Abstract:According to SGCC's general plan of backbone UHV grid, UHV grid will be constructed in JiangSu power grid around 2012,which has great and far reaching significance to JiangSu power system. The impacts of the UHV grid on the operating and planning of JiangSu power system are viewed in this paper. And the paper emphatically analyzes the influences of the UHV Grid on the power flow,short circuit current,stability of JiangSu power system,and the influences of the UHV grid to the grid structure planning, supply source connecting mode, coastal wind power station development of JiangSu power system are also analyzed.

Abstract:An improved multi-objective NSGA-Ⅱ algorithm is presented in this paper, which can find the well-distributed Pareto optimal solutions by using an improved crowding-distance truncation operator. Furthermore, this algorithm is applied to optimize and construct the nonlinear PID controller. The simulation results of boil superheated steam temperature control system indicate that the dynamic and static performances of the system are increased at a certain degree, and control quality is improved greatly.

Abstract:Since the IEC 61850 doses not particularize how to communicate in substation station level dual-network, several solutions have been proposed by the manufacturers in substation engineering. Based on IEC 61850 duplicated star topology network architecture in station level, this paper introduces some technical details of several solutions, analyzes and compares the advantages and disadvantages of them,also gives the application conditions of these solutions. Considering the reliability and performance, a practicable solution about station level dual-network communication is proposed.

Abstract:The development of plantwide control is reviewed in the paper from the aspects of theory and application, and the theory, methods and design of the plantwide control are also introduced. On this basis, the feasibility and superiority of the application of plantwide control as well as its application examples are described and introduced.

Abstract:Abnormal phenomena of voltage caused by the poor contact of insulation connectors in 10 kV transmission lines is introduced in the paper, and the reasons for the phenomena are also analyzed .The paper can provide a reference for the handling of similar problems.

Abstract:In the low-current grounding power system, asymmetry parameters could cause offset of the neutral point voltage, and even produce virtual earth phenomenon, which is similar to a single-phase grounding fault. Moreover, when the system capacitance to earth is changed, the charging change redistributes to achieve another new steady state. In this electromagnetic transient process, the current path to earth forms through PT and arc suppression coils. The direct current component leads to the PT saturation and voltage abnormality. Based on principles of these two aspects, this paper introduces an abnormal voltage accident caused by poor contact of insulating clamp on 10 kV bus. Reasons of the phenomenon are analyzed as well, which will have a certain referential significance to similar cases in the power dispatch.

Abstract:This paper deduces the calculation formulas of induction voltage current, as well as the induction and capacitance between lines. The factors affecting induction voltage and current are analyzed. The induction voltage and current of a 500 kV double-circuit transmission line is calculated using electromagnetic transient simulation. Results of simulation, theory calculation are consistent with scene measurement.

Abstract:According to one explosion accident of 110 kV cable termination, the investigation and analysis are carried out. Through anatomy analysis to the termination, the poor sealing technology adopted by the production of the cable termination is considered to be the main reason for the accident. Measures are proposed to avoid the recurrence of similar accidents.

Abstract:With the expanding of the smart grid construction, the technology of Intelligent Power Meter field has been continuously expanding. Thus developing put forward many new technical requirements, which traditional DL/T 645 protocol cannot effectively solve. This paper introduces the application of IEC 62056 in domestic, analysis and compares the differences between IEC 62056 communication protocol with DL/T 645 and IEC 61850. Some problems in actual application of IEC 62056 standard are summarized through thus research of convert DL/T 645 to IEC 62056 protocol model、IEC 62056 consistency test tools、IEC 62056 Meter Reading System and so on,

Abstract:The design principles and implementations of a report system based on J2EE are presented in this paper. The report system uses JAVA language to realize cross platform operation. The design style of the system is similar to Excel spreadsheet and it is compatible with Excel. Meanwhile, the system makes use of several technologies such as three-tier structure, object-oriented data encapsulation to hold a good scalability. According to characteristics of the electricity meter system, the report system can generate various forms of real-time statistics, which provides data analysis function to make statistical computation. This report system has already been widely used in the TMR system.

Abstract:the Automatic Switched Optical Network (ASON) technology and its characteristics are introduced .the states and the problems existing in Wuxi power communication-net are analyzed. According to the status and the trend of Wuxi power communication-net, this paper propose the feasibility of application of ASON technology .finally simply expositions of the ASON network plan for Wuxi power communication-net.

Abstract:Based on the analysis of the principle and circuit structure of stand-by system, the voltage variation of the low-voltage side at the condition that the high-voltage side loses power supply is discussed in the paper. Focusing on the problems existing in stand-by system, measures for the improvement of the system are proposed. The improved stand-by circuit can be operated successfully when the circuit of high-voltage side is interrupted at any single phase. The reliability of self-demand system is guaranteed.

Abstract:The synchronization of database is an indispensable and important part in different implementation fields. The process of database synchronization contains data extract and data load. Because of numerous sheets, short acquisition cycle and large capacity of power data, total synchronization is not suitable. Thus, data extract and load based on increment is studied in this paper.

Abstract:Combination of the present application (research) situation in wind power monitoring field, this paper deduces the import to develop general integrated monitoring system of wind farm, the features and main functions of the integrated monitoring system of NS2000W wind farm are proposed, finally by analysis of the specific example of wind power monitoring, this paper proposes the overall solution of the wind power monitoring system.

