Active impedance-injection module enabled for distributed power flow control of high-voltage (HV) transmission lines is disclosed. The module uses transformers with multi-turn primary windings, series-connected to high-voltage power lines, to dynamically control power flow on those power lines. The insertion of the transformer multi-turn primary is by cutting the line and splicing the two ends of the winding to the ends of the cut high-voltage transmission line. The secondary winding of the transformer is connected to a control circuit and a converter/inverter circuit that is able to generate inductive and capacitive impedance based on the status of the transmission line. The module operates by extracting power from the HV transmission line with the module floating at the HV transmission-line potential. High-voltage insulators are typically used to suspend the module from transmission towers, or intermediate support structures. It may also be directly suspended from the HV transmission line.

A converter arrangement has a converter which can be switched between an AC network and a DC voltage circuit and which has power semiconductor valves that extend between AC voltage connections and DC voltage connections. Each power semiconductor valve has a series connection of bipolar submodules that in turn include power semiconductor devices. The arrangement further includes a star point reactor which is arranged on the AC voltage side of the converter and has impedance coils that are connected to a grounded neutral point. In order to better balance the voltages in the DC circuit, the impedance coils have a common coil core.

Active impedance-injection module enabled for distributed power flow control of high-voltage (HV) transmission lines is disclosed. The module uses transformers with multi-turn primary windings, series-connected to high-voltage power lines, to dynamically control power flow on those power lines. The insertion of the transformer multi-turn primary is by cutting the line and splicing the two ends of the winding to the ends of the cut high-voltage transmission line. The secondary winding of the transformer is connected to a control circuit and a converter/inverter circuit that is able to generate inductive and capacitive impedance based on the status of the transmission line. The module operates by extracting power from the HV transmission line with the module floating at the HV transmission-line potential. High-voltage insulators are typically used to suspend the module from transmission towers, or intermediate support structures. It may also be directly suspended from the HV transmission line.

An apparatus, method and system are provided for use with (i) a three phase transmission line adapted for unbalanced loads leading to (ii) an alternating current (AC) grid in a geographically remote location, and intended to deliver energy having predefined qualities. The apparatus includes an AC-DC converter system operatively coupled to the transmission line, which is adapted to receive input AC power having one or more phases delivered by the transmission line and configured to convert the input AC power into direct current (DC) power. The apparatus further includes a DC bus and battery adapted to receive and store DC power from the AC-DC converter and a DC-AC converter system operatively coupled to receive power from, the AC-DC converter system or the battery, to convert said received power into AC power having the predefined qualities and adapted to deliver the AC power to the remote AC grid.

The present invention is directed, in part, to electrical components and methods of use associated with such components. In particular, the invention relates to an electrical device and methods of converting the use of 120 VAC electrical power into 240 VAC electrical power in order to power 240 VAC-requiring equipment and appliances. The electrical system includes at least two 120 VAC electrical cords and plugs, at least one 240 VAC outlet, a plurality of electrical switches and coils managed by a plurality of electrical relays within a central housing unit. The housing unit includes hot side, neutral side and ground wiring that transfer 120 VAC electrical power through the plurality of switches so that the power is safely routed to a 240 VAC outlet for use in powering 240 VAC-requiring equipment and appliances. As a safety feature, the invention further includes a plug circuit breaker that will break the electrical circuit within either a 120 VAC or 240 VAC plug.

Disclosed is a method for operating a three-phase inverter on a three-phase load. The three-phase inverter has a direct voltage intermediate circuit, at least one three-phase bridge circuit, and at least one control unit for controlling the bridge circuit. In the at least one bridge circuit, at least two power switches per phase are provided, which are connected in series parallel to the direct voltage intermediate circuit. Depending on predefined target voltage values of the three phases of the inverter, the power switches of each individual phase are actuated via the control unit such that a three-phase alternating voltage is generated on the three-phase load via switching operations of the power switches. Very good dynamic control behaviour can be achieved despite cost-effective dimensioning of the IGBT power switches of the three-phase bridge circuit.

A device determines a first current, of a first input phase of a power system, and a second current, of a second input phase of the power system. The device determines whether the first input phase and the second input phase are balanced based on the first current and the second current. When the first input phase and the second input phase are not balanced, the device selects the first input phase and an output phase of the power system. The device balances the first input phase and the second input phase by using the first input phase and the output phase.

A method for controlling a supply of at least one load with voltage and/or electric current through an electric network.

Various embodiments relate to power distribution systems. A power distribution system may include a switching unit configured to receive power from a plurality of sources, each source of the plurality of sources configured to supply power at a phase offset from a phase of every other source. The power distribution system may also include a plurality of loads. Furthermore, the power distribution system may include at least one monitoring unit configured to selectively couple, via the switching unit, each load of the plurality of loads to a source of the plurality of sources based on at least one of a current power demand of the plurality of loads and a predicted demand of the plurality of loads.

A method for characterizing the power consumption of a data center includes the steps of measuring one or more power consumption parameters associated with the data center when no workload is present, generating one or more workloads in the data center in which one or more three phase PDUs include an imbalanced phase, measuring one or more power consumption parameters associated with the data center during the one or more generated workflows, and characterizing the power consumption of the data center due to phase imbalance of the one or more three phase PDUs based on the measurements. By characterizing the power consumption of the data center due to phase imbalance based on empirical measurements, an accurate characterization of the power consumption attributable to phase imbalance can be achieved.