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This paper proposes a multilevel series compensator (MSC) to deal with: i) voltage sags/swells, ii) harmonic compensation or iii) reactive power compensation. Such a device can be considered as a dynamic voltage restorer (DVR) or a series active power filter (Series-APF). The MSC can improve the power-quality of loads located in stiff systems. The configuration is based on three-phase bridge (TPB)...
Dual-active-bridge (DAB) topology requires a powerful controller to realize voltage conversion and address fast load transients. A controller with nonlinear feedforward and linear feedback loops is able to facilitate a DAB converter to fulfill this requirement. The nonlinear feedforward loop is designed based on the nonlinear model of the DAB converter. The linear feedback loop is realized as a traditional...
This paper proposes a new current-ripple-based control strategy for the Series Ripple Cancellation Converter (Series RCC), which eliminates LED light flicker caused by Power Factor Correction (PFC) stage and significantly reduces its output capacitance. Instead of sensing two differential output voltage signals as in existing voltage-ripple-based control strategy, the proposed current-ripple-based...
Integration of functions and features into silicon circuits is very important for a new power circuit design in order to reduce the electronic bill of material's (eBOM) cost and component count. These eBOM reductions increase the reliability and decrease the cost and size of a product. A low cost power micro-inverter using two application specific integrated circuits, analog power manager (APM) and...
This paper presents an active solution for the elimination of the leakage current, in a three-phase PWM inverter drive. With respect to a traditional three-phase bridge, the proposed solution reduces the common-mode voltage variations, both in amplitude and frequency. A novel architecture for the inverter is presented. Between the DC source and the traditional three-phase bridge, two active DC-decoupling...
In order to develop and validate smart grid technologies with complex control and communication, detailed modeling of distribution systems using the Real Time Digital Simulator (RTDS) is invaluable [1]. At the distribution system level, testing a 13 kV power electronic device without first validating its controls is cost prohibitive. RTDS provides a cost effective way to study smart grids at not only...
This paper presents the development of a single-phase online Uninterruptable Power Supply (UPS) system using a HPF front-end Boost converter with integrated Power Factor Correction (PFC) and DC-DC functions and an ordinary Full-Bridge as the single-phase output inverter. Besides the front-end stage with integrated PFC and DC-DC functions, the main feature of the proposed solution is the use a Proton...
In this contribution the concept of a multi-tap transformer topology for SS-compensated Inductive Power Transfer (IPT) systems is proposed. The objective is an improvement in terms of overall efficiency and maximum tolerable misalignment of the secondary transformer coil that is assumed to be mounted underneath an electric vehicle (EV). In a first step mathematical expressions are derived to describe...
The rapid maturation of GaN power transistors continues to enable new capabilities in high frequency power conversion. In this paper we will evaluate one of the latest technological advancements in eGaN® FETs, monolithic integration. The benefits of monolithic integration for GaN power transistors with regards to parasitic reduction, die size optimization, and thermal performance will be discussed...
A generic, Fourier-based method for the derivation of optimal, full-operating-range zero voltage switching (ZVS) modulation schemes for dual active bridge (DAB) converters is presented. Thereby, the AC-link voltages and currents, and the DAB's input current and power flow, are described using trigonometric Fourier series. Furthermore, the amount of charge that is available in the bridge currents to...
This paper proposes a current source inverter (CSI) with additional Silicon Carbide (SiC) switches and traditional silicon-based inverter bridge. A grid-tied operational principle has been proposed, which can significantly reduce the switching counts and meanwhile realize the zero current switching (ZCS) for the rear-end CSI circuitry. The proposed current source inverter could employ the superior...
This paper presents the application of a Delta-Connected Cascaded H-Bridge Converter in unbalanced load compensation. The compensation includes positive sequence reactive power current and negative sequence current compensation. The controller designed based on the detail power flow analysis which can achieve dc capacitor voltage balancing control by zero sequence current injection even when compensating...
This paper provides an experimental discussion on adjustable-speed electrical drives using a modular multilevel cascade converter based on triple-star bridge cells (MMCC-TSBC) when the motor frequency is passing through, or equal to, the supply frequency. The TSBC converter is one of the most suitable candidates for medium-voltage, high-power motor drives with regenerative braking. However, its capacitor-voltage...
This paper proposes a novel modulation method of the full bridge three-level LLC resonant converter. The voltage gain of the converter is analyzed by First Harmonic Approximation technique using this modulation method. Therefore designers can easily calculate the converter parameters. A 385V input, 225 to 378V/6.6kW output prototype converter shows 98.14% peak efficiency.
This papar proposes which the Dual Active Bridge (DAB) converter changes between Full Bridge (FB) converter's operation and Half Bridge (HB) converter's operation on the secondary side of the high frequency transformer depending on the output power. With the HB converter operation's, the iron loss of the transformer becomes small because the secondary voltage of the transformer becomes half compared...
In this paper, we introduce a step-down resonant dc-dc converter architecture based on the newly-proposed concept of an Impedance Control Network (ICN). The ICN architecture is designed to provide zero-voltage and near-zero-current switching of the power devices, and the proposed approach further uses inverter stacking techniques to reduce the voltages of individual devices. The proposed architecture...
This paper presents an interleaved totem-pole bridgeless power factor correction (PFC) rectifier which consists of a coupled inductor and two interleaved bridge arms. The core utilization and power density are improved with the use of coupled inductor. However, it also introduces a serious diode reverse-recovery problem and increases the turn-on loss obviously due to the poor parasitic body diode...
Nowadays there has been an important increase of electric equipment in modern aircraft which leads to a rising demand of electrical power. This highlights the necessity of efficient, reliable and high energy density power converters which rectify three-phase 115V ac to 270V dc for power distribution. This paper presents an isolated single-stage PWM rectifier with the integration of a current injection...
While interior permanent magnet (IPM) machines have been considered the state-of-the art for traction motors, synchronous reluctance (SynRel) motors with advanced materials can provide a competitive alternative. IPM machines typically utilize Neodymium Iron Boron (NdFeB) permanent magnets, which pose an issue in terms of price, sustainability, demagnetization at higher operating temperatures, and...
For energy conversion systems that require bidirectional energy transfer between two DC sources, the generally preferred converter topology is a Dual Active Bridge (DAB), particularly when galvanic source isolation is required. However, for maximum efficiency the two bridges should operate under Zero-Voltage-Switching (ZVS) conditions, and hence it is important to be able to accurately identify this...
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