Abstract: Provided is an overvoltage protection device for protecting a wind turbine against overvoltage. The device includes a double fed induction generator (DFIG) including a rotor connection including a plurality of electrical connections coupled to rotor leads of the DFIG and a stator connection including a plurality of electrical connections coupled to stator leads of the DFIG. Also included is a self-triggering circuit coupled with the rotor connection and operative in response to changes in a utility grid voltage during a grid fault when an overvoltage event is detected such that the overvoltage protection circuit automatically operates, independently of a controller or a sensor, to reduce the detected overvoltage to a predetermined voltage level.

Abstract: The invention discloses a three-DOF hybrid damping pantograph, comprising an electric driving transmission system fixed on a base, and collector heads, transverse dampers, parallel support frames as well as longitudinal dampers. Square auxiliary holes are arranged on the base, supporting insulators are arranged on four angles below the base; four transverse dampers are symmetrically fixed on the base, and arranged on the outside of the parallel support frames and connected with the parallel support frames through hinges; four longitudinal dampers are symmetrically fixed on the top of the parallel support frames; the collector heads are connected with the parallel support frames by the longitudinal dampers and separators are arranged on the collector heads. The invention can realize bearing and damping spatially in three directions, avoid pantograph detachment, catenary scraping and other safety accidents, and improve the structural stability of the pantograph and adaptability to the catenary.

Abstract: The invention discloses a three-DOF hybrid damping pantograph, comprising an electric driving transmission system fixed on a base, and collector heads, transverse dampers, parallel support frames as well as longitudinal dampers. Square auxiliary holes are arranged on the base, supporting insulators are arranged on four angles below the base; four transverse dampers are symmetrically fixed on the base, and arranged on the outside of the parallel support frames and connected with the parallel support frames through hinges; four longitudinal dampers are symmetrically fixed on the top of the parallel support frames; the collector heads are connected with the parallel support frames by the longitudinal dampers and separators are arranged on the collector heads. The invention can realize bearing and damping spatially in three directions, avoid pantograph detachment, catenary scraping and other safety accidents, and improve the structural stability of the pantograph and adaptability to the catenary.

Abstract: A device includes a controller configured to regulate one or more voltages applied to a gate of an insulated gate bipolar transistor (IGBT). The controller is configured to receive one or more voltage values associated with the IGBT, and generate a gating signal and transmit the gating signal to the IGBT. The gating signal is configured to activate or deactivate the IGBT. The controller is configured to generate a voltage clamping signal and transmit the voltage clamping signal to activate or deactivate an active switching device. The active switching device is configured to periodically limit the one or more voltage values associated with the IGBT based at least in part on one or more characteristics of the voltage clamping signal.

Abstract: A device includes a controller configured to regulate one or more voltages applied to a gate of an insulated gate bipolar transistor (IGBT). The controller is configured to receive one or more voltage values associated with the IGBT, and generate a gating signal and transmit the gating signal to the IGBT. The gating signal is configured to activate or deactivate the IGBT. The controller is configured to generate a voltage clamping signal and transmit the voltage clamping signal to activate or deactivate an active switching device. The active switching device is configured to periodically limit the one or more voltage values associated with the IGBT based at least in part on one or more characteristics of the voltage clamping signal.

Abstract: In one embodiment the present invention includes an apparatus having a random access memory, a first interface, and a second interface. The first interface is coupled between the random access memory and a plurality of storage devices, and operates in a first in first out (FIFO) manner. The second interface is coupled between the random access memory and a processor, and operates in a random access manner. As a result, the processor is not required to be in the loop when data is being transferred between the random access memory and the storage devices.

Abstract: In one embodiment the present invention includes an apparatus having a random access memory, a first interface, and a second interface. The first interface is coupled between the random access memory and a plurality of storage devices, and operates in a first in first out (FIFO) manner. The second interface is coupled between the random access memory and a processor, and operates in a random access manner. As a result, the processor is not required to be in the loop when data is being transferred between the random access memory and the storage devices.