CN207691753U - A kind of photovoltaic water pump system based on maximum current detection - Google Patents
A kind of photovoltaic water pump system based on maximum current detection Download PDFInfo
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- CN207691753U CN207691753U CN201721605013.7U CN201721605013U CN207691753U CN 207691753 U CN207691753 U CN 207691753U CN 201721605013 U CN201721605013 U CN 201721605013U CN 207691753 U CN207691753 U CN 207691753U
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- water pump
- maximum current
- photovoltaic array
- control unit
- photovoltaic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a kind of photovoltaic water pump systems based on maximum current detection, including at least photovoltaic array, maximum current detection module, current-voltage sampling module, control unit, frequency conversion inverter module and water pump, wherein, control unit is connected with maximum current detection module, current-voltage sampling module and frequency conversion inverter module, the working condition for real-time voltage and real-time current the control frequency conversion inverter module that the maximum current and current-voltage sampling module for being detected according to maximum current detection module are detected；Maximum current detection module is attempted by the output end of photovoltaic array, and for the control command according to control unit, the maximum current that photovoltaic array can be output is detected in water pump off working state.Using the technical solution of the utility model, system according to the maximum current of photovoltaic array as the basis for estimation for opening water pump, the stability that influences system to avoid opening water pump in the case of photovoltaic array extremely low output power.
Description
Technical field
The utility model is related to technical field of photovoltaic power generation more particularly to a kind of photovoltaic water pumps based on maximum current detection
System.
Background technology
Currently, solar energy is a kind of energy of cleanliness without any pollution, it can not only alleviate the crisis of chemical energy source increasingly depleted, but also
Worsening ecological environment can be improved.Solar photovoltaic water pump system is an application of solar energy power generating, former
Reason is that solar energy is converted directly into electric energy using solar cell, then utilizes the electrical energy drive water pump that this is converted from water source
Water lift.Photovoltaic water pump system is to solving to have without electric human livestock drinking water, agricultural irrigation and drip irrigation system from far-off regions, urban landscape etc.
Wide application prospect.
Photovoltaic water pump system is usually off-line type unattended system, function be using solar energy from water source water lift.
But the water inlet of system to water outlet there is difference in height, this difference in height is determined by the environment residing for system, sometimes up to
Rice up to a hundred.Water pump is driven to rotate when the output power of photovoltaic array is low, hydraulic pressure is possibly caused by water pump rotation at this time can not
Overcome this difference in height.When system is in this situation, system is not discharged, and water pump is in invalid idling conditions.The nothing of water pump
Effect rotation had not only wasted the energy caused by photovoltaic array, but also increased the meaningless loss of water pump, this is unfavorable for the work of water pump system
Make.The output voltage of photovoltaic array is as the foundation for judging photovoltaic array fan-out capability when the prior art usually samples zero load, so
And output voltage can not react photovoltaic array fan-out capability well, open water pump when sunlight is weaker, photovoltaic array it is defeated
Go out voltage instantaneous to be pulled low, system is caused to be in the start and stop state of repetition, not only influenced the stability of system, but also fragile system is hard
Part.
Therefore for drawbacks described above present in currently available technology, it is really necessary to be studied, to provide a kind of scheme,
Solve defect existing in the prior art.
Utility model content
In view of this, it is necessory to provide a kind of photovoltaic water pump system detected based on maximum current, it is maximum by being arranged
Current detection module detects the maximum current of photovoltaic array, and so as to obtain the fan-out capability of photovoltaic array in advance, reaching has
The purpose of effect control water pump.
