Overload Control in Smart Transformer-Fed Grid

Renewable energy resources and new loads—such as electric vehicles—challenge grid management. Among several scenarios, the smart transformer represents a solution for simultaneously managing low- and medium-voltage grids, providing ancillary services to the distribution grid. However, unlike conventional transformers, the smart transformer has a very limited overload capability, because the junction temperature—which must always be below its maximum limit—is characterized by a short time constant. In this work, an overload control for smart transformer by means of voltage and frequency variations has been proposed and verified by means of simulations and experiments.

[1]  Marco Liserre,et al.  The Smart Transformer: Impact on the Electric Grid and Technology Challenges , 2016, IEEE Industrial Electronics Magazine.

[2]  Marija D. Ilic,et al.  Network Impacts and Cost Savings of Controlled EV Charging , 2012, IEEE Transactions on Smart Grid.

[3]  G. Swift,et al.  Transient transformer overload ratings and protection , 2004, IEEE Electrical Insulation Magazine.

[4]  Marco Liserre,et al.  Analysis of the frequency-based control of a master/slave micro-grid , 2016 .

[5]  Marco Liserre,et al.  On-line load sensitivity identification in LV distribution grids , 2017, 2017 IEEE Power & Energy Society General Meeting.

[6]  Marco Liserre,et al.  Coordinated frequency and Voltage Overload Control of Smart Transformers , 2015, 2015 IEEE Eindhoven PowerTech.

[7]  Josep M. Guerrero,et al.  Voltage-Based Control of a Smart Transformer in a Microgrid , 2013, IEEE Transactions on Industrial Electronics.

[8]  Alex Q. Huang,et al.  On Integration of Solid-State Transformer With Zonal DC Microgrid , 2012, IEEE Transactions on Smart Grid.

[9]  Johann W. Kolar,et al.  Protection of MV Converters in the Grid: The Case of MV/LV Solid-State Transformers , 2017, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[10]  Rolando Burgos,et al.  Review of Solid-State Transformer Technologies and Their Application in Power Distribution Systems , 2013, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[11]  Jianhui Wang,et al.  Review on Implementation and Assessment of Conservation Voltage Reduction , 2014, IEEE Transactions on Power Systems.

[12]  Ruchi Singh,et al.  Evaluation of Conservation Voltage Reduction (CVR) on a National Level , 2010 .

[13]  V. Vittal,et al.  Risk Assessment for Transformer Loading , 2001, IEEE Power Engineering Review.

[14]  Alex Q. Huang,et al.  Medium-Voltage Solid-State Transformer: Technology for a Smarter and Resilient Grid , 2016, IEEE Industrial Electronics Magazine.

[15]  Marco Liserre,et al.  Improving photovoltaic and electric vehicle penetration in distribution grids with smart transformer , 2013, IEEE PES ISGT Europe 2013.

[16]  Ryan Liu,et al.  A survey of PEV impacts on electric utilities , 2011, ISGT 2011.

[17]  Marco Liserre,et al.  Load control using sensitivity identification by means of smart transformer , 2017, 2017 IEEE Power & Energy Society General Meeting.

[18]  Hui Li,et al.  A Novel Hierarchical Section Protection Based on the Solid State Transformer for the Future Renewable Electric Energy Delivery and Management (FREEDM) System , 2013, IEEE Transactions on Smart Grid.

[19]  Alex Q. Huang,et al.  Power Management for DC Microgrid Enabled by Solid-State Transformer , 2014, IEEE Transactions on Smart Grid.

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

[21]  Marco Liserre,et al.  Frequency-Based Overload Control of Smart Transformers , 2015, 2015 IEEE Eindhoven PowerTech.

[22]  Subhashish Bhattacharya,et al.  Overloading and overvoltage evaluation of a Transformerless Intelligent Power Substation , 2013, 2013 IEEE Power & Energy Society General Meeting.