A transformer for adjusting the voltage supplied to a load, the transformer comprising a primary winding connectable to a primary AC electrical supply and a secondary winding connectable in series between a live supply and a load. The primary winding comprises a switching means operable to change the number of turns of the primary winding connectable to the primary AC electrical supply where the number of turns of the primary winding connectable to the primary AC electrical supply is greater than a number of turns in the secondary winding. The switching means comprises one or more solid state switches.

Disclosed are a grid-connected power conversion system and a control method thereof. The grid-connected power conversion system includes a fuel cell stack generating a DC voltage, a power conversion system (PCS) converting the DC voltage supplied from the stack into an AC voltage, a multi-input transformer including a primary coil having a plurality of voltage input terminals and a secondary coil transforming a magnitude of the voltage applied to the primary coil and outputting the transformed voltage, the plurality of voltage input terminals determining the number of turns of the primary coil differently from each other, one of the plurality of voltage input terminals receiving the AC voltage converted in the PCS, and a controller selecting the one of the plurality of voltage input terminals of the multi-input transformer based on the magnitude of the DC voltage generated from the stack and determining whether to replace the stack.

An isolation transformer boost system. The system including a power supply and an isolation transformer. The isolation transformer including a primary winding electrically connected to the power supply, a secondary winding, a first voltage tap, and a second voltage tap. The isolation transformer is configured to, in response to a command from an electronic processor, disconnect a connection from the first voltage tap and establish a second connection from the second voltage tap.

Disclosed are various embodiments for a control system for motor/generator comprising: a controller configured to receive sensor input related to rotation of a plurality of coils relative to a throat of a partial toroidal magnetic cylinder, and energize the coils based on the sensor input.

Disclosed are various embodiments for a control system for motor/generator comprising: a controller configured to receive sensor input related to rotation of a plurality of coils relative to a throat of a partial toroidal magnetic cylinder, and energize the coils based on the sensor input.

A transformer arrangement includes a first and a second arrangement side and a transformer with first windings coupled to the first arrangement side and with second windings having a first to a fourth tap. The transformer arrangement comprises a converter coupling the first, second and third tap to the second arrangement side, a first filter circuit coupling the first tap to the third tap and a second filter circuit coupling the third tap to the second tap.

Transformer power management controllers and transformer power management methods are described. According to one aspect, a transformer power management controller includes processing circuitry configured to monitor an electrical characteristic of electrical energy which is received from a secondary of a transformer of an electric power system, use the monitored electrical characteristic to determine transformer loading information which is indicative of an amount of power which is being supplied by the secondary of the transformer to a plurality of loads which are coupled with the secondary of the transformer, and use the transformer loading information to adjust an amount of the electrical energy which is supplied by the secondary of the transformer to at least one of the loads which is coupled with the secondary of the transformer.

Transformer power management controllers and transformer power management methods are described. According to one aspect, a transformer power management controller includes processing circuitry configured to monitor an electrical characteristic of electrical energy which is received from a secondary of a transformer of an electric power system, use the monitored electrical characteristic to determine transformer loading information which is indicative of an amount of power which is being supplied by the secondary of the transformer to a plurality of loads which are coupled with the secondary of the transformer, and use the transformer loading information to adjust an amount of the electrical energy which is supplied by the secondary of the transformer to at least one of the loads which is coupled with the secondary of the transformer.

A method for providing frequency response for a plant coupled to an electric power grid, the plant having an intermittent energy source, comprising: measuring frequency of the power output from the plant and determining a first difference between the measured frequency and a frequency reference; measuring power output from the plant and storing the measured power output as a stored value; while the first difference is within a deadband, determining a second difference as a difference between a power reference and the measured power output; while the first difference indicates over-frequency, determining the second difference as a difference between the stored value and the measured power output; while the first difference indicates under-frequency, setting the second difference equal to the power reference; generating an error by limiting a sum of the first and second differences between error limits; generating a control signal; and, applying the control signal to the source.

The embodiments herein relate to a system (100) for controlling a 3-phase transformer device (101, T1, T2, T3). The system (100) comprises the 3-phase transformer device (101, T1, T2, T3) which comprises a primary side and an adjustable secondary side. The system (100) comprises at least one voltage sensor (S1, S2, S3) adapted to sense voltage at the primary side. The system (100) comprises a current sensor (S4) adapted to sense current through the adjustable secondary side, and a resistor (R1) connected in series with the current sensor (S4) at the adjustable secondary side. The system comprises a controller (103) adapted to obtain sensor data indicating the sensed voltage and the sensed current, and to control a parameter associated with the adjustable secondary side of the 3-phase transformer device (101, T1, T2, T3) based on the obtained sensor data.