Integrated Intelligent Energy

Analysis on generators paralleling impact current and setting of synchronization blocking relay

JU Zhenghao

2011, 33(9): 1-3.

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For the quasisynchronization paralleling of the generator with the system, some conditions, such as voltage, frequency, phase and etc., must be satisfied seriously. Considering that the voltage difference, the phase difference and the frequency difference are existed, the characteristics of the impact current and the influence of the impact current on the generator and the system were analyzed. Based on the result of above analysis and the related parameters of the automatic quasisynchronization device and the closing breaker, aiming at a practical example, the setting calculation of the blocking angle of the synchronization blocking relay was carried out.

Evaluation of reliability of distribution network including intermittent distributed generation

HUANG Hua;YE Meng

2011, 33(9): 4-6.

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The intelligent power grid is the development direction of modern power grid; and it requires the future distribution network to be able to accept distributed generations (DG) freely. However, the DG (especially the intermittent renewable energy source distributed generation) has characteristics of dispersion and random variation, to access of mass of DG into distribution network will influence greatly on safe and stable operation of the system. A new evaluation method for comprehensively and accurately evaluating the reliability of the distribution network with DG, which includes wind farms, photovoltaic power stations and others, was put forward. The reliability model of intermittent distributed generation (IDG) was established. The associated matrix was imported to deal with the partition of the solitary island. The reliability evaluation method for distribution network with IDG was introduced. The influence mechanism of DG on the reliability of the distribution network was analyzed by examples, which provides certain reference for expansion plan of distribution network with multiple complementary energy sources.

Analysis on influence of distributed power generation plants connecting into distribution line on relay protection

HE Yanli

2011, 33(9): 7-9.

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The advantages and disadvantages of the distributed power generation technology were introduced. The distributed power generation plants and their influence on the relay protection were analyzed. The influence of the distributed power generation plants connecting into the distribution line on the sensitivity of the current protection was analyzed, and the influence of the distributed power generation plants connecting into the radiation pattern distribution system on the current protection between phases was analyzed too, providing a reference for the persons of same profession.
Key words:distributed power generation plant; power distribution line; relay protection; influence

Application of curved tube pulling technology in 220kV cable crossingriver laying project

LI Lu;QIU Changsheng;ZHAO Dongxu;WANG Lina

2011, 33(9): 10-12.

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In development of the city underground cable laying, the trenchless technologies, such as the curved tube pulling technology, due to their characteristics of the little influence on the environment, the simple process and the wide usability in laying the line passing through long distance obstacles, are used more and more widely. Combining with the practical situation of curved tube pulling construction project, the principle of the construction and the matters needing attention in the construction were analyzed. The jacking force data of the site jacking machinery and the field settlement data were monitored and analyzed. The result shows that by monitoring and dynamical feedback, the curved tube pulling construction scheme was verified effectively; and the favorable effects were obtained. The scheme provides certain reference for similar curved tube pulling construction projects.

Application of classical controller in automatic generation control system of regional interconnected power grid

DONG Guowei;YANG Ping

2011, 33(9): 13-15.

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Taking the interconnected power grid of two regions as example, the control performance of several classical controllers used in automatic generation control system was introduced. One percent of single step load disturbance was added into region No.1, the frequency deviation inside regions, the power deviation in tie line and the input signal of governor were analyzed, providing a reference for application.

Analysis on reliability of water level protection system of deaerator

LI Li;XIAO Changge

2011, 33(9): 16-20.

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By using the Markov model, the reliability model of deaerator water level protection system was established. The influences of system structure, the diagnosis coverage rate, the common factors and others on the reliability of deaerator water level protection system were analyzed. The simulation data show that to adopt multiple redundant system structure, to increase the system diagnosis coverage rate and to reduce the influence of the system common factors can increase the MTTF of whole system and decrease the system failure rate.

Design of automatic monitoring system for electrostatic precipitator based on iFix

ZHANG Jian;LI Yiqiong;YAN Rongmin

2011, 33(9): 21-23.

