Voltage control of a single distributed generation unite in autonomous mode operation under unbalance and non-linear load conditions

This paper propose a voltage control of a single distributed generation (DG) unit powered local load. The DG system utilizes three phase four wire voltage source inverter VSI with split DC link as the medium interface and LC filter to attenuate the switching frequency harmonics, A dual loop scheme is employed. Dead beat current controller in inner loop, which achieve fast dynamic response. In the outer loop, Multi-generalized resonant filter with feedback state is employed to track reference voltage and eliminate the low order harmonics, and to make the dynamic of the system greatly adjustable via pole-placement strategy. The proposed controller provides a set balanced three phase voltage with low THD equal to 1.80% in worse case (non linear load) for a locale load, despite unbalanced and distorted current load, guarantee a robust stability, fast dynamic response to disturbance, zero study state error. Effectiveness of the proposed control strategy is evaluated based on time domain simulation studies in Matlab/Simulink™ environment.

[1]  Reza Iravani,et al.  Robust Control of an Autonomous Four-Wire Electronically-Coupled Distributed Generation Unit , 2011, IEEE Transactions on Power Delivery.

[2]  Donald Grahame Holmes,et al.  Stationary frame current regulation of PWM inverters with zero steady-state error , 2003 .

[3]  Kai Jia,et al.  Research on the power electronic load based on repetitive controller , 2008, 2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition.

[4]  Keliang Zhou,et al.  Zero-phase odd-harmonic repetitive controller for a single-phase PWM inverter , 2006, IEEE Transactions on Power Electronics.

[5]  Paulson Samuel,et al.  Grid interface of photovoltaic-micro turbine hybrid based power for voltage support and control using VSI in rural applications , 2009, 2009 IEEE Power & Energy Society General Meeting.

[6]  A. Yazdani.  Control of an islanded Distributed Energy Resource unit with load compensating feed-forward , 2008, 2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century.

[7]  Jin-Woo Jung,et al.  A Three-Phase Four-Wire Inverter Control Technique for a Single Distributed Generation Unit in Island Mode , 2008, IEEE Transactions on Power Electronics.

[8]  M B Delghavi,et al.  Islanded-Mode Control of Electronically Coupled Distributed-Resource Units Under Unbalanced and Nonlinear Load Conditions , 2011, IEEE Transactions on Power Delivery.

[9]  S. J. Chiang,et al.  H/sub /spl infin// loop-shaping controller designs for the single-phase UPS inverters , 2001 .

[10]  Zainal Salam,et al.  APPLICATION OF DECOUPLING NETWORKS IN DEADBEAT CONTROLLER FOR HIGH-FREQUENCY LINK INVERTER , 2006 .

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

[12]  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).

[13]  O. Curea,et al.  An Innovative VSI Controller for the Generation of Balanced Voltage in Spite of the Presence of Unbalanced Loads , 2007, 2007 American Control Conference.

[14]  S. Buso,et al.  A Line-Interactive Single-Phase to Three-Phase Converter System , 2004, IEEE Transactions on Power Electronics.

[15]  V.F. Montagner,et al.  State feedback control for tracking sinusoidal references with rejection of disturbances applied to UPS systems , 2009, 2009 35th Annual Conference of IEEE Industrial Electronics.

[16]  W. Wonham,et al.  The internal model principle for linear multivariable regulators , 1975 .

[17]  Jian-Shiang Chen,et al.  UPS inverter design using discrete-time sliding-mode control scheme , 2002, IEEE Trans. Ind. Electron..

[18]  Ahmad Radan,et al.  Adaptive robust pole-placement control of 4-leg voltage-source inverters for standalone photovoltaic systems: Considering digital delays , 2011 .

[19]  Fernando Briz,et al.  An improved control scheme based in droop characteristic for microgrid converters , 2010 .

[20]  P. Garcia-Gonzalez,et al.  Application of a Repetitive Controller for a Three-Phase Active Power Filter , 2007, IEEE Transactions on Power Electronics.

[21]  Po-Tai Cheng,et al.  Experimental verification of dominant harmonic active filter (DHAF) for high power applications , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).