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The present work discuss the localization and coordinated operation of active power filters installed in a distribution power network. The localization problem is solved off-line for a given load variation scenario. The control of the current injected by the active power filter is solved on-line. In both cases the design solutions aim at reducing the total harmonic distortion below 5% and individual...
Compared to the conventional analog-circuit control and linear power amplifier for permanent-magnet electrodynamic shaker (PMEDS), a DSP-based digital current control with switched-mode power amplifier is proposed in this paper. A full-bridge converter is connected directly to PMEDS without LC filter in order to directly regulate the shaker current and simplify the digital current control. To meet...
Conventional control strategies, used in shunt active power filters (SAPF), employ real-time instantaneous harmonic detection schemes which are usually implemented with digital filters. This increases the number of current sensors on the filter structure which results in high cost. Furthermore, these detection schemes introduce time delays which can deteriorate the harmonic compensation performance...
With the progress of “More Electric Aircraft”, power capacity of aircraft electric power system is increased. It is not easy for the power-quality characteristics of the system to be in compliance with the harmonic standards by using traditional method to compensate the harmonics introduced by the nonlinear load. Active power filter (APF) gets increasing usage in 50Hz power system for its high performance...
This paper presents design and implementation of a Shunt Active Filters (SAF) for aircrafts power networks using an accurate wide-band current control method based on Iterative Learning Control (ILC). The SAF control system is designed to compensate harmonic currents, within a 400 Hz supply voltage. This work introduces useful design strategies to increase the error-decay speed and improve the robustness...
Acoustic resonance has been an important problem in high pressure discharge lamp supplies at high frequency due to its undesirable effects such as arc distortion, fluctuation, lamp life reduction, discharge extinction and lamp destruction in the most severe cases. Our method for the injection of adjacent signals allows the restriction of certain selected power harmonics in the lamp in order to avoid...
Shunt Active Power Filters (APFs) are suitable to compensate current-type harmonics generated by nonlinear load, but large power and high compensation precision is difficult to be obtained due to low switching frequency of high power switch devices e.g. IGBTs and phase lag of digital control loop. In this paper, a high equivalent switching frequency is obtained in spite of low real switching frequency...
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