Abstract:Considering the rapidity of differential action, TA breaking must be distinguished before differential action in order to achieve the goal of blocking differential protection. The recognition principle of TA breaking is introduced in the paper. Problems existing in different running environments are pointed out, and solutions ensuring the rapid recognition of TA breaking and in-time trip in the case of a failure are proposed. Based on the analysis of the principle, logic diagram for realization is presented in the paper, and practice has proved it to be effective.

Abstract:This paper introduces the system structure and design principles of the digitization technology in retrofit of 110kV TongCun Substation, analyzes the main technical features of digitalization substation, some issues needed pay attention to in the construction、acceptance and operational check are put forward. Through analyzing the model and implementation process of the transformation of TongCun digital transformer substation, this paper gives references for digital substation building in the future.

Abstract:The harmonic pollution is a common problem in power network. Thoughts and methods of locating harmonic sources are summarized in this paper. Then, evaluating principles and process of consumer connecting to public grid, as well as project cases are presented.

Abstract:This paper introduces the application of time synchronization schemes in digital substation and compares the technical characteristics of them. Aim to meet high-accuracy synchronization requirement of new digital substation, a time synchronization system based on IEEE 1588 which can support sub-microsecond level of accuracy is put forward. The theory of IEEE 1588 is expatiated at the same time. According to IEEE 1588, this paper expounds three application schemes on time synchronization network in substation, and analyzes the limits of IEEE 1588 applied to time synchronization between substations. Lastly, an optimal configuration synchronization network is proposed, on the basis of integrating the GPS and IEEE 1588 technology.

Abstract:The backup modes and specific types of inter-backup system for central control system and district-level dispatch system are introduced. The application conditions, maintenance method as well as the advantages and disadvantages for different inter-backup system are analyzed. The research on inter-backup system for central control system and district-level dispatch system is still at exploring stage in China. The whole structure of this system is simple and reliable. Through the inter-backup between central control system and district-level dispatch system, the resources of central control system and district-level dispatch system are used furthest, and the security is improved. The system will be applied broadly in future.

Abstract:According to the electrostatic field theory, the power frequency electric field intensity and the magnetic induction intensity produced by different phase position of high voltage transmission line are calculated in this paper. Based on the varying degrees of environmental influence, this article also puts forward the concept of the optimal lay form of phase-sequence.

Abstract:Focusing on the abnormal automatic reclosing of MV and LV microcomputer-based line protection in power system, two kinds of exceptional automatic reclosing instances on site are introduced in the paper. The charge condition of line computer protection device's reclosing and the main reasons for abnormal automatic reclosing are analyzed. Solutions to the problem are proposed at last.

Abstract:A new model for the efficiency calculation of boilers is introduced in the paper, and the research method for the real-time monitoring model of energy consumption based on the new model is also analyzed. The fundamental philosophy of on-line intelligent diagnosis of energy consumption in coal-fired unit is introduced at last.

Abstract:Focusing on the main problems associated with the energy saving and emission reduction in the design process of thermal process automation, some aspects including strengthening the security controls of thermal power equipments, increasing operation economy, improving the reliability of energy saving and emission reduction technology, developing and using new energy saving and emission reduction Instrumentations and invisible factors in the design process of thermal process automation are analyzed in the paper.

Abstract:Taking No.3 unit in Wangting Power Plant as an example, the overall self-startup control strategy of 660 MW ultra-supercritical steam turbines introduced from Siemens by STC is introduced in the paper. The self-startup controlling step of DEH as well as X-criteria, Y-criteria and calculation of control margin is described in detail. It can provide a reference for self-startup control design of same type units at home.

Abstract:The reasons for the generation of condensate depression in large power plant are analyzed in the paper. With the application of matrix analysis method and partial differential theory, the impact of the changes of condensate depression in an imported type 600 MW plant are analyzed quantitatively. Some measures to reduce the condensate depression in the aspects of operation and maintenance are proposed to supply a new approach for the energy saving and emission reduction as well as the analysis of thermal economy in thermal power plant.

Abstract:In the first stage project of 3 × 600 MW units in a power plant, the economizer ash handling system has been removed from the boiler system supplied by the former boiler factory. Some problems have appeared constantly since the units were put into operation. We decide to add the ash handling system to the boiler system after making some surveys. It conveys the ash to the flue of electrostatic precipitator inlet directly and then to the ash silo through electrostatic precipitator ash handling system instead of transporting the ash to the ash silo or electrostatic precipitator area. At present, three sets of ash handling systems reconstructed by this factory have been put into operation normally, and the safety and economic performance have been improved greatly

Abstract:This paper introduces the basic principles of vortex flow meter and analyzes the impact of flow field's shape change on equipment constant parameters. Meanwhile, effects to the equipment caused by upstream fluid and obstacles are presented.

Abstract:Since more than 60% of the total power load is the motor load, cutting down the energy consumption of motors has been one of the important means for energy saving. As the main components of high-voltage motor load, the load of electric fans and pumps are described in detail with practical examples in the paper. The measures based on the internal feedback chop-wave cascade speed-regulation system as well as the significant economic effect are also introduced.