Fast positive sequence component detection schemes based on delay operational period filter

• Published in: CSEE Journal of Power and Energy Systems Vol. Early Access; p. 1
• Main Authors: Du, Liwei, Xiong, Liansong, Li, Mingxian, Tang, Zhen, Xiu, Liancheng, Ma, Xun
• Format: Journal Article
• Language: English
• Published: Beijing Chinese Society for Electrical Engineering Journal of Power and Energy Systems 01.01.2020
• Subjects: Acceptable noise levels; Algorithms; Computer simulation; Coordinate transformations; Delay; Sampling; Unbalance
• ISSN: 2096-0042; 2096-0042
• DOI: 10.17775/CSEEJPES.2019.02810

Fast and effective detection of positive sequence components (PSCs) is an indispensable condition to improve the control performance of the inverter under unbalanced grid conditions. To improve the extraction speed of PSC voltages under the unbalanced grid, this study proposes a delay sampling period filter (DSPF) to quickly separate DC components and second harmonic components by delaying two sampling periods of a grid voltage in the dq frame. Using the DSPF method, only one coordinate transformation is required and the computational burden can apparently be reduced. Then the noise immunity performance of the proposed DSPF algorithm has also been investigated and the corresponding solution, and delay operational period filter (DOPF), can guarantee the desired fast response performance under the premise of limiting the amplified noise within the acceptable range. Finally, the simulation model is built by MATLAB and the experimental platform is set up by a single-board digital control system to verify the feasibility and priority of above two algorithms.