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Conventional dual buck and boost inverter with a single input dc source (DBBI-SIDS) has the satisfactory performance of high efficiency, low total capacitance, and no leakage current. Nevertheless, the main current will flow through the two individual capacitors of the inverter, which may reduce their lifetimes. In this article, a new DBBI-SIDS will be proposed, where two extra mosfet switches at line frequency are adopted to be instead of the two individual capacitors of the conventional DBBI-SIDS. Different from the conventional DBBI-SIDS, the new inverter works in the pure full bridge mode. The detailed principle of operation is presented through equivalent circuits. The static characteristics and the control strategy of the proposed inverter will be also introduced in detail. A 110-V/50-Hz/550-W prototype has been developed in the laboratory, where experimental results have verified the desired performance of the proposed inverter.

In this paper, an open-circuit fault diagnosis and fault-tolerant control method of SiC-MOSFET for the coupled-inductor-based Aalborg inverter is proposed. The method detects open-circuit faults by calculating the slope of the sampling current, and identifies the faulty SiC-MOSFET devices through a reconfiguration control algorithm. In any operating mode of the coupled-inductor-based Aalborg inverter, when the high-frequency switch tube has an open-circuit fault, the inverter can be reconfigured as a Fly-Back-type or Fly-Boost-type converter to continue operating. The proposed method enhances the reliability of the inverter and does not require additional sensors or diagnostic circuits, thus not increasing the cost of the overall system.

Purpose The combination of desalination technology with renewable energy sources (RES) provides a sustainable approach for increasing potable water availability without imposing negative environmental effects. This paper aims to present the development of a platform, which is an internet-based tool integrating the design optimization of desalination systems with spatial modeling based on a geographic information system (GIS). Design/methodology/approach The proposed platform assists decision-makers to select the optimal location and configuration of both the energy- and water-related subsystems of desalination plants that are power-supplied by RES, such that the lifetime cost of the overall desalination plant is minimized. It enables to optimize the desalination plant site selection and sizing with various hybrid power supply (solar, wind, wave and electrical grid power systems) and desalination technologies combinations, while simultaneously exploiting spatial technologies in an internet-based GIS platform. Findings A pilot study for the optimal design of stand-alone and grid-connected desalination plants powered by RES is presented, which demonstrates the functionality and features of the proposed platform. It is also shown that a grid-connected desalination plant designed by the proposed software design tool exhibits significantly lower lifetime installation and maintenance costs compared to its stand-alone counterpart. Originality/value The proposed platform combines technological, scientific and industrial knowledge with information about societal/political conditions and geo-spatial technologies in a user-friendly graphical interface. Therefore, it provides a design tool enabling its users to secure water supply in a sustainable and economically viable manner.

Summarization: Nowadays, renewable energy sources (RES) in combination with power systems having the capability of storing electric energy are increasingly used in distributed generation applications. Multiport DC/AC inverters are required for the integration of RESs and energy storage systems with the electric grid and local loads. Recently, a variety of multiport DC/AC inverter topologies have been reported in the literature. In this paper, a comparative study of various alternative non-isolated DC/AC three-port converter (TPC) topologies is performed, when they are used as the power electronic interface between photovoltaic arrays, battery energy storage units and the electric grid/load. This study focuses on the performance of these topologies in terms of the leakage ground current and the battery ripple current during charging and discharging in distributed generation systems. A comparative performance evaluation of the alternative multiport DC/AC inverter topologies has been performed in Matlab/Simulink for the case of a 2 kW distributed energy system and the simulation results are presented. Παρουσιάστηκε στο: 2021 10th International Conference on Modern Circuits and Systems Technologies

Summarization: This paper focuses on the design of a low-voltage power converter for an on-chip PV cell-level inverter. Various topologies are discussed for the DC/DC stage, whereas the ZVS quasi-resonant boost and the synchronous boost are considered the most appropriate for this application. Both the aforementioned topologies are modeled and evaluated in terms of efficiency, by the aid of PSpice simulations. Due to requirements and limitations of the available 0.18 μm CMOS process technology, the synchronous boost is finally chosen as the most appropriate solution. As for the DC/AC stage, the H-bridge inverter configuration is selected, as a simple, compact and cost-effective solution. A prototype converter is designed and constructed with discrete components, so as to validate the functionality and performance of the proposed system. Finally, experimental results are presented, indicating the high efficiency that can be achieved. Παρουσιάστηκε στο: 2021 10th International Conference on Modern Circuits and Systems Technologies