CN102570395A - Automatic identification and empty-fetch protection method for photovoltaic water pump frequency converter - Google Patents
Automatic identification and empty-fetch protection method for photovoltaic water pump frequency converter Download PDFInfo
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- CN102570395A CN102570395A CN2012100038372A CN201210003837A CN102570395A CN 102570395 A CN102570395 A CN 102570395A CN 2012100038372 A CN2012100038372 A CN 2012100038372A CN 201210003837 A CN201210003837 A CN 201210003837A CN 102570395 A CN102570395 A CN 102570395A
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- frequency converter
- pump frequency
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Abstract
The invention discloses an automatic identification and empty-fetch protection method for a photovoltaic water pump frequency converter. A digital signal processor (DSP) is used for continuously sampling the input voltage and the input current of the photovoltaic water pump frequency converter within a plurality of periods, calculating the input power of the photovoltaic water pump frequency converter, comparing the input power with the actual operation power of the photovoltaic water pump under the present frequency of the frequency converter, simultaneously monitoring the voltage deflection of a DC bus of the photovoltaic water pump frequency converter, further judging the balance relationship between the input power of the photovoltaic water pump frequency converter and the actual operation power of the photovoltaic water pump under the present frequency of the frequency converter, and outputting a corresponding control signal to the control the photovoltaic water pump, so as to achieve automatic identification and empty-fetch protection of the photovoltaic water pump frequency converter. According to the method provided by the invention, an extra device is added into the original photovoltaic water pump frequency converter system, the structure is simple, the installation and use are convenient, and the security and the stability of the photovoltaic water pump frequency converter are effectively improved.
Description
Technical field
The present invention relates to photovoltaic water pump converter technology field, be specially the automatic identification of a kind of photovoltaic water pump frequency converter and play dried guard method.
Background technology
Photovoltaic water pump system is made up of photovoltaic array, photovoltaic water pump frequency converter, photovoltaic water pump.The photovoltaic water pump system basic principle is that the photovoltaic array that utilizes semiconductor solar cell to form directly converts solar energy into electric energy, drives photovoltaic water pump from water source water lifts such as deep-well, river, river, lake and the pools through the photovoltaic water pump frequency converter then.
In photovoltaic water pump system; The photovoltaic water pump frequency converter is under the situation of continuous operation, and when systematic water level was brought down below the photovoltaic water pump impeller height, DC bus-bar voltage squinted; The output frequency of photovoltaic water pump frequency converter reaches certain frequency; Input power can reduce because of load reduction, and this moment, the output frequency and the input power of photovoltaic water pump frequency converter were uneven, and then caused photovoltaic water pump normally not move; Influence its result of use in commercial Application, therefore need beat and do protection photovoltaic system.
It all is to realize through extra Level monitor that dried guard method is played in existing ripe identification; Through real-time monitoring water level information and send a signal to host control device with control photovoltaic water pump; This method makes system hardware structure comparatively complicated; Improved the cost of system, it is also convenient inadequately to install and use.
Summary of the invention
The purpose of this invention is to provide the automatic identification of a kind of photovoltaic water pump frequency converter and play dried guard method; Beat and do protection and adopt extra Level monitor to realize making system hardware structure comparatively complicated to solve in the prior art photovoltaic water pump; Cost is higher, installs and uses inadequately problem easily.
For achieving the above object, the technical scheme that the present invention adopts is:
A kind of photovoltaic water pump frequency converter identification is automatically played dried guard method; It is characterized in that: the input voltage and the input current that adopt photovoltaic water pump frequency converter in digital signal processor DSP several cycles of continuous sampling; Calculate photovoltaic water pump frequency converter in each cycle input power and with the current frequency of frequency converter under the actual motion power of photovoltaic water pump compare; And whether squint, and then judge whether the actual motion power of photovoltaic water pump under input power and the current frequency of photovoltaic water pump frequency converter is equilibrium relation through digital signal processor monitoring photovoltaic water pump frequency changer direct current bus voltage; Be lower than the actual motion power of photovoltaic water pump under the current frequency when the input power of photovoltaic water pump frequency converter; And when digital signal processor monitors photovoltaic water pump frequency changer direct current bus voltage generation skew; Then this moment the photovoltaic water pump frequency converter input power and current frequency under the actual motion power of photovoltaic water pump be non-equilibrium state; Send control signal control photovoltaic water pump shutdown entering through digital signal processor DSP and beat dried guard mode; After playing dried protection end; Digital signal processor DSP is sampled again, calculates, is compared and the monitoring operation; When the actual motion power of photovoltaic water pump satisfied poised state and photovoltaic water pump frequency changer direct current bus voltage and squints under the input power of photovoltaic water pump frequency converter and current frequency, digital signal processor DSP sent control signal control photovoltaic water pump frequency converter and resumes operation, and discerns automatically in real time to beat and do protection.
