Table of Content

18 June 2014, Volume 47 Issue 6

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Power System

Analysis on the Electromagnetic Coupling Components of UHV AC Double-Circuit on the Same Tower Transmission Lines

WU Jing-wen, ZHANG Long-wei, CAO Bao-jiang, ZHU Jun, WU Guang-ning, SHI Chao-qun

2014, 47(6):  1-5.  DOI: 10.11930/j.issn.1004-9649.2014.6.1.4

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An electromagnetic coupling model of UHV AC double-circuit on the same tower transmission lines is established according to the structure parameters, and used to calculate the electromagnetic component on the overhaul circuit induced by the operating circuit. The influence is analyzed of the transposition forms, fault type, fault location and coupling ground wires on the electromagnetic coupling component. The analysis indicate that the transmission line transposition and the coupling ground wire erection can effectively reduce the electromagnetic coupling component; the electromagnetic coupling components changes little while different line fault occurs; the electromagnetic coupling components reaches the maximum in value when single-phase ground fault occurs in the line’s two ends.

Experimental Study of the Bending Rigidity at Flange Connection of UHV Electrical Equipment

ZHU Zhu-bing, DAI Ze-bing, LU Zhi-cheng, ZHANG Xue-song, GAO Po

2014, 47(6):  6-6.  DOI: 10.11930/j.issn.1004-9649.2014.6.6.0

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For study the bending rigidity distribution law of the junction between UHV electrical equipment elements and flange, nine typically porcelain bushing elements were selected to do the bending rigidity experimental. Terrible method was used to analyze the experimental data, and then the bending rigidity between porcelain bushing elements and flange were obtained. On this basis, bending rigidity coefficients were calculated, the relationship between bending rigidity coefficients and equipment diameter as well as glue parameters influence factor was analyzed. The results show that when the equipment diameters were less than 300 mm, the bending rigidity coefficients calculated from the measured data were closed to the current code stipulated value of 6.54×10⁷, and the bending rigidity coefficients were decreasing with the increases of equipment diameter. Because the UHV electrical equipment diameters are generally more than 300 mm, so bending rigidity formula stipulated in the current code does not apply to the UHV equipments. New bending rigidity formula applied to the UHV equipments was proposed by fitting analysis of the experimental data. Finally the new bending rigidity formula was proved to be correct by the comparison of simulation and experimental results of three typically UHV electrical equipments.

Dynamic VAR Configuration in a Large Receiving-End Power Grid

TIAN Xin, ZHONG Sheng, WANG Hui-lai, ZHANG Chang, LING Xu

2014, 47(6):  12-17.  DOI: 10.11930/j.issn.1004-9649.2014.6.12.5

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With the constructions of long-distance and large-capacity Ultra High Voltage(UHV) power grids, the receiving-end grid raises an increased standard for voltage stability. Conventional stationary type compensation device is difficult to adapt the requirements of the grid development. Taking the UHV AC grid and Henan 500 kV power grid as an example, the dynamic VAR configuration of the large receiving-end grid in UHV AC and DC interconnection is analyzed by a comprehensive method, which combined with time-domain simulation, V-Q curve and sensitivity analysis. The proposed method provides comprehensive guidance for the configuration of dynamic reactive device.

Improved Redundant Configuration for HVDC Protection System

WANG Chun-cheng

2014, 47(6):  18-21.  DOI: 10.11930/j.issn.1004-9649.2014.6.18.3

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DC protection system is the most important part in a UHVDC/HVDC project, and directly affects the gird safety. Generally, the redundant configuration principle is used in the protection system of actual UHVDC/HVDC projects. The paper discusses the reliabilities of the“two out of three” redundant configuration and the full duplication redundant configuration. Based on the original full duplication redundant configuration, an improved redundant configuration is proposed by improving the action logic. The improved redundant configuration can meet the demand of reducing the false tripping probability.

