Non-fault disturbance-based method and system for measuring short-circuit capacity of a power grid on site including: connecting or disconnecting a reactive compensation device to or from a power grid point of common coupling, to generate a disturbance on a power grid; obtaining total active power and total reactive power of a load of the point of common coupling before the disturbance; determining a vector difference between a voltage of the power grid point of common coupling before the disturbance and a voltage of the power grid point of common coupling after the disturbance; obtaining a voltage effective value of the power grid point of common coupling before the disturbance; obtaining a capacity of the reactive compensation device; and determining a short-circuit capacity of the point of common coupling according to total active power, total reactive power, vector difference between voltages, voltage effective value, and capacity of the reactive compensation device.

A method for identifying report triggering events in a power grid to improve stability in the power grid is provided. Energy flow information in the power grid is measured and report triggering events during a predetermined period of time are identified. The report triggering events include at least a predetermined number of load flow transitions where energy flows back from a load associated with the power grid to the power grid during the predetermined period of time and/or exceeding a threshold of time where an energy flow phase angle between voltage and current remains at or near 90 or 270 degrees indicating pure volt-ampere reactive (VAR) operation during the predetermined period of time. A report associated with each of the identified report triggering events is generated and includes a location indicating where the report triggering event occurred in the power grid. The reports are transmitted.

A centralized voltage controller according to the present invention includes a voltage distribution determination unit that calculates a controlled amount in each of a plurality of voltage controllers on the basis of a measured value of a voltage at each point on a distribution line, a tap position determination unit that determines a change amount of a tap position to be given to each of a plurality of local voltage control units on the basis of the controlled amount, and a tap-change-amount management unit that limits the change amount when receiving, from the local voltage control unit, a limit signal indicating that a tap position in the voltage controller controlled by the local voltage control unit is an upper limit or a lower limit of a settable range.

A method for operating a power generation system that supplies real and reactive power to a grid includes receiving a reactive power demand made on the power generation system at an operating state of the power generation system and a grid state. Further, the method includes decoupling reactive power control and voltage control between a generator and a reactive power compensation device so as to reduce an oscillatory response of a reactive power output from the reactive power compensation device and the generator. Moreover, the method includes operating, via a device controller, the reactive power compensation device in a reactive power control mode to generate at least a portion of the reactive power demand.

The invention relates to a current-compensating device able to be connected, in shunt configuration, between an electrical network and non-linear and linear electrical loads and downstream of at least one renewable-energy-generating power unit coupled to an energy-storing element, the compensating device including: a power converting unit including at least one voltage inverter able to generate an AC current; an output filtering unit, including one filter dimensioned to block the harmonic components due to the switching of the inverter; a control unit comprising a unit for computing reference currents and a switch driving device that controls the switching of the inverter as a function of the identification of the currents by the unit for computing the reference currents.

Systems, methods, and devices relating to operating a power generation facility to contribute to the stability of the power transmission system. A controller operates on the power generation facility to modulate real power or reactive power or both in a decoupled manner to contribute to the stability of the power transmission system. Real power produced by the power generation facility can be increased or decreased between zero and the maximum real power available from the PV solar panels, as required by the power system. Reactive power from the power generation facility can be exchanged (injected or absorbed) and both increased or decreased as required by the power transmission system. For solar farms, the solar panels can be connected or disconnected, or operated at non-optimal power production to add or subtract real or reactive power to the power transmission system.

Systems and methods for improved anomaly detection for rotating machines. An example method may include determining that power generation is to be performed based on a voltage instead of a power factor; receiving a command voltage; receiving a measured voltage value from a first location in a power generation network; determining that the measured voltage value from the first location is less than the command voltage value; determining that a current value associated with a transmission line at the third location is less than a threshold current value; determining that a reactive power of a power generation component at a third location is less than a maximum reactive power of the component; and increasing, based on the determination that the reactive power of the component at the third location is less than a maximum reactive power of the component, the reactive power of the component.

Systems, methods, and devices are provided for controlling part of an electric power distribution system using an intelligent electronic device that may rely on communication from wireless electrical measurement devices. Wireless electrical measurement devices associated with different phases of power on an electric power distribution system may send wireless messages containing electrical measurements for respective phases to an intelligent electronic device. When wireless communication with one of the wireless electrical measurement devices becomes inconsistent or lost, the intelligent electronic device may synthesize the electrical measurements of the missing phase using electrical measurements of remaining phases. The intelligent electronic device may use the synthesized electrical measurements to control part of the electric power distribution system.

A method for the reduction in the electricity consumption of an electrical load (2) placed along an electric line (3), said method comprising the steps of: —determining a phase shift existing between the current and voltage along the electric line (3); —implementing the following procedure if said phase shift falls within a predetermined range: i) performing an interruption of current to the electrical load (2) of a duration less than a predetermined value; ii) modifying an electrical characteristic of an additional electrical load (6) as a function of the phase shift; iii) putting or maintaining said additional electrical load (6) in parallel with the electrical load (2).

A generating unit, GU, with an asynchronous generator with a direct connecting branch to a power grid; a measuring device for determining the profiles of a GU grid voltage and an GU grid current at the power grid; and power electronics connected in parallel with the asynchronous generator and the power grid. The power electronics including an inverter with an inverter output for direct connection to the generator power grid branch; an intermediate circuit energy storage device; and a control unit. Based on the grid current measured and the grid voltage measured, the control unit can determine a phase shift angle and the value of the grid current and, based on this, actuate the inverter such that the value and phase shift angle of the output current of the power electronics assume values that, together with the current of the asynchronous generator, result in a target phase shift angle.