• Title/Summary/Keyword: High harmonic generation

Search Result 110, Processing Time 0.028 seconds

Harmonics Reduction in Load control and Management system

  • Thueksathit, W.;Tipsuwanporn, V.;Hemawanit, P.;Gulpanich, S.;Srisuwan, K.
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 2003.10a
    • /
    • pp.2283-2286
    • /
    • 2003

  • This paper presents conservation of electrical energy in building with harmonics analysis and compensation which occur in electrical system. We use load controlling and management system in order to adjust load factor of system.The maximum demand limiting and controlling are used ,then the system can acquire the prediction and compare it to the maximum demand set point.The electrical signal analysis based on FFT technique. The harmonics are compensated by using harmonic filters.This system consists computer which works as controller, processor , analysis and database unit together with digital power meter in form of multidrop network through serial communication via RS-485.The load control system uses PLC to control load via serial communication RS-485. The A/D converter is used for sampling the electrical signals via parallel port of computer.The harmonic filters are controlled by a computer.The data of measurement such as voltage, current, power, power factor, total harmonic distortion, energy, etc., can be saved as database and analysis. The load factor is adjusted by limiting and controlling maximum demand. The load factor adjustment can reduce the cost of electric consumption and energy generation together with harmonics compensation in order to increase high efficiency of electrical system.

  • PDF

Single-Phase Active Power Filter for Higher-order Harmonic Current Compensation (고차 고조파 전류의 보상을 위한 단상 능동전력필터)

  • Sung, Ki-Suk;Woo, Myung-Ho;Song, Joong-Ho;Choy, Ick;Lim, Myo-Taeg
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.49 no.7
    • /
    • pp.500-508
    • /
    • 2000

  • Basic design for single-phase active power filter, which aims at railway application provided with PWM-controlled converters, is comprehensively studied and its performance is presented in this paper. Active power filters are used to compensate railway signaling and public telecommunication interference due to the high-order harmonic currents generated in railway traction locomotives. A type of hybrid digital filter which is composed of low pass filter and high pass filter is proposed so that the desired harmonic reference current with accurate magnitude and phase shift can be extracted from catenary line current. A design criteria to determine input inductor L and output capacitor C is also described, considering voltage, current, PWM pattern, and switching frequency of the main converters. Finally, computer simulation and DSP-based experiments resulted from laboratory test are presented.

  • PDF