Investigation on Converter Transformer’s Zero-Sequence Over-Current in HVDC System

LIU Jia-jun, LUO Ming-liang, XU Yu-jie

2014, 47(6):  22-25.  DOI: 10.11930/j.issn.1004-9649.2014.6.22.3

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An investigation is made on the accident of switch trip in Yinchuan Pole 1 converter transformer caused by zero-sequence over-current malfunction of Y₀/Y converter transformer during charging period. It was found that a big difference exists between the zero-sequence current that goes through the Y₀/Y converter transformer neutral point and the one that goes through the Y₀/Δ converter transformer neutral point when the line-side earth fault occurs. A model simulation is made based on the data and wave shape of XJ GROUP’s converter transformer protective device-RTDS used in CSG’s project. It is concluded through synthetic analysis that the zero-sequence over-current protection is not necessary for Y₀/Y converter transformer.

Opening-Reconnecting Plan and Design Between Yu-Xin and Shen-Fu Transmission Line of 220 kV

WANG Mao-cheng, KANG kai, LI Gang, LIU Shu-hua, WANG Xing-han, LIANG Yu

2014, 47(6):  26-30.  DOI: 10.11930/j.issn.1004-9649.2014.6.26.4

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The maximum load of 220 kV Gang-yu substation and 220 kV Xin-gang substation are up to 180 MW and 170 MW respectively. Both substations are serially connected to 220 kV Yu-fu line and Tang-xin line. In case that one of the 220 kV Tang-xin line and Yu-fu lines has been tripped after fault, the rest will run both 220 kV Gang-yu substation and 220 kV Xin-gang substation, and the maximum load may be over 350 MW. The permissible currents of 220 kV Yu-fu line, Tang-xin line are 845 A. As a result, it will cause the current surpassing the permission of the line over 12%. Consequently, the proposal which reconnects the lines after the crisscross lines are unfolded and makes two new lines, one of which is from 220 kV Shen-yu substation to Gang-yu substation and the another is from 220 kV Xin-gang substation to Fu-shan substation is developed. According to this proposal’s computation, there are no negative effects on the power flow, stability under the N-1 operation condition of grid. However, there are numbers of negative influences on grid during the project construction because the 220 kV Shen-fu line, Yu-xin line and Xia-sha line must be cut off simultaneously. For this reason, three new proposals are developed. By technical and economic comparison of the proposals, the proposal of T-link on another side of the one-tower double-circuits is chosen as the optimal one to be applied to supply the peak load in summer.

Study on the Impact of Trees on the Lightning Performance of 10 kV Distribution Lines

WU Yong-cong, CHEN Yuan-dong, LUO Han-wu, SUN Xin, CHEN Shu-bo, HUANG Dao-chun,RUAN Jiang-jun, LIU Huan

2014, 47(6):  31-37.  DOI: 10.11930/j.issn.1004-9649.2014.6.31.6

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The geographical surroundings, line's height and trees along the 10 kV transmission lines have significant impacts on the position and overvoltage of lightning stroke. The lightning position judgment model and overvoltage calculation model are developed based on the concept of striking distance, and used to simulate and evaluate the impact of the trees on the lightning performance of 10 kV distribution line. The result shows that trees with certain height and in a particular location can reduce the times of direct and counter lightning strokes on 10 kV distribution lines, but may increase the risk of lightning induced overvoltage. The impacts of trees on the lightning performance of 10 kV distribution lines vary with their position and height, and it is therefore very important to have a rational management of trees to improve the performance of lightning protection. The study result can provide a reference for lightning protection and vegetation management of 10 kV distribution lines.

A Static Security Analysis Method for Cascading Overload Trips Considering Automatic Device Simulation

WANG Yi, ZHANG Xuan, DONG Yi-feng, WANG Hong-fu, HOU Jun-xian

2014, 47(6):  38-42.  DOI: 10.11930/j.issn.1004-9649.2014.6.38.4

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A static security analysis method for cascading overload trips was proposed, which is based on the post-contingency power flow to analyze the fault flow. If the power flow transferring causes overloads, the overload equipment has to be tripped and the power flow will be calculated again until overloads is eventually eliminated. However, if the fault causes serious consequences such as system islanding, transmission section overload, and power flow not converging, the analysis should be stopped. By evaluating the result of each overload trip, the fault path can be found, which can also help to take precautionary measures to prevent fault propagation. In addition, transmission section limitation analysis and automatic device simulation are taken into account in the calculation process to ensure the correctness of results. Finally, simulation analyses on Guangdong power grid verified the effectiveness and practicability of the proposed method.

