PV inverters are used in the field of solar
photovoltaic inverter dedicated . It will direct current generated by solar
cells through the power electronic conversion technology converts directly into
the grid , load sharing power. Photovoltaic system is indispensable core
components.
The core of the inverter unit switching the
inverter circuit , referred to as the inverter circuit . The circuit through
the power electronic switch turn-on and turn-off to complete inverter function.
For inverter classified in many ways, for example : According to the inverter
output AC voltage phase can be divided into single-phase and three-phase
inverter inverter ; inverter used according to different types of semiconductor
devices , but also divided transistor inverter, thyristor inverters and
turn-off thyristor inverters .
According to the principle of the invertercircuit different , can be divided into self-oscillating inverter, step wave
superimposed pulse width modulation inverter and inverter and so on. Depending
on the application and network systems , or in off-grid systems can be divided
into grid-connected inverter and off-grid inverter.
Centralized Inverter: Inverter technology
is the focus of a number of parallel PV strings are connected to the same
central inverters DC input terminal , the general power of the IGB T
three-phase power modules, power smaller using field-effect transistors , while
the DSP switch controller to improve the quality of the produced electricity ,
making it very close to the sine wave current , generally used for large-scale
photovoltaic power plants (> 10kW) system.
String inverters : string inverter is based
on a modular concept based on each PV string (1-5kW) through an inverter , the
DC side has a maximum peak power tracking , parallel to the AC side grid . Many
large-scale photovoltaic power plants using string inverters .
Micro Inverter: in the micro- on grid inverter photovoltaic system , solar panels are access each one a micro inverter, when
the solar panels can not have a good job , only this one will be affected,
while other photovoltaic panels will be run in the best working condition ,
making the overall system more efficient, generating a greater amount .
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