(1) When the illumination is rapidly enhanced, the actual voltage working point is left offset relative to the MPPT voltage point;
(2) When the illumination is weakened rapidly, the actual voltage working point is deviated to the right relative to the MPPT voltage point;
(3) As the rate of illumination enhancement or reduction increases, dynamic MPPT efficiency may be affected, which decreases as the rate of illumination change increases. The effect on dynamic MPPT efficiency is particularly pronounced when the illumination is reduced to low power conditions, or when the illumination is increased from low power conditions to a relatively high power.
Disclosure of Invention
The invention aims to provide a dynamic MPPT control method which is suitable for MPPT when the illumination intensity changes rapidly so as to improve the photovoltaic power generation efficiency.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a dynamic MPPT control method for control photovoltaic panel realizes MPPT when illumination intensity change speed exceeds the speed threshold value of settlement, dynamic MPPT control method does: and when the dynamic MPPT control is performed, detecting the power generation power of the photovoltaic panel, and adjusting the output voltage of the photovoltaic panel according to the change of the power generation power of the photovoltaic panel so as to realize the MPPT.
When the generated power of the photovoltaic panel becomes large, the output voltage of the photovoltaic panel is regulated rightward; and when the generated power of the photovoltaic panel is reduced, adjusting the output voltage of the photovoltaic panel leftwards.
And adjusting the output voltage of the photovoltaic panel by adopting a variable step strategy.
The step size adopted when the output voltage of the photovoltaic panel is regulated is reduced along with the reduction of the change speed of the illumination intensity, and is increased along with the increase of the change speed of the illumination intensity.
Judging whether the condition of entering the dynamic MPPT is met according to the difference value of the power generation power of the photovoltaic panel in the two adjacent MPPT periods, and if so, performing dynamic MPPT control.
And when the difference value of the generated power of the photovoltaic panel in the two adjacent MPPT periods is larger than a set power threshold value, the condition of entering the dynamic MPPT is met.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention can realize MPPT of the photovoltaic panel when the illumination intensity changes rapidly, thereby solving the problem of low dynamic MPPT efficiency.
Drawings
FIG. 1 is a schematic diagram of a situation in which a maximum power point accessory may occur when a three-point method is used.
Fig. 2 is a corresponding photovoltaic power generation power change curve when the illumination intensity is changed.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
Embodiment one: when the illumination is rapidly enhanced or weakened, the power corresponding to the MPPT of the photovoltaic panel is uniformly changed, based on a three-point method, when the illumination intensity is gradually enhanced, as shown in a figure 2, the change of a power difference value is necessarily caused, because the power change is theoretically uniform, the power change difference value is nearly unchanged near the MPPT, and the power change difference value is changed towards the opposite trend towards the left and right, so that the voltage working point is dynamically adjusted to be stabilized near the MPPT.
Based on the principle, a feasible method is provided for the dynamic MPPT when the illumination intensity is rapidly changed, and the method comprises the following steps:
the utility model provides a dynamic MPPT control method, is used for when illumination intensity change speed exceeds the speed threshold value of settlement (namely when illumination intensity changes fast) control photovoltaic panel realizes MPPT, this dynamic MPPT control method is: when the dynamic MPPT control is performed, the power generation power of the photovoltaic panel is detected, and the output voltage of the photovoltaic panel is adjusted according to the change of the power generation power of the photovoltaic panel, so that the MPPT is realized.
In implementing the above method, static MPPT and dynamic MPPT are first distinguished. Whether the condition of entering the dynamic MPPT is met or not can be judged according to the difference value of the power generation power of the photovoltaic panel in the two adjacent MPPT periods, and if so, the dynamic MPPT control is performed. And when the difference value of the generated power of the photovoltaic panels in the two adjacent MPPT periods is larger than a set power threshold value, the condition of entering the dynamic MPPT is met.
