The Experts below are selected from a list of 115056 Experts worldwide ranked by ideXlab platform

Yutthachai Sillapawicharn - One of the best experts on this subject based on the ideXlab platform.

  • A fast single-phase voltage sag detection for voltage sag Compensation System
    TENCON 2014 - 2014 IEEE Region 10 Conference, 2014
    Co-Authors: Yutthachai Sillapawicharn
    Abstract:

    This paper proposes a fast single-phase voltage sag detection for voltage sag Compensation System. The operation of proposed method is based on synchronously rotating reference frame which provides fast and accurate voltage sag detection. a proposed fast single-phase voltage sag detection uses the differentiator as a (−90)-degree phase shifter to produce an orthogonal AC voltage (Vβ) from existing grid voltage (Vα) and convert these voltages to the DC voltages (Vd, Vq) by using of αβ-dq transformation (Park transformation). Finally the sag signal can be generated by these DC voltages (Vd, Vq). The voltage sag can be recognized by the proposed method in a very short time in every condition of voltage sags. When it is integrated to the voltage sag Compensation System, the voltage sag can be compensated in a very short time due to fast detection and the load voltage is slightly affected from the voltage sag event.

  • An application of improved synchronous reference frame-based voltage sag detection in voltage sag Compensation System
    2013 15th European Conference on Power Electronics and Applications (EPE), 2013
    Co-Authors: Yuttana Kumsuwan, Yutthachai Sillapawicharn
    Abstract:

    This paper proposes an application of improved synchronous reference frame (ISRF)-based voltage sag detection in voltage sag Compensation System. The ISRF-based voltage sag detection presents the fast detection time that is suitable to use in voltage sag Compensation System. The proposed voltage sag Compensation System consists of ISRF-based voltage sag detector, static transfer switches (STSs), and alternative voltage source using the inverter. In a normal incident, the load fed the power from main voltage source via the main STS. When the voltage sag occurs and it is detected by the voltage sag detector, the alternative STS connects the load to an alternative voltage source instead of the main STS. The computer software simulation and the experiment were made to investigate and verify the operation of proposed voltage sag Compensation System. It can be seen from the results that a short voltage sag detection time is obtained and voltage sag can be compensated with the proposed System.

Qian Bo - One of the best experts on this subject based on the ideXlab platform.

  • Research on Overvoltage Protection for the Reactor in a Shunt Capacitance Compensation System
    Journal of Xihua University, 2007
    Co-Authors: Qian Bo
    Abstract:

    Since the shunt capacitance Compensation System was put into use in electrification railroad,serious accidents have repeatedly occurred in the shunt capacitance Compensation System due to reactor burning.Protel software is used to perform factual analysis for shunt capacitance Compensation System in electrification railroad in this paper.The conclusion is drawn that reactor must withstand the overvoltage of 50kV during exchange peak value once the reactor is put into use while when the capacitor is broken,the reactor has to withstand the impacting over-voltage of 91.2 kV.This paper proposes that if one 10kV MOA is paralleled between capacitor and reactor,it is proved that the scheme for reactor over-voltage protection is correct through practical implementation.

Wang Dong - One of the best experts on this subject based on the ideXlab platform.

Chu Xiao-rui - One of the best experts on this subject based on the ideXlab platform.

Meiying Liu - One of the best experts on this subject based on the ideXlab platform.

  • Semi-active drilling drawworks heave Compensation System
    KeAi Communications Co. Ltd., 2013
    Co-Authors: Lumeng Huang, Yanting Zhang, Lei Zhang, Meiying Liu
    Abstract:

    In order to simplify the structure of the ocean drilling heave Compensation System and reduce the energy consumption of active drawworks heave Compensation System, a new type of semi-active drawworks heave Compensation System was designed through structure design, System modeling and internal model PID robust displacement controller design. Then the feasibility of the System was verified by non-linear time domain simulation and experimental study. The structure design realizes decoupling control of heave Compensation and automatic bit feed, reduces energy consumption of the System. The System is simplified to build simulation model by lumped mass method and energy conservation principle. The double control scheme of hook displacement closed loop in the outer loop and motor speed closed loop in the inner loop is put forward, the internal model PID robust displacement controller of outer loop is designed. The steady-state deviation of internal model control is zero when the model is matching or mismatching. The dynamic performance and resisting disturbance capacity of the internal model control is better when the filter time constant is smaller. The Compensation rate is above 90% by simulation and experimental research results, the Compensation effect is good and the System is feasible. Key words: drilling platform, drawworks, heave Compensation, semi-active, System desig