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電壓源 인버터를 制御하기 위한 SHE PWM의 最適 스위칭 패턴
鄭東和 순천대학교 공업기술연구소 1989 工業技術硏究所論文集 Vol.3 No.-
本 硏究는 SHE(Selected Harmonic Elimination) PWM(Pulse Width Modulation)의 正確한 最適 스위칭패턴의 한 方式으로 CV(Constant Voltage)에서 HEB(Harmonic Elimination Band)를 定하여 이 HEB에 속하는 모든 解를 구한 다음, 이 解에 해당하는 GKF(Generalized Klirr Factor)를 計算하여 GKF가 最小가 되는 最適 스위칭패턴을 決定하였다. 이와같이 計算된 最適 스위칭패턴의 解를 NR(Newton―Raphson)法의 初期條件으로 하여 VV(Variable Voltage)의 스위칭패턴을 容易하게 決定할 수 있도록 하였다. 이러한 理論的 提案의 妥當性을 立證하기 위하여 PTR(Power Transistor)로 構成된 인버터를 設計하여 誘專電動機를 可變速 運轉시켜 보았으며 이 때 나타나는 結果들을 比較, 分析하여 提示하였다. This paper is proposed one method of the exat optimal switching patterm of Selected Harmonic Elimination (SHE) Pulse Width Modulation (PWM). It defined Harmonic Elimination Band (HEB) in Constant Voltage (CV) and sought all solutions which are included HEB. Then, it calculated Generalized Klirr Factor (GKF) belong to this solution and decided optimal switching pattern is minimized this GKF. This optimal switching solution is used as initial condition of Newton Raphson (NR) method to decided easily switching pattern at Variable Voltage (VV) To verify the validity of this theoretical proposition, It is designed inverter by power Transistor(PTR) and is implemented Variable Speed Drive (VSD) of Induction Motor (IM). This paper is proposed results which is comparison and analysis.
鄭東和 順天大學校 1999 論文集 Vol.18 No.1
This Paper presents the study and implemintation of fuzzy speed controller used in a scalar control of a CRPWM induction motor drive. In particular in the paper a new approach for an easier design and less time consuming tunning process of the fuzzy controller is presented in order to obtain the desired value for the response time with minimal overshoot and to improve the steady state performance. The fuzzy controller is constructed only upon the knowledge of the motor behaviour and the desidered speed response and provides fast and load disturbances. The simulation results show an improved dynamic and steady state behaviour of the proposed controller and its robustness as compared to a convention PI controller.
유도전동기의 파라미터 보상을 위한 적응조정 Field Orientation
鄭東和 順天大學校 1993 論文集 Vol.12 No.1
A rotor flux error-based approach for correcting the rotor time constant estimation used in the slip frequency calculator of indirect field oriented controller is presented in this paper. The controller was derived from the d-q induction motor model. Slip gain is depentent on the motor parameter errors. Thus error between them is used for the estimation of rotor time constant. Simulation results which demonstrate the performance of this approach are presented.