CN116627204A - Multimodal MPPT tracking control method and system for solar automobile - Google Patents
Multimodal MPPT tracking control method and system for solar automobile Download PDFInfo
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- CN116627204A CN116627204A CN202310385244.5A CN202310385244A CN116627204A CN 116627204 A CN116627204 A CN 116627204A CN 202310385244 A CN202310385244 A CN 202310385244A CN 116627204 A CN116627204 A CN 116627204A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims description 55
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- 230000006978 adaptation Effects 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 description 12
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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
Abstract
The invention provides a multimodal MPPT tracking control method and a multimodal MPPT tracking control system for a solar automobile, wherein the multimodal MPPT tracking control method comprises the following steps: setting zero drift compensation of a solar automobile photovoltaic detection element, obtaining initial single-board voltage, and setting initial power and initial duty ratio; according to the initial power and the initial duty ratio, setting the number of series modules through a system, and calculating to obtain a series open-circuit voltage; the relation between the control working voltage and the dynamic power change is analyzed through disturbance, and whether the maximum power point is reached is judged according to the relation between the control working voltage and the dynamic power change; and (3) keeping disturbance tracking of the operation point at the maximum power point, always preferentially selecting maximum power point data, adapting to a photovoltaic output characteristic curve under a local shielding condition, and carrying out multimodal MPPT tracking control.
Description
Technical Field
The invention relates to the technical field of new energy automobile precision detection, in particular to a multimodal MPPT tracking control method and system for a solar automobile.
Background
With the aggravation of environmental pollution and energy crisis, the development of solar automobiles is increasingly emphasized; however, the charging conversion effective utilization rate of the solar car needs to be improved, the effective output voltage of the solar power generation is influenced by the load current, and when the load current changes, the effective output voltage of the solar power generator also changes, so that the performance and the cruising ability of the solar car are affected; the solar energy charging system of the solar car still needs to meet the charging requirement of the car; the conversion efficiency of the current MPPT controller for tracking the maximum power point of the solar energy of the automobile is still required to be further improved; the MPPT tracking control accuracy and the system detection accuracy of the solar automobile are required to be improved; therefore, there is a need to provide a method and a system for tracking and controlling multimodal MPPT of a solar car, so as to at least partially solve the problems in the prior art.
Disclosure of Invention
A series of concepts in simplified form are introduced in the summary section, which will be described in further detail in the detailed description section; the summary of the invention is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
To at least partially solve the above problems, the present invention provides a method for tracking and controlling multimodal MPPT of a solar car, comprising:
s100: setting zero drift compensation of a solar automobile photovoltaic detection element, obtaining initial single-board voltage, and setting initial power and initial duty ratio;
s200: according to the initial power and the initial duty ratio, setting the number of series modules through a system, and calculating to obtain a series open-circuit voltage;
s300: the relation between the control working voltage and the dynamic power change is analyzed through disturbance, and whether the maximum power point is reached is judged according to the relation between the control working voltage and the dynamic power change;
s400: and (3) keeping disturbance tracking of the operation point at the maximum power point, always preferentially selecting maximum power point data, adapting to a photovoltaic output characteristic curve under a local shielding condition, and carrying out multimodal MPPT tracking control.
Preferably, S100 includes:
s101: setting zero drift compensation of a solar automobile photovoltaic detection element through drift suppression integral compensation;
s102: acquiring an initial open-circuit voltage in a fractional open-circuit voltage mode, and setting initial power and initial duty ratio; the initial power includes: the first initial power, the second initial power and the third initial power; the initial duty cycle includes: the first initial duty cycle, the second initial duty cycle, and the third initial duty cycle.
Preferably, S200 includes:
s201: initializing the initial power to a zero value according to the initial power and the initial duty cycle;
s202: setting the number of series modules when the initial power is initialized to a zero value;
s203: and obtaining the series open-circuit voltage through the product operation of the serial module number and the initial single-board voltage.
Preferably, S300 includes:
s301: controlling the relation between the working voltage and the dynamic power change through disturbance analysis;
s302: judging whether a maximum power point is reached or not according to the relation between the control working voltage and the dynamic power variation; determining whether the maximum power point is reached according to the relation between the control working voltage and the dynamic power variation, including: when the dynamic power change rate is larger than the control working voltage change rate, judging that the working point is at the left side of the maximum power point, and increasing the working voltage is needed; when the dynamic power change rate is smaller than the control working voltage change rate, judging that the working point is on the right of the maximum power point, and reducing the working voltage; when the dynamic power change rate is equal to the control operation voltage change rate, it is determined that the maximum power point is reached.
Preferably, S400 includes:
s401: maintaining the disturbance tracking of the operation point at the maximum power point; maintaining the operating point at the maximum power point disturbance tracking includes: the method comprises the steps of storing a first maximum power in a first initial power by tracking a first maximum power point, and obtaining a first temporary storage maximum power; the first temporary duty cycle is stored in the initial duty cycle; if the series open circuit voltage does not reach the maximum working voltage at the first maximum power point, continuing to search for the second maximum power point and increasing the reference voltage; step S300 is circularly executed, and disturbance tracking of the operation point near the maximum power point is kept;
s402: storing the conversion duty cycle and the conversion power of the converter as a second temporary conversion duty cycle and a second temporary conversion power; if the second temporary storage conversion power is larger than the first temporary storage maximum power, storing the first temporary storage maximum power and the first temporary storage duty ratio to a third initial power and a third initial duty ratio; storing the second temporary storage conversion power into the first initial power, and keeping the first initial power always store the maximum power point data;
s403: and the multimodal MPPT tracking control of the solar car is realized through the disturbance tracking of the maximum power point, the photovoltaic output characteristic curve under the local shielding condition is adapted, and the multimodal MPPT tracking control is performed.
