CN204290805U - A kind of photovoltaic frequency converter and photovoltaic water-raising system - Google Patents
A kind of photovoltaic frequency converter and photovoltaic water-raising system Download PDFInfo
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- CN204290805U CN204290805U CN201420495939.5U CN201420495939U CN204290805U CN 204290805 U CN204290805 U CN 204290805U CN 201420495939 U CN201420495939 U CN 201420495939U CN 204290805 U CN204290805 U CN 204290805U
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
Abstract
The utility model is applicable to photovoltaic art, and provide a kind of photovoltaic frequency converter and photovoltaic water-raising system, this frequency converter comprises: ac/dc switch unit, and its direct-flow input end is connected with photovoltaic cell, and its ac input end is electrically connected with city; Rectification unit, its input is connected with the ac output end of ac/dc switch unit; MPPT control unit, its input is connected with photovoltaic cell; Variable frequency regulating speed control unit, its input is connected with the output of rectification unit and the DC output end of ac/dc switch unit simultaneously, and its control end is connected with the output of MPPT control unit, and its output is connected with motor.The utility model can switch to mains-supplied when insufficient light, thus the demand of pumping up water realized between round-the-clock, and realize maximum power tracing by the power output gathering photovoltaic cell, the service efficiency of photovoltaic cell can be made to arrive more than 98% and considerably increase energy utilization rate.
Description
Technical field
The utility model belongs to photovoltaic art, particularly relates to a kind of photovoltaic frequency converter and photovoltaic water-raising system.
Background technology
Along with the raising of photovoltaic battery panel transformation efficiency and the reduction of price, photovoltaic water-raising system application is more and more extensive, good at some sunshine conditions especially, the place that city's electrotonus or civil power not easily arrive.Traditional photovoltaic water-raising controller adopts fixed voltage to export mostly, the maximum power can not following the tracks of photovoltaic battery panel causes the waste of resource, and, frequency converter in current photovoltaic water-raising system can not make input power switch between alternating current (civil power) and direct current (photovoltaic array), light long-time insufficient time, be difficult to ensure water pump round-the-clock continuous operation.
Utility model content
The object of the utility model embodiment is to provide a kind of photovoltaic frequency converter, is intended to the problem that the frequency converter solved in current photovoltaic water-raising system can not make input power switch between alternating current and direct current.
The utility model embodiment is achieved in that a kind of photovoltaic frequency converter, and described frequency converter is connected between photovoltaic cell and motor, it is characterized in that, described frequency converter is also electrically connected with city, and described frequency converter comprises:
Testing environment light, and be switched to DC power supply when ambient light is sufficient, the ac/dc switch unit of ac power supply is switched to when ambient light is not enough, the direct-flow input end of described ac/dc switch unit is connected with described photovoltaic cell, and the ac input end of described ac/dc switch unit is electrically connected with described city;
Carry out rectification to AC supply voltage, the rectification unit of output dc voltage, the input of described rectification unit is connected with the ac output end of described ac/dc switch unit;
Gather the MPPT control unit of the power output of photovoltaic cell, export frequency change control signal according to described power output, and by frequency change control signal determination peak power output described in disturbance, the input of described MPPT control unit is connected with described photovoltaic cell;
The variable frequency regulating speed control unit of the output frequency change of described motor is controlled according to described frequency change control signal, the input of described variable frequency regulating speed control unit is connected with the output of described rectification unit and the DC output end of described ac/dc switch unit simultaneously, the control end of described variable frequency regulating speed control unit is connected with the output of described MPPT control unit, and the output of described variable frequency regulating speed control unit is connected with described motor.
Further, described frequency converter also comprises:
Judge whether to be according to the output current of described motor and beat dry state; and under beating dry state, control described motor failure beat dry protected location; the described input beating dry protected location is connected with the current output terminal of described motor, and the described output beating dry protected location is connected with the control end of described motor.
Further, described frequency converter also comprises:
Gather the output voltage of photovoltaic cell, when the output voltage of photovoltaic cell is lower than preset value, control the dormancy control unit that described photovoltaic cell enters resting state, the input of described dormancy control unit is connected with the output of described photovoltaic cell, and the output of described dormancy control unit is connected with the dormancy control end of described photovoltaic cell.
