Abstract
The increasing number of electronic loads has introduced several harmonics into the power system, leading to a growth in the importance of filters intended for their mitigation. Thus, it is important to have the knowledge to select operational limits of each new filter connected in the power grid. Likewise, obtaining these harmonics requires robust tracking systems that provide enough information for better filter selectivity. This paper proposes a selective harmonic active filter control based on Fourier linear combiner (FLC) algorithms for a three-phase electrical grid. The presented system is enabled to track each harmonic order and sequence components with great robustness, extracting positive, negative, and zero sequence information from each harmonic for further filter selectivity. It also proposes a new strategy to improve the FLC-based algorithms in tracking frequencies in power grid disturbances. Simulated results of the algorithm and a real-time simulation of a selective active power filter (SAPF) were presented, validating the performance in several scenarios.
Highlights
Signal processing applied to the power grid has become an increasingly relevant tool in power electronics applications
The Fourier linear combiner (FLC) is an application of the Least Mean Square (LMS) algorithm to estimate the weights of a Fourier series corresponding to an original periodic signal
The simulation scenarios proposed in this paper were developed to demonstrate the behavior of SDFLC + 3WFLC in the occurrence of several electrical grid disturbances
Summary
Signal processing applied to the power grid has become an increasingly relevant tool in power electronics applications. Among the signal tracking strategies widely applied for synchronization, the most common in the literature are the phase-locked loops based on instantaneous active and reactive power theory (p-q theory) and second order generalized integrator (SOGI) [2,3] These strategies seek robustness and a low response time in the phase tracking of fundamental positive and negative sequence components of a signal. Since the great advantage of this strategy is the intrinsic way of tracking harmonic and fundamental components, there is a possibility to further explore this characteristic, expanding the number of information obtained from the power grid This has already been verified through simulation to act on three-phase systems with high harmonic penetration and as a control for selective filters to mitigate zero sequence components.
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