The present disclosure relates to an over-voltage prevention apparatus and method of a distribution line connected with a distributed generator, which sets a range of a dispatched voltage based on a current voltage of a Pole Mounted Automatic Voltage Regulator (PVR) and a voltage at a connection point of a distributed generator to control so that the dispatched voltage is output within the corresponding range.

The present disclosure relates to an over-voltage prevention apparatus and method of a distribution line connected with a distributed generator, which sets a range of a dispatched voltage based on a current voltage of a Pole Mounted Automatic Voltage Regulator (PVR) and a voltage at a connection point of a distributed generator to control so that the dispatched voltage is output within the corresponding range.

An assembly for connection to a high-voltage system has multiple single-phase transformers each having a transformer tank which is filled with a fluid and in which a core with at least one winding is situated. At least some of the windings of the single-phase transformers are connected to one another, forming a neutral point. A short-circuit voltage curve or impedance of the assembly can be adapted to different requirements. The windings are each connected to the neutral point via a switchover unit and a choke winding. The choke winding has multiple tappings, and the switchover unit is configured to select the tapping via which the winding in question is connected to the neutral point.

A system for an electrical power distribution network receives electricity from one or more distributed energy resources. The system includes a voltage regulation device configured to maintain a voltage in the electrical power distribution network within a range of voltages, the voltage regulation device including a voltage sampling module configured to obtain an indication of a voltage in the electrical power distribution network; and a control system coupled to the voltage regulation device, the control system configured to: determine a metric related to a time rate of change of the voltage in the power distribution network based on at least two samples of the voltage in the electrical power distribution network obtained at different times; and change at least one operating parameter and/or an operating mode of the voltage regulation device based on the determined rate of change of the voltage.

A system for an electrical power distribution network receives electricity from one or more distributed energy resources. The system includes a voltage regulation device configured to maintain a voltage in the electrical power distribution network within a range of voltages, the voltage regulation device including a voltage sampling module configured to obtain an indication of a voltage in the electrical power distribution network; and a control system coupled to the voltage regulation device, the control system configured to: determine a metric related to a time rate of change of the voltage in the power distribution network based on at least two samples of the voltage in the electrical power distribution network obtained at different times; and change at least one operating parameter and/or an operating mode of the voltage regulation device based on the determined rate of change of the voltage.

A power supply system comprises a primary regulation system, a secondary regulation system, and a controller. The primary regulation system comprises a primary transformer and a primary tap switch array. The secondary regulation system comprising a secondary transformer and an adjustment power signal generator. The controller is configured to control the adjustment power signal generator to apply an adjustment power signal to the secondary transformer. The secondary transformer is configured to combine the adjustment power signal with a base power supply signal from the primary transformer.

A power supply system comprises a primary regulation system, a secondary regulation system, and a controller. The primary regulation system comprises a primary transformer and a primary tap switch array. The secondary regulation system comprising a secondary transformer and an adjustment power signal generator. The controller is configured to control the adjustment power signal generator to apply an adjustment power signal to the secondary transformer. The secondary transformer is configured to combine the adjustment power signal with a base power supply signal from the primary transformer.

An apparatus includes a first winding and a second winding on a core and having first taps coupled in common to a first node of an inverter circuit. The apparatus further includes a switching circuit configured to selectively couple a second tap of the first winding to a second node of the inverter circuit and to selectively couple a second tap of the second winding to a third node of the inverter circuit. The switching circuit may be configured to provide a desired balance of first and second voltages at respective ones of the second and third nodes with respect to the first node. Related methods are also described.

An apparatus includes a first winding and a second winding on a core and having first taps coupled in common to a first node of an inverter circuit. The apparatus further includes a switching circuit configured to selectively couple a second tap of the first winding to a second node of the inverter circuit and to selectively couple a second tap of the second winding to a third node of the inverter circuit. The switching circuit may be configured to provide a desired balance of first and second voltages at respective ones of the second and third nodes with respect to the first node. Related methods are also described.

A method for controlling a value of a voltage at a conductor to which at least one secondary winding of a first steppable transformer and a secondary winding of a second steppable transformer are connected is provided. The method includes: if a voltage deviation of the voltage at the conductor from a voltage setpoint value is within a first range around the voltage setpoint value, and if an overall deviation of a sum of the voltage deviation and a reactive current deviation from the voltage setpoint value respectively for the first and the second transformer is outside of a second range, which is larger than the first, around the voltage setpoint value: setting a delay time for stepping the first transformer and/or the second transformer in such a way that stepping of the first or the second transformer that counteracts the voltage deviation is prioritized.