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In order to enhance the maintainability of the electrostatic precipitator monitoring system and to improve friendliness of the manmachine interface, an electrostatic precipitator automatic monitoring system based on the general configuration software iFix was designed. The software structure and the hardware structure of the monitoring system, the key technologies of the design and the system functions were introduced. The system had been applied in multiple electrostatic precipitators, which are new built or reformed; the site equipments and the systems are operating well.

Installation and debugging of hydraulic system of airpressure sink cabinet

WANG Qi;YANG Yong;FANG Donglin

2011, 33(9): 24-26.

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The new airpressure sink cabinet manufactured by Gezhouba Group Machinery and Ship Company Limited of China is the first engineering equipment used in overhauling of dam of hydropower station. The structure and the theory of the airpressure sink cabinet were introduced. The problems occurred during installation and debugging of the hydraulic system of the airpressure sink cabinet and treatment method were expounded, providing a reference for large hydropower stations in installation and debugging of airpressure sink cabinet.

Three dimensional parametric modeling for trolley frame with variable structure based on ObjectARX

WANG Kang;YU Leimo;NIU Yue

2011, 33(9): 27-30.

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The software AutoCAD2004 was introduced. On the Visual Studio 2003 platform, using the visual C++ language, an ObjectARX program had been written, and a 3dimensional parametric modeling had been accomplished. Taking the trolley frame of crane as example, a fast design system for trolley frame of crane with variable structure had been developed; and the working efficiency of the designers can be improved by using this system.

Analysis on supercritical technology of large circulating fluidized bed boiler and difficult points in its control

CHANG Taihua;XU Hao;GAO Mingming

2011, 33(9): 31-37.

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The characteristics of CFB boiler in fitting to the supercritical parameters, the difficult points of automatic control technology and the key technologies were analyzed. The present development of supercritical CFB boiler at home and abroad was introduced. The authors consider that the good development prospect of the supercritical CFB boiler in our country is expectable, but the problem of automatic control under parameters strong coupling must be solved firstly.

Analysis on problems in ultrasonic testing of buttjointed seam of smalldiameter tube

YU Daoguo

2011, 33(9): 34-37.

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Some technical difficulties encountered in ultrasonic testing site of smalldiameter tube were introduced. Some problems, such as the refraction angle of the probe, the test block, the test compensation amount, the defect judgement and others, were researched and analyzed. Some matters needing attention in ultrasonic flaw detection of smalldiameter tube were pointed out.

Grounding system of 660MW ultra supercritical thermal power plant and selection of its protection method

CHEN Hongwei

2011, 33(9): 38-41.

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The category of grounding system of 660MW ultra supercritical thermal power plant was introduced. Several important problems related with the grounding system of thermal power plant were expounded. Based on this, the protection of the grounding system was discussed emphatically, so as to find the more economical and more practical protection method of the grounding system.

Analysis on reason of vibration of 316 type steam turbine and solution

ZENG Xinhua

2011, 33(9): 42-43.

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Aiming at the vibration of the 316 type steam turbine occurred in its operation, according to the theory and practical experience, the reason of the vibration was analyzed. Combining with the characteristics of site equipments, some feasible measures were adopted, and the vibration of the unit was eliminated.
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Analysis and treatment of common faults of boiler burner directly fed by coal mine gas

NIU Guoliang

2011, 33(9): 44-47.

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The boiler burners burning the coal mine gas, which is extracted from the coal mine and is not treated, are restricted by the gas composition and its volume fraction, the gas pressure, the gas moisture and other factors and often go wrong; and this may cause the burner stall and outage and greatly influences on unit normal operation. Common faults analysis and judgement and the fault elimination method for the burner were summarized. The fault rate was decreased greatly, and the boiler operation became normal.

Analysis on reason of lower pH value of boiler water and solution

YIN Pisong;GAO Yaqiong

2011, 33(9): 48-49.