In order to solve technical problem of the existing technology, the technical solution of the utility model is as follows：
A kind of photovoltaic water pump system based on maximum current detection includes at least photovoltaic array (1), maximum current detects mould
Block (2), current-voltage sampling module (3), control unit (4), frequency conversion inverter module (5) and water pump (6), wherein
The photovoltaic array (1) is made of solar cell connection in series-parallel, for converting solar energy to electric energy；
Described control unit (4) and the maximum current detection module (2), current-voltage sampling module (3) and frequency conversion are inverse
Become module (5) to be connected, the maximum current for being detected according to the maximum current detection module (2) and electric current electricity
Real-time voltage and real-time current that pressure sampling module (3) is detected control the working condition of the frequency conversion inverter module (5)；
The frequency conversion inverter module (5) is used to be generated photovoltaic array (1) according to the control command of described control unit (4)
Direct current be changed into the alternating current of certain frequency and make the output of the water pump (6) running power and the photovoltaic array (1)
Power is adapted；
The maximum current detection module (2) is attempted by the output end of the photovoltaic array (1), for according to control unit
(4) control command detects the maximum current that the photovoltaic array (1) can be output in the water pump (6) off working state,
Described control unit (4) controls whether the water pump (6) opens according to the maximum current；
The current-voltage sampling module (3) in the water pump (6) working condition for detecting the photovoltaic array (1)
Real-time voltage and real-time current and feed back to described control unit (4), described control unit (4) is according to the photovoltaic array
(1) working condition of the maximum power point control water pump (6) exported makes it be operated near maximum power point.
Preferably, further include full water protective device (7) of cutting off the water supply, the full water protective device (7) of cutting off the water supply is described for detecting
The water shortage situation of water pump (6) and the full water situation of water tank simultaneously feed back to described control unit (4).
Preferably, further include charging module (8) and accumulator group (9), the charging module (8) is for according to control unit
(4) control command is filled with accumulator group (9) by direct current that the photovoltaic array (1) generates is converted.
Preferably, described control unit (4) is made of microcontroller and its control program operated on the microcontroller.
Preferably, the maximum current detection module (2) further comprises switching tube and sampling resistor, the switching tube
Base stage is controlled by described control unit (4), and the collector of the switching tube is connected with the positive output end of the photovoltaic array (1)
It connects, the emitter of the switching tube is connected with one end of the sampling resistor, the other end of the sampling resistor and the light
The negative output terminal of photovoltaic array (1) is connected；Described control unit (4) the control switching tube is in the conduction state or ends shape
When state, the switching tube are in the conduction state, make the output end short circuit of the photovoltaic array (1), described control unit (4) acquisition
The voltage at the sampling resistor both ends obtains maximum current value in turn.
Preferably, the full water protective device (7) of cutting off the water supply includes at least cut off the water supply sensor and full water sensor.
Preferably, further include setting display unit (10), the setting display unit (10) is for being arranged initial conditions
Parameter setting.
Compared with prior art, the technical solution of the utility model has the following technical effects：
1. system according to the maximum current of the photovoltaic array of detection as basis for estimation, when the output power of photovoltaic array can
So as to just open water pump when system is discharged, avoid opening water pump in the case of photovoltaic array extremely low output power and influencing system
Stability；
2. system just opens water pump in the case where sunlight can guarantee water outlet substantially, reduce the invalid idle running of water pump, increases
The service life of make-up water pump；
It is the more efficiently energy using photovoltaic water pump system 3. system, which has been distinguished, can be discharged and cannot be discharged two states
Source provides prerequisite.The comprehensive utilization of energy of water pump system be mainly be embodied in how using photovoltaic array output power without
Method meets this portion of energy when water pump water outlet requirement, and in water air pump inoperative, the output energy of photovoltaic array fills accumulator
Electricity improves the energy utilization rate of system.
4. system uses maximal power tracing in pump working so that system always works in the maximum of power output
Solar energy is effectively utilized in state；
5. system improves the stability of system with cutting off the water supply and full water defencive function.
Description of the drawings
Fig. 1 is the VA characteristic curve of solar cell.
Fig. 2 is the system block diagram for the photovoltaic water pump system that the utility model is detected based on maximum current.
Fig. 3 is the circuit diagram of maximum current detection module.
Fig. 4 is the control flow for carrying out maximum power sampling.
Following specific embodiment will further illustrate the utility model in conjunction with above-mentioned attached drawing.
Specific implementation mode
Technical solution provided by the utility model is described further below with reference to attached drawing.
In the prior art, photovoltaic water pump system is usually off-line type unattended system, however the intensity of sunlight is by day
Gas influence randomness is larger, water pump is opened when sunlight is weaker, the output voltage moment of photovoltaic array is pulled low, causes at system
In the start and stop state repeated.The output voltage of photovoltaic array, which is used as, when the prior art usually samples zero load judges that photovoltaic array exports
The foundation of ability, however, output voltage can not react photovoltaic array fan-out capability well, only after opening water pump,
It could know whether current photovoltaic array fan-out capability meets water pump water outlet condition by MPPT maximum power point tracking, however meeting in this way
Water pump is caused to be in the start and stop state repeated, pump working both wastes energy caused by photovoltaic array in invalid idling conditions
Source, and easily cause the damage of water pump.
