Steven Hietpas - Academia.edu (original) (raw)

Papers by Steven Hietpas

2018 IEEE International Conference on Electro/Information Technology (EIT), 2018

Recent advancements in virtual reality (VR) technologies allow users to experience virtual enviro... more Recent advancements in virtual reality (VR) technologies allow users to experience virtual environment in lifelike fidelity. But users still have a very limited level of interactivity with virtual objects in these virtual environments. Current generation input/output devices are not sophisticated enough to emulate physical interactivity between the user and the virtual environment. In this paper, the construction method of building a new type of input output (I/O) device, a VR glove, that allows users to physically interact with the constituent virtual objects in the virtual environment, is presented. The VR glove tracks the user's physical finger movement and translates the movement to virtual fingers in a game environment, and if the virtual finger touches a virtual object, the motors attached at finger joints of the VR gloves spin up or down to generate haptic feedback to emulate the physical interactivity with the virtual object. The prototype glove covers a single finger. T...

In September 2002 South Dakota State University’s Electrical Engineering Department opened the do... more In September 2002 South Dakota State University’s Electrical Engineering Department opened the doors to its new state-of-the-art energy conversion and electronic drives laboratory. The automated features, computer instrumentation and monitoring components of the laboratory provide students with a working demonstration of electrical engineering in the areas of energy conversion and electronic drives. However, the most extraordinary aspect of the new lab is that it was designed, constructed and tested by thirteen undergraduate students, one graduate student, and a professor over a period of five years. This paper provides an overview of the laboratory, describes the educational benefits students gained throughout design and construction of the facility, and recounts the challenges and lessons the students learned throughout this process. The student perspective will provide considerable insight to those interested in employing students in the design of a new laboratory. New Laboratory...

Prototyping isthekeystepinthemanufactu industry tosavetimeandeffort. Successful prototyping n eff... more Prototyping isthekeystepinthemanufactu industry tosavetimeandeffort. Successful prototyping n efficient processes and systems thatintegrate allneces development steps.dSPACEoffers anefficient rapidco) prototyping process foranyindustry dealing withfeed) control. Theobjective ofthispaperistodemonstrate a documentedprocedure ofrapidcontrol prototyping permanent magnetDC (PMDC)motordrive forspeedco) using dSPACEandMathworks Simulink. Thecombined toc Simulink anddSPACEprovide themeansformodeling controller insoftware andapplying ittotheactual hardwar a digital signal processing board.Thispaperpresen comparison andanalysis betweenthesimulation results dSPACE/actual hardware results, whichagreed witheachc except forsomeminor differences. IndexTerms-- Control Prototyping, PMDC motordrive

2020 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT)

The increased penetration of photovoltaics (PV) and wind energy resources has raised awareness to... more The increased penetration of photovoltaics (PV) and wind energy resources has raised awareness to the maintenance of the future grid's stability and reliability. One emerging issue is the susceptibility to frequency instability when facing substantial generation-load imbalances due to decrease in rotational inertia of the grid. As a possible solution for frequency instability issues, virtual inertia (VI) is implemented using energy storage systems (ESSs). It is shown that, through a Linear Quadratic Regulator (LQR) controller, frequency change and the rate of change of frequency (ROCOF) of a system are optimally reduced. The designed LQR controller is further tested for the system with decreased inertia and it is able to maintain frequency change for up to 90% of decreased inertia and ROCOF only for up to 10% within the standards. The ROCOF was found to be more sensitive to decreased inertia than change in frequency, which suggests the use of an adaptive controller, instead of a fixed gain LQR controller, in the presence of significant parametric changes.

2007 Annual Conference & Exposition Proceedings

his M.E. in physics at South Dakota State University, he began working for Midwest Micro-Tek in B... more his M.E. in physics at South Dakota State University, he began working for Midwest Micro-Tek in Brookings S.D. There he designed 8 and 16-bit embedded controllers and wrote custom operating systems. He is fluent in several programming languages and many dialects of assembly. His controllers can be found in many applications from industry to military to NASA and in rides at Disney World. In 2003 Rick reentered academia at South Dakota State University to finish his M.E.; preparatory to his pursuit of a Ph.D. in Electrical Engineering. He also maintains a private consulting firm and is currently consulting for an ethanol group in South Dakota that is building small automated ethanol facilities.

