• Title, Summary, Keyword: Single-phase

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A Method to Improve the Performance of Phase-Locked Loop (PLL) for a Single-Phase Inverter Under the Non-Sinusoidal Grid Voltage Conditions (비정현 계통 전압하에서 단상 인버터의 PLL 성능 개선 방법)

  • Khan, Reyyan Ahmad;Ashraf, Muhammad Noman;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • pp.7-8
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    • 2017
  • The Phase-Locked Loop (PLL) is widely used in grid-tie inverter applications to achieve the synchronization between the inverter and the grid. However, its performance is deteriorated when the grid voltage is not pure sinusoidal due to the harmonics and the frequency deviation. Therefore it is important to design a high performance phase-locked loop (PLL) for the single phase inverter applications to guarantee the quality of the inverter output. In this paper a simple method to improve the performance of the PLL for the single phase inverter is proposed. The proposed PLL is able to accurately estimate the fundamental frequency component of the grid voltage even in the presence of harmonic components. In additional its transient response is fast enough to track a change in grid voltage within two cycles of the fundamental frequency. The effectiveness of the proposed PLL is confirmed through the PSIM simulation and experiments.

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A New Control Method for a Single-Phase Hybrid Active Power Filter based on a Rotating Reference Frame

  • Kim, Jin-Sun;Kim, Young-Seok
    • Journal of Power Electronics
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    • v.9 no.5
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    • pp.718-725
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    • 2009
  • To get instantaneous reference data in a single power system with vector space phasors, the instantaneous load current is adopted as a phase and another new signal, which is delayed through filtering by the phase-delay property of a low-pass filter, is used as the secondary phase. Because the two-phases have a different phase, the instantaneous value of the harmonic current can be obtained without a time-delay in calculation. The reference voltage is created by multiplying the coefficient k by the compensation current using the rotating reference frame synchronized with the source-frequency. To verify the validity of the proposed control method, experiments are carried out on a prototype of the single-phase hybrid active power filter system.

Electric Field-Induced Phase Transition Behavior in Tetragonal Pb(Zn1/3Nb2/3)O3-PbTiO3 Single Crystals

  • Jeong, Dae-Yong;Kim, Jin-Sang;Kim, Hyun-Jai;Yoon, Seok-Jin
    • Journal of the Korean Ceramic Society
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    • v.43 no.7
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    • pp.389-392
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    • 2006
  • Electric field-induced phase transition from the tetragonal to rhombohedral phase was investigated for the <111> direction in tetragonal PZN-PT single crystals, which have spontaneous polarization along the <001> direction. From the strain and dielectric data, it was confirmed that the samples followed a tetragonal-orthorhombic-rhombohedral phase transition sequence with application of an electric field. This transition is different from the rhombohedral-tetragonal phase transition of <001> rhombohedral composition single crystals, in which a phase transition occurred without showing the intermediate orthorhombic phase.

Modified RCC MPPT Method for Single-stage Single-phase Grid-connected PV Inverters

  • Boonmee, Chaiyant;Kumsuwan, Yuttana
    • Journal of Power Electronics
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    • v.17 no.5
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    • pp.1338-1348
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    • 2017
  • In this study, a modified ripple correlation control (RCC) maximum-power point-tracking (MPPT) algorithm is proposed for a single-stage single-phase voltage source inverter (VSI) on a grid-connected photovoltaic system (GCPVS). Unlike classic RCC methods, the proposed algorithm does not require high-pass and low-pass filters or the increment of the AC component filter function in the voltage control loop. A simple arithmetic mean function is used to calculate the average value of the photovoltaic (PV) voltage, PV power, and PV voltage ripples for the MPPT of the RCC method. Furthermore, a high-accuracy and high-precision MPPT is achieved. The performance of the proposed algorithm for the single-stage single-phase VSI GCPVS is investigated through simulation and experimental results.

Analysis And Performance Prediction Of Single Phase Induction Machine Due To Changes Of Shaded-Pole Angles (단상유도전동기구에서 Shaded-Pole각이 동작특성에 미치는 영향)

  • 황영문
    • 전기의세계
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    • v.23 no.2
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    • pp.39-45
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    • 1974
  • An analysis is developed for the torque characteristics of single-phase induction motors having variable shaded-pole angles. The machanism have two sets of stator windings which one set of stator fed from single-phase sources and other shorted by inserted external impedances. Thus, by phisically rotating one set of stator windings with respect to the other, the only shaded-kpole effect torque performance of a single- phase induction machine and its performance prediction to be expected of the optimum shaded-pole angle can be achieved.

