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Recently, introduction of renewable energy such as photovoltaics and wind energy has gained precedence for greenhouse gas reduction and oil substitution. However, due to the power fluctuation of renewable energy sources, voltage and frequency deviation are problematic in power systems. At present, a transformerless battery energy storage system based on a cascaded multilevel converter has been proposed...
In this paper, a photovoltaic (PV) system with energy storage elements (ESEs) is built in Real Time Digital Power System Simulator (RTDS) which is the partial work of future hardware-in-the-loop study of high-penetration multiple PV systems. Cascaded-multilevel inverter is applied as the power electronics interface among the PV array, batteries and grid. The H-bridges are modeled in RTDS small time-step...
This paper proposes a hybrid exciter for the standalone wind turbine driven induction generator. It consists of one set of fixed capacitor bank and a voltage source inverter connected in parallel at the stator terminals of the generator. The inverter provides the necessary variable component of lagging reactive power to the induction generator so that nominal output voltage is obtained even at lower...
The paper proposes a single-phase full-bridge positive/negative pulse charger with energy regeneration and adjustable power factor. Based on a generalized zero vector technique, a novel charging system which combines a single-phase boost rectifier with a buck converter is presented. The system forms a novel single-stage converter of AC to DC, and such a converter has both energy regeneration and power...
In this paper, we propose a grid-connected photovoltaic power system including batteries in order to provide prescribed reactive and real powers to the grid. According to the stochastic nature of the photovoltaic power, the main feature of the proposed system is to erase power fluctuations by designing a dedicated local control system. With batteries, the whole system is able to smooth the PV power...
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