37a - USING ACTIVE POWER FILTERS TO IMPROVE POWER QUALITY...

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USING ACTIVE POWER FILTERS TO IMPROVE POWER QUALITY Luis A. Morán (1) Juan W. Dixon (2) José R. Espinoza (1) Rogel R. Wallace (1) (1) Departamento de Ing. Eléctrica (2) Departamento de Ing. Eléctrica Universidad de Concepción Universidad Católica de Chile Concepción - CHILE Santiago - Chile [email protected] [email protected] Abstract. This paper describes different power quality problems in distribution systems and their solutions with power electronics based equipment. Shunt, hybrid and series active power filters are described showing their compensation characteristics and principles of operation. Different power circuits topologies and control scheme for each type of active power filter are analyzed. The compensation characteristics of each topology with the respective control scheme are proved by simulation and experimentally. I. - INTRODUCTION The proliferation of microelectronics processors in a wide range of equipments, from home VCRs and digital clocks to automated industrial assembly lines and hospital diagnostics systems, has increased the vulnerability of such equipment to power quality problems [1]. These problems include a variety of electrical disturbances, which may originate in several ways and have different effects on various kinds of sensitive loads. What were once considered minor variations in power, usually unnoticed in the operation of conventional equipment, may now bring whole factories to standstill. As a result of this vulnerability, increasing numbers of industrial and commercial facilities are trying to protect themselves by investing in more sophisticate equipment to improve power quality [2]. Moreover, the proliferation of non- linear loads with large rated power has increased the contamination level in voltages and currents waveforms, forcing to improve the compensation characteristics required to satisfy more stringent harmonics standard [3], [4]. Between the different technical options available to improve power quality, active power filters have proved to be an important alternative to compensate for current and voltage disturbances in power distribution systems [5], [6], [7]. Different active power filters topologies have been presented in the technical literature, [8] [9] and many of them are already available in the market [1], [2]. This paper will focus in the analysis of which to use with their compensation characteristics. Shunt active power filters, series active topologies, and hybrid schemes will be presented and analyzed. The control scheme characteristics for shunt and series schemes will also be discussed. Finally, steady state and transient results for dynamic compensation, obtained from simulated and experimental setup will be presented. II. - POWER QUALITY IN POWER
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37a - USING ACTIVE POWER FILTERS TO IMPROVE POWER QUALITY...

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