In order to solve the above-mentioned technical problem, applicant has extensively studied the characteristic of solar cell, referring to Fig. 1, show
The VA characteristic curve of solar cell, according to the characteristic of solar cell, output voltage is in maximum functional point voltage Vm or less
Region has constant-current source characteristic, has constant pressure source characteristic in Vm area above, the size of output current is related with intensity of illumination, light
The practical power output capacity for reflecting photovoltaic array of the maximum current of photovoltaic array.The height of photovoltaic array output voltage cannot be just
The really size of reflection photovoltaic array output power, because being exported at light load in photovoltaic array, output voltage varies less.
Referring to Fig. 2, it is shown the system block diagram for the photovoltaic water pump system that the utility model is detected based on maximum current, at least
Including photovoltaic array (1), maximum current detection module (2), current-voltage sampling module (3), control unit (4), frequency conversion inversion
Module (5) and water pump (6), wherein
Photovoltaic array (1) is made of solar cell connection in series-parallel, for converting solar energy to electric energy, photovoltaic array
It is generated with the direct current that light intensity and angle of light change and change through sunlight；
Control unit (4) and maximum current detection module (2), current-voltage sampling module (3) and frequency conversion inverter module
(5) it is connected, the maximum current for being detected according to maximum current detection module (2) and current-voltage sampling module (3)
The working condition of real-time voltage and real-time current the control frequency conversion inverter module (5) detected；
The direct current that frequency conversion inverter module (5) is used to be generated photovoltaic array (1) according to the control command of control unit (4)
It is changed into the alternating current of certain frequency and water pump (6) running power and the output power of photovoltaic array (1) is made to be adapted；
Maximum current detection module (2) is attempted by the output end of photovoltaic array (1), for the control according to control unit (4)
System order detects the maximum current that photovoltaic array (1) can be output, control unit (4) basis in water pump (6) off working state
Whether maximum current control water pump (6) is opened；
Current-voltage sampling module (3) in water pump (6) working condition detect photovoltaic array (1) real-time voltage and
Real-time current simultaneously feeds back to control unit (4), and control unit (4) controls water according to the maximum power point that photovoltaic array (1) exports
The working condition of pump (6) makes it be operated near maximum power point.
In a preferred embodiment, further include full water protective device (7) of cutting off the water supply, full water protective device of cutting off the water supply (7) is used
In the water shortage situation of detection water pump (6) and the full water situation of water tank and feed back to control unit (4).It cuts off the water supply full water protective device
(7) it is made of water level sensor, including at least sensor and the full water sensor of cutting off the water supply.Control unit (4) is lacked according to water pump (6)
Regimen condition and the full water situation of water tank control the work of this system.So as to the in due course operation that switches off the pump, it is to protect
System.
In a preferred embodiment, further include charging module (8) and accumulator group (9), charging module (8) is for root
Accumulator group (9) is filled with by direct current that photovoltaic array (1) generates is converted according to the control command of control unit (4).
In a preferred embodiment, control unit (4) by microcontroller and its operates in controlling party on the microcontroller
Method forms.
In a preferred embodiment, further include setting display unit (10), setting display unit (10) is for being arranged
The parameter setting of initial conditions.Allow system to meet the variation of initial conditions caused by different placement environment, has suitable
Answer the function of varying environment.
Using above-mentioned technical proposal, mould is detected since the utility model is provided with maximum current in the output end of photovoltaic array
Block, so as to detect the maximum current of photovoltaic array；And then system is according to the photovoltaic array maximum current detected, judge be
System output power at this time, thus decision systems whether open water pump.To avoid the feelings in the extremely low output power of photovoltaic array
Water pump is opened under condition and influences the stability of system；System just opens water pump in the case where sunlight can guarantee water outlet substantially, subtracts
The invalid idle running for having lacked water pump, increases the service life of water pump.
