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Won-Sang Im - IEEE Xplore Author Profile
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Won-Sang Im

Publications
18
Citations
319
Publications by Year
20092020
Co-Authors:
Show All Co-Authors (25)
Image of author Won-Sang Im

Won-Sang Im

Affiliation

LG Electronics, Incheon, South Korea

Publication Topics

Biography

Won-Sang Im (S'09–M'14) was born in Busan, South Korea, in 1981. He received the B.S., M.S., and Ph.D. degrees in electrical and computer engineering from the Pusan National University (PNU), Busan, Korea, in 2007, 2009, and 2013, respectively.,From 2013 to 2016, he was a Postdoctoral Researcher at Lehigh University, Bethlehem, PA, USA. Currently, he is a Professional with LG Electronics, Incheon, South Korea. His research interests include electric machine drives and power conversion system.(Based on document published on 22 July 2019).
Publications
18
Citations
319
Publications by Year
20092020
Co-Authors:
Show All Co-Authors (25)
Author's Published Works

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A Carrier-Based PWM Control Strategy for Three-Level NPC Inverter Based on Bootstrap Gate Drive Circuit

Jun-Hyung Jung;Hyun-Keun Ku;Won-Sang Im;Jang-Mok Kim

IEEE Transactions on Power Electronics
Year: 2020 | Volume: 35, Issue: 3 | Journal Article |
Cited by: Papers (11)
This paper proposes a pulsewidth modulation (PWM) control strategy for the efficient operation of the three-phase three-level neutral-point-clamped (NPC) inverters based on a bootstrap gate drive circuit. The bootstrap circuit used in the three-level NPC inverter has advantages in terms of the cost reduction and the compact circuit design. However, the bootstrap circuit has a drawback due to the l...Show More

A Carrier-Based PWM Control Strategy for Three-Level NPC Inverter Based on Bootstrap Gate Drive Circuit

Jun-Hyung Jung;Hyun-Keun Ku;Won-Sang Im;Jang-Mok Kim

Year: 2020 | Volume: 35, Issue: 3 | Journal Article |

Power Converters Based Advanced Experimental Platform for Integrated Study of Power and Controls

Wenxin Liu;Jang-Mok Kim;Cheng Wang;Won-Sang Im;Liming Liu;Hao Xu

IEEE Transactions on Industrial Informatics
Year: 2018 | Volume: 14, Issue: 11 | Journal Article |
Cited by: Papers (21)
With increasing interest in smart grid and renewable energy, significant investments have been allocated to promote related studies. Since there is a wide spectrum of topics to study, it is necessary to have an advanced experimental platform that can accommodate both system- and component-level studies, both hardware and algorithm designs, and both teaching and research. Unfortunately, such experi...Show More

Power Converters Based Advanced Experimental Platform for Integrated Study of Power and Controls

Wenxin Liu;Jang-Mok Kim;Cheng Wang;Won-Sang Im;Liming Liu;Hao Xu

Year: 2018 | Volume: 14, Issue: 11 | Journal Article |

Distributed virtual inertia based control of multiple photovoltaic systems in autonomous microgrid

Won-Sang Im;Cheng Wang;Wenxin Liu;Liming Liu;Jang-Mok Kim

IEEE/CAA Journal of Automatica Sinica
Year: 2017 | Volume: 4, Issue: 3 | Journal Article |
Cited by: Papers (64)
The large inertia of a traditional power system slows down system U+02BC s frequency response but also allows decent time for controlling the system. Since an autonomous renewable microgrid usually has much smaller inertia, the control system must be very fast and accurate to fight against the small inertia and uncertainties. To reduce the demanding requirements on control, this paper proposes to ...Show More

Distributed virtual inertia based control of multiple photovoltaic systems in autonomous microgrid

Won-Sang Im;Cheng Wang;Wenxin Liu;Liming Liu;Jang-Mok Kim

Year: 2017 | Volume: 4, Issue: 3 | Journal Article |

Maximum efficiency control method in 7-phase BLDC motor by changing the number of the excited phase windings