Further, described ac/dc switch unit comprises:
The environmentally illuminant module of the corresponding signal of telecommunication of photogenerated;
Compared with threshold signal by the described signal of telecommunication, the electric current comparing unit of output switch control signal, the input of described electric current comparing unit is connected with the output of described illuminant module;
The switch control unit to the switching between DC power supply and AC power is realized according to described switch controlling signal, the control end of described switch control unit is connected with the output of described electric current comparing unit, the direct-flow input end of described switch control unit is the direct-flow input end of described ac/dc switch unit, the ac input end of described switch control unit is the ac input end of described ac/dc switch unit, the DC output end of described switch control unit is the DC output end of described ac/dc switch unit, the ac output end of described switch control unit is the ac output end of described ac/dc switch unit.
Further, described switch control unit comprises:
First fuse (FU1), the second fuse (FU2), the 3rd fuse (FU3), the 4th fuse (FU4), the first diode (D1), the second diode (D2), the first relay (KM1), the second relay (KM2), heat protective device (FR), the 3rd switch (SB1), the 4th switch (S4) and the 5th switch (S5);
Described 3rd fuse (FU3), one end of described 4th fuse (FU4) is just being respectively two direct-flow input ends of described switch control unit and described photovoltaic cell, negative output terminal connects, described 3rd fuse (FU3), the other end of described 4th fuse (FU4) is connected with the side conducting both-end of the two-way controlled switch of described second relay (KM2) respectively, the opposite side conducting both-end of the two-way controlled switch of described second relay (KM2) respectively with described first diode (D1), the anode of described second diode (D2) connects, described first diode (D1), the negative electrode of described second diode (D2) is respectively two DC output ends of described switch control unit, described first fuse (FU1), one end of described second fuse (FU2) is respectively two ac input ends of described switch control unit and is connected with the zero line of described civil power and live wire, described first fuse (FU1), the other end of described second fuse (FU2) is connected with the side conducting both-end of the two-way controlled switch of described first relay (KM1) respectively, the opposite side conducting both-end of the two-way controlled switch of described first relay (KM1) is respectively two ac output ends of described switch control unit, one ac input end of the described switch control unit be connected with described civil power live wire is also connected with one end of described heat protective device (FR), the other end of described heat protective device (FR) is connected with a conduction terminal of described 3rd switch (SB1), another conduction terminal of described 3rd switch (SB1) is connected with a conduction terminal of described 4th switch (S4), another conduction terminal of described 4th switch (S4) is connected with coil one conduction terminal of described first relay (KM1), the control end of described 4th switch (S4) is the first control end of described switch control unit, another conduction terminal of coil of described first relay (KM1) is that another ac input end of described switch control unit is connected with described civil power zero line, one conduction terminal of described 5th switch (S5) is that a direct-flow input end of described switch control unit is connected with the negative pole of described photovoltaic cell, another conduction terminal of described 5th switch (S5) is connected with coil one conduction terminal of described second relay (KM2), another conduction terminal of coil of described second relay (KM2) is that another direct-flow input end of described switch control unit is connected with the positive pole of described photovoltaic cell, the control end of described 5th switch (S5) is the second control end of described switch control unit.
Further, described frequency converter also comprises:
First two-terminal switch (QS1) and the second two-terminal switch (QS2);
Described first two-terminal switch (QS1) is serially connected with between described photovoltaic cell and described MPPT control unit, the two conduction terminal in side of described first two-terminal switch (QS1) is connected with the positive and negative output of described photovoltaic cell respectively, and the two conduction terminal of opposite side of described first two-terminal switch (QS1) is connected with the double input end of described MPPT control unit respectively;
Described second two-terminal switch (QS2) is serially connected with between described civil power and described ac/dc switch unit, the two conduction terminal in the side of described second two-terminal switch (QS2) is connected with the live wire of described civil power, zero line respectively, and the opposite side pair conduction terminal of described second two-terminal switch (QS2) is connected with two ac input ends of described ac/dc switch unit respectively.
Further, described MPPT control unit comprises:
The output current of photovoltaic cell described in Real-time Collection and the sampling module of output voltage, the input of described sampling module is the input of described MPPT control unit;
Determine the computing module of the power output of described photovoltaic cell according to described output current and described output voltage, first, second input of described computing module is connected with the current output terminal of described sampling module and voltage output end respectively;
With default step-length, disturbance is carried out to described frequency change control signal, judge the power output change of described photovoltaic cell, and then determine the processing module of the frequency change control signal that the maximum output frequency of described photovoltaic cell is corresponding, the input of described processing module is connected with the output of described arithmetic element, and the output of described processing module is the output of described MPPT control unit.
