Advanced Materials Research Vols. 354-355

Abstract: By studying the control algorithms of automatic train operation system,the PSO-B-BP-PID controller based on reparametric B-Spline Neural Networks and PSO is proposed.The controller can find more suitable factor by PSO,thereby, it can receive the best reparametric B-Spline basic functions fit for searching weights of the network,at the same time, by replacing the conventional backward-propagation(BP)algorithm with PSO in the paper,it can overcome the shortcomings of easily going into local optimum.By comparing the control performance of PSO-B-BP-PID,B-BP-PID and PSO-BP-PID in experiment,the results indicate the PSO-B-BP-PID can improves punctuality,comfort and stop precision in ATO system.

Abstract: This paper proposes a power qulity disturbances classification method based on generalized S-Transform(GST) and maximum similarity principle. The GST gauss window changes self-adaptively with the main frequency of the power quality disturbances. The standard modular time-frequency matrixes are constructed by selecting special segment of GST modular matrixes of every category disturbance and scale-transforming based on bilinear interpolation. The test disturbances are dealed with same as the means of standard modular construction. Especially, for representing the difference of sags and swells, spikes and notches, etc., every row average of the standard modular time-frequency matrixes and the special frequency segment of the test disturbances are subtracted and then the similarity is computed. The simulation results verify the applicability and effectiveness of the proposed classification method.

Abstract: This paper aims at constructing the 10kV distribution network simulation platform on the principle of the laboratory experiments. This project is done by using the PSCAD/EMTDC software and can simulate all kinds of ground faults in the power grid. The platform can be divided into two parts: the basic framework and the user-defined module. The basic framework includes powers, transformers, lines, control and measurement units. Meanwhile, the user-defined module contains a ground arc module, ground fault modules and arc suppression coil(ASC) modules et al. Furthermore, this paper describes several examples of the single-line-to-ground faults in the resonant grounded network. In the end, the validity of the simulation platform is confirmed by the data comparison with the laboratory experiments.

Abstract: In this paper, a similar historical meteorological data search technique was put forward. This method took the weather forecasting data as clustering center, found those days that had the similarity weather factors, and then decoupled these loads into secular trend load and meteorological load as sample data for load forecasting. This method can improve the similarity of the loads between forecast day and sample days. Simulation results showed that these methods are valid and can make the load forecast more precision.

Abstract: At present, dispatchers analyze the power transmission from change of operation modes always by their own experiences, so currency of the result cannot be proved. Also, because these works depend on recognize of dispatcher to electrical system, objective of the result cannot be proved. For this problem, we developed this software based on the analysis of power supply path. It reveals inherent laws of power transmission in network and provides an analyzing and assisting tool for dispatchers.

Abstract: The chief technical characteristics of the supporting system for smart grid control center include: wide area, panorama, distribution, integration, sensitivity, foresight and risk defense. The essential element in real-time monitor, control and early warning is to realize early warning and preventive control. The dispatch planning is to realize unified, coordinated and refined plan compilation and its close loop safety check at different levels, with multiple targets, multiple obligations, and multiple periodes. The dispatch management shall focus on enhancing flexibility, standardize business flow and integration of different levels coordination . This paper first presents the general system design, compared it with current technical support means to introduce the system framework and key features. In the end, several key technical issues are discussed and described with the application prospects.

Abstract: The communication method of the automatically drainage monitoring system for underground coal mine is researched. The advanced PLC control technology and visual InTouch human-machine interface are used to design the control system. The information which is measured by downhole monitoring device can be real-timely transmitted to the ground monitoring stations through the Ethernet optical fiber communication system.The monitoring system can realize on-site manual and automatic control, also can realize remote monitoring and management.This paper mainly describes the implementation process and implementation principle of the data transfer between control unit and remote host computer via Ethernet technology.

Abstract: This paper studies the root-cause analysis based on the time delays among various signals, for reducing nuisance alarms in modern industrial systems including power grids. Time delays are estimated via the revised nearest neighbor imputation method, and are validated via the subsequent consistency check. Numerical examples including the IEEE 5-node system as a prototype power grid are provided to demonstrate the effectiveness of the proposed time delay estimation method and the subsequent consistency check.

Abstract: Fuzzy Control;Matlab;Electronic Oven;Maxium Mean Method;Defuzzification Abstract:Aimed at the shortcomings that it is difficult to establish accurate mathematical model of electric oven and to master the complexity control process for beginners,the fuzzy controller was applied to realize automatic control of the electronic oven.Described in detail the establishment of the fuzzy rules and the definition of input and output quantity in this paper. Established the experimental platform by Matlab software taking determining the barbequed time for example.During the simulation,adopted the minor arithmetic to inference the fuzzy rules and average maximal arithmetic to get the result of defuzzification,the result and theory calculation are approximation identical.The design can effectively control the oven and achieve good effect.

Abstract: This paper presents a new winding parameter model of UHV transformer used by On-line Least- Squares Identification Algorithm (OLSIA) to estimate winding parameters. This paper also provides the criteria to estimate the accuracy of identification model. With EMTP simulation tool, this paper establishes the model according to parameters of the first UHV power transmission system in China, simulates various situations such as UHV transformer energizing, external fault, internal fault, normal operation in the model, and demonstrates that the OLSIA based on the new transformer model is capable to estimate the winding parameters accurately in various conditions, especially in stable-state condition.