Dear Colleagues, 

The increasing DC-based distributed generators (DGs) and DC loads, along with the available AC networks, are promoting the development of hybrid AC/DC distribution systems in future networks. In the hybrid AC/DC distribution systems, there are potential power and voltage conversions among medium-voltage AC (MVAC), medium-voltage DC (MVDC), low-voltage DC (LVDC), and low-voltage AC (LVAC) systems. The available solutions include power electronic transformer (PET), DC transformer, and flexible AC–AC transformer, which are power-electronics-based transformers, adopting advanced topologies and control methods to adapt the power conversion among different voltage types/levels. These power conversion equipment have good application prospects in hybrid AC/DC distribution systems. 

To exploit the capabilities of power conversion equipment, together with the demands of low cost, low size, high efficiency, and high reliability, considerable research efforts are being made on the topology, model, control, parameter design, stability, and fault handling. In addition, with the interaction between power conversion equipment and distribution systems, the issue of system stability is becoming a significant concern. The effective system stability assessment methods and enhancing strategies are actively researched to ensure the safe operation of hybrid AC/DC distribution systems. The stochastic risk caused by the intermittent nature of DGs is also a significant concern. Thus, intelligent energy management techniques are emerging to realize the flexible connection and coordinated operation among different DGs and loads, as well as to ensure the optimal operation of AC/DC distribution systems. This Special Issue entitled “Power Conversion Equipment and Control in Hybrid AC/DC Distribution Systems” focuses on the issues of compact and efficient power conversion equipment and advanced control strategy for hybrid AC/DC distribution systems. Prospective authors are invited to submit original contributions or survey papers for review and publication in this Special Issue. Topics of interest include, but are not limited to, the following: 

• Topology, model, control, parameter design, stability, and fault handling of power conversion equipment, including PET, DC transformer, flexible AC–AC transformer, etc.;
• Small-signal stability assessment of hybrid AC/DC distribution systems;
• Damping enhancing and stability improvement solutions of hybrid AC/DC distribution systems;
• Energy management and coordinated operation strategies of hybrid AC/DC distribution systems;
• Fault detection, analysis, and ride-through method of hybrid AC/DC distribution systems.

Prof. Dr. Wu Chen
Guest Editor

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• integration of DC-based DGs and DC loads
• hybrid AC/DC distribution systems
• power electronic
• transformer
• DC transformer
• flexible AC–AC transformer
• advanced topology and control
• small-signal stability assessment
• damping enhancing and stability improvement
• energy management and coordinated operation
• fault detection, analysis, and ride-through