Level Doubling Network and Ripple Correlation Control MPPT Algorithm for Grid-Connected Photovoltaic Systems

This book describes an original improvement in power quality of photovoltaic generation systems obtained by the use of a multilevel inverter implemented with level doubling network (LDN). Modulation principles and harmonic analysis of output voltages are proposed and introduced in detail for both single and three-phase LDN configurations. The analysis is then extended to dc-link current and voltage, with emphasis to low-frequency harmonics and switching frequency ripple. This work represents the first comprehensive implementation of maximum power point tracking (MPPT) schemes using the ripple correlation control (RCC) algorithm in the presence of multiple ripple harmonics, such as in the case of multilevel inverters. Numerical simulations and experimental tests are carefully reported here, together with practical insights into the design of dc-link capacitors.

Nominated as an outstanding PhD thesis by The University of Bologna, Italy Reports on an improved multilevel inverter based on Level Doubling Network (LDN) Presents an original implementation of the maximum power point tracking (MPPT) schemes Offers important insights into the stability and the dynamic performance of the ripple correlation control (RCC) MPPT algorithms

Inhalt
General introduction.- Basic RCC-MPPT scheme in single-phase H-bridge grid-connected PV systems.- Improvement of output power quality by Level Doubling Network (LDN).- Analysis of dc-link current and voltage ripple: single-phase configuration.- Analysis of dc-link current and voltage ripple: three-phase configuration.- Conclusion and perspectives.