Stability enhancement of a hybrid micro-grid system in grid fault condition

Low voltage ride through capability augmentation of a hybrid micro-grid system is presented in this paper which reflects enhanced reliability in the system. The control scheme involves parallel connected multiple ac-dc bidirectional converters. When the micro-grid system is subjected to a severe voltage dip by any transient fault single power converter may not be able to provide necessary reactive power to overcome the severe voltage dip. This paper discusses the control strategy of additional power converter connected in parallel with main converter to support extra reactive power to withstand the severe voltage dip. During transient fault, when the terminal voltage crosses 90% of its pre-fault value, additional converter comes into operation. With the help of additional power converter, the micro-grid system withstands the severe voltage fulfilling the grid code requirements. This multiple converter scheme provides the micro-grid system the capability of low voltage ride through which makes the system more reliable and stable.

[1]  Toshiaki Murata,et al.  Comparative study on transient stability analysis of wind turbine generator system using different drive train models , 2007 .

[2]  Bill Rose,et al.  Microgrids , 2018, Smart Grids.

[3]  G. Vachtsevanos,et al.  A Hybrid Photovoltaic Simulator for Utility Interactive Studies , 1987, IEEE Power Engineering Review.

[4]  Ahmed Al-Durra,et al.  Islanding operation of hybrid micro-grid system with power management control scheme , 2012 .

[5]  Jon Are Suul,et al.  Low Voltage Ride Through of Wind Farms With Cage Generators: STATCOM Versus SVC , 2008, IEEE Transactions on Power Electronics.

[6]  Junji Tamura,et al.  A New Control Method for Wind Energy Conversion System Using a Doubly-Fed Synchronous Generator , 2006 .

[7]  Frede Blaabjerg,et al.  Transient stability of DFIG wind turbines at an external short‐circuit fault , 2005 .

[8]  Ricardo J. Mantz,et al.  Wind farm non-linear control for damping electromechanical oscillations of power systems , 2008 .

[9]  S. M. Muyeen,et al.  Stability Augmentation of a Grid-connected Wind Farm , 2008 .

[10]  J. F. Conroy,et al.  Low-voltage ride-through of a full converter wind turbine with permanent magnet generator , 2007 .

[11]  Surya Santoso,et al.  Fundamental time–domain wind turbine models for wind power studies , 2007 .

[12]  Junji Tamura,et al.  Participation of facts in stabilizing DFIG with crowbar during grid fault based on grid codes , 2011, 2011 IEEE GCC Conference and Exhibition (GCC).

[13]  G. Joos,et al.  Effect of low voltage ride through (LVRT) characteristic on voltage stability , 2005, IEEE Power Engineering Society General Meeting, 2005.

[14]  Hung-Cheng Chen,et al.  Dynamic Modeling and Simulation of Hybrid Power Systems Based on Renewable Energy , 2009, 2009 International Conference on Energy and Environment Technology.

[15]  Poh Chiang Loh,et al.  A hybrid AC/DC micro-grid , 2010, 2010 Conference Proceedings IPEC.

[16]  Ahmed Al-Durra,et al.  Centralized power control strategy for AC-DC hybrid micro-grid system using multi-converter scheme , 2011, IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society.

[17]  Jan F. Kreider,et al.  Distributed Generation : The Power Paradigm for the New Millennium , 2001 .

[18]  M. J. Khan,et al.  Dynamic modeling and simulation of a small wind–fuel cell hybrid energy system , 2005 .

[19]  Peng Wang,et al.  A Hybrid AC/DC Microgrid and Its Coordination Control , 2011, IEEE Transactions on Smart Grid.

[20]  Junji Tamura,et al.  Stabilization of wind farms by DFIG-based variable speed wind generators , 2010, 2010 International Conference on Electrical Machines and Systems.

[21]  Junji Tamura,et al.  Comparative study between two protection schemes for DFIG-based wind generator , 2010, 2010 International Conference on Electrical Machines and Systems.

[22]  M. Poloujadoff,et al.  A Complete Analytical Theory of Self controlled Inverter Fed Synchronous Machine , 1981, IEEE Transactions on Power Apparatus and Systems.