Referring to Fig. 3, it show the circuit diagram of maximum current detection module (2), maximum current detection module (2) is into one
Step includes switching tube and sampling resistor, and the base stage of switching tube is controlled by control unit (4), the collector and photovoltaic array of switching tube
(1) positive output end is connected, and the emitter of switching tube is connected with one end of sampling resistor, the other end and light of sampling resistor
The negative output terminal of photovoltaic array (1) is connected；Control unit (4) controls that switching tube is in the conduction state or cut-off state, switching tube
When in the conduction state, make the output end short circuit of photovoltaic array (1), control unit (4) acquire the voltage at sampling resistor both ends into
And obtain maximum current value.
The method that the utility model uses instantaneous measurement photovoltaic array output short circuit current, the output of photovoltaic array is electric at this time
Stream is approximately maximum current.Control is control signal in figure, and the gate pole (G) for controlling IGBT pipes T1, T1 is can to pass through
The IGBT of high current is managed, and R3 is sampling resistor.When Control is high level, the collector (C-terminal) and emitter (ends E) of T1
Conducting, the electric current of photovoltaic array flows through from R3, generates voltage difference, and then amplifying circuit is by the voltage amplification of R3, system re-sampling
Amplified signal samples the voltage value by control module and obtains maximum electricity to obtain voltage value corresponding with maximum current
Flow valuve.Due to only photovoltaic array and connect switching tube and make its short circuit, to only need a small amount of element just can realize maximum current
Detection, without changing original system hardware frame；Meanwhile the resistance value of sampling resistor is extremely low, and resistance value can generally be selected to be less than 1
Therefore the power resistor in Europe also hardly consumes energy in maximum current detection process.
Referring to Fig. 4, the control flow for progress maximum power sampling.Wherein, T is grade time second, is such as 5 seconds left sides
It is right.Because the moment of IGBT short circuits by the electric current of R3 and unstable, needs to wait for a period of time, this time rank of t2 is
Microsecond grade is such as 300us or so, and the sampling time of maximum current is very short, within 1ms, so in the time interval of second grade,
The sampling that a 1ms carries out maximum current is interrupted, the normal operation of system is had no effect on.According to flow chart, system is only at two kinds
In the case of carry out maximum current sampling：One is systems to be initially powered up operation, and water pump and charging equipment are closing shape at this time
State；Another kind is that system is in charged state.It, can since system carries out MPPT controls when system is in water pump operation state
To judge the power output capacity of water pump photovoltaic array from the output power of current system.
The explanation of above example is only intended to the method and its core concept that help understands the utility model.It should refer to
Go out, it for those skilled in the art, without departing from the principle of this utility model, can also be to this
Some improvement and modification can also be carried out for utility model, these improvement and modification also fall into the protection domain of the utility model claims
It is interior.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use this practicality new
Type.Various modifications to these embodiments will be apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest range consistent with features of novelty.
Claims (6)
1. a kind of photovoltaic water pump system based on maximum current detection, which is characterized in that include at least photovoltaic array（1）, it is maximum
Current detection module（2）, current-voltage sampling module（3）, control unit（4）, frequency conversion inverter module（5）And water pump（6）,
In,
The photovoltaic array（1）It is made of solar cell connection in series-parallel, for converting solar energy to electric energy；
Described control unit（4）With the maximum current detection module（2）, current-voltage sampling module（3）And frequency conversion inversion mould
Block（5）It is connected, for according to the maximum current detection module（2）The maximum current and the Current Voltage detected is adopted
Egf block（3）The real-time voltage and real-time current detected controls the frequency conversion inverter module（5）Working condition；
The frequency conversion inverter module（5）For according to described control unit（4）Control command by photovoltaic array（1）What is generated is straight
Galvanic electricity is changed into the alternating current of certain frequency and makes the water pump（6）Running power and the photovoltaic array（1）Output power
It is adapted；
The maximum current detection module（2）It is attempted by the photovoltaic array（1）Output end, for according to control unit（4）
Control command, in the water pump（6）The photovoltaic array is detected when off working state（1）The maximum current that can be output, institute
State control unit（4）The water pump is controlled according to the maximum current（6）Whether open；
The current-voltage sampling module（3）For in the water pump（6）The photovoltaic array is detected when working condition（1）Reality
When voltage and real-time current and feed back to described control unit（4）, described control unit（4）According to the photovoltaic array（1）It is defeated
The maximum power point gone out controls the water pump（6）Working condition so that it is operated near maximum power point.