Further, describedly beat dry protected location and comprise:
That under different output frequency, detects the output current of described motor beats dry detection module, and the described input beating dry detection module is the described import and export end beating dry protected location;
When described output current is lower than preset value, export beat do judge signal beat dry judge module, the described input beating dry judge module is connected with the described output beating dry detection module;
According to described beat dry judge motor failure described in signal controlling beat dry control module; the described input beating dry control module is connected with the described output beating dry judge module, and the described output beating dry control module is the described output beating dry protected location.
Further, described dormancy control unit comprises:
Gather the dormancy acquisition module of the output voltage of described photovoltaic cell, the input of described dormancy acquisition module is the input of described dormancy control unit;
Generate the dormancy judge module of sleep signal when the output voltage of described photovoltaic cell is less than preset value value, the input of described dormancy judge module is connected with the output of described dormancy acquisition module;
The dormancy control module that described photovoltaic cell enters resting state is controlled according to described sleep signal, the input of described dormancy control module is connected with the output of described dormancy acquisition module, and the output of described dormancy control module is the output of described dormancy control unit.
Another object of the utility model embodiment is to provide a kind of photovoltaic water-raising system adopting above-mentioned photovoltaic frequency converter.
The utility model embodiment can switch to mains-supplied by ac/dc switch unit when insufficient light, thus the demand of pumping up water realized between round-the-clock, ensure the stable operation of water-raising system under intensity of sunshine sudden change, and realize maximum power tracing by the power output gathering photovoltaic cell, the service efficiency of photovoltaic cell can be made to arrive more than 98%, considerably increase energy utilization rate.
Accompanying drawing explanation
The structure chart of the photovoltaic frequency converter that Fig. 1 provides for the utility model embodiment;
The structure chart of the photovoltaic frequency converter that Fig. 2 provides for the utility model one preferred embodiment;
The structure chart of ac/dc switch unit and MPPT control unit in the photovoltaic frequency converter that Fig. 3 provides for the utility model embodiment;
The exemplary circuit figure of the photovoltaic frequency converter breaker in middle control unit that Fig. 4 provides for the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Frequency converter is switched to mains-supplied when insufficient light by the utility model embodiment, thus the demand of pumping up water realized between round-the-clock, ensure the stable operation of water-raising system under intensity of sunshine sudden change, and realize maximum power tracing by the power output gathering photovoltaic cell, improve the service efficiency of photovoltaic cell.
Below in conjunction with specific embodiment, realization of the present utility model is described in detail:
Fig. 1 shows the structure of the photovoltaic frequency converter that the utility model embodiment provides, and for convenience of explanation, illustrate only the part relevant to the utility model.
As the utility model one embodiment, this photovoltaic frequency converter 1 can be applied in any photovoltaic water-raising system.
This photovoltaic frequency converter 1 is connected between photovoltaic cell 2 and motor 4, and photovoltaic frequency converter 1 is also connected with civil power 3, comprising:
Ac/dc switch unit 11, for testing environment light, and be switched to DC power supply (photovoltaic cell) power supply when ambient light is sufficient, AC power (civil power) power supply is switched to when ambient light is not enough, the direct-flow input end of ac/dc switch unit 11 is connected with photovoltaic cell 2, and the ac input end of ac/dc switch unit 11 is connected with civil power 3;
Rectification unit 12, for carrying out rectification to AC supply voltage, output dc voltage, the input of rectification unit 12 is connected with the ac output end of ac/dc switch unit 11;
MPPT (Maximum Power Point Tracking, MPPT maximum power point tracking) control unit 13, for gathering the power output of photovoltaic cell, frequency change control signal is exported according to power output, and by disturbance frequency change control signal determination peak power output, the input of MPPT control unit 13 is connected with photovoltaic cell 2;
Variable frequency regulating speed control unit 14, for controlling the output frequency change of motor according to frequency change control signal, the input of variable frequency regulating speed control unit 14 is connected with the output of rectification unit 12 and the DC output end of ac/dc switch unit 11 simultaneously, the control end of variable frequency regulating speed control unit 14 is connected with the output of MPPT control unit 13, and the output of variable frequency regulating speed control unit 14 is connected with motor 4.
In the utility model embodiment, photovoltaic frequency converter 1 is connected with photovoltaic cell 2 and civil power 3 simultaneously, is powered by photovoltaic cell 2 when sunshine is sufficient, is switched to civil power 3 powers when sunshine is not enough, to ensure that water pump 5 runs not by solar radiation.
When being switched to civil power 3 and powering, the AC conversion of civil power is that direct current is exported to variable frequency regulating speed control unit 14 and powered by rectification unit 12.