A Novel Notch Filter Based Method for Substation Noise Control

JIANG Hong-yu, MA Hong-zhong, JIANG Ning, WANG Chun-ning, LI Kai

2014, 47(6):  43-48.  DOI: 10.11930/j.issn.1004-9649.2014.6.43.5

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For deficiencies of conventional passive methods for substation noise control, a new method of substation noise control which combines artificial neural networks and notch filter is presented in this paper. Firstly, substation noise is theoretically analyzed. Then, two conventional adaptive and active noise control methods, i.e. notch filter based active control method and artificial neural network based active control method, are analyzed. Taking into account of the characteristics of these two methods, an artificial neural network algorithm is used instead of Least Mean Square(LMS) algorithm of notch filter. Finally, these three methods are comparatively evaluated by using actual noise signals from substation. The results show that the proposed method has better stability and suppression effects of substation noise compared with other two conventional methods mentioned.

Comparison of Different Transformer Models and Their Influences on Power Flow of Three-Phase Distribution System

GAO Ya-jing, MIAO Hong-jia, WU Wen-chuan, JU Yun-tao, LI Fei

2014, 47(6):  49-54.  DOI: 10.11930/j.issn.1004-9649.2014.6.49.5

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The establishment of the detailed three-phase transformer model is critical to distribution network analysis. Based on the established model, the interphase magnetic coupling and magnetizing branches influence on the transformer model are analyzed, and estimations of zero-sequence parameters and excitation branch parameters are discussed. Then, based on the IEEE 4-bus distribution test system, the detailed analysis of the power flow calculation is given, which includes the influences of the inter-phase magnetic coupling and magnetizing branches. The results of the test cases show that the interphase magnetic coupling has great impact on the results of three-phase power flow and the excitation loss should not be neglected.

Abnormal Vibration Diagnostic Methods of Transformers Caused by Two Defects

HAO Zhen, LONG Kai-hua, ZHAO Yan-kun, WU Yan-wei, LU Wei

2014, 47(6):  55-60.  DOI: 10.11930/j.issn.1004-9649.2014.6.55.5

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Iron cores and windings are the key components of power transformers, which are also the causes of transformers vibrations. By loosing a fastening device to stimulate abnormal vibration and installing seven sensors in the internal and external of a transformer to research the differences between internal and external data, a 10 kV transformer defect model was established in a laboratory, which can obtain the best sensor arrangement for measuring transformer vibrations. By studying the vibration laws of cores windings respectively at different no-load voltages and load currents, eventually come the methods for the diagnosis of transformer core and winding looses.

Application and Prospect of Rejuvenation Technology of Water-Tree Aged XLPE Cables

YANG Ming-liang, ZHOU Kai, YAO Guang, MA Jian-guo

2014, 47(6):  61-65.  DOI: 10.11930/j.issn.1004-9649.2014.6.61.4

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Water-tree rejuvenation technology provides a novel solution for aged XLPE cables. The paper introduces the current domestic and international applications as well as the future application prospect in China of this technology for rejuvenating the insulation of aged XLPE cables. The fluid composition, the injection technology and the monitoring method are summarized and the problems are pointed out that need to be solved. Based on a case study of cable rejuvenation, the rejuvenation effectiveness is analyzed, which shows that the insulation level of the rejuvenated cables is improved substantially in the short term. It can be concluded that this rejuvenation method is effective for rejuvenating the insulation of the aged cables.

Development of Heat-Resistant Aluminum Alloy Conductor with High Conductivity in Overhead Transmission Line

ZHU Zhi-xiang, HAN Yu, CHEN Xin, CHEN Bao-an, LIU Dong-yu, HAN Ai-zhi

2014, 47(6):  66-69.  DOI: 10.11930/j.issn.1004-9649.2014.6.66.3

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In view of low conductivity and high line loss of heat-resistant aluminum alloy wire compared with those of conventional ACSR in China, a method to improve the conductivity of heat-resistant aluminum alloy conductors is discussed. In this method, the aluminum alloy composition and microstructure are controlled by the micro-alloying effect,combining with the adjustment of zirconium content. The samples of the heat-resistant aluminum alloy wire with high conductivity and low cost were prepared by tests in the laboratory. Moreover, the conductors were successfully verified in continuous casting and rolling production line in a cable factory, which had laid a foundation for production and application of heat-resistant aluminum alloy conductors with high conductivity.

