Harmonic estimation using RLS algorithm and elimination with improved current control technique based SAPF in a distribution network |
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| Affiliation: | 1. Dept. of Electrical & Electronics Engineering, NIT Meghalaya, Shillong, Meghalaya, India;2. Dept. of Electrical Engineering, NIT Rourkela, Odisha, India;1. Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China;2. School of Electrical Engineering and Automation, Jiangsu Normal University, Xuzhou 221116, China;3. College of Information and Communication Engineering, Dalian Minzu University, Dalian, Liaoning, 116600, China;1. Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle, Ministry of Education, China;2. School of Electrical Engineering, Southwest Jiaotong University, Chengdu, China;3. School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, China;1. Università degli Studi di Napoli Federico II, Dipartimento di Ingegneria Elettrica e delle Tecnologie dell’Informazione, Via Claudio 21, 80125 Napoli, Italy;2. Università degli Studi di Cassino e del Lazio Meridionale, Dipartimento di Ingegneria Elettrica e dell’Informazione, Via Di Biasio, 03043 Cassino, Italy |
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| Abstract: | This paper presents the application of well known recursive least square (RLS) harmonic estimation technique and its elimination with improved current control technique based shunt active power filter (SAPF) in a distorted power network. The estimation of amplitude and phase angle of fundamental and harmonics is performed using RLS algorithm, known for their simplicity of computation, accuracy and good convergence properties. The estimates are updated recursively as samples of the harmonic signals are received. In order to eliminate harmonics produced by the nonlinear load connected in the distribution network, a three-phase SAPF with modified current control technique is employed. In this paper, based on the analysis and modeling of SAPF with closed-loop control, a feed forward compensation path of load current and a new pulse width modulation (PWM) control scheme is proposed to improve the dynamic performance of the SAPF. In this case the amplitude and phase angle of the converter AC voltage should be adjusted using PWM, thus producing either leading or lagging reactive power. Harmonic contented in the signal is estimated at the point of common coupling (PCC) with and without SAPF. The comparative results of amplitude and phase angle of fundamental and selected harmonics are determined considering installation of SAPF in the distribution network. The system is studied using MATLAB environment to justify the effectiveness of proposed control technique in comparison to the other techniques discussed in the recent literature. |
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| Keywords: | Harmonics estimation Harmonic elimination Recursive least square (RLS) Shunt active power filter (SAPF) Pulse width modulation (PWM) |
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