Utility power regulation system using local voltage estimation and method for the same
AssigneeMitsubishi Electric Power Products, Inc.
InventorsShyam Sunder Ramamurthy, Christopher Joseph Lee, Michael James Fleming
Life of this patent
Estimating the term…
Abstract
A utility power regulation system includes a power converter configured to regulate one or more of a voltage and a power factor at the primary side of a step-up transformer, or at a load electrically connected to a load feeder line, based on an estimated primary-side line voltage signal. The system includes a voltage estimation circuit configured to estimate the primary-side line voltage signal from one or more signals received from a secondary-side voltage sensor, regulator line current signal, and a primary-side load feeder-line current sensor.
Claims20
A method for regulating utility power, comprising:
- receiving, from a primary-side load feeder-line current sensor, a load feeder-line current signal representative of current on a load feeder line electrically connected to a primary side of a transformer;
- receiving, via a secondary-side voltage sensor, a secondary-side voltage signal on a secondary side of the transformer;
- receiving a regulator-line current signal representative of current on a power regulator line supplied by a power converter electrically connected to the secondary side of the transformer;
- estimating a primary-side line voltage signal on a power line at the primary side of the transformer or at a load fed through the load feeder line based on a subsystem impedance, the secondary-side voltage signal at the power converter, the load feeder-line current signal, and the regulator-line current signal of the current supplied by the power converter;
- and
- regulating, via the power converter, one or more of a power line voltage and a power factor on the power line at the primary side of the transformer, or at the load that is electrically connected to the load feeder line, based on the primary-side line voltage signal.
A utility power regulation system, comprising:
- a power converter configured to regulate AC voltage on a power line that is connected to a primary side of a transformer via a power regulator line, the power converter is electrically connected to a secondary side of the transformer via the power regulator line;
- a secondary-side voltage sensor electrically connected to the power regulator line on the secondary side of the transformer, the secondary-side voltage sensor configured to measure a secondary-side voltage signal on the secondary side of the transformer at the power converter;
- a primary-side load feeder-line current sensor that is electrically connected to a load feeder-line and that measures a load feeder-line current signal representative of current on the load feeder-line connected to the power line;
- and
- a voltage estimation circuit configured to estimate a primary-side line voltage signal on the power line at the primary side of the transformer or at a load fed through the load feeder line based on a subsystem impedance, the secondary-side voltage signal at the power converter, the load power feeder-line current signal, and a regulator-line current signal representative of the current supplied by the power converter, wherein
- the power converter is configured to regulate one or more of a voltage and a power factor at the primary side of the transformer or at a load electrically connected to the load feeder line based on the primary-side line voltage signal estimated by the voltage estimation circuit.
Dependencies are inferred from the claim text.