Abstract. Aimed at the problem of engineering vehicle hydraulic mechanical transmission system efficiency is low.Thispaper mainly study of the engineering vehicle automatic transmission shift schedule.Through the artificial set the minimum numerical efficiency,this paper obtained the automatic transmission shift schedule,changed the output of the torque converter speed;And through the establishment of Matlab/Simulink based simulation system,this paper simulated and validated the process of vehicle automatic transmission.Even in the case of the speed change,the transmission of the vehicle can be through the shift operation to keep the turbine to maintain high power output,and can control the transmission efficiency of the vehicle torque converter in the relative ideal range.The study provides a theoretical basis for energy saving transformation of the domestic engineering vehicle.
In order to regulate the voltages of Point of Common Coupling (PCC) and single wind turbine in a wind farm, it is necessary to control the output of reactive power of wind turbines, and in some case, it also need to control static var compensators (SVCs) or static var generators (SVGs) of the wind farm to satisfy the voltage set-point requirement. The accuracy of reactive power control system decides the control level of grid voltage. In order to improve the accuracy, this paper introduces modeling and simulation method of wind farm reactive power control system using DIgSILENT and MATLAB . At first, it introduces the modeling process and co-calling principle of the two kinds of software tools, and then emphasizes that it develops a kind of advanced wind farm reactive power control logic to realize control accuracy improvement in MATLAB, whereas the power quality and distribution logic of reactive power among wind turbines are simulated and assessed. In the end, taking an Inner Mongolia wind farm with 33 double-fed wind turbines as a test application, the wind farm reactive power control model is verified by comparing real wind farm operating data and simulation results, and the result shows that the accuracy of reactive power control system is higher than traditional method.
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