Abstract
The paper develops a technique for arbitrary power sharing among three-phase winding sets of a multiphase generator. Multiple d - q modeling is commonly used when independent control of the winding sets is required. This paper utilizes instead the vector space decomposition modeling as the starting point and combines it with a multiple d - q approach to preserve the advantages of the vector space decomposition, while still enabling independent control over each winding set. The power sharing is achieved by imposing appropriate x - y currents at the fundamental frequency so that the flux and average torque are not affected. The theory is developed initially for the nine-phase machine. A general expression for arbitrary current sharing is derived further for any multiphase machine with multiple three-phase windings. The obtained equations are valid for any possible machine topology (asymmetrical/symmetrical, with single or multiple neutral points). The theory is validated experimentally using an asymmetrical nine-phase induction generator with indirect rotor field oriented control.
Highlights
Use of wind energy conversion systems (WECS) is increasing and the world annual growth in wind power production in 2015 was 63 GW
Provided that vector space decomposition (VSD) transformations (2), (13), (16), (17) are used for machine model’s decoupling, the analysis shows that
The possibility of arbitrary current/power sharing between three-phase winding sets of a multiphase machine has been addressed in this paper
Summary
Use of wind energy conversion systems (WECS) is increasing and the world annual growth in wind power production in 2015 was 63 GW. The total installed power reached 433 GW [1] and the size of the wind turbines has increased. When compared to the three-phase equivalents, multiphase machines have lower current/power per phase, lower torque ripple and above all are inherently fault tolerant [11,12,13]. These advantages make them well suited for remote offshore wind farms. The dominant multiphase stator design is the one with distributed windings, which produces near-sinusoidal flux distribution. This machine type is considered in this paper
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