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Jung-Muk Choe,Young-Jin Lee,Younghoon Cho,Gyu-Ha Choe 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
In this paper, a single current sensor technique (SCST) is proposed for single-phase full-bridge inverters. The proposed SCST measures the currents of multiple branches at the same time, and reconstructs the average inductor, capacitor, and load current in a single switching cycle. Since all of the branches’ current in the LC filter and the load are obtained using the SCST, both the inductor and the capacitor current feedback schemes can be selectively applied while taking advantages of each other. This paper also analyzes both of the current feedback schemes from the view point of the closed-loop output impedance. The proposed SCST and the analysis in this paper are verified through experiments on a 3kVA single-phase uninterruptible power supply (UPS).
Parallel PCS Interconnection Current Surge Elimination Technique Using a Coupled Inductor
Jung-Muk Choe,Byeng-Joo Byen,Gyu-Ha Choe 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.5
This study proposes a coupled inductor method for the parallel operation of a power conditioning system (PCS). When primary and secondary currents flow in the same direction in a coupled inductor, total flux and inductance are cancelled; when currents flow in opposite directions, each flux becomes an individual inductor. These characteristics are applied in the parallel operation of a PCS. To connect at a grid code, abnormal current, which is barred under the grid connection code, is blocked by using a coupled inductor. A design based on the capacity and current duration time of a PCS is verified through hardware implementation. Experiment results show the effectiveness of variance reduction.
Jung-Muk (Michael) Choe,Luis Arnedo,Yongduk Lee,Zakdy Sorchini,Alessandro Mignogna,Ismail Agirman,Hanjong Kim 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper discloses Model-based design (MBD) and auto code generation for power electronics applications to show work flow, computation comparison, and test results. The tool can support design, simulation and code generation, so anticipation of the verification and validation stage and implementation of the processor are much convenient in the MBD work flow. Vienna rectifier design is chosen for the design example. The experimental test shows different switching frequency and abnormal grid condition tests using the generated code.
Choe, Jung-Muk,Lee, Young-Jin,Cho, Younghoon,Choe, Gyu-Ha The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
In this paper, a single current sensor technique (SCST) is proposed for single-phase full-bridge inverters. The proposed SCST measures the currents of multiple branches at the same time, and reconstructs the average inductor, capacitor, and load current in a single switching cycle. Since all of the branches' current in the LC filter and the load are obtained using the SCST, both the inductor and the capacitor current feedback schemes can be selectively applied while taking advantages of each other. This paper also analyzes both of the current feedback schemes from the view point of the closed-loop output impedance. The proposed SCST and the analysis in this paper are verified through experiments on a 3kVA single-phase uninterruptible power supply (UPS).
Parallel PCS Interconnection Current Surge Elimination Technique Using a Coupled Inductor
Choe, Jung-Muk,Byen, Byeng-Joo,Choe, Gyu-Ha The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.5
This study proposes a coupled inductor method for the parallel operation of a power conditioning system (PCS). When primary and secondary currents flow in the same direction in a coupled inductor, total flux and inductance are cancelled; when currents flow in opposite directions, each flux becomes an individual inductor. These characteristics are applied in the parallel operation of a PCS. To connect at a grid code, abnormal current, which is barred under the grid connection code, is blocked by using a coupled inductor. A design based on the capacity and current duration time of a PCS is verified through hardware implementation. Experiment results show the effectiveness of variance reduction.
Load Disturbance Compensation for Stand-alone Inverters Using an Inductor Current Observer
Jung-Muk Choe,Seungryul Moon,Byeng-Joo Byen,Jih-Sheng Lai,Young-Bae Lim,Gyu-Ha Choe 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2
A control scheme for stand-alone inverters that utilizes an inductor current observer (ICO) is proposed. The proposed method measures disturbance load currents using a current sensor and it estimates the inductor current using the ICO. The filter parameter mismatch effect is analyzed to confirm the ICO’s controllability. The ICO and controllers are designed in a continuous-time domain and transferred to a discrete-time domain with a digital delay. Experimental results demonstrate the effectiveness of the ICO using a 5-kVA single-phase stand-alone inverter prototype. The experimental results demonstrate that the observed current matches the actual current and that the proposed method can archive a less than 2.4% total harmonic distortion (THD) sinusoidal output waveform under nonlinear load conditions.
Load Disturbance Compensation for Stand-alone Inverters Using an Inductor Current Observer
Choe, Jung-Muk,Moon, Seungryul,Byen, Byeng-Joo,Lai, Jih-Sheng,Lim, Young-Bae,Choe, Gyu-Ha The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2
A control scheme for stand-alone inverters that utilizes an inductor current observer (ICO) is proposed. The proposed method measures disturbance load currents using a current sensor and it estimates the inductor current using the ICO. The filter parameter mismatch effect is analyzed to confirm the ICO's controllability. The ICO and controllers are designed in a continuous-time domain and transferred to a discrete-time domain with a digital delay. Experimental results demonstrate the effectiveness of the ICO using a 5-kVA single-phase stand-alone inverter prototype. The experimental results demonstrate that the observed current matches the actual current and that the proposed method can archive a less than 2.4% total harmonic distortion (THD) sinusoidal output waveform under nonlinear load conditions.
A Capacitor Current Control for Stand-alone Inverters Using an Inductor Current Observer
Jung-Muk Choe,Byeng-Joo Byen,Seungryul Moon,Jih-Sheng Lai 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper discussed an inductor current observer design that employs a capacitor current control model for single-phase stand-alone inverters. The singlephase stand-alone inverter is analyzed via modeling. The proposed solution is able to guarantee a fast dynamic response and also a precise compensation of a distortion load. Moreover, with a proper design of observer parameters, it is possible to build a precise inductor current information without the inductor current sensor. The simulation and experimental results show that the performance of the proposed controller.
Zinc-Bromine 레독스 플로우 배터리를 이용한 독립형 마이크로그리드 ESS DC-DC 컨버터 설계 및 실증
최중묵(Jung-Muk Choe),라순길(Sun-Gil Ra),한동화(Dong-Hwa Han),이영진(Yong-Jin Lee),최규하(Gyu-Ha Choe) 전력전자학회 2014 전력전자학회 논문지 Vol.19 No.2
This paper proposes ESS DC-DC Converter using Redox Flow Battery (RFB) for stand-alone microgrid. Price, safety, expandability and dynamics are crucial in ESS. Reports show that Zinc-bromine (ZnBr) RFB is the best choice in ESS. Simple electrical ZnBr RFB model is obtained from charging test. DC-DC converter Inductor current-DClink Voltage model is proposed for the DC microgrid. For the controller design in z-domain, the K-factor method is by considering nature of the digital controller. The control performance has been verified with simulation and hardware experiments. Lastly 10kW DC microgrid using RFB test result is shown.