DC-Link Voltage Control and Power Management of BESS Integrated Wind Power System Using PSCAD

Abstract

The rapid growth of wind energy presents both opportunities and challenges for power systems. Sudden changes in wind speed can lead to fluctuations in power generation, making it challenging to match the supply with the demand in real-time. Due to fluctuating wind characteristics, incorporating power from the wind turbines in the electrical grid has an effect on the power quality. The long-term unpredictability of renewable energy source, like wind, makes a certain amount of energy storage necessary. Previous wind power systems are operating without storage techniques because of some technical concerns like grid has to be expanded, modernized, and one has to take measures to control or stabilize the grid during off peak and on peak load conditions. This has been done by implementing multi-source converter control topology. A multisource converter based battery storage system as a secondary power source is a good approach for making wind turbines dispatchable because of the fact that battery storage act as a constant voltage source by offering a quick response in either charging or discharging. In this research, a simulation model is developed in which a battery energy storage system integrated at the DC-link of a Type-4 wind turbine. A control system is designed to control the power output to the grid depending upon the grid power requirements and wind power production by charging or discharging the battery storage system while also keeping a stable DC-link voltage. The simulation results illustrate the control of DC-link integrated battery energy storage system at different set point wind speeds and set point grid power as well as with time-series wind data. At the end SOC permit control approach has also been illustrated. All of these have been analyzed in PSCAD/EMTDC simulation software.