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This paper presents dynamic analysis of a Modular Multi-Parallel Rectifier (MMR) based on state-space modelling. The proposed topology is suitable for high power motor drive or multi-parallel AC-DC applications, which can reduce line current harmonics emissions significantly. However, a proper controller is required to share and control current through each rectifier. Mathematical analysis and simulations...
One main advantage of three-phase LLC converters for high power applications is their full-load efficiency. However, issues with light load operation (i.e. low efficiency) requires investigation. In this paper, a new modulation strategy is proposed to improve the light load efficiency of three-phase LLC converters to achieve a better efficiency curve. The proposed strategy uses two different modulation...
A soft-switching solution implemented to the traditional bidirectional DC/DC converter is developed. The soft-switching cell, which composed of three auxiliary switches, one resonant capacitor and one resonant inductor, is equipped in the traditional bidirectional DC/DC converter to realize circuit ZCT or ZVT operations in both energy transmission directions. Two driving methods are presented to charging...
In this paper, a new quasi Z-source inverter based on new capacitor basic units (CAQZSI) is proposed. It is possible to develop the proposed topology by using n numbers of the basic units that is one of the main advantages of the proposed CAQZSI. The boost factor equation, voltage and current equations of the capacitors, diodes and inductors are obtained for the proposed topology and developed CAQZSI...
This paper investigates the operation principle, modeling, and control of a hexagonal converter for grid connected photovoltaic (PV) systems. The hexagonal converter is composed of six conventional two-level voltage source converters (VSCs) in which each VSC module are connected to a string of PV modules. The equivalent circuit model of the proposed topology is first detailed in the abc reference...
A quasi single-stage power factor correction converter, which is composed of a three-level (TL) Boost converter and a DC-DC transformer (DCX), is presented and analyzed in this paper. The DC output load is connected to one of the dividing capacitors of the TL Boost converter, so that the load voltage can be lower than the peak amplitude of the AC line voltage and part of the AC input power can be...
A novel topology is proposed that interfaces between one or multiple DC sources and a three-phase machine. The DC-side converter consists of two half-bridges that form a specialized converter. The half-bridges operate at a reduced voltage which reduces inductor effort and switching losses. The resulting four DC-link levels power two three-phase bridges that can drive open-winding machines. The circuit...
The paper presents a dual output AC-DC converter as a suitable candidate in emerging DC distribution systems. In accordance with the need of vast range of DC loads and standard distribution levels, the proposed Dual Output PFC Rectifier has been designed to provide simultaneous boost and buck outputs. In addition, the design ensures that the rectifier operates at unity power factor while maintaining...
A novel on-board battery charger for electric vehicle (EV) application based on open-winding permanent magnet synchronous machine is presented in this paper. The innovative charger reutilizes the currently existing components of EV drivetrain system, which has the net effect of saving cost, volume and weight. The topology integrates the conventional common dc-link converter with the windings of the...
This paper proposes a Current Deadbeat Control (DBC) algorithm for a three-phase 9-cells qZS based Cascaded H-Bridge (CHB) inverter to ensure grid current supply with low THD. The studied topology is considered as a single-stage DC/AC topology having the capability of boosting the DC input voltage with high-quality multilevel AC voltage, independent DC-link voltage compensation, and control of the...
This paper presents a complete design procedure for a motor drive aiming at maximizing nominal power within loss (30 W) and form factor (60 inch3) constraints. Particularly, this motor drive system has EMI requirement on both input and output sides and it should be free convection cooled. Loss-size Pareto fronts of multiple three-phase topologies including two-level voltage source converter (VSC),...
In this paper, a switched Z-source dc-dc converter (SZSC) is proposed for the conversion from a low voltage to a higher one in renewable energy systems. The voltage gain is increased by adding another one switch and diode to the output terminal of the traditional Z-source dc-dc converter. Not only does the output capacitor function as the filter capacitor; it is also connected in series into the inductors'...
This paper proposes a digitally controlled bipolar converter for dc micro grids. The bipolar converter configuration is based on the combination of SEPIC and CUK converter with the modifications in both the converters. In the proposed bipolar converter, the equivalent series resistance (ESR) of the transfer floating capacitor is increased by inserting a series resistance in the both SEPIC and CUK...
This paper proposed a novel isolated bidirectional flyback converter integrated with two non-dissipative LC snubbers. In the proposed topology, the main flyback transformer and the LC snubbers are crossed-coupled to reduce current circulation and recycle the leakage energy. The proposed isolated bidirectional flyback converter can step-up the voltage of the battery (Vbat = 12V) to a high voltage side...
Solar photovoltaic based microgrids and nanogrids are becoming very popular in many developing countries due to lowering panels and balance of system costs. While many nanogrids (isolated houses with solar generation or small integrated community with very low power provisioning) have been popular, the need for interconnecting these for bidirectional power transactions is growing. This allows efficient...
Low voltage high power wind energy conversion system (WECS) requires heavy cables and large step-up grid interfacing transformers. In recent years, power and voltage rating of offshore wind turbines have already reached 10MW and 10kV respectively, and medium voltage converters have become strongly demanded. Some scholars proposed a cascaded multilevel converter based on dual active bridge (DAB) to...
Multi-level topologies reduce the requirements on inductors and filters, however, given the high number of series connected semiconductors, it is still unclear if they are a suitable option to achieve ultra-high efficiency while maintaining a reasonable power density. For this purpose, an extensive quantitative evaluation of different topologies is carried out, to determine the required volume for...
The paper proposes a new step-up topology with high step-up conversion ratio. Dc analysis is performed and the static characteristics are derived revealing that the static conversion ratio exhibits a high voltage boost, the converter still operating at reasonable duty cycles. Compared to a classical Boost, the static conversion ratio at the same duty cycle D is (1+nD) time higher, where n is the transformer...
Uninterruptible Power Supplies (UPS) have several closed loop control topologies for control of Voltage Source Inverter (VSI). The topologies vary mainly due to choice of control/feedback variable. This paper attempts to categorize different control topologies and highlights the similarities/differences between them. Further, an analytical study on the basis of steady-state and transient performance,...
New members of XY converter family topologies are proposed in this treatise for a high-voltage/low-current renewable application. Based on the X Converter, the whole existing X-Y Converter family is categorized into four categories; L-Y, 2L-Y, 2LC-Y and 2LCm-Y converter. Four new 2LC-Y topologies (2LC-LVD, 2LC-2LVD, 2LC-2LCVD and 2LC-2LCmVD) converters are presented in this treatise which offer an...
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