Nanjing, China
Nanjing, China
SEARCH FILTERS
Time filter
Source Type

Patent
State Grid Corporation of China, Huainan Power Supply Company of State Grid Anhui Electrical Power Corporation and NARI Group | Date: 2015-08-24

The invention discloses a fault point locating method of hybrid lines based on analysis of comprehensive characteristics of single-end electric quantity and transient travelling waves, which mainly includes steps: phase-model transformation; looking up initial time of failure; extracting timing window data after the initial time; searching a reflected wave from the fault point and a reflected wave from a demarcation point in the timing window; and judging properties of the reflected waves. After failure of a hybrid line with cable and overhead line, by identifying and comparing comprehensive characteristics of the reflected wave from the fault point, primary and secondary reflected waves from the demarcation point in the single-end transient voltage and current travelling waves, it is rapidly judged whether the fault point is located in the overhead line segment or the cable segment, which is used to assist in switching decision for line reclosing.


Zheng Z.,NARI Group
Proceedings of 2016 IEEE Advanced Information Management, Communicates, Electronic and Automation Control Conference, IMCEC 2016 | Year: 2016

As the most important part of static synchronous generator (STATCOM), cascade valve group should be carried on the strict test, if the reliability of the device is high requirement. This paper presents a suitable control strategy for cascade valve group, and introduces the micro-grid islanding control. V/ control is used as a modulation signal of link, it can provide the necessary support for system voltage and frequency. The control reference signal generation is used as another link modulation signal, meanwhile, a detailed design method of the connection reactor is proposed. Finally, the simulation model structure is consistent with the actual control system in PSCAD/EMTDC, verifies the correctness and feasibility of the control strategy. © 2016 IEEE.


Wu T.,NARI Group
Proceedings - 2016 8th International Conference on Intelligent Human-Machine Systems and Cybernetics, IHMSC 2016 | Year: 2016

Intelligent recognition based on machine vision can't be separated from the image processing and analysis, but the process of images acquired,transmitted and saved is vulnerable to interference of various factors, inevitably there will be degradation and distortion of the image. Specially numeric characters printed on SMD resistor is small, magnified image degradation is serious, even character issues such as adhesions, which brought great difficulties to image recognition. For this class problem, paper proposed a fast efficient of character segmentation and based ongravity and strokes line of classification decision tree recognition method, the method through on pretreated of image for by column scan analysis character of high, wide and features, can be effective to eliminate invalid strokes and segment out more normative single character (including adhesion character of segmentation), then through positioning character upper half part and bottom half part of mass points, analysis strokes anyway line to extraction features, last through decision tree for recognition, experiment proved the method is shortcut, efficient, strong anti-interference ability, robust, and can effectively recognize some faults and deformation of the nonstandard characters. © 2016 IEEE.


Shen G.,NARI Group
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

In order to build up intelligent power dispatching of bulk power grid, integration of secondary system in power control center and substations needs standardized and modular secondary system construction which results in information interaction more flexible. Implementation of secondary system integration is with multi-specialty technology merging. Some key technologies including grid fundamental data enhancement, application support platform, and advanced power analysis software (PAS) for intelligent power dispatching of bulk power grid are studied. In respect of building grid fundamental data, SCADA supporting system with united time stamped measurements is designed. In respect of support platform, general solution scheme of integrated application support platform is proposed. In respect of new PAS, fast status estimation based on time stamped measurements, on-line self-adaptive defense lines, real-time pre-warning and pre-control system are put forward. © 2012 State Grid Electric Power Research Institute Press.


