Solid-State Transformers for Distribution Systems–Part I: Technology and Construction

Solid-state transformers (SSTs) are an emerging technology that has been developed to improve the stability, reliability, and economic operation of distribution systems. These new transformers are composed of a medium ac voltage (MV) stage, a dc stage, and a low ac voltage (LV) stage. Passive and active dc links are used to construct the dc stage in SSTs in order to offer new functionalities, including hybrid (ac and dc) distribution, reactive power compensation, voltage/frequency regulation, power quality improvement, and distributed generation utilization. On one hand, a distribution SST has its ac stage connected to an MV level, which mandates specific power electronic converter (PEC) topologies, switching element capabilities, and filtering circuits. On the other hand, the dc-link stage has to provide isolation between the MV and LV levels, which requires the employment of isolated dc PECs. Part I of this work provides a review of SST designs and constructions (for deployment in distribution systems), in terms of the required technology, supported functionalities, and construction features.

[1]  L. Chang,et al.  Solid-State Transformers for Distribution Systems: Technology, Performance, and Challenges , 2019, 2019 IEEE/IAS 55th Industrial and Commercial Power Systems Technical Conference (I&CPS).

[2]  S. A. Saleh.  On the Design and Capacity of a Grounding Configuration for Grid-Connected DGUs , 2015, IEEE Transactions on Industry Applications.

[3]  Johann W. Kolar,et al.  Volume/weight/cost comparison of a 1MVA 10 kV/400 V solid-state against a conventional low-frequency distribution transformer , 2014, 2014 IEEE Energy Conversion Congress and Exposition (ECCE).

[4]  Marco Liserre,et al.  Sizing and SOC Management of a Smart-Transformer-Based Energy Storage System , 2018, IEEE Transactions on Industrial Electronics.

[5]  Jun-Young Lee,et al.  A 10-kW Two-Stage Isolated/Bidirectional DC/DC Converter With Hybrid-Switching Technique , 2013, IEEE Transactions on Industrial Electronics.

[6]  Zhaohui Wang,et al.  A Three-Phase Modular Multilevel DC–DC Converter for Power Electronic Transformer Applications , 2017, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[7]  Marco Liserre,et al.  Lifetime-Based Power Routing in Parallel Converters for Smart Transformer Application , 2018, IEEE Transactions on Industrial Electronics.

[8]  Marco Liserre,et al.  Concurrent Voltage Control and Dispatch of Active Distribution Networks by Means of Smart Transformer and Storage , 2018, IEEE Transactions on Industrial Electronics.

[9]  Yaow-Ming Chen,et al.  Multi-input DC/DC converter based on the multiwinding transformer for renewable energy applications , 2002 .

[10]  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.

[11]  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.

[12]  Peter E. Sutherland.  Application of transformer ground differential protection relays , 1999, 1999 IEEE Industrial and Commercial Power Systems Technical Conference (Cat. No.99CH36371).

[13]  Mario Schweizer.  System-oriented efficiency optimization of variable speed drives , 2012 .

[14]  Bjorn Gustavsen,et al.  Investigation of the Overvoltage and Fast Transient Phenomena on Transformer Terminals by Taking Into Account the Grounding Effects , 2015, IEEE Transactions on Industry Applications.

[15]  T. M. Jahns,et al.  Evolving and Emerging Applications of Power Electronics in Systems , 2013, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[16]  Marco Liserre,et al.  Reverse Power Flow Control in a ST-Fed Distribution Grid , 2018, IEEE Transactions on Smart Grid.

[17]  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.

[18]  Alex Q. Huang,et al.  System Integration and Hierarchical Power Management Strategy for a Solid-State Transformer Interfaced Microgrid System , 2014, IEEE Transactions on Power Electronics.

[19]  S. A. Saleh,et al.  The experimental performance of a multi-level AC-DC power electronic converter for PMG-based WECSs , 2017, 2017 IEEE/IAS 53rd Industrial and Commercial Power Systems Technical Conference (I&CPS).

[20]  Ned Mohan,et al.  A Single-Stage Solid-State Transformer for PWM AC Drive With Source-Based Commutation of Leakage Energy , 2015, IEEE Transactions on Power Electronics.

[21]  Zhijun Liu,et al.  Part II: Application Guidelines for High-Resistance Grounding of Low-Voltage Common AC-Bus and Common DC-Bus PWM Drive Systems , 2015, IEEE Transactions on Industry Applications.

[22]  Hao Chen,et al.  A 50-kVA Three-Phase Solid-State Transformer Based on the Minimal Topology: Dyna-C , 2016, IEEE Transactions on Power Electronics.

[23]  Ivo Barbi,et al.  Input-Series and Output-Series Connected Modular Output Capacitor Full-Bridge PWM DC–DC Converter , 2015, IEEE Transactions on Industrial Electronics.

[24]  Subhashish Bhattacharya,et al.  Solid-State Transformer and MV Grid Tie Applications Enabled by 15 kV SiC IGBTs and 10 kV SiC MOSFETs Based Multilevel Converters , 2015, IEEE Transactions on Industry Applications.

[25]  E. Ozkop,et al.  Multistage and Multilevel Power Electronic Converter-Based Power Supply for Plasma DBD Devices , 2018, IEEE Transactions on Industrial Electronics.

