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Maximum Output Power Control for PV Generation System based on Fuzzy Logic Algorithm
G.Abo-Khalil,Dong-Choon Lee,Jul-Ki Seok,Jong-Woo Choi,Heung-Keun Kim 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11
The paper presents implementation of a PV fuzzy logic power tracking controller. Using maximum power point tracker with the intermediate converter can increase the system efficiency by matching the PV system to the load. A new fuzzy MPPT IS proposed, where fuzzy inputs parameters are dP/dI and the last incremental of duty of duty ratio LOD, and the output IS the new incremental value (new δD) according to the maximum power point under various illumination levels.
Ahmed G. Abo-Khalil,Dong-Choon Lee 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
A novel online capacitance estimation method for a DC-link capacitor in a three-phase AC/DC/AC PWM converter is proposed. A controlled AC voltage with a lower frequency than the line frequency is injected into the DC-link voltage, which then causes AC power ripples at the DC output side. By extracting the AC voltage and power components on the DC output side using digital filters, the capacitance can then be calculated using the recursive least squares method. The proposed method can be simply implemented with only software and no additional hardware. Experimental results confirm that the estimation error is less than 0.2%.
Loss Minimization of DFIG for Wind Power Generation
Ahmed G. Abo-Khalil,Hong-Geuk Park,Dong-Choon Lee,Se-Hyun Lee 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
This paper proposes a loss minimization algorithm for doubly-fed induction generator (DFIG) by controlling the stator reactive power. The proposed strategy directly controls the rotor current to achieve the operating point of minimum generator loss and maximum power point tracking. The maximum power is obtained by tracking the q-axis rotor current with generator speed variation and the minimum generator loss is achieved by controlling the d-axis rotor current. Experimental results are shown to verify the validity of the proposed scheme.
Ahmed G. Abo-Khalil,Dong-Choon Lee 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
In this paper, a novel method for wind speed estimation in wind power generation systems is presented. The proposed algorithm is based on estimating the wind speed using Support-Vector-Machines for regression (SVR). The wind speed is estimated using the generator power-speed characteristics as a set of training vectors. SVR is trained off-line to predict a continuos-valued function between the system's inputs and wind speed value. The predicted off-line function as well as the instantaneous generator power and speed are then used to determine the unknown winds speed on-line. The simulation results show that SVR can define the corresponding wind speed rapidly and accurately to determine the optimum generator speed reference for maximum power point tracking.
Synchronization of Wind Power Generation System Using DFIG to Utility Grid
Ahmed G. Abo-Khalil,Dong-Choon Lee 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
This paper presents a grid connection technique of wind power generation system using DFIG(doubly-fed induction generator). The synchronization of output voltage of the DFIG to the grid utility is investigated and the dynamic response at generator starting is studied. Simulation results using PSCAD show smooth synchronization and fast dynamic response.
Maximum Power Point Tracking Controller Connecting PV System to Grid
Ahmed G. Abo-Khalil,Dong-Choon Lee,Jong-Woo Choi,Heung-Geun Kim 전력전자학회 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.3
Photovoltaic (PV) generators have nonlinear V-I characteristics and maximum power points which vary with illumination level and temperature. Using a maximum power point tracker (MPPT) with an intermediate converter can increase the system efficiency by matching the PV systems to the load. This paper presents a maximum power point tracker based on fuzzy logic and a control scheme for a single-phase inverter connected to the utility grid. The fuzzy logic controller (FLC) provides an adaptive nature for system performance. Also the FLC provides excellent features such as fast response, good performance and the ability to change the fuzzy parameters to improve the control system. A single-phase AC-DC inverter is used to connect the PV system to the grid utility and local loads. While a control scheme is implemented to inject the PV output power to the utility grid at unity power factor and reduced harmonic level. The simulation results have shown the effectiveness of the proposed scheme.
Maximum Power Point Tracking Controller Connecting PV System to Grid
Ahmed G. Abo-Khalil,Dong-Choon Lee,Jul-Ki Seok,Jong-Woo Choi,Heung-Geun Kim 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
The photovoltaic generators have a nonlinear V-I characteristics and maximum power points which vary with the illumination level and temperature. Using maximum power point tracker(MPPT) with the intermediate converter can increase the system efficiency by matching the PV systems to the load. This paper presents a maximum power point tracker based on fuzzy logic and a control scheme for a singlephase inverter connected to the utility grid. The fuzzy logic<br/> controller(FLC) provides an adaptive nature for the system performance. Also the FLC provides excellent features such<br/> as fast response, good performance and the ability to change the fuzzy parameters to improve control system. The singlephase dc/ac inverter is used to connect the PV system to the grid utility and local loads, of which control scheme is implemented to inject the PV output power to the utility grid at unity power factor and reduced harmonic level. The simulation results have shown the effectiveness of the proposed scheme.
Wind Turbine Simulator Including Pitch Angle Control, Shaft Torsional Vibration and Tower Effect
Ahmed G. Abo-Khalil,Dong-Choon Lee 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
This paper proposes a modeling of wind turbine simulator which includes the dynamic characteristics such as pitch angle control, torsional vibration, and tower effect. Simulation results using PSCAD are provided to show the wind turbine simulator performance.