For AC asynchronous motor 4, when load is larger, its required electric energy consumed is more, cube being directly proportional of the power of electric energy and the output frequency of motor.Therefore the Maximum Power Output point of photovoltaic cell 2 can be determined by the output frequency of adjustment motor 4.
When being switched to photovoltaic cell 2 (photovoltaic array) and powering, MPPT control unit 13 pairs of photovoltaic cells 2 electric current and voltage sample under different sunshine and temperature determine its power output, due to the power proportion relation that output frequency and the photovoltaic cell 2 of motor 4 provide, therefore can to the output frequency of motor 4 with the continuous disturbance of certain step-length, and judge the change of photovoltaic cell 2 power output, thus determine the Maximum Power Output point of photovoltaic cell 2, complete and the MPPT of photovoltaic array is controlled.
In the utility model embodiment, the output frequency of motor 4 can be changed by frequency change control signal.
The frequency change control signal that variable frequency regulating speed control unit 14 exports according to MPPT control unit 13 carries out frequency adjustment, and then completes the speed regulating control to AC induction motor 4.
The utility model embodiment can switch to mains-supplied by ac/dc switch unit when insufficient light, thus the demand of pumping up water realized between round-the-clock, ensure the stable operation of water-raising system under intensity of sunshine sudden change, and realize maximum power tracing by the power output gathering photovoltaic cell, the service efficiency of photovoltaic cell can be made to arrive more than 98%, considerably increase energy utilization rate.
Fig. 2 shows the structure of the photovoltaic frequency converter that the utility model one preferred embodiment provides, and for convenience of explanation, illustrate only the part relevant to the utility model.
As the utility model one embodiment, this photovoltaic frequency converter 1 also comprises:
Beat dry protected location 15; dry state is beaten for judging whether according to the output current of motor 4 to be in; and under beating dry state, control motor 4 shut down; the input beating dry protected location 15 is connected with the current output terminal of motor 4, and the output beating dry protected location 15 is connected with the control end of motor 4.
As the utility model one preferred embodiment, this dozen of dry protected locations 15 comprise:
Beat dry detection module 151, for detecting the output current of motor 4 under different output frequency, the input beating dry detection module 151 is the import and export end beating dry protected location 15;
In the utility model embodiment, this dozen of dry detection modules 151 can adopt current sampling circuit to realize.
Beat dry judge module 152, for when output current is lower than preset value, output is beaten to do and is judged signal, and the input beating dry judge module 152 is connected with the output beating dry detection module 151;
In the utility model embodiment, this dozen of dry judge modules 152 can adopt comparison circuit to realize.
Beat dry control module 153, for judging that signal controlling motor 4 is shut down according to beating to do, the input beating dry control module 153 is connected with the output beating dry judge module 152, and the output beating dry control module 153 is the output beating dry protected location 15.
In the utility model embodiment; beat the output current that dry protected location 15 detects water pump; control motor 4 to shut down when electric current is too small, realize beating dry defencive function, the circuit module wherein beating the current sense function that dry detection module 151 can have with frequency converter inside shares.
Dormancy control unit 16, for gathering the output voltage of photovoltaic cell 2, when the output voltage of photovoltaic cell 2 is lower than preset value, control photovoltaic cell 2 and enter resting state, the input of dormancy control unit 16 is connected with the output of photovoltaic cell 2, and the output of dormancy control unit 16 is connected with the dormancy control end of photovoltaic cell 2.
As the utility model one preferred embodiment, this dormancy control unit 16 comprises:
Dormancy acquisition module 161, for gathering the output voltage of photovoltaic cell, the input of dormancy acquisition module 161 is the input of dormancy control unit 16;
In the utility model embodiment, this dormancy acquisition module 161 can adopt voltage sampling circuit to realize.
Dormancy judge module 162, for generating sleep signal when the output voltage of photovoltaic cell is less than preset value value, the input of dormancy judge module 162 is connected with the output of dormancy acquisition module;
In the utility model embodiment, this dormancy judge module 162 can adopt comparison circuit to realize.
Dormancy control module 163, enter resting state for controlling photovoltaic cell according to sleep signal, the input of dormancy control module 163 is connected with the output of dormancy acquisition module, and the output of dormancy control module 163 is the output of dormancy control unit 16.
In the utility model embodiment; dormancy control unit 16 judges whether to need dormancy by the output voltage of photovoltaic cell when motor 4 is idle; power output can be determined by the output current of the output voltage of photovoltaic cell and motor 4 when motor 4 works; and compare according to power output and predetermined power value and judge whether to need dormancy; after output voltage is less than predeterminated voltage a period of time; enter Sleep protection state; or after power output is less than predetermined power a period of time, also enter Sleep protection state.
