A dynamic equivalent black-box model, based on Prony analysis is presented in this paper. The proposed model is suitable for dynamic studies of microgrids, considering changes in the active and reactive power, bus voltages, currents and frequency. The developed model is evaluated using simulation results obtained from a medium voltage microgrid and test measurements recorded in a low voltage mi...

The multilevel inverters have highly desirable characteristics in high power high voltage applications. The multilevel inverter was started first with diode clamped multilevel inverter. Later, various configurations have been came into existence for many applications. However the multilevel inverters have some demerits such as requiring higher number of components, PWM control method is complex...

i TABLE OF CONTENTS ii LIST OF FIGURES iv LIST OF TABLES vi LIST OF SYMBOLS vii CHAPTER

Environmentally friendly renewable energy technologies such as wind and solar energy systems are among the fleet of new generating technologies driving the demand for distributed generation of electricity. Power Electronics has initiated the next technological revolution and enables the connection of distributed generation (DG) systems to the grid. The challenge is to achieve system functionali...

Because of the special fault-current characteristics of the inverter-interfaced distribution generator (IIDG) , the conventional fault-analysis method based on the synchronous generator cannot be used for the power grid with IIDGs. The paper points out the problems of using the conventional fault-analysis method for the power grid with IIDGs and proposes a novel fault-analysis method for the po...

In this paper grid connected photovoltaic generation system to mitigate the lower order harmonics by using SHE PWM inverter is discussed. In Renewable sources, solar photovoltaic system is more flexible and pollution free. Then SHE PWM inverter is used to maintain the output voltage with reduced selective harmonics ( 5, 7, 11, 13 ). The system is proposed to reduce selective harmonics in the ou...

With the aid of power quality monitoring systems (PQMSs), accurate locating of voltage sag sources, which has important significance for guiding maintenance personnel in finding and repairing faults as well as improving power supply reliability, has been becoming a new research hotspot. However, existing methods have unsatisfactory locating accuracy due to the integration of distributed generat...

ABSTRACT The main focus of this paper is to control the active power supplied by distributed generation (DG) system while compensating harmonics and reactive currents caused by the nonlinear loads using shunt active power filter (APF). The APF control is based on load currents sensing for reference current estimation in a-b-c reference frame. In order to get the grid currents sinusoidal and in-...

In this paper, we present the virtual prototyping of a solar array with a grid-tie implemented as a distributed inverter and controlled using distributed algorithms. Due to the distributed control and inherent redundancy in the array composed of many panels and inverter modules, the virtual prototype exhibits fault-tolerance capabilities. The distributed identifier algorithm allows the system t...