Permanent magnet synchronous generators for regenerative energy conversion - a survey

Abstract

A survey on recently installed or developed permanent magnet (PM) synchronous generators for energy conversion in regenerative and alternative power supply systems is given. Its focus is for low speed machines on geared and gearless PM generator systems for wind power plants and small PM hydro generators in gearless coupling. For distributed co-generation of heat and electrical power by micro gas turbines specially designed PM generators for high speed are necessary. Design example for both low speed wind and hydro generators and high speed generators are given along with application examples.

Power maximization and voltage sag/swell ride-through capability of PMSG based variable speed wind energy conversion system

“…Both the brushes and gear box can be eliminated from WECS by using directly coupled low speed generators. Further, the elimination of gear box can increase the efficiency of wind turbine by 10% [9]- [10]. The low speed PMSG requires:…”

Design and Optimization of a 9-phase Axial-Flux PM Synchronous Generator with Concentrated Winding for Direct-Drive Wind Turbine

“…For this power level, two configurations using synchronous generators are reported: a first solution uses a direct-drive wound rotor ring generator [1], while the second one uses geared-drive PM radial-flux synchronous generator and a multilevel converter [2]. A 3 MW direct drive using a PM radial flux is also reported [3]. Generally, 3-phase or parallel connected 3-phase structures are used.…”

Factors influencing a micro-grid recovery process following a short-circuit

“…When moving into the variable-speed operation, direct driven squirrel-cage induction generators (SCIG) or permanent magnet synchronous generators (PMSG), equipped with a system of back-to-back converters appear as an adequate solution [3][4][5].…”