The invention provides a multimodal MPPT tracking control system of a solar automobile, which comprises the following components:
drift compensation initial setting subsystem: setting zero drift compensation of a solar automobile photovoltaic detection element, obtaining initial single-board voltage, and setting initial power and initial duty ratio;
a series analysis voltage operation subsystem: according to the initial power and the initial duty ratio, setting the number of series modules through a system, and calculating to obtain a series open-circuit voltage;
disturbance analysis control decision subsystem: the relation between the control working voltage and the dynamic power change is analyzed through disturbance, and whether the maximum power point is reached is judged according to the relation between the control working voltage and the dynamic power change;
disturbance tracking occlusion adaptation subsystem: and (3) keeping disturbance tracking of the operation point at the maximum power point, always preferentially selecting maximum power point data, adapting to a photovoltaic output characteristic curve under a local shielding condition, and carrying out multimodal MPPT tracking control.
Preferably, the drift compensation initial setting subsystem includes:
open circuit voltage drift compensation subsystem: setting zero drift compensation of a solar automobile photovoltaic detection element through drift suppression integral compensation;
initial power duty cycle setting subsystem: acquiring an initial open-circuit voltage in a fractional open-circuit voltage mode, and setting initial power and initial duty ratio; the initial power includes: the first initial power, the second initial power and the third initial power; the initial duty cycle includes: the first initial duty cycle, the second initial duty cycle, and the third initial duty cycle.
Preferably, the series analysis voltage operation subsystem includes:
power initialization setup subsystem: initializing the initial power to a zero value according to the initial power and the initial duty cycle;
and a serial module setting subsystem: setting the number of series modules when the initial power is initialized to a zero value;
open circuit voltage operation subsystem: and obtaining the series open-circuit voltage through the product operation of the serial module number and the initial single-board voltage.
Preferably, the disturbance analysis control determination subsystem includes:
voltage power disturbance analysis subsystem: controlling the relation between the working voltage and the dynamic power change through disturbance analysis;
maximum power point determination subsystem: judging whether a maximum power point is reached or not according to the relation between the control working voltage and the dynamic power variation; determining whether the maximum power point is reached according to the relation between the control working voltage and the dynamic power variation, including: when the dynamic power change rate is larger than the control working voltage change rate, judging that the working point is at the left side of the maximum power point, and increasing the working voltage is needed; when the dynamic power change rate is smaller than the control working voltage change rate, judging that the working point is on the right of the maximum power point, and reducing the working voltage; when the dynamic power change rate is equal to the control operation voltage change rate, it is determined that the maximum power point is reached.
Preferably, the disturbance tracking occlusion adaptation subsystem comprises:
disturbance tracking and maintaining subsystem: maintaining the disturbance tracking of the operation point at the maximum power point; maintaining the operating point at the maximum power point disturbance tracking includes: the method comprises the steps of storing a first maximum power in a first initial power by tracking a first maximum power point, and obtaining a first temporary storage maximum power; the first temporary duty cycle is stored in the initial duty cycle; if the series open circuit voltage does not reach the maximum working voltage at the first maximum power point, continuing to search for the second maximum power point and increasing the reference voltage; step S300 is circularly executed, and disturbance tracking of the operation point near the maximum power point is kept;
and the data temporary storage and circulation judging subsystem is as follows: storing the conversion Duty ratio and the conversion power of the converter as a second temporary conversion Duty ratio Duty2 and a second temporary conversion power Pmpp2; if the second temporary storage conversion power is larger than the first temporary storage maximum power, storing the first temporary storage maximum power and the first temporary storage duty ratio to a third initial power and a third initial duty ratio; storing the second temporary storage conversion power into the first initial power, and keeping the first initial power always store the maximum power point data;
Local occlusion tracking control subsystem: and the multimodal MPPT tracking control of the solar car is realized through the disturbance tracking of the maximum power point, the photovoltaic output characteristic curve under the local shielding condition is adapted, and the multimodal MPPT tracking control is performed.
Compared with the prior art, the invention at least comprises the following beneficial effects:
the invention provides a multimodal MPPT tracking control method and a multimodal MPPT tracking control system for a solar automobile, which are characterized in that initial single-board voltage is obtained by setting zero drift compensation of a photovoltaic detection element of the solar automobile, and initial power and initial duty ratio are set; according to the initial power and the initial duty ratio, setting the number of series modules through a system, and calculating to obtain a series open-circuit voltage; the relation between the control working voltage and the dynamic power change is analyzed through disturbance, and whether the maximum power point is reached is judged according to the relation between the control working voltage and the dynamic power change; maintaining disturbance tracking of the operation point at a maximum power point, always preferentially selecting maximum power point data, adapting to a photovoltaic output characteristic curve under a local shielding condition, and performing multimodal MPPT tracking control; tracking the global maximum power point of the photovoltaic array to enable the photovoltaic cell to reach the maximum power point, adapting to the photovoltaic output characteristic curve under the local shielding condition, and performing multimodal MPPT tracking control characteristics; setting initial powers Pmpp1, pmpp2, and Pmpp3 and initial Duty ratios Duty1, duty2, and Duty3 by multimodal MPPT tracking control based on the fractional open circuit voltage FOCV; comprises setting initial values to zero respectively; setting a series module number Ns and an open circuit voltage Voc; tracking a first maximum power point through a disturbance observation algorithm; when dP > dU, the working point is at the left of the maximum power point, and the working voltage needs to be increased; when dP < dU, the working point is right to the maximum power point, and the working voltage needs to be reduced; when dp=du, the maximum power point is reached; when the first maximum power point is tracked, storing the Duty cycle and the maximum power in Duty1 and Pmpp 1; if Vmax is the product of Voc and has not reached the maximum value Ns, the algorithm will continue to search for the next maximum power point on the right; increasing a reference voltage; executing a maximum power point tracking subroutine to ensure that an operating point is subjected to disturbance tracking near the maximum power point; the Duty cycle and maximum power storage of the converter are Duty2 and Pmpp2; if Pmpp2 is greater than Pmpp1, then Pmpp1 and Duty1 are stored to Pmpp3 and Duty3; then, pmpp2 and Duty2 are stored into the memories of Pmpp1 and Duty1, keeping Pmpp1 always storing data of the maximum power point; the effective output voltage of solar power generation is influenced by load current, and when the load current changes, the effective output voltage of solar power generation also changes, so that the performance and cruising ability of the solar automobile are influenced; by designing a multimodal MPPT tracking control prototype of a solar automobile, the multimodal MPPT tracking control prototype is used in a certain solar automobile, and technical function verification in the application field of the solar automobile is performed; the invention improves the effective utilization rate of charging conversion of the solar car and reduces the influence degree of load current on the effective output voltage of solar power generation; the effective utilization rate of the solar automobile can be effectively improved, so that the performance and cruising ability of the solar automobile are improved; the invention can realize the maximum power point tracking of the solar automobile battery pack, improves the reliability and efficiency of the solar automobile battery pack, reduces the system loss and further improves the charging performance of the solar automobile.
