Advanced Materials Research Vols. 986-987

Abstract: Batteries are used the energy storage of the pure electric vehicle. When the battery pack work in the high temperature environment for a long-term, permanent damage that high temperature does to the battery cannot be restored, the battery life will be drastically reduced. When the batteries temperature reaches a relatively high value, the battery pack will caught fire. This paper firstly analyzed the characteristic of the Lithium-ion Battery by batteries experiment. On the basis of the thermal experiment ,this paper do a lot of research of the cooling method by ANSYS and verified the accuracy of the model of the thermal model.

Abstract: In order to solve the problems of strong coupling and nonlinear parameters of superheater model, in this paper, we aimed at a 600MW subcritical drum boiler high temperature superheater as the object of study .On the basis of mechanism analysis and its dynamic characteristics I built a dynamic model of high superheater contains 9 typical working conditions .I optimized the model parameters by using field data. A continuous nonlinear model is obtained by curve fitting. The simulation results show that superheater model built by this method can better simulate the field characteristic. This model provides a reference design of automatic control system of main steam temperature .This paper aims to provide the basis for the application of advanced control algorithms in the field. Furthermore, this model can provide higher accuracy for on-site training to improve training effect.

Abstract: According the experience of gas pipeline project in the Middle-Asia district, the writer analyzes and concludes the design feature for the pipeline route and the process scheme for the gas pipeline project in the Middle-Asia district. For the requirement of code SNIP, ASME and Chinese specification, the writer analyzes the difference and design feature on the design requirement and draws the conclusion. The pipe grade, design parameter, wall thickness selection and the process design for station are detailed described in the article, which can expand the design thought and provide the reference for the similar project.

Abstract: Energy-saving hierarchical design model is established for differentiate architecture. From current status of China's construction, exploration research is established on energy-saving hierarchical design model of differentiate architecture to evaluate indicator system of energy-saving building. Availability of evaluation information in index system is low, so it is difficult to play the role of evaluation of building energy-efficiency. EHTV difference method is used to calculate and evaluate energy-saving design of hierarchical building, including: heat transfer indicator of building envelope targets, air conditioning and heating consumption, basis of EHTV indicators.

Abstract: Because torque ripple disturbance can be created when the brushless dc motor is communicating, In this paper, from two aspects of energy feedback and the torque ripple, H/L - PWM - ON control strategy is analyzed .And a simulation system is set up. Through the trials, it shows that H/L - PWM - ON strategy can efficiently complete the energy feedback, has small torque ripple, and fully proves the feasibility and practicability of this control strategy.

Abstract: This paper focuses on selecting control of parallel generator that ensures safety and efficiency operation in oil & gas offshore pipeline application. For island grid system, the advanced microcontroller based digital isochronous method of active load sharing is introduced. The programmable logic controller system is adapted to automatic load sharing.

Abstract: In this paper, the directly driven wind turbine with permanent magnet synchronous generator (D-PMSG) is investigated, the mathematical model of which is built up. Also, the chaotic behaviors or limit cycle phenomena is demonstrated under certain working conditions or the parameters of the model having a certain range of values. A novel adaptive controller is designed based on the quasi-Lyapunov stability theory for fractional-order systems. Also, electronic circuits are designed to realize the controllers using Multisim. The simulation results demonstrate the effectiveness and realizable ness of the proposed methods, besides, the research results will be provided as theoretical references for the study of improving control performance.

Abstract: In order to prevent DC link voltage pump during braking, a paralleled release circuit composed of chopper and resistor is often employed. As a result of energy waste on the resistor, the efficiency of the motor drive system is low in the case of frequent braking. To improve the efficiency, an energy-saving scheme of motor drive systems based on ultracapacitors is proposed in this paper. An energy storage system (ESS) paralleled with the DC link of the motor drive is adopted in the scheme, which is composed of a bidirectional DC-DC converter and ultracapacitors. The ESS can realize recycling of the braking energy. Compared with PWM rectifier, this scheme can avoid various technical requirements for grid-connected inverters.

Abstract: Dual inverter fed open-end winding induction motor (OEW-IM) is a new solution for multilevel drive. Comparing with traditional multilevel converters, the dual inverter is being interested in for its more flexible current control, the absence of fluctuating neutral point, and fault-tolerant capability. This paper analyzes the potential common-mode voltage (CMV) in the open-end winding induction motor system, and proposes a new space vector PWM (SVPWM) strategy to reduce the CMV. The proposed method is validated by simulations and experiments.

Abstract: Brake pedal feel is intuitive feelings for the driver and affected vehicle safety performance. Due to the participation of the motor, brake force distribution and the original pedal feel of the driver would be changed. Based on the traditional hydraulic unit of ESC, Jilin University developed a braking energy recovery system of uniaxial decoupled. A series of fixed partition coefficient control strategy was developed, coordinated control of electrical regenerative braking and hydraulic braking was carried out. Vehicle test was carried out for coordinated braking strategy, parallel strategy and traditional control strategy. Vehicle test results show that the brake pedal travel simulator and the coordinated braking strategy can improve the energy recovery, and ensure that the brake pedal feel is consistent with the traditional vehicle.