Study and Application of Multi-valve Micro-Control Technology in Steam Turbine Excitation

China's power plant steam turbines often encounter steam turbine excitation problems in the use of steam turbines. The linkage micro-control multi-valve regulation technology studied in the paper is to use the turbine operating parameters as a reference. The internal steam excitation problem that occurs in the high-speed operation of the steam turbine, which is caused by the eccentricity of the rotor after the fault analysis; the impeller gap at each stage is unevenly distributed in the circumferential direction when the rotor has a certain eccentricity, which result in uneven distribution of steam entering the flow path in the circumferential direction; thereby it generate the same tangential force as the rotor linear velocity direction and the internal steam flow excitation of the blade. The corresponding parameter range is obtained by the micro-control change of single project parameters, the deviation of the set value and the correction parameters are determined. After the verification and practice of the valve control logic, the multi-valve adjustment linkage based on micro-control is proposed. The micro-control debugging is used to correct the influence of the eccentricity of the turbine bearing blades by optimizing the valve position command and feedback correction. Through testing and verifying the linkage micro-control multi-valve regulation technology, the function and effect of the solution are proved, which guarantees the normal operation of the steam turbine.