An electrical power system connected to a power grid, comprising: a system-level controller; a plurality of clusters of electrical power subsystems, each of the electrical power subsystems comprising a bi-directional power converter electrically coupled to a generator having a generator rotor and a generator stator, each of the electrical power subsystems defining a stator power path and a converter power path for providing power to the power grid, the converter power path comprising a partial power transformer, the bi-directional power converter comprising a rotor-side converter joined to a line-side converter via a regulated DC link 128, the rotor-side converter being configured to convert AC power provided from the generator rotor into DC power and provide the DC power to the DC link, the line side converter being configured to convert the DC power on the DC link into AC output power suitable for the power grid, the partial power transformer corresponding to a two-winding transformer comprising a primary winding connected to the power grid and a secondary winding connected to the rotor side converter; a cluster transformer (145, 146, 147) connecting each cluster of electrical power subsystems to the power grid; and, a plurality of cluster-level controllers communicatively coupled with the system-level controller, each of the clusters of electrical power subsystems communicatively coupled with one of the cluster-level controllers, each of the cluster-level controllers configured to perform one or more operations, the one or more operations comprising: receiving, from the system-level controller, a reactive power command; generating, via each of the cluster-level controllers, a cluster-level reactive current command for each cluster of electrical power subsystems based on the reactive power command; and, distributing, via each of the cluster-level controllers, a subsystem-level reactive current command to subsystem-level controllers of the electrical power subsystems based on the cluster-level reactive current command. a system-level controller; a plurality of clusters of electrical power subsystems, each of the electrical power subsystems comprising a bi-directional power converter electrically coupled to a generator having a generator rotor and a generator stator, each of the electrical power subsystems defining a stator power path and a converter power path for providing power to the power grid, the converter power path comprising a partial power transformer, the bi-directional power converter comprising a rotor-side converter joined to a line-side converter via a regulated DC link 128, the rotor-side converter being configured to convert AC power provided from the generator rotor into DC power and provide the DC power to the DC link, the line side converter being configured to convert the DC power on the DC link into AC output power suitable for the power grid, the partial power transformer corresponding to a two-winding transformer comprising a primary winding connected to the power grid and a secondary winding connected to the rotor side converter; a cluster transformer (145, 146, 147) connecting each cluster of electrical power subsystems to the power grid; and, a plurality of cluster-level controllers communicatively coupled with the system-level controller, each of the clusters of electrical power subsystems communicatively coupled with one of the cluster-level controllers, each of the cluster-level controllers configured to perform one or more operations, the one or more operations comprising: receiving, from the system-level controller, a reactive power command; generating, via each of the cluster-level controllers, a cluster-level reactive current command for each cluster of electrical power subsystems based on the reactive power command; and, distributing, via each of the cluster-level controllers, a subsystem-level reactive current command to subsystem-level controllers of the electrical power subsystems based on the cluster-level reactive current command. receiving, from the system-level controller, a reactive power command; generating, via each of the cluster-level controllers, a cluster-level reactive current command for each cluster of electrical power subsystems based on the reactive power command; and, distributing, via each of the cluster-level controllers, a subsystem-level reactive current command to subsystem-level controllers of the electrical power subsystems based on the cluster-level reactive current command.