CN203775105U - Frequency conversion control device used for photovoltaic water pump system - Google Patents
Frequency conversion control device used for photovoltaic water pump system Download PDFInfo
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- CN203775105U CN203775105U CN201320887271.4U CN201320887271U CN203775105U CN 203775105 U CN203775105 U CN 203775105U CN 201320887271 U CN201320887271 U CN 201320887271U CN 203775105 U CN203775105 U CN 203775105U
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- water pump
- frequency converter
- microprocessor
- rectifier
- inverter
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000006243 chemical reaction Methods 0.000 title abstract 6
- 230000033228 biological regulation Effects 0.000 abstract description 2
- 230000009123 feedback regulation Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The utility model relates to the field of pump control equipment, and particularly relates to a frequency conversion control device used for a photovoltaic water pump system. The frequency conversion control device used for the photovoltaic water pump system comprises photovoltaic array batteries (1), a three-phase motor (2) and a water pump (3). The frequency conversion control device is characterized by further comprising a frequency converter (4), a voltage sensor (51), a water level sensor (52) and a microprocessor (6). The frequency converter (4) is internally provided with a rectifier (41) and an inverter (42). The DC output end of the rectifier (41) is connected with the DC input end of the inverter (42) via a conductive wire. The microprocessor (6) is internally provided with a sinusoidal pulse width modulation circuit, a proportional-integral-derivative control circuit and a memory. The frequency conversion control device is accurate in regulation and control, rapid in reaction, high in energy utilization rate and safe and reliable.
Description
Technical field
The utility model relates to the control appliance field of pump, is specially a kind of frequency-converting control device for photovoltaic water pump system.
Background technology
Solar photovoltaic water pump system is to utilize the solar cell that semiconductor is made that solar energy is directly converted to electric energy, then with electric energy, drives all kinds of motor driving water pumps from the water system of the water source water lifts such as deep-well, river, river, lake, the pool.In the photovoltaic water pump system of some middle low powers, adopt DC brushless motor as the motor that drives water pump more, but in the photovoltaic water pump system of some relatively high powers, be also no lack of the AC asynchronous motor of employing as motor.Use the occasion of AC induction motor conventionally to adopt the special-purpose frequency-variable controller of photovoltaic water pump to control., there are following restrictions: purposes is more single, and product not yet forming manufacture technique can not be guaranteed in wood, safeguards inconvenience while utilizing photovoltaic water pump tailored version frequency-variable controller, etc., these restrictions are all unfavorable for applying of photovoltaic water pump.
Utility model content
In order to overcome the defect of prior art, the water pump control appliance of provide a kind of and regulate and control accurately, be swift in response, energy utilization rate is high, safe and reliable, the utility model discloses a kind of frequency-converting control device for photovoltaic water pump system.
The utility model reaches goal of the invention by following technical solution:
A kind of frequency-converting control device for photovoltaic water pump system, comprise photovoltaic array battery, three phase electric machine and water pump, photovoltaic array battery connects three phase electric machine by wire, the rotating shaft of three phase electric machine connects water pump, it is characterized in that: also comprise frequency converter, voltage sensor, level sensor and microprocessor, in frequency converter, be provided with rectifier and inverter, the DC output end of rectifier connects the direct current input of inverter by wire; In microprocessor, being provided with Using Sinusoidal Pulse Width Modulation (is Sinusoidal Pulse Width Modulation, abbreviation SPWM) circuit, proportional-integral-differential (be proportion-integral-derivative, be called for short PID) control circuit and memory; The voltage output end of photovoltaic array battery connects respectively the alternating current input of frequency converter rectifier by wire, the three-phase alternating current output of frequency converter inverter connects three phase electric machine by wire; Voltage sensor is connected in parallel on and connects between photovoltaic array battery and the wire of frequency converter rectifier, and level sensor is located in the container of accepting water pump water outlet;
The signal output part of voltage sensor and level sensor is all connected microprocessor by holding wire, and the signal output part of microprocessor connects the direct current input of frequency converter inverter by holding wire.
