The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Grid-connected inverter is an important part of the grid-connected system. Compared with the traditional L or LC filter, LCL filter has a better high-frequency harmonic attenuation performance. However, LCL filter has resonant peak, which has a great influence on the stability of the system. This paper first analyzes the effect of passive damping method on the resonance peak; then a double closed-loop...
Power switch devices which base on wide band-gap (WBG) semiconductor, such as silicon carbide metal-oxide-semiconductor-field-effect-transistor (SiC MOSFET) and gallium nitride high-electron-mobility transistor (GaN-HEMT) perform superior performance as compared with silicon (Si) MOSFET in high switching frequency, high blocking voltage, and high temperature operation. In this paper, a series of characteristic...
We study the problem of dynamic content replacement in terms of network state variation in elastic optical datacenter networks. A dynamic content replacement scheme is proposed to minimize spectrum consumption, blocking probability and network latency.
High spectrum efficiency and flexibility are the advantages of elastic optical network, which is the future direction of optical network development. Routing and resource allocation is one of the core technologies of flexible optical networks. This paper propose an improved RSA algorithm in the elastic optical network which based on OSNR impairment model. It considers both QoT (quality of transmission)...
In this paper, we develop two joint routing and resource allocation algorithms for stealth and ordinary services in optical networks. The transmission of stealth service needs to be hidden in ordinary services to achieve a better performance in privacy. Two heuristic algorithms construct paths for stealth and ordinary services base on the different routing methods. The proposed algorithms improve...
We study the problem of joint spectrum and storage resource backup (JSSRB) to improve the survivability of elastic optical datacenter networks (EODNs) for cloud services. An ILP model and heuristic algorithms are developed. Simulation results show that JSSRB can effectively improve the survivability and spectrum efficiency of EODNs.
We propose an inter-core crosstalk-aware routing, spectrum and core allocation scheme with spectrum bands and spatial Sp-Chs in multi-dimensional optical networks to get higher SE and lower XT. 15% reduction in XT is achieved.
An optical TDM system is experimentally demonstrated with sFlow based elephant flow detection and a DPDK based online timeslot allocator. With proposed timeslot allocation algorithm, allocator could have 383 Gbps throughput and continuous timeslots allocation.
The high power density converter is required due to the strict demands of volume and weight in more electric aircraft, which makes SiC extremely attractive for this application. In this work, a prototype of 50 kW SiC high power density converter with the topology of two-level three-phase voltage source inverter is demonstrated. A gate assisted circuit is further introduced to reduce the switching...
The weight of the LCL filter is a major contributor of the total weight of a high power converter, especially the inverter-side inductor. The design of the inverter-side inductor requires multi-domain optimization in electromagnetic design, weight reduction, and thermal management with the objective of meeting power quality standards. In this paper, the inverter-side inductor, based on Amorphous core...
The high power density converter is required due to the strict demands of volume and weight in more electric aircraft, which makes SiC extremely attractive for this application. In this work, a prototype of 50 kW SiC high power density converter with the topology of two-level three-phase voltage source inverter is demonstrated. This converter is driven at high switching speed based on the optimization...
This paper presents the benefits of interleaving three phase voltage source converters (VSCs) to improve the power density. The output harmonics are also analyzed in frequency domain, then design and optimization of coupled inductor and output filter are given. Verifications are carried out through electrical circiut and electromagnetic's FEM simualtions. Finally, the inductor weight are compared...
This paper demonstrates a 60kHz 50kW/400Hz grid facing three-phase power converter using commercially off-the-shelf Silicon Carbide (SiC) module. The power converter is designed to achieve high gravimetric density for possible application in future aircraft. In order to achieve high power density, the power converter is operated with high switching frequency to minimize its LCL filter size that connects...
This paper addresses the RMLSA problem for end-to-content paths while satisfying k-node (edge) content connectivity requirement in elastic optical datacenter networks. Two distance-adaptive SWP-based RMLSA algorithms are proposed to improve the spectrum efficiency.
The power converter for more electric engine in aircraft requires high power density, which makes SiC extremely attractive for this application. In this work, a 50 kW SiC high power density converter with the topology of three-phase two-level voltage source inverter is developed. Meanwhile, an accurate mathematical model for the power loss and efficiency calculation is proposed, which is based on...
Disaster, natural or man-made, is the main threaten of survivability and reliability of networks. The development of content connectivity provides a new way of protection against disaster to ensure the reliability of network service/content. This paper focuses on shared backup path protection based on content connectivity against disaster in the context of elastic optical datacenter networks. In this...
With the growth of cloud computing and data center (DC), data center networks (DCNs) is becoming an increasingly important part in the future networks. However, large-scale disasters are considered as the main problems in terms of network survivability. Therefore, we propose a data center recovery algorithm to protect the majority of customer service as soon as possible. This algorithm can maximize...
The increasing demand for high power density requires power converter to operate in high switching frequency. SiC power module is regarded as one of the most promising candidates for high-frequency applications due to the superior switching speed and low switching loss. The conventional strategy to optimize switching loss is normally achieved by repetitive double pulse tests, which is time-consuming...
The high switching frequency (> 20 kHz) of SiC MOSFET module makes it as an attractive alternative of Si IGBT module for high power density applications. Since SiC MOSFET and Si IGBT have the similar MOS-gated structure, it is normally regarded that the gate driver of SiC MOSFET can directly inherit from that of Si IGBT. However, considering the different device physics properties, some special...
We propose a shared protection scheme based on the sharing principle among multiple end-to-content backup paths in optical datacenter networks. Numerical results show it can reduce wavelengths consumption while ensuring the survivability against multi-failures.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.