A system for connecting a wind turbine generator to a utility power network includes a first power converter that converts an AC signal from the wind turbine generator to a DC signal and supplies a controlled amount of reactive current to the wind turbine generator. The system also includes a second power convert...

In a general aspect, a power conversion system includes a power converter, a transformer, and a voltage adjustment device. The power converter is configured to receive a variable DC power generated by a power generation device and to convert the received DC power to AC power at a first voltage. The transformer is co...

A cryogenic cooling system (100) for cooling a thermal load disposed in a rotating reference frame (10). The cryogenic cooling system includes a cryocooler (11) disposed in the rotating reference frame, the cryocooler including a cold head (12) for cooling the thermal load (17), and a circulator (13) disposed in ...

In one aspect, in general, the invention features a control system configured for use with a three-phase PWM converter. The control system receives an input signal from a three-phase power supply and provides an output signal at a DC link. A voltage-separating module generates on the basis of the input signal a p...

A laminated superconductor wire includes a superconductor wire assembly, which includes a first superconductor insert comprising a first high temperature superconductor layer overlaying a first substrate and a second superconductor insert comprising a second high temperature superconductor layer overlaying a secon...

A superconducting wire includes first and second superconducting layers disposed on one or more substrates in stacked relationship, the first superconducting layer comprising a high temperature superconducting oxide of a first composition and the second superconducting layer comprising a high temperature superco...

A rotor assembly includes a superconducting winding assembly positioned within a cryogenic region of the rotor assembly. The rotor assembly includes a torque transfer assembly that includes first and second tubes that are positioned in a radial space external to the superconducting winding assembly and that extend a...

A component cooling system includes a component tank configured to receive a heat-generating device. The component tank is at least partially filled with a sub cooled liquid at a first pressure and at a first temperature. A cryogenic system maintains the component tank at essentially the first temperature. The cryog...

A stator assembly (100) for use in a superconducting generator (10) operated at frequencies up to 10 Hz is disclosed. The stator assembly includes a ferromagnetic stator winding support (102) having a plurality of teeth (112) defining slots (114), the slots configured to receive and support stator windings (130). Th...

An apparatus for harvesting solar power includes a photovoltaic array for generating a DC voltage; a discharge circuit for causing the DC voltage to decay from a first value to a second value; and an inverter circuit for transforming an output voltage from the discharge circuit into an AC voltage. ...

A superconducting electrical cable system is configured to be included within a utility power grid having a known fault current level. The superconducting electrical cable system includes a non- superconducting electrical path interconnected between a first node and a second node of the utility power grid. A superco...

A cryogenically-cooled HTS wire includes a stabilizer having a total thickness in a range of 200-600 micrometers and a resistivity in a range of 0.8-15.0 microOhm cm at approximately 90 K. A first HTS layer is thermally-coupled to at least a portion of the stabilizer.

A cryogenically-cooled HTS cable is configured to be included within a utility power grid having a maximum fault current that would occur in the absence of the cryogenically- cooled HTS cable. The cryogenically-cooled HTS cable includes a continuous liquid cryogen coolant path for circulating a liquid cryogen. A con...

A cooling system includes a first section of high temperature superconducting (HTS) cable configured to receive a first flow of coolant and to permit the first flow of coolant to flow therethrough. The system may further include a second section of high temperature superconducting (HTS) cable configured to receive a...

A static synchronous compensator configured to be installed in and provide reactive power to a medium voltage electric distribution system. There is a multi-level cascaded H-bridge (CHB) converter in an enclosure having a nominal operating voltage in the medium voltage range. There is a first electrical bushing conn...

A high temperature superconductor (HTS) rotating machine having a longitudinal axis and having a first rotational inertia. There is a cylindrical stator assembly disposed about the longitudinal axis and a cylindrical rotor assembly disposed within the stator assembly. The rotor assembly is configured to rotate withi...

A hybrid electrical and mechanical ship propulsion and electric power system, includes a first mechanical power plant (58, 60) configured to drive a first propeller (61) via a first shaft (59). There is a second electrical power plant (22, 24, 26) configured to drive a second propeller (57) via a second shaft (55). ...

A yaw auto-calibration method configured to calibrate an anemometer of a yaw control system to correct for yaw misalignment, includes collecting wind speed and wind direction data from the anemometer over a plurality of time periods. The method includes determining from the collected data a wind direction compensati...

A yaw auto-calibration method configured to calibrate at least one anemometer of a yaw control system to correct for yaw misalignment. The yaw auto-calibration method includes collecting wind turbine data over a plurality of time periods with respect to the at least one anemometer. The wind turbine data including on...

An electrical power system for a watercraft including a first electrical power plant configured to operate in a variable frequency mode to output variable frequency power to a first electrical network and a fixed frequency mode to output fixed frequency power to a second electrical network. There is a first electric...