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DC Microgrids have recently received a lot of attention in the last years due to high penetration of renewable energy sources as well as distributed energy storage systems. In the future DC microgrids could be preferable respect to AC microgrids in terms of redundancy since multi-DC-Bus solutions could provide a continuative power supply to the loads. An overview of Multi-DC-Bus solutions is presented...
High power converters adopted in oil and gas applications or in wind turbine applications can benefit from the introduction of medium voltage multilevel inverters, in terms of volume and efficiency. The low switching frequency lead to currents characterized by an high harmonic content despite the use of multilevel technology, hence to high filtering needs. The use of LCL-filter is the solution to...
Typically the resonance problems related to the use of LCL-filters in grid connected inverters are analyzed assuming the operation of a single inverter. Wind and photovoltaic parks may experience propagation of resonance from a poorly damped inverter to other systems connected in parallel. The paper focuses on the study of the resonance at a park system level with simulations and experimental results.
Grid-connected converters usually employ an LCL-filter to reduce PWM harmonics. To avoid the well-known stability problems it is requested to use either passive or active damping methods. Active damping methods avoid losses and preserve the filter effectiveness but they are more sensitive to parameters variation. In this paper the robustness of active damping methods is investigated considering those...
Universal operation of small-power wind turbine systems (grid-connected and island mode) may increase their penetration in the power systems. This paper proposes the use of gain scheduling to adapt the droop control gains to the different operation modes. It allows to achieve fast dynamic response in grid-connected mode and small voltage and frequency variations in island mode. An energy storage system...
In this paper it is investigated the use of fractional-order controllers for an universal operation of small-power wind turbine system. Universal inverters should be able to work both connected to the grid both in island mode. Proper active/reactive control strategies are needed to get system work in universal operation. The aim of this paper is to investigate the use of fractional PI (PIα) for active...
Distributed power generation systems (DPGS) are based on the grid-converters as interface between the source and the grid. They require a control strategy is designed in order to guarantee system stability and reliability. The effect of converter outages should be properly studied as well as the effect of power quality disturbances. The aim of this paper is to provide a comprehensive analysis of these...
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