KEYWORDS: Industrial chemicals, Mathematical modeling, Tolerancing, Data modeling, Fluctuations and noise, Power supplies, Resistance, Transformers, Electrical system failure
Voltage sag can result in petrochemical enterprise motor running back in the process of production and process abort, lower the quality of power supply, cause huge economic losses. In view of the problem that the current voltage tolerance evaluation of petrochemical plants mainly adopts the traditional sensitive equipment tolerance curve, which cannot accurately describe the voltage sag tolerance of sensitive loads, this paper proposes a voltage sag simulation and evaluation method based on nameplate data through theoretical derivation and simulation verification. First of all to establish mathematical model of induction motor based on nameplate data to calculate the model parameters of the motor; Then, using the mechanical characteristic formula of induction motor and the mechanical characteristic formula of fan or pump load, the time of transient arrival boundary removal corresponding to voltage sag depth under different loads was deduced. Finally, a simulation model was built in Digsilent software to verify the correctness of theoretical analysis.
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