Grid Stability Analysis of Hybrid System Using VSI-PLL Circuitry and PCC Technique with Various Controllers using MATLAB/ Simulink

Abstract

Hybrid systems integrate various sources of renewable energy such as Solar, Wind and Hydro as well as others to generate electricity. The objective of this research paper is to create a Hybrid System connected to the Grid, which combines Photovoltaic (PV) and Wind Systems and to analyze the performance using MATLAB/ Simulink. The paper discusses essential control strategies for managing voltage, current, and power within the hybrid system. In this system, power conditioning phenomena are controlled by a DC to-DC boost converter, a voltage source inverter (VSI), and a PI controller. The paper also employs a voltage-oriented vector control approach for designing the three-phase inverter (VSI). Additionally, A Phased Locked Loop (PLL) is designed to align the VSI with the utility grid for synchronization purposes, with a PI controller serving the purpose of grid current control. The main contribution of this paper is its focus on generating a sustainable grid voltage while taking into account varying solar irradiation and fluctuating wind speeds. A key finding of this paper is that all grid signals maintain THD below 2% and overshoot within acceptable limits, which is gained through the tuning process of the controllers. The entire system, along with its performance, has been meticulously evaluated using MATLAB/ Simulink for simulation and in-depth analysis, demonstrating a rigorous and comprehensive assessment process.