This report studies Smart Grid T&D Equipment in Global market, especially in North America, Europe, China, Japan, Southeast Asia and India, focuses on top manufacturers in global market, with production, price, revenue and market share for each manufacturer, covering Market Segment by Regions, this report splits Global into several key Regions, with production, consumption, revenue, market share and growth rate of Smart Grid T&D Equipment in these regions, from 2011 to 2021 (forecast), like Split by product type, with production, revenue, price, market share and growth rate of each type, can be divided into Split by application, this report focuses on consumption, market share and growth rate of Smart Grid T&D Equipment in each application, can be divided into Global Smart Grid T&D Equipment Market Research Report 2016  1 Smart Grid T&D Equipment Market Overview  1.1 Product Overview and Scope of Smart Grid T&D Equipment  1.2 Smart Grid T&D Equipment Segment by Type  1.2.1 Global Production Market Share of Smart Grid T&D Equipment by Type in 2015  1.2.2 Smart meters  1.2.3 Sensors  1.2.4 Low-voltage solar inverters  1.2.5 Substation and feeder automation  1.2.6 High-efficiency distribution transformers  1.3 Smart Grid T&D Equipment Segment by Application  1.3.1 Smart Grid T&D Equipment Consumption Market Share by Application in 2015  1.3.2 Application 1  1.3.3 Application 2  1.3.4 Application 3  1.4 Smart Grid T&D Equipment Market by Region  1.4.1 North America Status and Prospect (2011-2021)  1.4.2 Europe Status and Prospect (2011-2021)  1.4.3 China Status and Prospect (2011-2021)  1.4.4 Japan Status and Prospect (2011-2021)  1.4.5 Southeast Asia Status and Prospect (2011-2021)  1.4.6 India Status and Prospect (2011-2021)  1.5 Global Market Size (Value) of Smart Grid T&D Equipment (2011-2021) 2 Global Smart Grid T&D Equipment Market Competition by Manufacturers  2.1 Global Smart Grid T&D Equipment Production and Share by Manufacturers (2015 and 2016)  2.2 Global Smart Grid T&D Equipment Revenue and Share by Manufacturers (2015 and 2016)  2.3 Global Smart Grid T&D Equipment Average Price by Manufacturers (2015 and 2016)  2.4 Manufacturers Smart Grid T&D Equipment Manufacturing Base Distribution, Sales Area and Product Type  2.5 Smart Grid T&D Equipment Market Competitive Situation and Trends  2.5.1 Smart Grid T&D Equipment Market Concentration Rate  2.5.2 Smart Grid T&D Equipment Market Share of Top 3 and Top 5 Manufacturers  2.5.3 Mergers & Acquisitions, Expansion 7 Global Smart Grid T&D Equipment Manufacturers Profiles/Analysis  7.1 ABB  7.1.1 Company Basic Information, Manufacturing Base and Its Competitors  7.1.2 Smart Grid T&D Equipment Product Type, Application and Specification  7.1.2.1 Type I  7.1.2.2 Type II  7.1.3 ABB Smart Grid T&D Equipment Production, Revenue, Price and Gross Margin (2015 and 2016)  7.1.4 Main Business/Business Overview 7.2 GE-Alstom Grid  7.2.1 Company Basic Information, Manufacturing Base and Its Competitors  7.2.2 Smart Grid T&D Equipment Product Type, Application and Specification  7.2.2.1 Type I  7.2.2.2 Type II  7.2.3 GE-Alstom Grid Smart Grid T&D Equipment Production, Revenue, Price and Gross Margin (2015 and 2016)  7.2.4 Main Business/Business Overview 7.3 Prysmian  7.3.1 Company Basic Information, Manufacturing Base and Its Competitors  7.3.2 Smart Grid T&D Equipment Product Type, Application and Specification  7.3.2.1 Type I  7.3.2.2 Type II  7.3.3 Prysmian Smart Grid T&D Equipment Production, Revenue, Price and Gross Margin (2015 and 2016)  7.3.4 Main Business/Business Overview 7.4 Schneider Electric  7.4.1 Company Basic Information, Manufacturing Base and Its Competitors  7.4.2 Smart Grid T&D Equipment Product Type, Application and Specification  7.4.2.1 Type I  7.4.2.2 Type II  7.4.3 Schneider Electric Smart Grid T&D Equipment Production, Revenue, Price and Gross Margin (2015 and 2016)  7.4.4 Main Business/Business Overview 7.5 Siemens  7.5.1 Company Basic Information, Manufacturing Base and Its Competitors  7.5.2 Smart Grid T&D Equipment Product Type, Application and Specification  7.5.2.1 Type I  7.5.2.2 Type II  7.5.3 Siemens Smart Grid T&D Equipment Production, Revenue, Price and Gross Margin (2015 and 2016)  7.5.4 Main Business/Business Overview 7.6 Aclara  7.6.1 Company Basic Information, Manufacturing Base and Its Competitors  7.6.2 Smart Grid T&D Equipment Product Type, Application and Specification  7.6.2.1 Type I  7.6.2.2 Type II  7.6.3 Aclara Smart Grid T&D Equipment Production, Revenue, Price and Gross Margin (2015 and 2016)  7.6.4 Main Business/Business Overview 7.7 NARI Group Corporation (NARI)  7.7.1 Company Basic Information, Manufacturing Base and Its Competitors  7.7.2 Smart Grid T&D Equipment Product Type, Application and Specification  7.7.2.1 Type I  7.7.2.2 Type II  7.7.3 NARI Group Corporation (NARI) Smart Grid T&D Equipment Production, Revenue, Price and Gross Margin (2015 and 2016)  7.7.4 Main Business/Business Overview


