An effective MPPT control techniques for active and reactive power control in grid connected PV system

Abstract

In the current power demand situation, the participation of renewable energy sources (RESs) such as wind, solar, geothermal and hydro are increasing continuously. Amongst RESs, solar- based power generation is more adopted due to the source availability and numerous technolog- ical advancement. Especially, the grid connected or grid-interfaced photovoltaic (GIPV) system is being accepted widely due to the cost effectiveness and ease of maintenance, as they elim- inate the need of installing batteries to store energy. Nevertheless, there are still many issues in the way to accept the GIPV system generally. In this respect, customers are facing some important issues such as the system size, surplus power and bounded use of the PV system. Moreover, it is also facing less effective maximum power point tracking (MPPT) techniques and control strategies to extract and exchange the power, respectively. Hence, to resolve these problems, such novel schemes are required which can reduce the size of the system, improves the MPPT and inverter control performances, utilized for the active power generation and re- active power compensation. Additionally, to expand the application of the PV system in other areas like electric vehicle (EV) based transportation system, a control scheme is also required. Hence, four different control schemes are proposed to resolve the aforementioned problems. Firstly, a novel control approach for a GIPV system has been developed. This novel ap- proach introduces a sensorless DC-link voltage control for a two-stage three-phase GIPV sys- tem, which reduces the system size and cost. The proposed two-stage system includes an intermediate boost converter (IBC) and pulse width modulation (PWM) strategy based voltage source inverter (VSI). In the first-stage control, the intermediate converter is incorporated with the MPPT technique.