Sang-Woo Park;Hyung-Seok Park;Jong-Joo Moon;Jang-Mok Kim;Won-Sang Im

2016 IEEE Energy Conversion Congress and Exposition (ECCE)
Year: 2016 | Conference Paper |
Cited by: Papers (4)
This paper proposes a maximum efficiency control method in 7-phase brushless DC motors (7-phase BLDCMs) used for the ship propulsion system. In the same load condition, the system loss of the 7-phase BLDCM is dependent on the number of the excited windings and the instantaneous phase currents. Thus, it is necessary to determine the excitation number of the phase windings according to the load cond...Show More

Maximum efficiency control method in 7-phase BLDC motor by changing the number of the excited phase windings

Sang-Woo Park;Hyung-Seok Park;Jong-Joo Moon;Jang-Mok Kim;Won-Sang Im

Year: 2016 | Conference Paper |

Cooperative Controls for Pulsed Power Load Accommodation in a Shipboard Power System

Won-Sang Im;Cheng Wang;Liang Tan;Wenxin Liu;Liming Liu

IEEE Transactions on Power Systems
Year: 2016 | Volume: 31, Issue: 6 | Journal Article |
Cited by: Papers (43)
To isolate the negative impacts of pulsed power loads (PPL) in a shipboard power system (SPS), energy storage systems (ESS) are usually equipped for online ESS charging and offline ESS discharging for PPL deployment. In order to achieve fast and smooth ESS charging, the generation control and ESS charging control need to be well coordinated. In addition, control constraints, such as generation and...Show More

Cooperative Controls for Pulsed Power Load Accommodation in a Shipboard Power System

Won-Sang Im;Cheng Wang;Liang Tan;Wenxin Liu;Liming Liu

Year: 2016 | Volume: 31, Issue: 6 | Journal Article |

Sensorless control of 3-phase BLDC motors using DC current model

Won-Sang Im;Wenxin Liu;Jang-Mok Kim

2014 IEEE Energy Conversion Congress and Exposition (ECCE)
Year: 2014 | Conference Paper |
This paper proposes a new sensorless control algorithm for 3-phase BLDC (Brushless DC) motors with the 120° conduction mode. This algorithm uses the mathematical DC current model of the BLDC motor to estimate the rotor's speed and angle. The principle is similar to the conventional current model-based control of 3-phase PMSM (Permanent Magnet Synchronous Motor) with sinusoidal current waveform. Th...Show More

Sensorless control of 3-phase BLDC motors using DC current model

Won-Sang Im;Wenxin Liu;Jang-Mok Kim

Year: 2014 | Conference Paper |

Current reconstruction method with single DC-link current sensor based on the PWM inverter and AC motor

Kwang-Sik Kim;Han-Beom Yeom;Hyun-Keun Ku;Jang-Mok Kim;Won-Sang Im

2014 IEEE Energy Conversion Congress and Exposition (ECCE)
Year: 2014 | Conference Paper |
Cited by: Papers (8)
This paper proposes the new current reconstruction method of three-phase currents in case of using dc-link shunt resistor for three-phase AC motor. When dc-link shunt resistor is used for the acquisition of phase currents, there are the immeasurable regions in the hexagon of Space Vector Pulse Width Modulation(SVPWM). The conventional methods used the shift of the switching patterns of SVPWM to ex...Show More

Current reconstruction method with single DC-link current sensor based on the PWM inverter and AC motor

Kwang-Sik Kim;Han-Beom Yeom;Hyun-Keun Ku;Jang-Mok Kim;Won-Sang Im

Year: 2014 | Conference Paper |

A PWM control strategy for low-speed operation of three-level NPC inverter based on bootstrap gate drive circuit

Jun-Hyung Jung;Hyun-Geun Ku;Won-Sang Im;Jang-Mok Kim

2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014
Year: 2014 | Conference Paper |
Cited by: Papers (5) | Patents (1)
This paper proposes the pulse width modulation (PWM) control strategy for low-speed operation in the three-level neutral-point-clamped (NPC) inverters based on the bootstrap gate drive circuit. For the purpose of the cost reduction, several papers have paid attention to the bootstrap circuit applied to the three-level NPC inverter. However, the bootstrap gate driver IC cannot generate the gate sig...Show More

A PWM control strategy for low-speed operation of three-level NPC inverter based on bootstrap gate drive circuit

