Abstract: An object is to improve the operating rate. A first switch is provided in a power line connecting a power generator to a power system, and a second switch that can be opened and closed by remote control is provided in the power line between the power generator and the first switch. In the second switch, a withstand current capability is set that allows current flowing in a low-voltage event and that withstands current having a value equal to or less than a current value specified by the thermal setting of the power generator. In the first switch, a withstand current capability is set that is superior to the withstand current capability of the second switch and that withstands current having a value equal to or less than the current value specified by the thermal setting of the power generator.

Abstract: The present invention proposes a lightning protection device of a windmill blade, comprising a tip receptor assembly having receptors which are mounted, in particular to, the tip end part of the blade where the blade profile becomes smaller, and having a simple structure so as to be readily assembled, and an intermediate receptor assembly having a receptor which is set at the outer surface of the blade so as to exhibit an effective countermeasure against increasing of the air pressure in the blade upon a lightning striking upon the blade, a lightening current being discharged to the ground from the receptors through connection equipment such as lead wires laid through the inside of the blade the windmill body and bypass brushes, characterized in that a base plate made of an electrically conductive material and connected thereto with the lead wires is embedded in the blade, and the receptors are secured and supported to the base plate, being exposed at the outer surface of the blade.

Abstract: A wind turbine generator capable of preventing a salt damage and reducing noise as well as easily starting in a cold region is provided. The wind turbine generator includes a nacelle (3) for accommodating a generator set, an internal heat exchanging unit (13, 15, 16) accommodated in the nacelle (3) to exchange heat between the generator set and a refrigerant, an external heat exchanging unit (17) disposed outside the nacelle (3) to exchange heat between an outside air and the refrigerant, a compressor (18) disposed in the nacelle (3) to compress the refrigerant and circulate the refrigerant between the internal heat exchanging unit (13, 15, 16) and the external heat exchanging unit (17), and an expansion unit (19) to expand the refrigerant compressed by the compressor (18).

Abstract: Provided is a wind power generation system intending to suppress an increase of torque when a voltage in a utility grid is restored, and to reduce a load to devices due to the torque. The blade control unit controls the pitch angle of the wind turbine blades such that a rotation speed of the power generator becomes equal to or greater than a synchronous rotation speed when the power control unit de-actuates the operations of the converter and the inverter, and controls the pitch angle of the wind turbine blades such that the pitch angle matches a target pitch angle that is determined based on one of a wind speed, a rotation speed of the power generator, and a requested output power when the power control unit re-actuates the operations of the converter and the inverter.

Abstract: This invention improves accuracy of lightning strike simulation. There is provided a lightning strike simulation apparatus including a storage device for storing lightning strike data, a setting unit for setting a simulation target and the like in a simulation space, a downward leader advancing unit for advancing a downward leader from a lightning strike start position set by the setting unit, an upward leader advancing unit for advancing upward leaders from lightning strike-receiving candidate points set in the simulation space when a distance between a leading edge of the downward leader and a reference point is within a first threshold value, and a lightning strike point determination unit for, when a distance between a leading edge of the downward leader and a leading edge of any one of the upward leaders is within a second threshold value, determining that the lightning strike-receiving candidate point corresponding to the any one of the upward leaders is a lightning strike point.

Abstract: The object is to reduce an output fluctuation in an interconnection node. Provided is an operation control method of a wind power generation system including a step of obtaining the output data of each wind turbine, a step of determining a correlation between output fluctuations of adjacent wind turbines by using output data, and a step of shifting, if a strong correlation is exhibited, a phase of output fluctuation of either one of the adjacent wind turbines by a period at which the strong correlation is exhibited.

Abstract: An object is to provide a wind turbine generator that is capable of continuously operating an auxiliary unit even when a grid fault occurs. Provided is a wind turbine generator including an auxiliary-unit breaker provided in a power line that connects an auxiliary unit to a power grid, wherein the auxiliary-unit breaker has a current-resisting capacity within a range that tolerates a current that flows in a low-voltage event and does not exceed a tolerable current of a motor provided in the auxiliary unit.

Abstract: A wind turbine blade has a blade body 11, a plurality of receptors 12, 13 embedded in and exposed to the surface of the blade body 11, a conductor layer 14 provided on the surface of the blade body 11 and connecting the receptors 12, 13 with one another and a downconductor 21 connected to the receptors 12, 13 and provided in the blade body 11. The downconductor 21 may be embedded in an insulator.

Abstract: A wind turbine generator system includes: a wind turbine rotor including a blade having a variable pitch angle; a generator driven by the wind turbine rotor; and a control unit controlling the output power of the generator and the pitch angle of the blade in response to the rotational speed of the wind turbine rotor or the generator.

