Zhong Chen

A Multi-Objective Improved Space Vector Modulation Method for Three-Level Inverter

Jiakai Gan, Zhong Chen, Zixuan Liu, Yang Ma et autres

This paper investigates the T-type three-level topology. Based on quantitative analysis of voltage generation mechanism, the common mode (CM) reduction space vector modulation (CMRSVM) of T-type three-level inverter was studied. Based on virtual vector construction and regulation, an improved virtual space vector …

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Ageing Behaviors of Polypropylene Film under the Operating Condition of Oil-Impregnated Capacitors

Yang Chu, Yuxin Cui, Zhiyuan Li, Lu Cheng et autres

With the increasing demand of energy storage density ($U_{\mathrm{e}}$) of capacitors in power system, the performance of biaxially oriented polypropylene (BOPP) film faces gradually increasing gap to meet the demand of capacitors. Researches on the dielectric materials with high$\boldsymbol{U}_{\mathbf{e}}$have achieved remarkable results, …

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Design and Implementation of the Hierarchical Face Database Platform for Multi-scene Applications on University Campus

Yue Chen, Siyu Shao, Zhong Chen, Jiang Yanxia et autres

To solve the prevailing problems in the construction and use of face databases on university campus, such as duplicate construction, duplicate data collection, and blocked data sharing, a hierarchical face database platform for multi-scene applications was designed. This paper reports its overall …

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Comparison of EMC Chamber Debugging Techiniques above 1GHz

Yibo Wang, Zhong Chen

Site VSWR test is specified in the CISPR 16 standards for evaluating sites above 1GHz. The CISPR Svswr method consists of a series of scalar measurements and offers no additional information on how one can debug a chamber failure. The Time Domain …

Influence of Water Molecules on Polarization Behavior and Time–Frequency Dielectric Properties of Cellulose Insulation

Hao Wen, Lin Cheng, Yi Jiang, Taiyun Zhu et autres

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AC Flashover Characteristic at the Triple Junction of the Oil-Pressboard Insulation

Hao Wen, Lin Cheng, Yi Jiang, Taiyun Zhu et autres

Oil-pressboard insulation in transformers is prone to surface tracking or creeping discharge during operation. The oil-pressboard interface is believed to be one of the weakest points in the insulation system. In this paper, AC flashover characteristic at the triple junction of the …

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Site contributions for radiated emission measurement uncertainties above 1 GHz

Zhong Chen, Zubiao Xiong

Guidance on accounting for site imperfections in the uncertainty evaluation of emissions measurement result is provided by CISPR 16-4-2. Site Voltage Standing Wave Ratio (SVSWR) results from the chamber are used as the basis for estimating the uncertainty contributions due to the …

A Smooth Hole-Filling Method for Reconstruction Models

Zhong Chen, Zhiwei Hou, Shaohua Luo, Tianran Yuan

Reconstruction models extracted from industrial computed tomography data may contain holes. A novel smooth hole-filling method is proposed. Firstly, we fill the holes by the minimum area triangulation, and then use refinement and edge swap principle to refine the obtained patch meshes. …

A preview of draft ANSI C63.25 Time Domain site VSWR method

Zhong Chen

ANSI C63.25 is a new standard that is under development by the ANSI Accredited Standards Committee C63®-EMC. The idea behind the ANSI C63.25 is that it will encompass all EMC test site requirements for both below 1 GHz and above 1 GHz. …

A single-stage grid-connected flyback inverter with power decoupling function

Zhong Chen, Mengnan Li, Qunfang Wu, Yaming Xu

In this paper, a novel single-stage flyback inverter with power decoupling function is proposed. An auxiliary circuit responsible for dealing with power pulsation is introduced. Besides power pulsation decoupling, auxiliary circuit also offers flowing path for transformer's leakage energy. Voltage control loop …

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Estimating fuel consumption and emissions based on reconstructed vehicle trajectories

Zhong Chen, Chao Yang, Anthony Chen

SUMMARY Microscopic emission models are widely used in emission estimation and environment evaluation. Traditionally, microscopic traffic simulation models and probe vehicles are two sources of inputs to a microscopic emission model. However, they are not effective in reflecting all vehicles' real‐world operating …

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Mechanism and suppression countermeasure of voltage oscillation for full bridge converter

Zhong Chen, Liangchen Shi, Feng Ji

A phase-shift full-bridge zero voltage switching (ZVS) pulse-width-modulated (PWM) converter with commutation capacitor and LC auxiliary circuit is proposed. This converter contains the advantages of small rectifier voltage oscillation as well as no duty cycle loss, and realizes ZVS for all primary …

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