Advanced Materials Research Vols. 960-961

Abstract: We took 600 MW sub critical unit of Taishan power plant as the research object and modeled. Analyzed the thermodynamic system by exergy method. Got the amount of exergy loss, the exergy efficiency of regenerative heater and so on. Found out the distribution of different kinds of exergy loss in the power plant with giving out the scientific and reasonable explanation and the weak point. Then increased the efficiency of thermal system by adding external steam coolers for high pressure heaters.

Abstract: Economic diagnosis of thermal power units is to determine the economy of its operating parameters and operating modes by quantitative and qualitative analysis, which is significant to economic operation and energy saving of power plant. On the basis of equivalent enthalpy drop method and the theory of variable conditions, the economic diagnosis model of operating parameters was established. As main steam temperature and main steam pressure for example, economic diagnosis of a 660MW supercritical steam turbine unit was performed. The result demonstrates that improving the main steam temperature or main steam pressure can reduce heat consumption of the unit. The essence of improving the initial steam parameters is to improve the average temperature of the steam cycle endothermic process, thus improving the circulation efficiency and reducing heat consumption. The economic impact of main steam temperature is up to 0.61g/(kW·h), while which of main steam pressure is little. Therefore, by increasing the initial steam parameters, especially the main steam temperature, to improve the economy of the entire power plant is the main way to enhance the efficiency of power plant in the current.

Abstract: In the process of practical application of state estimation in the actual dispatching system, there are many factors that affect the accuracy of state estimation results. This paper based on the simulation platform of the dispatching system and used the operation data of the actual power grid to simulate the operation of power grid, then analyzed the various factors that have influence on the results of state estimation, which provided effective technical support for practical application of state estimation.

Abstract: Microgrid can be applied in different locations, relative to traditional power technology. It can improve the reliability of users of electricity and power system operation. Distributed power in microgrid needs real-time and multi-objective optimization management. This paper discusses functions and structure of microgrid energy management system(MGEMS) when connected with the main grid. Problems in long-term and short-term energy management of microgrid are discussed. From the point of view of the software platform, the system structure of MGEMS software are proposed. On this basis, this paper discusses the way to construct modules of MGEMS and their functions.

Abstract: In view of the lack of comprehensive and quantitative evaluation means for transmission network planning currently, a comprehensive assessment index system adapted to the characteristics of the transmission network planning is proposed, including 6 strategic layer indices (safety and reliability, economic efficiency, flexibility and coordination, smart and green, controllable risk and social benefits), 16 target layer indices and 57 operating layer indices. And the assessment standard for each index is determined to provide objective, comprehensive and systematic evaluation of transmission network planning alternatives as well as prepare for realization of the comprehensive evaluation of transmission network planning.

Abstract: In order to identify weaknesses in distribution network planning alternatives, providing a scientific basis for grid investment decisions, effective and comprehensive evaluation is needed. According to the related principles and objectives, this paper establishes a comprehensive evaluation index system based on hierarchy. This system is guided by the long-term development strategy of China southern power grid, including six strategic layer indices as safety and reliability, economic efficiency, coordination and flexible, smart and green, controllable risk and social benefits. The meaning and classification of every index is listed in details. According to different technical characteristics of every index different fuzzy membership functions are structured. Furthermore, in accordance with the relevant guidelines and specifications, this paper gives specific values of the membership function parameters to achieve standardization of indexes of different dimensions, laying the foundation for a comprehensive assessment.

Abstract: In order to study out the incidence relationship among security, efficiency and adequacy of Electrical Power Grid, a novel analyze model considering grid evolution and a relationship evaluation method is proposed in this paper. The model incorporates in fast dynamic and slow evolution. The former is based on an improved OPA model with low frequency load shedding control and the outage risk calculation. The latter is consists of increasing load, up-grading and constructing equipments including power plants, transformers and transmission lines, Using the model simulation the power grid development process. Based on the model, the customer outage risk caused by cascading failure is obtained in several times, the efficiency index and grid scale index are solved at the same times, these data are the basic data for analyze the incidence relationship among the security, efficiency and adequacy of electrical power grid. In this paper, the power grid of Kaifeng City in Henan Province, of China is used to simulate the evolution. The results show that the relationship among the security, efficiency and adequacy of grid is as exponential function, and a reasonable range of efficiency and adequacy of grid are proposed.

Abstract: The Internet and the gradual implementation of the continuous power grid market in recent years make the power system more complex under different operating environment. Safe and stable operation of power grids have become increasingly important . With the rapidf development of the grid and constant innovation, safe and stable operation also has a new requirement , because the rapid development of the power system brings more This paper analyzes the causes of blackouts and reviews security of the power system stability problems related to measures on the security and stability of the power system operation .

Abstract: Transmission line gallopingis self-excited vibration of iced conductor with low frequency and largeamplitude, the countries almost all over the world have occurred transmissionline galloping, which caused a great economic loss. Drawing the effectivedistribution map for galloping plays an important role in guiding theanti-galloping design, the key of this work is to establish a scientific methodfor galloping region division. In this paper, several methods for gallopingregion division were introduced: frequency method, coefficient method andmeteorological-geographical method. This paper also compared the applicabilityof various methods and their advantages and disadvantages. It shows that themeteorological-geographical method is the best choice for us to dividegalloping region at the present time. However, in the practical application, weshould take all the applicability of the three methods into consideration toget a reasonable division for galloping region.

Abstract: In order to meet the developing demand of the new generation of data center, and to better satisfy the need of the smart grid, we introduce the OpenFlow-based SDN technology to electric power data center. Because there are many switches in electric power data center, it requires the use of a distributed multi-controller to manage, however there is currently no mechanism for these controllers to cooperate with the each other. Based on these questions this paper presents a collaborative model for multi-domains OpenFlow networks, which allows different network domains to collaborate with each other in an efficient way.