In case of linear variable differential transducer(LVDT)of the servo valve position feedback device

the valve position is difficult to be fixed after the PID control is switched to manual control.According to control principle of the oil motive and combining with control characteristics of the oil motive servo valve

control model of the oil motive under fault condition of the valve position feedback device LVDT was established.Moreover

this control model was applied on ultra supercritical 1 000MW unit of Guangdong Huizhou Pinghai Power Plant to optimize its original oil motive control logic.The simulation results and actual experimental results indicate that

the optimized oil motive control logic can stabilize the valve position quickly under fault condition of the servo valve position feedback equipment LVDT.It can control the rotation speed within 300r/min once the fault occurred and 200r/min after the speed experienced three waveforms.