Abstract: A wind turbine park (242) connected to a transmission system (234). The wind turbine park includes a component (230) for determining a short circuit ratio and based thereon for determining a parameter adjustment recipe, and a controller (238) for controlling an output of the wind turbine park, the controller (238) executing a control algorithm using a determined parameter adjustment recipe, the determined parameter adjustment recipe responsive to the short circuit ratio and determined within the component (230) or within the controller (238).

Abstract: The present invention provides a polarizer removing device and a method of using it. The polarizer removing device comprises a supporting unit for supporting a panel, a clamping-removing unit for clamping a polarizer and removing the polarizer from the panel, and a pressurizing unit for exerting a pressure onto the panel during the removal of the polarizer. According to the polarizer removing device, a uniform force is exerted onto the polarizer during the removal thereof. As a result, it is above to prevent the polarizer from being broken, thereby to facilitate the operation, improve the production efficiency and save an adhesive tape.

Abstract: A method of controlling a wind power plant, the wind power plant having a plurality of wind turbines and being connected to a power grid is provided. The method includes (a) detecting a grid frequency instability, (b) selecting a subset of wind turbines, (c) modifying a power reference for each wind turbine in the selected subset of wind turbines to respond to the grid frequency instability, and (d) applying the modified power references to the corresponding wind turbines in the selected subset of wind turbines. A wind power plant controller, a wind power plant, a computer program, and a computer program product are also provided.

Abstract: The present invention relates to a system and method for monitoring lubricant of an engine. The system for monitoring lubricant of an engine comprises: a lubricant sensor, which measures lubricant quantity of the engine; a data acquisition unit, which collects the lubricant quantity of the engine from the lubricant sensor at a fixed time interval; and a message generation unit, which generates lubricant quantity monitoring messages according to the lubricant quantity of the engine collected by the data acquisition unit.

Abstract: The present invention relates to a method for detecting addition of engine lubricant, comprising: determining whether the difference value between the lubricant quantity at a first timing and that at a second timing is greater than a first threshold value; delaying a period and determining whether the difference value between the lubricant quantity at a third timing and that at a fourth timing is greater than a second threshold value in response to that the difference value between the lubricant quantity at the first timing and that at the second timing is greater than the first threshold value; and detecting the lubricant increment in response to that the difference value between the lubricant quantity at the third timing and that at the fourth timing is greater than the second threshold value.

Abstract: To contribute to the improvement of catalytic activity of a lower hydrocarbon aromatization catalyst, which converts a lower hydrocarbon(s) to an aromatic compound(s), and to the improvement of compactability of the catalyst. The lower hydrocarbon aromatization catalyst is obtained by compacting a mixture obtained by mixing a metallosilicate supporting thereon a catalyst metal and having a large grain size with a metallosilicate supporting thereon a catalyst metal and having a small grain size. As the metallosilicate having a large grain size, one having a grain size of from 1.0 ?m to 5.0 ?m is used. As the metallosilicate having a small grain size, one having a grain size of from 0.1 ?m to 1.0 ?m is used. The percentage of the metallosilicate having a large grain size is adjusted to from 20% to 80%, relative to mass of the lower hydrocarbon aromatization catalyst.

Abstract: A power generating device (2, 3) for supplying power to a power system (37). The power generating device includes a first component (87) for generating a first signal representing a frequency of a voltage on the power system, a power converter (90) for generating an output voltage, a second component (82) responsive to the first signal and to a second signal representing the output voltage, the second component producing an error signal representing a phase angle difference between the first and second signals, and the error signal being an input to the power converter for controlling the power converter to maintain the phase angle difference between the output voltage and the first signal.

Abstract: A wind turbine generator park (1) for supplying power to a power system (37), the park having an assigned first droop response characteristic for use in responding to an under-frequency occurrence on the power system (37). The park comprises a first comparator (108) for generating a first signal when the park is operating according to a curtailed condition, a second comparator (100) for indicating that a change in a frequency of a voltage or current on the power system (37) is greater than a first threshold value, and a controller (114) responsive to the first and second signals for controlling the park according to a second response characteristic causing the park (1) to supply an amount of power to the power system (37) greater than the power supplied according to the first droop response characteristic.

Abstract: When producing an aromatic hydrocarbon by a contact reaction of a lower hydrocarbon with a catalyst, the aromatic hydrocarbon is produced stably for a long time while maintaining a high aromatic hydrocarbon yield. In a process for producing an aromatic hydrocarbon by being equipped with a reaction step for obtaining the aromatic hydrocarbon by a contact reaction of a lower hydrocarbon with a catalyst and a regeneration step for regenerating the catalyst used in this reaction step, and by repeating the reaction step and the regeneration step, yield of the aromatic hydrocarbon is calculated at constant intervals of time. A yield as the standard is set up from this calculated yield. Based on the change of yield relative to this standard, the regeneration time of the regeneration step is prolonged. A threshold value is set up in the change of yield.

Abstract: A method and system for controlling the output power from a renewable energy installation (10) to a utility grid (56) having a predetermined bound for a variation in output power per unit of time is provided. The method and system includes constraining an output signal of a controller (76) to an upper and/or lower limit via a limiter (78), wherein the upper and/or lower limit comprises a predetermined upper and/or lower bound for a variation in output power per unit of time. The constrained output signal is then applied to the plurality of electricity generators (12, 14, 16) to limit the variation in output power per unit of time according to the predetermined bound.

