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A new class of modular multilevel dc/dc converters has recently emerged that eliminates the traditional full-rated intermediate ac stage inherent to two-stage dc/dc converter structures, that is, two cascaded dc/ac modular multilevel converters (MMCs). This paper introduces the first averaged dynamic state-space model for this new class of single-stage dc/dc converter, called the DC-MMC, which captures...
Depending on the rotor magnet and stator winding configurations, the magnitude of the resulting flux-linkage harmonics in permanent-magnet (PM) motor drives can be substantial. The flux-linkage harmonics result into dc-link current harmonics that can cause the operation of certain track circuits (used to identify the presence of a train on a track section) to malfunction. Predicting the impact of...
The future renewable electric energy delivery and management (FREEDM) system provides a DC interface for alternative energy sources. As a result, photovoltaic (PV) energy can be easily delivered through a DC/DC converter to the FREEDM system's DC bus, without the requirement of an additional DC/AC inverter. For this PV converter, the module integrated converter (MIC) is a good candidate. In this paper,...
Optical burst switching is considered as a conceivable emerging paradigm between optical circuit switching and optical packet switching comprising advantages of both. Using an all-optical data plane that lacks devices to realize random access memories, the common statistical multiplexing is not possible. Consequently efficient and cost-effective contention resolution is a key issue to be addressed...
During the last two decades, wavelength conversion has received a considerable attention due to its strong influence on the blocking performance of wavelength-routed WDM networks. However, most of the related works focus on only one aspect of wavelength conversion, i.e., sparse or partial or limited wavelength conversion. Although these approaches outperform the full wavelength conversion, there has...
Maximum Power Point Trackers (MPPT) systems are essential devices employed to maximize the power flow from a photovoltaic module (or array) to a load. In most of applications, the MPPT is composed by a DC-DC converter interposed between the referred photovoltaic module and load. Among the main DC-DC converters, the Buck-type and Boost-type are not proper for this purpose, since they cannot ensure...
An analytic method to evaluate frequency dependent losses in on-chip DC-DC buck converters is presented in this paper. These converters feature high switching losses caused by the skin effect in the package inductors. The frequency dependent air-core inductor model is shown to be critical in determining the optimal switching frequency. A general RLC parameter extraction method is also described. Considering...
This paper concentrates on the modeling and control of three-phase stand-alone photovoltaic (PV) generation system. The system is mainly composed of a solar array, dc/dc boost converter, three-phase inverter, system controller, and an output load. Sliding mode controllers are used for boost converter and three-phase inverter to achieve the maximum power output, regulated DC voltage, and the desired...
The paper introduces an effective toolbox for engineers, researchers and students to design and study electric drives. The described package eDrive includes a database of motors, power converters, and gears, an object-oriented simulator, a virtual signal generator, the module of the torque/current, speed, and path controllers, as well as the suitable visual interface. The system provides for the development,...
This paper investigates the problem of appropriate load sharing in an autonomous microgrid. High gain angle droop control ensures proper load sharing, especially under weak system conditions. However, it has a negative impact on overall stability. Frequency-domain modeling, eigenvalue analysis, and time-domain simulations are used to demonstrate this conflict. A supplementary loop is proposed around...
This paper presents a new average modeling approach for 24-pulse rectifiers. The model is based on the former non-linear averaged value models for different configurations of an 24-pulse rectifier. The models allow rectifier and drive system interactions to be examined analytically, or through rapid simulation. The models are validated by comparison with a detailed circuit simulation.
Nowadays, black-box behavioral models of power converters are becoming interesting for system-level analysis. These models can be used to evaluate the response of power electronics systems which are composed of commercial converters, since they can be fully parameterized by analyzing the actual converter response. First black-box models of power converters have been recently proposed, but all of them...
The paper deals with optimized design of parameters of the main circuit of LLC resonant converter with output power of 1 kW designed for distributed power systems application. The switching frequency should be 500 kHz, therefore the optimization of main circuit in the way of proper transformer design and selection of compromise between conduction losses, switching losses and regulation range with...
This paper describes the principle of operation of the modular multilevel converter (M2C) and presents a new PWM scheme which can be applied for an arbitrary number of voltage levels. Simulation results are presented for a 6 kV, 6.24 MVA converter. Particular attention is paid to the converter specific phenomenon of circulating currents.
The aircraft secondary electric power supply is an important composition of aircraft power supply system. Its performance affects the reliability and safety of the aircraft. This paper introduced the function and loads of the secondary electric power system and established the models of three-phase static inverter, DC-DC converter, over-current protection and steering engine in Saber firstly. Through...
In last years, behavioral models of power converters are becoming an interesting tool for the system level analysis of power electronics based systems, when these ones are composed of converters whose internal data are unknown. In this paper, a new "grey box" behavioral modeling and identification procedure for voltage mode controlled buck derived converters is proposed. The model is composed...
Suitable model for the analysis and control of the Unified Power Quality Controller (UPQC) was quite difficult to obtain, which prohibited not only the analysis and comparison between existing control strategies, but also the industrial applications, as no generalized method to design the control loop for different disturbances. In this paper, a unified DC voltage compensator design is proposed for...
A high order contactless power supply based on a current-fed full-bridge resonant converter is modeled using GSSA (generalized state space averaging) method. After representing the inverting networking and the rectifier with voltage and current controlled sources, both continuous and discrete models are derived to analyze the steady-state and dynamic performance of the system. The results obtained...
Nowadays, "black box" behavioral models of power converters are becoming interesting for system level simulation of power electronic based systems. Hence, new modeling and identification procedures become needed. In this paper, an easy modeling method and identification procedure based on a transient response analysis is presented. Using this method, a behavioral model with reduced order...
This paper presents the application of black-box terminal characterization models (BBTC) for the simulation and analysis of distributed power electronics systems composed by commercial power electronics converters and filter modules. The models are shown to effectively predict the transient and steady state response of interconnected distributed power systems. They are also used to predict the small-signal...
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