A Vector-controlled Single-phase Voltage Source Inverter Based Grid Interface Suitable for Variable Frequency Operation in Autonomous Microgrids

Abstract Vector (dq) control is a powerful technique used in high dynamic performance inverters. The transformation of AC into DC quantities allows one to get zero steady-state error for AC currents and voltages with simple proportional integrator type controllers. It can easily be implemented for three-phase inverters but presents some challenges for single-phase ones. The orthogonal component (β) required for the stationary to rotating frame transformation is usually created by phase shifting the real one (α) by one-quarter of a line cycle, which deteriorates the dynamic response. The emulation of a fictive orthogonal circuit for obtaining the β current component has been shown to yield enhanced transient response. This article shows that the dynamic response of vector-controlled single-phase inverters implemented with orthogonal circuit emulation is identical to that of a three-phase inverter. This concept is then extended for operation with variable grid frequencies, a condition that can be found in photovoltaic hybrid autonomous microgrids, where the grid frequency is used for energy management purposes. The effectiveness of this technique is demonstrated by means of simulation and experimental results.

[1]  Pablo Lezana,et al.  Predictive Current Control of a Voltage Source Inverter , 2004, IEEE Transactions on Industrial Electronics.

[2]  Donald Grahame Holmes,et al.  Grid current regulation of a three-phase voltage source inverter with an LCL input filter , 2003 .

[3]  Dushan Boroyevich,et al.  A D-Q Frame Controller for a Full-Bridge Single Phase Inverter Used in Small Distributed Power Generation Systems , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[4]  Josep M. Guerrero,et al.  Wireless-control strategy for parallel operation of distributed generation inverters , 2006, Proceedings of the IEEE International Symposium on Industrial Electronics, 2005. ISIE 2005..

[5]  Frede Blaabjerg,et al.  Multiresonant Frequency-Locked Loop for Grid Synchronization of Power Converters Under Distorted Grid Conditions , 2011, IEEE Transactions on Industrial Electronics.

[6]  Alfred Rufer,et al.  Vector control of single-phase voltage source converters based on Fictive Axis Emulation , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[7]  Richard S. Zhang,et al.  A grid simulator with control of single-phase power converters in D-Q rotating frame , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[8]  Milan M. Jovanovic,et al.  State-of-the-art, single-phase, active power-factor-correction techniques for high-power applications - an overview , 2005, IEEE Transactions on Industrial Electronics.

[9]  Alfred Rufer,et al.  A vector controlled single-phase voltage source inverter with enhanced dynamic response , 2010, 2010 IEEE International Symposium on Industrial Electronics.

[10]  Quan Li,et al.  A Review of the Single Phase Photovoltaic Module Integrated Converter Topologies With Three Different DC Link Configurations , 2008, IEEE Transactions on Power Electronics.

[11]  R. Teodorescu,et al.  A Stationary Reference Frame Grid Synchronization System for Three-Phase Grid-Connected Power Converters Under Adverse Grid Conditions , 2012, IEEE Transactions on Power Electronics.

[12]  J. Salaet,et al.  Comparison between two methods of DQ transformation for single phase converters control. Application to a 3-level boost rectifier , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[13]  Frede Blaabjerg,et al.  Proportional-resonant controllers and filters for grid-connected voltage-source converters , 2006 .

[14]  B.K. Bose,et al.  A Simple Full Digital Adaptive Current Hysteresis Control with Constant Modulation Frequency for Active Power Filters , 2007, 2007 IEEE Industry Applications Annual Meeting.

[15]  M.R. Iravani,et al.  Power Management Strategies for a Microgrid With Multiple Distributed Generation Units , 2006, IEEE Transactions on Power Systems.

[16]  Donald Grahame Holmes,et al.  Stationary frame current regulation of PWM inverters with zero steady state error , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[17]  Il-Yop Chung,et al.  Control Methods of Inverter-Interfaced Distributed Generators in a Microgrid System , 2010, IEEE Transactions on Industry Applications.

[18]  Marian P. Kazmierkowski,et al.  Current control techniques for three-phase voltage-source PWM converters: a survey , 1998, IEEE Trans. Ind. Electron..

[19]  Ehab F. El-Saadany,et al.  An Improved Deadbeat Current Control Scheme With a Novel Adaptive Self-Tuning Load Model for a Three-Phase PWM Voltage-Source Inverter , 2007, IEEE Transactions on Industrial Electronics.

[20]  Hirofumi Akagi,et al.  Active Harmonic Filters , 2005, Proceedings of the IEEE.

[21]  Frede Blaabjerg,et al.  Overview of Control and Grid Synchronization for Distributed Power Generation Systems , 2006, IEEE Transactions on Industrial Electronics.

[22]  Liu Ping,et al.  For prototype super-conducting magnetic energy storage (SMES) [voltage source convertor control scheme] , 2000, Proceedings IPEMC 2000. Third International Power Electronics and Motion Control Conference (IEEE Cat. No.00EX435).

[23]  M. Aredes,et al.  A DQ Synchronous Reference Frame Current Control for Single-Phase Converters , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[24]  A. Mohd,et al.  Control strategy and space vector modulation for three-leg four-wire voltage source inverters under unbalanced load conditions , 2010 .

[25]  Rae-Young Kim,et al.  Instantaneous control of average power for grid tie inverter using single phase D-Q rotating frame with all pass filter , 2004, 30th Annual Conference of IEEE Industrial Electronics Society, 2004. IECON 2004.

[26]  N. Hatziargyriou,et al.  Microgrids: an overview of ongoing research, development, anddemonstration projects , 2007 .

[27]  B. Saritha,et al.  Observer based current control of single-phase inverter in DQ rotating frame , 2006, 2006 International Conference on Power Electronic, Drives and Energy Systems.