A wave filtering based electric load curve decomposition method for AGC

This paper proposes a wave filtering based electric load curve decomposition method for automatic generation control (AGC). A two-step scheme is used for the load curve decomposition to get three different components which are characterized by different frequencies. Butterworth low-pass filtering algorithm (BLFA) is used in both steps. In this filter algorithm, the framework of infinite impulse response (IIR) is used and the BLFA´s four key parameters such as passband cut-off frequency, passband attenuation, stopband cut-off frequency and stopband attenuation are set according to the characteristics of the electric load. Logarithmic phase frequency response curve for BLFA is analyzed and a time delay compensating algorithm (TDCA) is developed in each step, too. The numerical tests on a provincial power grid prove that the proposed load curve decomposition method is practical.