When the dynamic MPPT control is carried out, the special judgment logic is adopted to dynamically adjust the MPPT so that the working voltage is stabilized near the MPPT. When the generated power of the photovoltaic panel becomes larger, the output voltage of the photovoltaic panel is regulated to the right, namely, the output voltage of the photovoltaic panel is increased; when the generated power of the photovoltaic panel is reduced, the output voltage of the photovoltaic panel is adjusted to the left, namely, the output voltage of the photovoltaic panel is reduced. The adjustment amount Δu of the output voltage of the photovoltaic panel is determined according to the number of times the generated power of the photovoltaic panel is determined to be increased or decreased, that is, the adjustment amount Δu of the output voltage of the photovoltaic panel is increased each time as the number of times the generated power of the photovoltaic panel is determined to be increased or decreased is gradually increased.
When the output voltage of the photovoltaic panel is regulated, different change speeds exist when the illumination is enhanced or weakened from a low-power working condition, and in order to better track the MPPT, a variable step strategy is adopted to regulate the output voltage of the photovoltaic panel so as to achieve a better effect. The step size adopted when the output voltage of the photovoltaic panel is regulated is reduced along with the reduction of the change speed of the illumination intensity, and is increased along with the increase of the change speed of the illumination intensity. When the change speed of the illumination intensity reaches a certain limit value, the maximum step length is directly adopted.
The prior art cannot well meet the requirement of tracking MPPT under the condition of rapid enhancement or weakening of illumination, so that the dynamic MPPT efficiency is low. The scheme is used for specifically judging and distinguishing the dynamic MPPT and the static MPPT according to the dynamic MPPT, and adjusting the voltage working point according to the power change in a targeted manner, so that the problem of low efficiency of the dynamic MPPT can be well solved.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (5)
1. A dynamic MPPT control method is characterized in that: the dynamic MPPT control method is used for controlling the photovoltaic panel to realize MPPT when the change speed of the illumination intensity exceeds a set speed threshold, and the dynamic MPPT control method comprises the following steps: when dynamic MPPT control is performed, detecting the power generation of a photovoltaic panel, and adjusting the output voltage of the photovoltaic panel according to the change of the power generation of the photovoltaic panel so as to realize MPPT; when the generated power of the photovoltaic panel becomes large, the output voltage of the photovoltaic panel is regulated rightward; when the generated power of the photovoltaic panel is reduced, the output voltage of the photovoltaic panel is adjusted leftwards, the adjustment amount delta U of the output voltage of the photovoltaic panel is determined according to the number of times the generated power of the photovoltaic panel is judged to be increased or reduced, and the adjustment amount delta U of the output voltage of the photovoltaic panel is increased every time along with the gradual increase of the number of times the generated power of the photovoltaic panel is judged to be increased or reduced.
2. The dynamic MPPT control method of claim 1, wherein: and adjusting the output voltage of the photovoltaic panel by adopting a variable step strategy.
3. The method for dynamic MPPT control of claim 2, wherein: the step size adopted when the output voltage of the photovoltaic panel is regulated is reduced along with the reduction of the change speed of the illumination intensity, and is increased along with the increase of the change speed of the illumination intensity.
4. The dynamic MPPT control method of claim 1, wherein: judging whether the condition of entering the dynamic MPPT is met according to the difference value of the power generation power of the photovoltaic panel in the two adjacent MPPT periods, and if so, performing dynamic MPPT control.
5. The dynamic MPPT control method of claim 4, wherein: and when the difference value of the generated power of the photovoltaic panel in the two adjacent MPPT periods is larger than a set power threshold value, the condition of entering the dynamic MPPT is met.
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| JP6048173B2 (en) * | 2013-01-30 | 2016-12-21 | 住友電気工業株式会社 | Maximum power point tracking control device, maximum power point tracking control method, and photovoltaic power generation system |
| TW201517191A (en) * | 2013-10-31 | 2015-05-01 | Univ St Johns | Maximum power point tracking method for solar cell |
| CN107017664B (en) * | 2017-06-08 | 2019-04-30 | 兰州理工大学 | A kind of wind and solar hybrid generating system maximum power timesharing tracking |
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