Power electronic configuration for the operation of PV system in combined grid‐connected and stand‐alone modes

Abstract

A simple photovoltaic (PV) system capable of operating in both grid-connected mode and stand-alone mode using multilevel boost converter (MBC) and line commutated inverter (LCI) has been developed for extracting the maximum power and feeding it to a single phase utility grid and stand-alone system simultaneously. Theoretical analysis of the proposed system is done and the duty ratio of the MBC is estimated for extracting maximum power from PV array. For a fixed firing angle of LCI, the proposed system is able to track the maximum power with the determined duty ratio which remains the same for all irradiations. This is the major advantage of the proposed system which eliminates the use of a separate maximum power point tracking (MPPT) controller. Experiments have been conducted on a 80 V, 9.4 A PV array feeding a 110 V single phase grid and a 230 V, 100 W DC motor. The MBC extracts maximum power from the PV array and feeds the major portion of power to the single phase utility grid via LCI and the remaining power to separately excited DC motor. It was found that the theoretical analysis, simulation and experimental results closely correlate with each other and proves the effectiveness of the proposed configuration.

Hybrid carrier based space vector modulation for PV fed asymmetric cascaded multilevel inverter

“…The equivalent circuit is based on the following classical equation of PV cell which describes the relationship between the current and voltage of the cell [7].…”

FPGA‐based implementation for improved control scheme of grid‐connected PV system with 3‐phase 3‐level NPC‐VSI

“…1 Harnessing electrical energy with the aid of photovoltaic (PV) systems has garnered more attention due to its abundance in availability and ease of access across the globe. 4 However, the implications of increased grid integration of PV systems are manifold and calls forth the application of suitable control and protection strategies and power converter configurations to meet the interconnection standards, improve efficiency, and enhance power quality. 4 However, the implications of increased grid integration of PV systems are manifold and calls forth the application of suitable control and protection strategies and power converter configurations to meet the interconnection standards, improve efficiency, and enhance power quality.…”

“…2,3 The currently used configurations for PV systems are of stand-alone/grid-connected and single-stage/2-stage. 4 However, the implications of increased grid integration of PV systems are manifold and calls forth the application of suitable control and protection strategies and power converter configurations to meet the interconnection standards, improve efficiency, and enhance power quality. To cater to the needs, grid-interfaced inverters adapt the VSI topology with a current controller like hysteresis, linear PI and predictive dead-beat controllers to regulate the current into the grid.…”

Design of SPV System for Dc Link Voltage by Using Fuzzy Logic Controler

“…The energy storage (conventionally batteries) management is that the key element of the standalone system. Numerous issues associated with battery energy storage standalone alternative energy conversion systems area unit mentioned in [3]- [6]. Considering the issues related to energy storage systems, the grid interfaced systems area unit additional preferred, just in case the grid is a gift.…”