FIR필터를 이용한 전력계통의 주파수 편이 추정에 관한 연구 = A Study on the Estimation of Frequency Deviation in the Power System using FIR Filter

다국어 초록 (Multilingual Abstract)

Nowadays as the power systems have been more complicated and have grown to U.H.V systems, the necessity for accurate and high speedy control schemes increases rapidly to improve the reliability and stability of power system. Electric power systems sustain transient frequency swings whenever the balance between generation and load does no longer hold. To cope with this constraints, it requires an accurate and high speedy frequency deviation estimation technique and suitable adjustment to obtain the power system energy balance. This paper presents a FIR(finite duration impulse response)filter in order to reduce the computational burden of conventional digital filtering algorithms like DFT(discrete Fourier transform), BPF(block pulse function), Harr in the frequency components of 3- phase signals are first extracted by using an algorithm based on FIR filter, and then symmetrical components are calculated to obtain a phase angle of a positive sequence voltage. The rate change of the positive sequence phase angle is used for estimation of power frequency deviation. Also, to comfirm the validity of the proposed algorithm, it is shown the experimental results obtained by using the digital simulation of power system. And, it is discussed the estimated results of frequency deviation of the DFT algorithm and FIR algorithm.