Decentralized Sliding Mode Control of WG/PV/FC Microgrids Under Unbalanced and Nonlinear Load Conditions for On- and Off-Grid Modes

This paper presents a new decentralized robust power/current/voltage/frequency control strategy for islanded and grid-connected modes to enhance power-sharing and small- and large-signal stability of a wind/photovoltaic/fuel cell microgrid and improve its performance for nonlinear and unbalanced loads. First, the distributed energy resources are modeled for unbalanced voltage condition. Then, in order to improve power sharing, regulate voltage and active/reactive powers injected by these resources, and moreover, harmonic and negative-sequence current control in the presence of nonlinear and unbalanced loads, three separate controllers for positive-sequence voltage and power control and negative sequence current control are designed based on the sliding mode control, Lyapunov function theory, and fractional-order sliding mode control, respectively. The theoretical concept of the proposed control strategy, including the mathematical modeling of microgrid components, basic theorems, controller design procedure, and robustness/closed-loop stability analysis, is outlined. Also, this direct power/current/voltage/frequency control scheme is governed by a hierarchical control scheme that exploits a voltage compensation scheme and harmonic virtual impedance loop. To show the effectiveness of the proposed control scheme, offline time-domain simulation studies are performed on a wind/photovoltaic/fuel cell microgrid with nonlinear and unbalanced loads in MATLAB/Simulink environment and the results are verified by OPAL-RT real-time digital simulator.

[1]  Heidar Ali Talebi,et al.  A Decentralized Power Management and Sliding Mode Control Strategy for Hybrid AC/DC Microgrids including Renewable Energy Resources , 2017 .

[2]  Mohsen Hamzeh,et al.  Active Power Management of Multihybrid Fuel Cell/Supercapacitor Power Conversion System in a Medium Voltage Microgrid , 2012, IEEE Transactions on Smart Grid.

[3]  Frede Blaabjerg,et al.  An Enhanced Islanding Microgrid Reactive Power, Imbalance Power, and Harmonic Power Sharing Scheme , 2015, IEEE Transactions on Power Electronics.

[4]  Hamid Reza Baghaee,et al.  Optimal Sizing of a Stand-alone Wind/Photovoltaic Generation Unit using Particle Swarm Optimization , 2009, Simul..

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

[6]  Nasser Sadati,et al.  Fully Distributed Cooperative Secondary Frequency and Voltage Control of Islanded Microgrids , 2017, IEEE Transactions on Energy Conversion.

[7]  Nasim Ullah,et al.  Fractional order control of static series synchronous compensator with parametric uncertainty , 2017 .

[8]  Jiann-Fuh Chen,et al.  Digital-signal-processor-based DC/AC inverter with integral-compensation terminal sliding-mode control , 2011 .

[9]  Lei Shang,et al.  Sliding-Mode-Based Direct Power Control of Grid-Connected Wind-Turbine-Driven Doubly Fed Induction Generators Under Unbalanced Grid Voltage Conditions , 2012, IEEE Transactions on Energy Conversion.

[10]  Hamid Reza Baghaee,et al.  Performance Improvement of Multi-DER Microgrid for Small- and Large-Signal Disturbances and Nonlinear Loads: Novel Complementary Control Loop and Fuzzy Controller in a Hierarchical Droop-Based Control Scheme , 2018, IEEE Systems Journal.

[11]  Alain Oustaloup,et al.  Frequency-band complex noninteger differentiator: characterization and synthesis , 2000 .

[12]  Mehrdad Abedi,et al.  Calculation of weighting factors of static security indices used in contingency ranking of power systems based on fuzzy logic and analytical hierarchy process , 2011 .

[13]  Ying Luo,et al.  Fractional order sliding-mode control based on parameters auto-tuning for velocity control of permanent magnet synchronous motor. , 2012, ISA transactions.

[14]  Edward J. Davison,et al.  A Generalized Decentralized Robust Control of Islanded Microgrids , 2014, IEEE Transactions on Power Systems.

[15]  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.

[16]  Alexander G. Loukianov,et al.  Multimachine Power-System Control: Integral-SM Approach , 2009, IEEE Transactions on Industrial Electronics.

[17]  Josep M. Guerrero,et al.  Microgrid Stability Controller Based on Adaptive Robust Total SMC , 2015 .

[18]  Heidar Ali Talebi,et al.  A generalized descriptor-system robust H∞ control of autonomous microgrids to improve small and large signal stability considering communication delays and load nonlinearities , 2017 .

[19]  Raymundo E. Torres-Olguin,et al.  A Repetitive-Based Controller for the Compensation of $6\ell\pm 1$ Harmonic Components , 2008, IEEE Transactions on Industrial Electronics.

