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This paper introduces a novel battery cell balancing technique for portable applications, where multiple series connected lithium-ion battery cells are utilized. The equal discharge of the battery cells are achieved through a simple modification of a hybrid step-down dc-dc converter, where only an additional resonant inductor is required. Hybrid converters, combining switched-capacitor and inductor...
This paper presents new gating techniques to improve the efficiency of full-bridge DC-DC converter for battery charging in electric vehicles. The converter is assisted by a passive auxiliary circuit to extend the soft-switching range. The uncontrolled auxiliary circuit current increases the conduction losses of the converter when gated with conventional phase-shift modulation (PSM) technique. The...
A current-source inverter-based standalone wind energy conversion system has been recently proposed for low power applications. In this paper, the system is modified by removing the dump load and avoiding the surplus power generation by curtailment of wind power. The generator-side converter is used to control the shaft speed, allowing extraction of maximum available wind power in normal mode of operation,...
This paper proposes a new isolated, multiport, bidirectional DC-DC converter with the least number of switches for photovoltaic (PV)-battery-DC microgrid applications. The proposed converter is able to perform the maximum power point tracking (MPPT) control for the PV system when solar energy is available as well as control the charge and discharge of the battery with the PV system and the DC microgrid...
This paper presents modeling, design and analysis of a bidirectional half-bridge DC/DC converter suitable for power electronic interface between the main energy storage system and the electric traction drive in hybrid electric vehicles. A hybrid energy storage system composed of a battery unit and an ultracapacitor pack is considered. A parallel dc-linked multi-input converter with a half-bridge bidirectional...
A high efficiency converter topology for extracting maximum power from a photovoltaic (PV) module to charge standalone storage devices is presented in this paper. A reversed buck-boost converter enabling parallel power processing with a power switch referenced to the common return is the main core of the charging system. Small signal analysis of the proposed charging system is carried out to facilitate...
Although the Series Resonant Converter (SRC) is not yet fully explored and widely applied it is becoming more and more important for the contactless charging of the Electric Vehicles (EV) batteries. From the point of view of the modern propulsion batteries the careful and reliable charging is very important and good solutions will be the SRC contactless battery charging and the online resonant energy...
The DC bus voltage of grid-connected two-stage power converter system (PCS) is always vulnerable to abrupt change of output power. To solve this problem, the mathematical models of the converter and its control system is established firstly. The control parameters designing via classical control theory is followed. This is continued with analyzing the cause of the voltage fluctuations. Theoretical...
Several topologies have been proposed for combining batteries and ultracapacitors (UC) to build a hybrid energy storage system (HESS). It is essential to quantify the performance benefits of these different circuit topologies. This will establish a metric for evaluating the performance of new topologies as well as providing the basis to select a certain topology and design a HESS optimized for the...
This paper focuses on comparing the effects of varying degrees of electromechanical coupling in piezoelectric power harvesting systems on the dynamics of charging a storage capacitor. In order to gain an understanding of the behavior of these dynamics, a transducer whose vibrational dynamics are impacted very little by electrical energy extraction is compared to a transducer that displays strong electromechanical...
This paper presents a bidirectional 3X dc-dc multiplier/divider that can interface the battery with the inverter dc bus for hybrid electric vehicle (HEV) traction drives. Compared with traditional multi-level dc-dc converter, this converter can have three output/input voltage ratios with smooth transition. The control method to limit the transient inrush current, as well as a novel regenerative clamping...
Ultra-capacitor has the features of high power density, quick charge and long life cycle, which receives great attention in the research and development of electric vehicles. State of charge of battery or ultra-capacitor is the most important parameter in an electric vehicle. In this paper, a state-space state of charge estimation method for ultra-capacitor made of active carbon electrode and aqueous...
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