2. the photovoltaic water pump system according to claim 1 based on maximum current detection, which is characterized in that further include cutting off the water supply
Full water protective device（7）, the full water protective device of cutting off the water supply（7）For detecting the water pump（6）Water shortage situation and water tank
Full water situation and feed back to described control unit（4）.
3. the photovoltaic water pump system according to claim 1 based on maximum current detection, which is characterized in that further include charging
Module（8）With accumulator group（9）, the charging module（8）For according to control unit（4）Control command by the photovoltaic battle array
Row（1）The direct current of generation is converted to be filled with accumulator group（9）.
4. the photovoltaic water pump system according to claim 1 based on maximum current detection, which is characterized in that the maximum electricity
Flow detection module（2）Further comprise that switching tube and sampling resistor, the base stage of the switching tube are controlled by described control unit
（4）, the collector of the switching tube and the photovoltaic array（1）Positive output end be connected, the emitter of the switching tube with
One end of the sampling resistor is connected, the other end of the sampling resistor and the photovoltaic array（1）Negative output terminal be connected
It connects；Described control unit（4）Control that the switching tube is in the conduction state or cut-off state, the switching tube are in the conduction state
When, make the photovoltaic array（1）Output end short circuit, described control unit（4）Acquire the voltage at the sampling resistor both ends into
And obtain maximum current value.
5. the photovoltaic water pump system according to claim 2 based on maximum current detection, which is characterized in that described to cut off the water supply completely
Water conservation device（7）Including at least sensor and the full water sensor of cutting off the water supply.
6. the photovoltaic water pump system according to claim 1 based on maximum current detection, which is characterized in that further include setting
Display unit（10）, the setting display unit（10）Parameter setting for initial conditions to be arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721605013.7U CN207691753U (en) | 2017-11-27 | 2017-11-27 | A kind of photovoltaic water pump system based on maximum current detection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721605013.7U CN207691753U (en) | 2017-11-27 | 2017-11-27 | A kind of photovoltaic water pump system based on maximum current detection |
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| CN207691753U true CN207691753U (en) | 2018-08-03 |
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| CN201721605013.7U Expired - Fee Related CN207691753U (en) | 2017-11-27 | 2017-11-27 | A kind of photovoltaic water pump system based on maximum current detection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107846189A (en) * | 2017-11-27 | 2018-03-27 | 浙江省能源与核技术应用研究院 | A kind of photovoltaic water pump system and its control method based on maximum current detection |
| CN109058121A (en) * | 2018-08-30 | 2018-12-21 | 深圳市迈凯诺电气股份有限公司 | A kind of photovoltaic intelligent collection control water pumping system and control method based on MPPT algorithm |
| CN109088472A (en) * | 2018-08-22 | 2018-12-25 | 江苏优为视界科技有限公司 | One kind being based on MPPT photovoltaic semiconductors laser luminescent system |
-
2017
- 2017-11-27 CN CN201721605013.7U patent/CN207691753U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107846189A (en) * | 2017-11-27 | 2018-03-27 | 浙江省能源与核技术应用研究院 | A kind of photovoltaic water pump system and its control method based on maximum current detection |
| CN107846189B (en) * | 2017-11-27 | 2023-11-17 | 浙江省能源与核技术应用研究院 | Photovoltaic water pump system based on maximum current detection and control method thereof |
| CN109088472A (en) * | 2018-08-22 | 2018-12-25 | 江苏优为视界科技有限公司 | One kind being based on MPPT photovoltaic semiconductors laser luminescent system |
| CN109058121A (en) * | 2018-08-30 | 2018-12-21 | 深圳市迈凯诺电气股份有限公司 | A kind of photovoltaic intelligent collection control water pumping system and control method based on MPPT algorithm |
| CN109058121B (en) * | 2018-08-30 | 2023-12-29 | 深圳市迈凯诺电气股份有限公司 | Main machine fault and disconnection control method and utilization rate method of light Fu Zhineng centralized control water lifting system based on MPPT algorithm |
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