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A Direct-Flux-Controlled Single-phase Electricity Generation of 3-phase Squirrel Cage Induction Machine

A novel direct-flux-controlled (DFC) scheme based 3-phase squirrel cage induction machine (SCIM) has been proposed in this paper to generate single-phase constant frequency electricity at variable rotor speeds. In the proposed scheme, the output is directly provided by an isolated stator phase winding of the machine without an intermediate converter stage. A small-scaled 3-phase power converter is connected with the terminals of remaining two-series connected phases and their neutral point to generate the voltage vector using the proposed DFC scheme. In the paper, the dynamic mathematical model, which accurately predicts the behavior of the proposed NPC-TSCAOI (Neutral-Point-Connected Two-Series Connected and One Isolated) configured 3-phase SCIM, is also given and the fundamental relationship between the stator flux and output is analysed. By directly controlling the modulus and rotating speed of the stator flux, the required single-phase output voltage can be well regulated. The proposed scheme is simple to be implemented, enables balanced operation of the generator and features fast transient response and high efficiency. Simulation results of a 3-kW prototype generator under various operating conditions are presented to demonstrate the viability of the proposed generator.