Voltage Quality and Safety Optimization in High-Reliable DC Microgrids with Droop Control

Special generators with slow ramping rates have garnered increasing attention in high-reliable DC microgrid control. However, the energy management of the high-reliable microgrid faces challenges, particularly the flexible regulation and safety issues due to the slow ramp rates and safety constraints of these special generators. This paper proposes an optimization strategy to enhance the security and reliability of high-reliable DC microgrid operations by minimizing the number of special generator adjustments and increasing the reserve capacity of emergency generators. Furthermore, to address steady-state voltage quality degradation caused by voltage drops in droop control, a model optimizing the reference voltage of droop control is developed, which effectively alleviates voltage deviations. The proposed optimization model is tested through three various load scenarios. Results show that the number of special generator output adjustments is reduced by over 20.00 %, while the reserve capacity for emergency generators increases by more than <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{3 5. 3 3 \%}$</tex>. Additionally, our model enhances voltage quality effectively.