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INTRODUCTION TO PHOTOVOLTAIC
PUMPING SYSTEMS
Yingli Solar Academy
Yingli Green Energy Spain
April , 24th2014
Alic ia Canut Montesinos
Project Engineer
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Table of content
1. Introduction
2. Selection of pump type
3. Photovoltaic Pumping System Components
4. Photovoltaic Pumping Systems more usual settings
5. Sizing
6. New technologies
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Table of content
1. Introduction
2. Selection of pump type
3. Photovoltaic Pumping System Components
4. Photovoltaic Pumping Systems more usual settings
5. Sizing
6. New technologies
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Introduction
In the cases below, the option of Pumping Photovoltaic System is the
most adequate. Even in developed countries, if the grid is located more
than half kilometer:
Solar water pumping option is feasible for many agricultural producers.
The equipment available in the market are reliable, durable and easy to operate.
The initial cost is relatively high compared to other traditional options, but may be more
economical to long term due to its low cost of operation and maintenance.
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Introduction
The benefit of this pump technology has a greater impact when it is accompanied by
an overall improvement of the farming or ranching.
There are still vast rural areas where they do not reaches the conventional electricity
grid.
Water for human consumption or pets, characterized by low power demands, are still
taken from wells or rivers.
People do not have irrigation systems, or those they have, are inefficient.
Fossil fuels supply is very irregular or non existent.
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Table of content
1. Introduction
2. Selection of pump type
3. Photovoltaic Pumping System Components
4. Photovoltaic Pumping Systems more usual settings
5. Sizing
6. New technologies
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Selection of pump type
Selection of pump technology.
Id N o m b re d e t a r e a D ur ac i n C om ienzo
1 Senelec_Senegal 2 MW p 1 9d a s jue 27/ 03/14 lun 21/ 04/14
2 C ont r act S i gn at ur e 1 9 d as jue 27/ 03/14 lun 21/ 04/14
3Pr ecedent s C ondit i ons C ompli a n c e 2 7 d a s lun 31/ 03/1 4 d o m 04/ 05/14
4 G eot echnical S tu dy 1 7 d as lun 31/ 03/14 lun 21/ 04/14
5 Topographi c S tu dy 4 d a s lun 31/ 03/14 jue 03/ 04/14
6 R ecibo D ow npayment 10dasmar 22/04/1 4 d o m 0 4 / 0 5 /142
7 Acces & St ock area 33dasvi e28/03/ 1 4 v i e 0 9 / 0 5 /14
8 Engi neer i n g 1 05 d as lun 05/ 05/1 4 m i 24/ 09/143
Id N o m b re d e t a r e a Du r a c i n C o m ienzo
1 Senelec_Senegal 2M Wp 1 9 d as jue 2 7 / 0 3 /1 4 l un 21/ 04/ 14
2C ont ract S i gn at ur e 1 9 d as jue 2 7 / 0 3 /1 4 l un 21/ 04/ 14
3 Precedent s C ondit i ons C ompli a n c e 2 7 d a s lun 31/ 03/ 14dom 04/ 05/ 14
4 G eot echnical S tu d y 1 7 d as lun 3 1 / 0 3 /1 4 l un 21/ 04/ 14
5 Topographi c S tu dy 4 d a s lun 3 1 / 0 3 /1 4 j ue 03/ 04/ 14
6 R ecibo D ow npayment 10dasmar 22/04/14dom04/05/142
7 Acces & St ock area 33dasvi e28/03/14 vi e09/05/14
8 E n gi n ee ri n g 1 05 d a s lun 05/ 05/ 14mi 24/ 09/ 143
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Table of content
1. Introduction
2. Selection of pump type
3. Photovoltaic Pumping System Components
4. Photovoltaic Pumping Systems more usual settings
5. Sizing
6. New technologies
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Photovoltaoc Pumping System Components
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Modules:
Operation is defined by
I-V curve, radiation andtemperature.
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Batteries:
They are not often use in Pumping PV System.
Are necessary if there are no deposits to accumulate water or
when the flow rate, given by the well, doesnt cover demand
during the hours of sun. Also if an alternative use the generator is
given.
They have the advantage of allowing the operation of the pumpat any time and at constant power.
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Regulators:
They have assigned two basic functions:
1 -. Prevent Overload Generator batteries.
2 -. Prevent battery discharge more than permissible.
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Converters:
They can convert DC / DC and DC / AC.
The topology and control of DC / DC allows the system always
works at maximum generator power. It is called MPPT.
The DC / AC are required for connection of induction motors.
Normally incorporating a MPPT. Those are the inverters.
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Maximum peak power Tracker (MPPT):
Topology.
