In order to supervise the quality of substation project construction more scientifically, comprehensively and objectively, quality supervision system and evaluation indicators of substation construction project were proposed. Based on the analytic hierarchy process with the characteristic of subjective estimation and the entropy weight method with objective quantitative calculation, the combined weight of index was given. Combined with expert evaluation method and fuzzy comprehensive evaluation method respectively, the combination weighting was used to evaluate the quality of substation construction project in order to determine whether the quality of power construction project was qualified or not. Taking the quality supervision of civil engineering in a 220 kV substation construction project in Hunan as an example, compared with the traditional method of quality surveillance, the method based on combined weights reflects the actual situation of engineering construction more objectively and accurately, meanwhile the results are more intuitive.
Along with the development of power grid and increasing reliability of power supply, power quality has become an important factor to the normal power supply of airport. This paper summarized the main network disturbance and their damage to airport power supply system. Through the applicability comparison of the existing simulation software, this paper proposed the quantitative analysis method for the disturbances influence of main network based on advanced digital power system simulator （ADPSS）, which had characteristics of data compatibility and high performance price ratio. Then, a feasible measure was put forward to adjust the voltage dynamically by using static var compensator （SVC）. The researcher results can provide a powerful analysis method for both the operation, control of the existing airport power supply systems and the plan, design of the future ones, which is helpful to keep the airport power supply system safe and reliable.
According to the monitoring need of photovoltaic power station, this paper designed a set of monitoring system scheme for photovoltaic power station, and introduced the architecture of the scheme and the implementation of each function. The scheme's structure is divided into three layers from top to bottom: monitoring background, communication management unit and intelligent sub-station. the communication between monitoring background and intelligent sub-station is through communication manager, in which the real time operation data and state is sent to monitoring background, meanwhile, receives and executes the remote control command form monitoring background, thus can achieve the monitoring needs of entire photovoltaic power station. The practical use results show that this scheme can satisfy the requirement of real-time, stability and reliability of the system.
In order to enhance the design level and performance of substations for the support of management mode reform, as well as the development requirements of intelligence, reliability and environment protection of grid, all the research and development for the new generation smart substation should be based on the design, construction and operating experience of existing smart substation pilot and started with the optimization of top-level design. For this reason, a new design pattern of top-level combined with quality function deployment （QFD） and life cycle costs （LCC） was put forward. Due to the absorption of their advantages and overcoming defects of each other, the top-level design mode of whole-to-division can be used in the substation feasibility study stage and original design stage, and also can be used to guide the development of new generation substation.
From the view of function integration of station level in smart substation, this paper analyzed the requirement of function integration. Based on the current equipment configuration of station level in smart substation, the function integration scheme of data tele-transmission of remote, protection and fault information management subsystem （PRFIS） was proposed. This scheme optimized and integrated the application function of station level, which integrated the remote, PRFIS function in monitoring and control system. It also integratd remote, PRFIS, modeling and graphic information to the dspatch center through the different network port in one datcommunication gateway, which could solve the prolems in station level of multi-system and multi-interface etc, reduce the number of equipment configuration of station level, as well as lower the project cost.
This paper studies the electromagnetic environmental problems of 1 000 kV UHVAC single-circuit transmission lines. Including frequency electric field, frequency magnetic fields, radio interference and audible noise.Combined the existing assessment limit of electromagnetic environmental, the existing calculation methods of electromagnetic environment were summarized. Taking the north of Zhejiang to Fuzhou UHV transmission line as example, this paper calculated the electromagnetic environmental indicators for different wire structures, and recommended the suitable wire type and split numbers for UHVAC single-circuit transmission lines. Finally, the factors affecting the electromagnetic environment analysis, the influence of different factors on the electromagnetic environment effects comparison, the results will play a guiding role on the future UHV single-circuit design.
In order to alleviate the contradiction between power transmission corridors and power transmission capacity in Peral River Delta Area, a number of triple-circuit power transmission lines have been built. Compared with normal double-circuit transmission line, the tower of triple-circuit transmission line is much higher so that it is more likely to be struck by lightning. This paper introduces the calculation method of lightning performance of shielding failure and back flashover by settling a 500 kV triple-circuit transmission lines in Guangdong as an example. The result shows that for 500 kV and above transmission lines, the operating voltage will affect the lightning performance of shielding failure and back flashover. Due to the higher tower of triple-circuit transmission line, the insulation configuration can be different according to the height of cross arm in each layer. When considering the mutual shielding effect of lines, shielding failure rates of all lines at different layers will all decrease. In addition, the shielding failure rates will decrease with the decrease of shielding angles and fielding angles.
The use of fossil fuel cause the resource depletion, air pollution and climate change in the world, which have caused serious impacts on human life and society development. As one of the most important renewable energy, solar energy has got enough attention and scale development. Meanwhile, as a mainstream type of power generation with concentrating solar power technology, solar power tower has been popularized rapidly, whose technology and economic have achieve commercial level, so it has good development prospect. The economic characteristics of solar thermal power tower technology were analyzed, as well as the influence factors on system development parameters, such as the investment and efficiency of solar power plant. Finally, this paper presented the development prospect of solar thermal power tower technology in China, through the analysis of the industry status and development trend of solar energy in China.
In order to evaluate the social and economic benefits of wind power consumption, the level- evaluation model with the optimized index scale was established based on the built evaluation index system, as well as the social and economic benefits of different schemes of wind power consumption were evaluated. Taking the supporting wind power in UHVDC project as example, this paper compared three installed capacities of wind power and obtained the comprehensive evaluation results of social and economic benefits of wind power consumption.
Coking occurs more frequently in the start-up process of circulating fluidized bed boiler （CFBB） with heavy oil ignition over bed. Based on a coking accident during the start-up process of a new CFBB, this paper analyzed the coking reasons that were improper wind-oil ratio, design defect of oil gun shield, incorrect positioning of oil gun, mixed burning time of oil and coal being too long, bad atomization of heavy oil gun, combustion adjustment being no in time in later coal feeding, et al. Finally, according to these reasons, the corresponding preventive measure of coking was put forward, whose effect was obvious: there was no coking in bed material and the region nearby oil gun shield.
In order to speed up the development and construction of wind power in mountainous area, through the combination of theoretical research, example verification, comprehensive analysis, the cause of mountain wind and its characteristics were analyzed, the advantages and disadvantages of wind power development in mountainous area were compared, and the site selection principles and methods of wind farm in mountainous area were studied based on the characteristics of mountain wind resource. The proposed methods and ideas have preferable reference and application value to the reasonable site selection of wind farm, the full use of wind resources and the quick development of wind farm, in mountainous area.
Based on the operation and maintenance of AC/DC hybrid systems in China Southern Power Grid, the statistic analysis was carried out on the multiple DC commutation failures caused by AC fault. Then, the influence of AC fault on the weak links of DC system, such as converter valve, valve cooling system, DC protection, was summarized. From the actual conditions of operation and maintenance, the preliminary improvements were suggested according to the specific effect, which were not only valuable for improving the operation and maintenance capability and insuring the safe and reliable operation of AC/DC system, but also could provide useful references to the design and construction of DC transmission projects in the future.
This paper introduced a new construction technology of breach engineering for 500 kV four-bundle conductor from the aspects of process structure and flow, operation points, etc, in which the isolated span used fabricated stringing in the new breach transmission line and the fabricated stringing was made on the upper air in the original transmission line. The practical engineering application show that this technology has the characteristics of less work on the upper air, high construction efficiency, short outage time, high technical quality, and is the optimal construction scheme for the breach engineering in the high voltage transmission line as well, compared with the conventional technology of breach engineering.
