Abstract
With the global consciousness of climate change, renewable energy systems are prioritized over the conventional energy systems. The deep injection of renewables into the power systems is creating several challenges to the grid due to wide variations in their output power depending on the time of the day, weather etc. Of these challenges, frequency change plays a vital role in maintaining the power quality. This paper presents a novel sliding mode controller with non-linear disturbance observer to effectively mitigate the wide changes in the frequency. A sliding mode surface based on estimated disturbance along with states is designed. A sliding mode control law is proposed to compensate disturbances including variations in renewables, load and parameters under mismatched uncertainties. The proposed observer based controller is tested for three area multi-machine power system in MATLAB/Simulink. The simulated results proved to alleviate the frequency variations effectively compared to the conventional controllers.
Highlights
Renewable energy systems have become the cog in the wheel of power systems due to the outcry on global warming
When these sources are synchronized with thermal power generation stations, there are many issues arising such as increased frequency fluctuations, increased losses and reduced operating efficiency
A control law for compensating the lumped disturbance based upon a novel sliding surface for frequency regulation in power system is proposed in this paper
Summary
Renewable energy systems have become the cog in the wheel of power systems due to the outcry on global warming. Most of the emerging countries are trying to shift towards green energy systems by changing their policies towards carbon negativity. Among those renewables, wind and solar plants are mushrooming due to their availability. The major disadvantage of the wind and solar energy is their stochastic nature as they depend on the weather conditions This poses a serious threat to power system stability. Large scale integration of wind energy may lead to increase in interarea oscillations [2] When these sources are synchronized with thermal power generation stations, there are many issues arising such as increased frequency fluctuations, increased losses and reduced operating efficiency
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
