Sensitive Load Voltage Compensation Performed by a Suitable Control Method

This paper proposes the usage of a repetitive-based control to dynamically restore the voltage applied to sensitive and critical loads of power system. The control intrinsically is able to wipe off harmonic distortion and relies on simple transfer function. As a consequence, there is no need to apply harmonic selective filters. Furthermore, the control system is able to work out on sinusoid references and, thus, avoids the need of employing the dq transform. A recursive least-squares is also included to the control system in order to assure the synchronization of the voltages to be restored. The design of the control parameters along with the system stability is discussed. The experimental results are produced with a setup of a three-phase series compensator. The scenarios for emulating faulty voltages are the same for experimental and simulated results. The results corroborates the usage of the proposed method.

[1]  L.A.L. de Almeida,et al.  Covariance management based RLS algorithm for phasor estimation in severely noisy systems , 1998 .

[2]  Yun Wei Li,et al.  Distribution System Harmonic Compensation Methods: An Overview of DG-Interfacing Inverters , 2014, IEEE Industrial Electronics Magazine.

[3]  Mahesh K. Mishra,et al.  An Improved Direct AC–AC Converter for Voltage Sag Mitigation , 2015, IEEE Transactions on Industrial Electronics.

[4]  E. Acha,et al.  Dynamic Voltage Restorer Based on Flying Capacitor Multilevel Converters Operated by Repetitive Control , 2009, IEEE Transactions on Power Delivery.

[5]  Alex Simpkins,et al.  System Identification: Theory for the User, 2nd Edition (Ljung, L.; 1999) [On the Shelf] , 2012, IEEE Robotics & Automation Magazine.

[6]  Seung-Ki Sul,et al.  Controller design for dynamic voltage restorer with harmonics compensation function , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[7]  Darlan A. Fernandes,et al.  Instantaneous Sequence-Component Resolution of 3-Phase Variables and Its Application to Dynamic Voltage Restoration , 2009, IEEE Transactions on Instrumentation and Measurement.

[8]  Behrooz Mirafzal,et al.  A Method of Seamless Transitions Between Grid-Tied and Stand-Alone Modes of Operation for Utility-Interactive Three-Phase Inverters , 2014, IEEE Transactions on Industry Applications.

[9]  Mahesh K. Mishra,et al.  A Control Scheme for Storageless DVR Based on Characterization of Voltage Sags , 2014, IEEE Transactions on Power Delivery.

[10]  F. Blaabjerg,et al.  A detailed comparison of system topologies for dynamic voltage restorers , 2005, IEEE Transactions on Industry Applications.

[11]  Kai Zhang,et al.  A Repetitive Control Scheme for Harmonic Suppression of Circulating Current in Modular Multilevel Converters , 2015, IEEE Transactions on Power Electronics.

[12]  E. Acha,et al.  A Versatile Control Scheme for a Dynamic Voltage Restorer for Power-Quality Improvement , 2009, IEEE Transactions on Power Delivery.

[13]  Frede Blaabjerg,et al.  A Robust Control Scheme for Medium-Voltage-Level DVR Implementation , 2007, IEEE Transactions on Industrial Electronics.

[14]  Pericle Zanchetta,et al.  Resonant-repetitive combined control for stand-alone power supply units , 2014, 2014 IEEE Energy Conversion Congress and Exposition (ECCE).

[15]  S. Hara,et al.  Repetitive control system: a new type servo system for periodic exogenous signals , 1988 .

[16]  M. S. Sachdev,et al.  A recursive least error squares algorithm for power system relaying and measurement applications , 1991 .

[17]  Huang Hao,et al.  Control strategy of PV inverter under unbalanced grid voltage sag , 2014, 2014 IEEE Energy Conversion Congress and Exposition (ECCE).

[18]  Alberto S. Lock,et al.  Sensitive load voltage compensation with a suitable control method , 2015, 2015 IEEE Energy Conversion Congress and Exposition (ECCE).

[19]  D. Fernandes,et al.  Technique for simulating the steady-state response of power electronic converters , 2011 .

[20]  Suxuan Guo,et al.  Fast repetitive controller based low-voltage dynamic voltage restorer for voltage-quality issues in distribution system , 2010, The 2nd International Symposium on Power Electronics for Distributed Generation Systems.

[21]  A. Jalilian,et al.  Proportional-repetitive control of a dynamic voltage restorer (DVR) for power quality improvement , 2012, 2012 Proceedings of 17th Conference on Electrical Power Distribution.

[22]  K. M. Muttaqi,et al.  Characterizing voltage sags and swells using three-phase voltage ellipse parameters , 2014, 2014 IEEE Industry Application Society Annual Meeting.

[23]  Dong Chen,et al.  An Improved Repetitive Control Scheme for Grid-Connected Inverter With Frequency-Adaptive Capability , 2013, IEEE Transactions on Industrial Electronics.

[24]  J. Svensson.  Synchronisation methods for grid-connected voltage source converters , 2001 .

[25]  Euzeli Cipriano dos Santos,et al.  Digital-Scalar PWM Approaches Applied to Four-Leg Voltage-Source Inverters , 2013, IEEE Transactions on Industrial Electronics.