Multiagent-Based Dynamic Voltage Support of Power Converters During Fault Ride-Through

Reference point of applicability (RPA) is a predefined point in a distribution network that determines performance requirements for multi- distributed energy resource (DER) circuits compliant to international grid codes. As RPA response is often not directly controlled, it requires an aggregate response of multiple DER, which becomes a challenge in complex meshed network environment. This paper presents a multiagent-based distributed dynamic voltage support (DDVS) method for coordinated aggregate response of multiple DER units to support RPA voltage profile during and after fault-ride though in such networks. DDVS implements a multiagent based leader target tracking scheme with velocity matching and flock centering features to avoid uncoordinated current injections of cooperative DERs. The DDVS is an event-based approach based on the RPA requirements. Two-dimensional voltage support objective is handled: (i) coordinated positive sequence current injection for voltage magnitude boosting and (ii) coordinated negative sequence current injection for unbalance voltage mitigation. The results demonstrate that the proposed DDVS algorithm addresses emerging coordinated DVS requirement of DERs.