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This paper presents the operation of a grid-tied photovoltaic power generator considering a two stages configuration for active power injection. A Neutral Point Clamped Inverter (NPC Inverter) was used for the DC-AC conversion and a DC-DC Boost converter complemented the system configuration. The control system includes the following loops: a maximum power point tracking algorithm, a DC bus voltage...
This paper presents the modeling, design and simulation of a DC-DC converter suitable for photovoltaic applications. A Push-Pull topology has been chosen with peak current control (CIC) technique. In a first step the Push-Pull electrical design is made for a 200W nominal power and 380VDC output voltage. Following this a Push-Pull small signal model is presented, from which they are derived all transfer...
The main objective of this paper is to achieve a comparative study between two and three-level converters used in transformerless grid connected two-stage photovoltaic systems. For this purpose, a numerical model of the conversion system has been implemented in Matlab/Simulink software. It consists of a PV array feeding a DC/DC converter as well as a three-phase voltage source converter that ensures...
This paper presents a grid connected cascade dual buck inverter with Sensorless current control method to utilize the present renewable energy structure. A grid-tie control system is proposed for cascaded dual-buck inverter with both active and reactive power flow capability in a wide range for renewable energy and distributed generation sources. A cascaded two switch dual buck inverter with two power...
As the output power of the photovoltaic (PV) cell changes with the insolation , PV cell temperature and cell voltage changing. It is necessary to control the operating point to draw the maximum power of the PV cell in order to increase system efficiency. In this paper, two-level single phase PV grid-connected system is designed, which mainly includes PV cell, BOOST circuit, inverter, filter and the...
This paper presents a efficient stand-alone battery photovoltaic (PV) lighting system which can provide functional illumination based on power light-emitting diodes (PLEDs). PLED with specific features of small size, long life and high-brightness light will be choices of future light sources. The PLEDs are feed using a lead acid battery that is charged with a PV panel. This paper presents an interface...
In this paper, a prototype fuzzy logic based maximum power point tracking (MPPT) controller for photovoltaic (PV) systems is presented. The prototype is a boost converter controlled by dSpace® using DS 1104 boar to control current will be extracted from PV. The current is related to maximum power at the moment. That is the implementation MPPT. This paper show comparison result MPPT using FLC and conventional...
This paper presents a Matlab/simulink model of grid-connected photovoltaic (PV) system, including a PV array, a control system, a distribution network and a load. Based on the accurate modeling system, optimum control and stability analysis are studied. The current control strategy can regulate the current at the point of common coupling to achieve the power factor control. The voltage control strategy...
Negative effects in a two-section-module PV system due to shadowing are minimized by using active voltage sharing of section voltages. Instead of conventional bypass diodes, a bidirectional buck-boost-type circuit with current control guarantees equal section voltages yielding a unique maximum power point for the global system. Connecting an external maximum point power tracking (MPPT) converter results...
This paper focuses on alternatives for implementing variable size perturbations in peak current controlled perturbation and observation (P&O) maximum power point trackers (MPPT). Implementations of P&O algorithms based on peak current control and on instantaneous sampled values have shown to provide very fast transients and small oscillations around the maximum power point (MPP). However,...
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