[26]  Subhashish Bhattacharya,et al.  Inductor design for high power applications with broad spectrum excitation , 1995 .

[27]  Johann W. Kolar,et al.  Comparative Evaluation of Three-Phase AC–AC Matrix Converter and Voltage DC-Link Back-to-Back Converter Systems , 2012, IEEE Transactions on Industrial Electronics.

[28]  T.-F. Wu,et al.  Grid-connected bi-directional modular multilevel converter with D-Σ digital control , 2017, 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia).

[29]  L. Chang,et al.  Impacts of Grounding Configurations on Responses of Ground Protective Relays for DFIG-Based WECSs—Part I: Solid Ground Faults , 2015, IEEE Transactions on Industry Applications.

[30]  R. Ayyanar,et al.  A DC–DC Multiport-Converter-Based Solid-State Transformer Integrating Distributed Generation and Storage , 2013, IEEE Transactions on Power Electronics.

[31]  H. Akagi,et al.  A Transformerless Energy Storage System Based on a Cascade Multilevel PWM Converter With Star Configuration , 2008, IEEE Transactions on Industry Applications.

[32]  Hani Vahedi,et al.  Five-Level Reduced-Switch-Count Boost PFC Rectifier With Multicarrier PWM , 2016, IEEE Transactions on Industry Applications.

[33]  Alex Q. Huang,et al.  Voltage and Power Balance Control for a Cascaded H-Bridge Converter-Based Solid-State Transformer , 2013, IEEE Transactions on Power Electronics.

[34]  Marco Liserre,et al.  Load control using sensitivity identification by means of smart transformer , 2017 .

[35]  Johann W. Kolar,et al.  Analysis of High-Efficiency Three-Phase Two- and Three-Level Unidirectional Hybrid Rectifiers , 2013, IEEE Transactions on Industrial Electronics.

[36]  B. M. Han,et al.  New Intelligent Semiconductor Transformer With Bidirectional Power-Flow Capability , 2014, IEEE Transactions on Power Delivery.

[37]  Jun-Young Lee,et al.  New Bidirectional Intelligent Semiconductor Transformer for Smart Grid Application , 2014, IEEE Transactions on Power Electronics.

[38]  Bin Wu,et al.  A multilevel buck converter based rectifier with sinusoidal inputs and unity power factor for medium voltage (4160-7200 V) applications , 2002 .

[39]  S. A. Saleh,et al.  Load Aggregation From Generation-Follows-Load to Load-Follows-Generation: Residential Loads , 2016, IEEE Transactions on Industry Applications.

[40]  Marco Liserre,et al.  The Smart Transformer: A solid-state transformer tailored to provide ancillary services to the distribution grid , 2017, IEEE Power Electronics Magazine.

[41]  J. Arrillaga,et al.  The Smoothing Transformer: A New Concept in DC Side Harmonic Reduction of HVDC Schemes , 1996, IEEE Power Engineering Review.

[42]  S. A. Saleh,et al.  Impacts of grounding configurations on responses of ground protective relays for DFIG-based WECSs-Part II: High-impedance ground faults , 2015, 2015 IEEE/IAS 51st Industrial & Commercial Power Systems Technical Conference (I&CPS).

[43]  W. H. Kersting,et al.  Grounded Wye-Delta Transformer Bank Backfeed Short-Circuit Currents , 2017, IEEE Transactions on Industry Applications.

[44]  Stefano Bifaretti,et al.  Advanced Power Electronic Conversion and Control System for Universal and Flexible Power Management , 2011, IEEE Transactions on Smart Grid.

[45]  Drazen Dujic,et al.  Power Electronic Traction Transformer: Efficiency Improvements Under Light-Load Conditions , 2014, IEEE Transactions on Power Electronics.

[46]  Wenping Cao,et al.  Design of a Modular, High Step-Up Ratio DC–DC Converter for HVDC Applications Integrating Offshore Wind Power , 2016, IEEE Transactions on Industrial Electronics.

[47]  M. L. Crow,et al.  Stability Design Criteria for Distribution Systems With Solid-State Transformers , 2014, IEEE Transactions on Power Delivery.

[48]  Marco Liserre,et al.  On-Line Load Sensitivity Identification in LV Distribution Grids , 2017, IEEE Transactions on Power Systems.

[49]  Jose Medina,et al.  Demand Response and Distribution Grid Operations: Opportunities and Challenges , 2010, IEEE Transactions on Smart Grid.

[50]  J. P. Nelson,et al.  System grounding and ground fault protection in the petrochemical industry: a need for a better understanding , 2001, Record of Conference Papers. IEEE incorporated Industry Applications Society. Forty-Eighth Annual Conference. 2001 Petroleum and Chemical Industry Technical Conference (Cat. No.01CH37265).

[51]  Pablo Lezana,et al.  Cascaded Multilevel Inverter With Regeneration Capability and Reduced Number of Switches , 2008, IEEE Transactions on Industrial Electronics.

[53]  Robert L. Smith.  Practical Low Voltage Equipment Ground Fault Protection for Solidly Grounded Systems with Wye-Connected Source Transformers , 1982, IEEE Transactions on Industry Applications.