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Research on Steam Turbine Control Technology during Island Formation

Author: HuoJunQi
Tutor: ZhaoXueZeng
School: Harbin Institute of Technology
Course: Mechanical and Electronic Engineering
Keywords: Island Run Electrical overspeed protection Fuzzy self-tuning PID Simulation FPGA
CLC: TM621
Type: Master's thesis
Year: 2008
Downloads: 34
Quote: 0
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Abstract


Turbine load rejection occurs , if the speed can be stabilized at rated speed, auxiliary power operation, the island is run . Island operation of the unit is to protect the safety of equipment is an important condition for the recovery and security of the grid also has significance should not be underestimated . Turbine Island is actually running overspeed protection system control and regulation systems together results . For large steam turbine island run test speed overdrive and dynamic stability problems , the turbine overspeed protection system and the control system has been studied mainly involves four aspects: electrical overspeed protection system design, based on fuzzy self-tuning PID control regulation systems research and simulation, based on FPGA (Filed Programmable Gate Array) island operation control techniques to realize , island operation control device development and functional testing. First run speed speeding problem for the island , based on the idea of ??overspeed protection , overspeed protection of the original electrical system problems , predictable information from load shedding , quick-closing valve adjustment methods and other aspects of the control logic design electrical overspeed protection system . Then run the dynamic stability problems for the island , by studying the existing regulation and control system based on fuzzy self-tuning PID control technology, design speed controller and simulation analysis, simulation results show that the fuzzy self-tuning PID speed control superior to conventional PID control the speed and stability. Electrical overspeed protection systems and fuzzy self-tuning PID control together complete operational control island , in order to improve the control of rapidity, stability and reliability , using FPGA control functions. Speed ??measurement using measuring weeks and median filtering , with high speed, high accuracy ; pressure and power of the AD converter analog controlled by FPGA ; FPGA and host computer via serial communication to achieve high reliability of communication ; using offline the method of calculating the fuzzy lookup online self-tuning PID control to ensure the speed and accuracy of the calculation . Finally developed island operation control apparatus to the main processing chip FPGA , further comprising a signal processing circuit speed , pressure and power analog signal processing circuit , the serial communication circuit. And build test systems, online testing , test results show that each functional module is working.

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CLC: > Industrial Technology > Electrotechnical > Power generation, power plants > Power plant > Thermal power plants, thermal power stations
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