Patents by Inventor Per Ranstad
Per Ranstad 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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Patent number: 9899831Abstract: A power supply converter unit is disclosed, in particular for an electrostatic precipitator, converting the frequency of alternating input supply (1) to high frequency alternating output (Ua, Ub) by rectifying the alternating input supply (1) in a rectifier (12) to a direct current (Udc), which is converted to alternating-current in a full bridge inverter (13) in a H-bridge circuit with switches (48) controlled by a control unit (23). According to the invention on the input side of the rectifier (12) and/or in the direct current (Udc) section there is provided at least one overvoltage protection circuitry (34, 35, 37-39, 45). Furthermore the invention discloses a method of operation of such a power supply converter unit as well as uses of such a power supply converter unit.Type: GrantFiled: September 30, 2011Date of Patent: February 20, 2018Assignee: General Electric Technology GmbHInventors: Per Ranstad, Jörgen Linner
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Patent number: 9543855Abstract: A Voltage Source Converter (VSC) (10) with Neutral-Point-Clamped (NPC) topology with one or more phases, comprises an intermediate DC circuit having at least a first and a second capacitance connected in series between a positive terminal and a negative terminal, providing a central tap terminal between both capacitances, and at least one sub-circuit for generating one phase of an alternating voltage, each sub-circuit comprising an AC terminal for supplying a pulsed voltage; a circuit arrangement of the form of a conventional NPC converter, with a first series connection of at least two switches between said AC terminal and said positive terminal, a second series connection of at least two switches between said AC terminal said negative terminal, and switchable connections from said central tap terminal to the centers of both two-switch series connections; and additional first and second auxiliary switches assigned to said two-switch series connections.Type: GrantFiled: November 5, 2012Date of Patent: January 10, 2017Assignee: General Electric Technology GmbHInventors: Thiago Batista Soeiro, Johann Walter Kolar, Per Ranstad, Jörgen Linner
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Patent number: 9331561Abstract: Disclosed is a method for the improvement of the line quality in a system, in which a common feeding (1), via at least one distribution transformer (3), feeds at least two non-linear loads (11) drawing non-sinusoidal currents from the common feeding (1), wherein between the common feeding (1) and the distribution transformer (3) there is at least one primary side transformer line (2) and between the at least one distribution transformer (3) and the loads (11) there is at least one lower voltage secondary side transformer line (22), wherein at least one active filter (24) attached to at least one lower voltage secondary side transformer line (22) is used for the attenuation or elimination of higher order harmonics experienced by the common feeding (1). Furthermore a high power distribution system for use of such a method is disclosed, in particular for the operation of an electrostatic precipitator.Type: GrantFiled: June 1, 2011Date of Patent: May 3, 2016Assignee: ALSTOM Technology LtdInventors: Johann Walter Kolar, Thiago Batista Soeiro, Jürgen Biela, Per Ranstad, Jörgen Linner
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Patent number: 9325300Abstract: The disclosure relates to a method for the scheduling and/or the operation of a system of at least two power supplies (11) providing DC pulses to a consumer (5), typically an electrostatic precipitator, wherein the power supplies (11) are energized by a common feeding (1). According to the proposed method one power supply (11) is defined to be the reference power supply, and the initial pulses of each further power supply (11) are shifted by controlled delays (?Pri) with respect to the pulses of the reference power supply so as to fill the gaps between the pulses of the reference power supply by the pulses of the further power supplies (11).Type: GrantFiled: June 17, 2011Date of Patent: April 26, 2016Assignee: ALSTOM Technology LtdInventors: Per Ranstad, Jörgen Linner, Jürgen Biela, Thiago Batista Soeiro
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Patent number: 9132434Abstract: The disclosure relates to an electrostatic precipitator unit with at least two individual power supplies (11) for pulsed operation of electrostatic static precipitators, wherein the power supplies (11) are powered by a common feeding (1), wherein each power supply (11) comprises a control unit (23), and wherein the control units are at least indirectly connected by communication lines (32) allowing for a controlled relative scheduling of the pulsed operation of the individual power supplies (11).Type: GrantFiled: June 17, 2011Date of Patent: September 15, 2015Assignee: ALSTOM Technology LtdInventors: Per Ranstad, Jörgen Linner
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Publication number: 20130321959Abstract: A power supply converter unit is disclosed, in particular for an electrostatic precipitator, converting the frequency of alternating input supply (1) to high frequency alternating output (Ua, Ub) by rectifying the alternating input supply (1) in a rectifier (12) to a direct current (Udc), which is converted to alternating-current in a full bridge inverter (13) in a H-bridge circuit with switches (48) controlled by a control unit (23). According to the invention on the input side of the rectifier (12) and/or in the direct current (Udc) section there is provided at least one overvoltage protection circuitry (34, 35, 37-39, 45). Furthermore the invention discloses a method of operation of such a power supply converter unit as well as uses of such a power supply converter unit.Type: ApplicationFiled: September 30, 2011Publication date: December 5, 2013Applicant: ALSTOM TECHNOLOGY, LTDInventors: Per Ranstad, Jörgen Linner