Other advantages, objects, and features of the present invention will be in part apparent to those skilled in the art from consideration of the specification and practice of the invention as set forth herein.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
fig. 1 is a step diagram of a multimodal MPPT tracking control method for a solar car according to the present invention.
Fig. 2 is a block diagram of a multimodal MPPT tracking control system for a solar car according to the present invention
Fig. 3 is a flowchart of an embodiment of a multimodal MPPT tracking control method for a solar car according to the present invention.
Fig. 4 is a flowchart of an embodiment of multimodal MPPT tracking control disturbance observation for a solar car according to the present invention.
Fig. 5 is a waveform diagram of an experiment of a dynamic tracking effect of multimodal MPPT tracking control of a solar car according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to the drawings and examples to enable those skilled in the art to practice the same and to refer to the description; as shown in fig. 1-5, the invention provides a multimodal MPPT tracking control method for a solar car, comprising:
S100: setting zero drift compensation of a solar automobile photovoltaic detection element, obtaining initial single-board voltage, and setting initial power and initial duty ratio;
s200: according to the initial power and the initial duty ratio, setting the number of series modules through a system, and calculating to obtain a series open-circuit voltage;
s300: the relation between the control working voltage and the dynamic power change is analyzed through disturbance, and whether the maximum power point is reached is judged according to the relation between the control working voltage and the dynamic power change;
s400: and (3) keeping disturbance tracking of the operation point at the maximum power point, always preferentially selecting maximum power point data, adapting to a photovoltaic output characteristic curve under a local shielding condition, and carrying out multimodal MPPT tracking control.
The working principle and the effect of the technical scheme are as follows: the invention provides a multimodal MPPT tracking control method of a solar automobile, which comprises the following steps: setting zero drift compensation of a solar automobile photovoltaic detection element, obtaining initial single-board voltage, and setting initial power and initial duty ratio; according to the initial power and the initial duty ratio, setting the number of series modules through a system, and calculating to obtain a series open-circuit voltage; the relation between the control working voltage and the dynamic power change is analyzed through disturbance, and whether the maximum power point is reached is judged according to the relation between the control working voltage and the dynamic power change; maintaining disturbance tracking of the operation point at a maximum power point, always preferentially selecting maximum power point data, adapting to a photovoltaic output characteristic curve under a local shielding condition, and performing multimodal MPPT tracking control; tracking the global maximum power point of the photovoltaic array to enable the photovoltaic cell to reach the maximum power point, adapting to the photovoltaic output characteristic curve under the local shielding condition, and performing multimodal MPPT tracking control characteristics; setting initial powers Pmpp1, pmpp2, and Pmpp3 and initial Duty ratios Duty1, duty2, and Duty3 by multimodal MPPT tracking control based on the fractional open circuit voltage FOCV; comprises setting initial values to zero respectively; setting a series module number Ns and an open circuit voltage Voc; tracking a first maximum power point through a disturbance observation algorithm; when dP > dU, the working point is at the left of the maximum power point, and the working voltage needs to be increased; when dP < dU, the working point is right to the maximum power point, and the working voltage needs to be reduced; when dp=du, the maximum power point is reached; when the first maximum power point is tracked, storing the Duty cycle and the maximum power in Duty1 and Pmpp 1; if Vmax is the product of Voc and has not reached the maximum value Ns, the algorithm will continue to search for the next maximum power point on the right; increasing a reference voltage; executing a maximum power point tracking subroutine to ensure that an operating point is subjected to disturbance tracking near the maximum power point; the Duty cycle and maximum power storage of the converter are Duty2 and Pmpp2; if Pmpp2 is greater than Pmpp1, then Pmpp1 and Duty1 are stored to Pmpp3 and Duty3; then, pmpp2 and Duty2 are stored into the memories of Pmpp1 and Duty1, keeping Pmpp1 always storing data of the maximum power point; the effective output voltage of solar power generation is influenced by load current, and when the load current changes, the effective output voltage of solar power generation also changes, so that the performance and cruising ability of the solar automobile are influenced; by designing a multimodal MPPT tracking control prototype of a solar automobile, the multimodal MPPT tracking control prototype is used in a certain solar automobile, and technical function verification in the application field of the solar automobile is performed; the invention improves the effective utilization rate of charging conversion of the solar car and reduces the influence degree of load current on the effective output voltage of solar power generation; the effective utilization rate of the solar automobile can be effectively improved, so that the performance and cruising ability of the solar automobile are improved; the invention can realize the maximum power point tracking of the solar automobile battery pack, improves the reliability and efficiency of the solar automobile battery pack, reduces the system loss and further improves the charging performance of the solar automobile.