Further, dormancy control unit 16 can share to beat and play the detection that dry detection module 151 carries out motor 4 output current in dry protected location 15.
In the utility model embodiment, judge whether water pump is in by the output current of real-time sampling motor 4 and beat dry state, enter after beating dry state and control water pump a period of time out of service (entering dormancy), again run after Preset Time (dormancy time).
What the utility model embodiment judged water pump by the output current of motor beats dry state, decreases technical failure point, reduce production cost compared to the scheme detection of existing employing level sensor; Judge to beat dry state compared to existing use water pump no-load current, avoid the judgement caused because different water pump no-load current is different inaccurate.And the utility model embodiment also when the power output of beating dry state or photovoltaic cell can not meet the minimum output frequency of setting, carries out dormancy control, and in the time backed off after random resting state that dormancy sets, again carry out playing dry judgement.
Fig. 3 shows the structure of ac/dc switch unit and MPPT control unit in the photovoltaic frequency converter that the utility model embodiment provides, and for convenience of explanation, illustrate only the part relevant to the utility model.
As the utility model one embodiment, this ac/dc switch unit 11 comprises:
Illuminant module 111, for the environmentally corresponding signal of telecommunication of photogenerated;
In the utility model embodiment, light-sensitive device or photo-sensing device induced environment light can be adopted.
Electric current comparing unit 112, for the signal of telecommunication is compared with threshold signal, output switch control signal, the input of electric current comparing unit 112 is connected with the output of illuminant module 111;
In the utility model embodiment, comparison circuit can be adopted to realize comparing of the signal of telecommunication and threshold signal.
Switch control unit 113, for realizing the switching between DC power supply and AC power according to switch controlling signal, the control end of switch control unit 113 is connected with the output of electric current comparing unit 112, the direct-flow input end of switch control unit 113 is the direct-flow input end of ac/dc switch unit 11, the ac input end of switch control unit 113 is the ac input end of ac/dc switch unit 11, the DC output end of switch control unit 113 is the DC output end of ac/dc switch unit 11, the ac output end of switch control unit 113 is the ac output end of ac/dc switch unit 11.
See Fig. 4, switch control unit 113 comprises:
First fuse FU1, the second fuse FU2, the 3rd fuse FU3, the 4th fuse FU4, the first diode D1, the second diode D2, the first relay K M1, the second relay K M2, heat protective device FR, the 3rd switch S B1, the 4th switch S 4 and the 5th switch S 5;
3rd fuse FU3, one end of 4th fuse FU4 is just being respectively two direct-flow input ends of switch control unit 113 and photovoltaic cell, negative output terminal connects, 3rd fuse FU3, the other end of the 4th fuse FU4 is connected with the side conducting both-end of the two-way controlled switch 1132B of the second relay K M2 respectively, the opposite side conducting both-end of the two-way controlled switch 1132B of the second relay K M2 respectively with the first diode D1, the anode of the second diode D2 connects, first diode D1, the negative electrode of the second diode D2 is respectively two DC output ends of switch control unit 113, first fuse FU1, one end of second fuse FU2 is respectively two ac input ends of switch control unit 113 and is connected with the zero line of civil power and live wire, first fuse FU1, the other end of the second fuse FU2 is connected with the side conducting both-end of the two-way controlled switch 1131B of the first relay K M1 respectively, the opposite side conducting both-end of the two-way controlled switch 1131B of the first relay K M1 is respectively two ac output ends of switch control unit 113, one ac input end of the switch control unit 113 be connected with civil power live wire is also connected with one end of heat protective device FR, the other end of heat protective device FR is connected with a conduction terminal of the 3rd switch S B1, another conduction terminal of 3rd switch S B1 is connected with a conduction terminal of the 4th switch S 4, another conduction terminal of 4th switch S 4 is connected with coil 1131A mono-conduction terminal of the first relay K M1, the control end of the 4th switch S 4 is the first control end of switch control unit 113, another conduction terminal of coil 1131A of first relay K M1 is that another ac input end of switch control unit 113 is connected with civil power zero line, one conduction terminal of the 5th switch S 5 is that a direct-flow input end of switch control unit 113 is connected with the negative pole of photovoltaic cell, another conduction terminal of 5th switch S 5 is connected with coil 1132A mono-conduction terminal of the second relay K M2, another conduction terminal of coil 1132A of second relay K M2 is that another direct-flow input end of switch control unit 113 is connected with the positive pole of photovoltaic cell, the control end of the 5th switch S 5 is the second control end of switch control unit 113.
