CN201910767U - Frequency converter for solar photovoltaic water pump - Google Patents
Frequency converter for solar photovoltaic water pump Download PDFInfo
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- CN201910767U CN201910767U CN2011200008838U CN201120000883U CN201910767U CN 201910767 U CN201910767 U CN 201910767U CN 2011200008838 U CN2011200008838 U CN 2011200008838U CN 201120000883 U CN201120000883 U CN 201120000883U CN 201910767 U CN201910767 U CN 201910767U
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- Prior art keywords
- control module
- water pump
- frequency converter
- solar photovoltaic
- photovoltaic water
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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 relates to a frequency converter for a solar photovoltaic water pump, which comprises a data operation module, an MPPT (maximum power point tracking) control module and a variable-frequency speed regulating control module. A photovoltaic array is subjected to the maximum power output on any sunlight condition and temperature condition under control of the MPPT control module, and speed regulating control to an alternating-current asynchronous motor is completed by the variable-frequency speed regulating control module according to frequency output of the MPPT control module. Further, the variable-frequency speed regulating control module has different proportional coefficient and integral coefficient to increase of sunshine intensity and decrease of sunshine intensity, and performs limit control to error, is capable of completing variable-frequency speed regulating control of the alternating-current asynchronous motor according to difference of output energy of the photovoltaic array on conditions of different sunshine intensity, and meanwhile, system stability on sudden change of sunshine intensity is guaranteed.
Description
Technical field
The utility model relates to a kind of frequency converter, particularly a kind of frequency converter that is used for solar photovoltaic water pump that relates to.
Background technology
Because of areas such as the desert that is subjected to the restriction of technology, economic condition to cause conventional electrical network can't to arrive, island, remote mountain areas, the daily drinking water of resident and livestock, the extraction of irrigation water be difficulty quite.And the appearance of solar photovoltaic water pump and the solution applied to this problem provide a good approach.But because present photovoltaic water pump normally based on direct current system, needs the dc brushless motor and the corresponding special DC controller of design specialized, cost is higher relatively.The photovoltaic water pump technical bottleneck of having come out is comparatively obvious, the brushless water pump of the relative conventional AC of its technology is quite backward, practice shows that these products have very big defective in actual applications, and it is also very high to requirements in water quality, can't be applied to desert agricultural and highlands water quality.It costs an arm and a leg simultaneously, is difficult in agricultural production and the life to promote.
Summary of the invention
Technical problem to be solved in the utility model is, provide a kind of realize the control of the MPPT maximum power point tracking to photovoltaic array (MPPT), simultaneously be implemented in the photovoltaic water pump under the different sunshine conditions the frequency control function, solve the frequency converter that system stable operation control problem under the intensity of sunshine sudden change situation is used for solar photovoltaic water pump.
For solving the problems of the technologies described above, the utility model is by the following technical solutions: a kind of frequency converter that is used for solar photovoltaic water pump, include the data operation module, it is characterized in that also including the MPPT control module, the variable frequency regulating speed control module, described MPPT control module control photovoltaic array is in office when according to exporting with maximum power all the time under condition and the temperature conditions, described variable frequency regulating speed control module is exported the speed regulating control of finishing AC induction motor according to the frequency of MPPT control module, adopt different proportionality coefficients and integral coefficient when the rising of counterglow intensity descends with intensity of sunshine in the described variable frequency regulating speed control module respectively, and error is taked amplitude limit control.
As a kind of improvement, include and beat dried protection module.
As a kind of improvement, will beat the dried protection module number of starts and set greater than 5 times, per time interval of restarting for twice increases successively by the number of starts.
As a kind of improvement, will beat the dried protection module number of starts and be set at 7 times, the order of per time interval of restarting for twice by the number of starts is set at: 5 minutes, 10 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 3 hours.
The frequency converter that the utility model is used for solar photovoltaic water pump comprises MPPT control module, variable frequency regulating speed control module, the MPPT control module is mainly finished the control of the MPPT maximum power point tracking (MPPT) to photovoltaic array, and the assurance photovoltaic array can be exported its maximum power all the time; The difference of variable frequency regulating speed control module basis photovoltaic array output energy under difference energy condition at sunshine is finished the variable frequency regulating speed control to AC induction motor, guarantees the stability of a system under intensity of sunshine sudden change situation simultaneously.
The utility model will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is used for the system configuration schematic diagram of the frequency converter of solar photovoltaic water pump for the utility model;
Fig. 2 is the utility model parts variable frequency regulating speed control module controls theory structure schematic diagram;
Fig. 3 beats the logical schematic of dried protection module for the utility model parts.
