Gao X.,Guangdong Power Grid Corporation |
Yan Z.,Shanghai JiaoTong University
Dianwang Jishu/Power System Technology | Year: 2013
In view of the fact that smart grid leads on the development of power grid in future, it is imperative to assess the general development and construction level of smart grid reasonably and accurately and to measure intellectualization differences among regional power grids. Utilizing principal component analysis (PCA) and cluster analysis, the standardization, dimension-reduction and de-correlation of multiple evaluation index system for smart grid are performed to eliminate the re-weighting among original indices and assign principal component weights to evaluation indices; meanwhile utilizing principal component factor based clustering analysis of loading matrix and combining with actual meaning and evaluation direction of index categories, the design thought for classified index systems is proposed and the internal context of evaluation variables in original index system are sorted out; finally, the quantitative analysis of development and construction level of smart grin in specified region is performed by comprehensive principal component evaluation function and the transverse comparison of smart grids in different areas is carried out to provide helpful reference for the development of smart grid. The validity of the proposed PCA based assessment method and system is verified by related calculation example.
Yu W.,Shanghai JiaoTong University |
Liu D.,Shanghai JiaoTong University |
Yu N.,Guangdong Power Grid Corporation
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2013
With the integration of distributed generation (DG) and energy storage system (ESS), the active control system of distribution network should have the ability to reconcile global optimization and local autonomy of distribution network by actively managing the operations of DG, ESS and distribution network. Indicator of feeder control error (FCE) was proposed to represent differences between actual operating status and global optimized status. Constant interchange control mode and object tracking control mode based on FCE were presented for local autonomy control based on the global optimization. The effectiveness of the coordinate control methods of active distribution network based on FCE were verified by theoretical analysis and simulation. © 2013 Chin. Soc. for Elec. Eng.
Wen Z.,Tsinghua University |
Meng F.,Tsinghua University |
Chen M.,Guangdong Power Grid Corporation
Journal of Cleaner Production | Year: 2014
To evaluate the potential for energy conservation and CO2 emissions mitigation in China's iron and steel industry during 2010 and 2020, a detailed model was developed and applied based on Asian-Pacific Integrated Model (AIM). Three scenarios including the business as usual (BAU) scenario, the integrated policy (INT) scenario and the strengthen policy (STR) scenario have been set to describe future policy measures in relation to the development of the iron and steel industry. Results show that STR scenario in 2020 would realize an additional energy saving potential of 58.2 million tce accounting for 14.18% of the total energy consumption, while the potential for CO2 mitigation of 218.0 million ton CO2 takes up 14.53% of the predicted emission. And results indicate that technology promotion is the main driver for energy saving and emissions reduction, more than structure adjustment. In order to meet the targets set by the 12th Five-Year Plan in China's iron and steel industry, it is essentially to promote technologically advanced approaches with a high-demand policing rate. Specific energy conservation technologies could aid significantly to the cause. In the long term, energy saving and emissions reduction of China's iron and steel industry will rely mostly on technology promotion. © 2013 Elsevier Ltd. All rights reserved.
Zhang J.,Guangdong Power Grid Corporation
China International Conference on Electricity Distribution, CICED | Year: 2016
This paper studies the influences of lamp placement on power saving for indoor visible light communication systems. Four typical schemes are considered. By modeling the pulse waveform design of the communication system as a linear programming problem, power consumption is minimized for each scheme. Numerical results show that lamp placement is important for indoor visible light communication systems. When the power consumed by the controlling circuits is negligible, higher power saving efficiency can be obtained by dividing the LEDs into more uniformly spaced units each having a local controlling circuit while the total number of LEDs is kept unchanged. © 2016 IEEE.
Huang Q.,Guangdong Power Grid Corporation |
Xu G.,Guangdong Power Grid Corporation
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012
In order to further improve the stability analysis of a power system, a model for the turbine governing system is developed with the realistic governor model and the prime mover model is expressed as a higher order nonlinear transfer function. Three kinds of prime mover model identifying methods are built, namely, the improved least squares (LS) algorithm, genetic algorithm (GA) and particle swarm optimization (PSO) algorithm. Compared with the measured dynamic process, the simulation results of the custom model is more realistic than the model provided by BPA4.0 and capable of meeting the demand for power system stability analysis. ©2012 State Grid Electric Power Research Institute Press.
