Transient Voltage Stability Analysis Of Oilfield220KV Grid Based On Dynamic Load Model

With the development of the economy, the safe supply of crude oil is more important. Oilfield power system safety and stability related to the safe production of crude oil. Shenglioilfield power system is a heavy-duty, multi-branch, multi-motor network. Their grid stabilityanalysis is more important. As the load increasing, there is the hidden danger of the systemvoltage stability in the northern of Yellow River grid, especially the transient stability.Because of the existing oilfields grid static voltage analysis, it did not consider the dynamiccharacteristics of the motor load. The power grid dispatching lack of analysis capabilities oftransient voltage stability and the capabilities of preventing the problem of transient voltagestability after system failures occur. Therefore, analysis of oilfield transient voltage stabilitybased on the dynamic load model is important.The oil field power system based on the dynamic load model is taken as the researchobject in this paper. In order to analyze the oilfield transient voltage stability, transientstability margin is analyzed and maximum power of the system is forecasted. First, theimproved dynamic load model parameter identification method based on trust region methodis proposed in this paper. In order to verify the validity of the identification algorithm, a IEEE3machines9node model is established. Secondly, the maximum power predicted by PVcurve and linear stability margin based on used trust region method is used to identify systemdynamic load parameters, and calculate the error values, In order to verify the validity of thelinear stability margin index, established the IEEE14nodes standard model is establishedbased on dynamic load model. Finally, Shengli Oilfield main grid simulation model based ondynamic load model is established in this paper, and verify the validity of this model by actualdata. System dynamic load parameters are recognized by trust region method based on thequadratic interpolation. In order to verify the validity of maximum power by linear stabilitymargin value in different operating state. The maximum power in the system of normaloperation mode and the N-1operating mode is forecasted by PV curve and linear stabilitymargin index, and the error values are calculated.The improved dynamic load model parameter identification method based on trust regionmethod is proposed in this paper. Shengli Oilfield grid transient voltage stability is analysed by linear stability margin index. This method overcomes the shortcomings of traditionalalgorithms, such as linear differential, large amount of computation and so on. It has a goodreal-time performance and adaptability, and can be better applied to the analysis of transientvoltage stability in oilfield power system.