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Isolated grid-connected inverters are typically constructed of two stages, namely a voltage-source inverter stage and an isolated bidirectional dc-dc converter stage. Recently, two dual-bridge isolated series resonant dc-dc converters are used to synthesize segments of the line current and reconstruct the complete sinusoidal line currents using a three-phase unfolder. The unfolder technique synthesizes...
Direct model predictive control (MPDxC) appears to be a strong candidate for high-power applications, because it can achieve very low switching frequencies and keep variables of concern, such as power, current, torque and flux, within specified bounds. The width of bounds is observed to regulate THD of a current when MPDxC is used for controlling the current. This paper describes mathematically the...
Within the context of microgrids, the need for a smart energy management system (EMS) has become increasingly important for users to maximise use of local energy generation and/or trade power effectively with the energy market if there is a grid connection. Many researchers have been developing algorithms to forecast the availability of renewable energy and load demands whilst optimising the energy...
Constant current distribution systems such as under-sea power distribution systems use power converters with a constant input current as a source of input power. This paper analyzes minimum requirements for passive zero-voltage-switching (ZVS) components of dc-dc series resonant converters (SRCs) in dc distribution systems. A steady state analysis of the technique shows that the input voltage varies...
This paper investigates feasibility of a current source converter (CSC) for battery energy storage applications. An inherent feature of the converter is boosting of the DC-link voltage. We discuss the converter operation principle and choice of circuit parameters with effects on system performance. A model that includes switching harmonics is derived to predict accurate behavior of various voltages...
An increasing awareness of energy efficiency has led to the development of several improved converter topologies, semiconductor devices and control schemes for distributed energy resources, and, particularly, for microgrids. Recent advances in energy management systems (EMS) for microgrids have improved upon existing methods in several aspects, including prediction of power generated by photovoltaics...
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