Li F.,Guangdong Power Grid Corporation |
Song J.,Guangdong Power Grid Corporation
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2011
Bio-briquette combustion technology, as one of the most effective ways for biomass utilization, has attracted more and more scholar's attention in recent years due to its potential benefits for both environment and energy conservation. In this paper, the combustion characteristic of bio-briquette was analyzed on the basis of biomass chemical composition, which was analyzed by a chemical extraction process. And then the bio-briquettes with different biomass compositions were burned in a thermal analytical balance furnace. The experimental results show that increasing the quantity of biomass will improve the combustion performance of bio-briquettes, where the main factor is the cellulose composition in biomass. If considering such three aspects as the ignition temperature, the biggest release rate of volatile matter and the burn-up temperature, to evaluate the combustion characteristics, it was found that the more cellulose contains, the better the combustion performance of bio-briquette is. Finally, the concept of combustion characteristics evaluating factor for biomass briquette was introduced to quantitatively evaluate the combustion performance of biomass briquette. © 2011 Chin. Soc. for Elec. Eng.
Sen L.,Guangdong Power Grid Corporation
Proceedings - 7th International Conference on Intelligent Computation Technology and Automation, ICICTA 2014 | Year: 2015
In this thesis, four typical algorithms for image feature extraction are studied first, by analyzing their advantages and disadvantages and according to the actual needs of the project, SIFT algorithm is selected to be the foundation of the research. By analyzing the disadvantages of SIFT and its relational improved model, based on the two way guiding and matching strategy, have proposed a new matching strategy with RANSAC and LM, with the filter of feature match points and the search of inliers, has solved the problems of big match error and low accuracy in the original SIFT algorithm. According to the sub-tests for improved algorithm in every period of image mosaic, the results show that the improved algorithm is better than the original one. In addition, the universality of improved algorithm has been tested, the result shows that the improved algorithm can meet the needs of various types of image mosaic, the universality of the algorithm is strong. © 2014 IEEE.
Xie S.,Guangdong Power Grid Corporation
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011
A new software system based on the uniform common information model (UCIM) and substation configuration descriptive language (SCL) has been developed. The power grid model used by the control center is automatically built from the model of digital substations, and real-time data is retrieved through the abstract communication service interface (ASCI). The static model and real-time data between the digital substations and the control center are seamlessly integrated. © 2011 State Grid Electric Power Research Institute Press.
Su H.,Guangdong Power Grid Corporation
Gaodianya Jishu/High Voltage Engineering | Year: 2015
In order to study the transition ability of the first ±200 MVA cascaded STATCOM in 500 kV Dongguan Substation under different types of grid failure, we theoretically calculated the 220 kV bus voltage drop caused by the 220 kV or 500 kV line to ground failure in nearby substations. Based on PSCAD/EMTDC simulation platform and the recorded wave file data, the entry and exit of STATCOM transient responses and strategies was verified as well as the reactive power support of the STATCOM when the grid voltage sags. Finally, with the field operation data of the STATCOM in the last two years, we analyzed the response of STATCOM in detail, considering such various typical grid failures as the severe phase-to-phase or phase-to-ground failures. The results show that STATCOM in accordance with design specifications correctly responds within 20 ms, transporting more than 200 MVA transient reactive to the power grid, and it plays an important role in supporting grid voltage stability. © 2015, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
Guangdong Power Grid Corporation | Date: 2010-05-14
A method for vertically grounding and leading down form an inner side of a composite pole tower and pole tower thereof, wherein the method includes the following steps: extending an upper metal cross arm from an extended line of at least one side of a ground wire cross arm which is made of metal, vertically leading down a ground down-leading wire from a distal end of the upper metal cross arm, connecting the ground down-leading wire to the pole tower via a lower metal cross arm at a distance under a lower lead, and grounding the ground down-leading wire along a tower body of the pole tower, wherein when an lower portion of the tower body is a metal pipe, the ground down-leading wire is selectively directly connected to the metal pipe via the lower metal cross arm. The upper metal cross arm and the lower cross arm are able to provide a distance between the ground down-leading wire and the pole tower. The method enhances the ability of bearing lightning flashover, increases the insulating intensity to lightning impact, and prevents burning to composite insulator by power-flow current after lightning flash over. And also the method is easy and simple for application.