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SOLAR-BIOGAS HYBRID POWER
ANU . A . N
S7 . E
ROLL NO : 101
3.Solar power system
7.Conversion of biogas into electricity
9. Future scope
Hybrid – term describes a combined power and energy storage
A hybrid energy system usually consist of two or more renewable
energy sources combined together to provide better efficiency.
Solar technology combines with biogas technology to form a hybrid
It has a huge positive impact on the power sector of country.
Consumers are not provided with proper supply
Inadequate power generation
High dependency on natural gas
Limited use of renewable energy sources
Solar Power System
o Solar panels
o Charge controller
o Battery system
Fig 1. Simple PV cell
Solar panels are the power source for all photovoltaic(PV)
A charge controller prevents overcharging and may protect
against overvoltage, which can reduce battery
performance or lifespan.
A battery system is used for storing output power.
An inverter converts dc power to ac . It has inbuilt protection against
short circuit, overheating .etc.
Photovoltaic means “electricity from light”.
They are solid state semiconductor device.
Produces electricity when exposed to light.
Metal surface is exposed to sunlight
Electrons in the valence
band absorbs energy and
jump to the conduction
band and becomes free.
The movement of this
free electrons causes
the flow of current.
Fig 2.Working principle of PV cell.
What is BIOGAS?
Gaseous mixture of methane,CO2,H2S and several other gases
formed by the biological breakdown of organic matter.
Process takes place in an oxygen deficient environment.
It is counted as an eco-friendly bio-fuel.
Biogas contains 60% of methane and carbon dioxide.
It can be used as a substitute for LPG and CNG.
There are mainly two types:
Fixed dome type biogas plant
Floating gas holder type of biogas plant.
Fixed dome type biogas
Biomass is mixed with equal quantity of water and forms slurry.
Slurry is fed to the digester through inlet tank.
When digester is partially filled, tank is left untouched for two months.
Anaerobic fermentation takes place.
As a result biogas starts collecting in
Spent slurry is collected from outlet
tank and used as manure.
Biogas is collected through gas control
valve as per the requirement.
Fig 3 Fixed dome type
Floating gas holder
Biomass is mixed with equal quantity of water.
Slurry fed to inlet chamber using inlet pipe.
Plant left unused for two months
Anaerobic fermentation takes place and produces biogas.
Biogas being lighter rises up and
starts collecting in the gas holder.
Gas valve of the gas holder is
opened to get the biogas.
Fig 4.Floating gas holder type
Conversion of biogas into electricity
Fig 5.Conversion of biogas into electricity
Biogas produced is used as a fuel in the combustion engine.
Fuel is converted into mechanical energy which drives a generator.
Generator produces electricity.
Fig 5.Diagram of a hybrid system
It is a combination of solar and biogas power generation.
Solar cells convert solar energy into electrical energy.
A voltage regulator regulates the output power and store in the DC
Biogas fuel is converted into electrical energy by means of a
A rectifier converts ac to dc.
The output is regulated by a voltage regulator and stored in the DC
DC output can be obtained directly.
Output may be stored in the day time in the battery bank.
AC output can be obtained by using a inverter.
Efficient use of renewable resources.
Provides nutrient rich manure for plants.
Continuous power supply.
Controls pollution by the disposal of waste.
High initial cost
Requires large area
Difficulty in proper disposal waste of biogas plant.
Conversion of biogas into electricity using fuel cells.
Technical knowledge of digestion, electric power generation process and
good management is required for profitable operation
Many researches are still going on to reduce following drawbacks:
High initial cost.
Methane forming bacteria is sensitive to thermal variation.
Power generation using renewable energy sources.
Provides stable power source.
Kanwardeep Singh, ”Study of solar/biogas hybrid power
generation”, Thapar University,Patiyala,2010.
Alliance for Rural Electrification(ARE),”Hybrid power systems
based on renewable energies”.
"Energy Sources: Solar". Department of Energy. Retrieved 19
International Energy Agency (2014). "Technology Roadmap: Solar
Photovoltaic Energy" (PDF). http://www.iea.org.
IEA. Archived from the original on 7 October 2014. Retrieved 7