Patent application number | Description | Published |
20100213712 | WIND TURBINE GENERATOR - 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. | 08-26-2010 |
20100250012 | WIND-POWER GENERATION SYSTEM AND OPERATION CONTROL METHOD THEREFOR - 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. | 09-30-2010 |
20110074152 | WIND TURBINE GENERATOR AND METHOD OF CONTROLLING THE SAME - In a case where a request for changing a maximum value of active power and a newly defined maximum value of active power are received from the utility grid side, a maximum value of an active power demand value set to a rated value is changed to the newly defined maximum value of active power at a predetermined change rate or less. | 03-31-2011 |
20110077787 | WIND TURBINE GENERATOR, METHOD OF CONTROLLING THE SAME, AND WIND TURBINE GENERATING SYSTEM - Damage is prevented on electric devices in a case where a generator is installed in a cold weather. A wind turbine generator includes a power supply unit connected to a utility grid via a switch gear; a utility grid voltage measuring unit provided between the power supply unit and the utility grid, for measuring a voltage of the utility grid; and a temperature measuring unit for obtaining an ambient temperature of the power supply unit. In a case where a measurement value of the temperature measuring unit or an ambient temperature of the power supply unit estimated based on the measurement value is smaller than a first temperature threshold determined based on a function guarantee temperature of the power supply unit and the voltage measured by the utility grid voltage measuring unit is smaller than a preset voltage threshold, the switch gear operates to interrupt the connection between the power supply unit and the utility grid. | 03-31-2011 |
20110112697 | WIND TURBINE GENERATOR SYSTEM AND OPERATION CONTROL METHOD THEREFOR - 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. | 05-12-2011 |
20110156388 | WIND TURBINE GENERATOR SYSTEM - It is an object to provide a wind turbine generator system that can promptly restore the system voltage in the event of, for example, a low voltage phenomenon. A controller | 06-30-2011 |
20110204630 | WIND POWER GENERATION SYSTEM AND OPERATION CONTROL METHOD THEREOF - 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. | 08-25-2011 |
20110291414 | WIND POWER GENERATION SYSTEM AND METHOD OF CONTROLLING THE SAME - 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. | 12-01-2011 |
20110320052 | UTILITY GRID STABILIZATION APPARATUS AND METHOD,AS WELL AS WIND POWER GENERATING SYSTEM - It is an object to supply stable reactive power without requiring large-scale civil engineering work. The invention provides a utility grid stabilization apparatus to be applied to a generating system including a generator having a squirrel-cage induction generator to generate electric power using natural energy and a connection switching section provided between the generator and a utility grid to switch between connection and disconnection of the generator and the utility grid to and from each other, the apparatus including a reactive power regulating section for supplying or absorbing reactive power to or from the utility grid when voltage of the utility grid satisfies a preset variation condition and the generator is disconnected from the utility grid. | 12-29-2011 |
20120286510 | WIND POWER GENERATION SYSTEM AND METHOD OF CONTROLLING THE SAME - 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. | 11-15-2012 |