The described frequency-converting control device for photovoltaic water pump system, it is characterized in that: the rectifier of frequency converter is selected bridge rectifier, the inverter of frequency converter is selected insulated gate bipolar transistor (be Insulated Gate Bipolar Transistor, be called for short IGBT).
The described frequency-converting control device for photovoltaic water pump system, is characterized in that: microprocessor is selected single-chip microcomputer.
When the utility model is used, the electric energy that photovoltaic array battery converts the solar energy receiving to non-constant current non-constant voltage exports frequency converter to, the rectifier of frequency converter converts the electric energy receiving to direct current and exports inverter to, at microprocessor Using Sinusoidal Pulse Width Modulation, (be Sinusoidal Pulse Width Modulation, abbreviation SPWM) under the control of circuit, inverter offers three phase electric machine after converting direct current to three-phase alternating current, and three phase electric machine drives water pump to draw water to the container of accepting water from water source.
In microprocessor, store in advance the magnitude of voltage U of stable operating point
0with specified water level value H
0, due to the variation of intensity of sunshine, the output voltage U of photovoltaic array battery
dchave up and down fluctuation, the output voltage U of the photovoltaic array battery arriving when voltage sensor senses
dcbe greater than U
0time, under the control of microprocessor, the frequency of the three-phase alternating current of frequency converter inverter output rises, and it is that load increases that the rotating speed of three phase electric machine also rises, thereby makes the output current I of photovoltaic array battery
dcincrease, through feedback regulation, make like this output voltage U of photovoltaic array battery
dcdecline until be stabilized in stable operating point U
0; Otherwise, the output voltage U of the photovoltaic array battery arriving when voltage sensor senses
dcbe less than U
0time, under the control of microprocessor, the frequency of the three-phase alternating current of frequency converter inverter output declines, and it is that load reduces that the rotating speed of three phase electric machine also declines, thereby makes the output current I of photovoltaic array battery
dcreduce, through feedback regulation, make like this output voltage U of photovoltaic array battery
dcrise until be stabilized in stable operating point U
0.
Level sensor, for detection of whether starting water pump, does not reach rated value H when level sensor detects water level
0time, thereby microprocessor is controlled frequency converter startup three phase electric machine to drive water pump; When detecting water level, level sensor reaches rated value H
0time, thereby microprocessor is controlled frequency converter by three phase electric machine stall water pump is shut down.
The utility model uses feedback control principle, realized under different intensity of sunshines, by changing the output frequency of frequency converter, adjust the rotating speed of three phase electric machine and water pump, i.e. the size of regulating load, thus reach the object of light stable photovoltaic array cell output voltage.
The beneficial effects of the utility model are: regulation and control accurately, are swift in response, and energy utilization rate is high, safe and reliable.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
By specific embodiment, further illustrate the utility model below.
Embodiment 1
For a frequency-converting control device for photovoltaic water pump system, comprise photovoltaic array battery 1, three phase electric machine 2, water pump 3, frequency converter 4, voltage sensor 51, level sensor 52, microprocessor 6, as shown in Figure 1, concrete structure is:
Photovoltaic array battery 1 connects three phase electric machine 2 by wire, and the rotating shaft of three phase electric machine 2 connects water pump 3;
In frequency converter 4, be provided with rectifier 41 and inverter 42, the DC output end of rectifier 41 connects the direct current input of inverter 42 by wire;
In microprocessor 6, being provided with Using Sinusoidal Pulse Width Modulation (is Sinusoidal Pulse Width Modulation, abbreviation SPWM) circuit, proportional-integral-differential (be proportion-integral-derivative, be called for short PID) control circuit and memory;
The voltage output end of photovoltaic array battery 1 connects respectively the alternating current input of frequency converter 4 rectifiers 41 by wire, the three-phase alternating current output of frequency converter 4 inverters 42 connects three phase electric machine 2 by wire;
Voltage sensor 51 is connected in parallel on and connects between photovoltaic array battery 1 and the wire of frequency converter 4 rectifiers 41, and level sensor 52 is located in the container of accepting water pump 3 water outlets;
The signal output part of voltage sensor 51 and level sensor 52 is all connected microprocessor 6 by holding wire, and the signal output part of microprocessor 6 connects the direct current input of frequency converter 4 inverters 42 by holding wire.
