Mariko Shirazi - Academia.edu (original) (raw)
Papers by Mariko Shirazi
Embedded frequency response measurement capability for monitoring and tuning of system dynamics i... more Embedded frequency response measurement capability for monitoring and tuning of system dynamics in digitally-controlled DC-DC converters
To reduce the cost of rural power generation and the environmental impact of diesel fuel usage, t... more To reduce the cost of rural power generation and the environmental impact of diesel fuel usage, the Alaska Energy Authority (AEA), Kotzebue Electric Association (KEA, a rural Alaskan utility), and the National Renewable Energy Laboratory (NREL), began a collaboration in late 1995 to implement a high-penetration wind-diesel hybrid power system in a village in northwest Alaska. The project was intended
As described, an initiative by NREL to design and construct a 9-MVA grid simulator to operate wit... more As described, an initiative by NREL to design and construct a 9-MVA grid simulator to operate with the existing 2.5 MW and new upcoming 5-MW dynamometer facilities will fulfill this role and bring many potential benefits to the U.S. wind industry with the ultimate goal of reducing wind energy integration costs.
APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition, 2007
2013 IEEE Green Technologies Conference (GreenTech), 2013
2013 IEEE 39th Photovoltaic Specialists Conference (PVSC), 2013
ABSTRACT Unprecedented investment in new renewable power (especially solar photovoltaic) capacity... more ABSTRACT Unprecedented investment in new renewable power (especially solar photovoltaic) capacity is occurring. As this new generation capacity is interconnected with the electric power system (EPS), it is critical that their grid interconnection systems have proper controls in place so that they react appropriately in case of an unintentional islanding event. Advanced controls and methods for unintentional islanding protection that go beyond existing standards, such as UL 1741 and IEEE Std 1547, are often required as more complex high penetration photovoltaic installations occur. This paper describes the implementation, experimental results, and validation of a power hardware-in-the-loop (PHIL)-based platform that allows for the rapid evaluation of advanced anti-islanding and other controls in complex scenarios. The PHIL-based approach presented allows for accurate, real-time simulation of complex scenarios by connecting a device under test to a software-based model of a local EPS. This approach was validated by conducting an unintentional islanding test of a photovoltaic inverter, as described in IEEE 1547.1, using both PHIL and discrete hardware-based test configurations. The comparison of the results of these two experiments demonstrates that this novel PHIL-based test platform accurately emulates traditional unintentional islanding tests. The advantage of PHIL-based testing over discrete hardware-only testing is demonstrated by completing an IEEE 1547.1 unintentional islanding test using a very precisely tuned resonant circuit that is difficult to realize with discrete hardware using PHIL.
2007 IEEE Power Electronics Specialists Conference, 2007
... Since it is impossible to ensure 100 % reliability of all critical power supply components, t... more ... Since it is impossible to ensure 100 % reliability of all critical power supply components, there is a need for real-time online converter health monitoring capable of measuring system performance and detecting faults or anomalies in the operation of the converter [1]. ...
35th Aerospace Sciences Meeting and Exhibit, 1997
2012 IEEE PES Innovative Smart Grid Technologies (ISGT), 2012
ABSTRACT With the publication of IEEE 1574.4 Guide for Design, Operation, and Integration of Dist... more ABSTRACT With the publication of IEEE 1574.4 Guide for Design, Operation, and Integration of Distributed Resource Island Systems with Electric Power Systems, there is an increasing amount of attention on not only the design and operations of microgrids, but also on the proper operation and testing of these systems. This standard provides alternative approaches and good practices for the design, operation, and integration of microgrids. This includes the ability to separate from and reconnect to part of the utility grid while providing power to the islanded power system. This presentation addresses the industry need to develop standardized testing and evaluation procedures for microgrids in order to assure quality operation in the grid connected and islanded modes of operation.
IEEE Transactions on Power Electronics, 2000
A digital control architecture is presented for electronic ballasts that provides a phase sweep f... more A digital control architecture is presented for electronic ballasts that provides a phase sweep for reliable, soft lamp ignition and a smooth transition to lamp current regulation mode. The controller is based on an inner phase loop for fast regulation of the resonant tank operating point and an outer current loop for lamp current regulation. The inner loop operates on
IEEE Transactions on Power Electronics, 2000
IEEE Transactions on Power Electronics, 2000
... Spikes introduced by the lamp voltage A/D converter caused the control chip to send one-clock... more ... Spikes introduced by the lamp voltage A/D converter caused the control chip to send one-clock-cycle shutdown pulses to the gate driver chip. ... References [1] MC Cosby, RM Nelms, "A Resonant Inverter for Electronic Ballast Applications," IEEE Trans. Industrial Electronics, Vol. ...
... tuning of digital controllers for point-of-load (POL) switching converters with wide range of... more ... tuning of digital controllers for point-of-load (POL) switching converters with wide range ofcapacitive loads. ... in order to face practical issues such as limit cycling conditions, output voltage tolerance specification ... results on a 12-to-1.5 V, 9 A, 200 kHz POL converter are provided to ...
