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A new dual-input and dual-output switched capacitor (SC) converter is designed to operate with two independent voltage sources that provides two different output voltages. The only converter generates 32 voltage conversion ratios (VCRs). The converter is portable to operate with one or two input sources alternatively and having the ability to vary 32 voltage ratios. An efficient low power SC converter...
Modular Multilevel Converter (MMC) has great application prospects for the flexible HVDC transmission, high-power motor drive and so on. In this paper, a discrete-time model of the MMC based on the virtual ergodic method is proposed for the typical MMC topology. First, the MMC topology is analyzed and its continuous-time model is established. Then, the state equation in the continuous-time model is...
This paper proposes an approach to model switched Ethernet communication within a model- and component-based software development framework for vehicular distributed embedded systems. The paper also presents a method to extract the network timing model from the systems that use switched Ethernet networks. In order to provide a proof of concept, an existing industrial component model and its tool suite,...
This paper presents an analytical model to provide a rapid estimation of the steady-state averaged power loss of a T-type STATCOM with Virtual Zero level Modulation (VZM) to balance the neutral point voltage. A case study is then conducted on a 54kVA rated T-type STATCOM system to investigate the power loss distribution over power devices and variations over switching frequency. A comparison is made...
A novel modification of the Z-source circuit breaker topology is presented for low voltage applications. An ultra-fast mechanical switch has been used in place of the solid-state switch (thyristor) in the Z-source circuit breaker to reduce the energy loss utilizing the very low resistance of mechanical contactors. The proposed modification also facilitates bi-directional current flow for distributed...
Inverters are widely applied in industrial fields. To acquire the analytical solution of sinusoidal pulse width modulation (SPWM) Single-phase inverters, a traditional harmonic balance based method is extended, in which the double Fourier transform is used to describe the nonlinear switching function of the converter. Thus the steady-state periodic solution of the inverter can be obtained by our approach...
The pump back test is widely adopted in the industry for characterizing and qualifying the high-power converters. One popular pump back test mode is to tie the DC link of two converters together and circulate the current through the inductor connected between the AC terminals. In this mode, one of converter operates in voltage mode to generate the virtual grid and another converter regulates the circulating...
A high step-up switched-capacitor based converter is proposed in this paper. The proposed converter features high conversion ratio, low voltage stress and continuous input current, which makes it very suitable for renewable energy applications like photovoltaic systems. More importantly, the proposed switched-capacitor cells in series with converter can be generalized in two ways, resulting in dc-dc...
The advantages of the Modular Multilevel Converter (MMC) as a Voltage Source Converter (VSC) is well known. These includes scalability, increased reliability, lower Total Harmonic Distortion (THD) in output variables, fault tolerance and so forth. The MMC has found its most application in High Voltage DC (HVDC) systems again because of the stated advantages. In the analysis of such systems, because...
Presently, many industries are facing strong challenges related to the demand of customized and high-quality products. These pressures lead to internal company's conflicts where current production systems have a rigid structure, forcing the company into a organization stall when a fast product change is required. Therefore, the need to smoothly migrate traditional systems into more feature-rich and...
A comparative study of modified models for calculating the switch capacitance of electrostatically actuated fixed-fixed beam MEMS shunt switch has been presented considering the effect of beam perforation and dielectric layer simultaneously. Two different capacitance calculation methods using Yang model and Mejis model have been considered in the analysis incorporating fringing field effect due to...
Different power grid operation mode corresponds with different short-circuit capacity distribution, while different distribution of short-circuit (current) capacity is contradictory to power grid operation performance and equipment tolerance influence consequence. This paper establishes functional relationship between short circuit (current) capacity of power grid and effective switch set and feasible...
The interleaved converter has may advantages such as low power losses and small output current ripple. The output current ripple of interleaved converter is the key parameter for the filter inductor design and the overall converter optimization. In this paper, the output current ripple behavior of interleaved Buck converter is analyzed, both in CCM and DCM. Further, a simplified numerical method for...
Network virtualization offers flexibility by decoupling virtual network from the underlying physical network. Software-Defined Network (SDN) could utilize the virtual network. For example, in Software-Defined Networks, the entire network can be run on commodity hardware and operating systems that use virtual elements. However, this could present new challenges of data plane performance. In this paper,...
Software Defined Networking (SDN) is a new network architecture that separates control plane and data plane. SDN switch models in the literature primarily use queueing theory in two distinct categories: (i) single shared buffer for control plane traffic and data plane traffic, and (ii) buffer with two priorities to isolate control plane and data plane traffic. Several research works have independently...
Pumping optimization in water distribution networks means to schedule the ON/OFF status of pumps over a typical operating cycle, pursuing the minimum energy cost for pumping and matching technical requirements, e.g. sufficient pressure to satisfy customers' water requests, null water deficit at tanks, avoid complete emptying and overflows of tanks. In aged water distribution networks, pump scheduling...
This paper overviews the literature pertaining to the stability analysis of systems with delay-dependent coefficients, which can arise from various scientific and engineering applications. Research on Stability analysis for systems with a single delay is first reviewed, followed by a discussion of some techniques also applicable to the multiple-delay case. We attempt to provide the main ideas of various...
The method based on analytic models can be used when the system behavior is compared with the results of the mathematical model which reproduces the system in normal operation conditions. The paper applies the diagnosis method based on the analytic model by investigating the waveforms of the currents and voltages specific to a transport and distribution line when interruption fault occurs. For identifying...
To avoid large overvoltage when the current of the dc-link inductor is interrupted, overlap time is added to the drive signals in current source converters, which results in the extra harmonic in grid current. Waveforms of AC side current before and after added overlap time are achieved from analysis of the current commutation process. The expression of overlap current is given according to the pulse...
In this paper, the dynamic characteristics of two types of electromagnetic repulsive force actuators are compared using the simulation of finite element method. The two electromagnetic repulsive force actuators are equipped with a single-sided coil and a double-sided coil respectively. Initially, the construction and theory of each of the electromagnetic repulsive force actuators are discussed. Subsequently,...
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