In the present embodiment, the rectifier 41 of frequency converter 4 is selected bridge rectifier, and the inverter 42 of frequency converter 4 is selected insulated gate bipolar transistor (be Insulated Gate Bipolar Transistor, be called for short IGBT).
In the present embodiment, microprocessor 6 is selected single-chip microcomputer.
When the present embodiment is used, the electric energy that photovoltaic array battery 1 converts the solar energy receiving to non-constant current non-constant voltage exports frequency converter 4 to, the rectifier 41 of frequency converter 4 converts the electric energy receiving to direct current and exports inverter 42 to, at microprocessor 6 Using Sinusoidal Pulse Width Modulations, (be Sinusoidal Pulse Width Modulation, abbreviation SPWM) under the control of circuit, inverter 42 offers three phase electric machine 2 after converting direct current to three-phase alternating current, and three phase electric machine 2 drives water pump 3 to draw water to the container of accepting water from water source.
The interior magnitude of voltage U that stores in advance stable operating point of microprocessor 6
0with specified water level value H
0, due to the variation of intensity of sunshine, the output voltage U of photovoltaic array battery 1
dchave up and down fluctuation, the output voltage U of the photovoltaic array battery 1 detecting when voltage sensor 51
dcbe greater than U
0time, under the control of microprocessor 6, the frequency of the three-phase alternating current of frequency converter 4 inverter 42 outputs rises, and it is that load increases that the rotating speed of three phase electric machine 2 also rises, thereby makes the output current I of photovoltaic array battery 1
dcincrease, through feedback regulation, make like this output voltage U of photovoltaic array battery 1
dcdecline until be stabilized in stable operating point U
0; Otherwise, the output voltage U of the photovoltaic array battery 1 detecting when voltage sensor 51
dcbe less than U
0time, under the control of microprocessor 6, the frequency of the three-phase alternating current of frequency converter 4 inverter 42 outputs declines, it is that load reduces that the rotating speed of three phase electric machine 2 also declines, thereby the output current Idc of photovoltaic array battery 1 is reduced, through feedback regulation, make like this output voltage U of photovoltaic array battery 1
dcrise until be stabilized in stable operating point U
0.
Level sensor 62, for detection of whether starting water pump, does not reach rated value H when level sensor 62 detects water level
0time, thereby microprocessor 6 is controlled frequency converter 4 startup three phase electric machines 2 to drive water pump 3; When detecting water level, level sensor 62 reaches rated value H
0time, thereby microprocessor 6 is controlled frequency converter 4 by three phase electric machine 2 stall water pumps 3 are shut down.
The output voltage sampling of photovoltaic array battery 1 is the U that utilizes frequency converter 4 inside
dc(being DC bus-bar voltage) sampling functions is realized, and the inside PI that this signal participates in frequency converter 4 regulates to realize designed control mode; This signal is sent to microprocessor 6 and participates in start-stop voltage control simultaneously.A feature of this control mode is, in different time, place, different quiescent potentials is set possibly, therefore need to set different pi regulator set-points.The given amplitude of the set-point operating voltage of PID control circuit generally need by virtue of experience be made comparatively correct estimating (be generally photovoltaic array open circuit voltage 75%) and is aided with actual measurement adjustment, by the control panel of frequency converter 4, sets.Very sensitive to DC voltage bust during system works; therefore system will have good rapidity; otherwise system is (as black clouds blocks suddenly) when intensity of sunshine weakens fast; three phase electric machine 2 reductions of speed not in time; the power that photovoltaic array battery 1 provides is inadequate, and its output voltage can sharply decline and make the system shutdown of breaking down.The rapidity of system can realize by setting the time constant of PID control circuit and the Acceleration and deceleration time of frequency converter 4.
