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This work targets modular nanogrids for remote locations, where photovoltaic modules can be gradually introduced to grow the renewable energy capacity at minimal capital cost, while reducing diesel fuel consumption. Today's grid-tied micro-inverters provide a modular solution for ac power generation in nanogrids but battery storage remains centralized, requiring an additional ac-dc converter. The...
A new bi-directional DC-DC converter is designed and analyzed in this paper. This new topology and its control strategy have completely solved voltage spike issues present in traditional bi-directional DC-DC converters which also have limited power capability and efficiency. This converter can serve as battery bank and DC-bus interface and work in both directions (charging-battery direction and supporting-bus...
In this paper, parallel control method of two 2.5kW three-phase bi-directional isolated interleaved dc-dc converters for the battery test system is discussed. The battery test system consists of battery modules, two three-phase bi-directional isolated interleaved dc-dc converters and three-phase inverter. In discharge mode, energy from battery is delivered to grid and energy is delivered to battery...
This paper presents an optimal negative current control for four-phase interleaved bi-directional converters to achieve soft-switching features. Four-phase buck/boost converters with bi-directional operation and in discontinuous conduction mode (DCM) are designed and implemented. The optimal negative current is determined and controlled to reduce reactive power loss, while achieves ZVS and ZCS turn-on...
This paper proposes a novel control scheme for a stand-alone PV application. A two power stage approach has been used that consists of a front end high gain DC-DC converter followed by a 3φ H-bridge inverter. A general reactive load has been considered. The control scheme uses abc to dq reference frame transformation. The active power demand is controlled by regulating the dc link voltage. Reactive...
In this paper, a new hybrid energy storage system (HESS) with batteries and ultracapacitors (UCs) is proposed. The proposed topology adopts a smaller power capacity bi-directional dc-dc converter compared with the traditional HESS by adding two switches and diodes. The cost, volume and weight of the whole system can be reduced while the power demand of DC bus is satisfied. Three working modes of the...
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