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Rosen type 압전 변압기를 적용한 단락 사고 신호 검출 방법에 관한 연구
곽군평,안종수,김태규 대한전기학회 2022 전기학회논문지 Vol.71 No.7
In short circuit protection applications, a protection system with a current limiting circuit and a relay has been developed recently. In this system, the circuit can be configured simply by changing the relay contact. However, this system has disadvantage limited load power by parallel resistor for relay operation. In this paper, we propose a short circuit accident prevention system using a piezoelectric transformer to solve the problem of system load power limitation. In the event of a short circuit, we analyze the possibility of harmonic rejection and output voltage detection through a piezoelectric transformer. Through this, we studied the applicability of the short circuit accident preventi on system of the piezoelectric transformer.
시변 스위칭 함수를 이용한 가변구조제어계의 도달기간 제거방법
곽군평,주형민 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-
본 논문은 시변 스위칭함수를 이용하여 가변구조제어계의 단점인 도달기간을 제거하는 새로운 방법을 제시한다. 제시된 기법에 의해 전체 제어기간동안의 도달기간이 제거되었다. 효과적인 브러시리스 DC모타의 속도제어를 위해 제안된 시변스위칭 함수를 사용하여 속도 제어기를 설계하였다. This paper presents a new method for removing reaching phase in variable structure control systems using time varying switching function. By proposed method, during the entire control process reaching phase is removed. For effective speed control of trapezoidal type brushless DC motor, a time varying switching function based speed controller is developed as illustration.
선형 다변수 서보 메카니즘에 대한 슬라이딩 모드 제어기 설계
곽군평 國立 昌原大學校 産業技術硏究所 1999 産技硏論文集 Vol.13 No.-
This paper presents a new approach to designing a linear multivariable servo mechanism in the presence of disturbances. An observer-based approach is used to consider the disturbances as states of the controlled system. And, the resulting robust controller design for the linear multivariable servo mechanism involves the design of an asymptotic state observer which estimates both actual plant states and the disturbance states, and the design of a linear state feedback controller for the plant. The robust controller makes use of the continuous functions instead of the switching logics to obtain the sliding mode. Consequently, continuous control inputs are obtained to remove the undesirable chattering phenomena.
시변스위칭함수를 이용한 슬라이딩 모드 제어기의 도달기간 제거에 관한 연구
안호균,곽군평 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-
This paper presents the design of sliding mode Controller for removing reaching phase using time varying switching functions. For removing reaching phase in VSCS (Variable Structure Control Systems), a time varying switching surface is proposed to achieve the sliding mode during the entire control process. Numerical example is presented to demonstrate the effects of this approach.
선형 다변수 서보 메카니즘에 대한 슬라이딩 모드 제어기 설계
이범,곽군평 여수대학교 1998 論文集 Vol.12 No.2
This paper presents a new approach to designing a linear multivariable servo mechanism in the presence of disturbances. An observer-based approach is used to consider the disturbances as states of the controlled system. And, the resulting robust controller design for the linear multivariable servo mechanism involves the design of an asymptotic state observer which estimates both actual plant states and the disturbance states, and the design of a liner state feedback controller for the plant. The robust controller makes use of the continuous functions instead of the switching logics to obtain the sliding mode. Consequently, continuous control inputs are obtained to remove the undesirable chattering phenomena.
이범,곽군평 麗水水産大學校産業技術硏究所 1998 産業基術硏究所 論文集 Vol.7 No.-
This paper presents a new approach to remove the undesirable chattering phenomina, which are major drawbacks of the variable structure controller. By proposed switching functions control inputs are continuous and during the entire control process chattering effects are removed. In addition, responses of the system with this approach have a good performances in the presence of parameter variations and disturbances. Numerical example is discussed as illustration. Finally, for effective position control of trapezoidal type brushless DC motor, a sliding mode based position controller is developed.
채터링 제거를 위한 유도 전동기의 슬라이딩 모드 제어기 설계
郭君平,安鎬均,金星邑 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1
본 논문에서는 유도 전동기의 슬라이딩 모드 제어기가 설계되었다. 슬라이딩 모드 제어기의 단점인 채터링 현상을 제거하기 위해 연속치 제어입력이 제안되었으며 제안된 기법으로 고속 마이크로 프로세서인 DSP를 이용한 유도전동기의 속도제어를 보였다. 슬라이딩 모드하에서의 유도 전동기는 전동기의 각속도가 지정된 궤적을 추종하도록 동작한다. 실험 결과를 통해 제안된 방법의 유용성을 보였다. This paper presents an improved sliding mode controller design for induction motor. In place of the discontinuous control inputs. continuous inputs are proposed in order to remove the undesirable chattering phenomena. which represent major drawbacks of the sliding mode controller. The design strategy is illustrated with a microprocessor based implementation for the velocity control of an induction motor. An induction motor is operated under sliding mode control such that the motor angular velocity follows a predetermined trajectory. The experimental results confirm the validity of the proposed method.
슬라이딩모드를 고려한 상태공간 외란관측기와 비정합 외란에 대한 강인성 향상
곽군평(Gunpyoung Kwak),박승규(Seungkyu Park) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.9
This paper proposes a novel state space disturbance observer (DOB) to improve the robustness against mismatched disturbances. The DOB is developed by using a sliding mode considering the elimination of mismatched disturbances. In the derivation of the novel DOB algorithm, the sliding function and the estimation error are considered together in a Lyapunov candidate function to guarantee the stability of the overall system, including the controller and DOB. The presented DOB can force the states to stay on the sliding surface by satisfying the hitting condition without an additional input requiring the maximum disturbance and sign function. The robust controller in conjunction with the DOB eliminates the effects of mismatched disturbance on the output in a steady-state. The controller structure in this paper is the same as that of the existing DOB-based control system, meaning the robustness improvement comes from the modified DOB algorithm. By contrast, in the existing DOB-based control systems, the control and disturbance estimation are separated in the stability analysis and as such, the DOB cannot contribute to control performance.