Single Phase Transformer Based Inverter For Nonlinear Load
Application Using PI Controller
R. Ramesh1, A. John Dhanaseely2, P. Pughazendiran3
PG Student1, Associate professors, IFET College of Engineering, Villupuram.
Abstract
The paper presents a single phase transformer based inverter for nonlinear load application using PI controller.
A capacitive full bridge circuit is used to provide instant current under nonlinear load conditions and thereby
reducing the harmonics. A new proportional plus integral controller for inverter control is proposed to eliminate
the dc current component, and steady state error under heavy load applications.
The proposed controllers consist of PI controller act as voltage controller and DC offset canceller. The
experimental result derived by using the MATLAB software.
I. INTRODUCTION
Single phase inverter is widely used in
various application such as UPS, Renewable energy
conversion, power source etc. The single phase
inverter can be divided into half bridge, full bridge,
and three level structures. The main function of the
inverter is to provide an AC output voltage with less
voltage distortion under both linear and nonlinear
load applications. The inverter can be divided into
transformer based and transformer less types.
Although transformer less inverter without line
frequency transformer is placed in front of load for
isolation purpose, and to provide the compact size,
lowest cost, less voltage distortion from the line
frequency transformer and to provide fast response,
but there is no galvanic isolation between power
source and load.
The transformer based inverter has the
important characteristics is to provide the galvanic
isolation between power source and the load, with the
line frequency transformer between inverter and the
load. For safety application such as medical
installation , data center UPS system require isolation
between the output neutral and power source , the
transformer based inverter are heavy in demand.
The transformer based inverter has the
capable to block the DC voltage, and filter out the
high frequency noise generated by the inverter and to
increasing the output voltage range. Nonlinear load,
such as rectifier is very popular during this year.
Blocking the DC voltage is also very important for
the load contained magnetic component such as
inductor, and transformer.
DC voltage component exist in the output of
AC inverter which may cause saturation and increase
the power loss of line frequency transformer. The
voltage feedback signal is taking from the transformer at the inverter output and uses low pass
filter to separate the DC voltage, and thereby
reducing the control method.
LINK: https://www.researchgate.net/profile/Pugazhendiran_P/publication/266327044_Single_Phase_Transformer_Based_Inverter_For_Nonlinear_Load_Application_Using_PI_Controller/links/59cc7c9caca272bb050ce2e1/Single-Phase-Transformer-Based-Inverter-For-Nonlinear-Load-Application-Using-PI-Controller.pdf
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