Seunghoon Baek

Seunghoon Baek

Virginia Polytechnic Institute and State University

H-index: 4

North America-United States

About Seunghoon Baek

Seunghoon Baek, With an exceptional h-index of 4 and a recent h-index of 4 (since 2020), a distinguished researcher at Virginia Polytechnic Institute and State University, specializes in the field of Power electronics.

His recent articles reflect a diverse array of research interests and contributions to the field:

Engine Vibration Reduction Control in HEV using Average Periodic Delay Repetitive Controller

Space Vector Pulsewidth Modulation Based on a Novel Digital Coordinate Transformation for Multilevel Inverters Eliminating Common-Mode Voltages

Space Vector Techniques for a Binary-Cascaded Multilevel Inverter Operating Under Reduced Common-Mode Voltage With Reduced Commutations

Series DC Arc Fault Detection Using a Wavelet-Based Filter Bank with Statistical Analysis

Active Gate Driver With Turn-off Delay Control for Voltage Balancing of Series–Connected SiC MOSFETs

Input AC Voltage Sensorless Control Method for Single-Phase PFC Converter Using Frequency Estimator

Simple Current Control Without Grid Voltage Sensor for Traction Solid-State Transformer

Average Periodic Delay-Based Frequency Adaptable Repetitive Control With a Fixed Sampling Rate and Memory of Single-Phase PFC Converters

Seunghoon Baek Information

University

Virginia Polytechnic Institute and State University

Position

___

Citations(all)

68

Citations(since 2020)

68

Cited By

14

hIndex(all)

4

hIndex(since 2020)

4

i10Index(all)

2

i10Index(since 2020)

2

Email

University Profile Page

Virginia Polytechnic Institute and State University

Seunghoon Baek Skills & Research Interests

Power electronics

Top articles of Seunghoon Baek

Engine Vibration Reduction Control in HEV using Average Periodic Delay Repetitive Controller

Authors

Sanghun Han,Younghoon Cho,Seunghoon Baek,Keychun Park

Journal

IEEE Transactions on Transportation Electrification

Published Date

2024/3/7

This paper proposes an engine vibration reduction control in hybrid electric vehicles (HEVs). The proposed method consists of a torque reference generator and an average periodic delay repetitive controller (APDRC). The torque reference generator produces a compensatory torque command synchronized with the phase of the flywheel in the internal combustion engine (ICE) using simple control rules and harmonic torque equations. The APDRC achieves high accuracy current control of the electric motor connected to the ICE to track the torque command containing the fundamental and harmonic components. The proposed method does not rely on any estimator or mechanical model of the HEV powertrain so that it can be universally applied to mass-produced vehicles that adopt the same ICE and electric motor. The experimental results conducted on a 48V mild HEV (MHEV) demonstrate that the proposed …

Space Vector Pulsewidth Modulation Based on a Novel Digital Coordinate Transformation for Multilevel Inverters Eliminating Common-Mode Voltages

Authors

Bryan Gutierrez,Seunghoon Baek,Jih-Sheng Lai

Journal

IEEE Transactions on Industrial Electronics

Published Date

2024/2/7

A novel jk -coordinate transformation is proposed in this article to operate three-phase multilevel inverters (MLIs) with space vector pulsewidth modulation (SVPWM) eliminating the common-mode voltage in the system. The proposed SVPWM in jk coordinates can directly compute online the zero common-mode voltage (ZCMV) switching states while allowing a straightforward implementation of the reduced-loss switching sequence and reduced commutations between sequence transitions. Also, the computation of a single jk vector among the nearest three vectors is sufficient to generate the entire optimized switching sequence. Furthermore, the proposed technique is scalable to MLIs with a larger number of levels without impacting its performance and computational complexity. Consequently, the proposed ZCMV SVPWM technique exhibits minimal computation time compared to preceding techniques that utilize …

Space Vector Techniques for a Binary-Cascaded Multilevel Inverter Operating Under Reduced Common-Mode Voltage With Reduced Commutations

Authors

Bryan Gutierrez,Seunghoon Baek,Jih-Sheng Lai

Journal

IEEE Open Journal of the Industrial Electronics Society

Published Date

2022/10/12

This article presents a novel space vector pulsewidth modulation (SVPWM) for a three-phase binary-cascaded multilevel inverter (BCMLI). The SVPWM could become impractical in multilevel inverters (MLIs) because of its increasing complexity with a larger number of levels. The gh coordinate system can ease the digital implementation, but to generate the inverter's abc states from the nearest three vectors (NTVs), iterative computations are required every sampling instant. This article proposes a further reduction of computations by directly generating the abc state with minimum common-mode voltage (CMV) from a gh vector. Subsequently, only one vector among the NTVs is required for implementing the proposed SVPWM. The reduced CMV profile within the NTVs further permits the reduction of commutations by clamping one phase during a sampling period. The presented technique exhibits full dc bus …

