US20150093255A1 - Method and arrangement for controlling a solar powered pump - Google Patents

Method and arrangement for controlling a solar powered pump Download PDF

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Publication number
US20150093255A1
US20150093255A1 US14/498,188 US201414498188A US2015093255A1 US 20150093255 A1 US20150093255 A1 US 20150093255A1 US 201414498188 A US201414498188 A US 201414498188A US 2015093255 A1 US2015093255 A1 US 2015093255A1
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US
United States
Prior art keywords
inverter
voltage
limit
photovoltaic panel
panel system
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/498,188
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English (en)
Inventor
Ahmed Syed
Chetan Patange
Deepak Pandey
Laxmikantha Shenoy
Mikko Lammi
Rahul Raj
Satyan Rn
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ABB Schweiz AG
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ABB Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Assigned to ABB OY reassignment ABB OY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LAMMI, MIKKO, PANDEY, DEEPAK, PATANGE, CHETAN, RAJ, RAHUL, RN, SATYAN, SHENOY, LAXMIKANTHA, SYED, AHMED
Publication of US20150093255A1 publication Critical patent/US20150093255A1/en
Assigned to ABB SCHWEIZ AG reassignment ABB SCHWEIZ AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ABB OY
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • 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

Definitions

  • the present disclosure relates to pumping processes, such as pumping processes using power from a photovoltaic module.
  • Photovoltaic modules or solar panels are widely used for generating electrical power.
  • electrical power from the photovoltaic panels can be consumed directly, stored in a battery or fed to electrical grid.
  • the load may be for example a motor for a specific purpose, such as pumping. In such a case the motor rotates the pump if power is available from the photovoltaic panel system.
  • the output of photovoltaic panels depends on atmospheric conditions. Clouds in the sky may temporarily shadow the photovoltaic panels from sunlight which immediately affects the output from the photovoltaic panels. Further, the temperature of the photovoltaic panels has an effect on the power output.
  • a maximum power point tracker can be employed for extracting the maximum power from the photovoltaic panels. Such a tracker operates to change the operation point of the photovoltaic panel so that as much power as possible is obtained. For changing the operation point of the photovoltaic panel, the output voltage or current from the photovoltaic panel is changed.
  • An AC motor such as an induction motor
  • the induction motor uses alternating voltage and for that purpose an inverter is connected to feed the motor.
  • inverters are converter devices which are able to produce alternating voltage from a DC voltage source using a pulse width modulation technique.
  • the pumping systems with maximum power point trackers can be complicated and expensive devices.
  • a simpler structure can be obtained by connecting an inverter directly to the output of the photovoltaic panel system or photovoltaic panel.
  • the inverter obtains variable DC voltage as its input voltage.
  • the inverter can be operated with variable DC voltage, but problems can arise when an actual DC voltage level falls below the low voltage level of the inverter. This will stop the operation of the inverter. This may happen when, for example, clouds are shadowing the panels temporarily.
  • the inverter stops modulation for the reason of low input voltage the operation is not continued automatically, and the user has to manually start the inverter again.
  • a method for operating a pump in a pump system having a photovoltaic panel system, an inverter electrically connected to the photovoltaic panel system, and a motor driving the pump and electrically connected to an output of the inverter comprising: setting a voltage limit for the inverter; monitoring voltage produced by the photovoltaic panel system; operating the inverter for rotating of the motor when the voltage produced by the photovoltaic panel system is above the voltage limit; and disabling use of the inverter when the voltage of the photovoltaic system is below the voltage limit.
  • a pump arrangement comprising: a photovoltaic panel system; an inverter electrically connected to the photovoltaic panel system; a motor driving a pump and electrically connected to an output of the inverter; means for setting a voltage limit for the inverter; means for monitoring voltage produced by the photovoltaic panel system such that the inverter will be controlled to operate for rotating the motor when a voltage produced by the photovoltaic panel system is above the voltage limit; and means for disabling use of the inverter when a voltage produced by the photovoltaic system is below the voltage limit.
  • FIG. 1 shows a simplified block diagram of an exemplary pumping system driven by an inverter.
  • Exemplary embodiments are based on an idea of enabling operation of an inverter when an output voltage from a photovoltaic panel system exceeds a settable voltage limit.
  • the inverter directly connected to the output of the photovoltaic panel system, is operated only after the voltage has risen to a certain level, the operation of the inverter can operate more reliably.
  • the inverter can set itself to an operation mode in which it waits for the voltage to rise again. Thus, the inverter does not have to be started again since it does not shut down for low input voltage.
  • a user of the inverter can also set a minimum rotational speed limit for the pumping operation.
  • the rotational speed of the pump in a pumping system is low, the pump is not necessarily capable of producing flow. This may wear the pump excessively since the pumped liquid is not cooling the pump.
  • FIG. 1 shows a simplified block diagram of an exemplary pumping arrangement as disclosed herein.
