In a self-sufficient energy system, voltage control is an important key to dealing with upcoming challenges of renewable energy integration into DC microgrids, and thus energy storage systems (ESSs) are often employed to
With the rapid increase of renewable energy integration, more serious power fluctuations are introduced in distribution systems. To mitigate power fluctuations caused by renewables, a microgrid with energy storage
When the power of the microgrid system changes, the voltage on the DC bus will fall or rise in order to maintain the power balance of the microgrid. When the DC bus voltage fluctuates, the energy storage system will be put into operation, absorbing or releasing power to make the bus voltage tends stable.
In the DC microgrid, because there is no reactive power flow, the voltage becomes the only indicator of the power balance of the system. When the power of the microgrid system changes, the voltage on the DC bus will fall or rise in order to maintain the power balance of the microgrid.
The simulation model of a DC microgrid system with composite energy storage is built on a simulation platform. The proposed control strategy can help to improve the voltage stability under the circumstances of light intensity fluctuation and power generation unit failure. 2.
It can be seen from Figure 17 that when the output power of other units in the DC microgrid is insufficient to support the bus voltage, the battery energy storage unit responds quickly and increases the output power to maintain the bus voltage stability.
Recent control and optimization techniques like model predictive control, distributed control algorithms, and advanced optimization algorithms can improve DC microgrids’ performance and efficiency by enabling dynamic control of power flow, voltage regulation, and energy management.
A DC microgrid voltage stabilization control strategy is designed based on droop control and improved PI control, which effectively improves the stability of DC microgrid operation. The simulation model of a DC microgrid system with composite energy storage is built on a simulation platform.