In one embodiment, S100 comprises:
s101: setting zero drift compensation of a solar automobile photovoltaic detection element through drift suppression integral compensation;
s102: acquiring an initial open-circuit voltage in a fractional open-circuit voltage mode, and setting initial power and initial duty ratio;
the initial power includes: the first initial power, the second initial power and the third initial power; the initial duty cycle includes: the first initial duty cycle, the second initial duty cycle, and the third initial duty cycle.
The working principle and the effect of the technical scheme are as follows: setting zero drift compensation of a solar automobile photovoltaic detection element through drift suppression integral compensation; acquiring an initial open-circuit voltage in a fractional open-circuit voltage mode, and setting initial power and initial duty ratio; the initial power includes: the first initial power, the second initial power and the third initial power; the initial duty cycle includes: a first initial duty cycle, a second initial duty cycle, and a third initial duty cycle; calculating a drift suppression integral compensation current value:
wherein BCNInn represents a drift suppression integral compensation current value, SCo represents a drift suppression integral compensation coefficient, N represents an integral compensation process total integral period, no represents an integral start period, CNIo represents an initial current value, CNIm represents an M-order harmonic current amplitude, M represents a harmonic maximum frequency multiplication number, sin represents sinusoidal calculation, pi represents a circumference value, f represents an M-order harmonic frequency value, gm represents an M-order harmonic initial phase, and N represents an integral variable; the zero drift compensation setting of the solar automobile photovoltaic detection element is more accurate by calculating the drift suppression integral compensation current value.
In one embodiment, S200 includes:
s201: initializing the initial power to a zero value according to the initial power and the initial duty cycle;
s202: setting the number of series modules when the initial power is initialized to a zero value;
s203: and obtaining the series open-circuit voltage through the product operation of the serial module number and the initial single-board voltage.
The working principle and the effect of the technical scheme are as follows: initializing the initial power to a zero value according to the initial power and the initial duty cycle; setting the number of series modules when the initial power is initialized to a zero value; obtaining a series open-circuit voltage through the product operation of the number of series modules and the initial single-board voltage; setting initial powers Pmpp1, pmpp2, and Pmpp3 and initial Duty ratios Duty1, duty2, and Duty3 by multimodal MPPT tracking control based on the fractional open circuit voltage FOCV; comprises setting initial values to zero respectively; the multi-peak MPPT tracking control can be more accurate.
In one embodiment, S300 includes:
s301: controlling the relation between the working voltage and the dynamic power change through disturbance analysis;
s302: judging whether a maximum power point is reached or not according to the relation between the control working voltage and the dynamic power variation; determining whether the maximum power point is reached according to the relation between the control working voltage and the dynamic power variation, including: when the dynamic power change rate is larger than the control working voltage change rate, judging that the working point is at the left side of the maximum power point, and increasing the working voltage is needed; when the dynamic power change rate is smaller than the control working voltage change rate, judging that the working point is on the right of the maximum power point, and reducing the working voltage; when the dynamic power change rate is equal to the control operation voltage change rate, it is determined that the maximum power point is reached.
The working principle and the effect of the technical scheme are as follows: controlling the relation between the working voltage and the dynamic power change through disturbance analysis; judging whether a maximum power point is reached or not according to the relation between the control working voltage and the dynamic power variation; determining whether the maximum power point is reached according to the relation between the control working voltage and the dynamic power variation, including: when the dynamic power change rate is larger than the control working voltage change rate, judging that the working point is at the left side of the maximum power point, and increasing the working voltage is needed; when the dynamic power change rate is smaller than the control working voltage change rate, judging that the working point is on the right of the maximum power point, and reducing the working voltage; when the dynamic power change rate is equal to the control working voltage change rate, judging that the maximum power point is reached; setting a series module number Ns and an open circuit voltage Voc; tracking a first maximum power point through a disturbance observation algorithm; when dP > dU, the working point is at the left of the maximum power point, and the working voltage needs to be increased; when dP < dU, the working point is right to the maximum power point, and the working voltage needs to be reduced; when dp=du, the maximum power point is reached; the charging conversion effective utilization rate of the solar car is improved, and the influence degree of load current on the effective output voltage of solar power generation is reduced.
In one embodiment, S400 includes:
s401: maintaining the disturbance tracking of the operation point at the maximum power point; maintaining the operating point at the maximum power point disturbance tracking includes: the method comprises the steps of storing a first maximum power in a first initial power by tracking a first maximum power point, and obtaining a first temporary storage maximum power; the first temporary duty cycle is stored in the initial duty cycle; if the series open circuit voltage does not reach the maximum working voltage at the first maximum power point, continuing to search for the second maximum power point and increasing the reference voltage; step S300 is circularly executed, and disturbance tracking of the operation point near the maximum power point is kept;
s402: storing the conversion duty cycle and the conversion power of the converter as a second temporary conversion duty cycle and a second temporary conversion power; if the second temporary storage conversion power is larger than the first temporary storage maximum power, storing the first temporary storage maximum power and the first temporary storage duty ratio to a third initial power and a third initial duty ratio; storing the second temporary storage conversion power into the first initial power, and keeping the first initial power always store the maximum power point data;
s403: and the multimodal MPPT tracking control of the solar car is realized through the disturbance tracking of the maximum power point, the photovoltaic output characteristic curve under the local shielding condition is adapted, and the multimodal MPPT tracking control is performed.
