Abstract
Communication-based distributed secondary control is extensively used in DC microgrids. Compared to centralized control, it can provide better voltage regulation and load sharing in microgrids. A conventional secondary control technique that converges the system to a common operating point is improved by using the control methodology to detect the communication link failure and stabilize the system operation during communication islanding. Recently, more robust control schemes have been proposed to improve resilience, but communication islanding has not been addressed at the secondary level control for which the system requires additional tertiary control. However, link failure is a possibility in the microgrid, so this paper proposes a control scheme at the secondary level to detect communication islanding. Communication islanding may lead the system to unpredictable behavior, which may cause the system to become unstable and may further lead to a cascading failure. The proposed control scheme sustains the stability and operation of a DC microgrid. Voltage and current observer works in a parallel manner with the proposed secondary control to achieve a correction term for global operating points. The proposed control scheme has been verified through analysis and simulation.
Highlights
Microgrids are small-scale isolated distribution systems which are currently receiving increased attention due to the widespread use of renewable energy resources, energy storage batteries, and the increment of electronics-based loads that use DC current
This paper focuses on the improvement of the secondary-level control of DC microgrids
DC microgrid Figure (MG) systems based on multiple DC–DC converters usually have high switching frequency
Summary
Microgrids are small-scale isolated distribution systems which are currently receiving increased attention due to the widespread use of renewable energy resources, energy storage batteries, and the increment of electronics-based loads that use DC current. It is desired to extend the distributed control in secondary and primary control levels; this control provides voltage regulation and better load sharing for DC microgrids [15]. Improvement in systems requires a secondary control system that has better voltage regulation and load sharing, which is done over a communication network. Voltage regulation at a fixed point and current in per-unit are used in consensus to share the current between nodes This involves tertiary, secondary, and primary controls. The efficiency of DC microgrids varies because of the effect of communication delays generated between the nodes to exchange values This can cause system instability and response to load sharing of nodes [24,25,26].
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