A power generating system architecture includes a prime mover, a generator component including a switched reluctance generator, the switched reluctance generator being mechanically coupled to the prime mover and having a plurality of stator pole windings, a DC power bus connected to at least one output of the switched reluctance generator, the DC power bus including a positive bus bar and a negative bus bar, at plurality of series arranged energy storage devices connecting the positive bus bar and the negative bus bar, a plurality of state of charge modules connected to the plurality of energy storage devices, each of the state of charge modules being communicatively coupled to a generator controller, and the generator controller being configured to independently control each of the stator pole windings.

A power generating system architecture includes a prime mover, a generator component including a switched reluctance generator, the switched reluctance generator being mechanically coupled to the prime mover and having a plurality of stator pole windings, a DC power bus connected to at least one output of the switched reluctance generator, the DC power bus including a positive bus bar and a negative bus bar, at plurality of series arranged energy storage devices connecting the positive bus bar and the negative bus bar, a plurality of state of charge modules connected to the plurality of energy storage devices, each of the state of charge modules being communicatively coupled to a generator controller, and the generator controller being configured to independently control each of the stator pole windings.

A power system architecture includes a prime mover, a plurality of single phase permanent magnet generators mechanically coupled to the prime mover, a DC power bus including a plurality of DC power storage components, each of the DC energy storage components being electrically connected to at least one of the single phase permanent magnet generators, a plurality of state of charge calculators, each of the state of charge calculators being connected to one of the DC energy storage component and being communicatively coupled to a generator control unit, and wherein the generator control unit is configured to independently control each of the single phase permanent magnet generators.

An integrated starter-generator (ISG) system includes a flux-regulated permanent magnet machine (PMM), a wound-field synchronous machine, and a control coil controller. The flux-regulated PMM includes a stationary portion having a control coil and a plurality of permanent magnets, and a rotating portion that includes rotating armature windings. The wound-field synchronous machine includes a stationary portion that includes a main armature winding and a rotating portion that includes a main field winding that receives excitation from the flux-regulated PMM. The control coil controller controls current supplied to the control coil of the flux-regulated PMM to selectively control magnetic flux presented to the rotating armature windings.

An integrated starter-generator (ISG) system includes a flux-regulated permanent magnet machine (PMM), a wound-field synchronous machine, and a control coil controller. The flux-regulated PMM includes a stationary portion having a control coil and a plurality of permanent magnets, and a rotating portion that includes rotating armature windings. The wound-field synchronous machine includes a stationary portion that includes a main armature winding and a rotating portion that includes a main field winding that receives excitation from the flux-regulated PMM. The control coil controller controls current supplied to the control coil of the flux-regulated PMM to selectively control magnetic flux presented to the rotating armature windings.

A rotary electrical machine including an annular stator having a stator core around which an armature winding is wound, and a rotor arranged on an inner circumference of the stator, a permeance of a q-axis magnetic circuit is made larger than a permeance of a d-axis magnetic circuit. The machine includes a switch for supplying power to a field winding and controller. The controller calculates the duty ratio on the condition that an upper limit of the duty ratio of the switch is a predetermined value and turns on/off the switch based on the calculated ratio. The predetermined value is set to a value larger than the duty ratio corresponding to the field current that gives the maximum reduction amount of the inductance of the field winding with respect to an increasing amount of the field current in a range that the current can take and is less than 100%.

A rotary electrical machine including an annular stator having a stator core around which an armature winding is wound, and a rotor arranged on an inner circumference of the stator, a permeance of a q-axis magnetic circuit is made larger than a permeance of a d-axis magnetic circuit. The machine includes a switch for supplying power to a field winding and controller. The controller calculates the duty ratio on the condition that an upper limit of the duty ratio of the switch is a predetermined value and turns on/off the switch based on the calculated ratio. The predetermined value is set to a value larger than the duty ratio corresponding to the field current that gives the maximum reduction amount of the inductance of the field winding with respect to an increasing amount of the field current in a range that the current can take and is less than 100%.

A wind turbine is provided. The wind turbine comprises: a generator (162), one or more power converters (20) arranged between the generator and a point of connection to a main transformer (5), and one or more wind turbine electrical components (8, 9, 10). The main transformer (5) is configured to connect a busbar (60) to an auxiliary wind turbine transformer, wherein the busbar is configured to receive electrical power from an electrical grid with a main voltage. The wind turbine electrical components are configured to be connected to the auxiliary wind turbine transformer (6), wherein a selection of the wind turbine electrical components is further configured to be connected to the busbar through a service voltage transformer (7) when the main transformer (5) is disconnected from the busbar. Systems comprising such wind turbines are also provided. Methods for connecting a wind turbine main transformer to a grid are also provided.

A wind turbine is provided. The wind turbine comprises: a generator (162), one or more power converters (20) arranged between the generator and a point of connection to a main transformer (5), and one or more wind turbine electrical components (8, 9, 10). The main transformer (5) is configured to connect a busbar (60) to an auxiliary wind turbine transformer, wherein the busbar is configured to receive electrical power from an electrical grid with a main voltage. The wind turbine electrical components are configured to be connected to the auxiliary wind turbine transformer (6), wherein a selection of the wind turbine electrical components is further configured to be connected to the busbar through a service voltage transformer (7) when the main transformer (5) is disconnected from the busbar. Systems comprising such wind turbines are also provided. Methods for connecting a wind turbine main transformer to a grid are also provided.

A rotary electrical machine including an annular stator having a stator core around which an armature winding is wound, and a rotor arranged on an inner circumference of the stator, a permeance of a q-axis magnetic circuit is made larger than a permeance of a d-axis magnetic circuit. The machine includes a switch for supplying power to a field winding and controller. The controller calculates the duty ratio on the condition that an upper limit of the duty ratio of the switch is a predetermined value and turns on/off the switch based on the calculated ratio. The predetermined value is set to a value larger than the duty ratio corresponding to the field current that gives the maximum reduction amount of the inductance of the field winding with respect to an increasing amount of the field current in a range that the current can take and is less than 100%.