The working principle and the effect of the technical scheme are as follows: maintaining the disturbance tracking of the operation point at the maximum power point; maintaining the operating point at the maximum power point disturbance tracking includes: the method comprises the steps of storing a first maximum power in a first initial power by tracking a first maximum power point, and obtaining a first temporary storage maximum power; the first temporary duty cycle is stored in the initial duty cycle; if the series open circuit voltage does not reach the maximum working voltage at the first maximum power point, continuing to search for the second maximum power point and increasing the reference voltage; step S300 is circularly executed, and disturbance tracking of the operation point near the maximum power point is kept; storing the conversion duty cycle and the conversion power of the converter as a second temporary conversion duty cycle and a second temporary conversion power; if the second temporary storage conversion power is larger than the first temporary storage maximum power, storing the first temporary storage maximum power and the first temporary storage duty ratio to a third initial power and a third initial duty ratio; storing the second temporary storage conversion power into the first initial power, and keeping the first initial power always store the maximum power point data; the multimodal MPPT tracking control of the solar car is realized through the disturbance tracking of the maximum power point, the multimodal MPPT tracking control is adapted to the photovoltaic output characteristic curve under the local shielding condition, and the multimodal MPPT tracking control is carried out; when the first maximum power point is tracked, storing the Duty cycle and the maximum power in Duty1 and Pmpp 1; if Vmax is the product of Voc and has not reached the maximum value Ns, the algorithm will continue to search for the next maximum power point on the right; increasing a reference voltage; executing a maximum power point tracking subroutine to ensure that an operating point is subjected to disturbance tracking near the maximum power point; the Duty cycle and maximum power storage of the converter are Duty2 and Pmpp2; if Pmpp2 is greater than Pmpp1, then Pmpp1 and Duty1 are stored to Pmpp3 and Duty3; then, pmpp2 and Duty2 are stored into the memories of Pmpp1 and Duty1, keeping Pmpp1 always storing data of the maximum power point; the multimodal MPPT tracking control of the solar car is realized through the disturbance tracking of the maximum power point, the multimodal MPPT tracking control is adapted to the photovoltaic output characteristic curve under the local shielding condition, and the multimodal MPPT tracking control is carried out; the effective utilization rate of the solar automobile can be effectively improved, so that the performance and cruising ability of the solar automobile are improved; the invention can realize the maximum power point tracking of the solar automobile battery pack, improves the reliability and efficiency of the solar automobile battery pack, reduces the system loss and further improves the charging performance of the solar automobile.
The invention provides a multimodal MPPT tracking control system of a solar automobile, which comprises the following components:
drift compensation initial setting subsystem: setting zero drift compensation of a solar automobile photovoltaic detection element, obtaining initial single-board voltage, and setting initial power and initial duty ratio;
a series analysis voltage operation subsystem: according to the initial power and the initial duty ratio, setting the number of series modules through a system, and calculating to obtain a series open-circuit voltage;
disturbance analysis control decision subsystem: the relation between the control working voltage and the dynamic power change is analyzed through disturbance, and whether the maximum power point is reached is judged according to the relation between the control working voltage and the dynamic power change;
disturbance tracking occlusion adaptation subsystem: and (3) keeping disturbance tracking of the operation point at the maximum power point, always preferentially selecting maximum power point data, adapting to a photovoltaic output characteristic curve under a local shielding condition, and carrying out multimodal MPPT tracking control.
The working principle and the effect of the technical scheme are as follows: the invention provides a multimodal MPPT tracking control system of a solar automobile, which comprises the following components: drift compensation initial setting subsystem: setting zero drift compensation of a solar automobile photovoltaic detection element, obtaining initial single-board voltage, and setting initial power and initial duty ratio; a series analysis voltage operation subsystem: according to the initial power and the initial duty ratio, setting the number of series modules through a system, and calculating to obtain a series open-circuit voltage; disturbance analysis control decision subsystem: the relation between the control working voltage and the dynamic power change is analyzed through disturbance, and whether the maximum power point is reached is judged according to the relation between the control working voltage and the dynamic power change; disturbance tracking occlusion adaptation subsystem: maintaining disturbance tracking of the operation point at a maximum power point, always preferentially selecting maximum power point data, adapting to a photovoltaic output characteristic curve under a local shielding condition, and performing multimodal MPPT tracking control; setting initial powers Pmpp1, pmpp2, and Pmpp3 and initial Duty ratios Duty1, duty2, and Duty3 by multimodal MPPT tracking control based on the fractional open circuit voltage FOCV; comprises setting initial values to zero respectively; setting a series module number Ns and an open circuit voltage Voc; tracking a first maximum power point through a disturbance observation algorithm; when dP > dU, the working point is at the left of the maximum power point, and the working voltage needs to be increased; when dP < dU, the working point is right to the maximum power point, and the working voltage needs to be reduced; when dp=du, the maximum power point is reached; when the first maximum power point is tracked, storing the Duty cycle and the maximum power in Duty1 and Pmpp 1; if Vmax is the product of Voc and has not reached the maximum value Ns, the algorithm will continue to search for the next maximum power point on the right; increasing a reference voltage; executing a maximum power point tracking subroutine to ensure that an operating point is subjected to disturbance tracking near the maximum power point; the Duty cycle and maximum power storage of the converter are Duty2 and Pmpp2; if Pmpp2 is greater than Pmpp1, then Pmpp1 and Duty1 are stored to Pmpp3 and Duty3; then, pmpp2 and Duty2 are stored into the memories of Pmpp1 and Duty1, keeping Pmpp1 always storing data of the maximum power point; the effective output voltage of solar power generation is influenced by load current, and when the load current changes, the effective output voltage of solar power generation also changes, so that the performance and cruising ability of the solar automobile are influenced; by designing a multimodal MPPT tracking control prototype of a solar automobile, the multimodal MPPT tracking control prototype is used in a certain solar automobile, and technical function verification in the application field of the solar automobile is performed; the invention improves the effective utilization rate of charging conversion of the solar car and reduces the influence degree of load current on the effective output voltage of solar power generation; the effective utilization rate of the solar automobile can be effectively improved, so that the performance and cruising ability of the solar automobile are improved; the invention can realize the maximum power point tracking of the solar automobile battery pack, improves the reliability and efficiency of the solar automobile battery pack, reduces the system loss and further improves the charging performance of the solar automobile.
