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Application and Research on Damper of Magneto-rheological Fluid in Electro-hydraulic Servo Servo System of Hydraulic Dynamo

Author: FuZuo
Tutor: WangLiQuan
School: Harbin Engineering University
Course: Mechanical and Electronic Engineering
Keywords: Electro-hydraulic servo system Crawl Magnetorheological Neural Networks Integral control
CLC: TM311
Type: Master's thesis
Year: 2007
Downloads: 73
Quote: 0
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Abstract


Domestic turbine generator in sequence valve control mode , the steam into the tone of small oscillation phenomena , which directly affects the stable operation of the generator , the power quality produce extremely disruptive . The low-speed characteristics of the turbine generator electro-hydraulic servo speed control system is one of the main tasks of the power system . Electro - hydraulic servo speed control system due to the presence of dry friction nonlinear factors in the low-speed stage jump movement , known as crawling . Crawling show that the instability of the electro-hydraulic servo system , will seriously affect the stability of the turbine generator speed , thereby affecting the supply frequency of the turbine generator . In-depth analysis of the turbine generator speed instability is due to the electro-hydraulic servo system unstable performance in the low - speed zone , while the impact of the low-speed performance of electro-hydraulic servo system is dry friction , to improve low-speed performance of electro-hydraulic servo system must the friction force to be compensated for. Nonlinear model of the electro-hydraulic servo system there is dry friction . Crawling form of limit cycle oscillation characteristics of unstable nonlinear systems , eliminate crawling from the non-linear field of view, based on the analysis of crawling reasons , proposed compensation dry friction negative stiffness approach . Absorbing domestic and foreign advanced research in the field , summarizes the advantages and disadvantages of the conventional friction compensation method , designed a new type of magnetorheological damper as compensation damping of the turbine generator electro-hydraulic servo system , taking into account its model of non- linear , and the presence of dry friction model perturbation , intelligent control approach , designing a RBF neural network control magnetorheological damper input current , and ultimately achieve the purpose of compensation system dry friction negative stiffness . Hydraulic servo control system for the damping compensation after the turbine generator , the introduction of integral control via linear state feedback to achieve low-speed tracking system , to increase the low speed dynamic performance of the servo system . The simulation results show that : the closed-loop system is no longer dynamically Yu no overshoot , has a good dynamic quality , fully meet the control requirements .

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CLC: > Industrial Technology > Electrotechnical > Motor > Generators, large the generator group ( Zonglun,) > Turbine Generator
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