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Patent number: 8570776Abstract: A method is provided for determining a control scheme for a voltage source converter (VSC) with a topology of three bridge legs between each of three phases of a grid and a neutral point. The method includes: analyzing the waveform of the grid and/or a load voltage and determining an allowed period for no-swilching of the corresponding bridge leg; operating the VSC with different clamping carrier modulator frequencies, and then analyzing the balance in the operating junction temperatures and/or power losses across the active switches and also analyzing the total losses of the VSC; comparing the balance and the total losses of different clamping carrier modulator frequencies and selecting the clamping carrier modulator frequency; operating the VSC with the selected clamping carrier modulator frequency, and optimizing the balance in the operating junction temperatures and/or power losses across the active switches and the total losses of the VSC.Type: GrantFiled: May 27, 2011Date of Patent: October 29, 2013Assignee: ALSTOM Technology LtdInventors: Johann W. Kolar, Thiago Soeiro, Per Ranstad, Jörgen Linner
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Publication number: 20130272045Abstract: A Voltage Source Converter (VSC) (10) with Neutral-Point-Clamped (NPC) topology with one or more phases, comprises an intermediate DC circuit having at least a first and a second capacitance connected in series between a positive terminal and a negative terminal, providing a central tap terminal between both capacitances, and at least one sub-circuit for generating one phase of an alternating voltage, each sub-circuit comprising an AC terminal for supplying a pulsed voltage; a circuit arrangement of the form of a conventional NPC converter, with a first series connection of at least two switches between said AC terminal and said positive terminal, a second series connection of at least two switches between said AC terminal said negative terminal, and switchable connections from said central tap terminal to the centers of both two-switch series connections; and additional first and second auxiliary switches assigned to said two-switch series connections.Type: ApplicationFiled: November 5, 2012Publication date: October 17, 2013Inventors: Thiago Batista Soeiro, Johann Walter Kolar, Per Ranstad, Jörgen Linner
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Publication number: 20130206001Abstract: The disclosure relates to an electrostatic precipitator unit with at least two individual power supplies (11) for pulsed operation of electrostatic precipitators, wherein the power supplies (11) are powered by a common feeding (1), wherein each power supply (11) comprises a control unit (23), and wherein the control units are at least indirectly connected by communication lines (32) allowing for a controlled relative scheduling of the pulsed operation of the individual power supplies (11).Type: ApplicationFiled: June 17, 2011Publication date: August 15, 2013Applicant: ALSTOM TECHNOLOGY LTDInventors: Per Ranstad, Jörgen Linner
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Publication number: 20130201727Abstract: Disclosed is a method for the improvement of the line quality in a system, in which a common feeding (1), via at least one distribution transformer (3), feeds at least two non-linear loads (11) drawing non-sinusoidal currents from the common feeding (1), wherein between the common feeding (1) and the distribution transformer (3) there is at least one primary side transformer line (2) and between the at least one distribution transformer (3) and the loads (11) there is at least one lower voltage secondary side transformer line (22), wherein at least one active filter (24) attached to at least one lower voltage secondary side transformer line (22) is used for the attenuation or elimination of higher order harmonics experienced by the common feeding (1). Furthermore a high power distribution system for use of such a method is disclosed, in particular for the operation of an electrostatic precipitator.Type: ApplicationFiled: June 1, 2011Publication date: August 8, 2013Applicant: ALSTOM TECHNOLOGY LTDInventors: Johann Walter Kolar, Thiago Batista Soeiro, Jürgen Biela, Per Ranstad, Jörgen Linner
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Publication number: 20130194015Abstract: The disclosure relates to a method for the scheduling and/or the operation of a system of at least two power supplies (11) providing DC pulses to a consumer (5), typically an electrostatic precipitator, wherein the power supplies (11) are energised by a common feeding (1). According to the proposed method one power supply (11) is defined to be the reference power supply, and the initial pulses of each further power supply (11) are shifted by controlled delays (?Pri) with respect to the pulses of the reference power supply so as to fill the gaps between the pulses of the reference power supply by the pulses of the further power supplies (11).Type: ApplicationFiled: June 17, 2011Publication date: August 1, 2013Applicant: ALSTOM TECHNOLOGY LTDInventors: Per Ranstad, Jögen Linner, Jürgen Biela, Thiago Batista Soeiro
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Publication number: 20120300514Abstract: A method is provided for determining a control scheme for a neutral point clamped (NPC) voltage source converter (VSC) with at least 3 levels and a topology of three bridge legs between each of three phases of a grid and a neutral point. Each leg includes at least four active switches, and a clamping carrier modulator synchronized with the grid is provided for the control of no-switching intervals.Type: ApplicationFiled: May 27, 2011Publication date: November 29, 2012Applicant: ALSTOM Technology LtdInventors: Johann W. KOLAR, Thiago SOEIRO, Per RANSTAD, Jörgen LINNER
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Patent number: 5639294Abstract: Method for controlling, in case of flashover between electrodes in an electrostatic precipitator, the current supply to the electrodes from a controllable high-voltage direct-current source. The current supplied to the precipitator and the voltage between the electrodes of the precipitator are measured substantially continuously or at close intervals. After the flashover, the current supply to the electrodes of the precipitator is completely interrupted during a first time interval. During a second time interval directly following the first time interval, a current which is greater that the one supplied immediately before the flashover is supplied to the precipitator. Subsequently, the current is reduced to a value below the one prevailing immediately before the flashover.Type: GrantFiled: September 19, 1995Date of Patent: June 17, 1997Assignee: ABB Flakt ABInventor: Per Ranstad