Described a kind of photovoltaic water pump frequency converter identification is automatically played dried guard method, it is characterized in that: according to actual needs digital signal processor DSP is provided with the duration and the sampling period of beating dried guard mode.
The beneficial effect of the utility model is:
The inventive method does not increase extra means in original photovoltaic water pump frequency convertor system, simple to operation, has improved the fail safe and the stability of photovoltaic water pump frequency converter effectively, has realized that dried protection is played in the automatic identification of photovoltaic water pump frequency converter.
Description of drawings
Fig. 1 is the schematic diagram of the inventive method.
Fig. 2 is the flow chart of the inventive method.
Embodiment
Like Fig. 1, shown in 2, photovoltaic array inserts the photovoltaic water pump frequency converter, stablizes busbar voltage by the DC/DC DC voltage booster circuit, again by the variable sine wave drive photovoltaic water pump of DC/AC inverter circuit output frequency.When photovoltaic water pump frequency converter output frequency reaches certain frequency; Control section uses digital signal processor DSP; Sampling photovoltaic pump variable frequency device input voltage and input current calculate current photovoltaic water pump frequency converter input power, if photovoltaic water pump actual motion power is uneven under input power and this frequency; System discerned automatically to beat and did this moment, and photovoltaic water pump is carried out corresponding protection.
Adopt the input voltage and the input current of photovoltaic water pump frequency converter in digital signal processor DSP several cycles of continuous sampling; Calculate photovoltaic water pump frequency converter in each cycle input power and with the current frequency of frequency converter under the actual motion power of photovoltaic water pump compare; And whether squint, and then judge whether the actual motion power of photovoltaic water pump under input power and the current frequency of photovoltaic water pump frequency converter is equilibrium relation through digital signal processor monitoring photovoltaic water pump frequency changer direct current bus voltage; Be lower than the actual motion power of photovoltaic water pump under the current frequency when the input power of photovoltaic water pump frequency converter; And when digital signal processor monitors photovoltaic water pump frequency changer direct current bus voltage generation skew; Then this moment the photovoltaic water pump frequency converter input power and current frequency under the actual motion power of photovoltaic water pump be non-equilibrium state; Send control signal control photovoltaic water pump shutdown entering through digital signal processor DSP and beat dried guard mode; After playing dried protection end; Digital signal processor DSP is sampled again, calculates, is compared and the monitoring operation; When the actual motion power of photovoltaic water pump satisfied poised state and photovoltaic water pump frequency changer direct current bus voltage and squints under the input power of photovoltaic water pump frequency converter and current frequency, digital signal processor DSP sent control signal control photovoltaic water pump frequency converter and resumes operation, and discerns automatically in real time to beat and do protection.
According to actual needs digital signal processor DSP is provided with the duration and the sampling period of beating dried guard mode.