In one embodiment, the drift compensation initial setup subsystem includes:
open circuit voltage drift compensation subsystem: setting zero drift compensation of a solar automobile photovoltaic detection element through drift suppression integral compensation;
initial power duty cycle setting subsystem: acquiring an initial open-circuit voltage in a fractional open-circuit voltage mode, and setting initial power and initial duty ratio; the initial power includes: the first initial power, the second initial power and the third initial power; the initial duty cycle includes: the first initial duty cycle, the second initial duty cycle, and the third initial duty cycle.
The working principle and the effect of the technical scheme are as follows: the drift compensation initial setting subsystem comprises: open circuit voltage drift compensation subsystem: setting zero drift compensation of a solar automobile photovoltaic detection element through drift suppression integral compensation; initial power duty cycle setting subsystem: acquiring an initial open-circuit voltage in a fractional open-circuit voltage mode, and setting initial power and initial duty ratio; the initial power includes: the first initial power, the second initial power and the third initial power; the initial duty cycle includes: a first initial duty cycle, a second initial duty cycle, and a third initial duty cycle; calculating a drift suppression integral compensation current value:
Wherein BCNInn represents a drift suppression integral compensation current value, SCo represents a drift suppression integral compensation coefficient, N represents an integral compensation process total integral period, no represents an integral start period, CNIo represents an initial current value, CNIm represents an M-order harmonic current amplitude, M represents a harmonic maximum frequency multiplication number, sin represents sinusoidal calculation, pi represents a circumference value, f represents an M-order harmonic frequency value, gm represents an M-order harmonic initial phase, and N represents an integral variable; the zero drift compensation setting of the solar automobile photovoltaic detection element is more accurate by calculating the drift suppression integral compensation current value.
In one embodiment, the series analysis voltage operation subsystem includes:
power initialization setup subsystem: initializing the initial power to a zero value according to the initial power and the initial duty cycle;
and a serial module setting subsystem: setting the number of series modules when the initial power is initialized to a zero value;
open circuit voltage operation subsystem: and obtaining the series open-circuit voltage through the product operation of the serial module number and the initial single-board voltage.
The working principle and the effect of the technical scheme are as follows: the series analysis voltage operation subsystem comprises: power initialization setup subsystem: initializing the initial power to a zero value according to the initial power and the initial duty cycle; and a serial module setting subsystem: setting the number of series modules when the initial power is initialized to a zero value; open circuit voltage operation subsystem: obtaining a series open-circuit voltage through the product operation of the number of series modules and the initial single-board voltage; setting initial powers Pmpp1, pmpp2, and Pmpp3 and initial Duty ratios Duty1, duty2, and Duty3 by multimodal MPPT tracking control based on the fractional open circuit voltage FOCV; comprises setting initial values to zero respectively; the multi-peak MPPT tracking control can be more accurate.
In one embodiment, the disturbance analysis control decision subsystem includes:
voltage power disturbance analysis subsystem: controlling the relation between the working voltage and the dynamic power change through disturbance analysis;
maximum power point determination subsystem: judging whether a maximum power point is reached or not according to the relation between the control working voltage and the dynamic power variation; determining whether the maximum power point is reached according to the relation between the control working voltage and the dynamic power variation, including: when the dynamic power change rate is larger than the control working voltage change rate, judging that the working point is at the left side of the maximum power point, and increasing the working voltage is needed; when the dynamic power change rate is smaller than the control working voltage change rate, judging that the working point is on the right of the maximum power point, and reducing the working voltage; when the dynamic power change rate is equal to the control operation voltage change rate, it is determined that the maximum power point is reached.
The working principle and the effect of the technical scheme are as follows: the disturbance analysis control judgment subsystem comprises: voltage power disturbance analysis subsystem: controlling the relation between the working voltage and the dynamic power change through disturbance analysis; maximum power point determination subsystem: judging whether a maximum power point is reached or not according to the relation between the control working voltage and the dynamic power variation; determining whether the maximum power point is reached according to the relation between the control working voltage and the dynamic power variation, including: when the dynamic power change rate is larger than the control working voltage change rate, judging that the working point is at the left side of the maximum power point, and increasing the working voltage is needed; when the dynamic power change rate is smaller than the control working voltage change rate, judging that the working point is on the right of the maximum power point, and reducing the working voltage; when the dynamic power change rate is equal to the control working voltage change rate, judging that the maximum power point is reached; setting a series module number Ns and an open circuit voltage Voc; tracking a first maximum power point through a disturbance observation algorithm; when dP > dU, the working point is at the left of the maximum power point, and the working voltage needs to be increased; when dP < dU, the working point is right to the maximum power point, and the working voltage needs to be reduced; when dp=du, the maximum power point is reached; the charging conversion effective utilization rate of the solar car is improved, and the influence degree of load current on the effective output voltage of solar power generation is reduced.