Embodiment
As Fig. 1, Fig. 2, shown in Figure 3, a kind of embodiment that is used for the frequency converter of solar photovoltaic water pump includes data operation module 1, MPPT control module 2, variable frequency regulating speed control module 3.Data operation module 1 comprises: CPU element, A/D converting unit, data storage cell, real-time clock unit.CPU element is mainly finished the control to operation of data, peripheral interface equipment; Analog quantitys such as the AC and DC voltage that the A/D converting unit is responsible for sample circuit is collected, electric current are converted to digital quantity; Memory cell is finished the storage to important parameter in system's running and information; The unit provides correct time, calendar function for system in real time.Also including other the matching used module of frequency converter, all is known technology, no longer narration.
Concerning the AC induction motor of conventional mains supply, when load was big more, its needed supply current was big more, and this is because the output torque of motor will keep the balance with load torque.For the solar photovoltaic water pump system, when it can be alternating current that motor provides when big more, its load-carrying ability is also just strong more.And the maximum power point of photovoltaic array is also just corresponding to its maximum load that can drive, simultaneously also just corresponding to the maximum alternating current of machine operation this moment.According to this thought, as long as the size of real-time detection alternating current, and by continuous disturbance to the DC bus-bar voltage set-point, the variation of judgement alternating current can be finished the MPPT control to photovoltaic array, this MPPT implementation only need detect a parameter, reduce the complexity that detects parameter, made control simple efficient.MPPT control module 2 produces under the guidance of this design philosophy, the analog quantity that MPPT control module 2 arrives according to system acquisition is through computing, judgement, and direct voltage by operation control systems such as relevant hardware circuit execution, make its maximum power point place that works in photovoltaic array, guarantee that photovoltaic array is in office when according to exporting with maximum power all the time under condition and the temperature conditions.
Because the AC induction motor rotating speed satisfies following formula:
n=60f(1-S)/p (1)
In the formula, p is the asynchronous machine number of pole-pairs; S is the asynchronous machine revolutional slip.For pump-type load, revolutional slip s can be calculated by following formula:
S=Sn(f/fn) (2)
In the formula, fn is the rated speed of asynchronous machine; Sn is the revolutional slip of asynchronous machine under nominal load.Because asynchronous machine revolutional slip when rated load operation is no more than 5%, and f≤fn is arranged again, thus S ≈ 0, so can be approximately the linear ratio relation between asynchronous machine rotation speed n and its frequency f.Because under different sunshine conditions, the frequency f of MPPT control unit output changes, thereby finish speed regulating control to AC induction motor.The variable frequency regulating speed control module is the 3 error △ E that calculate between the actual value of the DC bus-bar voltage set-point set by the MPPT control module and the DC bus-bar voltage that obtains of sampling earlier, process PI(ratio-integration) controller obtains the running frequency f of motor, be converted to modulation degree M through f-M again, pass through the size of the PWM of each power device correspondence of SVPWM algorithm computation at last, through power controlling modular unit work behind the driver module, thus the drive motors operation.The motor and water pump system is a high-order inertia system, change when slow when sunshine since the time that the time constant of system inertia link and sunshine change compare and can ignore, so but system's even running.But sail or flock of birds reason such as flies over when causing sunshine energy cataclysm if any black clouds; then the time constant of inertial element be can not ignore; this moment is if system responses is slow excessively; light then cause motor concussion operation, heavyly then directly shut down; under this state, move for a long time as motor, certainly will cause the damage of equipment.It in the utility model head it off; used according to the different mining of the direction of suddenling change sunshine the PI controller has been optimized; when descending with intensity of sunshine, the rising of counterglow intensity adopts different proportionality coefficient Kp and integral coefficient Ki respectively; and according to the difference of the excursion size that jumps sunshine; taked amplitude limit control to error △ E; so just avoided because of jumping suddenly sunshine effectively; too fast the deciding of causing of stator frequency rising; the rotor slip is excessive; cause stator current excessive, finally cause the power output of photovoltaic array can't satisfy the situation that bearing power at this moment causes system crash to shut down.
What play the common employing of dried protection is a kind of bang-bang control mode, and promptly when low water level point, water pump is out of service; During high water level point, water pump brings into operation.Traditional dried protection of beating needs three liquid level sensors and a cover hardware circuit to finish jointly, certainly will increase the hardware cost of system like this.Beat dried protection module 4 optimal control processes in the utility model, reduce the input of hardware facility, as shown in Figure 3.Concretism is:
At first, measure the alternating current size of water pump when no-load running.