Abstract: The present application discloses a method for detecting whether performance of an aircraft component is in a decline period, comprising: obtaining one or more detection parameters reflecting operation status of the aircraft component; comparing data of the one or more detection parameters with respective desired values; and determining whether the performance of the aircraft component is in the decline period based on a comparison result.

Abstract: To improve stability of catalytic performance, an aromatizing catalyst for converting lower hydrocarbons into aromatic compounds is regenerated. A regeneration process of the aromatizing catalyst according to the present invention includes the steps of: (a) reacting the aromatizing catalyst with a hydrogen gas in an atmosphere containing the hydrogen gas after using the aromatizing catalyst in an aromatizing reaction for converting lower hydrocarbons into aromatic compounds; (b) decreasing a temperature of the atmosphere containing the hydrogen gas reacted with the aromatizing catalyst, by supplying one of an inert gas and a reducing gas to the atmosphere; (c) reacting the aromatizing catalyst reacted with this inert gas, with an oxidizing gas; and (d) reacting the aromatizing catalyst reacted with the oxidizing gas, with a reducing gas.

Abstract: A wind turbine park (242) connected to a transmission system (234). The wind turbine park includes a component (230) for determining a short circuit ratio and based thereon for determining a parameter adjustment recipe, and a controller (238) for controlling an output of the wind turbine park, the controller (238) executing a control algorithm using a determined parameter adjustment recipe, the determined parameter adjustment recipe responsive to the short circuit ratio and determined within the component (230) or within the controller (238).

Abstract: The present application discloses a method for detecting whether performance of an aircraft component is in a decline period, comprising: obtaining one or more detection parameters reflecting operation status of the aircraft component; comparing data of the one or more detection parameters with respective desired values; and determining whether the performance of the aircraft component is in the decline period based on a comparison result.

Abstract: When producing an aromatic hydrocarbon by a contact reaction of a lower hydrocarbon with a catalyst, the aromatic hydrocarbon is produced stably for a long time while maintaining a high aromatic hydrocarbon yield. In a process for producing an aromatic hydrocarbon by being equipped with a reaction step for obtaining the aromatic hydrocarbon by a contact reaction of a lower hydrocarbon with a catalyst and a regeneration step for regenerating the catalyst used in this reaction step, and by repeating the reaction step and the regeneration step, yield of the aromatic hydrocarbon is calculated at constant intervals of time. A yield as the standard is set up from this calculated yield. Based on the change of yield relative to this standard, the regeneration time of the regeneration step is prolonged. A threshold value is set up in the change of yield.

Abstract: A wind turbine controlled to damp subsynchronous resonance oscillations on a grid is provided. The wind turbine includes rotor blades for turning by the wind, an electric generator rotatably coupled to the rotor blades, a power converter responsive to electricity generated by the electric generator, the power converter for converting the generated electricity to a frequency and voltage suitable for supply to the power grid, and the power converter for regulating voltage on the grid for damping the subsynchronous oscillations. Additionally, in one embodiment voltage regulation is supplemented by modulating real power to damp the subsynchronous oscillations.

Abstract: In manufacturing aromatic hydrocarbons by causing a contact reaction between a lower hydrocarbon and a catalyst, the aromatic hydrocarbons are stably produced over a long period of time while maintaining high aromatic hydrocarbon yields. The process includes a reaction process of initiating the contact reaction between the lower hydrocarbon and the catalyst thereby obtaining the aromatic hydrocarbons and hydrogen, and a regeneration process of regenerating the catalytic activity by bringing hydrogen into contact with the catalyst used in the reaction process. The reaction process and the regeneration process are repeated thereby producing the aromatic hydrocarbons and hydrogen. In the reaction process, carbon monoxide is added to the lower hydrocarbons and additionally a reaction temperature is set at higher than 800° C.

Abstract: The present application discloses a method for detecting performance of an APU, comprising: obtaining EGT (Exhaust Gas Temperature), LCIT (Load Compressor Inlet Temperature), STA (Starting Time), TSR and PT, comparing respectively a difference of EGT and LCIT (i.e., EGT-LCIT), STA, TSR and PT with respective threshold value; assigning a weights to comparison results between the EGT-LCIT, STA, TSR and PT and the respective threshold value; and determining the performance of the APU based on the comparison results considering the weight between the EGT-LCIT, STA, TSR and PT and the respective threshold value.

Abstract: A wind farm (10) may include a plurality of variable speed wind turbines (12, 14, 16). A centralized controller (50) may be configured to selectively adjust a respective electrical output power from each of the wind turbines at least during an underfrequency condition. The controller may include a monitor (52) configured to monitor a grid frequency value relative to at least a first threshold value. A deviation of the grid frequency value beyond the first threshold value is indicative of the underfrequency condition. The controller further includes a control unit (54) configured to effect a step response to the electrical output power of the wind turbine in a direction selected to counteract the underfrequency condition.

Abstract: [Object] To produce aromatic hydrocarbon stably for a long time maintaining a high aromatic hydrocarbon yield when the aromatic hydrocarbon is produced upon making a contact reaction between lower hydrocarbon and a catalyst. [Solving Means] In a method of producing aromatic hydrocarbon, including repeating a reaction step for obtaining aromatic hydrocarbon upon making a contact reaction between lower hydrocarbon and a catalyst and a regeneration step for regenerating the catalyst used in the reaction step, carbon dioxide in an amount of 0.33 to 1.6% by volume relative to an amount of the lower hydrocarbon is added to the lower hydrocarbon, in the reaction step.