The Influence of Voltage Sag on Transient State of High Voltage Unit in Polypropylene Plant
Aimming at the prominent problem that voltage sag of power supply system affects the long-term stable operation of petrochemical equipment,taking the high voltage unit of polypropylene unit as the research object,starting from the mechanism of voltage sag transient of the high voltage unit,and based on the Digsilent simulation platform,a simula-tion model of the power supply system of the device and various loads of centrifugal pumps,compressors and fans was built.The voltage sag tolerance charac-teristics of single centrifugal pump load,different centrifugal pump loads and different high voltage loads were deeply analyzed,and the key quantitative parameters such as voltage sag depth,sag tolerance time and process immunity time requirements were obtained.The research showed that the deeper the voltage sag depth was,the shorter the sag tolerance time was,and the voltage sag tolerance ability of dif-ferent loads was different.When the voltage sag depth was 50%,the voltage sag tolerance time of the key unit of polypropylene device was concentrated in 500～700 ms,providing a scientific basis for the anti-shock treatment of the device.
voltage sagpolypropylene planttoler-ance characteristicsprocess immunity timeshaking power treatmentpower quality
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