Frequency-adjustable Positive Sequence Detector For Power Conditioning Applications

This paper proposes a novel and simple positive sequence detector (PSD), which is inherently self-adjustable to fundamental frequency deviations by means of a software-based PLL (Phase Locked Loop). Since the proposed positive sequence detector is not based on Fortescue's classical decomposition and no special input filtering is needed, its dynamic response may be as fast as one fundamental cycle. The digital PLL ensures that the positive sequence components can be calculated even under distorted waveform conditions and fundamental frequency deviations. For the purpose of validating the proposed models, the positive sequence detector has been implemented in a PC-based Power Quality Monitor and experimental results illustrate its good performance. The PSD algorithm has also been evaluated in the control loop of a Series Active Filter and simulation results demonstrate its effectiveness in a closed-loop system. Moreover, considering single-phase applications, this paper also proposes a general single-phase PLL and a Fundamental Wave Detector (FWD) immune to frequency variations and waveform distortions. © 2005 IEEE.200519281934Fortescue, C.L., Method of symmetrical co-ordinates applied to the solution of polyphase networks (1918) AIEE Transaction, (37), pp. 1027-1140Begovic, M.M., Djuric, P.M., Dunlap, S., Phadke, A.G., Frequency Tracking in Power Networks in the Presence of Harmonics (1993) IEEE Trans. on Power Delivery, 8 (2), pp. 480-486Deckmann, S.M., Marafão, F.P., Time based decompositions of Voltage, Current and Power Functions (2000) IEEE International Conference on Harmonics and Quality of Power, pp. 289-294Jiang, M.C., Pan, C.T., Fast peak detector for variable frequency three-phase sinusoidal signals (1994) IEE Proceedings of Systems and Circuit Devices, 141 (3), pp. 151-156Kaura, V., Blasko, V., Operation of a Phase Locked Loop System Under Distorted Utility Conditions (1997) IEEE Trans. on Industry Applications, 33 (1), pp. 58-63Silva, S.A.O., Donoso-Garcia, P., Cortizo, P.C., Seixas, P.F., A Three-Phase Line-Interactive UPS System Implementation with Series-Parallel Active Power-Line Conditioning Capabilities (2002) IEEE Trans, on Industry Application, 38 (6), pp. 1581-1590Zhan, C., Fitzer, C., Ramachandaramurthy, V.K., Arulampalam, A., Barnes, M., Jenkins, N., Software Phase-Locked Loop applied to Dynamic Voltage Restorer (DVR) (2001) IEEE Power Engineering Society Winter Meeting, 3, pp. 1033-1038Jesus, F.D., Soares, C.F.T., Neto, J.L.S., Watanabe, E.H., Aredes, M., Carvalho, J.R.D., Leal, M., Improvement of a Positive Sequence Components Detector in a Unbalanced Three-Phase System (2003) Brazilian Power Electronics Conference (COBEP)Awad, H., Svensson, J., Bollen, M., Phase Locked Loop for Static Series Compensator (2003) European Power Electronics Conference, , EPEMarafão, F.P., Deckmann, S.M., Pomílio, J.A., Machado, R.Q., A Software-Based PLL Model: Analysis and Applications (2004) Brazilian Automatic Conference, , CBAMarafão, F.P., Deckmann, S.M., Luna, E.K., A Novel Frequency and Positive Sequence Detector for Utility Applications and Power Quality Analysis (2004) International Conference on Renewable Energy and Power Quality (ICREPQ)Aström, K.J., Wittenmark, B., (1997) Computer-Controlled Systems: Theory and Design, , Prentice Hall IncNise, N.S., (2000) Control Systems Engineering, , John Wiley & SonsPeng, F., Ott, G., Adams, D., Application Issues of Active Power Filters (1998) IEEE Industry Application Magazine, 4 (5), pp. 21-30Aredes, M., Fernandes, R.M., Miranda, U.A., Neto, J.L.S., Cordeiro, A.A., Simulation study of a low-cost series compensator for voltage sags, harmonics and unbalances applied to a practical system (2003) Brazilian Power Electronics Conference (COBEP)Deckmann, S.M., Melo, E.F., Evaluation of Voltage Quality Indexes for Harmonic Distortion, Flicker and Sequence Components (1998) IEEE International Conference on Harmonics and Quality of Power, pp. 549-55