Abstract: A method for preventing damage in a bearing of a generator of an electrical power system includes monitoring one or more electrical signals of a power conversion assembly of the electrical power system. The method also includes estimating an impedance path of common mode current from a terminal to ground using the operating parameter(s) of the power conversion assembly. Further, the method includes determining a one or more magnitudes and/or a one or more phase angles of the impedance path at different frequencies, such a switching frequency and/or harmonics. Moreover, the method includes determining whether the impedance path is indicative of degradation in at least one of bearing insulation or a ground brush of the generator based on a change in the one or more magnitudes and/or the one or more phase angles. In addition, the method includes implementing a control action when the impedance path is indicative of degradation in the bearing insulation and/or the ground brush of the generator.

Abstract: A system and method are provided for operating a power generating asset having a generator operably coupled to a power grid. The generator having a rotor and a stator. The stator being operably coupled to a transformer, and ultimately to the power grid, via a sync-switch assembly. The sync-switch assembly having a plurality of switching devices electrically coupled in parallel. Accordingly, a controller detects an approach of at least one operating parameter of the power generating asset to a first parameter threshold. In response to detecting the approach of the operating parameter to the first parameter threshold, the controller independently changes an operating state of a first switching device of the plurality of switching devices of the sync-switch assembly. Each switching device of the plurality of switching devices is independently controllable via the controller.

Abstract: A method for controlling an inverter-based resource having an asynchronous machine connected to a power grid to provide grid-forming control of the inverter-based resource includes coupling at least one additional device to terminals of a first converter of the inverter-based resource. Further, the method includes emulating, via a controller, at least one of the at least one additional device or the first converter as a first virtual synchronous machine. Moreover, the method includes coordinating, via the controller, operation of the first virtual synchronous machine and a second converter of the inverter-based resource using a vector-control approach to control at least one of voltage and frequency at a point of interconnection between the inverter-based resource and the power grid in a closed loop manner.

Abstract: The invention concerns a method for controlling a hybrid power generation plant comprising a plurality of power sources among a hydro plant, a solar plant and a battery storage system, said method comprising: receiving from a grid to which the plant is connected at least one data among a power demand, a peak hour, a frequency, a ramp, a reactive power, a voltage; varying a power production of at least one of the plurality of power sources, depending on said at least one data received from the grid and at least one characteristic of each of said plurality of power sources.

Abstract: A system and method are provided for controlling a wind turbine. Accordingly, a controller of the wind turbine detects an oscillation in the power output of the wind turbine during a recovery from a transient event. In response to detecting the oscillation, a portion of the power output during a peak phase of the oscillation is stored in an energy storage device. A portion of the stored power is then discharged during a valley phase of the oscillation in order to reduce an amplitude of the oscillation of the power output that is delivered to the power grid.

Abstract: The system and method described herein provide grid-forming control of a power generating asset having a double-fed generator connected to a power grid. Accordingly, a stator-frequency error is determined for the generator. The components of the stator frequency error are identified as a torsional component corresponding to a drivetrain torsional vibration frequency and a stator component. Based on the stator component, a power output requirement for the generator is determined. This power output requirement is combined with the damping power command to develop a consolidated power requirement for the generator. Based on the consolidated power requirement, at least one control command for the generator is determined and an operating state of the generator is altered.

Abstract: A system for controlling a hybrid power generation plant is provided. The system is programmed to receive current conditions at the plurality of power generating assets including a first asset type and a second asset type, determine a forecast for a period of time based at least in part on the current conditions, determine that a first asset of the first asset type of the plurality of power generating assets has an available uprate margin for production of a first amount of active power, determine that a second asset of the second asset type of the plurality of power generating assets has capacity to generate a second amount of reactive power, instruct the first asset to reduce production of reactive power by the second amount and increase production of active power by the first amount, and instruct the second asset to increase production of reactive power by the second amount.

Abstract: A method for operating an asynchronous inverter-based resource connected to a power grid as a virtual synchronous machine to provide grid-forming control thereof includes receiving a frequency reference command and/or a voltage reference command. The method also includes determining at least one power reference signal for the inverter-based resource based on the frequency reference command and/or the voltage reference command. Further, the method includes generating at least one current vector using the power reference signal(s). Moreover, the method includes determining one or more voltage control commands for the inverter-based resource using the at least one current vector.

Abstract: A method for controlling an inverter-based resource having an asynchronous machine connected to a power grid to provide grid-forming control of the inverter-based resource includes coupling at least one additional device to terminals of a first converter of the inverter-based resource. Further, the method includes emulating, via a controller, at least one of the at least one additional device or the first converter as a first virtual synchronous machine. Moreover, the method includes coordinating, via the controller, operation of the first virtual synchronous machine and a second converter of the inverter-based resource using a vector-control approach to control at least one of voltage and frequency at a point of interconnection between the inverter-based resource and the power grid in a closed loop manner.

Abstract: A system and method are provided for controlling a wind turbine. Accordingly, a controller of the wind turbine detects a transient grid event and generates a torque command via a drive-train-damper control module. The torque command is configured to establish a default damping level of a torsional vibration resulting from the transient grid event. The controller also determines at least one oscillation parameter relating to the torsional vibration and determines a target generator torque level based thereon. The target generator torque level corresponds to an increased level of damping the torsional vibration relative to the default damping level.

