Remote sensing and control at the point of common coupling in an electrical grid
AssigneeCaterpillar Inc.
InventorMarcelo C. Algrain
Life of this patent
Estimating the term…
Abstract
Techniques are described for compensating for differences in conditions at the PoC and PCC by determining an adjustment to a PoC setpoint that adjusts a value of an electrical parameter at the PCC so as to approximate or equal a PCC setpoint. In some examples, for voltage regulation and protection functions (mandatory trips), the voltages and/or currents are sensed at the PCC (remote sensing) and fed to a DER controller to produce the appropriate action. For power delivery at the PCC, active and reactive power can be sensed at the PCC and measurements are fed to the DER controller.
Claims20
A system for controlling a distributed energy resource (DER) at an electrical interconnection between an electric utility grid and a customer's electrical system, the system comprising:
- a point of common coupling (PCC) coupled between the electric utility grid and a first electric bus;
- a point of connection (PoC) coupled between the customer's electrical system and a second electric bus, wherein the PoC and the PCC are electrically coupled;
- a sensor electrically coupled with the PCC and configured for measuring an electrical parameter at the PCC;
- and
- a DER local controller configured for:
- determining, based on the measured electrical parameter at the PCC, an adjustment to a PoC power setpoint to adjust a value of the electrical parameter at the PCC so as to approximate or equal a PCC power setpoint;
- and
- generating a control signal to adjust an electrical parameter at the PoC to achieve the adjusted PoC power setpoint.
A method for controlling a distributed energy resource (DER) at an interconnection between an electric utility grid and a customer's electrical system, the method comprising:
- measuring an electrical parameter at a point of common coupling (PCC), wherein the PCC is coupled between the electric utility grid and a first electric bus,
- to compensate for electrical differences the PCC and a point of connection (PoC) coupled between the customer's electrical system and a second electric bus, determining, using a DER local controller and based on the measured electrical parameter at the PCC, an adjustment to a POC power setpoint to achieve a PCC power setpoint;
- and
- generating, using the DER local controller, a control signal to adjust an electrical parameter at the PoC to achieve the adjusted PoC power setpoint.
A system for controlling a distributed energy resource (DER) at an electrical interconnection between an electric utility grid and a customer's electrical system, the system comprising:
- a point of common coupling (PCC) coupled between the electric utility grid and a first electric bus;
- a point of connection (PoC) coupled between the customer's electrical system and a second electric bus, wherein the PoC and the PCC are electrically coupled;
- an electrical impedance coupled between the PCC and the PoC;
- a sensor electrically coupled with the PCC and configured for measuring an electrical parameter at the PCC;
- and
- a DER local controller configured for:
- determining, based on the measured electrical parameter at the PCC, an adjustment to a PoC power setpoint to adjust a value of the electrical parameter at the PCC so as to approximate or equal a PCC power setpoint, and
- generating a control signal to adjust an electrical parameter at the PoC to achieve the adjusted PoC power setpoint to compensate for losses due to the electrical impedance.
Dependencies are inferred from the claim text.