Advanced Materials Research Vols. 383-390

Abstract: PID torque damper controller was designed and PID parameters were set with RBF neural network for the torque control of large-scale variable speed pitch regulated (VSPR) wind turbine. The system state equation can be extracted by the process of modal linearization using Bladed software, then PID controller was designed, parameters optimized and verification of design test with the control system of 3MW wind turbine was taken finally. The simulation result shows that the damper controller designed reduces driving chain vibration obviously, the adaptive ability and dynamic performance of system is improved with the use of RBF neural network which makes the system with good control quality.

Abstract: To solve the room-consumption and hard maintenance of the traditional independent intermediate frequency power system (IIFPS) , this paper studied a centralized intermediate frequency power system (CIFPS) and discussed its feasibility, meanwhile, this paper took vitality and reliability as the main estimating index to work out a set of project of CIFPS. Furthermore, two sorts of intermediate frequency power systems vitality index were summarized thanks to a vitality estimating algorithm which occupied electricity equipment 3-dimension position information. This paper also analyzed the reliability of the two system mentioned above with fault tree analyzing method on the supposition that the power grid is in working order. Then the paper concludes that CIFPS is superior to traditional IIFPS in vitality and reliability.

Abstract: Based on a high speed electromagnetism valve and a two side throttle slide valve, a digital shift pressure regulation valve was designed. The electromagnetism valve was driven directly by the digital signal of electricity control system, the automatic shifting and the pressure’s real time regulation of shift clutch was achieved. The principle of the electricity control system was stated, based on the characteristic of the electromagnetism valve, the drive circuit was designed. The digital electro hydraulic automatic control system was installed on the heavy vehicle with hydro mechanical transmission, and tested. According to the test data of shift process, the control strategy is analyzed, and the validity and feasibility of the control system is proved.

Abstract: The anaerobic methane fermentation is sensitive to temperature, the higher the temperature, the more vigorous microbial activity, higher gas production. Therefore, the temperature is the main factor of methane fermentation. Northern regions due to low temperatures, biogas will be difficult to operate on their own, the need for digester heating. Solar heating is a heating system, biogas fermentation method. Effect of solar heating on the methane fermentation is one of the hotspots in this field. Using MATLAB to provide dynamic system modeling and simulation package Simulink, solar heating methane fermentation system model and algorithm, select the appropriate module on the biogas fermentation solar heating simulation, the method for solar heating in north China to provide a methane fermentation system some new ideas.

Abstract: It is of great significance on the industrial development that how to deal with the contradiction between plant’s diversity and plant’s fixed form. In this paper, taking the case of standard plant design of Da Huangshan mining subsidence standard, Xuzhou City, the modular design based on Simulation of Architectural Physical Environment so as to improve the indoor environmental quality of plant.

Abstract: To analyze the effect of high temperature on material properties of steel casing Q125 and V140 in complex deep wells, some experiments of casing material have been done at the temperature of room temperature to 350°C, and based on the former results the material property model of high-grade steel casing under the effect of temperature was established. To facilitate the design of oilfield, uniform strength reduction factor at 150°C and 200°C was given, which was applied to casing string and tubing string design under high temperature. Taking an ultra-deep field as an example, the results show that casing mechanical properties decreases with the temperature increasing; in the design process of high temperature well, the temperature effect is needed to consider.

Abstract: Natural ventilation and air temperature in glass curtain wall was investigated. A three dimension model of a four span, three floor building with double-skin glass curtain wall was built. Different outlet configurations and the effect on ventilation vector flow as well as temperature distribute were studied. The results show that under the condition of whole outlet area being a constant, large number outlet configuration provides better natural ventilation and stable temperature distribution.

Abstract: Outdoor air load plays a significant role in the air-condition system. Reducing the quantity of fresh air can be used to achieve the goal of energy saving as well as getting a comfortable environment indoor. The concentration of CO₂ is used as the indicator of measuring the quality of air indoor and it becomes a new method of controlling fresh nowadays. The conference room is taken as an example, and is commutated with ACH method, Minimum air method and CO₂ controlling fresh air method. The conclusions are as follows: If it is in the same situation,1. When there are less than 60 people, with the ACH method it costs the most fresh. That is, its energy consumption is the largest. 2. When there are 60~76 people, the CO₂ controlling fresh air method needs the least fresh air. That is, it costs the minimum energy. The ACH method and the Minimum air method are all designed in accordance with the maximum load. So with these methods it can lead to a great waste of energy. 3. When there are more than 76 people, the former two methods can’t meet the health requirements. In the end the strategy of CO₂ controlling fresh air method is given.

Abstract: Recently, the wind power develops rapidly. In this paper, the mathematic model and vector control of D-PMSG are studied. This thesis involves in simulation research of wind turbine, speed modulation, coordinate transformation, SVPWM waves, main loop and the whole system based on module structure under the environment of MATLAB/SIMULINK. The simulation results indicate that PMSM has perfect characteristic and gives practical meanings for the studies of wind power.

Abstract: The brushless constant-voltage synchronous generators are fitted with thyristor voltage regulator excitation system. The excitation current can be regulated automatically in accordance with the variation of load, resulting in constant voltage. This style of excitation has excellent kinetic in the condition of load-variation and short-circuit.