Rituparna Guchhayat

Induction machines have wide applications in renewable power system and particularly in wind turbine power systems. In case of standalone wind power system applications, for generating single phase electricity single phase or three phase induction machines can be used. Three phase induction generator can be used to generate single phase electricity at constant or above synchronous speed by using the two-series-connected-and-one isolated (TSCAOI) winding connection without an intermediate stage. In contrast with single-phase cage induction machines, three phase induction machines are significantly less expensive, more efficient, and smaller in frame size in comparison with their single-phase counterpart of similar power ratings. This paper introduces a novel cage induction generator and presents a mathematical model, through which its behavior can be accurately predicted. The proposed generator system employs a three-phase cage induction machine and generates single-phase, constantfr...

the paper proposes a new method of equal switching distribution that can be applied to cascaded multilevel inverters. This method is based on the fact that in the cascaded multilevel inverters, the output phase voltage is the sum of voltage waveforms produced by all cascaded cells. By periodically exchanging cells’ voltage waveforms, the proposed method ensures equal average switching’s distribution between all cascaded cells. This method is applied to the 13-level inverter, which consists of three cascaded 5-level H-bridge cells per phase. However, the proposed method can be extended to any desired number of voltage levels and applied to any type of cascaded multilevel inverter. Extensive simulation results of the tested 13level inverter with the equal switching distribution are presented. Moreover, the proposed method is compared to the standard control approaches and its advantages are shown.

This paper presents the enhancement of voltage stability using Static Synchronous Series Compensator (SSSC). The continuous demand in electric power system network has caused the system to be heavily loaded leading to voltage instability. Under heavy loaded conditions there may be insufficient reactive power causing the voltages to drop. This drop may lead to drops in voltage at various buses. The result would be the occurrence of voltage collapse which leads to total blackout of the whole system. Flexible AC transmission systems (FACTS) controllers have been mainly used for solving various power system stability control problems. In this project, a static synchronous series compensator (SSSC) is used to investigate the effect of this device in controlling active and reactive powers as well as damping power system oscillations in transient mode. The PI controller is used to tune the circuit and to provide the zero signal error. Simulation results have been presented in MATLAB/Simuli...