Jun-Hyung Jung;Hyun-Geun Ku;Won-Sang Im;Jang-Mok Kim

Year: 2014 | Conference Paper |

Capacitance estimation of DC-link capacitor in brushless DC motor drive systems

Jong-Joo Moon;Won-Sang Im;Jang-Mok Kim

2013 IEEE ECCE Asia Downunder
Year: 2013 | Conference Paper |
Cited by: Papers (3)
This paper proposes a capacitance estimation method for the dc-link capacitor in brushless DC motor (BLDCM) drive systems. The proposed method is performed in the generating mode of the BLDCM. In this mode, the inverse dc current flows to the capacitor and the capacitor voltage is increased by the generating operation. Hence, the capacitance can be obtained from the variation of the capacitor volt...Show More

Capacitance estimation of DC-link capacitor in brushless DC motor drive systems

Jong-Joo Moon;Won-Sang Im;Jang-Mok Kim

Year: 2013 | Conference Paper |

Novel phase advance method of BLDC motors for wide range speed operations

Jong-Joo Moon;Won-Sang Im;Jang-Mok Kim

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
Year: 2013 | Conference Paper |
Cited by: Papers (14)
This paper proposes a novel phase advance method of brushless DC motors (BLDCMs) for wide range speed operations. In order to extend the speed of BLDCMs, it is necessary to control phase currents to lead the phase back EMF by a phase advance method. Many phase advance methods have been studied for the speed expansion of the BLDCM during the last 20 years. However, these conventional methods increa...Show More

Novel phase advance method of BLDC motors for wide range speed operations

Jong-Joo Moon;Won-Sang Im;Jang-Mok Kim

Year: 2013 | Conference Paper |

Diagnosis and Fault-Tolerant Control of Three-Phase AC–DC PWM Converter Systems

Won-Sang Im;Jang-Mok Kim;Dong-Choon Lee;Kyo-Beum Lee

IEEE Transactions on Industry Applications
Year: 2013 | Volume: 49, Issue: 4 | Journal Article |
Cited by: Papers (86)
There is the possibility of an open-switch fault in a three-phase ac-dc pulsewidth-modulation (PWM) converter due to problems with the switching devices. In this case, the converter causes unbalanced input ac currents including increased harmonics and dc-link voltage ripples. In this paper, the one-open-switch fault case of six switching elements is analyzed by considering the switching patterns o...Show More

Diagnosis and Fault-Tolerant Control of Three-Phase AC–DC PWM Converter Systems

Won-Sang Im;Jang-Mok Kim;Dong-Choon Lee;Kyo-Beum Lee

Year: 2013 | Volume: 49, Issue: 4 | Journal Article |

Fault detection and tolerant control of 3-phase NPC active rectifier

Hyun-Keun Ku;Won-Sang Im;Jang-Mok Kim;Yong-Sug Suh

2012 IEEE Energy Conversion Congress and Exposition (ECCE)
Year: 2012 | Conference Paper |
Cited by: Papers (29)
Compared to conventional 2-level AC/DC PWM converter, the 3-phase NPC active rectifier has a high number of power semi-conductors. Hence the possibility of the open-switch faults is much higher. Due to the many number of active elements, the detection and the tolerant control of the open-switch faults are more complicated than the conventional 2-level converter. Furthermore, the open-switch faults...Show More

Fault detection and tolerant control of 3-phase NPC active rectifier

Hyun-Keun Ku;Won-Sang Im;Jang-Mok Kim;Yong-Sug Suh

Year: 2012 | Conference Paper |

Fault tolerant control methods of dual type independent multi-phase BLDC motor under open-switch fault conditions

Hong-Jun Heo;Won-Sang Im;Jang-Mok Kim;Young-Gook Kim;Jin-Seok Oh

2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
Year: 2012 | Conference Paper |
Cited by: Papers (6)
Open-switch faults of DI-BLDCM (Dual type Independent multi-phase BLDC Motor) drive system cause torque ripple of motor. This torque ripple makes unwanted noise and vibrations in the drive system. This paper proposes four control methods for fault tolerant system and analyzes characteristics of DI-BLDCM controlled by the methods. All proposed methods can reduce the torque ripple to similar level u...Show More

Fault tolerant control methods of dual type independent multi-phase BLDC motor under open-switch fault conditions

Hong-Jun Heo;Won-Sang Im;Jang-Mok Kim;Young-Gook Kim;Jin-Seok Oh

Year: 2012 | Conference Paper |

Fault tolerant control strategy of 3-phase AC-DC PWM converter under multiple open-switch faults conditions

