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An important trend in photovoltaic lines of research is the use of plug and play microinverters attached to the panel, allowing the so called AC module. However, these converters are subjected to high temperature and humidity. In order to improve reliability and achieve long lifetime, this work proposes a new topology, which provides inductive power decoupling and eliminates electrolytic and even...
This paper presents a novel “Modular Multilevel Converter” (MMC) topology. The topology takes advantage of the MMC characteristics by offering multilevel output voltage with low Total Harmonic Distortion (THD), increased reliability, and design flexibility due to the modular nature of the converter [1] and [2]. This topology is composed of a “full-bridge converter” (FBC) connected to multiple “High...
Power plants employing renewable energy sources connected to large power systems continue increasing their number and size. PV and wind farms are a clear example of this trend. They employ power electronics in order to inject power in the grid and in most cases the interaction does not take into account the power system needs. However, as their size increases, these plants should support the grid...
This paper considers the control of a 7-leg back-to-back Voltage Source Inverter (VSI) arrangement feeding a 4-wire load from a 3-phase Permanent Magnet Synchronous Generator (PMSG) operating at variable speed. The 7-leg converter is regulated using Resonant Controllers (RCs) at the load side and self-tuning resonant controllers at the generator side. The control system is augmented by a feed-forward...
This paper discusses the Brazilian photovoltaic grid-connected inverters standard comparatively with their European and North American counterparts. The electrical characteristics between the photovoltaic grid-connected inverter system and the electrical distribution network, required by the ABNT NBR 16149 standard, are described in detail. A comparison with its related standards in Europe (IEC Std...
This paper presents the concept and experimental results of a microgrid under the name of District Power Plant, designed to operate as an active element in the utility grid, capable of provide services such as demand response, active power supply and advanced metering. It will show the stable operation of this kind of system under islanding and reconnection operations, as well as show the good energy...
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