2004 Annual Conference Proceedings

Energy Conversion courses for the past 100 years have primarily focused on the fundamental concep... more Energy Conversion courses for the past 100 years have primarily focused on the fundamental concepts of machine theory and the conversion between mechanical and electrical energy. Based on these concepts an undergraduate energy conversion course would typically cover topics in DC motors and AC synchronous and asynchronous motors. The trend in the last 10 years has been to reduce the amount of time spent on the fundamentals of DC and AC machines and to incorporate DC and AC electric drives into the course content. To support this trend, South Dakota State University has incorporated major revisions to the Energy Conversion Course which now includes topics in electric drives. With these changes, a new energy conversion and electric drives (ECED) laboratory has been designed and implemented, providing students a laboratory for which they actually operate systems that make use of these technologies, while conducting the laboratory exercises. The uniqueness of this laboratory is twofold: 1) The laboratory is completely automated, using (a) Human Machine Interface (HMI) and a power processing system (PPS) for safe distribution of resources (power sources and loads) student Power Workbenches (PWBs), and (b) Supervisory Control and Data Acquisition (SCADA) hardware/software to monitor and control Automatic Load Bank (ALBs), 2) the entire laboratory, including the HMI, PPS, PWBs, ALBs and SCADA system, were designed, constructed and tested by 13 undergraduate students and one graduate electrical engineering student over a period of four years. The new laboratory, commissioned in September of 2002, has worked flawlessly for three full semesters, and has been a showcase for prospective incoming electrical engineering students. This paper describes the general philosophy and design of the laboratory, the functionality and operational use of the laboratory, an overview of how students were integrated into the overall laboratory design and development phases, and finally, perspectives from students who are taking the modified version of the Energy Conversion course and its associated laboratory course.

2002 Annual Conference Proceedings

Over the last 40 years, the advent of power electronics has extensively impacted almost every asp... more Over the last 40 years, the advent of power electronics has extensively impacted almost every aspect of Electromechanical Energy Conversion (EMEC). The effective integration of power electronics, electric drives, and system related issues into the EMEC curriculum demanded a significant redesign of both the course and laboratory exercises. Using a "just-in-time" strategy, four laboratory exercises and corresponding lecture material associated with the buck and boost switch-mode power supply (SMPS), the 2-and 4-quadrant drive, and the permanent magnet DC (PMDC) motor has been developed. Before introducing SMPS, the fundamental operation and electrical equivalent of the PMDC motor is established. Using the volt-second energy balance approach, the buck and boost SMPS and their voltage transfer characteristics are developed. Using the principles of duality, the SMPS is extended to the 2-quadrant drive for the PMDC motor. Three laboratory exercises, associated with these topics, are conducted very near the presentation of the lecture course material. These three exercises culminate into a fourth exercise involving a 2-quadrant drive used as a powerprocessing converter between a solar array and a submersible solar-powered pump. An efficient pedagogical approach integrating these topics has resulted in a concise set of lecture materials and exercises. Elements of the course material and exercises are presented in this paper.

2001 Annual Conference Proceedings

Over the last 35 years, the advent of power electronics has extensively impacted almost every asp... more Over the last 35 years, the advent of power electronics has extensively impacted almost every aspect of Electromechanical Energy Conversion (EMEC). The effective integration of power electronics, electric drives, and system issues into the EMEC curriculum demands a significant redesign of both the course and laboratory exercises. One such redesign, currently being supported under the Adaptation and Implementation track of the NSF's CCLI program, is the subject of this paper. An existing undergraduate "electric machines" course has been converted into an "EMEC systems" course in which power generation, power processing, and end-use equipment are integrated. A "just-in-time" strategy has been adapted and implemented into the EMEC course. Of particular interest is the need to provide students with end-to-end instruction on the analysis and design steps followed in the development of an electric drive system.

IFAC Proceedings Volumes

Abstract This paper extends previous results on transfer function identification using Prony sign... more Abstract This paper extends previous results on transfer function identification using Prony signal analysis methods. Recent work resulted in a generalized Prony identification method that incorporates piecewise continuous system input signals; between points of discontinuity, the input is characterized by input eigenvalues and input residues. The two major phases of the Prony method are modified to account for the sampled-and-held input; a major contribution is made to the way in which the residues are fit to corresponding eigenvalues in the second phase.

