Abstract
This paper deals with the use of least mean squares (LMS, NLMS) and recursive least squares (RLS) algorithms for total harmonic distortion (THD) reduction using shunt active power filter (SAPF) control. The article presents a pilot study necessary for the construction of our own controlled adaptive modular inverter. The objective of the study is to find an optimal algorithm for the implementation. The introduction contains a survey of the literature and summarizes contemporary methods. According to this research, only adaptive filtration fulfills our requirements (adaptability, real-time processing, etc.). The primary benefit of the paper is the study of the efficiency of two basic approaches to adaptation ((N)LMS and RLS) in the application area of SAPF control. The study examines the impact of parameter settings (filter length, convergence constant, forgetting factor) on THD, signal-to-noise ratio (SNR), root mean square error (RMSE), percentage root mean square difference (PRD), speed, and stability. The experiments are realized with real current and voltage recordings (consumer electronics such as PC source without power factor correction (PFC), HI-FI amplifier, etc.), which contain fast dynamic transient phenomena. The realized model takes into account a delay caused by digital signal processing (DSP) (the implementation of algorithms on field programmable gate array (FPGA), approximately 1–5 μs) and a delay caused by the reaction time of the proper inverter (approximately 100 μs). The pilot study clearly showed that the RLS algorithm is the most suitable for the implementation of an adaptive modular inverter because it achieved the best results for all analyzed parameters.
Highlights
This paper deals with the topic of shunt active power filter (SAPF) control [1,2,3,4]
The realized model takes into account a delay caused by digital signal processing (DSP) (the implementation of algorithms on field programmable gate array (FPGA), approximately 1–5 μs) and a delay caused by the reaction time of the proper inverter
The control methods in the time domain can be separated according to a calculation of the compensation quantities using techniques working with the instantaneous powers in the power grid: p-q, unity power factor (UPF), perfect harmonic cancellation (PHC), and the synchronous detection method (SDM), or with the components of the instantaneous current values: synchronous reference frame (SRF), Id-Iq [49]
Summary
This paper deals with the topic of shunt active power filter (SAPF) control [1,2,3,4]. SAPFs are specially controlled voltage or current inverters, and they have to contain a very powerful computing unit that is able to react to the presence of higher harmonics immediately and reliably compensate these higher harmonics and reactive powers in the network. Contemporary industrial enterprises usually have several types of electric equipment and loads, which can be separated into linear (heating, lamps, active loads, AC machine) and nonlinear (inverters, uninterruptible power supply (UPS) or LED lighting systems). Energies 2019, 12, 1545 source of negative effects on voltage quality in electricity distribution systems. These effects include the strain on the electric network from higher harmonics and reactive power
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