A system contains a double fed induction machine having a stator and a rotor, a fly wheel coupled to the rotor, and a control device for providing a rotor voltage and a rotor current to the rotor. The control device is connected to the rotor and the stator and is capable of generating the rotor voltage and rotor current in response to an electrical signal that is applied to the stator. The control device has a multilevel converter and a control unit for controlling the multilevel converter.

A system includes a clutchless synchronous condensing coupling configured to couple a turbine shaft of a gas turbine system to a generator shaft of a synchronous generator of a power generation system. The clutchless synchronous condensing coupling includes a first coupling portion configured to couple to the turbine shaft, and a second coupling portion configured to couple to the generator shaft. The clutchless synchronous condensing coupling is configured to allow the power generation system to operate in an active power mode and a reactive power mode without a clutch assembly.

A system and method are provided for controlling a power generating facility. Accordingly, the facility-level controller determines a reactive-power-delivery coefficient for each power generating asset of the power generating facility. The reactive-power-delivery coefficient includes at least one of a reactive-power-generation coefficient and a reactive-power-transmission coefficient. The reactive-power-delivery coefficient is indicative of an impact on the active power production capability of each of the power generating assets due to a change in an amount of reactive power delivered to a point of interconnect. Based at least in part on the reactive-power-delivery coefficient, the facility-level controller determines a portion of a demand signal to be satisfied by each of the power generating assets.

The present application thus provides a method of operating a synchronous condenser. The method may include the steps of accelerating a gas turbine engine to full speed no load conditions, connecting a generator attached to the gas turbine engine to an electric power grid, turning off a flow of fuel to the gas turbine engine, operating the generator in a synchronous condenser mode, and providing or absorbing reactive power to or from the electric power grid.

A system and method are provided for controlling low-speed operations of a wind turbine electrically coupled to an electrical grid. The wind turbine includes a generator and a power converter. The generator includes a generator rotor and a generator stator. An operating parameter of the generator rotor is indicative of a low-speed operation of the generator. Accordingly, the crossing of a first threshold by the operating parameter is detected. In response, at least a portion of a required reactive power generation is developed via the generator rotor. The portion is then delivered to the electrical grid via the grid side of the power converter.

The present invention relates to a method for operating a wind power facility in order to provide reactive power support to a power grid, the method comprising the step of increasing an amount of reactive power injected into the power grid, decreasing an amount of active power injected into the power grid by a certain amount, and dissipating and/or storing essentially said certain amount of active power in power dissipation and/or power storage means. The wind power facility may comprise a wind turbine or a wind power plant.

A method for controlling a power system includes generating, via at least one inverter-based resource, one or more command signals via a regulator of at least one inverter-based resource of the power system. Further, the method includes dynamically estimating, via the at least one inverter-based resource, a reactive power capability of the at least one inverter-based resource based, at least in part, on the one or more command signals. Further, the method includes sending, via the at least one inverter-based resource, the reactive power capability to the system-level controller. Thus, the method includes controlling the power system based on the reactive power capability.

Embodiments are generally directed to techniques for operating a wind turbine of a wind power plant. An associated method comprises determining, using one or more sensors of the wind turbine, a first power production level of the wind turbine; determining, during an unconstrained operation of the wind turbine, one or more available power correction factors using the first power production level; determining, using one or more wind power parameters applied to a predefined model for estimating an available power of the wind turbine, an estimated available power value; adjusting the estimated available power value using the one or more available power correction factors to produce the available power value; and controlling, using the available power value, the wind turbine to produce a second power production level.

A system includes a power distribution bus configured to distribute power from an electrical power source. The system also includes a plurality of electrical loads configured to receive portions of the power from the electrical power source. The system further includes a doubly-fed induction machine (DFIM) configured to reduce transmission impedance on the power distribution bus in response to a change in real or reactive power at one or more of the electrical loads, and reduce low frequency power oscillations at the source.

A system includes a power distribution bus configured to distribute power from an electrical power source. The system also includes a plurality of electrical loads configured to receive portions of the power from the electrical power source. The system further includes a doubly-fed induction machine (DFIM) configured to reduce transmission impedance on the power distribution bus in response to a change in real or reactive power at one or more of the electrical loads, and reduce low frequency power oscillations at the source.