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Priority based current control design in high speed sensorless PMSM drives
Seungryul Moon,Jung-Muk Choe,Younghoon Cho,Jih-sheng Lai 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The design of current controller in high speed sensorless permanent magnet synchronous machine (PMSM) drives is studied. Due to a computation and a digital pulse-width modulation (DPWM) delays, the maximum achievable speed and current controller bandwidth is limited in high speed application. In order to reduce the delays, a modification in control sequence is proposed, which can significantly reduce the effect of the delay caused by the digital controller. The control priority concept is adapted to reduce the execution time of the PWM generation algorithm. Experimental results demonstrate the high speed operation where 700 Hz fundamental frequency is achieved with 2 kHz switching frequency.
서비스 운영에서의 후회와 피드백 과정 시뮬레이션 -군부대 식수인원 산정에 대해-
이승률 ( Seungryul Lee ),이문걸 ( Moongul Lee ),문성암 ( Seongam Moon ) 한국로지스틱스학회 2021 로지스틱스연구 Vol.29 No.3
The purpose of this study is to examine the degree of regret of decision makers and how to feedback from surrounding’s stakeholders affects his/her reaction. We focused on the food ingredient’s ordering process in the military food service center to recompose the news vendor model situation. In the process of its ordering, its personnel have faced with several problems that include regrets to other alternatives unchosen. He/she determine and feedback the proper quantities with considering a senior commander (supervisor) opinion and his/her own insight and analysis results. We conducted a questionnaire survey for collecting several parameters including regret coefficient, feedback coefficient etc. and constructed a simulation model using their parameters and checking in parallel with the hypothesis that the regret of decision makers and the feedback of supervisor. In our experiment results we compared two models with the base using the average fixed heuristic. Through this study we show a positive effect on profit return for rational order decision by using Regret and Feedback model.
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.