Abstract: An operation control system for a wind farm having wind turbines includes: a remaining-lifetime estimation unit for estimating remaining lifetime of a component of each wind turbine; a sales-income estimation unit for estimating, for each wind turbine, an income from sales of electric power under a plurality of output control conditions; a maintenance-cost estimation unit for estimating, for each wind turbine, maintenance cost based on the remaining lifetime of the component under each of the plurality of power limit conditions; a power-limit-condition selection unit for selecting, for each wind turbine, a power limit condition that maximizes income obtained from the wind farm, based on the income from sales of electric power and the maintenance cost estimated for each wind turbine under each of the power limit conditions; and an operation command unit for sending an operation command to each wind turbine based on the selected power limit condition.

Abstract: An accumulator is provided in an oil circuit of the pressure supply device and has a gas chamber for storing the pressure generated by the oil pump. A gas pressure judgment unit judges a soundness on the gas pressure of the gas chamber of the accumulator. A pitch movement judgment unit judges whether the pitch movement is performed soundly by the oil pressure accumulated in the accumulator if the gas pressure judgment unit judges that the gas pressure is sound. A start judgment unit judges a start condition to start the gas pressure judgment unit every predetermined period or when a start switch is operated.

Abstract: A handy terminal for a wind turbine generator, includes a connecting portion connectable to a connector provided in the wind turbine generator, an operating ends group including an operating button to generate an operating signal which selectively validates a control logic within a control circuit provided in the wind turbine generator, and a display portion for displaying the operating state of the operating ends group. The operating ends group includes a mode selecting button for selectively validates one of a maintenance mode and an operating mode of the wind turbine generator; and a rotor turning button for switching to the blades pitch control state in which blades of the wind turbine generator side are driven in the predetermined low speed with adjusting the pitch angle of the blades according to the rotational speed.

Abstract: A handy terminal for a wind turbine generator which the maintenance of the wind turbine generator, especially the maintenance work inside the nacelle, can be simplified while considering the safety of the maintenance operator. The handy terminal comprises a tower provided to stand on land or off-shore, a nacelle supported on the tower to be controlled to rotate in the yaw direction and a plurality of rotatable blades attached to the nacelle to be controlled to move their pitch, whereby the handy terminal is connectable to connecting ends respectively provided on the lower portion of the tower and the nacelle so as to perform various control of the wind turbine generator.

Abstract: There is provided a wind turbine generator and a method of controlling the same which can prevent the decline in power generation efficiency even when the generator is located where the wind is not always strong. The wind turbine generator mainly includes an anemometer, an anemoscope, a nacelle swiveling mechanism which turns a nacelle, and a control unit which controls the nacelle swiveling mechanism. The control unit controls the nacelle swiveling mechanism so as to swivel the nacelle based on the wind direction obtained from the measurement result of the anemoscope when the wind speed obtained from the measurement result of the anemometer is greater than a first threshold Vth1 which is smaller than a cut-in wind speed Vcut—in, and controls the nacelle swiveling mechanism so as to stop the swiveling of the nacelle when the wind speed obtained from the measurement result of the anemometer is not greater than a first threshold Vth1.

Abstract: An accumulator is provided in an oil circuit of the pressure supply device and has a gas chamber for storing the pressure generated by the oil pump. A gas pressure judgment unit judges a soundness on the gas pressure of the gas chamber of the accumulator. A pitch movement judgment unit judges whether the pitch movement is performed soundly by the oil pressure accumulated in the accumulator if the gas pressure judgment unit judges that the gas pressure is sound. A start judgment unit judges a start condition to start the gas pressure judgment unit every predetermined period or when a start switch is operated.

Abstract: A handy terminal for a wind turbine generator that can prevent management of control logics of control devices for controlling operation of the wind turbine generator from becoming cumbersome. The handy terminal for the wind turbine generator comprises, a connecting portion that connects to a connecting end provided on the wind turbine generator, an operating ends group that generate operation signals to selectively enable control logics included in a control circuit that is incorporated in the wind turbine generator, and a display portion that displays the operating state of the operating ends, wherein the operation signals generated by the operating ends group are operation signals that selectively enables the operating or maintenance control logics of the control circuit of the corresponding wind turbine generator connected via the connecting portion, that are common to the other wind turbine generators in the same site.

Abstract: The present invention provides a maintenance operation method for a wind turbine generator and a wind turbine generator, which can effectively utilize a phase advance capacitor equipped in the wind turbine generator and contribute to the phase factor improvement of the system side.