Experimental Research on Temperature Coefficient of Resistance of Energy-Saving Conductors of New Type

WAN Jian-cheng, XI Yong-ping, LIU Long, FENG Liang, LIU Zhen

2014, 47(6):  70-74.  DOI: 10.11930/j.issn.1004-9649.2014.6.70.4

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In this paper, high-temperature oil-bath test bench for temperature coefficients of conductor resistance, which can increase conductor temperature by oil bath, has been designed. The test bench can eliminate the temperature difference between inside and outside and control the conductor temperature accurately, with which the tests for temperature coefficients of the new types of energy-saving conductors, such as high conductivity aluminum conductor steel reinforced, high conductivity aluminum conductor aluminum alloy reinforced and medium strength all aluminum alloy conductor, have been carried out to provide guidance for the engineering design.

Flow Field Simulation of Quadrate Dry-Ice Blasting Nozzle for Substation Insulators

LIU Shi-nian, MA Cun-ren, SU Wei, WEI Zeng-fu

2014, 47(6):  75-79.  DOI: 10.11930/j.issn.1004-9649.2014.6.75.4

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Nozzles are one of the key parts of the dry-ice blasting system thanks to its significant influences of the nozzle structure and the air supersonic free jet flow fields on the cleaning results. The modeling and simulation of the nozzles of different dimensions are conducted using Fluent software. Then the pressure and velocity fields of inner air flow and jet air flow of quadrate nozzles are obtained. The simulation results show that the air jet pressure at the nozzle outlet is much higher than the atmospheric pressure; a supersonic under-expanded jet is formed near the nozzle outlet accompanied by shock wave. Increasing the nozzle size can weaken the air jet velocity attenuation and extend the shock wave transmission distance, which may weaken the stability of the jet flow. Therefore larger scale nozzles should be selected properly to improve the cleaning effect and increase the cleaning area.

Generation Technology

Analysis and Treatment on Abnormal Speed Rise in FCB Test of 660-MW Units

WU Xiao-lin, LUO Yun, LI Yan-jun, MA Tao, LI Rui-dong

2014, 47(6):  80-85.  DOI: 10.11930/j.issn.1004-9649.2014.6.80.5

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In this paper, the system configuration and control logics to realize the FCB function of 660-MW units in Ningxia Ningdong Power Generation Co. Ltd. are introduced, and the analysis on the abnormality of higher speed rise in “island operation” FCB test than that in“convention” FCB test in Unit 1 is conducted. Consequently, the optimization on related control logics and parameters is proposed so as to successfully conduct the subsequent “island operation” FCB test of Unit 2.

Analysis on Hot Bending Vibration Characteristics of 600-MW Subcritical Steam Turbine Unit Rotors

AN Hong-wen, HU San-gao, MA Zhi-yong, TENG Wei, LIU Yi-bing

2014, 47(6):  86-89.  DOI: 10.11930/j.issn.1004-9649.2014.6.86.3

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In this paper, the study is carried out on the abnormal HP-IP rotor vibration with slowly increasing amplitude in one 600-MW subcritical steam-turbo generator. Through the analysis on the vibration characteristics during normal loading operation, startup process and shutdown process, it is concluded that evenly hot deformation occurs on one side of the rotor, which causes eccentricity in the same direction of the original unbalancing mass. The hot deformation may come from the uneven material property rather than the temporary hot deformation caused by uneven local heating. Under this rotor condition, special measures must be taken during shutdown process to prevent turbine damage from severe vibration.

Steam Generator Water Level Control Based on Self-Adaptive Fuzzy-ADRC Logic

XUE Yang, FENG Jian-biao, LIN Jing, ZHANG Jia-dong

2014, 47(6):  90-94.  DOI: 10.11930/j.issn.1004-9649.2014.6.90.4

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To effectively control the water level of steam generators(SG), in this paper, the theoretical analysis on SG water level control objects is conducted and a second-order active disturbances rejection control (ADRC) strategy adopting feedforward and feedback control is proposed to address the“false water level” issue. In combination with the SG water level control under two disturbance conditions, i.e. large disturbance and small disturbance, different self-adaptive fuzzy ADRC controllers are designed. Moreover, simulative comparison is carried out between the new designed controllers and the traditional ADRC controllers, which shows that the self-adaptive fuzzy-ADRC control systems outperform the traditional ADRC control systems.