[20]  Caisheng Wang,et al.  Modeling and control of hybrid wind/photovoltaic/fuel cell distributed generation systems , 2006 .

[21]  J. Usaola,et al.  A new balanced harmonic load flow including nonlinear loads modeled with RBF networks , 2004, IEEE Transactions on Power Delivery.

[22]  M. Karrari,et al.  Application of Duffing Oscillators for Passive Islanding Detection of Inverter-Based Distributed Generation Units , 2012, IEEE Transactions on Power Delivery.

[23]  Paolo Mattavelli,et al.  An Adaptive Control for UPS to Compensate Unbalance and Harmonic Distortion Using a Combined Capacitor/Load Current Sensing , 2007, IEEE Transactions on Industrial Electronics.

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

[25]  G. B. Gharehpetian,et al.  Accurate SFS Parameter Design Criterion for Inverter-Based Distributed Generation , 2016, IEEE Transactions on Power Delivery.

[26]  Amin Hajizadeh,et al.  Nonlinear fractional‐order power system stabilizer for multi‐machine power systems based on sliding mode technique , 2015 .

[27]  M. J. Hossain,et al.  Robust Control for Power Sharing in Microgrids With Low-Inertia Wind and PV Generators , 2015, IEEE Transactions on Sustainable Energy.

[28]  Gevork B. Gharehpetian,et al.  Power Calculation Using RBF Neural Networks to Improve Power Sharing of Hierarchical Control Scheme in Multi-DER Microgrids , 2016, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[29]  Heidar Ali Talebi,et al.  A Decentralized Robust Mixed $H_{{2}}/ H_{{{\infty }}}$ Voltage Control Scheme to Improve Small/Large-Signal Stability and FRT Capability of Islanded Multi-DER Microgrid Considering Load Disturbances , 2018, IEEE Systems Journal.

[30]  Heidar Ali Talebi,et al.  A new current limiting strategy and fault model to improve fault ride-through capability of inverter interfaced DERs in autonomous microgrids , 2017 .

[31]  Yaoyao Wang,et al.  Practical Tracking Control of Robot Manipulators With Continuous Fractional-Order Nonsingular Terminal Sliding Mode , 2016, IEEE Transactions on Industrial Electronics.

[32]  Heidar Ali Talebi,et al.  Nonlinear Load Sharing and Voltage Compensation of Microgrids Based on Harmonic Power-Flow Calculations Using Radial Basis Function Neural Networks , 2018, IEEE Systems Journal.

[33]  Heidar Ali Talebi,et al.  Eigenvalue, Robustness and Time Delay Analysis of Hierarchical Control Scheme in Multi-DER Microgrid to Enhance Small/Large-Signal Stability Using Complementary Loop and Fuzzy Logic Controller , 2017, J. Circuits Syst. Comput..

[34]  Heidar Ali Talebi,et al.  Three-phase AC/DC power-flow for balanced/unbalanced microgrids including wind/solar, droop-controlled and electronically-coupled distributed energy resources using radial basis function neural networks , 2017 .

[35]  Heidar Ali Talebi,et al.  Fuzzy unscented transform for uncertainty quantification of correlated wind/PV microgrids: possibilistic–probabilistic power flow based on RBFNNs , 2017 .

[36]  Gevork B. Gharehpetian,et al.  Real-time verification of new controller to improve small/large-signal stability and fault ride-through capability of multi-DER microgrids , 2016 .

[37]  G.B. Gharehpetian,et al.  Effect of type and interconnection of DG units in the fault current level of distribution networks , 2008, 2008 13th International Power Electronics and Motion Control Conference.

[38]  Heidar Ali Talebi,et al.  Reliability/cost-based multi-objective Pareto optimal design of stand-alone wind/PV/FC generation microgrid system , 2016 .

[39]  E.F. El-Saadany,et al.  Robust High Bandwidth Discrete-Time Predictive Current Control with Predictive Internal Model—A Unified Approach for Voltage-Source PWM Converters , 2008, IEEE Transactions on Power Electronics.

[40]  Heidar Ali Talebi,et al.  Application of RBF neural networks and unscented transformation in probabilistic power-flow of microgrids including correlated wind/PV units and plug-in hybrid electric vehicles , 2017, Simul. Model. Pract. Theory.

[41]  Gevork B. Gharehpetian,et al.  Multi-objective optimal power management and sizing of a reliable wind/PV microgrid with hydrogen energy storage using MOPSO , 2017, J. Intell. Fuzzy Syst..

[42]  Hamid Reza Baghaee,et al.  Security/cost-based optimal allocation of multi-type FACTS devices using multi-objective particle swarm optimization , 2012, Simul..