Calculation of sensitivity considering relationship among loads in power networks

Sensitivity method is to obtain certain relationship between dependent and independent variables, using differential relationship among physical quantities in systems. It has wide application to optimization control, fault prediction and economic operation in power systems. A new sensitivity calculation model is proposed in this paper. In this model, input and output values have certain function relationship, and in this sensitivity calculation method each input value is not independent. Based on this model, a sensitivity method considering load static characteristics is derived. A comparison is made between this method and conventional one using IEEE 39- bus system. The results show that there is obvious difference in two methods. The method also indicates that static load model plays an important role in this sensitivity calculation model, and different characteristic coefficients and load model for calculation sensitivity have a great difference. It implies that it´s needed select appropriate load model and parameters in sensitivity calculation.