New Energy

Analysis of Adaptability of Distributed Generation and Region Load Based on Feature Matching Algorithm

CHEN Qiu-nan, WEI Gang, CAI Yang, WU Wan-lu

2014, 47(6):  95-100.  DOI: 10.11930/j.issn.1004-9649.2014.6.95.5

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In order to completely utilize distributed generations (DGs) and ensure stable and economical operation of the loads, a feature matching method based on the analysis of the features of various DGs and region loads is developed. The proposed method mutually adapts DGs and loads by comprehensively considering various facts, in terms of economy, voltage quality, supply reliability and environmental benefits. The method has the ability to easily and quantitatively analyze the adaptability of DGs and region loads, and provide guidance for DGs' selections in different load regions. The results demonstrate that the proposed method is accurate and intuitive and is able to provide a reasonable matching program by taking into account of various conditions and limitations, which can verify the feasibility and practicability of the proposed method.

Analysis of Potential Impacts of Wind Power Generation on Local Climate

WU Zheng-ren, LIU Wei-wei, WANG Song-ling

2014, 47(6):  101-105.  DOI: 10.11930/j.issn.1004-9649.2014.6.101.4

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Wind power generation, which is one of the important technologies to achieve energy structure adjustment, energy saving and emission reduction, can make effective utilization of the wind power. However, the operation of wind turbine may have impacts on natural atmospheric circulation. The existing researches about potential climatic effect of wind farms are firstly reviewed. Then, some physical parameters of the environment related to climate, which may be affected by the wind farms, including surface roughness, turbulent heat transport near surface and height of atmospheric boundary layer are concretely analyzed. The result illustrates that large scale wind farm may have potential impact on the local climate.

Analysis of the Impacts of Multi Wind Region Integration on System Small Signal Stability

ZHOU Zhuan, YAO Xiu-ping, CHANG Xi-qiang, REN Hua

2014, 47(6):  106-110.  DOI: 10.11930/j.issn.1004-9649.2014.6.106.4

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With vigorous development of wind resources, a lot of wind farms have been accessed to power grid, and the access voltage of wind farms have developed from the low voltage level of distribution networks to high voltage level of transmission networks. Because of the growing impacts of wind power generation on the system stability, the small disturbance stability of wind power system cannot be ignored. Since wind farms are interconnected through the major power grid, the impacts of wind power on system stability not only comes from a single wind farm, but also from several wind farms in a wind region or multiple wind farms in several wind regions of the same power grid. An analysis of the output changes of several wind farms in a single wind region and multiple wind farms in several wind regions shows that the impacts of wind farms on system small disturbance stability are mainly represented by oscillation mode and oscillation characteristics of the system. The conclusion is verified through simulation of a typical grid in Xinjiang region with the PSASP program. This study results can provide an important reference for wind power integration, wind farm operation and power system planning.

Clustering Method for DFIG-Based Wind Turbines

LIU Wen-jie, WU Feng, JIN Yu-qing, JU Ping

2014, 47(6):  111-116.  DOI: 10.11930/j.issn.1004-9649.2014.6.111.5

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The clustering of wind turbines is of important significance for improving the accuracy of equivalent wind farm modeling. Therefore, the advantages and disadvantages of the conventional methods were analyzed, based on which, a clustering method according to the dynamical characteristic curves of doubly-fed wind turbines (DFIG) was then proposed. By using this method, the similarities of dynamical characteristic curves of DFIGs under faulty condition are firstly calculated to be the cluster index. Based the calculation, the hierarchical clustering method is used to cluster the wind turbines. Secondly, wind turbine operations can be segmented with the proposed clustering method, and the segmentation way is verified by the simulation. In the final section, the comparisons among different clustering methods are carried out. The result has demonstrated the feasibility of the proposed method.

