What is Net Metering?
Net metering is the concept used in Solar Power where discoms will allow Individuals and corporate's to feed power generated from Solar or any means to their grid . A net metering meter will be installed by Power distribution company(DISCOM) which measures power fed to grid and accordingly consumer will be charged or paid back. Alternatively, the meter, having the feature of recording both the import and export values.
Net metering is the concept used in Solar Power where discoms will allow Individuals and corporate's to feed power generated from Solar or any means to their grid . A net metering meter will be installed by Power distribution company(DISCOM) which measures power fed to grid and accordingly consumer will be charged or paid back. Alternatively, the meter, having the feature of recording both the import and export values.
Solar PV Power Generation:
Sunlight
is converted to electricity directly when made to fall on solar photovoltaic
(SPV) modules. This electricity generated is used for lighting and various other purposes.
Grid connected roof top solar PV system:
In recent
years solar PV systems became viable and attractive. Available roof-top area on the buildings can also be used for setting
up solar PV power plants which will leads to no expenses for land requirements for solar panels installations.
The
electricity generated from SPV systems can also be fed to the distribution or
transmission grid after conditioning to suit grid integration. There are two types of configurations available for connecting the solar power generated from the system.
(1) On grid
(2) Off grid
In On grid System power generated from solar panels is directly synchronized with existing power source of discom in such a way that solar power generated get consumed in systems and power cost get reduced by power generated by solar system. let's simplify the same with an example:- Suppose there is plant having Three phase 100 KW power requirements now the plant installed 5 KW three phase Solar power panels now in On grid system power generated from solar system is directly get reduced from total power requirement means there will be 95 KW requirement from DISCOM and user have to pay for 95 KW instead of 100 KW. This type of activity is most popularly used worldwide.
Now lets discuss Off Grid system. In off grid power generated from Solar panels is stored in batteries and later on used whenever there is requirement. e.g. in morning power is stored in Batteries and later on this stored power is used for lighting and other purposes by taking the help of Inverters.
Usually On grid System is most preferred as there is no requirement of Batteries . Also efficiency of On grid system is more then Off grid system.
(1) On grid
(2) Off grid
In On grid System power generated from solar panels is directly synchronized with existing power source of discom in such a way that solar power generated get consumed in systems and power cost get reduced by power generated by solar system. let's simplify the same with an example:- Suppose there is plant having Three phase 100 KW power requirements now the plant installed 5 KW three phase Solar power panels now in On grid system power generated from solar system is directly get reduced from total power requirement means there will be 95 KW requirement from DISCOM and user have to pay for 95 KW instead of 100 KW. This type of activity is most popularly used worldwide.
Now lets discuss Off Grid system. In off grid power generated from Solar panels is stored in batteries and later on used whenever there is requirement. e.g. in morning power is stored in Batteries and later on this stored power is used for lighting and other purposes by taking the help of Inverters.
Usually On grid System is most preferred as there is no requirement of Batteries . Also efficiency of On grid system is more then Off grid system.
How does it work?
Based
on available roof area solar PV panels will be installed on the roof of the
building. The output of the panels (DC electricity) connect to the power
conditioning unit / inverter which converts DC to AC. The inverter output will
be connected to the control panel or distribution board of the building to
utilise the power. The inverter synchronises with grid and also with any backup
power source to produce smooth power to power the loads with preference of
consuming solar power first. If the solar power is more than the load
requirement, the excess power is automatically fed to the grid. For larger
capacity systems connection through step up transformer and switch yard may be
required to feed the power to grid. Operation and Maintenance Requirements:
There are no moving parts in the system and it requires only minimal attention.
Depending upon the dust level, the system requires periodic cleaning.
Advantages:
The
grid connected roof top solar PV system would fulfil the partial / full power
needs of large scale buildings. The following are some of the benefits of roof
top SPV systems:
· Generation of
environmentally clean energy.
· Consumer becomes
generator for his own electricity requirements.
· Reduction in electricity
consumption from the grid.
·
Reduction in diesel consumption wherever DG backup is provided.
· Feeding excess power to
the grid.
Implementation:
a)
Implementation of net metering facility shall be made applicable for the
consumers having 3-phase supply service connection.
b)
Protection system including its switch gear has to be certified by concerned
DE/MRT Operation. Further, harmonic suppressive device has to be installed by
such SPV generator to suppress the harmonics injection as harmonics is more in
case of solar plants where conversion of DC to AC is taking place (Islanding
protection requirements are enclosed).
c)
The SPV generator shall provide the indication of solar PV plant at the
injection point for easy identification to the operating personnel.
d)
The SPV generator needs to get statutory approvals from appropriate authority
(CEIG) for the connected equipment including its solar panels.
e)
The proposed generator shall submit the prescribed application to the concerned
DE/Opn.
f)
The net meter / meter to be used for arriving net energy shall have the
specifications prescribed.
g)
Concerned DE/Opn and DE/MRT will issue a technical feasibility certificate and
witness the synchronization of SPV plant with distribution network.
h)
0.2 class accuracy, tri-vector based energy meter, non ABT having the MRI
downloading facility along with related accessories shall have to be installed
by the SPV generator as per the specifications of APTRANSCO/APDISCOMS.
Alternatively,
DISCOM may provide the metering arrangement after receiving entire estimated
cost from such generator.
i)
SPV generator needs to provide an insurance coverage of Rs.5.00 lakhs per annum
to meet the expenditure that may be aroused due to electrocution in the event
of failure of connected protective and switch gear.
j) Spot billing is to be arranged by concerned
ADE/Opn as per the billing period. DISCOM shall arrange to develop suitable
software and incorporate in the billing instrument for such billing.
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