Performance evaluation of multiphase induction generator in stand-alone and grid-connected wind energy conversion system

• Published in: IET renewable power generation 2018-05, Vol.12 (7), p.823-831
• Main Authors: Chinmaya, K.A, Singh, Girish Kumar
• Format: Article
• Language: English
• Subjects: active power transmission monitoring; aerodynamics; asymmetrical six‐phase induction generator; asynchronous generators; indirect field oriented control; local resistive load; machine vector control; machine windings; maximum aerodynamic efficiency; multiphase induction generator; performance evaluation; power generation control; power generation reliability; power grids; power system measurement; power transformers; power transmission control; pulsewidth modulation converter; PWM power convertors; reactive power control; reactive power transmission monitoring; reliability; Research Article; self‐excited ASIG; stand‐alone grid connected wind energy conversion system; stand‐alone grid‐connected fixed speed grid‐connected variable speed operation; three‐phase winding set; transformer windings; vector‐oriented control; WECS; wind power plants; Y‐Δ‐Y three‐winding transformer
• ISSN: 1752-1416; 1752-1424; 1752-1424
• DOI: 10.1049/iet-rpg.2017.0791

This study presents a detailed performance analysis of multi-phase (six-phase) induction generator in conjunction with different types of wind energy conversion systems (WECS). It targets to emphasise the advantages of considering an asymmetrical six-phase induction generator (ASIG) in stand-alone, grid-connected fixed speed and grid-connected variable speed operation. Various aspects such as efficiency, reliability and productivity are considered while performing the analysis. In stand-alone mode, reliability and efficiency of the self-excited ASIG are ascertained by disconnecting one of the two three-phase sets connected to a resistive load. In grid-connected fixed speed mode, two different scenarios are implemented to pursue the applicability of ASIG. In the first scenario, only one three-phase winding set is connected to the grid and another set is connected to a local resistive load. In the second scenario, both three-phase windings are connected to the grid via Y−$\Delta $Δ/Y three-winding transformer. Variable speed operation in grid-connected mode is accomplished by employing back-to-back pulse-width modulation converters between the generator and grid. In this configuration, ASIG is operated with indirect field oriented control to obtain maximum aerodynamic efficiency. Transmission of active and reactive power is monitored with vector-oriented control. Experimental results of considered scenarios are presented to verify the viability of ASIG in various configurations of WECS.