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Author: search.filters.author.Numsomran, A.Subject: search.filters.subject.PLL

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    A single phase 9-level inverter controlling based on Phase Lock Loop technique
    (2012-12-01)
    Tipsuwanporn, V.
    ;
    Charean, A.
    ;
    Numsomran, A.
    ;
    Phipek, K.
    In this paper is presented the multilevel inverter which is controlled by Phase Lock Loop (PLL) controller in close-loop system. The multilevel inverter was multiplied voltage levels at output. The inner PLL controller was controlled by PI control in order to firing angle of PWM signal. This control scheme is estimated phase and frequency in DQ-transform of PLL controller on time domain. The PLL controllers were locking constant the frequency and voltage of inverter through the signal estimated in DQ-dimension. The proposed methods determine high-precision and accuracy of switching frequency in PLL characteristic based on time domain. Moreover, in this paper represented the 2<sup>nd</sup> order phase lock loop (PLL) analysis methodology. The 2<sup>nd</sup> order phase lock loop demonstrated in transfer function form that is measured and analysis the signal in time domain. The close-loop control was analyzed the fast response and stability in frequency domain which is obviously behavior of Phase Lock Loop (PLL). © 2012 ICROS.
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    A single-phase PWM inverter controlling base on PLL technique
    (2011-01-01)
    Tipsuwanporn, V.
    ;
    Charoen, A.
    ;
    Numsomran, A.
    ;
    Phipek, K.
    In this paper, the control of the output voltage in a PWM inverter is presented. The single-phase PWM inverter is controlled by using a sinusoidal-pulse width modulation (SPWM) technique, its feedback is controlled with a Phase lock loop (PLL) compensator. The proposed intention is improved output voltage and decreased total harmonic distortion (THD) of the inverter, based on Phase-lock technique and detected phase error of output voltage and reference voltage. Moreover, this method can be applied to greater output of the PWM inverter and better reliability and high-accuracy in order to control methods of PLL. © 2011 SICE.