Abstract: A system and method are provided for operating a power generating asset having a generator operably coupled to a power grid. The generator having a rotor and a stator. The stator being operably coupled to a transformer, and ultimately to the power grid, via a sync-switch assembly. The sync-switch assembly having a plurality of switching devices electrically coupled in parallel. Accordingly, a controller detects an approach of at least one operating parameter of the power generating asset to a first parameter threshold. In response to detecting the approach of the operating parameter to the first parameter threshold, the controller independently changes an operating state of a first switching device of the plurality of switching devices of the sync-switch assembly. Each switching device of the plurality of switching devices is independently controllable via the controller.

Abstract: A system and method are provided for controlling a wind turbine. Accordingly, a controller of the wind turbine detects an oscillation in the power output of the wind turbine during a recovery from a transient event. In response to detecting the oscillation, a portion of the power output during a peak phase of the oscillation is stored in an energy storage device. A portion of the stored power is then discharged during a valley phase of the oscillation in order to reduce an amplitude of the oscillation of the power output that is delivered to the power grid.

Abstract: A method for controlling a voltage source power converter of a renewable energy power conversion system includes providing the voltage source power converter having, at least, a rotor-side converter and a line-side converter. The method also includes generating, via a converter controller, a first set of switching pulses based on a third-harmonic phase opposition carrier-based pulse width modulation (PO_CB_PWM) scheme. Further, the method includes generating, via the converter controller, a second set of switching pulses based on a third-harmonic in phase carrier-based pulse width modulation (IP_CB_PWM) scheme. As such, the method includes implementing, via the converter controller, a pulse-width modulation scheme for the rotor-side and line-side converters using the first and second sets of switching pulses, respectively, to obtain an output voltage from the voltage source converter to a desired magnitude, shape, and/or frequency.

Abstract: A hybrid power plant including a plurality of power sources and controllers, a hybrid plant controller, and a computing system. The controllers operate the power sources according to operating set points. The hybrid plant controller transmits the operating set points to the controllers. The computing system is coupled to the hybrid plant controller and receives a first set of input parameters from a first subscriber, and carries out a first level of services to which the first subscriber subscribes to determine operating parameters for the first subscriber. The computing system receives a second set of input parameters from a second subscriber and carries out a second level of services to which the second subscriber subscribes to determine operating parameters for the second subscriber. The computing system then computes the operating set points based on aggregate operating parameters for the first and second subscribers.

Abstract: A hybrid power generation system is presented. The hybrid power generation system includes a generator operable via a prime mover and configured to generate an alternating current (AC) power. The hybrid power generation system further includes a first power converter electrically coupled to the generator, where the first power converter includes a direct current (DC) link. Furthermore, the hybrid power generation system includes a DC power source configured to be coupled to the DC-link. Moreover, the hybrid power generation system also includes a second power converter. Additionally, the hybrid power generation system includes an integration control sub-system operatively coupled to the first power converter and the DC power source. The integration control sub-system includes at least one bypass switch disposed between the DC power source and the DC-link and configured to connect the DC power source to the DC-link via the second power converter or bypass the second power converter.

Abstract: 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.

Abstract: A method of operating a power generation system (100) employing a generator (110) and a solar power source (120) is provided. The method includes the steps of determining (310) if a wind speed is less than a cut-in speed, calculating (315) a reactive power demand for an electrical grid (102), calculating (320) a reactive power capability of a line side converter (140), determining (325) if the reactive power demand is greater than the reactive power capability, and calculating (330) a reactive power capability of the line side converter (140) and a rotor side converter (130). The method also includes the steps of determining (335) if the reactive power demand is greater than the reactive power capability of the line side converter (140) and the rotor side converter (130), and reducing solar power generation or reconfiguring the line side converter (140) and/or the rotor side converter (130) to meet reactive power demand.

Abstract: A system of reactive power compensators for a wind farm includes a multi-winding transformer and a plurality of modular reactive power compensators (MVBs). The multi-winding transformer includes a primary winding and a plurality of secondary windings. The primary winding is configured to be coupled to a point of common coupling (POCC) for the wind farm. The plurality of MVBs are each coupled to a corresponding winding of the plurality of secondary windings.

Abstract: A system for controlling a hybrid power generation plant is provided. The system is programmed to receive current conditions at the plurality of power generating assets including a first asset type and a second asset type, determine a forecast for a period of time based at least in part on the current conditions, determine that a first asset of the first asset type of the plurality of power generating assets has an available uprate margin for production of a first amount of active power, determine that a second asset of the second asset type of the plurality of power generating assets has capacity to generate a second amount of reactive power, instruct the first asset to reduce production of reactive power by the second amount and increase production of active power by the first amount, and instruct the second asset to increase production of reactive power by the second amount.

Abstract: A power generation system (100, 200, 300, 400) is presented. The power generation system includes a prime mover (102), a doubly-fed induction generator (DFIG) (104) having a rotor winding (126) and a stator winding (122), a rotor-side converter (106), a line-side converter (108), and a secondary power source (110, 401) electrically coupled to a DC-link (128). Additionally, the power generation system includes a control sub-system (112, 212, 312) having a controller, and a plurality of switching elements (130, and 132 or 201). The controller is configured to selectively control switching of one or more switching elements (130, and 132 or 201) based on a value of an operating parameter corresponding to at least one of the prime mover, the DFIG, or the secondary power source to connect the rotor-side converter in parallel to the line-side converter to increase an electrical power production by the power generation system.