Decentralized Bus Voltage Restoration for DC Microgrids
Voltage drops are caused by resistances of feeders connecting converters to the common DC bus, resulting in a reduced DC bus voltage compared to the nominal/desired value.
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It is imperative to properly control the DC bus voltage and manage power among the sources and loads in order to maintain the stability and reliability of DC microgrids. DC microgrids can be controlled by employing centralized, decentralized, distributed, multi-level, and hierarchical control systems to ensure safe and secure operation.
This article critically reviews two main aspects of DC microgrids: voltage control and power management. The challenges and opportunities for voltage control and power management in DC microgrids are discussed.
The inertia of the system can be increased by reducing the degree of bus voltage oscillations and solving the problem of large voltage deviations. Current methods for improving the stability of DC microgrids are positive and passive damping strategies.
As a result, DC bus voltage suffers from rapid changes, oscillations, large excursions during load disturbances, and fluctuations in renewable energy output. These issues can greatly affect voltage-sensitive loads. This study proposes an integrated control method for the bus voltage of the DC microgrid to solve the abovementioned problems.
Voltage drops are caused by resistances of feeders connecting converters to the common DC bus, resulting in a reduced DC bus voltage compared to the nominal/desired value.
Within the limitations of battery lifetime, a complete control and power management strategy for PV and battery-based microgrids for grid-connected and islanded modes was presented
The solar power generation includes certain randomness and volatility, coupled with dynamic load involved in power fluctuations, which renders microgrid having certain unplanned
However, ramping voltage of a dead microgrid bus with connected loads that have not been isolated is not optimal for many reasons, including chattering of control contactors, sensitive electronics, and more.
Conventional droop control is mainly used for DC microgrids. As a result, DC bus voltage suffers from rapid changes, oscillations, large excursions during load disturbances, and fluctuations
Under the integrated control strategy, the DC bus voltage change rate slows down significantly, the oscillation ampli-tude is reduced to about 2 V, and the bus voltage recovers to 800.5 V after the
It can achieve high-precision control of bus voltage and load distribution when the state is limited. The simulation results verify that this control strategy can reduce voltage drop and achieve
It is imperative to properly control the DC bus voltage and manage power among the sources and loads in order to maintain the stability and reliability of DC microgrids.
For this reason, this paper proposes a battery charger/discharger based on the Sepic/Zeta converter and an adaptive controller, which provides bidirectional current flow, stable bus voltage,
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