Decentralized Bidirectional Voltage Supporting Control for Multi-Mode Hybrid AC/DC Microgrid

Abstract

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Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

“…In this context, real-time simulations and hardware-in-the-loop technologies are beneficial mainly because of their easily reconfigurable test environment and the possibility to determine exact values of control parameters and debug them [243], [244]. Some recent papers validate their methodologies in the control and optimization of hybrid AC/DC MGs through real-time simulation approaches [99], [245], [246], [247]. The study in [248] presented a comprehensive testbed for real-time multiagent systems for decentralized and distributed MG control.…”

Adjustable inertia implemented by bidirectional power converter in hybrid AC/DC microgrid

“…The energy storage (ES) connects to the DC subgrid through a bidirectional DC/DC converter and regulates the DC bus voltage. A classical modified DC droop control is applied to the ES [4]. The P-V 2 droop control can be expressed as…”

“…And droop control is a classical strategy for AC/DC converters, which have advantages in coordinating multiple units in an autonomous way without communication links. Therefore, several novel droop-control-based methods present significant effect on steady-state problems in hybrid AC/DC microgrid, for instance voltage support [4], accurate current sharing [5], circulating currents suppression [6], subgrids interaction [7], storage SOC equalisation [8], generation-storage coordination [9], etc. Nevertheless, the transient processes of the hybrid AC/DC microgrid tend to be neglected while adopting these abovementioned modified droop-control-based methods, which will affect the stable operation of the system.…”

A Bus-Sectionalized Hybrid AC/DC Microgrid: Concept, Control Paradigm, and Implementation

“…However, the utilization of the proportion integration (PI) controller in the voltage regulation loop restricts the extension of the method in the parallel operation scenario. Yang et al proposed a decentralized bidirectional voltage supporting control strategy for interlinking converters [14]. An AC phase angle versus DC voltage inverse droop control with virtual impedance is designed to support both AC and DC voltages.…”