A method and system to control distributed energy resources in an electric power system includes generation, storage and controllable loads. The system uses time synchronized measurements of voltage phasor and current phasors and their derivative information that may include real and reactive power to regulate and decouple both static and dynamic effects of real and reactive power flow through the local electric power system connected to the area electric power system. The method and system provides precise real and reactive power demand set point pairs; damping of real and reactive power fluctuations in the local electric power system; decoupling between real and reactive power demand response set points by means of a multivariable control system that uses time synchronized measurements of voltage and current phasors and their derivative information.

An electrical safety monitoring system is provided. The system includes an analog circuit having line inputs for hardwiring an L1, an L2, an L3, and a GND three-phase connections, the analog circuit configured to monitor if voltage exists between any two of the line inputs, a heartbeat circuit electrically connected to the analog circuit to provide a heartbeat signal indicative of voltage present on any of the line inputs, an isolated voltage source electrically connected to the heartbeat circuit to power the heartbeat circuit with a VDC+ and a VDC−, and a logic circuit in operative communication with the heartbeat circuit for monitoring input from the heartbeat circuit and decoding the input from the heart beat circuit. The isolated voltage source may be supplied by a programmable logic controller (PLC) and the logic circuit may be implemented within the same PLC as a function block.

A method of obtaining characteristic measurements K and α of an electrical system comprising at least two terminals, the method comprising: injecting a reference voltage at a first of the at least two terminals; measuring a voltage at a second of the at least two terminals to provide a measured voltage, the second terminal being connected to earth; measuring a ratio of amplitude between the injected reference voltage and the measured voltage to provide a K value; and measuring a phase angle difference between the injected reference voltage and the measured voltage to provide an angle value α.

Attributes of a power system having one or more distributed energy resources are characterized by continuously receiving data comprising a power data stream having at least two components and derived from at least one distributed energy resource. A control data stream comprising at least two components is generated. An error data stream is determined based on a difference between respective components of the power data stream to components of a reference data stream comprising at least two components. The error data stream and the reference data stream are processed to generate the control data stream. The control data stream is continuously output to enable control and/or monitoring of the power flow of at least one distributed energy resource.

A method for modelling load in a power grid is provided. The method includes obtaining measurement data from a measurement device in the power grid, identifying one or more voltage adjustment events in the power grid from the measurement data, and generating a load model based on one or more voltage factors computed using the one or more voltage adjustment events.

A method and a system for detecting and processing one or more deviations from an acceptable electrical behavior at a point of interest in an electrical network, the system comprising a voltage sensor and/or a current sensor, a measurement-processor configured to process measurements received from the at least one of a voltage sensor and a current sensor, at least one storage for storing one or more acceptable values related to the electrical behavior at the point of interest, and a deviation-processor, the deviation processor is configured to receive one or more detected values related to the electrical behavior at a point in time at the point of interest and detect one or more deviations between the one or more acceptable values and the one or more detected values, and analyze one or more deviations between the one or more acceptable values and the one or more detected values.

In accordance with an embodiment, an integrated circuit chip includes a first input configured to receive a rectified potential and a second input configured to receive a reference potential; a first circuit configured to maintain the rectified potential at a constant value on the first input; a second circuit having a power supply input coupled to the first node; a first resistor series-connected to the first circuit between the second input and the first node, or connected between the first input and the first node; a third circuit connected across the first resistor and configured to deliver a signal which is an image of a current in the first resistor; and a fourth circuit configured to determine a mains frequency and/or a mains voltage based at least on the signal which is the image of the current in the first resistor.

This application discloses an alternating-current energy detection apparatus, in which a voltage detection unit forms a coupling capacitance together with a tested cable, obtains a first voltage based on an actual voltage and the coupling capacitance, and outputs the first voltage to a data processing unit; a current detection unit detects a tested-cable current, and outputs the tested-cable current to the data processing unit; and the data processing unit receives the first voltage and the tested-cable current, and determines a first voltage value and a tested-cable current value; calculates a product of the first voltage value and a quantity of amplification times of a tested-cable voltage, and determines a tested-cable voltage value; and calculates, based on the tested-cable voltage value and the tested-cable current value, electric energy transmitted by the tested cable.

A method for a faulted line identification in a power network, including, at a generic time-instant, solving a plurality of parallel phasor measurement units based real-time state estimators, the state estimators having among each other different and augmented network topologies, each of the augmented network topologies comprises an original network topology, which includes a plurality of real buses and real lines forming a connected graph mapping the real network topology, and a single additional virtual bus located along one of the real lines, the line in which the virtual bus is located has to be different for each of the augmented network topologies.

A metering device for monitoring power flow at a premises includes a metering module that measures power flow on powerlines at a premises and provides power flow data characterizing the power flow on the powerlines. The metering device also includes a communication module coupled to the metering module that transmits power flow data to a node on a meter network. The metering device further includes an energy storage element coupled to the metering module and the communication module. The energy storage element provides backup power to the metering module and the communication module in response to a voltage on the powerlines dropping below a first threshold for a time interval exceeding a second threshold, such that the metering module measures the power flow on the powerlines and provide the power flow data for a backup interval of time.