Adaptive Fuzzy Neuro Controller for Speed Control of Induction Motor

고재섭,정동화 한국조명.전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.7

This paper is proposed the adaptive fuzzy neuro controller(AFNC) for high performance of induction motor drive. The design of this algorithm based on the AFNC that is implemented using fuzzy controller(FC) and neural network(NN). This controller uses fuzzy rule as training patterns of a NN. Also, this controller adjusts the weights between the neurons of NN to minimize the error between the command output and the actual output using the back-propagation method. The control performance of the AFNC is evaluated by analysis in various operating conditions.  The results of analysis prove that the proposed control system has high performance and robustness to parameter variation, and steady-state accuracy and transient response.

A Novel MPPT Control of a Photovoltaic System using an FLC Algorithm

고재섭,정동화 한국조명.전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.11

This paper proposes a novel maximum power point tracking (MPPT) system using a fuzzy logic control (FLC) algorithm for robust in-environment changing. The power available at the output of a photovoltaic (PV) cell continues to change with radiation and temperature because a solar cell exhibits nonlinear current-voltage characteristics. Therefore, the maximum power point (MPP) of PV cells varies with radiation and temperature. The MPPT methods are used in PV systems to make full utilization of the PV array output power, which depends on radiation and temperature. The conventional MPPT control methods such as constant voltage (CV), perturbation and observation (PO) and incremental conductance (IC) have been studied but these methods are problematic in that they fail to take into account the changing environment. The proposed FLC controller is based on the fuzzy control algorithm and facilitates robust control with the environmental changes. Also, the PV systems applied FLC controller is modeled by PSIM and the response characteristics of the FLC method according to environmental variations are analyzed through comparison with the performance of conventional methods. The validity of this controller is shown through response results.

신경회로망을 이용한 IPMSM 드라이브의 STPI 제어기

고재섭,최정식,정동화 대한전자공학회 2007 電子工學會論文誌-SC (System and control) Vol.44 No.2

This paper presents self tuning PI(STPI) controller of IPMSM drive using neural network. In general, PI controller in computer numerically controlled machine process fixed gain. They may perform well under some operating conditions, but not all. To increase the robustness of fixed gain PI controller, STPI controller proposes a new method based neural network. STPI controller is developed to minimize overshoot, rise time and settling time following sudden parameter changes such as speed, load torque and inertia. Also, this paper is proposed speed control of IPMSM using neural network and estimation of speed using artificial neural network(ANN) controller. The back propagation neural network technique is used to provide a real time adaptive estimation of the motor speed. The results on a speed controller of IPMSM are presented to show the effectiveness of the proposed gain tuner. And this controller is better than the fixed gains one in terms of robustness, even under great variations of operating conditions and load disturbance. 본 논문은 신경회로망을 이용한 IPMSM 드라이브의 자기동조 PI 제어기를 제시한다. 일반적으로 수치제어장치 처리는 고정된 이득값을 가진 PI 제어기를 이용한다. 고정된 이득값을 가진 PI 제어기는 어떠한 환경에서는 양호하게 동작할 수 도 있다. 고정된 이득값을 가진 PI 제어기의 강인성을 증가시키기 위하여 신경회로망을 기반으로한 새로운 방법인 STPI 제어기를 제시하였다. STPI 제어기는 속도, 부하토크, 관성과 같은 파라비터가 갑자기 변화하였을대 오버슈트, 상승시간, 안정화시간을 최소화한다. 또한 본 논문에서는 신경회로망을 이용하여 속도를 제어하고 ANN 제어기를 이용하여 속도를 추정한다. 신경회로망의 역전파 알고리즘 기법은 전동기 속도의 실시간 추정을 제시한다. IPMSM의 속도제어의 결과는 이득값 동조의 효용성을 보여준다. 그리고 STPI 제어기는 고정된 이득값을 가진 PI 제어기에 비하여 강인성, 광범위한 운전영역, 부하 왜란등에 대하여 우수한 성능을 나타낸다.

Development of a Novel MPPT Algorithm of PV System Considering Radiation Variation

고재섭,정동화 한국조명.전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.8

This paper proposes a novel maximum power point tracking (MPPT) control algorithm considering radiation to improve efficiency of PV system. The proposed algorithm is composed perturb and observe (PO) method and constant voltage (CV) method. PO method is simple to realize and CV method is possible to tracking MPP with low radiation. Response characteristics of proposed algorithm are compared to conventional MPPT algorithm such as PO method, IC method and CV method with radiation variation. This paper proves the validity of proposed algorithm through the analysis results.

