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Yang X.W.,Shanghai University of Electric Power | Ouyang W.,Jiangxi Nanchang Power Supply Company | Yuan S.,Jiangxi Nanchang Power Supply Company
Applied Mechanics and Materials | Year: 2014

This paper proposes a new power electronic transformer (PET) to be used for distribution system, which is composed of the three-stage power circuits. The input stage uses Modular Multilevel Converter(MMC) to reduce the voltage stress rating of components, meanwhile, the harmonic components in the current will be deduced significantly, to make DC capacitor voltage of MMC rectifier balance, a control method is proposed. The isolation stage use a middle-frequency transformer to realize voltage conversion and isolation of the low-voltage side from the high-voltage side. In the third-stage, a inverter outputs the desired voltage and power to the load. The simulation results are presented to show the validity of the proposed PET system. © (2014) Trans Tech Publications, Switzerland.

Pingping F.,Communication Power Corporation | XueWen C.,Jiangxi Fuzhou Power Supply Company | Zhen L.,Jiangxi Nanchang Power Supply Company | Yanqing C.,Jiangxi Electrical Power Corporation | Li Z.,Jiangxi Electrical Power Corporation
Advanced Materials Research | Year: 2012

To automatically obtain the real-time data of electric power information equipments and improve management level on intelligent inspection, a technical framework based on internet of things (IOT) is provided for information equipment inspection in electric power system. It provids new data sources efficiently and improves intelligent inspection level. Architecure of the proposed three layer framework is given. And key technologies and functions are discussed. Finally three layer software constuct is illustrated. After the upgrading the existing system, the results show inspection system based on IOT is more secure, reliable, and easy to use and maintain. All of these features embody the meticulous management of information equipment. The study accelerates the application of IOT in smart grids.© (2012) Trans Tech Publications, Switzerland.

Yufeng H.,Jiangxi Nan Chang Power Supply Company | Bin L.,Nanchang Hangkong University | Jun L.,Nanchang Hangkong University
Advanced Materials Research | Year: 2012

Proportional-resonant is introduced in PFC controller design and the coefficients are easy to tune. Zero-tracking-error can be achieved for the fundamental frequency and selective harmonic compensation can be achieved as well. Also a novel Phase-Loop-Lock controller is given based on which a self-adaptive proportional resonant PFC controller is induced at last. © (2012) Trans Tech Publications, Switzerland.

Cai L.,Huazhong University of Science and Technology | Cai Y.,Jiangxi Nanchang Power Supply Company | Lin F.,Huazhong University of Science and Technology | Li L.,Huazhong University of Science and Technology | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2013

In order to offer assistance for the quantity estimation and analysis of time delay of three-electrode trigatron switches, a numerical model of the time delay was derived based on the electronic avalanche development theory and the streamer theory. In the model, whether the electrical field satisfied the Raether breakdown criterion for streamer formation was proposed to explain the difference of breakdown modes. To verify the mathematical model, a three-electrode trigatron gap was fabricated, and its characteristics in dry air were determined experimentally. Moreover, the influence of some different parameters on the gap's breakdown time was discussed, and it was found the gap more likely worked in directly breakdown mode. The experimental results and analysis demonstrate that the delay time curve can be divided into three regions by two inflection points of under-voltage ratio. The first inflection point is the low limit of under-voltage ratio for reliable breakdowns, and the second one is a transition point of the gap's breakdown mechanism. Considering the working reliability, the experimental results show that the operating voltage range of 0.5~0.7 is reasonable, providing a reference for design of three-electrode trigatron switches.

Li S.K.,Jiangxi Nanchang Power Supply Company | Xu Y.,Jiangxi Nanchang Power Supply Company | Mei J.S.,Jiangxi Nanchang Power Supply Company | Zhang J.,Tellhow Software Co.
Applied Mechanics and Materials | Year: 2013

The purpose is to implement data sharing and exchange of each application system, establish integrated & technology-supported platform for regional grid dispatching, build data source based on EMS system and platform of visual panoramic model and interoperation centered on CIM, realize visual and unified management of regional grid data and basic resource sharing and exchange, promote construction and development of application integration system and intelligent grid management in Nanchang area. © (2013) Trans Tech Publications, Switzerland.

Hu Z.-B.,Jiangxi Nanchang Power Supply Company | Zeng Q.-H.,Jiangxi Nanchang Power Supply Company | Zhou D.-D.,Jiangxi Nanchang Power Supply Company | Huang J.-N.,Jiangxi Nanchang Power Supply Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

This paper, in accordance with a power transmission operation accident in 220 kV transformer substation, elaborates the analytical means of the accident in detail. The range of the accident is defined by analyzing the trip reports and wave records of the protections at the M/N side. On that basis, the bus protections of the side N are checked and the fault of the bus protections is eliminated. In the light of the fact that the equipments in the substation are all gas insulated switchgear (GIS), we divide the range of the accident, make an insulation test level by level, find out the exact origin of the accident. Finally, the fault location is checked and confirmed, and the doubts are solved.

Fu X.-Q.,Jiangxi Nanchang Power Supply Company | Xu L.-Z.,Jiangxi Nanchang Power Supply Company | Zhao B.-L.,Jiangxi Electrical Power Design Institute
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

The paper expounds and analyses the technology principle about 10 kV grounding through small resistance. And it discusses the technology principle about choosing equipment. What's more, it summarizes the process and result of using the technology in 110 kV distribution system of Nanchang power grid and accumulates operation experience such as its influences on the reliability of power supply, the influence of fault instantaneous voltage and current on electrical equipment, the influence on comunnmunication and requirements for relay protection, etc.

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