Power Sharing Control of Islanded AC Microgrid Considering Droop Control and Virtual Impedance

Microgrids appear as the key part of the future power systems that include distributed generators, renewable energy, and energy storage. In this paper a decentralized power sharing control scheme that includes droop control with virtual impedances with PI controllers for the voltage and current is proposed for an islanded AC microgrid with two voltage source inverters in parallel that share a residential load. To avoid circulating currents and unbalanced power sharing due to line impedance differences in the microgrid, virtual impedances are added. The proposed control scheme is implemented in MAT-LAB/Simulink to prove the proper operation under inductive behavior and mismatches in the line impedances of the microgrid system.

[1]  Yan Xiangwu,et al.  Control Strategy for Parallel Inverters Based on Virtual Impedance in AC Microgrid , 2018, 2018 2nd IEEE Conference on Energy Internet and Energy System Integration (EI2).

[2]  Wei TIAN,et al.  Droop control method for load share and voltage regulation in high-voltage microgrids , 2016 .

[3]  Mingrui Zhang,et al.  Circulating Current Control Strategy Based on Equivalent Feeder for Parallel Inverters in Islanded Microgrid , 2019, IEEE Transactions on Power Systems.

[4]  Wenhua Wu,et al.  Harmonic Voltage Distortion Damping Method for Parallel-Connected LCL-Type Inverters in Islanded Operation , 2019, IEEE Transactions on Industrial Electronics.

[5]  R. E. Betz,et al.  Arctan Power–Frequency Droop for Improved Microgrid Stability , 2013, IEEE Transactions on Power Electronics.

[6]  Josep M. Guerrero,et al.  Control of Distributed Uninterruptible Power Supply Systems , 2008, IEEE Transactions on Industrial Electronics.

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

[8]  Juan C. Vasquez,et al.  Reactive Power Sharing and Voltage Harmonic Distortion Compensation of Droop Controlled Single Phase Islanded Microgrids , 2014, IEEE Transactions on Smart Grid.

[9]  Anders Bergheim Holvik.  Virtual Impedance Techniques for Power Sharing Control in AC Islanded Microgrids , 2018 .

[10]  Bill Rose,et al.  Microgrids , 2018, Smart Grids.

[11]  Tansu Alpcan,et al.  Power Sharing in Angle Droop Controlled Microgrids , 2017, IEEE Transactions on Power Systems.

[12]  Rong-Jong Wai,et al.  A Novel Voltage Stabilization and Power Sharing Control Method Based on Virtual Complex Impedance for an Off-Grid Microgrid , 2019, IEEE Transactions on Power Electronics.

[13]  Josep M. Guerrero,et al.  Output impedance design of parallel-connected UPS inverters with wireless load-sharing control , 2005, IEEE Transactions on Industrial Electronics.

[14]  Usman Bashir Tayab,et al.  A review of droop control techniques for microgrid , 2017 .

[15]  Fredrik Göthner,et al.  Effect of Including Transient Virtual Impedance in Droop-Controlled Microgrids , 2018, 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe).

[16]  Ehab F. El-Saadany,et al.  A Novel Decentralized Control Scheme for Enhanced Nonlinear Load Sharing and Power Quality in Islanded Microgrids , 2019, IEEE Transactions on Smart Grid.

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

[18]  Chen Shen,et al.  A Distributed, Cooperative Frequency and Voltage Control for Microgrids , 2018, IEEE Transactions on Smart Grid.

[19]  Jun Wang,et al.  Droop Control Strategy Incorporating Coupling Compensation and Virtual Impedance for Microgrid Application , 2019, IEEE Transactions on Energy Conversion.