News Article | November 1, 2016
Site: www.newsmaker.com.au

Notes: Production, means the output of Smart Grid T&D Equipment Revenue, means the sales value of Smart Grid T&D Equipment This report studies Smart Grid T&D Equipment in Global market, especially in North America, Europe, China, Japan, Southeast Asia and India, with production, revenue, consumption, import and export in these regions, from 2011 to 2015, and forecast to 2021. This report focuses on top manufacturers in global market, with production, price, revenue and market share for each manufacturer, covering ABB GE-Alstom Grid Prysmian Schneider Electric Siemens Aclara NARI Group Corporation (NARI) By types, the market can be split into Smart meters Sensors Low-voltage solar inverters Substation and feeder automation High-efficiency distribution transformers By Application, the market can be split into Application 1 Application 2 Application 3 Would like to place an order @ https://www.wiseguyreports.com/checkout?currency=one_user-USD&report_id=718906 By Regions, this report covers (we can add the regions/countries as you want) North America China Europe Southeast Asia Japan India Global Smart Grid T&D Equipment Market Professional Survey Report 2016 1 Industry Overview of Smart Grid T&D Equipment 1.1 Definition and Specifications of Smart Grid T&D Equipment 1.1.1 Definition of Smart Grid T&D Equipment 1.1.2 Specifications of Smart Grid T&D Equipment 1.2 Classification of Smart Grid T&D Equipment 1.2.1 Smart meters 1.2.2 Sensors 1.2.3 Low-voltage solar inverters 1.2.4 Substation and feeder automation 1.2.5 High-efficiency distribution transformers 1.3 Applications of Smart Grid T&D Equipment 1.3.1 Application 1 1.3.2 Application 2 1.3.3 Application 3 1.4 Market Segment by Regions 1.4.1 North America 1.4.2 China 1.4.3 Europe 1.4.4 Southeast Asia 1.4.5 Japan 1.4.6 India 2 Manufacturing Cost Structure Analysis of Smart Grid T&D Equipment 2.1 Raw Material and Suppliers 2.2 Manufacturing Cost Structure Analysis of Smart Grid T&D Equipment 2.3 Manufacturing Process Analysis of Smart Grid T&D Equipment 2.4 Industry Chain Structure of Smart Grid T&D Equipment 3 Technical Data and Manufacturing Plants Analysis of Smart Grid T&D Equipment 3.1 Capacity and Commercial Production Date of Global Smart Grid T&D Equipment Major Manufacturers in 2015 3.2 Manufacturing Plants Distribution of Global Smart Grid T&D Equipment Major Manufacturers in 2015 3.3 R&D Status and Technology Source of Global Smart Grid T&D Equipment Major Manufacturers in 2015 3.4 Raw Materials Sources Analysis of Global Smart Grid T&D Equipment Major Manufacturers in 2015 4 Global Smart Grid T&D Equipment Overall Market Overview 4.1 2011-2016E Overall Market Analysis 4.2 Capacity Analysis 4.2.1 2011-2016E Global Smart Grid T&D Equipment Capacity and Growth Rate Analysis 4.2.2 2015 Smart Grid T&D Equipment Capacity Analysis (Company Segment) 4.3 Sales Analysis 4.3.1 2011-2016E Global Smart Grid T&D Equipment Sales and Growth Rate Analysis 4.3.2 2015 Smart Grid T&D Equipment Sales Analysis (Company Segment) 4.4 Sales Price Analysis 4.4.1 2011-2016E Global Smart Grid T&D Equipment Sales Price 4.4.2 2015 Smart Grid T&D Equipment Sales Price Analysis (Company Segment)


