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PV효과를 이용한 전압형 인버어터 전원동기 전압 조정기에 관한 연구
황락훈,Hwang, Lak-Hoon 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.8
본 논문은 PWM(Pulse width Modulation)전압형 인버어터를 사용하여 전원차단 경우나 전압변동 및 부하변동에 의한 출력전류 변화에도 일정한 출력전압을 유지하는 무정전 전원장치에 대해 논하였다. 본 시스템은 전압형 인버어터를 교류전원과 동기시켜 운전하고 정상상태에서는 전원으로부터 운전하고 정상상태에서는 전원으로부터 직류측에 연결된 축전지를 태양전지를 이용한 광기전력효과와 함께 일정전압을 충전하며, 전원의 차단, 전원의 전압변동 및 부하전류의 변화에도 일정한 전압을 유지하도록 하였다. 출력은 PWM방식에 의하여 양호한 파형이 되도록 하고 전원차단과 부하의 상태의 변화 및 전원 전압 변동에도 일정한 전압으로 출력됨을 실험을 통하여 확인할 수 있었다. In this paper represented uninterruptible power sypply(UPS) equipment maintaining constant output voltage, using a pulse width modulation(PWM) voltage fed inverter, as power source disconnection, voltage variation and output current variation with load variation. This system is driven by being synchronized voltage fed inverter and AC source, and in the steady state of power source charge battery connected to DC side with solar cell using a Photovoltaic (PV) that it was so called constant voltage charge. In addition, better output waveform was generated because of PWM(pulse width Modulation) method, and it was Proved to test by experiment maintained constant output voltage regardless of AC source disconnection, load variation, and voltage variation of AC power source.
3상 PWM 전압형 컨버어터의 전류제어기에 의한 고역율 제어에 관한 연구
황락훈(Lak-Hoon Hwang),김종래(Jong-Lae Kim),장병곤(Byong-Gon Jang) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
This paper presents a current control strategy for a 3-phase PWM AC/DC converter. The input current is sinusoidal and an effective power factor is unity, Since the control variables of the 3-phase converter are sinusoidal, the conventional control strategy requires high control gains to achieve zero steady state error. However, the gains are limited because of sampling delay. To solve the problem, the authors propose a new current control scheme of a 3-phase PWM converter which has two special features: One is that a fast response of current is achieved by introducing a converter model In the controller. Another one is that the steady state AC current control error is canceled even if the parameter differences between the converter model and the actual converter exist. Moreover, the steady state current error can be eliminated under low gains by a feedback loop of the fundamental component of current error. The experimental data show the proposed control to be effective.
유도전동기 토오크 및 속도의 속응제어를 위한 벡터제어 시스템에 관한 연구
황락훈(Lak-Hoon Hwang),나승권(Seung-Kwon Na),김주래(Joo-lae Kim),이춘상(Chun-Sang Lee),조문택(Moon-Taek Cho) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
In this paper, Induction motor speed and torque are usually controlled by the fol1owing three ways slip frequency control, vector control and torque constant control. But there have been little analyses on the transient characteristics in these methods.<br/> Furthermore, since the control system is complex and/or has much problems in its implementation and transient characteristics, it is relatively difficult to apply these methods to the rapid response control for the precision machinery in these days.<br/> Accordingly, this thesis presents a nonsymmetrical T-type equivalent circuit instead of a conventional symmetrical T -type equivalent circuit, and suggests that the rapid response control can be done since the transient characteristics are considerably improved m the voltage source in the voltage source inverter control by the analysis of the equivalent circuit. The experiment has shown that the constant speed control is possible for any load variation, and the response of the torque and speed is rapid for any torque variation.
황락훈(Lak-Hoon Hwang),이춘상(Chun-Sang Lee),나승권(Sung-Kyun Na),조문택(Moon-Taek Cho) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
In this paper, a vector control have been achieved by flux distribution into two axis components in d-q plane, It is a set U, V and W axis by output voltage pattern of PWM inverter, a generating flus by its output voltage changed into three axis components,At the induction -motor driving by inverter, it have already detected to fluxlinkage variation quantity and phase angle from input frequency, we proposed a software strategy of flux control algorithm that the flux vector tracing circle locus is decided as actual fluxlinkage trace reference flux,' By control algorithm reference fluxlinkage average toward direction become an axis direction induction motor is controlled flux control of stop or advance by software process<br/> This algorithm is a simplification of control circuit, ability on expressing every control parameter as quantization, compensation of quantization compensation of quantization error, a switching pattern is decided by addition and substraction.
압전변압기를 이용한 CCFL의 PSPICE 모델링에 관한 연구
황락훈(Lak-Hoon Hwang),김주래(Moon-Taek Cho),이상용(Sang-Yong Lee),신양호(Ju-Rae Kim),조문택(yang-ho shin) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
This paper presents a PSPICE circuit model for the simulation of both static and dynamic characteristics of fluorescent lamps. The model can by utilized for an electric ballast simulation with continuous dimming and transient mode simulation such as step dimming Characteristics of a Rosen-type piezoelectric tr ansformer were analyzied by combining an equi valent circuit with piezoelectric equations and the relation between the characteristics and the dimension of the PT was studied.