Simplified P&O-Based Performance Analysis of Three-Phase IIG-Based MHPCS for Single-Phase Household Applications

This article presents a simplified perturb and observe (SP&O)-based method designed for controlling the power transition between a single-phase domestic load and a controlled dc load supplied from a three-phase isolated induction generator (IIG) paired with an uncontrolled microhydro turbine in remote hilly regions. The successful operation of the controller relies on accurate feedback from sensors, which serve as input signals. Specifically, two sensors-one for voltage and another for current measurement-have been used to provide input to the real-time implementation (RTI) platform. The voltage sensor uses the IC AD202KY, positioned across the point of common coupling (PCC) of the IIG, while the current sensor, LA 55-P, measures the domestic load current. To enhance signal quality and regulate feedback voltages, additional signal conditioning circuits (SCCs) based on IC TL084 and IC LF353 are connected to the voltage and current sensors, respectively. These SCCs filter out noise signals and ensure optimal performance. Furthermore, the authors propose an external excitation scheme for the three-phase IIG, incorporating two capacitors ( 1C(P) - 1C(S )scheme), to facilitate single-phase household supply. This novel proposed method has been practically verified on a three-phase, 415-V, 1.5-kW induction generator using the dSPACE 1104 as the RTI platform, with a sampling time of 1 ms. Notably, the proposed method demonstrates reduced power fluctuations and terminal voltage oscillations in domestic loads during sudden main load applications, highlighting its effectiveness in achieving smooth power transitions.