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Tan Luong Van,Trong Huan Nguyen,Nhut Minh Ho,Xuan Nam Doan,Thanh Hai Nguyen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a control strategy of the voltage compensation based on a nine switch converter (NSC) to enhance a low-voltage ride-through (LVRT) capability for a doubly fed induction generator (DFIG) wind turbine system. The nine switch converter connected to a stator-side of the DFIG can enable to compensate the voltage response of the system during the grid faults. For series voltage source converter (VSC), a control algorithm consisting of dual voltage controllers is implemented for the two sequence components in the dq synchronous reference frame. As for shunt voltage source converter (VSC), a control algorithm is carried out in the dq reference frame and incorporates both an inner current control loop and an outer voltage control loop. The effectiveness of the proposed methods is verified by the simulation results for the 2 [MW]-DFIG wind turbine system under unbalanced grid voltage conditions.
Flicker Suppression Scheme for Variable-Speed Wind Turbine Systems
Tan Luong Van,Thanh Hai Nguyen,Dong-Choon Lee 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.2
This paper proposes a strategy of flicker mitigation for doubly-fed induction generator (DFIG) wind turbine systems. In the weak grid system where the grid impedance ratio is low, the reactive power compensation only cannot suppress the flicker sufficiently due to the limited power capacity of the converters or the DFIG. For the full suppression of flickers, the active power smoothening using the energy storage system (ESS) needs to be utilized together with the reactive power compensation. The effectiveness of the proposed method is verified by PSCAD/EMTDC simulation results for a 2[MW] DFIG wind turbine system and by experimental results for a 3[kW] wind turbine simulator.
Developing Function Models of Back-to-Back PWM Converters for Simplified Simulation
Tan Luong Van,Dong-Choon Lee 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.1
In this paper, a function model of back-to-back PWM converters, based on the switching function, is developed for simplified simulation of power electronic application systems. For the function model, the PWM power switches are represented by dependent power sources. By using the proposed function model, the computer memory and the run time required for the simulation of power circuits can be significantly reduced. It is shown that the simulation results generated from the function models are almost the same as the ones obtained by using the switching power device model.
Advanced Pitch Angle Control Based on Fuzzy Logic for Variable-Speed Wind Turbine Systems
Tan Luong Van,Thanh Hai Nguyen,Dong-Choon Lee IEEE 2015 IEEE transactions on energy conversion Vol.30 No.2
<P>In this paper, an advanced pitch angle control strategy based on the fuzzy logic is proposed for the variable-speed wind turbine systems, in which the generator output power and speed are used as control input variables for the fuzzy logic controller (FLC). The pitch angle reference is produced by the FLC, which can compensate for the nonlinear characteristic of the pitch angle to the wind speed. With the control variables of the generator output power and speed, the wind turbine is smoothly controlled to maintain the aerodynamic power and its speed at the rated values without any fluctuation in the output power and speed in the high-wind-speed regions. The effectiveness of the proposed method is verified by simulation results for a 2-MW permanent-magnet synchronous generator (PMSG) wind turbine system, and experimental results for a reduced-scale PMSG wind turbine simulator.</P>
Flicker Suppression Scheme for Variable-Speed Wind Turbine Systems
Van, Tan Luong,Nguyen, Thanh Hai,Lee, Dong-Choon The Korean Institute of Power Electronics 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.2
This paper proposes a strategy of flicker mitigation for doubly-fed induction generator (DFIG) wind turbine systems. In the weak grid system where the grid impedance ratio is low, the reactive power compensation only cannot suppress the flicker sufficiently due to the limited power capacity of the converters or the DFIG. For the full suppression of flickers, the active power smoothening using the energy storage system (ESS) needs to be utilized together with the reactive power compensation. The effectiveness of the proposed method is verified by PSCAD/EMTDC simulation results for a 2[MW] DFIG wind turbine system and by experimental results for a 3[kW] wind turbine simulator.
Three-Phase Four-Leg Quasi-Z-source Inverter with Constant Common-Mode Voltage
Van Tan Luong 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4
This article proposes a three-phase two-level quasi-Z-source inverter based on the four-leg structure to provide the constant common-mode voltage. The proposed four-leg inverter can solve the amplitude of high-order harmonics of common-mode voltage when the shoot-through states are used to achieve the boosting voltage ratio and improve the reliability of the inverter. The operating principle, mathematical analyses, and control method of the proposed four-leg inverter are presented. A comparison study of the proposed four-leg structures for constant common-mode voltage is also discussed. Finally, simulation and experimental results have been presented based on a 1 kW prototype inverter to confi rm the theory of the proposed four-leg inverter.
Simplified Function Model of Back-to-Back PWM Converters for DFIG Wind Turbine Systems
Tan Luong Van,Dong-Choon Lee 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
Power electronic converters can be analyzed by means of commonly used simulation software such as PSCAD. However, full model as a set of witches incurs long execution time and possible divergence problem in case of complicated circuits. This paper proposes the equivalent circuit model for power converter for DFIG(doubly-fed induction generator) wind turbine system. In the model, the PWM power switches are represented by dependent power sources. Computer memory and run times required for simulation of the power circuit can be significantly reduced. The simulation results using function model and power semi-conductor devices are compared.
Developing Function Models of Back-to-Back PWM Converters for Simplified Simulation
Van, Tan Luong,Lee, Dong-Choon The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.1
In this paper, a function model of back-to-back PWM converters, based on the switching function, is developed for simplified simulation of power electronic application systems. For the function model, the PWM power switches are represented by dependent power sources. By using the proposed function model, the computer memory and the run time required for the simulation of power circuits can be significantly reduced. It is shown that the simulation results generated from the function models are almost the same as the ones obtained by using the switching power device model.
Flicker Measurement based on SVR for Fixed-Speed Wind Generator Systems
Tan Luong Van,Dong-Choon Lee 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.2
This paper presents a simulation model based on support vector regression (SVR) for flicker emission estimation from wind turbines. Training patterns are developed by varying the wind speed and network parameters that might affect the expected flicker levels. A comparison is done to the fixed speed wind turbine (WT), which leads to a conclusion that the factors mentioned above have different influences on flicker emission. The simulation results have shown that the flicker estimation is performed accurately.
Thanh Hai Nguyen,Tan Luong Van,Dong-Choon Lee,Joo-Hong Park,Joon-Hyeon Hwang 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.6
This paper proposes a control mode switching scheme between vector control and constant V/ f control for induction machine (IM) drives for maximum torque utilization in a higher speed region. For the constant V/ f scheme, a smooth transition method from the linear range of PWM up to the six-step mode is applied, by which the machine flux and torque can be kept constant in a high-speed range. Also, a careful consideration of the initial phase angle of the voltage in the transient state of the control mode change between the vector control and V/ f schemes is described. The validity of the proposed strategy is verified by the experiment result for a 3-kW induction motor drives.