Single Phase Transformer Based Inverter For Nonlinear Load Application Using PI Controller R. Ramesh, A. John Dhanaseely, P. Pughazendiran

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