A novel phase-locked loop applied on frequency fluctuation of EAST power supply. (December 2020)

• Record Type: Journal Article
• Authors: Tan, Liang; Fu, Peng; Wu, Yanan; Lu, Jing; Shen, Xianshun; Li, Jun; Tian, Yunxiang
• Is Part Of: Energy reports. Volume 6(2020)Supplement 9
• Page Start: 452
• Page End: 461
• Publication Date: 2020-12
• Subjects: Adaptive notch filter -- Low pass filter -- Phase-locked loop -- EAST power supply; Power resources -- Periodicals; Energy industries -- Periodicals; Power resources; Periodicals; Electronic journals; 621.04205
• DOI: 10.1016/j.egyr.2020.11.214
• Languages: English
• ISSNs: 2352-4847

Abstract

Abstract: The excellent performance of synchronous phase locked technology is the basis of improving the power quality of Experimental Advanced Superconducting Tokamak (EAST) power system. The conventional synchronous reference frame phase-locked loop (SRF-PLL) with low pass filter (LPF) has a poor filter capacity for the 2nd harmonic component as the fundamental frequency fluctuation due to the high-power, high-parameter operation of the EAST. To improve accuracy of the phase estimation, adaptive notch filter (ANF) will be introduced into the LSRF-PLL to reject the disturbance of 2nd harmonic component, which can adaptively track the fluctuation of fundamental frequency with least mean square (LMS) algorithm. A novel composite algorithm of LPF and ANF SRF-PLL (LASRF-PLL) is presented to suppress the disturbance of the frequency fluctuation and harmonic pollution. At the last, the performance of the proposed LASRF-PLL is finally validated by simulation results of MATLAB software.