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In this paper, a wind energy conversion system interfaced to the grid using a dual inverter is proposed. One of the two inverters in the dual inverter is connected to the rectified output of the wind generator while the other is directly connected to a battery energy storage system (BESS). This approach eliminates the need for an additional dc-dc converter and thus reduces power losses, cost, and...
This paper presents a new control strategy for a high performance hybrid cascaded H-Bridge HB multilevel converter with integrated series Active Power Filter Stage APFS. Unequal DC voltage sources are used to energise the converter's HBs. This offers increased number of voltage levels using fewer number of series connected HBs. Simple hybrid stair-case/SVM modulation strategy is proposed to synthesise...
This paper presents a concept of high frequency link for offshore wind applications based on a reduced matrix converter oriented to reduce the size and volume of the elements in the nacelle. A modular approach aimed at increasing reliability of the conversion system, which can be used in series or parallel connection of the off shore grid is also presented. Features of the proposed conversion concept...
Renewable energy sources such as Photovoltaics (PVs) and Fuel Cells (FCs) generate DC voltage/current and have a high internal resistance/nonlinear V/I dependence, which is why a digitally controlled power electronic interface is always needed to facilitate connection to an AC grid and maximum power extraction. This paper evaluates four single-stage power electronic converters for PVs: the traditional...
In this paper a control method for cascaded H-bridge multilevel converters for grid connection of photovoltaic systems is analyzed. The use of the multilevel converter introduces a series of advantages: improved power quality (lower current ripple), smaller filters, reduced switching frequency, no need of boost dc-dc stage and possible elimination of step-up transformer, all of which have a positive...
This paper proposes a new extended boost quasi Z-source inverter (ZSI) and a simple modulation and control method based on one-cycle control for controlling a grid connected PEM fuel cell energy system. ZSIs are gaining popularity. Similarly one-cycle controllers are becoming popular due to their simplicity, ease of implementation and fast response. However, this control method has not been developed...
In order to supply power from a photovoltaic array or a fuel cell stack at a low dc voltage to a grid at a high ac voltage, a power conditioning unit capable of both voltage-boosting and inversion is required. Newly introduced Z-Source inverter is capable of achieving both these objectives by a single converter stage. This paper describes how a single-phase Z-Source inverter can be built for grid-connection...
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