강신원 교수

This paper proposes a model predictive control based on three voltage vectors for an interior permanent-magnet synchronous motor in a rotating reference frame. The proposed method can obtain the reference voltage vector quickly by predicting only one voltage vector during one sampling period using the characteristics of the deadbeat control. In addition, to obtain better steady-state performance, the optimal vector duration ratios can be obtained from the cost function to minimize the error betw

This study proposes a novel robust predictive current control that is based on a discrete‐time disturbance observer for an interior permanent magnet synchronous motor (IPMSM), does not require rotor flux information. To confirm the effects of the current control response on a parameter mismatch, the parameter sensitivity for the current prediction of a conventional deadbeat predictive current control (DPCC) is analysed. With the proposed method, disturbances owing to a parameter mismatch, rotor

In this study, a circulating current suppression strategy is proposed using high‐frequency voltage compensation when asynchronous carriers exist between modules in modular and scalable inverter systems (MSISs). In MSIS, an inverter and a control unit constitute one module. Because each module is connected in parallel, the power capacity and efficiency can be increased. However, according to the switching state in the parallel module, a circulating current can be generated. This current causes st

This paper proposes a control strategy for high power factor without electrolytic capacitor in home appliance. The proposed system consists of single-phase diode rectifier, small film capacitor (20uF), three-phase voltage inverter and AC motor. In order to obtain a high power factor, this paper proposes a new control method that delays q-axis current compared with phase of grid voltage. The method is based on the field-oriented control, PI controller, quasi-PR controller and space vector pulse w

The parallel three-phase voltage source inverters have been widely used to raise system power rating. However, the zero-sequence circulating current can be generated according to switching method in the direct connection scheme. Zero-sequence circulating current not only distorts current but also reduces system reliability and efficiency. In this paper, model predictive control scheme is proposed for the parallel three-phase voltage inverters-fed interior permanent magnet synchronous motor with

Since the rotor resistance is associated with a slip calculation, the precise identification of rotor resistance has a crucial impact on the dynamic behavior of the whole Indirect Field Orientation Control. This paper presents a new technique based on Model Reference Adaptive System scheme for on-line estimation of an induction motor rotor resistance. The proposed rotor parameter identification is based on the rotor flux of along the d-axis, where the voltage model of induction motor is adapted

In this paper, a strategy for controlling a powertrain of the electric propulsion ships is proposed. The proposed control strategy enables rapid acceleration and deceleration of the vessel by actively limiting output torque reflecting limitations of the components in the powertrain. The propulsion motor's output power and its rate are both controlled to satisfy the limits of each component, including gear and propeller. The effectiveness of the proposed method has been verified based on the exte

Parallel three-phase voltage source inverters in a direct connection configuration are widely used to increase system power ratings. A zero-sequence circulating current can be generated according to the switching method; however, the zero-sequence circulating current not only distorts current, but also reduces the system reliability and efficiency. In this paper, a model predictive control scheme is proposed for parallel inverters to drive an interior permanent magnet synchronous motor with zero

There are many cases of ground subsidence in abandoned mine area which is usaully hard to predict. It can cause hugh damage in properties and threaten human lives. Therefore, precautionary monitoring and prediction system for ground subsidence is of great necessity. Current measurement for ground subsidence is now imposed at the flimsy ground of exhausted mine and deployed. But analyzed data from manual measurement are only effective at corresponded measurement area. So it is hard to measure the

This paper proposes a control strategy for high power factor without electrolytic capacitor in home appliance. The proposed system consists of single-phase diode rectifier, small film capacitor (14uF), three-phase voltage inverter and AC motor. In order to obtain a high power factor, this paper proposes a new control method that delays q-axis current compared with phase of grid voltage. The method is based on the field-oriented control and uses the space vector pulse width modulation (SVPWM). Th

The study aims to introduce the concept of the constructed environment and its influence on tourism destination management in Northeast India. Post-pandemic, the region shows significant recovery, necessitating a systematic approach to managing the sector. To establish the relevance of the study's concept, the literature review is based on a triangulation review matrix. The study has three main objectives: firstly, to highlight the status of the constructed environment; secondly, to determine it