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This paper presents a novel MPEG media transport (MMT) system based Desktop-as-a-Service (DaaS) system. Compared with the legacy virtual desktop infrastructure (VDI) based DaaS systems which consider the screen as a combination of various elements (such as text, images, icons etc.) and maintain multiple data channels for communication, the new system treats the desktop screen rendering as a video...
MPEG has developed a new multimedia transport protocol namely MMT for heterogeneous network transport. Considering the characteristics of both broadcast network and internet, MMT has many advantages compared to traditional transport protocols like MPEG2-TS, RTP and so on. Although MMT has defined a detailed transport protocol for broadcast delivery, the broadband transport protocol of MMT has not...
In this work, a single input multiple output (SIMO) transcoding architecture is proposed. SIMO will benefit the mobile edge computing (such as HTTP Live Streaming requiring multiple copies of the video streams at different quality levels) without resorting to the legacy transcoding that video stream is completed decoded and encoded multiple times without exploring the compressed information. Leveraging...
The AC power source can be tested by the PEL (Power Electronic Load) expediently and economically. The GCC(Grid-Connection Converter) of the PEL should send back the recycling energy to the utility grid with high power factor and low harmonics components. Considering that the single phase PEL can be widely used to test the single phase or three phase power source, the single phase PEL is analyzed...
Base on the Multi-Agent System with basic research and Multi-Agent Intelligent Management Information System for theory and application, to design a framework for intelligent management information system model thereby achieve this model's implementation strategy. Firstly, describe the principle of Agent technology and Agent system. Secondly, provide the method and process of Intelligent Management...
By defining power electronic load cell (PEL cell) and adopting different control strategies, the application of power electronic load for both AC and DC source is presented in this paper. A unified power electronic load is proposed which is composed of three basic PEL cells. Improved repetitive control is proposed to improve the dynamic performance of the system. Theoretical analysis and simulation...
A novel power electronic load (PEL) is introduced in this paper. This equipment can simulate R,L,C load as well as non-linear load. Furthermore, it can recycle the energy back to grid. Topology for single phase AC PEL, three-phase AC PEL, and DC PEL are presented firstly. Based on disadvantages of repetitive controller, an improved repetitive controller is presented to improve the dynamic performance...
Feature extraction for coupler curves is a key technique for the approximate synthesis based on the electronic atlas. A new extraction based on wavelet multiresolution analysis (MRA) and fractal theories is presented. The suitable basic wavelet, the decomposition level for MRA and algorithm for fractal dimensions were determined through experiments. The features, obtained from wavelet coefficients...
This paper presents a novel digital control scheme for single-phase PWM rectifier for reducing AC-side harmonic currents and improving power factor. The proposed inner current loop is a predictive controller with a plug-in repetitive learning controller, it can achieve zero tracking error and simultaneously hold a fast response with the DC load disturbance. A digital notch filter is added to the outer...
A novel static compensator (STATCOM) is proposed in this paper. The new STATCOM is constructed by a hybrid topology cascading a neutral-point-clamped (NPC) inverter and several identical H-bridge inverters. With the novel topology consisting of a same DC bus voltage but different structure modules, the realization of a multilevel converter using a hybrid approach that involves higher voltage devices...
The paper present a new test equipment for single-phase ac power source tests named PEL(power electronic load), the proposed architecture consists of two power stages such as input AC-DC imitation converter to imitate various loads and the output grid-connection converter to send back the recycling energy to the utility grid. In PEL, the controllable imitation converter enlarges the load bound that...
PWM VSR is widely used in different power equipments to depress the harmonic of the ac-side current and improve power factor. In this paper, the operating principle and the control scheme of the single phase PWM rectifiers are introduced firstly, P(proportion) controller is used in the ac current control loop to ensure the ac-side current track the current reference fast, the related equations are...
A single-phase rectifier based on neutral-clamped converter (NPC) is proposed to achieve high power factor, lower current distortion and low voltage stress of power semiconductors. The principle of single-phase three-level PWM rectifier is introduced. Neutral-point balance problem is an inherent problem of three-level converter, so a bangbang control method is schemed to control the capacities' voltage...
In this paper mathematical model in d-q-0 coordinates is established for 3-phase 4-wire active power filter (APF) . A novel deadbeat control scheme for 3-phase 4-wire APF is proposed. Utilizing harmonic predictor, the harmonic current at the coming sampling instant can be predicted accurately. Meanwhile, the sufficient condition for keeping the repetitive harmonic predictor stable is proposed for...
To cope with increasing nonlinear loads in power system, this paper proposes an active power filter(APF) suitable for parallel operation. This APF solves the problems of capacity enlargement. This APF operates independently and has the capacity limitation function of compensating load harmonics. Furthermore, an optimal approach under capacity-limitation is provided for calculating the compensating...
In this paper, a novel single-phase five-level inverter is presented to alleviate harmonic components of the output voltage. To keep the output voltage being sinusoidal and to have the high dynamic performance, the paper present a control scheme based on repetitive control with the feedback of the capacitor current. In order to expediently observe the capacitor current, the author uses a dimensionality...
In this paper, a novel single-phase five-level inverter only using five power switches is presented to alleviate harmonic components of the output voltage. The derivation of the topology and its modulation methods are analyzed in the paper. In AC system, nonlinear loads are major sources of total harmonic distortion (THD), so the repetitive control system is given to keep the output voltage being...
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