Advanced Materials Research Vols. 986-987

Abstract: This paper introduces several kinds of icing and ice-off simulation method: the equivalent load method, quality method, Támás model method and cell death method. With a large span cross section as an example, using finite element method, established the finite element model of single span icing wire, analyzed the non-uniform ice-off and the even ice-off,the results show that: Non-uniform ice-off dynamic tension is significantly smaller than even ice-off dynamic tension,the smallest dynamic tension is closely related to wire jump amplitude, the greater jump amplitude leads to the smaller dynamic tension,the essence of which is determined by the conductor slack.

Abstract: In the paper, energy storage system and charge and discharge control strategy for large-scale photovoltaic generation are designed. The optimal energy storage capacity is configurated for PV array. The energy storage system and control module for PV generation are built in MATLAB-Simulink platform. Supercapacitor (SC) is the energy storage element. Considering the insolation and temperature under the changing meteorological conditions, the output power would be fluctuant. By controlling MOSFET switches based on power signal, SC will charge when the lighting is adequate and discharge in the instance of lack of light to keep DC bus voltage in constant. Configuring the optimal energy storage capacity by simulation, the result proves that the control strategy is feasible and the configuration is optimal.

Abstract: This paper briefly introduces the characteristics of wind power technology and its development process, Through data comparison, demonstrate the superiority of the variable speed wind turbine operation. In keeping the best tip speed ratio, the variable speed constant frequency control for the biggest wind power.

Abstract: As a kind of renewable clean energy, the constant access of wind power to power grids is bound to have a great impact on the power system. Based on the grid structure in Fuxin, this paper will state the difficulty of peak regulation and the matter of wasting wind power caused by the large-scale wind power integration and put forward some reasonable methods for using the wasting wind power in the heating in winter. The relevant results indicate that capacity of local consumption of wasting wind power can be improved. Under the circumstances, it can be conductive to solve the problem of wasting wind power results from the difficulty of peak regulation as well as inspire the power system planners.

Abstract: This paper presents a theoretical line loss calculation of distribution network containing an uncertainty power of wind turbine. First, this paper establishes the theoretical line loss mathematical model considering wind turbine power constraint within the sampling period. Then this paper gets multi group wind turbine output data satisfied the power constraints through Monte Carlo simulation. By combining with the first power coefficient method and Monte Carlo simulation technique, this paper also generates multi groups load pseudo measurement test of non real time. By combining the real-time measurement of power flow calculation, a group of simulated data with minimum error between the power flow results and the real time measurement are selected. Finally based on the selected pseudo measurement, the theoretical line loss within the given time period based on periodic accumulative calculation of real-time measurement are calculated. 14 nodes example is given to verify the accuracy and practicality of the algorithm.

Abstract: Analyzed mathematical model of wind power which consist doubly-fed wind turbine (DFIG).Strategies for pitch angle control were developed.Used MATLAB to establish equivalent model contain infinite power system concluding DFIG ,The results showed that wind power with DFIG have good transient stability.

Abstract: Traditional Transmission Network Planning scheme only considers N and N-1 security , with little regard for safety of N-2 system. This paper introduces the relaxation factor establishing Transmission Network Planning model, and further considers the N-2 secure of double-circuit transmission line on the basis of relaxation on the N-1 constraints. A hierarchical genetic algorithm (HGA) Model is proposed to solve the model.The final Transmission Network Planning scheme meets the reliability requirements under uncertain environment and has the minimum overall cost.A simulation model to simulate the impact of construction of the same tower line on the investment and security of transmission network planning is builded.

Abstract: For the purpose of considering characteristics of transmission line in the round, with utilization of related knowledge in complex network, Integrative Electrical Betweenness has been put forward. The proposed index, on one hand, over comes shortcoming of assuming power only transmit along the shortest path existed in previous indexes. On the other hand, ability of transferring power when other lines removal is considered. In order to further facility to grid security control, a novel method is proposed to search key transmission section of vulnerable line. The algorithm only needs simple calculation, there is no large-scale computation. The proposed algorithm has been tested on New England IEEE 39-bus system to validate its efficacy.

Abstract: The energy, which has a close bearing on the national economy and the people’s livelihood, is always a world-wide attention issues. To promote the development of alternative fuel vehicle, we have to break through many technical difficulties, at the same time, as one of strategic emerging industry, China's alternative fuel vehicle industry future development has a high degree of uncertainty, will face a lot of risks. In this paper, we set up an evaluation index system of those risks and use AHP method and Fuzzy Synthetic Evaluation Model to assess technical risk of China’s alternative fuel vehicle industry.

Abstract: . This article is based on the concept of vulnerability for power system, and focuses on vulnerable source of distribution network and summarizes the characteristics of vulnerability assessment methodologies and inadequate for the distribution network.And pointed out that domestic and international research for distribution network vulnerability is still in the initial stages,evaluation of existing methods are accessible only from one side distribution system's security status,the vulnerability assessment methodology of distribution network can be more fully reflected the global distribution network of security that will be researched in the future.