CN110318967B - Control method applied to solar power supply to realize maximum power tracking of water pump - Google Patents
Control method applied to solar power supply to realize maximum power tracking of water pump Download PDFInfo
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- CN110318967B CN110318967B CN201910589099.6A CN201910589099A CN110318967B CN 110318967 B CN110318967 B CN 110318967B CN 201910589099 A CN201910589099 A CN 201910589099A CN 110318967 B CN110318967 B CN 110318967B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/006—Solar operated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Computer Hardware Design (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a control method for realizing maximum power tracking of a water pump by applying solar power supply, belonging to the technical field of applying solar energy to the water pump. It includes solar cell panel, water pump and is used for controlling the control module of motor operation on the water pump, just control module respectively with solar cell panel and water pump electric connection, control module is the MPPT module. The solar cell panel has high utilization rate, the average energy can reach more than 98 percent, and the output capacity of the solar cell panel can be automatically tracked within the motor capacity range by more than 98 percent; the control fluctuation is small, the support voltage range is wide, and the normal operation can be supported between DC50V and 500V; the maximum power is controlled and tracked through the input power of the motor, and the logic is simple.
Description
Technical Field
The invention relates to a control method for realizing maximum power tracking of a water pump by applying solar power supply, belonging to the technical field of applying solar energy to the water pump.
Background
In countries and regions with scarce water resources, people have the problem of difficult use of domestic water, and the conventional method is to use a water pump to solve the problem of pumping underground water. However, these countries and regions often have a power supply problem at the same time, and at present, the problem of power supply of the water pump can be solved mainly by adopting a solar power supply mode, but at present, the solar power supply often needs various conversions to be used by the electric appliances, for example, a storage battery, a direct current inverter and the like need to be connected in the middle, so that the solar energy utilization rate is seriously reduced, and the maintenance cost is increased.
Based on the problems, the maximum power tracking technology based on the variable frequency motor is particularly provided. The technology can cancel the intermediate power conversion part, and can achieve the energy utilization rate of more than 99 percent under the condition of reasonable matching of the power levels of the solar panel and the water pump, thereby fully utilizing the performance of the solar panel.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the control method is applied to a solar power supply to realize the maximum power tracking of the water pump, and solves the problems that the solar energy utilization rate is seriously reduced and the maintenance cost is increased because various conversions are often required to be used by electric appliances in the conventional solar power supply.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the utility model provides a control method for be applied to solar power source and realize maximum power point tracking of water pump, includes solar cell panel, water pump and is used for controlling the control module of motor operation on the water pump, and control module respectively with solar cell panel and water pump electric connection, control module is the MPPT module, and concrete control mode is as follows:
s1, firstly, the water pump controller judges whether the solar energy direct current input is available, if not, the water pump controller operates according to a fixed rotating speed, if so, the MPPT module is initialized, and the output power P0 of the controller is calculated;
s2, judging whether the MPPT module is in a PFC pump voltage mode, if so, judging whether the output power P0 of the controller is larger than the calculated power P1 of the water pump in the last operation, and if not, judging whether the output power P0 of the controller is larger than the calculated power P1 of the water pump in the last operation;
s3, on the basis of S2, when the current MPPT module is judged to be in the PFC pump voltage mode, whether the output power P0 of the controller is larger than the calculated power P1 of the water pump in the last operation is judged, if yes, whether the last adjustment is the increase of the PFC duty ratio is judged, and if not, whether the last adjustment is the increase of the PFC duty ratio is also judged;
s4, on the basis of S3, when the controller output power P0 is judged to be the condition which is larger than the calculated power P1 of the water pump at the last operation time, and the last adjustment is judged to be the condition that the PFC duty ratio is increased, the PFC duty cycle is increased by d1 and the current calculated power is saved, the duty cycle adjustment direction is saved, and recalculates the controller output power P0, if the previous adjustment was not for an increased PFC duty cycle condition, then, whether the PFC duty ratio reaches the minimum value or not needs to be judged, if the PFC duty ratio reaches the minimum value, the mode is switched to the PWM duty ratio mode of the motor to wait for the next judgment, and saves the current calculated power, saves the duty ratio adjustment direction, and recalculates the controller output power P0, if the minimum value is not reached, at the moment, the PFC duty ratio is reduced by d1, the current calculated power is saved, the duty ratio adjustment direction is saved, and the controller output power P0 is recalculated;
