Patents by Inventor Shinji Arinaga
Shinji Arinaga has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Wind turbine generator, method of wind turbine generation, and program of the wind turbine generator
Patent number: 9279410Abstract: When a low voltage event occurs in a utility grid, a load on a spindle system is repressed so that a damage is prevented. A rotor having a plurality of wind turbine blades, a generator to be driven by rotation of the rotor, and a pitch angle controller for controlling a pitch angle of the wind turbine blade according to a generator speed are provided, and when a voltage of a utility grid is a predetermined value or less, the pitch angle controller controls the pitch angle so that torsional vibration generated on a spindle system for transmitting the rotation of the rotor to a generator system is repressed.Type: GrantFiled: October 3, 2012Date of Patent: March 8, 2016Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Shinji Arinaga, Akira Yasugi, Takatoshi Matsushita -
Patent number: 9024459Abstract: A rotor having a plurality of wind turbine blades, a generator to be driven by rotation of the rotor, a pitch angle controller for controlling a pitch angle of the wind turbine blades according to a speed of a generator, and a comparing and selecting section are provided. When the voltage of the utility grid is a predetermined value or less, the pitch angle controller controls the pitch angle so that the wind turbine blades do not move to a fine side. Further, the comparing and selecting section compares a temporary pitch angle command value determined based on the speed of the generator with a previous value of a pitch angle command value, and when the temporary pitch angle command value is a command for controlling the wind turbine blades closer to the fine side than the previous value, outputs the previous value as a current pitch angle command value.Type: GrantFiled: October 3, 2012Date of Patent: May 5, 2015Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shinji Arinaga, Akira Yasugi, Takatoshi Matsushita
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WIND TURBINE GENERATOR, METHOD OF WIND TURBINE GENERATION, AND PROGRAM OF THE WIND TURBINE GENERATOR
Publication number: 20140284927Abstract: When a low voltage event occurs in a utility grid, a load on a spindle system is repressed so that a damage is prevented. A rotor having a plurality of wind turbine blades, a generator to be driven by rotation of the rotor, and a pitch angle controller for controlling a pitch angle of the wind turbine blade according to a generator speed are provided, and when a voltage of a utility grid is a predetermined value or less, the pitch angle controller controls the pitch angle so that torsional vibration generated on a spindle system for transmitting the rotation of the rotor to a generator system is repressed.Type: ApplicationFiled: October 3, 2012Publication date: September 25, 2014Applicant: Mitsubishi Heavy Industries, Ltd.Inventors: Shinji Arinaga, Akira Yasugi, Takatoshi Matsushita -
Publication number: 20140217731Abstract: A rotor having a plurality of wind turbine blades, a generator to be driven by rotation of the rotor, a pitch angle controller for controlling a pitch angle of the wind turbine blades according to a speed of a generator, and a comparing and selecting section are provided. When the voltage of the utility grid is a predetermined value or less, the pitch angle controller controls the pitch angle so that the wind turbine blades do not move to a fine side. Further, the comparing and selecting section compares a temporary pitch angle command value determined based on the speed of the generator with a previous value of a pitch angle command value, and when the temporary pitch angle command value is a command for controlling the wind turbine blades closer to the fine side than the previous value, outputs the previous value as a current pitch angle command value.Type: ApplicationFiled: October 3, 2012Publication date: August 7, 2014Inventors: Shinji Arinaga, Akira Yasugi, Takatoshi Matsushita
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Patent number: 8796872Abstract: 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.Type: GrantFiled: February 20, 2009Date of Patent: August 5, 2014Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shinji Arinaga, Tsuyoshi Wakasa, Takatoshi Matsushita, Masaaki Shibata
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Patent number: 8749089Abstract: A wind power generation system is disclosed for suppressing 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 wind power generation system includes a blade control unit for controlling the pitch angle of the wind turbine blades such that the pitch angle matches a target pitch angle determined on the basis of at least 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.Type: GrantFiled: July 23, 2012Date of Patent: June 10, 2014Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shinji Arinaga, Tsuyoshi Wakasa, Takatoshi Matsushita, Akira Yasugi, Masaaki Shibata
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Patent number: 8676392Abstract: 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.Type: GrantFiled: December 10, 2012Date of Patent: March 18, 2014Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shinji Arinaga, Takatoshi Matsushita, Tsuyoshi Wakasa, Akira Yasugi, Masaaki Shibata
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Patent number: 8527104Abstract: 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.Type: GrantFiled: December 14, 2007Date of Patent: September 3, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shinji Arinaga, Takatoshi Matsushita, Tsuyoshi Wakasa, Masaaki Shibata, Akira Yasugi
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Patent number: 8517681Abstract: 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.Type: GrantFiled: February 15, 2011Date of Patent: August 27, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Takehiro Naka, Takatoshi Matsushita, Nobuyasu Nakamura, Yoshihiko Hayashi, Shinji Arinaga
