An effective system control method is presented for applying a
three-phase current-source PWM convertor with a deadbeat controller to
active power filters (APFs). In the shunt-type configuration, the APF is
controlled such that the current drawn by the APF from the utility is
equal to the current harmonics and reactive current required for the
load. To attain the time-optimal response of the APF supply current, a
two-dimensional deadbeat control scheme is applied to APF current
control. To cancel both the delay in the two-dimensional deadbeat
control scheme and the delay in DSP control strategy, an adaptive line
enhancer (ALE) is introduced in order to predict the desired value of
three sampling periods ahead. The ALE also brings robustness to the
deadbeat control system. Owing to the ALE being in a transient state,
the settling time is short. By comparison in a steady state, the total
harmonic distortion ratio of source currents can be reduced as much as
possible compared to the case that ideal identification of a controlled
system could be made. The experimental results obtained from a DSP-based
APE are also reported. The compensating ability of this APF is very high
in accuracy and responsiveness, although the modulation frequency is
"In the conventional digital dead-beat control schemes, the regulator calculates the phase voltage to make the phase current reach its reference by the end of the following modulation period. In this Control, a modified Method Based on Dead-Beat controller is used (MBDB) . The purpose of this method is to compute directly the time period when a switching device is turned on in order to make the phase current reaches its reference by the end of the following modulation period. "
[Show abstract][Hide abstract] ABSTRACT: In modern era, the tradition of non-linear loads in Electrical power system has sparked the research in power quality (PQ) concern like voltage flicker, voltage sag and swell, harmonics, etc., Among all the other concerns, one of the the majority significant of PQ problem is Harmonics. Active Power Filter (APF) is one of most challenging filter for the mitigation of harmonics. The heart of the Active power Filter is the controller part. In this study, a wide-ranging review of various controllers have been projected, Which mitigate harmonics, reactive power and unbalanced load currents originating from load side, and also the advantages and disadvantages of presented techniques are presented. The study also helps the researchers to select the optimum control strategies and power circuit configuration for APF applications. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of ICCTSD 2011
"La corriente de referencia se compone de las componentes que se pretenden eliminar de la corriente de la carga, las cuales deben ser inyectadas en contrafase en el punto de conexión común y, además, esta corriente incluye una pequeña componente de corriente activa para mantener la tensión de continua o, lo que es lo mismo, para restituir las pérdidas del filtro  y mantener su capacidad de compensación. Las prestaciones del filtro dependen en gran medida del método empleado para obtener la corriente de referencia en tiempo real. "
[Show abstract][Hide abstract] ABSTRACT: Non-linear electrical loads connected to power systems introduce non-active power components. The current harmonics and reactive power deteriorate the power quality and reduce the electrical system efficiency. These non-desirable effects can be avoided by using shunt active power filtering. This is a relevant topic in electrical and power electronics systems and, as a consequence, it must be included in undergraduate engineering courses. The aim of this paper is to present a laboratory set-up of a three-phase three-wire shunt active power filter (SAPF) which allows undergraduate and postgraduate engineering students to evaluate experimentally the performance of different control algorithms in SAPFs. As an example a complete didactic application is described using the developed laboratory set-up.
"For this purpose , artificial neural networks and deadbeat control have been applied to the compensation schemes to reduce the delay time. However, a neutral network requires a learning process in advance  and deadbeat control is subject to system parameter perturbation . "
[Show abstract][Hide abstract] ABSTRACT: In this paper, a novel control scheme compensating for source voltage unbalance and current harmonics in series-type active power filter systems combined with shunt passive filters is proposed, which focuses on reducing the delay time effect required to generate the reference voltage. Using digital all-pass filters, the positive voltage sequence component out of the unbalanced source voltage is derived. The all-pass filter can give a desired phase shift and no magnitude reduction, unlike conventional low-or high-pass filters. Based on this positive-sequence component, the source phase angle and the reference voltage for compensation are derived. This method is easier to implement and to tune controller gains. In order to reduce the delay time effect in the voltage control loop, the reference voltage is predicted a sampling period ahead. The validity of the proposed control scheme has been verified by experimental results.
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