Abstract: A wind turbine generator capable of preventing a salt damage and reducing noise as well as easily starting in a cold region is provided. The wind turbine generator includes a nacelle (3) for accommodating a generator set, an internal heat exchanging unit (13, 15, 16) accommodated in the nacelle (3) to exchange heat between the generator set and a refrigerant, an external heat exchanging unit (17) disposed outside the nacelle (3) to exchange heat between an outside air and the refrigerant, a compressor (18) disposed in the nacelle (3) to compress the refrigerant and circulate the refrigerant between the internal heat exchanging unit (13, 15, 16) and the external heat exchanging unit (17), and an expansion unit (19) to expand the refrigerant compressed by the compressor (18).

Abstract: An object is to improve the accuracy of reactive power adjustment. Reactive-power command values corresponding to individual wind turbines are determined by correcting a predetermined reactive-power command value for an interconnection node A using reactive power correction levels set for the individual wind turbines.

Abstract: A wind turbine generator system includes: a wind turbine rotor including a blade having a variable pitch angle; a generator driven by the wind turbine rotor; and a control unit controlling the output power of the generator and the pitch angle of the blade in response to the rotational speed of the wind turbine rotor or the generator.

Abstract: [Problem] It is an object to stabilize a utility grid even when an unexpected fluctuation in the frequency of the utility grid occurs. [Solution] A wind turbine generator 1 includes a rotor 7 that rotates by wind power, a generator 5 that is driven by rotation of the rotor 7, and a control device 20 that controls a power output of the generator 5 to increase while a rotational speed of the generator 5 decreases when a frequency of a utility grid 13 becomes smaller than or equal to a predetermined rated frequency and when the rotational speed of the generator 5 is greater than or equal to a first predetermined value. In this way, even when the frequency of the utility grid 13 fluctuates, the frequency fluctuation can be suppressed, and the utility grid 13 can be stabilized.

Abstract: A wind power generator system includes a windmill rotor including a blade whose pitch angle is variable; a generator driven by the windmill rotor; and a control unit controlling output power of the generator and the pitch angle of the blade. The control unit performs a first control in which the output power is controlled in accordance with a predetermined power-rotational speed curve until the rotational speed is increased to reach a predetermined rated rotational speed, and a second control in which the output power is controlled to a predetermined rated power when the rotational speed exceeds the rated rotational speed. The control unit is responsive to the pitch angle for maintaining the second control or for switching to the first control, when the rotational speed is reduced below the rated rotational speed after the control unit is once placed into the state of performing the second control.

Abstract: It is an object to enable stable operation of a wind turbine and to change a control parameter of the wind turbine at an appropriate timing. A dynamic-characteristics model of a wind turbine is identified for each of a plurality of ranges that are determined in accordance with wind speed, and the identified dynamic-characteristics model is monitored for each of the ranges.

Abstract: An object is to improve the accuracy of power factor adjustment. Power-factor command values corresponding to individual wind turbines are determined by correcting a predetermined power-factor command value for an interconnection node using power factor correction levels set for the individual wind turbines.

Abstract: Provided is a power generator, including a plurality of wind power generators generating electrical power using wind power energy, and variable-speed wind power generators (20a, 20b) connected between the power generator and an electrical power system. The variable-speed wind power generators (20a, 20b) equalize an output of the entire power generating system by outputting power for correcting for a drop in output of the power generator.

Abstract: A wind power generator system includes a windmill rotor including a blade whose pitch angle is variable; a generator driven by the windmill rotor; and a control unit controlling output power of the generator and the pitch angle of the blade. The control unit performs a first control in which the output power is controlled in accordance with a predetermined power-rotational speed curve until the rotational speed is increased to reach a predetermined rated rotational speed, and a second control in which the output power is controlled to a predetermined rated power when the rotational speed exceeds the rated rotational speed. The control unit is responsive to the pitch angle for maintaining the second control or for switching to the first control, when the rotational speed is reduced below the rated rotational speed after the control unit is once placed into the state of performing the second control.

Abstract: Provided is a power generator, including a plurality of wind power generators generating electrical power using wind power energy, and variable-speed wind power generators connected between the power generator and an electrical power system. The variable-speed wind power generators equalize an output of the entire power generating system by outputting power for correcting for a drop in output of the power generator.

Abstract: An object is to improve the operating rate. A first switch is provided in a power line connecting a power generator to a power system, and a second switch that can be opened and closed by remote control is provided in the power line between the power generator and the first switch. In the second switch, a withstand current capability is set that allows current flowing in a low-voltage event and that withstands current having a value equal to or less than a current value specified by the thermal setting of the power generator. In the first switch, a withstand current capability is set that is superior to the withstand current capability of the second switch and that withstands current having a value equal to or less than the current value specified by the thermal setting of the power generator.