s5, on the basis of S3, when the controller output power P0 is judged not to be larger than the calculated power P1 of the water pump at the last operation time, and the last adjustment is judged not to be the condition of PFC duty ratio increase, the PFC duty cycle is increased by d1 and the current calculated power is saved, the duty cycle adjustment direction is saved, and recalculates the controller output power P0, if the last adjustment is determined to be under the condition of increasing PFC duty ratio, then judging whether the PFC duty ratio reaches the minimum value, if so, switching to the motor PWM duty ratio mode to wait for the next judgment, and saves the current calculated power, saves the duty ratio adjustment direction, and recalculates the controller output power P0, if the minimum value is not reached, at the moment, the PFC duty ratio is reduced by d1, the current calculated power is saved, the duty ratio adjustment direction is saved, and the controller output power P0 is recalculated;
s6, on the basis of S2, when the current MPPT module is judged not to be in the PFC pump voltage mode, whether the output power P0 of the controller is larger than the calculated power P1 of the water pump in the last operation is judged, if yes, whether the last adjustment is the increase of the PWM duty ratio of the motor is judged, and if not, whether the last adjustment is the increase of the PWM duty ratio of the motor is also judged;
s7, on the basis of S6, when judging that the output power P0 of the controller is a condition which is larger than the calculated power P1 of the water pump in the last operation and judging that the last adjustment is not the condition that the PWM duty ratio of the motor is increased, the PWM duty ratio is reduced by d2 at the moment, the current calculated power is saved, the duty ratio adjustment direction is saved, and the output power P0 of the controller is recalculated, if judging that the last adjustment is the condition that the PWM duty ratio of the motor is increased, whether the PWM duty ratio of the motor reaches the maximum value is judged at the moment, if so, the PFC pump voltage mode is switched to, the next judgment is waited, the current calculated power is saved, the duty ratio adjustment direction is saved, the output power P0 of the controller is recalculated, and if not, the PWM duty ratio is increased by; saving the current calculated power, saving the duty ratio adjustment direction, and recalculating the controller output power P0;
s8, on the basis of S6, when the controller output power P0 is judged not to be larger than the calculated power P1 of the water pump in the last operation and the last adjustment is judged to be the condition that the PWM duty ratio of the motor is increased, the PWM duty cycle is decreased by d2 and the current calculated power is saved, the duty cycle adjustment direction is saved, and recalculates the controller output power P0, if the last adjustment is not the condition of increasing the PWM duty ratio of the motor, then judging whether the PWM duty ratio of the motor reaches the maximum value, if so, switching to a PFC pump voltage mode to wait for the next judgment, and saves the current calculated power, saves the duty ratio adjustment direction, and recalculates the controller output power P0, if the maximum value is not reached, then the PWM duty cycle is increased by d2 at this point and the current calculated power is saved, the duty cycle adjustment direction is saved, and the controller output power P0 is recalculated.
The invention has the beneficial effects that: the invention particularly provides a maximum power tracking technology based on a variable frequency motor. The technology can cancel the intermediate power conversion part, and under the condition that the power levels of the solar panel and the water pump are reasonably matched, the energy utilization rate is more than 99%, the performance of the solar panel is fully utilized, in addition, the maximum value of the output power of the solar panel can be monitored in real time, the rotating speed of the motor can be adjusted to match the maximum energy output by solar energy, the water pump motor can always work on the power point of the maximum solar energy output, and the optimization of the efficiency is achieved.
The solar cell panel has high utilization rate, the average energy can reach more than 98 percent, and the output capacity of the solar cell panel can be automatically tracked within the motor capacity range by more than 98 percent;
the control fluctuation is small, the support voltage range is wide, and the normal operation can be supported between DC50V and 500V;
the maximum power is controlled and tracked through the input power of the motor, and the logic is simple.
Drawings
FIG. 1 is a flowchart illustrating a command for determining whether the MPPT mode is the PFC pump voltage mode according to the present invention;
FIG. 2 is a flowchart illustrating a method for determining whether the MPPT mode is the PFC pump voltage mode;
fig. 3 is a schematic diagram of the electrical connection of the solar panel, the controller and the water pump motor according to the present invention.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easily understood, the invention is further described with reference to the specific embodiments and the drawings.
