AN IMPROVED HIGH-ACCURACY ALGORITHM FOR FREQUENCY MEASUREMENT BASED ON FOURIER TRANSFORM
Mo Shaoqing 1, Li Xiaocong 2 (1.Guangxi University for Nationalities, Nanning 530006, China) (2. Guangxi University, Nanning 530004, China)
Based on theoretic derivation, this paper reveals the causes of error existing in the traditional Fourier frequency-tracking algorithm. Furthermore, an improved algorithm, which can eliminate the error, is proposed in the paper. Digital simulation and field applications show that this algorithm improves the output-data accuracy, can track the variations of the frequency in a wide range and has met the requirement of frequency measurement for power system automation devices.
【CateGory Index】： TM935.1