A Unified Control Structure for Grid Connected and Islanded Mode of Operation of Voltage Source Converter Based Distributed Generation Units Under Unbalanced and Non-Linear Conditions

This manuscript develops a unified control structure for Distributed Generation (DG) units based on Voltage Source Converters considering unbalanced and non-linear operating conditions. This control structure works for both the Islanded and the Grid-connected modes of operation of the Micro-Grid (MG). The objective of this control scheme is to regulate the line currents of the DG unit in such a manner that the voltage at the Point of Common Coupling (PCC) remains balanced despite the line currents of the DG unit being unbalanced and distorted. Multiple adaptive P-R controllers have been proposed for the current control loop of the Voltage Source Converter (VSC). These controllers have been implemented with resettable integrators so as to limit the DC components in the post fault current of the VSC. The Battery Energy Storage System (BESS) is interfaced to the DC link of the VSC through bi-directional dc-dc converters. An improved control structure for the bi-directional dc-dc converter has been developed. The effectiveness of these control structures have been presented and tested in PSCAD/EMTDC in an IEEE 34 node distribution system model being fed by two identical DG units.

[1]  Antonella Ferrara,et al.  Design of Robust Higher Order Sliding Mode Control for Microgrids , 2015, IEEE Journal on Emerging and Selected Topics in Circuits and Systems.

[2]  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.

[3]  S. C. Srivastava,et al.  Control Strategies of a DC Microgrid for Grid Connected and Islanded Operations , 2015, IEEE Transactions on Smart Grid.

[4]  Marco Liserre,et al.  Grid Converters for Photovoltaic and Wind Power Systems , 2011 .

[5]  Osama A. Mohammed,et al.  Control of a Hybrid AC/DC Microgrid Involving Energy Storage and Pulsed Loads , 2017, IEEE Transactions on Industry Applications.

[6]  Abhisek Ukil,et al.  DC grid voltage regulation using new HESS control strategy , 2017, 2017 IEEE Power & Energy Society General Meeting.

[7]  Yonggang Peng,et al.  Power Management for a Hybrid AC/DC Microgrid With Multiple Subgrids , 2018, IEEE Transactions on Power Electronics.

[8]  R. Iravani,et al.  Control of an Electronically-Coupled Distributed Resource Unit Subsequent to an Islanding Event , 2008, IEEE Transactions on Power Delivery.

[9]  Min Chen,et al.  Accurate electrical battery model capable of predicting runtime and I-V performance , 2006, IEEE Transactions on Energy Conversion.

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

[11]  Li Wang,et al.  Integration of Wind Power and Wave Power Generation Systems Using a DC Microgrid , 2015, IEEE Transactions on Industry Applications.

[12]  A. Yazdani,et al.  A Unified Control Strategy for Electronically Interfaced Distributed Energy Resources , 2012, IEEE Transactions on Power Delivery.

[13]  Amirnaser Yazdani,et al.  Fractional-Order Sliding-Mode Control of Islanded Distributed Energy Resource Systems , 2016, IEEE Transactions on Sustainable Energy.

[14]  N. L. Narasamma,et al.  Design and Analysis of Novel Control Strategy for Battery and Supercapacitor Storage System , 2014, IEEE Transactions on Sustainable Energy.

[15]  H. Stemmler,et al.  Stationary frame generalized integrators for current control of active power filters with zero steady state error for current harmonics of concern under unbalanced and distorted operation conditions , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[16]  Nikos D. Hatziargyriou,et al.  Microgrids : architectures and control , 2014 .

[17]  Mansour Tabari,et al.  Stability of a dc Distribution System for Power System Integration of Plug-In Hybrid Electric Vehicles , 2014, IEEE Transactions on Smart Grid.

[18]  S. B. Kjaer,et al.  Evaluation of the “Hill Climbing” and the “Incremental Conductance” Maximum Power Point Trackers for Photovoltaic Power Systems , 2012, IEEE Transactions on Energy Conversion.

[19]  Mehdi Savaghebi,et al.  Autonomous Voltage Unbalance Compensation in an Islanded Droop-Controlled Microgrid , 2013, IEEE Transactions on Industrial Electronics.

[20]  Weidong Xiao,et al.  A Parameterization Approach for Enhancing PV Model Accuracy , 2013, IEEE Transactions on Industrial Electronics.

[21]  Chandan Chakraborty,et al.  New Voltage Control Strategies for VSC-Based DG Units in an Unbalanced Microgrid , 2017, IEEE Transactions on Sustainable Energy.

[22]  Reza Iravani,et al.  Voltage-Sourced Converters in Power Systems: Modeling, Control, and Applications , 2010 .

[23]  R. Teodorescu,et al.  On the Perturb-and-Observe and Incremental Conductance MPPT Methods for PV Systems , 2013, IEEE Journal of Photovoltaics.

[24]  Mansour Tabari,et al.  A Mathematical Model for Stability Analysis of a DC Distribution System for Power System Integration of Plug-In Electric Vehicles , 2015, IEEE Transactions on Vehicular Technology.

[25]  Alon Kuperman,et al.  Proportional-Resonant Current Controllers Design Based on Desired Transient Performance , 2015, IEEE Transactions on Power Electronics.