Читать книгу Artificial Intelligence for Renewable Energy Systems - Группа авторов - Страница 12

Arif Iqbal1* and Girish Kumar Singh2

¹ Department of Electrical Engineering, Rajkiya Engineering College Ambedkar Nagar, Akbarpur, India

² Department of Electrical Engineering, Indian Institute of Technology Roorkee, Roorkee, India

Abstract

Owing to meet the incremental need of energy with exhaustion of fossil fuel in few upcoming years, renewable power generation has emerged as a potential and permanent solution in present scenario. In this regard, research has diverted toward exploration and development of various new techniques of renewable power generation for last few decades, and various systems have been adopted in both isolated and grid connected modes. Among various available options (solar, wind, biomass, tidal, etc.), the wind power generation system has a major market share due to its pollution-free operation together with its economic viability and mature technology. Presently, wind power generation system is increasing exponentially, particularly in on-shore sites of India and European subcontinents. Wind power generation system works on a successful operation and coordination of various parts, where an electric generator is an important component. Hence, the selection of suitable electrical machine (as generator) is of paramount importance for reliable operation of complete wind power generation system. Conventionally, three-phase electrical machine is employed. But, in last two decades, the multiphase (more than three-phase) machine is replacing the conventional one. This is because of various inherent potential advantageous features present in multiphase machines, when compared with its three-phase equivalent. This includes the elimination of lower order space, resulting in lower torque pulsation, enhanced power handling capability in the same frame (approximately 175%), and higher degree of freedom with improved reliability. Hence, multiphase machines have to be explored and investigated in various operational aspects for power generation. In this chapter, a six-phase synchronous machine is selected as a potential option as generator in grid connected mode for wind power generation system. An exhaustive dynamic analysis has been presented during various working conditions. Moreover, generator has been further investigated under steady state with the inclusion of small disturbance (i.e., small signal stability) through linearized model using dq0 approach. Linearized model was used to determine the absolute stability using eigenvalue criteria wherein, the effect of parametric variation is presented, related with both stator and rotor side. It was noted that the stability of generator operation can be enhanced with increased values of stator resistance. On rotor side, with higher value of leakage reactance of field winding circuit and/or by increased resistance of damper winding along q axis.

Keywords: Wind power generation, six-phase synchronous generator, small-signal stability, dynamic analysis