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Publication number: 20130193934Abstract: It is an object to stabilize a utility grid even when an unexpected fluctuation in the frequency of the utility grid occurs. A wind turbine generator includes a rotor that rotates by wind power, a generator that is driven by rotation of the rotor, and a control device that controls a power output of the generator to increase while a rotational speed of the generator decreases when a frequency of a utility grid becomes smaller than or equal to a predetermined rated frequency and when the rotational speed of the generator is greater than or equal to a first predetermined value. In this way, even when the frequency of the utility grid fluctuates, the frequency fluctuation can be suppressed, and the utility grid can be stabilized.Type: ApplicationFiled: February 15, 2013Publication date: August 1, 2013Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Shinji ARINAGA, Tsuyoshi WAKASA, Takatoshi MATSUSHITA
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Patent number: 8428878Abstract: A lightning strike simulation apparatus includes a storage device for storing lightning strike data, a setting unit for setting a simulation target 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.Type: GrantFiled: July 16, 2008Date of Patent: April 23, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Takehiro Naka, Tsuyoshi Wakasa, Shinji Arinaga
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Publication number: 20130093186Abstract: 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.Type: ApplicationFiled: December 10, 2012Publication date: April 18, 2013Inventors: Shinji ARINAGA, Takatoshi MATSUSHITA, Tsuyoshi WAKASA, Masaaki SHIBATA, Akira YASUGI
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Patent number: 8405239Abstract: 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.Type: GrantFiled: June 18, 2008Date of Patent: March 26, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Masayuki Hashimoto, Tsuyoshi Wakasa, Takatoshi Matsushita, Shinji Arinaga
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Patent number: 8378643Abstract: It is an object to stabilize a utility grid even when an unexpected fluctuation in the frequency of the utility grid occurs. A wind turbine generator includes a rotor that rotates by wind power, a generator that is driven by rotation of the rotor, and a control device that controls a power output of the generator to increase while a rotational speed of the generator decreases when a frequency of a utility grid becomes smaller than or equal to a predetermined rated frequency and when the rotational speed of the generator is greater than or equal to a first predetermined value. In this way, even when the frequency of the utility grid fluctuates, the frequency fluctuation can be suppressed, and the utility grid can be stabilized.Type: GrantFiled: July 29, 2010Date of Patent: February 19, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shinji Arinaga, Tsuyoshi Wakasa, Takatoshi Matsushita
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Patent number: 8364323Abstract: A method of controlling an operation of a wind power generation system provided with a plurality of wind turbines, in which output power of each wind turbine is supplied to an electric power system through a common interconnection node where output data of each wind turbine is obtained, where a periodic correlation between output fluctuations of adjacent wind turbines is determined by using the output data, the correlation is determined as a strong correlation when the correlation is more than two times greater than an average level of the correlation, and a phase of the output of either one of the adjacent wind turbines is shifted by a period of the strong correlation.Type: GrantFiled: December 14, 2007Date of Patent: January 29, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shinji Arinaga, Takatoshi Matsushita, Tsuyoshi Wakasa, Masaaki Shibata, Akira Yasugi
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Patent number: 8360715Abstract: A wind turbine generator capable of enhancing starting performance of the wind turbine generator when the outside air temperature is low and capable of securing temperature adjusting ability of a generator set in a wide outside air temperature range is provided. A wind turbine generator includes a nacelle (3) for accommodating a generator set (11, 12, 14) that generates electricity by rotation of a rotor having a plurality of blades, a ventilation opening (51) provided in a wall surface on a wind upstream side when the nacelle is normally operated, and a heat exchanging unit (13) disposed in the ventilation opening (51) to exchange heat between an outside air and a lubricant of the generator set (11, 12) such as an lubricant oil or cooling water.Type: GrantFiled: July 9, 2009Date of Patent: January 29, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Takeshi Matsuo, Shinji Arinaga, Shinsuke Sato, Takatoshi Matsushita, Masaaki Shibata
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Patent number: 8355829Abstract: 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.Type: GrantFiled: December 14, 2007Date of Patent: January 15, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shinji Arinaga, Takatoshi Matsushita, Tsuyoshi Wakasa, Masaaki Shibata, Akira Yasugi
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Publication number: 20120286510Abstract: 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.Type: ApplicationFiled: July 23, 2012Publication date: November 15, 2012Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Shinji ARINAGA, Tsuyoshi WAKASA, Takatoshi MATSUSHITA, Akira YASUGI, Masaaki SHIBATA
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Patent number: 8269363Abstract: 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.Type: GrantFiled: May 5, 2010Date of Patent: September 18, 2012Assignee: Mitsubishi Heavy Industries, Ltd.Inventor: Shinji Arinaga
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Patent number: 8242619Abstract: 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.Type: GrantFiled: February 20, 2009Date of Patent: August 14, 2012Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shinji Arinaga, Tsuyoshi Wakasa, Takatoshi Matsushita, Akira Yasugi, Masaaki Shibata