An Asymptotically Stable Controller for Solid-State Transformers Based on Lyapunov Direct Stability Method

An asymptotically stable controller for solid-state transformers (SSTs) based on Lyapunov direct stability (LDS) method is presented in this study. The proposed controller has four control objectives for the SST application, which includes unity power factor at medium-voltage AC (VAC) side of the SST, constant DC-link voltage and constant output voltage magnitude and frequency at low-VAC side of the SST. To fulfil the above-mentioned objectives four control laws are derived from the Lyapunov function, directly. The proposed LDS-based controller is simulated using MATLAB/Simulink software. The obtained results indicate the fast and superior dynamic characteristics of the proposed controller. The LDS-based controller is comprehensive and can be adopted for the SST applications.

[1]  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.

[2]  Rahmat-Allah Hooshmand,et al.  Improving the Dynamic Performance of Distribution Electronic Power Transformers Using Sliding Mode Control , 2012 .

[3]  Tao Zhang,et al.  Sliding mode control of solid state transformer using a three-level hysteresis function , 2016 .

[4]  Johann W. Kolar,et al.  Optimum Number of Cascaded Cells for High-Power Medium-Voltage AC–DC Converters , 2017, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[5]  Hao Yuan,et al.  Research on voltage and power balance control for cascaded modular solid-state transformer , 2011, IEEE Transactions on Power Electronics.

[6]  Subhashish Bhattacharya,et al.  Modular Transformer Converter-Based Convertible Static Transmission Controller for Transmission Grid Management , 2014, IEEE Transactions on Power Electronics.

[7]  Yu Jiaqi,et al.  A Lyapunov stability theory-based control method for three-level shunt active power filter , 2016, 2016 35th Chinese Control Conference (CCC).

[8]  Weisheng Chen,et al.  Fuzzy-approximation-based global adaptive control for uncertain strict-feedback systems with a priori known tracking accuracy , 2015, Fuzzy Sets Syst..

[9]  Hasan Komurcugil,et al.  Lyapunov-based control for three-phase PWM AC/DC voltage-source converters , 1998 .

[10]  Johann W. Kolar,et al.  Solid-State Transformers: On the Origins and Evolution of Key Concepts , 2016, IEEE Industrial Electronics Magazine.

[11]  Weisheng Chen,et al.  Global Finite-Time Adaptive Stabilization of Nonlinearly Parametrized Systems With Multiple Unknown Control Directions , 2017, IEEE Transactions on Systems, Man, and Cybernetics: Systems.

[12]  S. D. Sudhoff,et al.  A Power Electronic-Based Distribution Transformer , 2002, IEEE Power Engineering Review.

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

[14]  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.

[15]  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.

[16]  Byung-Moon Han,et al.  Modularized Three-Phase Semiconductor Transformer with Bidirectional Power Flow for Medium Voltage Application , 2016 .

[17]  Xudong Zhao,et al.  Stabilization for a Class of Switched Nonlinear Systems With Novel Average Dwell Time Switching by T–S Fuzzy Modeling , 2016, IEEE Transactions on Cybernetics.

[18]  Weisheng Chen,et al.  Global finite-time adaptive stabilization for nonlinear systems with multiple unknown control directions , 2016, Autom..

[19]  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).

[20]  Ceyhun Yildiz,et al.  Optimal Control and Analysis of Three Phase Electronic Power Transformers , 2015 .

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

[22]  Xiaobo Li,et al.  Adaptive fuzzy control for full states constrained systems with nonstrict-feedback form and unknown nonlinear dead zone , 2017, Inf. Sci..

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

[24]  Peng Shi,et al.  Adaptive tracking control for switched stochastic nonlinear systems with unknown actuator dead-zone , 2015, Autom..

[25]  Weisheng Chen,et al.  Global adaptive neural control for strict-feedback time-delay systems with predefined output accuracy , 2015, Inf. Sci..

[26]  Ceyhun Yildiz,et al.  Performance analysis of electronic power transformer based on neuro-fuzzy controller , 2016, SpringerPlus.

[27]  Kai Zhang,et al.  Large- and Small-Signal Average-Value Modeling of Dual-Active-Bridge DC–DC Converter Considering Power Losses , 2017, IEEE Transactions on Power Electronics.

[28]  Hamzeh Beiranvand,et al.  General Relativity Search Algorithm: A Global Optimization Approach , 2015, Int. J. Comput. Intell. Appl..

[29]  Juan A. Martinez-Velasco,et al.  A Solid State Transformer model for power flow calculations , 2017 .

[30]  Shu Fan,et al.  Theory and application of distribution electronic power transformer , 2007 .

[31]  Hasan Komurcugil,et al.  A new control strategy for single-phase shunt active power filters using a Lyapunov function , 2006, IEEE Transactions on Industrial Electronics.

[32]  Marco Liserre,et al.  Load Control Using Sensitivity Identification by Means of Smart Transformer , 2018, IEEE Transactions on Smart Grid.

[33]  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.

[34]  Nicola Schulz,et al.  Potential of solid-state transformers for grid optimization in existing low-voltage grid environments , 2017 .