IEEE PES General Meeting, 2010

This paper presents a study of a multi-grounded three-phase four-wire distribution system and dis... more This paper presents a study of a multi-grounded three-phase four-wire distribution system and discusses a line-to-ground fault location algorithm based on real time monitoring of current levels in the neutral-to-ground path at several locations throughout the primary feeder. The measurement technique, combined with a triangulation algorithm based on an exponential curve fitting approach, suggests a fault location accuracy of approximately

2014 IEEE PES T&D Conference and Exposition, 2014

This paper presents a design and implementation of communication-assisted protection strategy to ... more This paper presents a design and implementation of communication-assisted protection strategy to clear faults on a section of 115 kV transmission lines in Otter Tail Power system. The existing step-distance relaying scheme takes more than 25 cycles (417 ms) to clear faults on this particular three terminal line. In order to reliably clear all faults in less than 20 cycles (333 ms), the transmission line terminals communicate with each other through Ethernet to isolate and clear a fault as fast as possible. Through IEC 61850 Generic Object Oriented Substation Events (GOOSE) Messaging, the communicationbased Permissive Overreaching Transfer Trip (POTT) scheme is utilized to achieve a faster and reliable clearance of all faults. The proposed method has been verified with ASPEN software and implemented in hardware.

Applied Power Electronics …, 2007

... Kala Meah, Student Member, IEEE, Steven Hietpas, Senior Member, IEEE, and S. Ula, Senior memb... more ... Kala Meah, Student Member, IEEE, Steven Hietpas, Senior Member, IEEE, and S. Ula, Senior member, IEEE ... The objective of this paper is to demonstrate a documented procedure of rapid control prototyping permanent magnet DC (PMDC) motor drive for speed co] using ...

Industry Applications, IEEE …, 2000

1998 IEEE Rural Electric Power …, 1998

Voltage sags or short term reductions in the voltage levels constitute 68% of all power disturban... more Voltage sags or short term reductions in the voltage levels constitute 68% of all power disturbances. Voltage sags are becoming crucial problems in many process industry plants as well as in rural customers, resulting in lower production and serious equipment damage. A possible method to compensate for voltage sags is to install an AC-AC boost converter that is capable of

2018 IEEE International Conference on Electro/Information Technology (EIT), 2018

Recent advancements in virtual reality (VR) technologies allow users to experience virtual enviro... more Recent advancements in virtual reality (VR) technologies allow users to experience virtual environment in lifelike fidelity. But users still have a very limited level of interactivity with virtual objects in these virtual environments. Current generation input/output devices are not sophisticated enough to emulate physical interactivity between the user and the virtual environment. In this paper, the construction method of building a new type of input output (I/O) device, a VR glove, that allows users to physically interact with the constituent virtual objects in the virtual environment, is presented. The VR glove tracks the user's physical finger movement and translates the movement to virtual fingers in a game environment, and if the virtual finger touches a virtual object, the motors attached at finger joints of the VR gloves spin up or down to generate haptic feedback to emulate the physical interactivity with the virtual object. The prototype glove covers a single finger. T...

In September 2002 South Dakota State University’s Electrical Engineering Department opened the do... more In September 2002 South Dakota State University’s Electrical Engineering Department opened the doors to its new state-of-the-art energy conversion and electronic drives laboratory. The automated features, computer instrumentation and monitoring components of the laboratory provide students with a working demonstration of electrical engineering in the areas of energy conversion and electronic drives. However, the most extraordinary aspect of the new lab is that it was designed, constructed and tested by thirteen undergraduate students, one graduate student, and a professor over a period of five years. This paper provides an overview of the laboratory, describes the educational benefits students gained throughout design and construction of the facility, and recounts the challenges and lessons the students learned throughout this process. The student perspective will provide considerable insight to those interested in employing students in the design of a new laboratory. New Laboratory...

