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In this paper, a new method to balance the DC bus capacitor voltages of two-stage AC-DC-AC converters with split-capacitor inverters is proposed. Converters use such split-capacitor inverters for various reasons such as cost, improved harmonic content and lower switch voltage stresses than those of conventional two-level, six-switch inverters, but the effectiveness of such inverters is limited by...
In this paper, a current-fed asymmetric full-bridge LLCC resonant converter is proposed for the dielectric barrier discharge (DBD) applied to the surface treatment. Compared with a previous design, the asymmetric structure with no front-end buck circuit and only two reverse-voltage blocking diodes is adopted to reduce the component count and circuit complexity. Moreover, the phase-shift control of...
This paper presents a distributed battery energy storage architecture where the cells in the battery pack are decoupled from each other by connecting each cell with a lower power (smaller) DC-DC power converter. In addition to providing voltage regulation for the DC bus, these small DC-DC power converters are utilized to achieve state of charge (SOC) balancing among the cells by employing a proposed...
This paper presents a compact bi-directional solidstate transformer (SST) based on a current-source topology, featuring high-frequency galvanic isolation and only two minimal power conversion stages. The topology, referenced as Dynamic Current or Dyna-C, can be configured for multiterminal DC and/or multi-phase AC applications. The Dyna-C is robust, can be stacked for MV applications, and be paralleled...
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 proposes a new ZVS technique for full-bridge single-phase inverters that has several applications such as PV ac modules. The technique uses smaller passive filter between inverter and grid which results in a simple control, simpler design and a more compact and more efficient topology. The proposed topology uses a passive LC small auxiliary circuit which operates under fixed frequency and...
The State of California has adopted tough new energy efficiency standards for battery charger systems. These regulations promise to save cost, energy, and greenhouse gas emissions, but they also present new challenges to engineers and managers involved in the planning, design, and system integration of battery charger systems. This paper aims to provide guidance by explaining the requirements of the...
This paper introduces a unified modeling methodology to describe and explore the loss mechanism of resonant Switched Capacitor Converter (SCC) operating in a self-commutation zero current switching. The conventional equivalent resistance concept, which assumes a single conduction path of the resonant current, is generalized to model the losses in cases where the resonant current is divided across...
A mathematical method is proposed for optimal scheduling lead-acid batteries for cycling use in this work. Typical battery characteristic curves and experiential data, including the discharge rate vs. discharge time, discharge depth vs. cycling times, are first converted into mathematical expressions with consideration of the circumstance temperature. And then through the proposed optimization algorithm...
Novel individual power extraction topologies through partial current processing (PCP) technique are proposed for series connected photovoltaic panels. In the presented PCP technique only the mismatch currents between the series connected panels are processed. Both of the proposed current fed and voltages fed topologies process the mismatch currents without the need for an isolation transformer. These...
This paper proposes a new distributed battery energy architecture based on the micro-bank modules for DC microgrids. The benefits of the proposed architecture include 1) no voltage sharing problem and no overcharge/overdischarge problem; 2) high compatibility and reliability 3) high energy utilization efficiency; 4) reduced volume and weight of the BMS. Taking advantage of the battery recovery effect,...
This paper introduces a distributed battery equalization structure for battery strings in which power electronic converters are integrated on battery cells. Because each cell is managed individually, the proposed structure has many advantages over traditional ones. Design issues about power converters are discussed. A two-level control algorithm is proposed to perform global and local functions including...
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