Abstract: A thiophene compound having a phosphate group, for example, one represented by the formula [1]. The compound has high resistance to heat and oxidation and can be improved in solubility or dispersibility in various solvents. (In the formula, R1 and R2 each independently represents, e.g., hydrogen, halogeno, cyano, or phenyl optionally substituted by W; and R3 to R6 each independently represents —OR7, SR8, or —NR92, provided that R7 to R9 each independently represents hydrogen, C1-10 alkyl, or phenyl optionally substituted by W and W represents halogeno, cyano, nitro, hydroxyl, mercapto, amino, formyl, carboxy, C1-10 alkyl, etc.

Abstract: The present invention provides a wind turbine generator and a method of controlling the same which can prevent the decline in power generation efficiency even when the generator is located where the wind is not always strong. The wind turbine generator mainly includes an anemometer, an anemoscope, a nacelle swiveling mechanism which turns a nacelle, and a control unit which controls the nacelle swiveling mechanism. The control unit controls the nacelle swiveling mechanism so as to swivel the nacelle based on the wind direction obtained from the measurement result of the anemoscope when the wind speed obtained from the measurement result of the anemometer is greater than a first threshold Vth1 which is smaller than a cut-in wind speed Vcut—in, and controls the nacelle swiveling mechanism so as to stop the swiveling of the nacelle when the wind speed obtained from the measurement result of the anemometer is not greater than a first threshold Vth1.

Abstract: A handy terminal for a wind turbine generator which the maintenance of the wind turbine generator, especially the maintenance work inside the nacelle, can be simplified while considering the safety of the maintenance operator.

Abstract: The present invention provides a handy terminal for a wind turbine generator and a wind turbine generator being able to improve the safety and the work efficiency in a maintenance work such as greasing work with rotating a rotational shaft. A handy terminal for a wind turbine generator, comprises a connecting portion connectable to a connector provided in the wind turbine generator, an operating ends group including an operating button to generate an operating signal which selectively validates a control logic within a control circuit provided in the wind turbine generator, and a display portion for displaying the operating state of the operating ends group.

Abstract: The present invention provides a maintenance operation method for a wind turbine generator and a wind turbine generator, which can effectively utilize a phase advance capacitor equipped in the wind turbine generator and contribute to the phase factor improvement of the system side.

Abstract: A thiophene compound having a phosphate group, for example, one represented by the formula [1]. The compound has high resistance to heat and oxidation and can be improved in solubility or dispersibility in various solvents. (In the formula, R1 and R2 each independently represents, e.g., hydrogen, halogeno, cyano, or phenyl optionally substituted by W; and R3 to R6 each independently represents —OR7, SR8, or —NR92, provided that R7 to R9 each independently represents hydrogen, C1-10 alkyl, or phenyl optionally substituted by W and W represents halogeno, cyano, nitro, hydroxyl, mercapto, amino, formyl, carboxy, C1-10 alkyl, etc.

Abstract: The invention is to provide an asymmetric reaction catalyst useful for the production of medical or agricultural chemicals or intermediates thereof. The catalyst comprises an optically active monophosphino carboxylic acid derivative represented by the formula (I): ##STR1## where R.sup.1 represents a C.sub.1-6 alkyl group or phenyl group which may be optionally substituted with a C.sub.1-4 alkyl group or C.sub.1-4 alkoxy group,R.sup.2 represents a C.sub.1-4 alkyl group,R.sup.3 and R.sup.4 each represents independently a hydrogen atom, C.sub.1-4 alkyl group or phenyl group which may be optionally substituted with a C.sub.1-4 alkyl or C.sub.1-4 alkoxy group and a transition metal compound.

Abstract: Toner binder compositions for electrophotography, comprising a binder resin (A) and an organic material (B) dispersed therein with an average particle size of not more than 5 .mu.m at roan temperature; said material (B) being compatible with (A) between 80.degree..about.150.degree. C. and having a melting point of at most 120.degree. C., a melt viscosity not more than 10,000 cPs at 120.degree. C. and a molecular weight satisfying the inequality:4.0.ltoreq..DELTA.Sp+1.2log M.sub.B .ltoreq.7.0 (1)wherein log M.sub.B represents logarithm of the molecular weight (or Mw) of (B), and .DELTA. Sp represents the absolute value of the difference of Sp value of (A) and Sp value of (B), are of good thermal shelf stability and electrical properties, high hot offset-causing temperature and improved low temperature fixing properties.