GWO-PI Controlled Re-Lift LUO Converter for Standalone Load System

When renewable energy resources started, it opened a new horizon to transmission and distribution of electrical energy. Several distributed energy resources are linked to the utility network or microgrid with the aid of a power electronic interface. However, the power quality is deteriorated by different factors such as varying load demands, changing weather condition and nonlinear loads. Hence, the proposed system aims to achieve improved power quality under balanced and unbalanced conditions with high control capability. To raise the quality of power at Distribution side of utility grid, three-phase four-leg VSI is used. In this proposed system, Photovoltaic system is used to supply power to load. Therefore, a DC-DC Relift Luo converter is used, which efficiently boosts the voltage gain while reducing the effects of parasitic elements over a large duty ratio range. Output of DC-DC converter is stabilized using a Grey Wolf Optimization (GWO) tuned PI controller and the effective grid voltage synchronization is achieved by the technique of feedback line controller. To ascertain the working of the proposed design in terms of its efficiency and dynamic compensation capability, a MATLAB based simulation model along with a laboratory prototype are developed and analyzed.