Secondly, be the no-load running state according to water pump beating when doing, (f 〉=fn), these two conditions of motor operating current little (Iac≤Iac_ zero load) go to judge whether system has been in dozen dried state to the rotating speed maximum.As eligible, then need carry out and beat dried stoppage protection, otherwise will continue operation.
At last because system do not have liquid level sensor, so the judgement that liquid level is recovered need by behind the certain interval of time once more starter motor carry out.For preventing that water pump is because of frequent starting causes too early wearing and tearing under the dried state beating; simultaneously again for fear of recovering in time not find out the waste that causes solar energy resources because of water level; beat dried protection module 4 numbers of starts and set greater than 5 times, per time interval of restarting for twice increases successively by the number of starts.
Better, will beat dried protection module 4 numbers of starts and be set at 7 times, the order of per time interval of restarting for twice by the number of starts is set at: 5 minutes, 10 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 3 hours.Add judging unit round the clock simultaneously, in case after judgement enters night, then no longer restart to beat to do and judge, until daytime next day.
Claims (7)
1. frequency converter that is used for solar photovoltaic water pump, include data operation module (1), it is characterized in that also including MPPT control module (2), variable frequency regulating speed control module (3), described MPPT control module (2) control solar energy photovoltaic array is in office when according to exporting with maximum power all the time under condition and the temperature conditions, described variable frequency regulating speed control module (3) is exported the speed regulating control of finishing AC induction motor according to the frequency of MPPT control module (2), adopt different proportionality coefficient (Kp) and integral coefficient (Ki) when the rising of counterglow intensity descends with intensity of sunshine in the described variable frequency regulating speed control module (3) respectively, and error (△ E) is taked amplitude limit control.
2. the frequency converter that is used for solar photovoltaic water pump according to claim 1 is characterized in that also including dozen dried protection module (4).
3. the frequency converter that is used for solar photovoltaic water pump according to claim 1 and 2, it is characterized in that will beat dried protection module (4) number of starts set greater than 5 times, per time interval of restarting for twice increases successively by the number of starts.
4. the frequency converter that is used for solar photovoltaic water pump according to claim 3; it is characterized in that beating dried protection module (4) number of starts and be set at 7 times, the order of per time interval of restarting for twice by the number of starts is set at: 5 minutes, 10 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 3 hours.
5. the frequency converter that is used for solar photovoltaic water pump according to claim 2 is characterized in that the described dried protection module (4) of beating is provided with judging unit round the clock.
6. the frequency converter that is used for solar photovoltaic water pump according to claim 3 is characterized in that the described dried protection module (4) of beating is provided with judging unit round the clock.
7. the frequency converter that is used for solar photovoltaic water pump according to claim 4 is characterized in that the described dried protection module (4) of beating is provided with judging unit round the clock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200008838U CN201910767U (en) | 2011-01-04 | 2011-01-04 | Frequency converter for solar photovoltaic water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200008838U CN201910767U (en) | 2011-01-04 | 2011-01-04 | Frequency converter for solar photovoltaic water pump |
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| Publication Number | Publication Date |
|---|---|
| CN201910767U true CN201910767U (en) | 2011-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200008838U Expired - Fee Related CN201910767U (en) | 2011-01-04 | 2011-01-04 | Frequency converter for solar photovoltaic water pump |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291593A (en) * | 2013-06-09 | 2013-09-11 | 北京吉阳技术股份有限公司 | Control method for photovoltaic water pump system |
| 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 |
| US9436201B1 (en) | 2015-06-12 | 2016-09-06 | KarmSolar | System and method for maintaining a photovoltaic power source at a maximum power point |
| CN108306580A (en) * | 2017-01-12 | 2018-07-20 | 大青节能科技股份有限公司 | Solar energy conversion equipment and mobile solar energy system |
-
2011
- 2011-01-04 CN CN2011200008838U patent/CN201910767U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291593A (en) * | 2013-06-09 | 2013-09-11 | 北京吉阳技术股份有限公司 | Control method for photovoltaic water pump system |
| CN103291593B (en) * | 2013-06-09 | 2016-06-29 | 北京吉阳技术股份有限公司 | A kind of control method being applied to photovoltaic water pump system |
| 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 |
| US9436201B1 (en) | 2015-06-12 | 2016-09-06 | KarmSolar | System and method for maintaining a photovoltaic power source at a maximum power point |
| CN108306580A (en) * | 2017-01-12 | 2018-07-20 | 大青节能科技股份有限公司 | Solar energy conversion equipment and mobile solar energy system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110727 Termination date: 20170104 |
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| CF01 | Termination of patent right due to non-payment of annual fee |