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This paper presents a comparison study of AC bus and DC bus topologies for electric vehicle (EV) battery chargers in smart car parks. The two charger systems are compared from two aspects: the features from the user side and the power quality on the grid side. Considering the system reliability, cost, size and conversion stage, the pros and cons of AC and DC buses systems are introduced and summarized...
Flux-switching permanent magnet machines (FSPMMs) have been investigated for hybrid electric vehicles (HEVs). This paper presents an optimal FSPMM with 12 stator poles to meet the minimal performance specifications required by the drive machine in the 2010 Prius HEV. After a qualitative analysis based on size equation to briefly compare performances of FSPMMs with four rotor topology structures, a...
This paper proposes a self-tuning model predictive direct power control (MPDPC) strategy for power flow control and power quality improvement in grid-connected power converters. At each sampling instant, a fuzzy logic controller is used to determine online the best weighting factor values for a given operating point. These values are then used to solve the multi-objective optimal control problem associated...
This paper presents an improved single phase seven-level active rectifier architecture controlled by finite control set model predictive control (FCS-MPC). The FCS-MPC is designed to enable power conversion with a unity power factor and generate seven level voltage waveform at the input. The proposed active rectifier architecture reduces harmonic contents of the rectifier input current by producing...
This paper proposes topology of a magnetically coupled residential micro-grid consisting of a multi-port dc-dc converter and a single phase grid-connected bi-directional inverter. It integrates photovoltaic (PV) and fuel cell energies to supply the residential load via a common high-voltage dc bus linked to a single phase bidirectional inverter. A battery is used to store the surplus energy of the...
This paper is concerned with the process of current commutation and overvoltage protection in matrix converters. The mechanisms involved in the commutation process and clamp circuit are described and simulation waveforms are presented. A four-step semi-soft commutation strategy is described that this technique relies on knowledge of the output current direction and the ability to control the direction...
To solve the issues of the open-loop control accuracy in a proton exchange membrane (PEM) fuel cell power conditioning system (PCS) with active clamp push-pull DC/DC converter for input current ripple reduction, a novel closed-loop digital-controlled method is proposed. The proposed PEM fuel cell PCS consists of a high-efficiency high-step-up current-fed resonant push-pull DC/DC converter and a half-bridge...
Due to the impact of intermittency of renewable energy sources on electricity distribution networks, using energy storage systems (ESS) to stablize the grid are essential. Thus an intelligent system to actively control the distributed generations (DG), ESS and load are of vital significance for better integration of DGs to utility grid. This paper proposes a novel topology of microgrid system with...
This paper presents a new diode free freewheeling and common-mode voltage (CMV) clamping branches for single phase transformerless grid connected photovoltaic (PV) inverter for complete leakage current elimination and low conduction losses. In the past, various isolation techniques have been proposed for leakage current elimination in transformerless PV inverters. However, galvanic isolation only...
Conventional model predictive power control (C-MPPC) requires a large amount of calculations, which is an obstacle for its application, especially in the multilevel converters. To solve this problem, this paper presents an efficient MPPC (E-MPPC) for three-level AC/DC converters by eliminating the complicated power predictions. As a result, the execute time and computational burden are reduced significantly...
This paper provides a brief review on characteristics of main topologies of voltage source multilevel inverters. The selected topologies included conventional two levels, flying capacitor, neutral point clamped, three levels and seven levels cascaded H-bridge inverters. Several performances of topologies including quality of waveforms of output voltage, cost, complexity and reliability are selected...
This paper proposed a 43-level 3-phase 33 kV modular multilevel cascaded (MMC) converter for direct grid integration of renewable generation systems. A high-frequency magnetic-link is considered to generate isolated and balanced multiple dc sources for all of the H-bridge inverters of the MMC converter. The proposed converter is designed and analyzed taking into account the specified system performance,...
Recently, medium (0.1–5 MW) and large (>5 MW) scale photovoltaic (PV) power plants have attracted great attention, where medium-voltage grid connection (typically 6–36 kV) is essential for efficient power transmission and distribution. A power frequency transformer operated at 50 or 60 Hz is generally used to step up the traditional inverter's low output voltage (usually ≤400 V) to the medium-voltage...
The classical approach based on low-voltage converter is commonly employed a low-frequency transformer (inside or outside the nacelle) of wind turbine system. Because of the heave weight and large size of the transformer, the turbine can be expensive and complex for installation and maintenance. As an alternative approach to achieve a compact and light wind turbine a medium-voltage converter using...
Soft magnetic composite (SMC) materials possess a number of unique properties and have undergone a significant development in the past decade. Based on the experiences on SMC materials and SMC electrical machines from our research group and other researchers, this paper reviews the investigation on motor topologies for SMC application. Both successful experiences and existing difficulties are analyzed...
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