Using an active resistive damper in hybrid active power filter to avoid resonance over-voltage
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ORIGINAL PAPER
Using an active resistive damper in hybrid active power filter to avoid resonance over-voltage M. Asadi · A. Jalilian
Received: 14 July 2011 / Accepted: 23 September 2012 © Springer-Verlag Berlin Heidelberg 2012
Abstract This paper presents a hybrid active power filter (HAPF) comprising an active resistive damper (ARD). The ARD consists of three resistances connected to the grid through three bi-directional electronic switches (IGBTs). The ARD can rapidly damp over voltages or over currents under resonance conditions, when the active part (inverter) of the HAPF is disconnected from the grid due to electrical or non-electrical failures. To drive the bi-directional electronic switches of the ARD, a control method is presented in this paper. The control method is based on comparison of resonance over voltage magnitude with a reference voltage (voltage protection level) to control the bi-directional electronic switches. Also the magnitude–frequency characteristics and the control method of the HAPF based on source current detection strategy are analyzed in detail in this paper. Performance of the HAPF with and without the ARD is analyzed in this paper and the results are compared with each other. Finally, the simulation results are provided to validate the proposed topology. Keywords Active resistive damper · Hybrid active power filter · Resonance damping · Resonance over voltage · Magnitude–frequency characteristic · d–q control method
M. Asadi (B) Department of Electrical Engineering, Iran University of Science and Technology (IUST), Tehran, Iran e-mail: [email protected] A. Jalilian Department of Electrical Engineering, Center of Excellence for Power System Automation and Operation, Iran University of Science and Technology (IUST), Tehran, Iran e-mail: [email protected]
1 Introduction Non-linear loads, such as uninterruptible power supplies, adjustable speed drives, single-phase and three-phase rectifiers, and etc. are widely used in electrical grids. Harmonic injections of the non-linear loads degrade the power quality of the electrical grids. The harmonic components cause over-heating and over-loading of transformers, decrease of protection system performance, EMI interference and many other problems. Therefore, reduction of the harmonic components is necessary. Limitation of the harmonic injection is defined in standards such as IEEE519, IEC61000-3-2 and EN50160 [1,2]. Using parallel passive filters (PPFs) is the first and the simplest solution for harmonic current reduction. The low cost and high efficiency are the main advantages of the PPFs [2], but some of their drawbacks such as series and parallel resonances, over voltage under no-load or light load conditions, limit their applications. In addition, magnitude– frequency characteristics of the PPFs are dependent on the source impedances [1,3,4]. Another solution is active power filter (APF) but it is costly. Furthermore, it is difficult to construct a large rated current of the APF with rapid current response [1,4]. A combination of the
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