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Maximum peak power Tracker (MPPT):
Control
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Inverters
They have control over the voltage and frequency.
The knowledge of the wave shape is essential.
All current models have high efficiencies
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Single Phase Inverters (Square wave):
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DC Motors:
Classics (blades): maintenance problem
They have the advantage of high efficiency and easycontrol.
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AC Motors:
Induction or asynchronous, very robust and economic. Require
little maintenance.
They have the disadvantage of the inverter and its control is
more complex.
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Pumps:
Volumetric and positive displacement
Centrifugal
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Pumps:
Positive displacement (of piston and diaphragm, mainly). Ideals
for low flow and high altitudes gauge.
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Pumps:
Require a very high starting torque.
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Pumps:
Dynamic exchange or amount of motion (centrifugal). For large
flows and small and medium altitudes.
They are very simple, they have few moving parts and the starting
torque is very low, so it makes them ideal for using with engines
induction ..
They can be installed on the surface or submerged.
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Pumps:
Surface
Centrifugal pump
.
SumergeCentrifugal pump
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Table of content
1. Introduction
2. Selection of pump type
3. Photovoltaic Pumping System Components
4. Photovoltaic Pumping Systems more usual
settings
5. Sizing
6. New technologies
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Photovoltaic pumping systems more usual settings
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Photovoltaic pumping systems more usual settings
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DC solar pumping:
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Equipment with AC Motor.
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Coupling generator - engine - pump.
Curve A:Centrifugal pumps or
battery systems
Curve B:positive
displacement pumps
Curve C: Point Tracking
maximum power system
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Pumping battery support:
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Table of content
1. Introduction
2. Selection of pump type
3. Photovoltaic Pumping System Components
4. Photovoltaic Pumping Systems more usual settings
5. Sizing
6. New technologies
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Electric energy hydraulic energy + losses
Applications
Irrigation
Domestic use
Sizing
Maximumefficiency is
looked for
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Factors determining the configuration:
Hydraulic conditions :Evaluating the necessary hydraulic power.
Depth water level in the well under the surface
Static water lift height
Dynamic head: losses in pipes and fittings
Power supplied by generator
Sizing
Dynamic head: Hd = Pd - did+ Hc + heqt
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Photovoltaic along day: Solar Radiation: Evaluating the available
solar energy.
Weather Condition
Dimensioning the PV generator:Determining the peak power of the generator that is necessary set to
satisfy the water needs throughout the year.
Considerations:
1) It is supposed to work under standard conditions (25 1000 W/m2).
2) Point coincides with the MPPT work all day.
Sizing
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Electric energy needed = E. hydraulic /(average daily generator).Electric power generator (25 - 1000 W/m2).
(1)
Pp: CEM Electric Power (W).
g: gen performance. FV at 25 C.
A: Active Area of the modules.
(2) (2)
Ee: daily electricity (kWh).
fv= monthly average yield on Daily Generator operating conditions.Gdm = monthly average daily radiation incident on the plane of
generator (kWh/m2 day).
Sizing
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(3)
Fm = average coupling factor (ratio of the electrical energy generated in operationconditions and the electricity that would be generated if the system worked in the maximum
power point).
It can be taken as Fm = 0.95 for MPPT systems monitoring, 0.9 to centrifugal
pumps and 0.8 to other pumps.
= Coefficient of variation of the power with the cell temperature(from 0.004 to
0.005 / C).
Tc = daily average temperature of the modules during daylight hours.
Sizing
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The electrical energy required is given based on performance
Average daily motor subsystem - pump.
(4)
Substituting into equation 1 equation 2, 3, and 4, the power required peak
watts, depending on the Eh, radiation and engine performance subsystem
- pump is:
Sizing
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Tc can be estimated from the average ambient temperature and Global
incident irradiance G in the plane of the generator (average values
daytime):
Tc = Ta + 0.03 G.
The correction value of T in the equation can be replaced by
Ft = (1 - (Tc-25)) = 0.8 to 0.9 for warm and cold weather climates
respectively.
Sizing
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Ones the necessary pumping equipment is already defined.
Regarding type of pumps, manufacturers usually specify the diameter and
material of the pipe.
Sizing
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Table of content
1. Introduction
2. Selection of pump type
3. Photovoltaic Pumping System Components
4. Photovoltaic Pumping Systems more usual settings
5. Sizing
6. New technologies
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Variable Frequency Drive: The
range of allowable stresses for the
drive MX2 or RX are:
220V models: from 173Vcc to 400VDC,
recommended 310Vcc
400V models: 345Vcc up to 800Vdc,
recommended 535Vcc
New technologies
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Single Phase
New technologies
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Three Phase
New technologies