A Forecasting Method of Short-Term Power Output of Photovoltaic System Based on Wavelet Neural Network Trained by Quasi-Newton Method

YANG Chao-ying, WANG Jin-hao, WANG Shuo, XU Yong-hai, HUANG Hao

2014, 47(6):  117-124.  DOI: 10.11930/j.issn.1004-9649.2014.6.117.7

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The randomness of the power output of a photovoltaic system has an impact on the power grid. So it is needed to strengthen the study of the power output forecasting of photovoltaic systems. In this paper, the short-term forecasting model of PV station power, based on wavelet neural network which is trained by quasi-Newton method, was proposed. The comparison experiments were made for the forecasting model above and the forecasting models based on BP neural network which is trained by quasi-Newton methed, traditional BP algorithm or combining increasing momentum method with varying learning rate method. The experimental results indicate that the short-term forecasting model of PV station power, based on BP neural network with quasi-Newton method, can significantly improve the precision of PV power prediction, and the method based on wavelet neural network with quasi-Newton method did better than that based on BP neural network. Especially, it can significantly improve the precision of PV power prediction under circumstance with low irradiance, such as in daily morning and evening time, rainfalls and snow as well as fluctuating power inflection point.

Energy Conservation and EnvironmentalProtection

Analysis on CO₂ Emission Reduction Potential of Thermal Power Plants Based on Coal Washing Process

FU Zheng-hui, LI Wei, XIE Yu-lei, SUN Guan-zhong, HUANG Kui

2014, 47(6):  125-131.  DOI: 10.11930/j.issn.1004-9649.2014.6.125.6

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A model of CO₂ discharge control aiming at minimizing generating cost is established for thermal power plants in consideration of the total thermal power generation process from coal purchase, coal washing, electricity generation to pollutant disposal. According to the monthly production data, the energy consumption of pollutant treatment and CO₂ emission reduction control of a thermal power plant, the CO₂ emissions in different stages of the generation process are calculated with this model. The scenario analysis approach is adopted to analyze the impacts of different carbon capture technologies on the generating cost and CO₂ emissions. The result shows that the CO₂ emissions of coal-fired generation account for 96.00% of the total CO₂ emissions of the power plant, those of coal washing only account for 0.38% and the CO₂ amount discharged by direct and indirect pollutant disposal account for 3.62% of the total emissions. When the CO₂ capture is performed by using the extraction absorption, membrane process or physical adsorption methods respectively, the CO₂ emissions can be reduced by 71.60%, 76.47% and 86.06% accordingly, but the generation cost will increase by 31.16%, 41.52% and 79.44%.

Economic and Technical Analysis on Secondary Desulfurization of CFB Boilers

WANG Jian-feng, LI Zhuang, LIU Pei-qi, WANG Feng-ji, HE Sheng, ZHU Yue

2014, 47(6):  132-134.  DOI: 10.11930/j.issn.1004-9649.2014.6.132.2

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In this paper, the economic and technical analysis of the secondary desulfurization scheme is conducted on four 480-t/h super-high pressure CFB boilers firing gangue in a power plant of Liaoning Province. Through the comparison between the conventional wet limestone-gypsum flue gas desulfurization technology and the semi-dry flue gas desulfurization technology, it is concluded that secondary desulfurization of CFB boilers that adopts the wet limestone-gypsum flue gas desulfurization technology operates stably and reliably, while on the premise of meeting the requirement of SO2 discharge, adopting the semi-dry flue gas desulfurization technology has the advantages of avoiding chimney corrosion, saving the upgrading cost of dust removal equipment and the cost of operation and maintenance, which is beneficial economically and technically.

Discussion on the Comprehensive Analyzing and Managing System for SCR Denitration Catalyst

LI De-bo, LIAO Yong-jin, XU Qi-sheng

2014, 47(6):  135-139.  DOI: 10.11930/j.issn.1004-9649.2014.6.135.4

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Regarding the present situation of little SCR denitration operation experience and the deficiencies in operation optimization technologies and the related supporting softwares in China, by borrowing the foreign catalyst managing experience, a comprehensive catalyst analyzing and managing system based on the C/S structure is developed with independent intellectual property rights. In this system, a database of SCR catalyst characteristics is established and the functional modules for catalyst updating cycle estimation and updating plan evaluation are developed. With the system, explorations on effective catalyst management are conducted and overall contents, approaches and processes related to the catalyst management are developed so as to narrow the gap between China and other countries in this field and provide guidance for the improvement in the SCR denitration catalyst managing system of power plants.