Prototyping isthekeystepinthemanufactu industry tosavetimeandeffort. Successful prototyping n eff... more Prototyping isthekeystepinthemanufactu industry tosavetimeandeffort. Successful prototyping n efficient processes and systems thatintegrate allneces development steps.dSPACEoffers anefficient rapidco) prototyping process foranyindustry dealing withfeed) control. Theobjective ofthispaperistodemonstrate a documentedprocedure ofrapidcontrol prototyping permanent magnetDC (PMDC)motordrive forspeedco) using dSPACEandMathworks Simulink. Thecombined toc Simulink anddSPACEprovide themeansformodeling controller insoftware andapplying ittotheactual hardwar a digital signal processing board.Thispaperpresen comparison andanalysis betweenthesimulation results dSPACE/actual hardware results, whichagreed witheachc except forsomeminor differences. IndexTerms-- Control Prototyping, PMDC motordrive

2020 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT)

The increased penetration of photovoltaics (PV) and wind energy resources has raised awareness to... more The increased penetration of photovoltaics (PV) and wind energy resources has raised awareness to the maintenance of the future grid's stability and reliability. One emerging issue is the susceptibility to frequency instability when facing substantial generation-load imbalances due to decrease in rotational inertia of the grid. As a possible solution for frequency instability issues, virtual inertia (VI) is implemented using energy storage systems (ESSs). It is shown that, through a Linear Quadratic Regulator (LQR) controller, frequency change and the rate of change of frequency (ROCOF) of a system are optimally reduced. The designed LQR controller is further tested for the system with decreased inertia and it is able to maintain frequency change for up to 90% of decreased inertia and ROCOF only for up to 10% within the standards. The ROCOF was found to be more sensitive to decreased inertia than change in frequency, which suggests the use of an adaptive controller, instead of a fixed gain LQR controller, in the presence of significant parametric changes.

2007 Annual Conference & Exposition Proceedings

his M.E. in physics at South Dakota State University, he began working for Midwest Micro-Tek in B... more his M.E. in physics at South Dakota State University, he began working for Midwest Micro-Tek in Brookings S.D. There he designed 8 and 16-bit embedded controllers and wrote custom operating systems. He is fluent in several programming languages and many dialects of assembly. His controllers can be found in many applications from industry to military to NASA and in rides at Disney World. In 2003 Rick reentered academia at South Dakota State University to finish his M.E.; preparatory to his pursuit of a Ph.D. in Electrical Engineering. He also maintains a private consulting firm and is currently consulting for an ethanol group in South Dakota that is building small automated ethanol facilities.

2004 Annual Conference Proceedings

Energy Conversion courses for the past 100 years have primarily focused on the fundamental concep... more Energy Conversion courses for the past 100 years have primarily focused on the fundamental concepts of machine theory and the conversion between mechanical and electrical energy. Based on these concepts an undergraduate energy conversion course would typically cover topics in DC motors and AC synchronous and asynchronous motors. The trend in the last 10 years has been to reduce the amount of time spent on the fundamentals of DC and AC machines and to incorporate DC and AC electric drives into the course content. To support this trend, South Dakota State University has incorporated major revisions to the Energy Conversion Course which now includes topics in electric drives. With these changes, a new energy conversion and electric drives (ECED) laboratory has been designed and implemented, providing students a laboratory for which they actually operate systems that make use of these technologies, while conducting the laboratory exercises. The uniqueness of this laboratory is twofold: 1) The laboratory is completely automated, using (a) Human Machine Interface (HMI) and a power processing system (PPS) for safe distribution of resources (power sources and loads) student Power Workbenches (PWBs), and (b) Supervisory Control and Data Acquisition (SCADA) hardware/software to monitor and control Automatic Load Bank (ALBs), 2) the entire laboratory, including the HMI, PPS, PWBs, ALBs and SCADA system, were designed, constructed and tested by 13 undergraduate students and one graduate electrical engineering student over a period of four years. The new laboratory, commissioned in September of 2002, has worked flawlessly for three full semesters, and has been a showcase for prospective incoming electrical engineering students. This paper describes the general philosophy and design of the laboratory, the functionality and operational use of the laboratory, an overview of how students were integrated into the overall laboratory design and development phases, and finally, perspectives from students who are taking the modified version of the Energy Conversion course and its associated laboratory course.

