Management of reactive power sharing & power quality improvement with SRF-PAC based UPQC under unbalanced source voltage condition

Abstract This paper is proposed to establish a new control algorithm for UPQC (unified power quality conditioner) to improve power quality and manage effectively equal reactive power sharing between shunt and series inverter of UPQC under unbalanced source voltage condition. The extraction of instantaneous power angle for reactive power sharing faces difficulty with unbalanced source voltage condition. This paper presents a new SRF (synchronous reference frame) based PAC (power angle control) method using decoupled load current parameters for efficient utilization and coordination of UPQC inverters. The proposed controller contributes in improvement of source current and load voltage harmonic profile, provides efficient way of load reactive power compensation and load voltage compensation for sag, swell and unbalanced condition. Effect of source voltage variations in the form of sag, swell or unbalancing on variable power angle estimation and reactive power calculations are also validated through a mathematical analysis. SRF based PAC control approach and PAC based UVT (unit vector template) control approach is adapted for estimating the reference signals of shunt and series inverter respectively and thus reducing the need of extra computation. The simulation and experimental analysis is carried out using Matlab/Simulink software package for computer simulation and a dSPACE based experimental setup for real time verifications.

[1]  Sanjib Ganguly.  Unified power quality conditioner allocation for reactive power compensation of radial distribution networks , 2014 .

[2]  Kamal Al-Haddad,et al.  Power Quality: Problems and Mitigation Techniques , 2014 .

[3]  Vinicius Dario Bacon,et al.  A Versatile Unified Power Quality Conditioner Applied to Three-Phase Four-Wire Distribution Systems Using a Dual Control Strategy , 2016, IEEE Transactions on Power Electronics.

[4]  Hirofumi Akagi,et al.  The unified power quality conditioner: the integration of series- and shunt-active filters , 1998 .

[5]  Anup Kumar Panda,et al.  Performance analysis of a 3 phase 4 wire UPQC system based on PAC based SRF controller with real time digital simulation , 2016 .

[6]  Y.Y. Kolhatkar,et al.  Experimental Investigation of a Single-Phase UPQC With Minimum VA Loading , 2007, IEEE Transactions on Power Delivery.

[7]  M. Machmoum,et al.  Simplified Analogical Control of a Unified Power Quality Conditioner , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[8]  Engin Özdemir,et al.  Synchronous-Reference-Frame-Based Control Method for UPQC Under Unbalanced and Distorted Load Conditions , 2011, IEEE Transactions on Industrial Electronics.

[9]  Pramod Agarwal,et al.  Compensation of voltage flicker using Unified Power Quality Conditioner (UPQC) , 2014, 2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES).

[10]  A. Baggini,et al.  Power quality , 2004, Proceedings. 2004 First International Conference on Power Electronics Systems and Applications, 2004..

[11]  Mahesh Kumar Mishra,et al.  Minimization of VA loading of Unified Power Quality Conditioner (UPQC) , 2009, 2009 International Conference on Power Engineering, Energy and Electrical Drives.

[12]  Kamal Al-Haddad,et al.  A review of active filters for power quality improvement , 1999, IEEE Trans. Ind. Electron..

[13]  Ambrish Chandra,et al.  Power quality enhancement utilising single-phase unified power quality conditioner : digital signal processor-based experimental validation , 2011 .

[14]  V. Khadkikar,et al.  Enhancing Electric Power Quality Using UPQC: A Comprehensive Overview , 2012, IEEE Transactions on Power Electronics.

[15]  Malabika Basu,et al.  A 12-kVA DSP-Controlled Laboratory Prototype UPQC Capable of Mitigating Unbalance in Source Voltage and Load Current , 2010, IEEE Transactions on Power Electronics.

[16]  Mahesh K. Mishra,et al.  Effective utilization of unified power quality conditioner for interconnecting PV modules with grid using power angle control method , 2013 .

[17]  A. Chandra,et al.  A simple new control technique for unified power quality conditioner (UPQC) , 2004, 2004 11th International Conference on Harmonics and Quality of Power (IEEE Cat. No.04EX951).

[18]  Robert Kohl,et al.  Power Electronics Handbook , 2016 .

[19]  T. Aruldoss Albert Victoire,et al.  Enhanced PLL based SRF control method for UPQC with fault protection under unbalanced load conditions , 2014 .

[20]  Ambrish Chandra,et al.  A Novel Structure for Three-Phase Four-Wire Distribution System Utilizing Unified Power Quality Conditioner (UPQC) , 2006 .

[21]  Ambrish Chandra,et al.  UPQC-S: A Novel Concept of Simultaneous Voltage Sag/Swell and Load Reactive Power Compensations Utilizing Series Inverter of UPQC , 2011, IEEE Transactions on Power Electronics.

[22]  Valentin Navrapescu,et al.  Single-Phase Unified Power Quality Conditioner with Optimum Voltage Angle Injection for Minimum VA requirement , 2007, 2007 IEEE International Symposium on Industrial Electronics.

[23]  Malabika Basu,et al.  Investigation on the performance of UPQC-Q for voltage sag mitigation and power quality improvement at a critical load point , 2008 .

[24]  A. Chandra,et al.  A New Control Philosophy for a Unified Power Quality Conditioner (UPQC) to Coordinate Load-Reactive Power Demand Between Shunt and Series Inverters , 2008, IEEE Transactions on Power Delivery.

[25]  Sule Ozdemir,et al.  3-Phase 4-leg unified series–parallel active filter system with ultracapacitor energy storage for unbalanced voltage sag mitigation , 2013 .

[26]  E.R. Cadaval,et al.  Comparison of Control Strategies for Shunt Active Power Filters in Three-Phase Four-Wire Systems , 2007, IEEE Transactions on Power Electronics.

[27]  Malabika Basu,et al.  Performance study of UPQC-Q for load compensation and voltage sag mitigation , 2002, IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02.

[28]  Ambrish Chandra,et al.  Analysis of Power Flow in UPQC during Voltage Sag and Swell Conditions for Selection of Device Ratings , 2006, 2006 Canadian Conference on Electrical and Computer Engineering.

[29]  Anup Kumar Panda,et al.  Comparative analysis on a shunt active power filter with different control strategies for composite loads , 2014, TENCON 2014 - 2014 IEEE Region 10 Conference.

[30]  Gil D. Marques,et al.  An instantaneous active and reactive current component method for active filters , 2000 .

[31]  Metin Kesler,et al.  A novel control method for unified power quality conditioner (UPQC) under non-ideal mains voltage and unbalanced load conditions , 2010, 2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[32]  B. Han,et al.  New configuration of UPQC for medium-voltage application , 2006, IEEE Transactions on Power Delivery.

[33]  Bhim Singh,et al.  A comparative analysis of different magnetics supported three-phase four-wire unified power quality conditioners – A simulation study , 2013 .

[34]  Sanjib Ganguly.  Impact of Unified Power-Quality Conditioner Allocation on Line Loading, Losses, and Voltage Stability of Radial Distribution Systems , 2014, IEEE Transactions on Power Delivery.

[35]  Anup Kumar Panda,et al.  Power quality enhancement with PAC-SRF based single phase UPQC under non-ideal source voltage , 2015, 2015 Annual IEEE India Conference (INDICON).

[36]  Sanjib Ganguly,et al.  Multi-Objective Planning for Reactive Power Compensation of Radial Distribution Networks With Unified Power Quality Conditioner Allocation Using Particle Swarm Optimization , 2014, IEEE Transactions on Power Systems.