Study on Technical Framework of Thermal Power Unit Energy-Saving Dispatch

JIANG Xun-han, ZHANG Hui, TIAN Wan-jun, XIA Xiao-bo

2014, 47(6):  140-144.  DOI: 10.11930/j.issn.1004-9649.2014.6.140.4

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With the capability of conducting energy-saving dispatch permitted in domestic power grids, it is necessary to study the key issues related to the energy-saving dispatch, such as, how to acquire the reliable energy consumption data of thermal power units and how to realize the fair unit commitment sequence. Based on the pilot projects in five provinces, AEPRI has carried out a series of coal consumption experiments in the thermal power units of Anhui province and has conducted the analysis on the correlation between unit commitment sequence, coal consumption and pollutant discharge. The framework and operation mechanism of the online power unit monitoring system is proposed and the energy-saving dispatching system for thermal power units is developed. In this dispatching system, the energy consumption index is calculated in the data acquisition server of each unit, and the results are all uploaded to the central server. The configuration saves the hardware investment and network resources significantly. The system reliability also gets improved. The study also indicates that a scientific and reasonable technical roadmap should be developed for the dispatching system and its operation mechanism. The dispatching system may take on the role in energy-saving and emission reduction only when the existing issues are systematically analyzed and solved. Therefore, further studies on this topic are necessary.

Comprehensive Evaluation of Energy Saving and Emission Reducing Performances of Thermal Power Enterprises Based on the Entire-Array-Polygon Indictor Model

ZHANG Lei, LI Na-na, ZHAO Hui-ru, YANG Kun

2014, 47(6):  145-150.  DOI: 10.11930/j.issn.1004-9649.2014.6.145.5

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Effectiveness of thermal energy saving and pollutant reducing determines the overall goals of Chinese energy saving and pollutant reducing policy. Based on the requirements of relevant national policies, a comprehensive index system of thermal energy saving and pollutant reducing is established from energy resource consumption, resource utilization, pollutant emissions and business efficiency. In this paper, a method based on the entire-array-polygon indictor evaluation model is developed to evaluate the performance dynamically, which can overcome the influences of subjective factors. In final section of this paper, taking a thermal power plant as an example, an evaluation on its energy saving and pollutants reduction effect is performed. The result shows that the overall performance of this plant's energy reduction index is upward with seasonal fluctuations and the performance of the technological transformation projects is effective. The evaluation method is feasible.

Information and Communication

Research and Application of FlexGrid Standard

LI Jiang-sheng, WANG Hui, LI Tie-chen, SUN Yi, LI Bin

2014, 47(6):  151-156.  DOI: 10.11930/j.issn.1004-9649.2014.6.151.5

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Due to the explosive growth of power enterprises’ data traffic, the bandwidth bottle-neck problem of the backbone network is becoming more serious. In order to solve this problem, the FlexGrid technology application in power communication networks was investigated from the aspects of spectrum management methods, cross-connect equipment, mixing wire-speed transmission and control plane, on the basis of the service requirements analysis of the State Grid large-capacity OTN (optical transport network) backbone network. The proposed application mode can provide finer granularity size and dynamic adjustment capabilities. A spectrum management approach was proposed by using different modulation order regulations under several constraint conditions, which can effectively improve the performance of poor flexibility, low bandwidth utilization efficiency of existing transport network due to fixed bandwidth allocation.

Research and Application of Testing System for Advanced Application Function in Smart Substations

ZHAO Yong, ZHANG Dao-jie, CHENG Hong-wei, FAN Dong-feng, SHI Guang, HAN Wei, MA Wei-dong, HU Ming-xin, SUN Yu-feng

2014, 47(6):  157-160.  DOI: 10.11930/j.issn.1004-9649.2014.6.157.3

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To solve the outstanding problems of advanced applications in smart substations, the scheme of advanced application test, which is based on template technology, is presented in this paper. In view of the difficulties of smart substation simulation, rapid modeling method is proposed for the smart equipment. In view of the key issues of the evaluation system, standardized templates are established for the business data by using the templates and different business categories. Finally, combined with the intelligent alarm business, the application of the templates is developed and verified.