2002 Annual Conference Proceedings

Over the last 40 years, the advent of power electronics has extensively impacted almost every asp... more Over the last 40 years, the advent of power electronics has extensively impacted almost every aspect of Electromechanical Energy Conversion (EMEC). The effective integration of power electronics, electric drives, and system related issues into the EMEC curriculum demanded a significant redesign of both the course and laboratory exercises. Using a "just-in-time" strategy, four laboratory exercises and corresponding lecture material associated with the buck and boost switch-mode power supply (SMPS), the 2-and 4-quadrant drive, and the permanent magnet DC (PMDC) motor has been developed. Before introducing SMPS, the fundamental operation and electrical equivalent of the PMDC motor is established. Using the volt-second energy balance approach, the buck and boost SMPS and their voltage transfer characteristics are developed. Using the principles of duality, the SMPS is extended to the 2-quadrant drive for the PMDC motor. Three laboratory exercises, associated with these topics, are conducted very near the presentation of the lecture course material. These three exercises culminate into a fourth exercise involving a 2-quadrant drive used as a powerprocessing converter between a solar array and a submersible solar-powered pump. An efficient pedagogical approach integrating these topics has resulted in a concise set of lecture materials and exercises. Elements of the course material and exercises are presented in this paper.

2001 Annual Conference Proceedings

Over the last 35 years, the advent of power electronics has extensively impacted almost every asp... more Over the last 35 years, the advent of power electronics has extensively impacted almost every aspect of Electromechanical Energy Conversion (EMEC). The effective integration of power electronics, electric drives, and system issues into the EMEC curriculum demands a significant redesign of both the course and laboratory exercises. One such redesign, currently being supported under the Adaptation and Implementation track of the NSF's CCLI program, is the subject of this paper. An existing undergraduate "electric machines" course has been converted into an "EMEC systems" course in which power generation, power processing, and end-use equipment are integrated. A "just-in-time" strategy has been adapted and implemented into the EMEC course. Of particular interest is the need to provide students with end-to-end instruction on the analysis and design steps followed in the development of an electric drive system.

IFAC Proceedings Volumes

Abstract This paper extends previous results on transfer function identification using Prony sign... more Abstract This paper extends previous results on transfer function identification using Prony signal analysis methods. Recent work resulted in a generalized Prony identification method that incorporates piecewise continuous system input signals; between points of discontinuity, the input is characterized by input eigenvalues and input residues. The two major phases of the Prony method are modified to account for the sampled-and-held input; a major contribution is made to the way in which the residues are fit to corresponding eigenvalues in the second phase.

IEEE PES General Meeting, 2010

This paper presents a study of a multi-grounded three-phase four-wire distribution system and dis... more This paper presents a study of a multi-grounded three-phase four-wire distribution system and discusses a line-to-ground fault location algorithm based on real time monitoring of current levels in the neutral-to-ground path at several locations throughout the primary feeder. The measurement technique, combined with a triangulation algorithm based on an exponential curve fitting approach, suggests a fault location accuracy of approximately

2014 IEEE PES T&D Conference and Exposition, 2014

This paper presents a design and implementation of communication-assisted protection strategy to ... more This paper presents a design and implementation of communication-assisted protection strategy to clear faults on a section of 115 kV transmission lines in Otter Tail Power system. The existing step-distance relaying scheme takes more than 25 cycles (417 ms) to clear faults on this particular three terminal line. In order to reliably clear all faults in less than 20 cycles (333 ms), the transmission line terminals communicate with each other through Ethernet to isolate and clear a fault as fast as possible. Through IEC 61850 Generic Object Oriented Substation Events (GOOSE) Messaging, the communicationbased Permissive Overreaching Transfer Trip (POTT) scheme is utilized to achieve a faster and reliable clearance of all faults. The proposed method has been verified with ASPEN software and implemented in hardware.

Applied Power Electronics …, 2007

... Kala Meah, Student Member, IEEE, Steven Hietpas, Senior Member, IEEE, and S. Ula, Senior memb... more ... Kala Meah, Student Member, IEEE, Steven Hietpas, Senior Member, IEEE, and S. Ula, Senior member, IEEE ... The objective of this paper is to demonstrate a documented procedure of rapid control prototyping permanent magnet DC (PMDC) motor drive for speed co] using ...

Industry Applications, IEEE …, 2000

1998 IEEE Rural Electric Power …, 1998

Voltage sags or short term reductions in the voltage levels constitute 68% of all power disturban... more Voltage sags or short term reductions in the voltage levels constitute 68% of all power disturbances. Voltage sags are becoming crucial problems in many process industry plants as well as in rural customers, resulting in lower production and serious equipment damage. A possible method to compensate for voltage sags is to install an AC-AC boost converter that is capable of