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Driving Characteristics of Single Phase Switched Reluctance Motor for Fan Application (송풍기용 단상 SRM의 구동특성)

  • Kim B.C.;Ahn J.W.
    • Proceedings of the KIPE Conference
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    • pp.848-851
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    • 2003
  • This paper proposes a new driving scheme for single-phase SRM. The driving scheme is very simple and inexpensive. By use of this scheme, simple power devices based on low switching losses enable to high efficiency SRM drive. Starting, One of the main problem in single-phase SRM is overcame by a new starting algorithm with one hall sensor and a parting magnet. The proposed single phase SRM has a high efficiency and robust drive characteristics compared to that of a universal motor.

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Adaptation of Space Vector Modulation to Single-Phase High Power PWM Converters (단상 PWM 컨버터에 적용한 공간 벡터 PWM)

  • Lee, Hee-Myun;Lee, Dong-Myung
    • Proceedings of the KIPE Conference
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    • pp.442-443
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    • 2011
  • In this paper, a voltage control method based on DQ transformation and Space Vector Pulse Width Modulation (SVPWM) for a single phase three-level converter is proposed. This control method is designed to use DC values instead of using instantaneous values of current which are usually used in single-phase application, so that it results in a fast and robust voltage control response. Simulation results demonstrate the validity of the control strategies.

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Calculation of Winding Inductances for a Single-Phase Brushless DC Machine

  • Joo, Dae-Suk;Woo, Kyung-Il;Kim, Dae-Kyong
    • Journal of Magnetics
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    • v.17 no.3
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    • pp.196-199
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    • 2012
  • This paper presents the analytical calculation of winding inductance for a single-phase brushless DC machine based on the magnetic circuit concept. The machine is used in the low power range of applications, such as ventilation fans, due to its simplicity and low cost. Since flux linkage is proportional to inductance, the calculation of winding inductance is of central importance. By comparison with experimental and analytical values, it is shown that proposed analytical expression is able to effectively predict the winding inductance of single-phase brushless DC machines at the design stage.

Analysis of Phase Error Effects Due to Grid Frequency Variation of SRF-PLL Based on APF

  • Seong, Ui-Seok;Hwang, Seon-Hwan
    • Journal of Power Electronics
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    • v.16 no.1
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    • pp.18-26
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    • 2016
  • This paper proposes a compensation algorithm for reducing a specific ripple component on synchronous reference frame phase locked loop (SRF-PLL) in grid-tied single-phase inverters. In general, SRF-PLL, which is based on all-pass filter to generate virtual voltage, is widely used to estimate the grid phase angle in a single-phase system. In reality, the estimated grid phase angle might be distorted because the phase difference between actual and virtual voltages is not 90 degrees. That is, the phase error is caused by the difference between cut-off frequency of all-pass filter and grid frequency under grid frequency variation. Therefore, the effects on phase angle and output current attributed to the phase error are mathematically analyzed in this paper. In addition, the proportional resonant (PR) controller is adapted to reduce the effects of phase error. The validity of the proposed algorithm is verified through several simulations and experiments.

The design of a torque controller for single phase induction motor using phase angle (위상각제어에 의한 단상유도전동기의 토크제어기설계)

  • Lim, Y.C.;Choi, C.H.;Na, S.H.;Jung, Y.G.;Chang, H.C.;Chang, Y.H.
    • Proceedings of the KIEE Conference
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    • pp.908-911
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    • 1993
  • The single-Phase induction motor is widely used in many light duty applications. especially in home and the office. At present, many applications which use these motor require continuously adjustable speed control. In the general, the speed control of single-phase induction motor is accomplished at a few discrete speeds by using tapped-windings, pole switching or gear. These techniques is inefficient and complicated. In this paper, auxiliary winding voltage phase angle of single-phase induction motor is used to continuously adjust electromagnetic torque. The analysis includes the determination of the relationship between the auauxiliary winding voltage phase angle and torque. Simulation results of the motor's torque-speed characteristics using the controlled auxiliary winding supply are shown and discussed. The drive is tested using a dynamometer to experimentally verify the results of the theory and simulations.

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