Parallel operation of three-phase self-excited induction generators with different numbers of poles

Abstract

Many studies have analysed the steady-state of the isolated self-excited induction generator (SEIG) under balanced/unbalanced conditions. The parallel operation of SEIGs has also been widely studied. However, these analyses have the hidden assumption of an equal number of poles in all the parallel-connected machines. The necessity for expanding the already established power system in addition to integrate different renewable energy sources requires the parallel operation of SEIGs with different numbers of poles. This paper presents a steady-state analysis of parallel-operated SEIGs with different numbers of poles. A mathematical derivation is performed to obtain an equivalent circuit model considering different numbers of poles for each machine. The model is also valid for the case of an equal number of poles. The feasibility of the operation is proven, and the steady-state performance under different conditions are outlined. The analysis is experimentally verified. The computed values are in good agreement with the measured ones. This study is expected to contribute to the expanded application of the SEIG and its integration with renewable energy sources.