Research Of Turbine Governor MSMA Speed Switching Value

Turbine governor is one of the most important auxiliary equipment for hydropower system, its performance will directly affect the level of quality to power generation. Turbine governor works by changing the opening of the unit to change the water guide unit active power input, thus maintaining the stability of the entire power system active power. Therefore, it is a very important significance for the study of turbine governor. At present, the researches on the turbine governor regulation accuracy is mainly concentrated in the control algorithm. Further enhance its overall regulation accuracy is a prerequisite for the pilot valve control accuracy greatly improved. As an important part of the turbine governor, most servo valve structure were used in hydraulic amplification device pilot valve station at present. In this paper, the research focus at home and abroad precision devices that the magnetic shape memory alloy was used to a driving source. The design has developed a high-precision, high-frequency characteristics of the high-speed switch valve, in order to meet the turbine debugger pilot valve control accuracy requirements. Magnetic shape memory alloys have many properties combines high strained, high precision, high frequency response and high reliability. It is currently the precision fluid transmission and control, precision machining and other applications in the field of research and application of hot material. However, the nonlinear magnetic hysteresis shape memory alloy material and increases the difficulty of complex constitutive relation of its application, coupled multi-physics theory it also becomes difficult. The most commonly business used analytics software such as simulation analysis module magnetostrictive materials are related to the ANSYS finite element software, Mat Lab / Simulink software, which is provide a very good condition to simulation research papers.The background of this thesis is precision valve technology. Analysis governor hydropower structure and regulation of principle, the new valve types, magnetic shape memory alloy materials and other basic principles of performance, combining the MSMA material to drive the valve body structure has been designed and identified material parameters and structural dimensions of the part. Then, the study of shape memory alloy material hysteresis magnetic properties of six kinds of nonlinear constitutive theory model analysis. Then using Mat Lab / Simulink software pilot servo valve carried out all aspects of the main valve structure modeling and simulation analysis, using ANSYS software MSMA material driving magnetic circuit simulation analysis. Final processing and built an experimental test platform, part of the valve driving source were tested after optimization experiments by comparing the simulation and experimental data, the model of the body structure optimized design, on this basis, we propose a new structure for a servo valve.