Objective 1:
Reviewed grid codes and standards for multiport power converters (MPCs) at low and medium voltages, identifying where MPCs deliver value in distribution networks using quantitative KPI metrics. Assessed the strengths and weaknesses of existing MPC topologies, aligned with relevant KPIs. Facilitated partner discussions on the design of low and medium voltage MPCs, using insights from code and topology reviews to define essential port requirements. Developed case studies and compiled data while also reviewing control and communication technologies applicable to MPCs.
Objective 2:
Developed simulation models for isolated, non-isolated, and hybrid multiport converters with two AC ports and one DC port. Designed and experimentally validated modulation and control strategies for various operation scenarios. Explored active bridge DC–DC converters for isolation stages and compared outer-loop control strategies in modular multilevel converters. Implemented grid-forming controls for improved resilience in weak and islanded networks, and compared topologies for soft open point applications. Developed and validated zero-voltage switching optimization and voltage selection for DC–DC converters, with experimental testing using hardware and CHIL methods.
Objective 3:
Created MPC fault ride-through control strategies, with stability analyses for dc-dc and ac-dc converters validated by HIL simulations and prototypes. Proposed symmetric and asymmetric multiport Y-converters for AC/DC linkage, incorporating nonlinear and discontinuous modulation to improve integration, mitigate distortion, and enhance performance under renewable profiles—all confirmed through extensive experimental work.
Objective 4:
Devised approaches for optimal MPC sizing and placement, using machine learning for representative day selection. Assessed local and global sizing, applied to buildings and network case studies, introduced GIS-based resilience metrics, and developed investment guidance for fault recovery supported by MPCs.
Objective 5:
Modeled real distribution grids, analyzing flows and SOP converters under varied controls and faults. Optimized MPC operation, performed sensitivity and impact analyses, and validated control techniques using control and power hardware-in-the-loop experiments.
Objective 6:
Conducted techno-economic and life cycle analyses—including carbon footprint assessment—comparing MPCs and single converters. Quantified KPIs for carbon, energy, and materials, and outlined business models for various MPC applications.