Embedded frequency response measurement capability for monitoring and tuning of system dynamics i... more Embedded frequency response measurement capability for monitoring and tuning of system dynamics in digitally-controlled DC-DC converters
To reduce the cost of rural power generation and the environmental impact of diesel fuel usage, t... more To reduce the cost of rural power generation and the environmental impact of diesel fuel usage, the Alaska Energy Authority (AEA), Kotzebue Electric Association (KEA, a rural Alaskan utility), and the National Renewable Energy Laboratory (NREL), began a collaboration in late 1995 to implement a high-penetration wind-diesel hybrid power system in a village in northwest Alaska. The project was intended
As described, an initiative by NREL to design and construct a 9-MVA grid simulator to operate wit... more As described, an initiative by NREL to design and construct a 9-MVA grid simulator to operate with the existing 2.5 MW and new upcoming 5-MW dynamometer facilities will fulfill this role and bring many potential benefits to the U.S. wind industry with the ultimate goal of reducing wind energy integration costs.
APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition, 2007
2013 IEEE Green Technologies Conference (GreenTech), 2013
2013 IEEE 39th Photovoltaic Specialists Conference (PVSC), 2013
ABSTRACT Unprecedented investment in new renewable power (especially solar photovoltaic) capacity... more ABSTRACT Unprecedented investment in new renewable power (especially solar photovoltaic) capacity is occurring. As this new generation capacity is interconnected with the electric power system (EPS), it is critical that their grid interconnection systems have proper controls in place so that they react appropriately in case of an unintentional islanding event. Advanced controls and methods for unintentional islanding protection that go beyond existing standards, such as UL 1741 and IEEE Std 1547, are often required as more complex high penetration photovoltaic installations occur. This paper describes the implementation, experimental results, and validation of a power hardware-in-the-loop (PHIL)-based platform that allows for the rapid evaluation of advanced anti-islanding and other controls in complex scenarios. The PHIL-based approach presented allows for accurate, real-time simulation of complex scenarios by connecting a device under test to a software-based model of a local EPS. This approach was validated by conducting an unintentional islanding test of a photovoltaic inverter, as described in IEEE 1547.1, using both PHIL and discrete hardware-based test configurations. The comparison of the results of these two experiments demonstrates that this novel PHIL-based test platform accurately emulates traditional unintentional islanding tests. The advantage of PHIL-based testing over discrete hardware-only testing is demonstrated by completing an IEEE 1547.1 unintentional islanding test using a very precisely tuned resonant circuit that is difficult to realize with discrete hardware using PHIL.
2007 IEEE Power Electronics Specialists Conference, 2007
... Since it is impossible to ensure 100 % reliability of all critical power supply components, t... more ... Since it is impossible to ensure 100 % reliability of all critical power supply components, there is a need for real-time online converter health monitoring capable of measuring system performance and detecting faults or anomalies in the operation of the converter [1]. ...
35th Aerospace Sciences Meeting and Exhibit, 1997
2012 IEEE PES Innovative Smart Grid Technologies (ISGT), 2012
ABSTRACT With the publication of IEEE 1574.4 Guide for Design, Operation, and Integration of Dist... more ABSTRACT With the publication of IEEE 1574.4 Guide for Design, Operation, and Integration of Distributed Resource Island Systems with Electric Power Systems, there is an increasing amount of attention on not only the design and operations of microgrids, but also on the proper operation and testing of these systems. This standard provides alternative approaches and good practices for the design, operation, and integration of microgrids. This includes the ability to separate from and reconnect to part of the utility grid while providing power to the islanded power system. This presentation addresses the industry need to develop standardized testing and evaluation procedures for microgrids in order to assure quality operation in the grid connected and islanded modes of operation.
IEEE Transactions on Power Electronics, 2000
A digital control architecture is presented for electronic ballasts that provides a phase sweep f... more A digital control architecture is presented for electronic ballasts that provides a phase sweep for reliable, soft lamp ignition and a smooth transition to lamp current regulation mode. The controller is based on an inner phase loop for fast regulation of the resonant tank operating point and an outer current loop for lamp current regulation. The inner loop operates on
IEEE Transactions on Power Electronics, 2000
IEEE Transactions on Power Electronics, 2000
... Spikes introduced by the lamp voltage A/D converter caused the control chip to send one-clock... more ... Spikes introduced by the lamp voltage A/D converter caused the control chip to send one-clock-cycle shutdown pulses to the gate driver chip. ... References [1] MC Cosby, RM Nelms, "A Resonant Inverter for Electronic Ballast Applications," IEEE Trans. Industrial Electronics, Vol. ...
... tuning of digital controllers for point-of-load (POL) switching converters with wide range of... more ... tuning of digital controllers for point-of-load (POL) switching converters with wide range ofcapacitive loads. ... in order to face practical issues such as limit cycling conditions, output voltage tolerance specification ... results on a 12-to-1.5 V, 9 A, 200 kHz POL converter are provided to ...