Claims (2)
1. a photovoltaic water pump frequency converter is discerned automatically and is played dried guard method; It is characterized in that: the input voltage and the input current that adopt photovoltaic water pump frequency converter in digital signal processor DSP several cycles of continuous sampling; Calculate photovoltaic water pump frequency converter in each cycle input power and with the current frequency of frequency converter under the actual motion power of photovoltaic water pump compare; And whether squint, and then judge whether the actual motion power of photovoltaic water pump under input power and the current frequency of photovoltaic water pump frequency converter is equilibrium relation through digital signal processor monitoring photovoltaic water pump frequency changer direct current bus voltage; Be lower than the actual motion power of photovoltaic water pump under the current frequency when the input power of photovoltaic water pump frequency converter; And when digital signal processor monitors photovoltaic water pump frequency changer direct current bus voltage generation skew; Then this moment the photovoltaic water pump frequency converter input power and current frequency under the actual motion power of photovoltaic water pump be non-equilibrium state; Send control signal control photovoltaic water pump shutdown entering through digital signal processor DSP and beat dried guard mode; After playing dried protection end; Digital signal processor DSP is sampled again, calculates, is compared and the monitoring operation; When the actual motion power of photovoltaic water pump satisfied poised state and photovoltaic water pump frequency changer direct current bus voltage and squints under the input power of photovoltaic water pump frequency converter and current frequency, digital signal processor DSP sent control signal control photovoltaic water pump frequency converter and resumes operation, and discerns automatically in real time to beat and do protection.
2. a kind of photovoltaic water pump frequency converter according to claim 1 identification is automatically played dried guard method, it is characterized in that: according to actual needs digital signal processor DSP is provided with the duration and the sampling period of beating dried guard mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100038372A CN102570395A (en) | 2012-01-09 | 2012-01-09 | Automatic identification and empty-fetch protection method for photovoltaic water pump frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100038372A CN102570395A (en) | 2012-01-09 | 2012-01-09 | Automatic identification and empty-fetch protection method for photovoltaic water pump frequency converter |
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| CN102570395A true CN102570395A (en) | 2012-07-11 |
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| CN2012100038372A Pending CN102570395A (en) | 2012-01-09 | 2012-01-09 | Automatic identification and empty-fetch protection method for photovoltaic water pump frequency converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151945A (en) * | 2013-03-19 | 2013-06-12 | 珠海天兆新能源技术有限公司 | Independently solar-powered single-phase water pump inverter and inversion method |
| CN103208777A (en) * | 2013-03-26 | 2013-07-17 | 攀枝花晶能太阳能科技有限公司 | Method for intelligently detecting water level and realizing fuzzy control in photovoltaic pumping system |
| CN104895774A (en) * | 2015-06-09 | 2015-09-09 | 合肥聚能新能源科技有限公司 | Control method of photovoltaic pump clustering system |
| CN106194632A (en) * | 2016-07-15 | 2016-12-07 | 石家庄漫特水泵制造有限公司 | The 380V three-phase electricity water pump of a kind of solar power and installation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101697423A (en) * | 2009-10-23 | 2010-04-21 | 安徽颐和新能源科技股份有限公司 | Non-active disturbance maximum power tracking method in photovoltaic grid-connected inverting system |
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- 2012-01-09 CN CN2012100038372A patent/CN102570395A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697423A (en) * | 2009-10-23 | 2010-04-21 | 安徽颐和新能源科技股份有限公司 | Non-active disturbance maximum power tracking method in photovoltaic grid-connected inverting system |
Non-Patent Citations (3)
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| 丛进等: "基于DSP56F8037的光伏水泵控制系统设计", 《电源技术应用》 * |
| 苏建徽: "光伏水泵系统及其控制的研究", 《中国优秀博士论文全文数据库》 * |
| 赖纪东: "户用光伏水泵变频控制器的研制", 《中国优秀硕士论文全文数据库》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151945A (en) * | 2013-03-19 | 2013-06-12 | 珠海天兆新能源技术有限公司 | Independently solar-powered single-phase water pump inverter and inversion method |
| CN103208777A (en) * | 2013-03-26 | 2013-07-17 | 攀枝花晶能太阳能科技有限公司 | Method for intelligently detecting water level and realizing fuzzy control in photovoltaic pumping system |
| CN104895774A (en) * | 2015-06-09 | 2015-09-09 | 合肥聚能新能源科技有限公司 | Control method of photovoltaic pump clustering system |
| CN106194632A (en) * | 2016-07-15 | 2016-12-07 | 石家庄漫特水泵制造有限公司 | The 380V three-phase electricity water pump of a kind of solar power and installation method |
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Application publication date: 20120711 |