On Design of DC-Link Voltage Controller and PQ Controller for Grid Connected VSC for Microgrid Application

The paper presents design of two controllers for grid-connected Voltage Source Converter (VSC) of Microgrid. The control objective is to provide power sharing from renewable sources of Microgrid to main grid. The PV, BESS and wind system need VSC for grid connection. Both DC-link voltage control and Active/Reactive power (PQ) control provide reference currents for inner current controller to generate modulating signal for PWM technique to generate pulses for VSC. DC-link voltage control regulates dc-link voltages to control power whereas active/reactive power control provides direct control of power injection into grid. The controls are designed in synchronous reference frame. Simulation results are provided in order to show the performance of the controllers.

[1]  M. A. Abido,et al.  Optimal Design of Microgrids in Autonomous and Grid-Connected Modes Using Particle Swarm Optimization , 2011, IEEE Transactions on Power Electronics.

[2]  Gooi Hoay Beng,et al.  Single-phase grid-tied photovoltaic inverter to control active and reactive power with battery energy storage device , 2016, 2016 IEEE Region 10 Conference (TENCON).

[3]  A. Arulampalam,et al.  Voltage Source Converters to Improve the Operation of the Micro-grid , 2008, 2008 IEEE Region 10 and the Third international Conference on Industrial and Information Systems.

[4]  Awais Kami,et al.  Energy balance based DC-link voltage control of grid tied battery connected multistage bidirectional PV inverter system , 2017, 2017 2nd International Conference on Power and Renewable Energy (ICPRE).

[5]  Sukumar Mishra,et al.  Real and reactive power control of solar grid-tie inverter under distorted grid conditions , 2018, 2018 International Conference on Power, Instrumentation, Control and Computing (PICC).

[6]  Mohamed Azab,et al.  Flexible PQ control for single-phase grid-tied photovoltaic inverter , 2017, 2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe).

[7]  Jih-Sheng Lai,et al.  An easy, simple, and flexible control scheme for a three-phase grid-tie inverter system , 2010, 2010 IEEE Energy Conversion Congress and Exposition.