Examples
The control method comprises the following specific steps:
1. the water pump system is connected into the solar cell panel, and the step 2 is executed;
2. the water pump controller detects whether the solar panel is input, if so, the step 4 is executed, otherwise, the step 3 is executed;
3. operating at a fixed rotation speed;
4. initializing an MPPT module and executing the step 5;
5. calculating the output power P0 of the controller, and executing the step 6;
6. judging whether the current MPPT module is in a PFC pump voltage mode, if so, executing a step 7, otherwise, executing a step 11;
7. judging whether the output power P0 of the controller is larger than the calculated power P1 of the water pump during the last operation, if so, executing the step 8, otherwise, executing the step 15;
8. judging whether the last adjustment direction is the PFC duty ratio increasing direction or not, if so, executing a step 9, otherwise, executing a step 16;
step 10 is performed by increasing the PFC duty cycle d 1;
10. saving P0 to P1, saving the duty ratio adjustment direction, and executing a step 5 loop;
11. judging whether the output power P0 of the controller is larger than the calculated power P1 of the water pump during the last operation, if so, executing the step 12, otherwise, executing the step 19;
12. judging whether the last adjustment direction is the PWM duty ratio increasing direction or not, if so, executing the step 13, otherwise, executing the step 23;
13. judging whether the PWM duty ratio of the motor reaches the maximum value, if so, executing a step 14, otherwise, executing a step 20;
14. switching to a PFC pump voltage mode, and executing the step 10;
15. judging whether the last adjustment direction is the PFC duty ratio increasing direction or not, if so, executing a step 16, otherwise, executing a step 18;
16. judging whether the PFC duty ratio reaches the minimum value, if so, executing a step 17, otherwise, executing a step 24;
17. switching the MPPT mode into a motor PWM duty ratio mode, and executing the step 10;
increasing the PFC duty cycle by d1, and executing the step 10;
19. judging whether the last adjustment direction is the PWM duty ratio increasing direction or not, if so, executing a step 23, otherwise, executing a step 21;
increasing the PWM duty ratio by d2, and executing the step 10;
21. judging whether the PWM duty ratio reaches the maximum value, if so, executing a step 22, otherwise, executing a step 20;
22. switching the MPPT mode into a PFC pump voltage mode, and executing the step 10;
reducing the PWM duty ratio by d2, and executing the step 10;
step 10 is performed with the PFC duty cycle reduced by d 1.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A control method for realizing the maximum power tracking of a water pump applied to a solar power supply comprises a solar panel, the water pump and a control module for controlling the operation of a motor on the water pump, wherein the control module is respectively electrically connected with the solar panel and the water pump,
the control module is an MPPT module, and the specific control mode is as follows:
s1, firstly, the water pump controller judges whether the solar energy direct current input is available, if not, the water pump controller operates according to a fixed rotating speed, if so, the MPPT module is initialized, and the output power P0 of the controller is calculated;
s2, judging whether the MPPT module is in a PFC pump voltage mode, if so, judging whether the output power P0 of the controller is larger than the calculated power P1 of the water pump in the last operation, and if not, judging whether the output power P0 of the controller is larger than the calculated power P1 of the water pump in the last operation;
s3, on the basis of S2, when the current MPPT module is judged to be in the PFC pump voltage mode, whether the output power P0 of the controller is larger than the calculated power P1 of the water pump in the last operation is judged, if yes, whether the last adjustment is the increase of the PFC duty ratio is judged, and if not, whether the last adjustment is the increase of the PFC duty ratio is also judged;
s4, on the basis of S3, when the controller output power P0 is judged to be the condition which is larger than the calculated power P1 of the water pump at the last operation time, and the last adjustment is judged to be the condition that the PFC duty ratio is increased, the PFC duty cycle is increased by d1 and the current calculated power is saved, the duty cycle adjustment direction is saved, and recalculates the controller output power P0, if the previous adjustment was not for an increased PFC duty cycle condition, then, whether the PFC duty ratio reaches the minimum value or not needs to be judged, if the PFC duty ratio reaches the minimum value, the mode is switched to the PWM duty ratio mode of the motor to wait for the next judgment, and saves the current calculated power, saves the duty ratio adjustment direction, and recalculates the controller output power P0, if the minimum value is not reached, at the moment, the PFC duty ratio is reduced by d1, the current calculated power is saved, the duty ratio adjustment direction is saved, and the controller output power P0 is recalculated;
