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A proposal for a two-stage bidirectional electric drive for hybrid electric vehicle is presented in this paper. The system comprises a synchronous PM electrical machine (EM) directly connected to a Diesel internal combustion engine. The EM is fed by a three-level active neutral point clamped (ANPC) inverter connected to a bi-directional multi-phase interleaved DC/DC converter interfacing the high...
This paper presents the small-signal modeling and controller design of an isolated Quasi-Switched-Capacitor (QSC) dc/dc converter. The converter serves as an auxiliary power supply in automotive applications, connecting the highvoltage battery and the 14 V power net. It employs a front-stage QSC dc/ac circuit with a 3:1 voltage step-down ratio, and a poststage synchronous-rectifier, current-doubler...
A novel phase shift controlled modular DC/DC converter is proposed in this paper by integrating the full-bridge converters and three-level flying-capacitor circuit. Due to the series connection of the full-bridge modules, the high switch voltage stress in the primary side is effectively reduced. Therefore, the low-voltage rated power devices can be employed to obtain the benefits of low conduction...
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...
The input current of single-phase inverter typically has an AC ripple component at twice the output frequency. The low-frequency current ripple can cause a reduction in both the operating lifetime of its DC source and the energy conversion efficiency of the system. In this paper1, a proposed waveform control method which can eliminate such a ripple current in boost inverter system, is discussed. The...
This paper introduces a single phase AC/DC converter with unity power factor input at grid side. The proposed topology consists of a diode bridge followed by an asymmetrical DAB circuit working in boost mode. The DAB is utilized to regulate both DC output voltage and averaged input current. With single-side PWM modulation, the DAB can possess advantages such as lower RMS currents and larger soft switching...
In previous work, a novel design of a 2.5kW 400V-12V 93.2%-efficiency DC/DC converter with a triggering angle tracking synchronous rectifier was proposed for use in an electric vehicle to replace the electric alternator. This paper is focused on the further enhancement of the DC/DC converter to improve the system efficiency and wide-range input/output performance.
A modular approach for DC/DC converters to obtain desired voltages and currents is presented in this paper. A high efficiency low switch count isolated push-pull DC/DC converter is used as a unit module. The converters are connected in input series or parallel and output series, or parallel configuration to meet the desired power level. The aim is to obtain a flexible DC/DC converter block which can...
A new shoot-through pulse width modulation (PWM) technique for voltage fed quasi-Z-source DC/DC converters is presented. One advantage of the technique is it minimizes switching losses in the converter by minimizing the number of switching commutations of the active devices in the intermediate H-bridge. The duration of the active and shoot-through states are independently controllable, allowing the...
This work presents the analysis of the behavior of a modular system of DC/DC converters with input-series output-series connections. The goal is to explore a simple solution that provides a stable operation by connecting totally independent converters working in DCM, except one of them (working in CCM) that determines the input-output voltage ratio. This alternative can be applicable when the input...
A single-phase Dual Active Half Bridge (DAHB) DC-DC converter topology is evaluated for medium voltage (MV) application. A 15kV SiC-IGBT based three-level half-bridge is connected to the high voltage (HV) primary side of a high frequency (HF) transformer operating at 10kHz link-frequency. A 1200V SiC-MOSFET based two-level H-bridge is connected on the low voltage (LV) secondary side. This topology...
It is well known that single-phase ac/dc converter requires big output capacitor to filter the input ripple power from the grid. To interface a dc nanogrid to a single-phase utility, bidirectional power flow and small dc side output voltage ripple are also necessary. By cascading a full-bridge ac/dc converter with a bidirectional buck converter, a two-stage ac/dc topology is adopted to reduce the...
The method of using output-current-feedforward (OCFF) control to realize zero output impedance is widely applied in Buck converter. However, it is found that the converter may have stability problems with this method. The OCFF controller's transfer functions of basic DC/DC converters are calculated when different current (inductor current, load current) feedforward control is used in this paper There...
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 an output current ripple reduction algorithm using model-based predictive control (MPC) for an energy storage system (ESS). In single-phase systems, the DC/AC inverter has a second-order harmonic at twice the grid frequency of a DC-link voltage caused by pulsation of the DC-link voltage. The output current of a DC/DC converter has a ripple component because of the ripple of the...
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,...
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