Open direct drive wind turbine virtual simulation system can be used for experimental teaching and training. This paper briefly describes the status quo of virtual simulation experiment and the necessity of researching the simulation experiment system of direct drive wind turbine. The wind model, wind turbine model, generator model, converter model, booster station model, monitoring system, 3D display interface, equipment display and operation interface of direct drive wind turbine simulation system are described, and the functions of simulation system are discussed.
In view of the short transmission distance, small coverage, poor penetration, and poor data transmission stability of the current instrument system, this paper proposes a design scheme for a multi-instrument remote wireless acquisition system based on narrowband Internet of Things. In terms of hardware, it mainly includes STM32 main control module, acquisition module, BC95 wireless communication module and power supply module, etc.; software mainly includes BC95 module communication module and concentrator main control module. The collected multi-meter data is sent to the upper management system using narrowband Internet of Things communication technology to realize remote data reading of multiple meters. Through experiments, the influencing factors of the upload rate of the wireless water meter collection system are studied, and it is verified that the upload rate of the wireless collection system designed in this paper meets the usage requirements.
In the fields of electrical, automation, power transmission and transformation engineering, rail transit, aerospace and other fields, the connection of wires and cables is an important link in the safe operation of electrical lines and the whole system, and the demand for lightweight connection technology is more urgent. Traditional wire and cable connection, this way is not difficult to cause cable joints loose, corrosion and aging phenomenon, there are many potential hazards. Therefore, enhancing the connection method of wire and cable joint and improving the processing quality and reliability of cable joint is essential measures for the technological progress of various enterprises related to wire and cable. In this paper, the principle, characteristics, realization process, forming condition and quality effect of the welding joint are dealt within detail. The experimental results show that the welding effect is very good, the dissimilar materials are closely linked without gap, the welding process takes a very short time, there is no smoke, gas generation, green environmental protection.
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