Simplified P &O MPPT Algorithm Based Performance Analysis and Control of Three-Phase IIG-Based MHPCS for Remote Single-Phase Household Applications

This paper introduces a Simplified Perturb and Observe algorithm for constant voltage and frequency operation of a three-phase Isolated Induction Generator (IIG) coupled to an ungoverned hydro turbine and supplying single-phase domestic loads. With a fixed excitation capacitor bank connected across the stator terminals, the IIG simultaneously supplies power to both ac load (main load) and controlled dc load (dump load). The output power of the generator is always maintained constant at its maximum value corresponding to the capacitor bank. The main advantage is that the developed algorithm not only tracks the maximum output power point of the generator but also diverts power smoothly from main load to dump load and vice-versa to maintain the voltage and frequency at constant value. An excitation scheme of three-phase IIG including two capacitors (1C(P)-1C(S) scheme) has been proposed for single-phase household supply. The electronic circuit is realized using an uncontrolled rectifier-chopper (diode-IGBT) combination connected across the IIG terminals supplying the controlled dc load. The proposed control algorithm has been experimentally implemented on a three-phase, 415 V, 2HP induction machine using dSPACE 1104 platform and the effectiveness of the algorithm has been tested for various transient conditions such as sudden application of main load.