When there being the solar time, delayed is given tacit consent to 60s start-up time, automatically detects input voltage, level sensor 52 sensed water level; If do not reach set point H0, after time delay, start frequency converter 4, water pump 3 starts to draw water, because intensity of illumination changes, so microprocessor 6 is controlled 4 pairs of Udc(DC bus-bar voltage of frequency converter) every 0.01s once sampling, and the lower voltage limit value (130V) arranging is relatively, if be less than lower voltage limit value, frequency converter 4 cut-offs, DC bus-bar voltage U
dcbe down to 0.
The DC bus-bar voltage of frequency converter 4 changes with the variation of intensity of sunshine, for guaranteeing that frequency converter 4 drives three phase electric machine 2 and then drives water pump 3 to have, stablize effective power output, the frequency of frequency converter 4 changes with change in voltage, when the every rising 5V of voltage, frequency ascensional range is 2Hz, when the every decline 5V of voltage, frequency fall is 2Hz, when bucket is full, microprocessor 6 is controlled frequency converter 4 cut-offs, and the present embodiment enters resting state.
Claims (3)
1. the frequency-converting control device for photovoltaic water pump system, comprise photovoltaic array battery (1), three phase electric machine (2) and water pump (3), photovoltaic array battery (1) connects three phase electric machine (2) by wire, the rotating shaft of three phase electric machine (2) connects water pump (3), it is characterized in that: also comprise frequency converter (4), voltage sensor (51), level sensor (52) and microprocessor (6)
In frequency converter (4), be provided with rectifier (41) and inverter (42), the DC output end of rectifier (41) connects the direct current input of inverter (42) by wire;
Microprocessor is provided with Using Sinusoidal Pulse Width Modulation circuit, proportional-integral-differential control circuit and memory in (6);
The voltage output end of photovoltaic array battery (1) connects respectively the alternating current input of frequency converter (4) rectifier (41) by wire, the three-phase alternating current output of frequency converter (4) inverter (42) connects three phase electric machine (2) by wire;
Voltage sensor (51) is connected in parallel on and connects between photovoltaic array battery (1) and the wire of frequency converter (4) rectifier (41), and level sensor (52) is located in the container of accepting water pump (3) water outlet;
The signal output part of voltage sensor (51) and level sensor (52) is all connected microprocessor (6) by holding wire, and the signal output part of microprocessor (6) connects the direct current input of frequency converter (4) inverter (42) by holding wire.
2. the frequency-converting control device for photovoltaic water pump system as claimed in claim 1, it is characterized in that: the rectifier (41) of frequency converter (4) is selected bridge rectifier, the inverter (42) of frequency converter (4) is selected insulated gate bipolar transistor.
3. the frequency-converting control device for photovoltaic water pump system as claimed in claim 1 or 2, is characterized in that: microprocessor (6) is selected single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320887271.4U CN203775105U (en) | 2013-12-31 | 2013-12-31 | Frequency conversion control device used for photovoltaic water pump system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320887271.4U CN203775105U (en) | 2013-12-31 | 2013-12-31 | Frequency conversion control device used for photovoltaic water pump system |
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|---|---|
| CN203775105U true CN203775105U (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320887271.4U Expired - Lifetime CN203775105U (en) | 2013-12-31 | 2013-12-31 | Frequency conversion control device used for photovoltaic water pump system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194689A (en) * | 2016-08-30 | 2016-12-07 | 四川蜀旺新能源股份有限公司 | A kind of photovoltaic control system being automatically adjusted by converter realization water supply |
-
2013
- 2013-12-31 CN CN201320887271.4U patent/CN203775105U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194689A (en) * | 2016-08-30 | 2016-12-07 | 四川蜀旺新能源股份有限公司 | A kind of photovoltaic control system being automatically adjusted by converter realization water supply |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140813 |