As the utility model one preferred embodiment, this frequency converter 1 can also comprise:
First two-terminal switch QS1 and the second two-terminal switch QS2;
First two-terminal switch QS1 is serially connected with between photovoltaic cell 2 and MPPT control unit 13, the two conduction terminal in side of the first two-terminal switch QS1 is connected with the positive and negative output of photovoltaic cell 2 respectively, and the two conduction terminal of opposite side of the first two-terminal switch QS1 is connected with the double input end of MPPT control unit 13 respectively;
Second two-terminal switch QS2 is serially connected with between civil power 3 and ac/dc switch unit 11, the two conduction terminal in the side of the second two-terminal switch QS2 is connected with the live wire of civil power 3, zero line respectively, and the opposite side pair conduction terminal of the second two-terminal switch QS2 is connected with two ac input ends of ac/dc switch unit 11 respectively.
MPPT control unit 13 comprises:
Sampling module 131, for output current and the output voltage of Real-time Collection photovoltaic cell 2, the input of sampling module 131 is the input of MPPT control unit 13;
In the utility model embodiment, the sampling that sampling module 131 can adopt current-voltage sampling circuit to realize electric current and voltage.
Computing module 132, for the power output according to output current and output voltage determination photovoltaic cell 2, first, second input of computing module 132 is connected with the current output terminal of sampling module 131 and voltage output end respectively;
Processing module 133, for carrying out disturbance to frequency change control signal with default step-length, judge the power output change of photovoltaic cell 2, and then determine the frequency change control signal that the maximum output frequency of photovoltaic cell 2 is corresponding, the input of processing module 133 is connected with the output of arithmetic element 132, and the output of processing module 133 is the output of MPPT control unit 13.
In the utility model embodiment, can single-chip microcomputer integrated computation module 132 and processing module 133 be passed through, and carry out the maximum power tracing (by disturbance frequency change control signal determination peak power output) of photovoltaic cell 2 by following step:
Step 1, by the output frequency (or frequency change control signal) presetting step-length reduction motor 4;
Step 2, judges whether the power output of photovoltaic cell 2 increases;
If so, then return and perform step 2;
If not, then performing step 3, increasing the output frequency (or frequency change control signal) of motor 4 by presetting step-length;
Step 4, judges whether the power output of photovoltaic cell 2 increases;
If so, then return and perform step 4;
If not, then determine that the power output of now photovoltaic cell 2 is maximum power.
What deserves to be explained is, above-mentioned steps belongs to be applied the one of single-chip microcomputer, and those skilled in the art can realize above-mentioned functions by existing application statement or function command collection, and the utility model is only protected the syndeton of above-mentioned module.
In the utility model embodiment, in increase output frequency process, if photovoltaic cell 2 power output increases, then can continue to increase output frequency, if photovoltaic cell 2 power output reduces, then reduce output frequency; In minimizing output frequency process, if the power output of photovoltaic cell 2 increases, then continue to reduce output frequency, otherwise increase output frequency, the corresponding maximum power point of photovoltaic array of output frequency can be obtained.
Another object of the utility model embodiment is to provide a kind of photovoltaic water-raising system adopting above-mentioned photovoltaic frequency converter.
The utility model embodiment can switch to mains-supplied by ac/dc switch unit when insufficient light, thus the demand of pumping up water realized between round-the-clock, ensure the stable operation of water-raising system under intensity of sunshine sudden change, and realize maximum power tracing by the power output gathering photovoltaic cell, the service efficiency of photovoltaic cell can be made to arrive more than 98%, considerably increase energy utilization rate.Simultaneously, what the utility model embodiment can also judge water pump by the output current of motor beats dry state, without the need to level switch, decrease technical failure point, reduce production cost, accuracy is higher, and when beating dry state or photovoltaic cell exports not enough, enter resting state, to reduce energy consumption.
