Abstract
Active Power Filters (APFs) have been used for reducing waveform distortion and improving power quality. However, this function can be improved by means of a selective harmonic compensation. Since an APF has rating restrictions, it is convenient to have the option of selecting an individual or a set of particular harmonics in order to compensate and apply the total APF capabilities to eliminate these harmonics, in particular those with a greater impact on the Total Harmonic Distortion (THD). This paper presents the development of a new APF prototype based on a three-phase three-level Neutral Point Clamped (NPC) inverter with selective harmonic compensation capabilities and reactive power compensation. The selective harmonic compensation approach uses several Synchronous Rotating Frames (SRF), to detect and control individual or a set of harmonics using d and q variables. The APF includes a Three-Dimensional Space Vector Modulator (3D-SVPWM) in order to generate the compensation currents. Because of its multilevel topology, the proposed active power filter can be used in diverse power quality applications at sub-transmission and distribution voltage levels. Simulation and experimental results are shown to validate the proposed solution and assess the prototype performance in different scenarios.
Highlights
Harmonic currents produced by power electronic devices and nonlinear loads reduce power quality, leading to diverse problems like increases in power losses, excessive heating in rotating machinery, electromagnetic interference in communication systems, low power factor and failures in electronic equipment [1,2,3,4,5]
An Active Power Filters (APFs) prototype with selective harmonic compensation was built up, rated 1 kW three-phase combined with a non-linear load based on a three-phase diode rectifier with a controlled resistive load in the DC side of 48 Ω
The control algorithm consisting of the reference compensating current calculation and the proposed controller technique for selective harmonic compensation was implemented in the 32-bit digital signal processing F28335, at a switching frequency of 16 kHz
Summary
Harmonic currents produced by power electronic devices and nonlinear loads reduce power quality, leading to diverse problems like increases in power losses, excessive heating in rotating machinery, electromagnetic interference in communication systems, low power factor and failures in electronic equipment [1,2,3,4,5]. The introduction of Space Vector Pulse Width Modulation (SVPWM) techniques and the use of modern high speed micro-processors became one of the more important developments in three-phase inverters [17] This is due to its undoubted operational advantages over carrier-based techniques, e.g., lower Total Harmonic. Some of their advantages are, e.g., reduced switching-voltage ratings, smaller switching stresses dv/dt and an improved output voltage at lower switching frequencies These characteristics have led to the development of many applications, including dynamic battery systems, where the multilevel topology allows one to generate a wide range of output voltage levels [32], flexible alternating current transmission system (FACTS) for medium voltage applications [33] and diverse applications in renewable energy, in particular wind energy systems [34]. The experimental works for the assessment of the proposed design in an APF prototype are presented
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