Abstract
Three-phase self-excited induction generator (SEIG) plays a vital role in micro-hydro systems (MHSs) to generate off-grid single-phase power for hilly terrain-based remote areas. In general, various capacitor excitation topologies (CETs) are available for supplying the requisite reactive power to the three-phase IG while producing single-phase power from the system. Generation of single-phase power from a three-phase SEIG driven by the MHS indicates a worst case of imbalance in the system in terms of phase voltages and stator currents of the generator. This chapter aims to implement a new CET to generate single-phase power from an MHS-driven 2.2 kW three-phase SEIG, whose stator is connected in delta, and the excitation cum reactive power is supplied from a star connected capacitor bank. The proposed CET-IG system is simulated in MATLAB/Simulink and analyzed in steady state for supplying single-phase load under fixed SEIG speed with 55% loading. The result indicates that the recommended CET can effectually supply the single-phase load having voltage regulation of 1.26% and exhibiting a perfect balance in the phase voltages and stator currents of the three-phase SEIG. Hence, in order to generate clean-cum-sustainable power practically in a cheap way for the remote hilly areas from hydro resources at small scale level (i.e., MHS), the proposed CET-IG scheme seems to be an effective one. The recommended CET therefore can be seen to supply the single-phase load in an efficient way, keeping the phase voltages and stator currents of the SEIG balanced while supporting a loading of 55%.
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Acknowledgements
The authors thank the DST-SERB (EEQ/2020/00076) project for providing all the hardware equipment required for this experiment/study.
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Appendix
Appendix
2.2 KW IG parameter values: \({R}_{rotor}=2.87\Omega\), \({R}_{stator}=3.81\Omega\), \({X}_{rotor}={X}_{stator}=4.46\Omega\), \({L}_{rotor}={L}_{stator}=14.196mH\), pole number = 4 and moment of inertia (J) = 0.00759 kgm2.
Speed-torque characteristic of the prime mover at 1500 rpm: \({T}_{0}=1242.13\), \({K}_{1}=7.899\) and \({\omega }_{rot}=9.54\).
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Chakraborty, S., Pudur, R. (2024). Performance Enhancement of Three-Phase SEIG to Feed Single-Phase Load in Micro-hydro Systems Using a Novel Capacitor Excitation Topology. In: De, S., Agarwal, A.K., Kalita, P. (eds) Challenges and Opportunities of Distributed Renewable Power. Energy, Environment, and Sustainability. Springer, Singapore. https://doi.org/10.1007/978-981-97-1406-3_15
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