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The pH value of the fed water for the 240t/h CFB boiler was normal, but the pH value of the boiler water was lower. The reason of the lower pH value of the boiler water was analyzed. Aiming at the factors causing the pH value of the boiler water to be lower, a solution was put forward. The tube crack accident of water wall of the boiler was prevented; and safe and stable operation of the unit was ensured.

Analysis on fault of rotary speed control of 300MW unit steam turbine and treatment measures

LI Xingzhao;SONG Guofeng;CHEN Shuqin;HAI Guangxing

2011, 33(9): 50-52.

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In Gongyi Yulian Power Plant, when the 300MW unit turbine was latched on again during its coasting operation after it was shutdown, the opening of the adjust gate was increased suddenly and rapidly; the rotate speed of the turbine was increased sharply; and the overspeed protection of the turbine was acted. The problems mentioned above were analyzed and treated, and favorable effect was obtained.

Application of excavated vertical column foundation in design and construction of high voltage transmission line in PanzhihuaXichang area

ZHANG Guobin;TAN Yunsheng

2011, 33(9): 53-55.

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The excavated vertical column foundation is often used in PanzhihuaXichang area. The calculation methods, the economical and technical norms, the construction and the operation of the excavated vertical column foundation and the common flexible foundation were compared and analyzed. It was proved that the excavated vertical column foundation has better economical efficiency and practicality. So the excavated vertical column foundation is recommended in construction of high voltage transmission line in PanzhihuaXichang area.

Control strategy of high voltage frequency conversion for induced draft fan and its optimization

GUO Bochun;XIAO Sheng

2011, 33(9): 56-58.

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Taking the high voltage frequency conversion reformation for induced draft fan of the 600W unit in Sichuan Guang'an Power Generation Company Limited as example, starting form the control angle, the reformation scheme, the control strategy and the optimization method of the control strategy were expounded. The importance of design of advanced and rational control strategy in high voltage frequency conversion reformation of the induced draft fan was demonstrated.

Energysaving reformation of dualspeed motor of water circulating pump

BAO Jinchun

2011, 33(9): 59-60.

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The application principle of the dualspeed motor was introduced. Based on this, the necessity of motor reformation was expounded. The reformation result was compared, and the result shows that the reformation of the dualspeed motor for water circulating pump has features of small investment and quick returns, and can realize the purposes of water regulation，energy conservation and lower consumption.

Analysis on turntoturn short circuit and grounding faults of 600MW generator rotor

LIU Caibi

2011, 33(9): 61-64.

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Using the functional relationship between the internal electromotive force E of generator and the excitation current If of the rotor, the criterions of the generator rotor turntoturn short circuit and the rotor grounding fault were analyzed and summarized. The data of the generator in 600MW unit of Sichuan Guang'an Power Generation Company Limited before and after the rotor turntoturn short circuit and rotor grounding fault were analyzed, and the rotor was pulled out and inspected. The data analysis and practical inspection prove the correctness of the criterions. The measures for preventing the rotor grounding fault were put forward, which are useful for enhancing the fault analysis ability of the operators.

Improvement of oxygen compensation control strategy for boiler No.2 in Shajiao C Power Plant

BAI Fuchang;

2011, 33(9): 65-66.

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The original oxygen compensation control strategy for boiler No.2 in Shajiao C Power Plant can not adapt to the load variation and the coal grad variation, which increases the load of the fan. According to the coal grade, the mile combination and the load increasing or decreasing, a selfadoptive control scheme of oxygen compensation was put forward. In practical application of the scheme, favorable effect was obtained.

Diagnosis method for fault of dissolved gas in transformer oil

LIU Dahai;HAN Dong;ZHANG Hang;ZHANG Cong;WANG Zhenyue

2011, 33(9): 67-68.

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In order to enhance the accuracy of analysis and diagnosis on dissolved features gas in transformer oil, combining with fuzzy theory and advanced genetic algorithm, the fuzzy processing on the gas ratio boundary and fault codes of the improved IEC three ratio method was carried out; then the fuzzy inference was used to obtain the fault diagnosis result. This method can reduce the influence of other interfering gases on the diagnosis result greatly, enhance the accuracy of chromatographic analysis of the dissolved gas in transformer oil, and enhance the operation reliability of the transformer insulating oil.

