DC Link Capacitor Ripple Constraints Limit the Benefits of Utility-Owned Four-Wire Power Converters (opens in new tab)

Utilities are increasingly interested in power converters to increase the headroom of their assets by actively controlling power flows on their network. In this work we demonstrate that thermal limits of dc link capacitors can result in substantially diminished benefits of these converters under unbalanced operation, due to constraints on neutral current and double-line frequency power ripple. Considering nine voltage source converter topologies...