  • a photovoltaic (PV) panel system is connected to the input of an inverter.
  • the term photovoltaic panel system refers, for example, to any combination of photovoltaic panels, modules or strings, and can also be a single panel.
  • the PV panels produce DC voltage, and thus the output from the PV panels is directly connected to the input of the inverter.
  • the output of the three phase inverter is further connected to a three phase AC motor, which is for example an induction motor.
  • a pump is further mechanically connected to the motor such that the pump is rotated together with the motor.
  • a voltage limit is set. Once the voltage of PV panel system connected to the voltage input of the inverter exceeds or reaches the set limit, the inverter is started and it starts modulating; i.e., producing output voltage to the motor. The inverter will produce the output voltage for a corresponding motor speed. If the pump is unable to reach the minimum speed as defined for example by the user, then the inverter will shutoff and wait for set restart time before restarting once again. This process will continue until the pumps starts working above the speed limit set.
  • the inverter starts controlling the motor according to the control scheme of the inverter.
  • the motor may be controlled with any known control method for rotating the motor.
  • the inverter may employ, for example, a known constant volts per hertz scheme, in which a ratio between the output voltage of the inverter and the frequency of the output voltage is kept constant.
  • the user of the system can set a certain program in the inverter. This program may, for example, maximise the pumping process outcome by driving the motor and the pump at a maximum available rotational speed without exceeding the maximum rotational speed limit.
  • the voltage may drop below the set limit for some reason.
  • the voltage may drop, for example, due to temporary clouding.
  • the use of the inverter is disabled. Once the use of the inverter is disabled, it does not produce output voltage, but it actively monitors the input DC voltage. If the DC voltage rises again above the limit, then the inverter starts its modulation again.
  • the use of the voltage limit saves the motor from being run with a low voltage.
  • a method can include setting a minimum rotational speed limit.
  • the inverter can continuously monitor the rotational speed of the motor and the pump.
  • the modulation of the inverter is disabled; i.e., the inverter does not produce voltage to the motor.
  • the pumping system is stopped for the reason of low rotational speed for ensuring that the pump will not be damaged.
  • the inverter checks whether the voltage from the panel system is above the set limit.
  • the operation of the inverter is started.
  • voltage level and dry run functionality for example can be checked.
  • a predefined set restart time gap can be provided for the automatic restart of the inverter.
  • a longer settable restart time can be allowed. This time can depend on, for example, an area of pump installation considering the water recovery in that particular area and the user can set a time for restart accordingly.
  • the voltage limit can be chosen such that the voltage limit corresponds to a certain percentage of the nominal value of the open circuit voltage of the PV panel system.
  • the selected percentage may be in an exemplary range of 50 to 80% of a nominal value of the open circuit voltage.
  • the voltage limit can affect the operation of the inverter in such a way that, as the limit value is lower, the pump is driven with a lower voltage, and an output from the pump is obtained with lower voltages.
  • the limit value may also be selected based on the nominal values of the motor driving the pump.
  • the rotational speed limit may be chosen such that when operating near the voltage limit, the power obtainable from the PV panel system is enough to rotate the pump with speeds higher than the limit.
  • An exemplary arrangement disclosed herein can include a photovoltaic panel system 1 , an inverter 2 electrically connected to the photovoltaic panel system and a motor 3 driving the pump and electrically connected to the output of the inverter 2 .
  • the arrangement can include means (e.g., a user interface) for setting a voltage limit for the inverter. This voltage limit may be set directly to the inverter as a parameter.
  • the arrangement can include means for monitoring the voltage produced by the photovoltaic panel system (e.g., a voltage sensor).
  • the inverter can include measurement circuits that are used for determining the input voltage.
  • the inverter can be further adapted to operate for rotating the motor when the voltage produced by the photovoltaic panel system is above the voltage limit.
  • a simple comparison logic circuit or software module can be included. The set limit and the monitored voltages are compared, and when the inverter detects that the monitored voltage is above the limit, the inverter is operational to rotate the motor.
  • the arrangement can include means for disabling the use of the inverter when the voltage of the photovoltaic system remains below the voltage limit (e.g., a disable switch).
  • the means for disabling the use of the inverter can include circuitry in the inverter that stops the modulation of the inverter.
  • a clock circuit can be included in the inverter.
  • the output of the clock circuit can be compared with the time interval in the inverter.
  • inverters can include a certain amount of calculation capacity for the purpose of simple comparisons and calculations.
  • Other embodiments of the method disclosed herein may also be implemented using an inverter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Electric Motors In General (AREA)
US14/498,188 2013-09-27 2014-09-26 Method and arrangement for controlling a solar powered pump Abandoned US20150093255A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN4397/CHE/2013 2013-09-27
IN4397CH2013 IN2013CH04397A (enrdf_load_stackoverflow) 2013-09-27 2013-09-27