These are only preferred embodiment of the present utility model, not in order to limit the utility model, all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (10)
1. a photovoltaic frequency converter, described frequency converter is connected between photovoltaic cell and motor, it is characterized in that, described frequency converter is also electrically connected with city, and described frequency converter comprises:
Testing environment light, and be switched to DC power supply when ambient light is sufficient, the ac/dc switch unit of ac power supply is switched to when ambient light is not enough, the direct-flow input end of described ac/dc switch unit is connected with described photovoltaic cell, and the ac input end of described ac/dc switch unit is electrically connected with described city;
Carry out rectification to AC supply voltage, the rectification unit of output dc voltage, the input of described rectification unit is connected with the ac output end of described ac/dc switch unit;
Gather the MPPT control unit of the power output of photovoltaic cell, export frequency change control signal according to described power output, and by frequency change control signal determination peak power output described in disturbance, the input of described MPPT control unit is connected with described photovoltaic cell;
The variable frequency regulating speed control unit of the output frequency change of described motor is controlled according to described frequency change control signal, the input of described variable frequency regulating speed control unit is connected with the output of described rectification unit and the DC output end of described ac/dc switch unit simultaneously, the control end of described variable frequency regulating speed control unit is connected with the output of described MPPT control unit, and the output of described variable frequency regulating speed control unit is connected with described motor.
2. photovoltaic frequency converter as claimed in claim 1, it is characterized in that, described frequency converter also comprises:
Judge whether to be according to the output current of described motor and beat dry state; and under beating dry state, control described motor failure beat dry protected location; the described input beating dry protected location is connected with the current output terminal of described motor, and the described output beating dry protected location is connected with the control end of described motor.
3. photovoltaic frequency converter as claimed in claim 1, it is characterized in that, described frequency converter also comprises:
Gather the output voltage of photovoltaic cell, when the output voltage of photovoltaic cell is lower than preset value, control the dormancy control unit that described photovoltaic cell enters resting state, the input of described dormancy control unit is connected with the output of described photovoltaic cell, and the output of described dormancy control unit is connected with the dormancy control end of described photovoltaic cell.
4. photovoltaic frequency converter as claimed in claim 1, it is characterized in that, described ac/dc switch unit comprises:
The environmentally illuminant module of the corresponding signal of telecommunication of photogenerated;
Compared with threshold signal by the described signal of telecommunication, the electric current comparing unit of output switch control signal, the input of described electric current comparing unit is connected with the output of described illuminant module;
The switch control unit to the switching between DC power supply and AC power is realized according to described switch controlling signal, the control end of described switch control unit is connected with the output of described electric current comparing unit, the direct-flow input end of described switch control unit is the direct-flow input end of described ac/dc switch unit, the ac input end of described switch control unit is the ac input end of described ac/dc switch unit, the DC output end of described switch control unit is the DC output end of described ac/dc switch unit, the ac output end of described switch control unit is the ac output end of described ac/dc switch unit.
5. photovoltaic frequency converter as claimed in claim 4, it is characterized in that, described switch control unit comprises:
First fuse (FU1), the second fuse (FU2), the 3rd fuse (FU3), the 4th fuse (FU4), the first diode (D1), the second diode (D2), the first relay (KM1), the second relay (KM2), heat protective device (FR), the 3rd switch (SB1), the 4th switch (S4) and the 5th switch (S5);
Described 3rd fuse (FU3), one end of described 4th fuse (FU4) is just being respectively two direct-flow input ends of described switch control unit and described photovoltaic cell, negative output terminal connects, described 3rd fuse (FU3), the other end of described 4th fuse (FU4) is connected with the side conducting both-end of the two-way controlled switch of described second relay (KM2) respectively, the opposite side conducting both-end of the two-way controlled switch of described second relay (KM2) respectively with described first diode (D1), the anode of described second diode (D2) connects, described first diode (D1), the negative electrode of described second diode (D2) is respectively two DC output ends of described switch control unit, described first fuse (FU1), one end of described second fuse (FU2) is respectively two ac input ends of described switch control unit and is connected with the zero line of described civil power and live wire, described first fuse (FU1), the other end of described second fuse (FU2) is connected with the side conducting both-end of the two-way controlled switch of described first relay (KM1) respectively, the opposite side conducting both-end of the two-way controlled switch of described first relay (KM1) is respectively two ac output ends of described switch control unit, one ac input end of the described switch control unit be connected with described civil power live wire is also connected with one end of described heat protective device (FR), the other end of described heat protective device (FR) is connected with a conduction terminal of described 3rd switch (SB1), another conduction terminal of described 3rd switch (SB1) is connected with a conduction terminal of described 4th switch (S4), another conduction terminal of described 4th switch (S4) is connected with coil one conduction terminal of described first relay (KM1), the control end of described 4th switch (S4) is the first control end of described switch control unit, another conduction terminal of coil of described first relay (KM1) is that another ac input end of described switch control unit is connected with described civil power zero line, one conduction terminal of described 5th switch (S5) is that a direct-flow input end of described switch control unit is connected with the negative pole of described photovoltaic cell, another conduction terminal of described 5th switch (S5) is connected with coil one conduction terminal of described second relay (KM2), another conduction terminal of coil of described second relay (KM2) is that another direct-flow input end of described switch control unit is connected with the positive pole of described photovoltaic cell, the control end of described 5th switch (S5) is the second control end of described switch control unit.
