A wild horse-assisted decentralized control strategy for a PV-battery energy storage system in a DC microgrid

Microgrids have become inevitable choice for society to avoid carbon footprints and to reduce global warming. For the efficient operation of DC Microgrid, it is very important to maintain the stability of the DC bus voltage across the grid. Thus, owing to the dynamic behaviour of renewable energy sources, it is difficult to maintain the DC Microgrid voltage constant. To overcome the above problem, a robust decentralized droop control technique is required to generate the proper droop gains across each converter to share the load equally to maintain the stability of the DC bus voltage. In this paper, a novel methodology is proposed known as Improved Wild Horse Optimization (WHO), which is used to estimate the droop gains such as \(\Delta {R}_{d1} \ \text{and} \ \Delta {R}_{d2},\) $\mathrm{\Delta }{R}_{d1}\text{and}\mathrm{\Delta }{R}_{d2},$ which assists in the enhancement of the stability of DC Microgrid. The proposed control strategy shows higher performance in comparison to other standard controllers. In contrast to the conventional droop gains of 0.2 and 0.2, the new droop gains \(\Delta {R}_{d1}\ \text{and} \ \Delta {R}_{d2}\) $\mathrm{\Delta }{R}_{d1}\text{and}\mathrm{\Delta }{R}_{d2}$ have given better values of 0.15 and 0.1.