Aspects of the invention overcome a monolithic approach to conventional low-frequency LPTs by using a high-frequency solid-state alternating current ac/ac modular power-conversion approach. Embodiments of the invention enable the ability to incorporate new technologies without in all cases redoing a LPT design from scratch. Furthermore, given that LPTs are for the long term, aspects of the invention ensure that they are durable, efficient, and fault tolerant with overloading capability.

An electrical power distribution network includes: a plurality of electrical power control apparatuses, each of which include one or more signal conversion components receiving electrical power in the form of a first signal and generating a corresponding second signal, a controller that controls operation of the signal conversion components, electrical power generation components acting as sources of electrical power to at least some of the electrical power control apparatuses, and electrical power consumption components acting as sinks of electrical power from at least some of the electrical power control apparatuses. The electrical power control apparatuses operate autonomously but are interconnected so that the electrical power control apparatuses collectively maintain the voltages and frequencies of electrical power signals flowing through the electrical power distribution network at target values to compensate for variations in the sinks and/or sources of electrical power.

An electrical power distribution network includes: a plurality of electrical power control apparatuses, each of which include one or more signal conversion components receiving electrical power in the form of a first signal and generating a corresponding second signal, a controller that controls operation of the signal conversion components, electrical power generation components acting as sources of electrical power to at least some of the electrical power control apparatuses, and electrical power consumption components acting as sinks of electrical power from at least some of the electrical power control apparatuses. The electrical power control apparatuses operate autonomously but are interconnected so that the electrical power control apparatuses collectively maintain the voltages and frequencies of electrical power signals flowing through the electrical power distribution network at target values to compensate for variations in the sinks and/or sources of electrical power.

A voltage compensation device according to an embodiment includes a power converter, series transformers and a controller. The controller includes a first coordinate transformation circuit, a first arithmetic part, a second coordinate transformation circuit and a second arithmetic part. The first coordinate transformation circuit generates a first output and a second output that are mutually-orthogonal by performing a rotating coordinate transformation of the normal-phase components of a three phase alternate current. The first arithmetic part calculates a system voltage based on a direct current component of the first output and generates a first compensation amount corresponding to a compensation voltage set to compensate a shift of the system voltage from a preset target voltage. The second coordinate transformation circuit generates a third output and a fourth output that are mutually-orthogonal by performing a rotating coordinate transformation of reverse-phase components of the three-phase alternating current. The second arithmetic part generates second compensation amount of a reverse-phase component of the system voltage based on a direct current component of the third output and a direct current component of the fourth output. The first arithmetic part generates the first compensation amount to cause the compensation voltage when the system voltage is within a prescribed range to be less than the compensation voltage when the system voltage is outside the prescribed range.

A zero-sequence blocking transformer includes a first core part around which is wound a first winding and a second core part around which is wound a second winding, and a third core part to create an additional leakage flux path. The concept of this disclosure can be applied to any known core structure by adding an additional leakage flux component part. In the case of a known toroidal core, the additional component part may be a rod of magnetic material fitted into the gap between the two windings to intentionally create an additional leakage flux path. Alternatively, an EE core geometry can be used and the additional leakage flux path is created by forming an air gap or adding a magnetic material insert in the leg which does not carry a winding.

An uninterruptible power supply system includes: at least one AC input terminal; an AC output terminal; an DC input terminal; at least one uninterruptible power supply (UPS) device having: a DC link; a DC/AC converter connecting on a first side to the DC link and on a second side to the AC output terminal; and a DC/DC converter connecting on a first side to the DC input terminal and on second side to the DC link. The uninterruptible power supply system further includes at least two switches; and at least one coupled differential mode inductor having two windings. Each switch of the at least two switches is connected in series with at least one winding of the at least one coupled differential mode inductor forming a series connection. The series connection is connected on a first side to the at least one AC input terminal.

Systems and methods for an alternating current (AC) input selection for a power transformer are disclosed. In particular, a connector is provided that is pre-wired to utilize internal wiring in the power transformer to provide a desired connection. A first option allows two transformers' input winding to be in series while a second option allows the two transformers' input winding to be in parallel. By moving the wiring into the connector, installation is simplified as the wiring has already been done. The installer need only attach the correct plug based on the desired voltage and couple the plug to the transformer. Further, the manipulation of thick wires is also avoided by the installer, further simplifying the installation process.

A system for plasma ignition and maintenance of an atmospheric pressure plasma. The system has a variable frequency alternating current (AC) power source, a transformer, a cable connected to a secondary winding of the transformer, a programmed microprocessor for control of power to the atmospheric pressure plasma. The microprocessor is configured to a) at pre-ignition, power the AC power source at an operational frequency f.sub.op higher than the resonant frequency f.sub.r, b) decrease the operational frequency f.sub.op of the AC power source until there is plasma ignition, and c) after the plasma ignition, further decrease the operational frequency f.sub.op of the AC power source to a frequency lower than the resonant frequency f.sub.r.

The present disclosure provides an electrical generator within an engine that includes a permanent magnet that emits a first magnetic field and is disposed on a first shaft; a first winding connected to a second shaft such that the first winding is positioned within the first magnetic field; a field winding disposed on the second shaft such that the field winding generates a second magnetic field that rotates as first shaft rotates relative to the second shaft; a second winding disposed on the first shaft, the second winding being positioned to receive the second magnetic field and provide a resonant emitter with an electrical power input to generate a third magnetic field when the first shaft rotates relative to the second shaft; and a resonant receiver disposed on an enclosure of the engine, positioned to receive the third magnetic field and convert the third magnetic field into an electrical output.

The present disclosure provides an electrical generator within an engine that includes a permanent magnet that emits a first magnetic field and is disposed on a first shaft; a first winding connected to a second shaft such that the first winding is positioned within the first magnetic field; a field winding disposed on the second shaft such that the field winding generates a second magnetic field that rotates as first shaft rotates relative to the second shaft; a second winding disposed on the first shaft, the second winding being positioned to receive the second magnetic field and provide a resonant emitter with an electrical power input to generate a third magnetic field when the first shaft rotates relative to the second shaft; and a resonant receiver disposed on an enclosure of the engine, positioned to receive the third magnetic field and convert the third magnetic field into an electrical output.