Multi-Port Grid Forming Control for Grid Interties

A grid forming vector current control system for controlling a grid intertie, the system comprising:

• a first terminal configured to be connected to a first power grid, the first terminal comprising a first current control unit, a first virtual admittance unit, and a first phase locked loop (PLL) unit, wherein the first virtual admittance unit and the first PLL unit are configured to emulate an inertia of a first virtual synchronous machine (VSM) and a first virtual current source is connected in parallel to the first VSM;
• a second terminal configured to be connected to a second power grid, the second terminal comprising a second current control unit, a second virtual admittance unit, and a second PLL unit, wherein the second virtual admittance unit and the second PLL unit are configured to emulate an inertia of a second, VSM and a second virtual current source is connected in parallel to the second VSM;
• and
• a controller configured to use transient power consumed by the first VSM to generate a power-equivalent current reference to control the second virtual current source and to use transient power consumed by the second VSM to generate a power-equivalent current reference to control the first virtual current source.