Won-Sang Im;Jong-Joo Moon;Jang-Mok Kim;Dong-Choon Lee;Kyo-Beum Lee

2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
Year: 2012 | Conference Paper |
Cited by: Papers (5)
3-phase AC-DC PWM (Pulse Width Modulation) converter has a possibility of open-switch faults due to some trouble of the switching devices and gate drivers. In this case, the converter causes imbalance of the AC input currents and the pulsation of DC-link voltage. This paper proposes fault tolerant control strategy of 3-phase AC-DC PWM converter under multiple open-switch fault conditions. So a det...Show More

Fault tolerant control strategy of 3-phase AC-DC PWM converter under multiple open-switch faults conditions

Won-Sang Im;Jong-Joo Moon;Jang-Mok Kim;Dong-Choon Lee;Kyo-Beum Lee

Year: 2012 | Conference Paper |

Diagnosis and fault-tolerant control of 3-phase AC-DC PWM converter system

Won-Sang Im;Jang-Mok Kim;Dong-Choon Lee;Kyo-Beum Lee

2011 IEEE Energy Conversion Congress and Exposition
Year: 2011 | Conference Paper |
Cited by: Papers (5)
There is a possibility of open-switch fault of 3-phase AC-DC PWM (Pulse Width Modulation) converter due to some troubles of the switching devices. In this case, the converter causes the unbalanced input AC currents including harmonics and the ripple of DC-link voltage. This paper proposes the phase detection method of open-switch fault and the fault-tolerant control algorithm to minimize the unbal...Show More

Diagnosis and fault-tolerant control of 3-phase AC-DC PWM converter system

Won-Sang Im;Jang-Mok Kim;Dong-Choon Lee;Kyo-Beum Lee

Year: 2011 | Conference Paper |

An overmodulation method for space vector PWM inverters with dc-link shunt resistor

Jee-Sang Lee;Won-Sang Im;Jang-Mok Kim

8th International Conference on Power Electronics - ECCE Asia
Year: 2011 | Conference Paper |
Cited by: Papers (11)
In order to lower the cost and expand the working range of pulse width modulation voltage source inverter (PWM-VSI), the control method under the overmodulation mode with a dc-link shunt resistor is developed. The voltage utilization according to un implementable region is analyzed in overmodulation region. By using the conventional phase reconstruction method, the minimized un-implementable regio...Show More

An overmodulation method for space vector PWM inverters with dc-link shunt resistor

Jee-Sang Lee;Won-Sang Im;Jang-Mok Kim

Year: 2011 | Conference Paper |

Power electronics enabled energy management for energy storage with extended cycle life and improved fuel economy in a PHEV

Lei Wang;Xiaohu Liu;Hui Li;Won-Sang Im;Jang-Mok Kim

2010 IEEE Energy Conversion Congress and Exposition
Year: 2010 | Conference Paper |
Cited by: Papers (4)
Active combination of the ultracapacitor (UC) with an energy dense Lithium-ion (Li-ion) battery (BU) is seen as the promising approach in plug-in hybrid electric vehicle (PHEV) application. In this paper, the sizing of Li-ion battery and ultracapacitor, as well as the degree of hybridization (DH) between UC power and battery power are analyzed through a different perspective, i.e., to solve an opt...Show More

Power electronics enabled energy management for energy storage with extended cycle life and improved fuel economy in a PHEV

Lei Wang;Xiaohu Liu;Hui Li;Won-Sang Im;Jang-Mok Kim

Year: 2010 | Conference Paper |

Analysis and compensation of current measurement errors in a doubly fed induction generator

Won-Sang Im;Seon-Hwan Hwang;Jang-Mok Kim;Jeaho Choi

2009 IEEE Energy Conversion Congress and Exposition
Year: 2009 | Conference Paper |
Cited by: Patents (1)
This paper proposes a compensator to reduce the power ripple of DFIG generated by offset and scaling errors of the rotor current sensors. The input signal of the proposed compensator adopts the synchronous d-axis current of the rotor. The amplitude of the stator current is low but that of the rotor current is high. Also stator current is variable according to the wind intensity but the rotor curre...Show More

Analysis and compensation of current measurement errors in a doubly fed induction generator

Won-Sang Im;Seon-Hwan Hwang;Jang-Mok Kim;Jeaho Choi

Year: 2009 | Conference Paper |

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