Voltage Grid Supporting by Using Variable Structure Adaptive Virtual Impedance for LCL-Voltage Source Converter DG Converters

This article proposes a voltage grid supporting applied for DGs based on LCL-VSC to control the delivered power flow and improve the point of common coupling (PCC) voltage regulation. A variable structure adaptive virtual impedance (VS-AVI) imposes the required DG impedance for achieving the system voltage requirements, considering the power rating of the DG converter. Differently of the solutions presented in the literature, the proposed VS-AVI employs adaptive piecewise linear droop function and dead zone for emulating the virtual capacitance for shaping the equivalent grid impedance and achieves the required PCC voltage regulation. Simulation and experimental results validate the proposed VS-AVI and demonstrate its effectiveness.

[1]  Pedro Rodriguez,et al.  Inertia Emulation in AC/DC Interconnected Power Systems Using Derivative Technique Considering Frequency Measurement Effects , 2017, IEEE Transactions on Power Systems.

[2]  Jin Jiang,et al.  Accurate Reactive Power Sharing in an Islanded Microgrid Using Adaptive Virtual Impedances , 2015, IEEE Transactions on Power Electronics.

[3]  Jianguo Zhou,et al.  Distributed Adaptive Virtual Impedance Control for Accurate Reactive Power Sharing Based on Consensus Control in Microgrids , 2017, IEEE Transactions on Smart Grid.

[4]  M Castilla,et al.  Virtual Impedance Loop for Droop-Controlled Single-Phase Parallel Inverters Using a Second-Order General-Integrator Scheme , 2010, IEEE Transactions on Power Electronics.

[5]  Moin Hanif,et al.  Generalized LCL-Filter Design Algorithm for Grid-Connected Voltage-Source Inverter , 2017, IEEE Transactions on Industrial Electronics.

[6]  Oriol Gomis-Bellmunt,et al.  Trends in Microgrid Control , 2014, IEEE Transactions on Smart Grid.

[7]  Josep M. Guerrero,et al.  Mode Adaptive Droop Control With Virtual Output Impedances for an Inverter-Based Flexible AC Microgrid , 2011, IEEE Transactions on Power Electronics.

[8]  Alireza Karimi,et al.  A Robust Active Damping Control Strategy for an $LCL$ -Based Grid-Connected DG Unit , 2017, IEEE Transactions on Industrial Electronics.

[9]  Tapan Kumar Saha,et al.  Voltage Management for Large Scale PV Integration into Weak Distribution Systems , 2018, IEEE Transactions on Smart Grid.

[10]  Yunwei Li,et al.  A Coupled Virtual Impedance for Parallel AC/DC Converter Based Power Electronics System , 2019, IEEE Transactions on Smart Grid.

[11]  Josep M. Guerrero,et al.  Wireless-control strategy for parallel operation of distributed generation inverters , 2006, Proceedings of the IEEE International Symposium on Industrial Electronics, 2005. ISIE 2005..

[12]  F. Blaabjerg,et al.  Control of Power Converters in AC Microgrids , 2012, IEEE Transactions on Power Electronics.

[13]  Ernane Antonio Alves Coelho,et al.  Review of Active and Reactive Power Sharing Strategies in Hierarchical Controlled Microgrids , 2017, IEEE Transactions on Power Electronics.

[14]  Marco Liserre,et al.  LCL-Filter Design for Robust Active Damping in Grid-Connected Converters , 2014, IEEE Transactions on Industrial Informatics.

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

[16]  Chengshan Wang,et al.  A Simple Decentralized Islanding Microgrid Power Sharing Method Without Using Droop Control , 2018, IEEE Transactions on Smart Grid.

[17]  Hao Chen,et al.  Inverter-Less Hybrid Voltage/Var Control for Distribution Circuits With Photovoltaic Generators , 2014, IEEE Transactions on Smart Grid.

[18]  Hong-Hee Lee,et al.  An Adaptive Virtual Impedance Control Scheme to Eliminate the Reactive-Power-Sharing Errors in an Islanding Meshed Microgrid , 2018, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[19]  Dionysios Aliprantis,et al.  Distributed Volt/VAr Control by PV Inverters , 2013, IEEE Transactions on Power Systems.

[20]  Weidong Xiao,et al.  Two Degrees of Freedom Active Damping Technique for $LCL$ Filter-Based Grid Connected PV Systems , 2014, IEEE Transactions on Industrial Electronics.

[21]  Yun Wei Li,et al.  Analysis, Design, and Implementation of Virtual Impedance for Power Electronics Interfaced Distributed Generation , 2011, IEEE Transactions on Industry Applications.

[22]  Xin Ai,et al.  Voltage and frequency control strategies of hybrid AC/DC microgrid: a review , 2017 .

[23]  Xiangning He,et al.  Analysis and Mitigation of Inverter Output Impedance Impacts for Distributed Energy Resource Interface , 2015, IEEE Transactions on Power Electronics.

[24]  K. M. Muttaqi,et al.  A Multi-Mode Control Strategy for VAr Support by Solar PV Inverters in Distribution Networks , 2015, IEEE Transactions on Power Systems.

[25]  Josep M. Guerrero,et al.  Design and Analysis of the Droop Control Method for Parallel Inverters Considering the Impact of the Complex Impedance on the Power Sharing , 2011, IEEE Transactions on Industrial Electronics.

[26]  Chen Shen,et al.  Feasible Range and Optimal Value of the Virtual Impedance for Droop-Based Control of Microgrids , 2017, IEEE Transactions on Smart Grid.

[27]  Frede Blaabjerg,et al.  Virtual-Impedance-Based Control for Voltage-Source and Current-Source Converters , 2015, IEEE Transactions on Power Electronics.

[28]  Yun Wei Li,et al.  An Accurate Power Control Strategy for Power-Electronics-Interfaced Distributed Generation Units Operating in a Low-Voltage Multibus Microgrid , 2009, IEEE Transactions on Power Electronics.

[29]  Avinash Kumar Sinha,et al.  Control Techniques in AC, DC, and Hybrid AC–DC Microgrid: A Review , 2018, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[30]  Jayashri Ravishankar,et al.  Three-Stage Robust Inverter-Based Voltage/Var Control for Distribution Networks With High-Level PV , 2019, IEEE Transactions on Smart Grid.