Analysis on reasons of explosion of current transformer on bus coupler segment in weakinfeed side of a substation

ZOU Qiqun;SHU Yishi;YU Peijie

2011, 33(9): 69-71.

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An explosion accident of current transformer on bus coupler segment in weekinfeed side of a 220kV substation was introduced. Combining with the operation mode of the system before the accident, the phenomenon of the accident and the actions of the related protection and switches, according to the principle of the protection device, several key protection actions in the accident process were analyzed. The acting principle and acting process of the optical fiber differential protection and the optical fiber distance protection in weakinfeed line were analyzed emphatically. Combining with the characteristics of the weakinfeed line, some suggestions on its protection configuration and its secondary circuit design were put forward.

Experimental Research on operation optimization of desulphurization system of 600MW unit

NIE Pengfei;MA Lei;ZHANG Peng

2011, 33(9): 72-76.

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The experiences of operation optimization of limestonegypsum wet FGD system of 2×600MW unit in Hebei Datang International Wangtan Power Generation Company Limited were introduced. The concrete measures of operation optimization were given. Based on experiment and the statistical analysis, the better operation mode of desulphurization system was obtained.

Operation optimization of limestone wet desulphurization system

WANG Jianfeng

2011, 33(9): 77-80.

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The factors influencing on the performance of limestone wet desulphurization system were analyzed. Taking the desulphurization system of Datang International Douhe Power Plant as example, the strategy of operation optimization of desulphurization system was put forward; and the important function of the laboratory test and analysis in operation optimization of desulphurization system and its application method were pointed out.

Technical analysis on use of carbide slag as desulphurizing agent in wet FGD system

YAN Xinrong

2011, 33(9): 81-84.

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The feasibility of using the carbide slag as desulphurizing agent, instead of the limestone powder, in limestonegypsum wet FGD system of thermal power plant was analyzed. The necessity of the original desulphurization system reformation was expounded. The measures for ensuring safe, economical and stable operation of the equipment system were put forward, which can be used as reference for the limestonegypsum wet desulphurization system when it will be reformed to use the carbide slag as desulphurizing agent in this system.

Analysis on clean energy development policy and current situation of China

ZHAO Shengguo

2011, 33(9): 85-87.

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The current economic situation and the energy situation of China were introduced. The relevant policies, which were enacted by the state for promoting the clean energy development, were expounded. The adjustment of future energy structure was analyzed properly, providing reference for people in the industry.

Influence of low voltage ride through in wind power generation system on electric power quality of power grid

ZHANG Weijun;MAO Yu

2011, 33(9): 88-91.

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The low voltage ride through technology of the wind power generation system was introduced. The Influence of wind power generation system on the electric power quality of the power grid during the low voltage ride through process was analyzed. A method was put forward, in which the protection circuit unit is used for improving the wind power generation system and enhancing the electric power quality of the power grid when the low voltage ride through occurred. By software simulation, the rationality and validity of the method were proved.

Application of Kalman Hill Climbing Control Algorithm in yaw control system of wind power generation unit

GU Luxiang;LE Xiufan;YANG Yukun;LI Shanshan

2011, 33(9): 92-94.

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In some wind farms, the wind power generator may aim the wind direction no so accurately, and the wind power generators located in leeward of other wind generators are impacted by air flow of other wind power generators and can not aim the wind direction exactly. Aiming at above-mentioned problems, the KHC algorithm, a new control algorithm, in which the optimized Karman filtering is combined with hill climbing method, was put forward. The core contents of the algorithm are that using the power detection to aim the wind direction and contral high accurately， and using the Kalman filtering to predict the wind vector to avoid the frequent and fatigue action of the yaw mechanism and the interferences. By simulation analysis, the feasibility of the algorithm was verified; and the wind power generation efficiency had been increased greatly.

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