Hardware Investigation of a New Phase Balancing Topology for Supplying Single-Phase Loads using Three-Phase SEIG

This paper presents a new topology that focuses on feeding single-phase (l-ph) remote load by delta-connected three-phase (3-ph) SEIG (self-excited induction generator) which is excited through capacitor bank of star connection. In this topology, keeping the value of an excitation capacitor fixed, the value of other two balancing capacitors varies with varying l-ph load and rotational speed of the machine. For analyzing the total circuit under steady-state scenario, symmetrical component technique is used which helps to get three highly non-linear equations that are solved using ‘fsolve’ to obtain three unknowns i.e. values of: (i) per unit (p.u.) frequency and (ii) other two capacitors for performing an ideal balanced operation. Hardware investigation of the proposed topology with different l-ph loading indicates: (i) perfect balancing in phase-to-phase voltages and stator currents; (ii) improvement in frequency with the increase of load and (iii) voltage and current unbalance factor (i.e. VUF and CUF) being almost 0%.