Publications (1)

Publication Number Publication Date
US20150093255A1 true US20150093255A1 (en) 2015-04-02

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US14/498,188 Abandoned US20150093255A1 (en) 2013-09-27 2014-09-26 Method and arrangement for controlling a solar powered pump

Country Status (4)

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US (1) US20150093255A1 (enrdf_load_stackoverflow)
CN (1) CN104518549A (enrdf_load_stackoverflow)
AU (1) AU2014224159B2 (enrdf_load_stackoverflow)
IN (1) IN2013CH04397A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105089965A (zh) * 2015-08-31 2015-11-25 上海俊玥能源科技有限公司 一种交流光伏水泵系统及其控制方法
US11205896B2 (en) 2018-11-21 2021-12-21 Black & Decker Inc. Solar power system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108258942B (zh) * 2017-12-29 2020-08-25 珠海天兆新能源技术有限公司 一种太阳能光伏驱动的单相水泵的降频启动方法
CN109595146B (zh) * 2018-11-01 2020-09-01 海信容声(广东)冰箱有限公司 压缩机控制设备和方法
ES2753221B2 (es) * 2019-07-25 2020-11-05 Eos Itr S L Circuito electrico para alimentacion de bombas centrifugas

Citations (3)

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Publication number Priority date Publication date Assignee Title
US4999560A (en) * 1985-06-11 1991-03-12 Kabushiki Kaisha Toshiba Electric motor running system employing photovoltaic array
US5355749A (en) * 1991-12-20 1994-10-18 Hitachi, Ltd. Control apparatus and control method for motor drive vehicle
US20070290651A1 (en) * 2006-06-14 2007-12-20 Worldwater & Power Corp. Solar power control using irradiance

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JPS59131777A (ja) * 1983-01-19 1984-07-28 Toshiba Corp 太陽電池を電源とするポンプ駆動装置
JP2833146B2 (ja) * 1989-08-24 1998-12-09 富士電機株式会社 ソーラポンプシステムの制御装置
JP2000060179A (ja) * 1998-08-04 2000-02-25 Fuji Electric Co Ltd ポンプ駆動用太陽光インバータの制御方法
US7126294B2 (en) * 2002-01-31 2006-10-24 Ebara Corporation Method and device for controlling photovoltaic inverter, and feed water device
US7148650B1 (en) * 2005-06-22 2006-12-12 World Water & Power Corp. Maximum power point motor control
CN102401608B (zh) * 2011-11-30 2013-03-20 南京大洋冷却塔股份有限公司 一种基于能量管理和智能控制的太阳能冷却塔

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4999560A (en) * 1985-06-11 1991-03-12 Kabushiki Kaisha Toshiba Electric motor running system employing photovoltaic array
US5355749A (en) * 1991-12-20 1994-10-18 Hitachi, Ltd. Control apparatus and control method for motor drive vehicle
US20070290651A1 (en) * 2006-06-14 2007-12-20 Worldwater & Power Corp. Solar power control using irradiance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105089965A (zh) * 2015-08-31 2015-11-25 上海俊玥能源科技有限公司 一种交流光伏水泵系统及其控制方法
US11205896B2 (en) 2018-11-21 2021-12-21 Black & Decker Inc. Solar power system

Also Published As

Publication number Publication date
AU2014224159B2 (en) 2015-10-01
CN104518549A (zh) 2015-04-15
IN2013CH04397A (enrdf_load_stackoverflow) 2015-04-03
AU2014224159A1 (en) 2015-04-16

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