A power generating system including a stator, a neutral line, a rectifier circuit and a power conversion circuit is provided. The stator has a plurality of phase coils configured to provide an AC power. The neutral line is coupled to a common point of the phase coils. The rectifier circuit is coupled between the phase coils and a power bus and is configured to convert the AC power to provide a DC power to the power bus. The power conversion circuit is coupled between the neutral line and the power bus, and is controlled by a control signal to convert a power of the neutral line and thereby provide a compensation power to the power bus to stabilize a voltage of the power bus. Alternatively, the power conversion circuit is controlled by the control signal to recuperate a power passing through a part of the rectifier circuit to the stator.

A power converter having a Scott-T transformer includes a direct current to alternating current converter configured to have at least two multilevel converters converting input direct current power to alternating current power, a Scott-T transformer configured to operate in medium frequency of several hundreds of Hz to several tens of kHz, to transform a voltage level of the alternating current power from each of the at least two multilevel converters of the direct current to alternating current converter into three-phase alternating current power, and to output the three-phase alternating current power, and an alternating current to direct current converter configured to convert the three-phase alternating current power from the Scott-T transformer to direct current power.

A multi-phase shift transformer based AC-DC converter includes a single transformer that reflects a negative portion of an AC voltage to become a positive voltage by generating multiple phases from a poly-phase input. The multiple phases generated can be separated by as little as 1 to create a well-approximated DC output without the need for a smoothing circuit. The primary and second windings of the transformer are flat wire conductors structured to provide a larger number of windings per core including a larger number of secondary coils, which provides for a large number of output phases.

A power supply device that allows individual control of an output voltage of a main transformer and an output voltage of a teaser transformer while utilizing output characteristics of the respective transformer when a Scott connected transformer has control equipment arranged on the input side thereof, including first control equipment arranged in one of two phases of the main transformer on the input side in order to control a voltage or a current and second control equipment arranged in one end of a primary coil of the teaser transformer on the input side in order to control a voltage or a current, the control equipment controlling an output voltage of the main transformer and an output voltage of the teaser transformer individually.

A power supply device that allows individual control of an output voltage of a main transformer and an output voltage of a teaser transformer while utilizing output characteristics of the respective transformer when a Scott connected transformer has control equipment arranged on the input side thereof, including first control equipment arranged in one of two phases of the main transformer on the input side in order to control a voltage or a current and second control equipment arranged in one end of a primary coil of the teaser transformer on the input side in order to control a voltage or a current, the control equipment controlling an output voltage of the main transformer and an output voltage of the teaser transformer individually.

For a power supply with a reduced number of semiconductor devices, a phase shifting transformer receives a three-phase primary voltage and steps the three-phase primary voltage one of up and down to a secondary voltage with a plurality of secondary winding sets. There is phase shifting between different secondary winding sets. A plurality of power cell sets each comprise a plurality of power cells cascaded connected, and each power cell receives one of a single phase and a three-phase voltage of a distinct secondary winding set of the phase shifting transformer. Each power cell comprises no more than eight power semiconductor devices organized as a rectifier and an inverter. Each power semiconductor device is one of a diode and an active switch. Each power cell set generates one phase of a three-phase alternating current output.

A novel 72-pulse AC-DC converter based on a 36-pulse converter is designed and implemented in this invention. Combining the outputs of two parallel 18-pulse diode bridges, consisting of nine legs of diode rectifiers, results in a 36-pulse topology. A zero sequence blocking transformer (ZSBT) is designed and applied to the proposed scheme guarantying the independent operation of the two bridges. To achieve a 72-pulse output, a pulse doubling circuit is applied which is inherently a tapped inter-phase transformer. A polygon-connected autotransformer platform is designed and added to the converter, making the proposed scheme suitable for retrofit applications. The proposed solution is a tradeoff among the pulse number, the transformer platform, the complexity of the scheme and the cost. The proposed scheme has an optimized configuration in this regard. The simulation results show that the proposed scheme improves the power quality indices.

A novel 72-pulse AC-DC converter based on a 36-pulse converter is designed and implemented in this invention. Combining the outputs of two parallel 18-pulse diode bridges, consisting of nine legs of diode rectifiers, results in a 36-pulse topology. A zero sequence blocking transformer (ZSBT) is designed and applied to the proposed scheme guarantying the independent operation of the two bridges. To achieve a 72-pulse output, a pulse doubling circuit is applied which is inherently a tapped inter-phase transformer. A polygon-connected autotransformer platform is designed and added to the converter, making the proposed scheme suitable for retrofit applications. The proposed solution is a tradeoff among the pulse number, the transformer platform, the complexity of the scheme and the cost. The proposed scheme has an optimized configuration in this regard. The simulation results show that the proposed scheme improves the power quality indices.

A multi-phase transformer. The multi-phase transformer includes a single rectifier; and a plurality of groups of windings connected to the single rectifier. Each one of the plurality of groups of windings comprises: a corresponding plurality of primary windings having a first output voltage; a corresponding plurality of secondary windings having a second output voltage; and a corresponding plurality of tertiary windings having a third output voltage that is higher than the second output voltage.

A multi-phase transformer. The multi-phase transformer includes a single rectifier; and a plurality of groups of windings connected to the single rectifier. Each one of the plurality of groups of windings comprises: a corresponding plurality of primary windings having a first output voltage; a corresponding plurality of secondary windings having a second output voltage; and a corresponding plurality of tertiary windings having a third output voltage that is higher than the second output voltage.