In one embodiment, the disturbance tracking occlusion adaptation subsystem includes:
disturbance tracking and maintaining subsystem: maintaining the disturbance tracking of the operation point at the maximum power point; maintaining the operating point at the maximum power point disturbance tracking includes: the method comprises the steps of storing a first maximum power in a first initial power by tracking a first maximum power point, and obtaining a first temporary storage maximum power; the first temporary duty cycle is stored in the initial duty cycle; if the series open circuit voltage does not reach the maximum working voltage at the first maximum power point, continuing to search for the second maximum power point and increasing the reference voltage; step S300 is circularly executed, and disturbance tracking of the operation point near the maximum power point is kept;
and the data temporary storage and circulation judging subsystem is as follows: storing the conversion Duty ratio and the conversion power of the converter as a second temporary conversion Duty ratio Duty2 and a second temporary conversion power Pmpp2; if the second temporary storage conversion power is larger than the first temporary storage maximum power, storing the first temporary storage maximum power and the first temporary storage duty ratio to a third initial power and a third initial duty ratio; storing the second temporary storage conversion power into the first initial power, and keeping the first initial power always store the maximum power point data;
Local occlusion tracking control subsystem: and the multimodal MPPT tracking control of the solar car is realized through the disturbance tracking of the maximum power point, the photovoltaic output characteristic curve under the local shielding condition is adapted, and the multimodal MPPT tracking control is performed.
The working principle and the effect of the technical scheme are as follows: the disturbance tracking occlusion adaptation subsystem comprises: disturbance tracking and maintaining subsystem: maintaining the disturbance tracking of the operation point at the maximum power point; maintaining the operating point at the maximum power point disturbance tracking includes: the method comprises the steps of storing a first maximum power in a first initial power by tracking a first maximum power point, and obtaining a first temporary storage maximum power; the first temporary duty cycle is stored in the initial duty cycle; if the series open circuit voltage does not reach the maximum working voltage at the first maximum power point, continuing to search for the second maximum power point and increasing the reference voltage; step S300 is circularly executed, and disturbance tracking of the operation point near the maximum power point is kept; and the data temporary storage and circulation judging subsystem is as follows: storing the conversion Duty ratio and the conversion power of the converter as a second temporary conversion Duty ratio Duty2 and a second temporary conversion power Pmpp2; if the second temporary storage conversion power is larger than the first temporary storage maximum power, storing the first temporary storage maximum power and the first temporary storage duty ratio to a third initial power and a third initial duty ratio; storing the second temporary storage conversion power into the first initial power, and keeping the first initial power always store the maximum power point data; local occlusion tracking control subsystem: the multimodal MPPT tracking control of the solar car is realized through the disturbance tracking of the maximum power point, the multimodal MPPT tracking control is adapted to the photovoltaic output characteristic curve under the local shielding condition, and the multimodal MPPT tracking control is carried out; when the first maximum power point is tracked, storing the Duty cycle and the maximum power in Duty1 and Pmpp 1; if Vmax is the product of Voc and has not reached the maximum value Ns, the algorithm will continue to search for the next maximum power point on the right; increasing a reference voltage; executing a maximum power point tracking subroutine to ensure that an operating point is subjected to disturbance tracking near the maximum power point; the Duty cycle and maximum power storage of the converter are Duty2 and Pmpp2; if Pmpp2 is greater than Pmpp1, then Pmpp1 and Duty1 are stored to Pmpp3 and Duty3; then, pmpp2 and Duty2 are stored into the memories of Pmpp1 and Duty1, keeping Pmpp1 always storing data of the maximum power point; the multimodal MPPT tracking control of the solar car is realized through the disturbance tracking of the maximum power point, the multimodal MPPT tracking control is adapted to the photovoltaic output characteristic curve under the local shielding condition, and the multimodal MPPT tracking control is carried out; the effective utilization rate of the solar automobile can be effectively improved, so that the performance and cruising ability of the solar automobile are improved; the invention can realize the maximum power point tracking of the solar automobile battery pack, improves the reliability and efficiency of the solar automobile battery pack, reduces the system loss and further improves the charging performance of the solar automobile.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (10)
1. The method for tracking and controlling the multimodal MPPT of the solar automobile is characterized by comprising the following steps of:
s100: setting zero drift compensation of a solar automobile photovoltaic detection element, obtaining initial single-board voltage, and setting initial power and initial duty ratio;
s200: according to the initial power and the initial duty ratio, setting the number of series modules through a system, and calculating to obtain a series open-circuit voltage;
s300: the relation between the control working voltage and the dynamic power change is analyzed through disturbance, and whether the maximum power point is reached is judged according to the relation between the control working voltage and the dynamic power change;
s400: and (3) keeping disturbance tracking of the operation point at the maximum power point, always preferentially selecting maximum power point data, adapting to a photovoltaic output characteristic curve under a local shielding condition, and carrying out multimodal MPPT tracking control.
2. The method for tracking and controlling the multimodal MPPT of a solar car according to claim 1, wherein S100 comprises:
s101: setting zero drift compensation of a solar automobile photovoltaic detection element through drift suppression integral compensation;
s102: acquiring an initial open-circuit voltage in a fractional open-circuit voltage mode, and setting initial power and initial duty ratio;
the initial power includes: the first initial power, the second initial power and the third initial power; the initial duty cycle includes: the first initial duty cycle, the second initial duty cycle, and the third initial duty cycle.
3. The method for tracking and controlling the multimodal MPPT of a solar car according to claim 1, wherein S200 comprises:
s201: initializing the initial power to a zero value according to the initial power and the initial duty cycle;
s202: setting the number of series modules when the initial power is initialized to a zero value;
s203: and obtaining the series open-circuit voltage through the product operation of the serial module number and the initial single-board voltage.
4. The method for tracking and controlling the multimodal MPPT of a solar car according to claim 1, wherein S300 comprises:
s301: controlling the relation between the working voltage and the dynamic power change through disturbance analysis;
S302: judging whether a maximum power point is reached or not according to the relation between the control working voltage and the dynamic power variation; determining whether the maximum power point is reached according to the relation between the control working voltage and the dynamic power variation, including: when the dynamic power change rate is larger than the control working voltage change rate, judging that the working point is at the left side of the maximum power point, and increasing the working voltage is needed; when the dynamic power change rate is smaller than the control working voltage change rate, judging that the working point is on the right of the maximum power point, and reducing the working voltage; when the dynamic power change rate is equal to the control operation voltage change rate, it is determined that the maximum power point is reached.
