Patents by Inventor Manish Pande
Manish Pande 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: 9240733Abstract: Current source converters and control methods are presented for high dynamic performance by implementing a DC link current control loop parallel to one or more motor control loops, with a DC link current control command value for operating the current source rectifier being derived at least partially independent of the motor control command values, wherein certain implementations drive the current source rectifier to its maximum rated value, or the DC current command value can be set above an amount required by the current source inverter using a gain factor which can be fixed or can itself be adjusted based on one or more motor control error values for balancing as-needed dynamic performance and efficiency.Type: GrantFiled: October 1, 2013Date of Patent: January 19, 2016Assignee: Rockwell Automation Technologies, Inc.Inventors: Semyon Royak, Manish Pande, Jingya Dai, Sang Woo Nam, Ehshan Al-Nabi
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Patent number: 9054589Abstract: Power converters and control techniques are presented in which capacitor degradation is detected according to negative sequence current by computing an uncompensated negative sequence current and a negative sequence voltage, compensating the negative sequence current based on the negative sequence voltage, comparing the compensated or uncompensated negative sequence current with an automatically calculated threshold and selectively identifying suspected degradation of one or more capacitors if the compensated negative sequence current exceeds the threshold value. The method can be used for power converters, control devices or protection relays for shunt capacitors or filters used in power systems.Type: GrantFiled: October 12, 2012Date of Patent: June 9, 2015Assignee: Rockwell Automation Technologies, Inc.Inventors: Zhongyuan Cheng, Yuan Xiao, Ghodratollah Esmaeili Rineh, Manish Pande, Navid Zargari
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Publication number: 20150091484Abstract: Current source converters and control methods are presented for high dynamic performance by implementing a DC link current control loop parallel to one or more motor control loops, with a DC link current control command value for operating the current source rectifier being derived at least partially independent of the motor control command values, wherein certain implementations drive the current source rectifier to its maximum rated value, or the DC current command value can be set above an amount required by the current source inverter using a gain factor which can be fixed or can itself be adjusted based on one or more motor control error values for balancing as-needed dynamic performance and efficiency.Type: ApplicationFiled: October 1, 2013Publication date: April 2, 2015Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Semyon Royak, Manish Pande, Jingya Dai, Sang Woo Nam, Ehshan Al-Nabi
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Patent number: 8937796Abstract: Variable frequency motor drives and control techniques are presented in which filter capacitor faults are detected by measuring filter neutral node currents and/or voltages and detecting changes in a frequency component of the measured neutral condition and/or based on input current unbalance.Type: GrantFiled: June 26, 2012Date of Patent: January 20, 2015Assignee: Rockwell Automation Technologies, Inc.Inventors: Yuan Xiao, Navid Zargari, Manish Pande, Vijay Khatri
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Patent number: 8400085Abstract: Current source converter (CSC) based motor drives and control techniques are presented in which DC link current is regulated to a level set by the output inverter during dynamic braking operation by pulse width modulation of a braking resistance connection signal to maintain control of motor torque and speed while mitigating or preventing line side regenerative currents.Type: GrantFiled: February 24, 2010Date of Patent: March 19, 2013Assignee: Rockwell Automation Technologies, Inc.Inventors: Ghodratollah Esmaeili Rineh, Sang Woo Nam, Manish Pande, Zhongyuan Cheng
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Publication number: 20130057297Abstract: Power converters and control techniques are presented in which capacitor degradation is detected according to negative sequence current by computing an uncompensated negative sequence current and a negative sequence voltage, compensating the negative sequence current based on the negative sequence voltage, comparing the compensated or uncompensated negative sequence current with an automatically calculated threshold and selectively identifying suspected degradation of one or more capacitors if the compensated negative sequence current exceeds the threshold value. The method can be used for power converters, control devices or protection relays for shunt capacitors or filters used in power systems.Type: ApplicationFiled: October 12, 2012Publication date: March 7, 2013Inventors: Zhongyuan Cheng, Yuan Xiao, Ghodratollah Esmaeili Rineh, Manish Pande, Navid Zargari
