Part of a series in
renewal energy technologies brought by M/s Paavi Solar
Friends
I feel sorry that yesterday I could upload any blog due to some personal
engagement. We have covered some of the components of the rooftop Solar PV System.
Today we are going to learn about Solar Inverter.
A Solar Inverter is a Balance of System component of a Solar PV System
and converts DC current generated by a
Solar Panel into Grid compatible(Pure Sinewave output with a specific voltage
and frequency) Alternating Current for running the AC load or export to the
Grid. Solar Inverter may have special
features like Maximum Power Point Tracking and Anti-Islanding feature for Grid
Protection. Here feature of Maximum Power Point Tracking means the ability of the
inverter to sense input Vmax from the panel and to maximize power
extraction. Anti -Islanding feature disables the inverter output, once the Grid supply
is disrupted and helps in protection of Grid maintenance personnel, who maybe
working on Grid.
Types of Solar
Inverters
1.
Stand Alone Inverters-
These inverters are used in Off- Grid Solar PV Systems where batteries have
been provided for storage as a backup measure. In this System, Solar PV cells
charge batteries through charge controllers and then batteries supply required
D.C. Current for conversion into usable A.C. Additionally these inverters may have
auxiliary charging circuits for charging the batteries from an auxiliary A.C. Source.
It may be worthwhile to mention here that if the user has only D.C. Equipment then
there is no need of any inverter and Batteries can be directly connected to
load through D.C.D.B. Additionally these inverters may have auxiliary charging circuits
for charging the batteries from an auxiliary A.C. Source.
2.
Grid-Tied Solar Inverter- These
inverters are the simplest form of Inverters without any charging function as On
Grid Solar PV System does not have any battery backup system. These inverters are
having Grid compatible features (Pure Sinewave output with specific voltage
and frequency). These inverters as said above have an anti-islanding feature to
shut down the inverter output in case of Grid shutdown.
3.
Hybrid Solar Inverter-These
are intelligent Grid Tied Inverter with features like auxiliary battery charger
circuit and priority setting like distribution of load on battery or Solar or
Grid and have MPPT features, Grid compatibility, and anti-islanding features.
These Hybrid Solar Inverters, if have additional features like output selector the mechanism, control algorithms are also called Power Conditioning unit.
New Development in inverter Technology- Micro-Inverters
Microinverters are very small inverters directly placed
behind the Solar PV Panel, encapsulated in an environmental hazard proof
casing. These inverters directly convert the DC from the Solar Panels into 240 V
AC for running the load. These microinverters have multiple ports for built on
current for maximizing power output.
How
to convert your normal inverter into Solar Inverter. In
our houses, normal inverters with battery bank back up are installed where a
battery charger circuit for charging the battery from input Grid Supply is
provided. During the Grid, failures Charged battery D.C. is converted into A.C.
to run the load, otherwise when Grid supply is available the inverter function
is disabled and the load is run directly by Grid supply. But for the conversion of a Normal
Inverter into Solar Inverter a charge controller device is inserted between the Solar
PV Panels and inverter for charging the battery from Solar.
-G P
BOSE
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