Series DC Arc Fault Detection Using a Wavelet-Based Filter Bank with Statistical Analysis

Authors

Joseph Yeager,Hsin-Che Hsieh,Seunghoon Baek,Jih-Sheng Lai

Published Date

2022/10/9

A real-time algorithm is developed for the detection of series dc arc faults in solar photovoltaic installations. A wavelet-based filter bank is used to condition the sensed dc input current, which is sampled using an isolated sigma-delta ADC. The filter bank improves the robustness of the algorithm to false trips by attenuating the 120 Hz ripple and switching harmonics. In the algorithm, the variance of the filter bank output is calculated and compared to an upper threshold value to determine if a fault has occurred. The algorithm senses a fault when the upper threshold is exceeded, and the dc bus voltage falls below a predefined lower limit. The algorithm can detect a series arc fault in under two seconds and is found to be robust to false trips induced by power converter switching harmonics. The filter bank is implemented using 32-bit floating point values, and the detection algorithm is programmed on a microcontroller.

Active Gate Driver With Turn-off Delay Control for Voltage Balancing of Series–Connected SiC MOSFETs

Authors

Myeongsu Son,Younghoon Cho,Seunghoon Baek

Journal

IEEE Transactions on Power Electronics

Published Date

2022/7/6

Connecting semiconductor switches in series is a way to increase the voltage rating of a power electronic converter. However, if two switches are directly connected without any special effort, an uneven voltage between the switches can occur due to nonidentical characteristics of them. A significant voltage imbalance may destroy the switches, and both thermal and loss imbalance also lead to the unstable system. Since a silicon carbide (SiC) metal–oxide–semiconductor field–effect transistor ( mosfet ) has a faster switching speed and higher voltage blocking capability than silicon (Si) devices, existing voltage balancing methods for Si devices may not be suitable. This article proposes a voltage balancing method that controls turn- off delay time of the switch by adding one bipolar junction transistor (BJT) on a gate turn- off path. Depending on the base voltage of the BJT, turn- off resistance and delay time are …

Input AC Voltage Sensorless Control Method for Single-Phase PFC Converter Using Frequency Estimator

Authors

Seunghoon Baek,Chun-Gi Yun,Younghoon Cho

Published Date

2021/10/10

This paper proposes an input ac voltage sensorless control method for single-phase power factor correction (PFC) converter to achieve a simple and cost-effective PFC converter system. In the conventional control method of PFC converter, the input voltage sensor is necessary for a synchronization control between the input voltage and current. The proposed method without the input voltage sensor offers the control performance as much as the conventional method. To implement the converter control, the proposed method consists of the sinusoidal reference generator and frequency estimator using the control variables of the input current and dc-link voltage. It also provides the current error rejection capability under the frequency deviation. Both the simulations and experiments on a 1.6 kW single-phase boost PFC converter are implemented to validate the proposed method.

Simple Current Control Without Grid Voltage Sensor for Traction Solid-State Transformer

Authors

Chun-Gi Yun,Seunghoon Baek,Hanyoung Bu,Younghoon Cho,Jin-Hyuk Park,Myung-Yong Kim

Journal

Journal of Power Electronics

Published Date

2021/2/8

This paper proposes a simple current control method without a grid voltage sensor for a rectifier of traction solid-state transformer. The proposed control scheme estimates the phase angle of grid voltage from the fundamental frequency current of the grid. The extracted phase signal is normalized to generate a sinusoidal current reference by adopting a scaling factor to achieve a unity gain. Since the proposed control method operates without the grid voltage sensor for power factor correction (PFC), it offers a cost-effective solution with a simple implementation structure. However, this method cannot guarantee its control performance under weak grid conditions, where the frequency of grid voltage often varies. Thus, the control parameters of the proposed method are discussed and analyzed to minimize performance degradation. To verify the feasibility of the proposed control method, simulations and …

Average Periodic Delay-Based Frequency Adaptable Repetitive Control With a Fixed Sampling Rate and Memory of Single-Phase PFC Converters

