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An improved predictive current controller for active shunt power filters is proposed in this work. The algorithm is based on the conventional deadbeat control and introduces a modified approach to compensate for delays incurred through digital implementation of the control, by predicting a system behaviour one and two sample instants in advance with respect to the measurement instant. Compared with...
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...
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...
This paper presents the automated design of resonant controllers for current control of three phase shunt active filters. The design methods employs a Genetic Algorithm (GA) based routine. The resonant control compensator is introduced in order to improve the control accuracy and performance for AC input signals. An accurate harmonic current control for shunt active filters can be achieved using resonant...
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...
This paper introduces an improved predictive control for the control of the current in a three-phase active shunt power filter (ASF). The proposed control system compensates for unavoidable digital controller delays, and provides an accurate prediction of the ASF behaviour in the next sampling period. A "two ahead" current reference prediction is proposed which estimates the filter current...
In this paper an improved predictive control is proposed for the control of the current in a three-phase voltage source converter. The application for this work is an active shunt power filter (ASF). The proposed control system takes into account unavoidable digital controller delays, which make it difficult to predict the ASF behaviour in the next sampling period. A "two ahead" current...
This paper proposes a very accurate harmonic current control for shunt active filters (SAF) using resonant compensators. The resonant control compensator based on sinusoidal internal model principle is introduced into the control system design in order to improve the control accuracy and performance for ac input signal. The proposed current control system is designed to operate with a single dq reference...
A discrete-time predictive current controller, for the application of active power filtering, is designed and analyzed in this paper. A modified algorithm of reference current prediction in the conditions of step change in amplitude and/or frequency is proposed. The theoretical analysis and the validity of the proposed method are verified by simulations. Comparison for the 5th and the 7th harmonic...
This paper proposes an accurate and simple current control for shunt active filters (SAF) based on a P+Resonant compensator used in conjunction with traditional PI control. The proposed current control system is designed to operate with a single dq reference frame, synchronous with the 50 Hz supply voltage, for the compensation of 5th and 7th harmonics. Another major advantage of this strategy is...
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