Advanced Materials Research Vols. 1006-1007

Abstract: In this paper a method of designing intelligent smart car based on msp430 MCU is introduced. The method uses automatic control theory, detection technology, and the mcu receives signals which were collected and transmitted by the sensors fixed in front of the car and tyre, then controls the navigation of the motor to make the car go forward or change direction with unmanned operation system. The paper shows the design of both the hardware and software of the intelligent car system. The tests show that the smart car functions well as expected. Also, the design can be applied in automatic parking system and manufacturer transportation.

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Abstract: In order to control heat treating furnace temperature and transfer real time data, an embedded control system has been built. The system’s hardware was mainly made up of microcontroller, analog, digital and RS485 interfaces. It has the ability of exchanging data with an industrial PC via SCADA Modbus network. According to the features of control process and the hardware’s performance, the system’s software was divided into Modbus task, control task, I/O scan task, panel task, and alarm task. The RTX51 Tiny was used as software kernel. By running in cooperative multitasking manner, the five tasks handle various functions of the system. Each of the five tasks is introduced. The task scheduling is explained. It is shown that the system can meet the requirements of process control and data acquisition. With the advantages of multitasking structure, simple hardware frame, reliable network communication and low cost, the design method we mentioned is valuable for developing embedded control systems.

Abstract: The method to discriminate the fault within or beyond the protective zone according to the signals with high frequency detected in protection has problem with low reliability when the resistance of earth fault is high. The transient voltage with low frequency detected in protection can reflect the size of fault intensity approximately, and the transient voltage with high frequency detected in protection in internal fault is bigger than that in external fault when the size of fault intensity is same. The high frequency transient voltage and low frequency transient voltage detected in protection are chosen as inputs and fault section as outputs for training and testing the neural network for fault identification in the UHVDC transmission line, fault section can be identified when input fault characteristic data to the trained model. A variety of transmission line earth fault situation are simulated by PSCAD, and this earth fault section identification method based ANN shows satisfactory performance, even the fault resistance is high.

Abstract: A novel phase shifting transformer is proposed for the application of multi-pulse rectifier, which is based linear motor, and has the advantages of simple structure, easy to manufacture, etc. Introduces the operating principle. Without considering flat phase shifting transformer longitudinal end-effect and transverse end-effect, analyzes the magnetic field distribution of the flat phase shifting transformer, it provides an optimal way to this novel phase shifting transformer.

Abstract: With the growing popularity of network, more and more people use embedded portable devices to carry out e-commerce by wireless network. However, the security of wireless network is increasingly grim. According to the WPA/WPA2, this paper focuses on authentication issues between access point AP and wireless client STA in the wireless network security, and presents an improved protocol to resolve these problems. The improved one based on 4-way handshake protocol can resist dictionary attack, DOS attack and phishing attack. In the End, the paper analyzes the protocol.

Abstract: According to the causes and characteristics of coal floor water disasters,this paper designs the visualized electric pre-warning system in the working face floor,introduces the theoretical basis and purpose, and elaborates the function modules and software structures.The system, connecting the original high density electric instrument device into a network, adopting the spacial synchronous monitoring technology in the underground electric field,collecting the apparent resistivity informations of the equipment in real time through the computer network, can be used to carry out the real time monitoring study of the water disaster from the coal seam floor.Practical application shows that the results obtained can effectively reflect the actual situation and the system has good application prospect in coal mine water inrush disaster prevention and treatment.

Abstract: The TTCAN network protocols have been achieved based on the MPC5121e microprocessor in embedded real-time operating system VxWorks. The optimal solution is calling the callback function of the interrupt service routine to complete the CAN network data transmission and using the auxiliary clock to calculate the local time offset.

Abstract: To find an effective and reasonable method for calculating precisely the output power of the PV power plant, adaptive neuro-fuzzy inference system (ANFIS) based on Takagi-Sugeno (TS) is proposed. Analysis of the various weather factors that affect the output power of the PV power plant, and select the appropriate input ,MATLAB as a tool ,depend on the different input variable to establish different output power of photovoltaic power plants based on the subtractive clustering the ANFIS model .Results show that all the model has a high accuracy and meet the practical engineering application requirements,by comparing models choose the optimal model.

Abstract: Continuous co-phase traction power supply system is the major change of the traction power supply. It is important to analyze the transient response characteristics of overhead contact line for the traction substation feeder protection. This article introduces the main structure of continuous co-phase traction power supply system and the control strategy of traction substation. Meanwhile, transient responses of overhead contact line in the earth short circuit are studied, including metallic earth short circuit and non-metallic earth short circuit (high resistance ground). In the PSCAD/EMTDC electromagnetic transient simulation environment, the effects on the system and the recovery process are studied which the fault occurred in the output interface of traction substation and occurred in overhead contact line.