Control and Modulation Techniques for a Centralized PV Generation System Grid Connected via an Interleaved Inverter

Abstract

Abstract:In the context of grid connected photovoitaic (PV) generation systems, there are two paramount aspects regarding the Maximum Power Point Tracking (MPPT) of the photovoltaic units and the continuity of the service. The most diffused MPPT algorithms are based on either perturb and observe, or on an incremental conductance approach and need both PV current and voltage measurements. Several topology reconfigurable converters are also associated with the PV plants, guaranteeing fault-tolerant features. The generation continuity can also be assured by interleaved inverters, which keep the system operating at reduced maximum power in case of failure. In this paper, an evolution of a hysteresis based MPPT algorithm is presented, based on the measurement of only one voltage, together with a novel space vector modulation suitable for a two-channel three-phase grid connected interleaved inverter. The proposed MMPT algorithm and modulation technique are tested by means of several numerical analyses on a PV generation system of about 200 kW maximum power. The results testify the validity of the proposed strategies, showing good performance, even during a fault occurrence and in the presence of deep shading conditions.

A New Synchronization Technique of a Three-Phase Grid Tied Inverter for Photovoltaic Applications

“…The Phase Lock Loop (PLL) is a control system designed to generate the reference output signals related to the input signals for each phase. There are different types of PLL methods in the world of electronic and communication system [1][2][3][4][5][6][7][16][17][18][19][20][21][22][23][24][25][26]. These PLL control systems are designed according to variable frequency and signal phase detector in feedback signals loop, PLL filtering technique, and PLL prefiltering technique.…”

Special Issue on Advancing Grid-Connected Renewable Generation Systems

“…The second paper, authored by G. Brando, A. Dannier, A. Del Pizzo, and I. Spina, discusses the control and modulation techniques for a centralized PV system using interleaved inverters [7]. The third paper, authored by P. Guerriero, M. Coppola, F. Di Napoli, G. Brando, A. Dannier, D. Iannuzzi, and S. Daliento, presents the design of a three-phase grid-connected PV cascaded H-bridge inverter [8].…”

A Control Strategy for a Three-Phase Grid Connected PV System under Grid Faults

“…The generation of photovoltaic renewable energy is the most attractive because of its high availability, the simplicity of the topology, and low cost compared to other resources of renewable energy. As a result, the number of grid-connected photovoltaic (PV) systems is increasing significantly, and studies to ameliorate their reliability and performance are progressing [1][2][3][4][5][6]. However, the high penetration level of distributed generation systems can have a negative influence on the global reliability and stability of the grid, especially under grid fault conditions such as voltage sags and with the use of more and more high-tech devices with good performance and high effectiveness but also with more sensitivity to their electric supply sources [7].…”