환경조건을 고려한 태양광 발전시스템의 PV 모듈 구성

고재섭,이진국,정다은,정동화 한국조명·전기설비학회 2012 한국조명·전기설비학회 학술대회논문집 Vol.2012 No.10

This paper proposes the PV module configuration of photovoltaic system considering environment condition. When shadow or variation of radiation or electric characteristic change of the solar cell is happened to PV system, serious power loss is occurred. Therefore, this paper proposes the method that equally makes the output power of the PV module by reconfiguration of PV module through the switching considering these environment conditions. A validity of the active module proposed in this paper proves through comparing with performance of conventional PV module.

HBPI 제어기를 이용한 유도전동기의 직접 토크 제어

고재섭,이진국,정다은,정동화 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.7

계통연계형 인버터의 Anti-Islanding을 위한 새로운 알고리즘 개발

고재섭,강성준,장미금,김순영,문주희,이진국,정동화 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.4

NNPI제어기를 이용한 IPMSM 드라이브의 속도제어

고재섭,남수명,최정식,정동화 제어로봇시스템학회 2005 제어로봇시스템학회 국내학술대회 논문집 Vol.2005 No.10

HBPI 제어기를 이용한 태양광 발전의 MPPT 제어

고재섭,이진국,정다은,정동화 한국조명·전기설비학회 2012 한국조명·전기설비학회 학술대회논문집 Vol.2012 No.10

This paper proposes the hybrid proportional integral(HBPI) controller for maximum power point tracking(MPPT) control of photovoltaic system. The conventional constant voltage(CV), perturbation and observation(PO) and incremental conductance(IC) are the method which finding maximum power point(MPP) by the continued self-excitation vibration, and uses the fixed step size. If the fixed step size is a large, the tracking speed of maximum power point is faster, but the tracking accuracy in the steady state is decreased. On the contrary, when the fixed step size is a small, the tracking accuracy is increased and the tracking speed is slower. Therefore, in order to solve these problems, this paper proposes HBPI controller that is adjusted gain of conventional PI control using fuzzy control, and the maximum power point tracks using this controller. The validity of the controller proposed in this paper proves through the results of the comparisons.

PV 시스템의 기생 커패시터를 이용한 단선 고장 위치 검출

고재섭,조석환,김금주,김대경 국제차세대융합기술학회 2021 차세대융합기술학회논문지 Vol.5 No.6

본 논문은 PV 시스템에 발생하는 단선 고장의 위치를 검출하는 방법을 제시한다. PV 시스템은 외부에 설치되기 때문에 설치 조건 및 기후환경에 따라 효율이 크게 좌우된다. PV 모듈의 전압 및 용량이 낮기 때문에 원하는 출력을 얻기 위해 다수의 PV 모듈을 연결하여 사용하며 PV 모듈을 연결하는 케이블, 커넥터의 부식 및 연결 불량 등은 PV 모듈의 단선 고장을 유발하여 PV 시스템의 전력손실을 매우 크게 발생시킨다. 또한 케이블, Junction Box 및 단자대 등에서 발생하는 단선 고장은 육안으로 확인되지 않은 경우가 많아, 고장 발생에서 제거 까지 상당한 시간이 소요된다. 본 논문에서는 PV 모듈에 고주파가 주입될 때 나타내는 기생 커패시터를 이용하여 단선 고장의 위치를 검출하는 방법을 제시한다. 기생 커패시터는 유효 표면적에 비례하며, 연결된 PV 모듈의 수 에 따라 비례적으로 증가하는 특징을 가진다. 본 논문은 단선의 위치에 따라 기생 커패시터를 측정하고 그 값을 비교하여 단선 위치를 검출하며, 시뮬레이션을 통한 결과 분석을 통해 타당성을 입증한다. This paper proposes a method for localization of a disconnection fault in a PV system. PV systems are installed outside, their efficiency greatly depends on the installation conditions and climatic environment. Because the voltage and capacity of PV modules are small, multiple PV modules are connected and used to obtain the demanded output. Corrosion and poor connection of cables and connectors connecting PV modules can cause disconnection failure of PV modules, causes a very large loss. In addition, disconnection failures occurring in cables, junction boxes, and terminal blocks are difficult to observe with the naked eye, so it takes a considerable amount of time from occurrence to removal. This paper presents a method for detecting the location of a disconnection fault using a parasitic capacitor that is indicated when a high frequency is injected into a PV module. The parasitic capacitor is proportional to the effective surface area and has a characteristic that increases proportionally according to the number of connected PV modules. This paper measures the parasitic capacitor according to the position of the disconnection, compares the value to detect the disconnection position, and proves its validity through the analysis of the result through simulation.