6. photovoltaic frequency converter as claimed in claim 5, it is characterized in that, described frequency converter also comprises:
First two-terminal switch (QS1) and the second two-terminal switch (QS2);
Described first two-terminal switch (QS1) is serially connected with between described photovoltaic cell and described MPPT control unit, the two conduction terminal in side of described first two-terminal switch (QS1) is connected with the positive and negative output of described photovoltaic cell respectively, and the two conduction terminal of opposite side of described first two-terminal switch (QS1) is connected with the double input end of described MPPT control unit respectively;
Described second two-terminal switch (QS2) is serially connected with between described civil power and described ac/dc switch unit, the two conduction terminal in the side of described second two-terminal switch (QS2) is connected with the live wire of described civil power, zero line respectively, and the opposite side pair conduction terminal of described second two-terminal switch (QS2) is connected with two ac input ends of described ac/dc switch unit respectively.
7. photovoltaic frequency converter as claimed in claim 1, it is characterized in that, described MPPT control unit comprises:
The output current of photovoltaic cell described in Real-time Collection and the sampling module of output voltage, the input of described sampling module is the input of described MPPT control unit;
Determine the computing module of the power output of described photovoltaic cell according to described output current and described output voltage, first, second input of described computing module is connected with the current output terminal of described sampling module and voltage output end respectively;
With default step-length, disturbance is carried out to described frequency change control signal, judge the power output change of described photovoltaic cell, and then determine the processing module of the frequency change control signal that the maximum output frequency of described photovoltaic cell is corresponding, the input of described processing module is connected with the output of described arithmetic element, and the output of described processing module is the output of described MPPT control unit.
8. photovoltaic frequency converter as claimed in claim 2, is characterized in that, describedly beats dry protected location and comprises:
That under different output frequency, detects the output current of described motor beats dry detection module, and the described input beating dry detection module is the described import and export end beating dry protected location;
When described output current is lower than preset value, export beat do judge signal beat dry judge module, the described input beating dry judge module is connected with the described output beating dry detection module;
According to described beat dry judge motor failure described in signal controlling beat dry control module; the described input beating dry control module is connected with the described output beating dry judge module, and the described output beating dry control module is the described output beating dry protected location.
9. photovoltaic frequency converter as claimed in claim 3, it is characterized in that, described dormancy control unit comprises:
Gather the dormancy acquisition module of the output voltage of described photovoltaic cell, the input of described dormancy acquisition module is the input of described dormancy control unit;
Generate the dormancy judge module of sleep signal when the output voltage of described photovoltaic cell is less than preset value value, the input of described dormancy judge module is connected with the output of described dormancy acquisition module;
The dormancy control module that described photovoltaic cell enters resting state is controlled according to described sleep signal, the input of described dormancy control module is connected with the output of described dormancy acquisition module, and the output of described dormancy control module is the output of described dormancy control unit.
10. a photovoltaic water-raising system, described photovoltaic water-raising system comprises the photovoltaic frequency converter as described in any one of claim 1 to 8.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105089965A (en) * | 2015-08-31 | 2015-11-25 | 上海俊玥能源科技有限公司 | Alternating-current photovoltaic water pump system and control method thereof |
| CN105450138A (en) * | 2014-08-29 | 2016-03-30 | 苏州伟创电气设备技术有限公司 | Solar photovoltaic frequency converter and photovoltaic pumping system |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105450138A (en) * | 2014-08-29 | 2016-03-30 | 苏州伟创电气设备技术有限公司 | Solar photovoltaic frequency converter and photovoltaic pumping system |
| CN105089965A (en) * | 2015-08-31 | 2015-11-25 | 上海俊玥能源科技有限公司 | Alternating-current photovoltaic water pump system and control method thereof |
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Address after: 215000 No. 1000 Songhua Road, Guo Xiang street, Wuzhong Economic and Technological Development Zone, Suzhou, Jiangsu Patentee after: Suzhou Weichuang Electrical Technology Co., Ltd. Address before: Suzhou Wuzhong District City, Jiangsu province 215100 Guo Lane Street Road No. 111 Building 1 Wusongjiang Patentee before: SUZHOU WEICHUANG ELECTRICAL EQUIPMENT TECHNOLOGY CO., LTD. |