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Phase locked loop (PLL) algorithms are commonly used to track sinusoidal components in currents and voltage signals in three phase power systems. Despite the simplicity of those algorithms some drawbacks arise when signals have variable amplitude or are polluted with relevant harmonic content and measurement noise. These are typical conditions in aircraft AC power systems, where the fundamental frequency...
The proposed increase of power electronic subsystems for More Electrical Aircraft (MEA) brings severe challenges to aircraft power distribution. Current aircraft power systems work at a fundamental frequency of 400 Hz while proposed AC MEA power networks for next generation aircrafts will have a fundamental frequency which varies most probably between 360 and 900 Hz. An active shunt filter (ASF) is...
A novel algorithm for fundamental frequency and harmonic components detection is presented in this paper. The technique is based on a real-time implementation of discrete Fourier transform, and it allows fast and accurate estimation of fundamental frequency and harmonics of a distorted signal with variable fundamental frequency. It is suitable for active shunt filter applications, when fast and accurate...
A novel fault identification and location scheme designed for small distribution systems as found on aircraft is presented. Under normal operating conditions, the aircraft power supply contains only a low level of triplen harmonics, resulting from slight mismatches in the distribution of single phase nonlinear loads across the three phases. When cable faults occur, the change of conduction modes of...
This paper investigates an adaptive current controller for active power filters for aeronautic applications, which compensate selected load current harmonics. The attention is focused on the load current harmonic compensation when the fundamental frequency varies over a wide range (typically between 400 Hz and 800 Hz) and the harmonics produced by distorting loads (such as the 5th and the 7th) are...
A five-level active shunt power filter (ASF) structure with a predictive current controller is proposed in this paper for application in aircraft power systems with variable fundamental frequency (ranging from 360 Hz to 800 Hz). The tested ASF is capable of a high bandwidth current control with a low switching frequency being able to effectively track harmonic current reference signals up to 5.6 kHz...
A novel algorithm for fundamental frequency and harmonic components detection is presented in this paper. The technique is based on a real-time implementation of discrete Fourier transform and it allows fast and accurate estimation of fundamental frequency and harmonic amplitudes and phases of a distorted and noisy signal with fluctuating fundamental frequency. It is suitable for active shunt filter...
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