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Patent number: 8350397Abstract: Switching control systems and methods are presented for controlling power conversion systems to provide electrical power to a grid or other load in which a synchronous machine is driven by a wind turbine or other prime mover to provide generator power to a switching type current source converter (CSC), with a current source rectifier (CSR) of the CSC being switched to provide d-axis control of the synchronous machine current based on grid power factor feedback, and with a current source inverter (CSI) of the CSC being switched to provide leading firing angle control and selective employment of dumping resists to dissipate excess generator energy in a fault mode when a grid voltage drops below a predetermined level.Type: GrantFiled: September 9, 2011Date of Patent: January 8, 2013Assignee: Rockwell Automation Technologies, Inc.Inventors: Yongqiang Lang, Navid Reza Zargari, Manish Pande, Bin Wu
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Publication number: 20120271572Abstract: Variable frequency motor drives and control techniques are presented in which filter capacitor faults are detected by measuring filter neutral node currents and/or voltages and detecting changes in a frequency component of the measured neutral condition and/or based on input current unbalance.Type: ApplicationFiled: June 26, 2012Publication date: October 25, 2012Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Yuan Xiao, Navid Zargari, Manish Pande, Vijay Khatri
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Patent number: 8259426Abstract: Variable frequency motor drives and control techniques are presented in which filter capacitor faults are detected by measuring filter neutral node current and/or voltages and detecting changes in the fundamental frequency component of the measured neutral condition at the fundamental frequency of the input power and/or based on input current unbalance.Type: GrantFiled: May 28, 2010Date of Patent: September 4, 2012Assignee: Rockwell Automation Technologies, Inc.Inventors: Yuan Xiao, Navid Zargari, Manish Pande, Vijay Khatri
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Publication number: 20110316490Abstract: Switching control systems and methods are presented for controlling power conversion systems to provide electrical power to a grid or other load in which a synchronous machine is driven by a wind turbine or other prime mover to provide generator power to a switching type current source converter (CSC), with a current source rectifier (CSR) of the CSC being switched to provide d-axis control of the synchronous machine current based on grid power factor feedback, and with a current source inverter (CSI) of the CSC being switched to provide leading firing angle control and selective employment of dumping resists to dissipate excess generator energy in a fault mode when a grid voltage drops below a predetermined level.Type: ApplicationFiled: September 9, 2011Publication date: December 29, 2011Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Yongqiang Lang, Navid Reza Zargari, Manish Pande, Bin Wu
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Publication number: 20110292696Abstract: Variable frequency motor drives and control techniques are presented in which filter capacitor faults are detected by measuring filter neutral node current and/or voltages and detecting changes in the fundamental frequency component of the measured neutral condition at the fundamental frequency of the input power and/or based on input current unbalance.Type: ApplicationFiled: May 28, 2010Publication date: December 1, 2011Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Yuan Xiao, Navid Zargari, Manish Pande, Vijay Khatri
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Patent number: 8030791Abstract: Power conversion apparatus and methods are presented for providing electrical power to a grid or other load in which a synchronous machine is driven by a wind turbine or other prime mover to provide generator power to a switching type current source converter (CSC), with a current source rectifier (CSR) of the CSC being switched to provide d-axis control of the synchronous machine current based on grid power factor feedback, and with a current source inverter (CSI) of the CSC being switched to provide leading firing angle control and selective employment of dumping resists to dissipate excess generator energy in a fault mode when a grid voltage drops below a predetermined level.Type: GrantFiled: July 31, 2008Date of Patent: October 4, 2011Assignee: Rockwell Automation Technologies, Inc.Inventors: Yongqiang Lang, Navid Reza Zargari, Manish Pande, Bin Wu
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Patent number: 7990097Abstract: Power conversion systems and methods are presented for damping common mode resonance, in which inverter or rectifier switching control signals are selectively modified according to a damping resistance current value computed using a predetermined virtual damping resistance value in parallel with an output or input capacitor and a measured output or input voltage value to mitigate or reduce common mode resonance in the converter.Type: GrantFiled: September 29, 2008Date of Patent: August 2, 2011Assignee: Rockwell Automation Technologies, Inc.Inventors: Zhongyuan Cheng, Navid Zargari, Yuan Xiao, Manish Pande