s5, on the basis of S3, when the controller output power P0 is judged not to be larger than the calculated power P1 of the water pump at the last operation time, and the last adjustment is judged not to be the condition of PFC duty ratio increase, the PFC duty cycle is increased by d1 and the current calculated power is saved, the duty cycle adjustment direction is saved, and recalculates the controller output power P0, if the last adjustment is determined to be under the condition of increasing PFC duty ratio, then judging whether the PFC duty ratio reaches the minimum value, if so, switching to the motor PWM duty ratio mode to wait for the next judgment, and saves the current calculated power, saves the duty ratio adjustment direction, and recalculates the controller output power P0, if the minimum value is not reached, at the moment, the PFC duty ratio is reduced by d1, the current calculated power is saved, the duty ratio adjustment direction is saved, and the controller output power P0 is recalculated;
s6, on the basis of S2, when the current MPPT module is judged not to be in the PFC pump voltage mode, whether the output power P0 of the controller is larger than the calculated power P1 of the water pump in the last operation is judged, if yes, whether the last adjustment is the increase of the PWM duty ratio of the motor is judged, and if not, whether the last adjustment is the increase of the PWM duty ratio of the motor is also judged;
s7, on the basis of S6, when judging that the output power P0 of the controller is a condition which is larger than the calculated power P1 of the water pump in the last operation and judging that the last adjustment is not the condition that the PWM duty ratio of the motor is increased, the PWM duty ratio is reduced by d2 at the moment, the current calculated power is saved, the duty ratio adjustment direction is saved, and the output power P0 of the controller is recalculated, if judging that the last adjustment is the condition that the PWM duty ratio of the motor is increased, whether the PWM duty ratio of the motor reaches the maximum value is judged at the moment, if so, the PFC pump voltage mode is switched to, the next judgment is waited, the current calculated power is saved, the duty ratio adjustment direction is saved, the output power P0 of the controller is recalculated, and if not, the PWM duty ratio is increased by; saving the current calculated power, saving the duty ratio adjustment direction, and recalculating the controller output power P0;
s8, on the basis of S6, when the controller output power P0 is judged not to be larger than the calculated power P1 of the water pump in the last operation and the last adjustment is judged to be the condition that the PWM duty ratio of the motor is increased, the PWM duty cycle is decreased by d2 and the current calculated power is saved, the duty cycle adjustment direction is saved, and recalculates the controller output power P0, if the last adjustment is not the condition of increasing the PWM duty ratio of the motor, then judging whether the PWM duty ratio of the motor reaches the maximum value, if so, switching to a PFC pump voltage mode to wait for the next judgment, and saves the current calculated power, saves the duty ratio adjustment direction, and recalculates the controller output power P0, if the maximum value is not reached, then the PWM duty cycle is increased by d2 at this point and the current calculated power is saved, the duty cycle adjustment direction is saved, and the controller output power P0 is recalculated.
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| US6590793B1 (en) * | 1996-08-23 | 2003-07-08 | Canon Kabushiki Kaisha | Electric power supplying apparatus using unstable electric power supply and control method therefor |
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| CN103529900A (en) * | 2013-11-04 | 2014-01-22 | 苏州大学 | MPPT calculation strategy and control method and photovoltaic array power generation system |
| CN106055017A (en) * | 2016-06-12 | 2016-10-26 | 陈圳 | Maximum power point tracing based solar power optimizing method and device |
| CN109245516A (en) * | 2018-09-20 | 2019-01-18 | 北京精密机电控制设备研究所 | A kind of active PFC numerical control device |
| CN109343650A (en) * | 2018-12-18 | 2019-02-15 | 深圳市英威腾光伏科技有限公司 | A kind of maximum power point tracking method, solar controller and relevant device |
-
2019
- 2019-07-02 CN CN201910589099.6A patent/CN110318967B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6590793B1 (en) * | 1996-08-23 | 2003-07-08 | Canon Kabushiki Kaisha | Electric power supplying apparatus using unstable electric power supply and control method therefor |
| CN103475258A (en) * | 2013-09-09 | 2013-12-25 | 河海大学常州校区 | High-voltage pulse power supply with adjustable discharge parameters |
| CN103529900A (en) * | 2013-11-04 | 2014-01-22 | 苏州大学 | MPPT calculation strategy and control method and photovoltaic array power generation system |
| CN106055017A (en) * | 2016-06-12 | 2016-10-26 | 陈圳 | Maximum power point tracing based solar power optimizing method and device |
| CN109245516A (en) * | 2018-09-20 | 2019-01-18 | 北京精密机电控制设备研究所 | A kind of active PFC numerical control device |
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