FANG Y.,NARI Group
Journal of Modern Power Systems and Clean Energy | Year: 2014

This paper aims at putting forward viewpoints regarding the use of stability technology to prevent and control cascading outages by examining recent blackout events. Based on the inquiry reports of the 2011 Southwest America blackout and the 2012 India power blackouts, event evolution features are first summarized from a stability perspective. Then a comparative analysis is conducted so as to propose suggestions of effective measures, either preventive or emergency, which could have avoided the blackouts. It is shown that applications of several mature technologies can create opportunities of preventing or interrupting the cascading development. These include offline dynamic simulation, online stability analysis and preventive control, real-time situational awareness and automatic emergency control. Further R & D directions are given to address the challenges of modern power systems as well. They cover system fault identification criterion of protection and control devices, verification of adaptability of control effect to system operating conditions, real-time operational management of emergency control measures and improvement of simulation accuracy. © 2014, The Author(s).


Wang W.,NARI Group
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

The necessity of building an integrated smart power network dispatching automation system is proposed. In addition, the necessity of integrated data communication between dispatching center and substation is presented, and the analysis on the problems of IEC 61970 and IEC 61850 data model, substation's diagram, telecontrol protocol, maintenance in the substation, subscribing/publish is also presented. The basic principles, the modeling method and communication service of telecontrol protocol based on IEC 61850 are proposed. On the basis of IEC 61850, the rule of model change between IEC 61850 and IEC 61970, realization method of maintenance in substation and subscribing/publish are put forward. © 2012 State Grid Electric Power Research Institute Press.


Gu J.,NARI Group
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2014

The promulgation of Tentative Standard on Practicality of Energy Management System (EMS) and Interim Procedures for Practical Acceptance of Energy Management System (EMS) is beneficial to the practicality of EMS and improvement on the security and economy of power grid operation. The state estimation (SE) is a fundamental function in EMS, and the values obtained through SE are also the fundamental data for analysis of other power grids and control functions. Some opinions differ from those as worded in the above two standards are discussed at the academic and technical level. © 2014 State Grid Electric Power Research Institute Press.


Shang L.,NARI Group | Hu J.,Huazhong University of Science and Technology
IEEE Transactions on Energy Conversion | Year: 2012

This paper proposes an improved direct power control (DPC) strategy of grid-connected wind-turbine-driven doubly fed induction generators (DFIGs) when the grid voltage is unbalanced. The DPC scheme is based on the sliding mode control (SMC) approach, which directly regulates the instantaneous active and reactive powers in the stator stationary reference frame without the requirement of either synchronous coordinate transformation or phase angle tracking of grid voltage. The behavior of DFIGs by the conventional SMC-DPC, which takes no negative-sequence voltage into consideration, is analyzed under unbalanced grid voltage conditions. A novel power compensation method is proposed for the SMC-based DPC during network unbalance to achieve three selective control targets, i.e., obtaining sinusoidal and symmetrical stator current, removing stator interchanging reactive power ripples and canceling stator output active power oscillations, respectively. The active and reactive power compensation components are calculated via a simple method and the proposed three control targets can be achieved, respectively, without the need of extracting negative-sequence stator current components. Experimental results on a 2kW DFIG prototype are presented to verify the correctness and validity of the proposed control strategy and power compensation method. © 2012 IEEE.

Loading NARI Group collaborators
Loading NARI Group collaborators