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Publication number: 20110057588Abstract: Current source converter (CSC) based motor drives and control techniques are presented in which DC link current is regulated to a level set by the output inverter during dynamic braking operation by pulse width modulation of a braking resistance connection signal to maintain control of motor torque and speed while mitigating or preventing line side regenerative currents.Type: ApplicationFiled: February 24, 2010Publication date: March 10, 2011Applicant: Rockwell Automation Technologies, Inc.Inventors: Ghodratollah Esmaeili Rineh, Sang Woo Nam, Manish Pande, Zhongyuan Cheng
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Publication number: 20100080028Abstract: Power conversion systems and methods are presented for damping common mode resonance, in which inverter or rectifier switching control signals are selectively modified according to a damping resistance current value computed using a predetermined virtual damping resistance value in parallel with an output or input capacitor and a measured output or input voltage value to mitigate or reduce common mode resonance in the converter.Type: ApplicationFiled: September 29, 2008Publication date: April 1, 2010Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: George Zhongyuan Cheng, Navid Zargari, Yuan Xiao, Manish Pande
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Patent number: 7683568Abstract: The switching rectifier and switching inverter on a motor drive unit are modulated to indirectly change the magnitude of current and voltage stored in DC link by controlling the magnetic field of the motor to correct for both power factor lead and power factor lag over a wide range of motor speeds and conditions while maintaining a predetermined motor operating point.Type: GrantFiled: September 28, 2007Date of Patent: March 23, 2010Assignee: Rockwell Automation Technologies, Inc.Inventors: Manish Pande, Yunwei Li
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Publication number: 20100025995Abstract: Power conversion apparatus and methods are presented for providing electrical power to a grid or other load in which a synchronous machine is driven by a wind turbine or other prime mover to provide generator power to a switching type current source converter (CSC), with a current source rectifier (CSR) of the CSC being switched to provide d-axis control of the synchronous machine current based on grid power factor feedback, and with a current source inverter (CSI) of the CSC being switched to provide leading firing angle control and selective employment of dumping resists to dissipate excess generator energy in a fault mode when a grid voltage drops below a predetermined level.Type: ApplicationFiled: July 31, 2008Publication date: February 4, 2010Applicant: Rockwell Automation Technologies, Inc.Inventors: Yongqiang Lang, Navid Reza Zargari, Manish Pande, Bin Wu
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Patent number: 7602132Abstract: Methods and systems are provided for capturing and saving motor drive information in a non-volatile memory to facilitate troubleshooting and motor fault analysis. The motor drive includes a power conversion system that provides electrical power to an electric motor and a control system providing a control input to the power conversion system, and an information capture system is provided with an information capture component to capture motor drive information and a non-volatile memory component to store the captured information.Type: GrantFiled: September 27, 2006Date of Patent: October 13, 2009Assignee: Rockwell Automation Technologies, Inc.Inventors: Wayne Ronald Davis, Manish Pande
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Publication number: 20090085510Abstract: The switching rectifier and switching inverter on a motor drive unit are modulated to indirectly change the magnitude of current and voltage stored in DC link by controlling the magnetic field of the motor to correct for both power factor lead and power factor lag over a wide range of motor speeds and conditions while maintaining a predetermined motor operating point.Type: ApplicationFiled: September 28, 2007Publication date: April 2, 2009Inventors: Manish Pande, Yunwei Li
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Patent number: 7368890Abstract: A method of operating a power converter in response to an interruption in an input power being provided to the power converter, as well as a power converter capable of performing such method and including a rectifier and an inverter coupled at least indirectly with one another, are disclosed. In at least some embodiments, the method includes (a) operating the rectifier so that energy stored in at least one first component coupled at least indirectly to at least one input terminal of the rectifier is transferred to an intermediate component coupled between the rectifier and the inverter, while the inverter is operated in a first disconnect mode, and (b) subsequently operating the inverter so that at least some of the energy transferred to the intermediate component is transferred to at least one output port of the power converter, while the rectifier is operated in a second disconnect mode.Type: GrantFiled: February 7, 2006Date of Patent: May 6, 2008Assignee: Rockwell Automation Technologies, Inc.Inventors: Manish Pande, Jason Cornelius Wiseman