5. The method for tracking and controlling the multimodal MPPT of a solar car according to claim 1, wherein S400 comprises:
s401: maintaining the disturbance tracking of the operation point at the maximum power point; maintaining the operating point at the maximum power point disturbance tracking includes: the method comprises the steps of storing a first maximum power in a first initial power by tracking a first maximum power point, and obtaining a first temporary storage maximum power; the first temporary duty cycle is stored in the initial duty cycle; if the series open circuit voltage does not reach the maximum working voltage at the first maximum power point, continuing to search for the second maximum power point and increasing the reference voltage; step S300 is circularly executed, and disturbance tracking of the operation point near the maximum power point is kept;
S402: storing the conversion duty cycle and the conversion power of the converter as a second temporary conversion duty cycle and a second temporary conversion power; if the second temporary storage conversion power is larger than the first temporary storage maximum power, storing the first temporary storage maximum power and the first temporary storage duty ratio to a third initial power and a third initial duty ratio; storing the second temporary storage conversion power into the first initial power, and keeping the first initial power always store the maximum power point data;
s403: and the multimodal MPPT tracking control of the solar car is realized through the disturbance tracking of the maximum power point, the photovoltaic output characteristic curve under the local shielding condition is adapted, and the multimodal MPPT tracking control is performed.
6. A solar car multimodal MPPT tracking control system, comprising:
drift compensation initial setting subsystem: setting zero drift compensation of a solar automobile photovoltaic detection element, obtaining initial single-board voltage, and setting initial power and initial duty ratio;
a series analysis voltage operation subsystem: according to the initial power and the initial duty ratio, setting the number of series modules through a system, and calculating to obtain a series open-circuit voltage;
disturbance analysis control decision subsystem: the relation between the control working voltage and the dynamic power change is analyzed through disturbance, and whether the maximum power point is reached is judged according to the relation between the control working voltage and the dynamic power change;
Disturbance tracking occlusion adaptation subsystem: and (3) keeping disturbance tracking of the operation point at the maximum power point, always preferentially selecting maximum power point data, adapting to a photovoltaic output characteristic curve under a local shielding condition, and carrying out multimodal MPPT tracking control.
7. A solar car multimodal MPPT tracking control system as defined in claim 6 wherein the drift compensation initial setup subsystem comprises:
open circuit voltage drift compensation subsystem: setting zero drift compensation of a solar automobile photovoltaic detection element through drift suppression integral compensation;
initial power duty cycle setting subsystem: acquiring an initial open-circuit voltage in a fractional open-circuit voltage mode, and setting initial power and initial duty ratio; the initial power includes: the first initial power, the second initial power and the third initial power; the initial duty cycle includes: the first initial duty cycle, the second initial duty cycle, and the third initial duty cycle.
8. A solar car multimodal MPPT tracking control system as set forth in claim 6 wherein the series analysis voltage calculation subsystem comprises:
power initialization setup subsystem: initializing the initial power to a zero value according to the initial power and the initial duty cycle;
And a serial module setting subsystem: setting the number of series modules when the initial power is initialized to a zero value;
open circuit voltage operation subsystem: and obtaining the series open-circuit voltage through the product operation of the serial module number and the initial single-board voltage.
9. A solar car multimodal MPPT tracking control system as set forth in claim 6 wherein the disturbance analysis control decision subsystem comprises:
voltage power disturbance analysis subsystem: controlling the relation between the working voltage and the dynamic power change through disturbance analysis;
maximum power point determination subsystem: judging whether a maximum power point is reached or not according to the relation between the control working voltage and the dynamic power variation; determining whether the maximum power point is reached according to the relation between the control working voltage and the dynamic power variation, including: when the dynamic power change rate is larger than the control working voltage change rate, judging that the working point is at the left side of the maximum power point, and increasing the working voltage is needed; when the dynamic power change rate is smaller than the control working voltage change rate, judging that the working point is on the right of the maximum power point, and reducing the working voltage; when the dynamic power change rate is equal to the control operation voltage change rate, it is determined that the maximum power point is reached.
10. A solar car multimodal MPPT tracking control system as set forth in claim 6 wherein the disturbance tracking occlusion adaptation subsystem comprises:
disturbance tracking and maintaining subsystem: maintaining the disturbance tracking of the operation point at the maximum power point; maintaining the operating point at the maximum power point disturbance tracking includes: the method comprises the steps of storing a first maximum power in a first initial power by tracking a first maximum power point, and obtaining a first temporary storage maximum power; the first temporary duty cycle is stored in the initial duty cycle; if the series open circuit voltage does not reach the maximum working voltage at the first maximum power point, continuing to search for the second maximum power point and increasing the reference voltage; step S300 is circularly executed, and disturbance tracking of the operation point near the maximum power point is kept;
and the data temporary storage and circulation judging subsystem is as follows: storing the conversion Duty ratio and the conversion power of the converter as a second temporary conversion Duty ratio Duty2 and a second temporary conversion power Pmpp2; if the second temporary storage conversion power is larger than the first temporary storage maximum power, storing the first temporary storage maximum power and the first temporary storage duty ratio to a third initial power and a third initial duty ratio; storing the second temporary storage conversion power into the first initial power, and keeping the first initial power always store the maximum power point data;
Local occlusion tracking control subsystem: and the multimodal MPPT tracking control of the solar car is realized through the disturbance tracking of the maximum power point, the photovoltaic output characteristic curve under the local shielding condition is adapted, and the multimodal MPPT tracking control is performed.
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