Authors

Seunghoon Baek,Younghoon Cho,Jih-Sheng Lai

Journal

IEEE Transactions on Power Electronics

Published Date

2020/11/3

This article proposes an average periodic delay-based repetitive controller for power factor correction (PFC) converters undergoing grid frequency variations. When the grid frequency is changed, a conventional repetitive controller requires an interpolation method or additional memory to achieve frequency adaptability. Furthermore, frequency adaptability can also be realized using a variable sampling frequency; however, this requires additional computation effort and a multirate digital control system. In this article, with a fixed sampling frequency and memory length, the proposed repetitive controller, which generates the average periodic delay unit, maintains its harmonic compensation performance under grid frequency variations. In the proposed method, the control variables are updated depending on the phase of the grid voltage to reflect the grid frequency deviations in the average period delay unit. Because …

Analysis and Design of a Sine Wave Filter for GaN-Based Low-Voltage Variable Frequency Drives

Authors

Seunghoon Baek,Dongmin Choi,Hanyoung Bu,Younghoon Cho

Journal

Electronics

Published Date

2020/2

Gallium nitride (GaN) devices have been widely adopted to achieve high efficiency and high power density as alternative solutions to silicon devices. When the GaN power devices are used for variable frequency drive (VFD) systems, the high dv/dt pulses at the motor terminal, which induce shaft voltage and common mode current, should be carefully considered to ensure system reliability. Although the high dv/dt issues can be mitigated with a dv/dt filter method, it leads to performance degradation depending on cable length. Meanwhile, a matrix converter also becomes a next-generation power converter for the VFDs which has a regeneration capability and unity power factor. Thus, this paper discusses the GaN-based matrix converter for the VFD as a study case considering the motor terminal voltage quality and the common mode current. Also, a sine wave filter is adopted to cope with the terminal voltage quality irrespective of cable length. The optimized design procedure of the sine filter considers practical issues. Experimental results are presented to suggest a suitable solution for the GaN-based VFDs in accordance with the cable length.

Performance Improvement of Sensorless PMSM Drives using Motor Friendly Output Filter

Authors

Han-Young Bu,Seunghoon Baek,Sang-Hoon Han,Younghoon Cho

Journal

The Transactions of the Korean Institute of Power Electronics

Published Date

2020

A back-electromotive force (back-EMF) estimator for a permanent magnet synchronous motor (PMSM) uses the three-phase voltage references of a current controller to estimate rotor position. However, owing to voltage drops caused by the nonlinear characteristics of switches and passive components, the actual voltage in the motor and the three-phase voltage reference may not match. This study proposes a sensorless control method using a sine-wave output filter applied between the motor drive system and PMSM. The precise voltage in the motor can be measured with the sine-wave output filter and applied to the input of the estimator. Moreover, given that the voltage in the motor can be measured precisely at extremely low speeds, the stable operation range of the back-EMF estimator can be secured. Experimental results show that the proposed sensorless control method has stable operation at extremely low speeds compared with conventional sensorless control.

See List of Professors in Seunghoon Baek University(Virginia Polytechnic Institute and State University)

Seunghoon Baek FAQs

What is Seunghoon Baek's h-index at Virginia Polytechnic Institute and State University?

The h-index of Seunghoon Baek has been 4 since 2020 and 4 in total.

What are Seunghoon Baek's top articles?

The articles with the titles of

Engine Vibration Reduction Control in HEV using Average Periodic Delay Repetitive Controller

Space Vector Pulsewidth Modulation Based on a Novel Digital Coordinate Transformation for Multilevel Inverters Eliminating Common-Mode Voltages

Space Vector Techniques for a Binary-Cascaded Multilevel Inverter Operating Under Reduced Common-Mode Voltage With Reduced Commutations

Series DC Arc Fault Detection Using a Wavelet-Based Filter Bank with Statistical Analysis

Active Gate Driver With Turn-off Delay Control for Voltage Balancing of Series–Connected SiC MOSFETs

Input AC Voltage Sensorless Control Method for Single-Phase PFC Converter Using Frequency Estimator

Simple Current Control Without Grid Voltage Sensor for Traction Solid-State Transformer

Average Periodic Delay-Based Frequency Adaptable Repetitive Control With a Fixed Sampling Rate and Memory of Single-Phase PFC Converters

...

are the top articles of Seunghoon Baek at Virginia Polytechnic Institute and State University.

What are Seunghoon Baek's research interests?

The research interests of Seunghoon Baek are: Power electronics

What is Seunghoon Baek's total number of citations?

Seunghoon Baek has 68 citations in total.

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