A New Real Time Lyapunov Based Controller for Power Quality Improvement in Unified Power Flow Controllers Using Direct Matrix Converters
1
INESC-ID, 1000-029 Lisbon, Portugal, and Instituto Superior de Engenharia de Lisboa, Polytechnic Institute of Lisbon, 1959-007 Lisbon, Portugal
2
INESC-ID, 1000-029 Lisbon, Portugal, and with DEEC, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, Portugal
3
Electrical Engineering Department, University of Huelva, La Rábida, 21819 Palos de la Frontera, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Energies 2017, 10(6), 779; https://doi.org/10.3390/en10060779
Received: 17 March 2017 / Revised: 22 May 2017 / Accepted: 1 June 2017 / Published: 6 June 2017
(This article belongs to the Special Issue Power Electronics in Power Quality)
This paper proposes a Direct Matrix Converter operating as a Unified Power Flow Controller (DMC-UPFC) with an advanced control method for UPFC, based on the Lyapunov direct method, presenting good results in power quality assessment. This control method is used for real-time calculation of the appropriate matrix switching state, determining which switching state should be applied in the following sampling period. The control strategy takes into account active and reactive power flow references to choose the vector converter closest to the optimum. Theoretical principles for this new real-time vector modulation and control applied to the DMC-UPFC with input filter are established. The method needs DMC-UPFC dynamic equations to be solved just once in each control cycle, to find the required optimum vector, in contrast to similar control methods that need 27 vector estimations per control cycle. The designed controller’s performance was evaluated using Matlab/Simulink software. Controllers were also implemented using a digital signal processing (DSP) system and matrix hardware. Simulation and experimental results show decoupled transmission line active (P) and reactive (Q) power control with zero theoretical error tracking and fast response. Output currents and voltages show small ripple and low harmonic content.
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Keywords:
Unified Power Flow Controllers (UPFC); Direct Matrix Converter (DMC); digital control; real time Lyapunov
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MDPI and ACS Style
Monteiro, J.; Pinto, S.; Delgado Martin, A.; Silva, J.F. A New Real Time Lyapunov Based Controller for Power Quality Improvement in Unified Power Flow Controllers Using Direct Matrix Converters. Energies 2017, 10, 779.
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