A Harmonic Detection Method of UPQC Based on LSL Algorithm in Photovoltaic Microgrids
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A Harmonic Detection Method of UPQC Based on LSL Algorithm in Photovoltaic Microgrids Fuyin Ni1 · Songlin Wo1 · Zhengming Li2 Received: 11 September 2019 / Revised: 19 April 2020 / Accepted: 14 July 2020 © Brazilian Society for Automatics--SBA 2020
Abstract Photovoltaic microgrids have discontinuity and intermittency issues that affect the load current amplitude and frequency, and this leads to disturbances. The unified power quality conditioner (UPQC) combines a series active power filter (SAPF) and a parallel active power filter (PAPF), and therefore, it has the advantages of SAPF and PAPF to treat power quality problems. Considering detection precision and response speed, and to meet the fast speed and accuracy of PAPF harmonic detection, the algorithm principle of adaptation and least-squares lattice (LSL) is analyzed. A new harmonic detection method of three-phase circuit based on LSL adaptive algorithm is proposed. The two other harmonic detection methods between least mean square and instantaneous power theory based are compared using the Simulink simulation platform. The compensation effect of LSL is more stable and better than the two other methods. The experimental results also indicate that the new method based on LSL can accurately detect and compensate the harmonic component in photovoltaic microgrids in real time. Therefore, this harmonic detection method based on LSL can be used in the practical engineering applications, and it provides a new method for harmonic detection of UPQC PAPF. Keywords Unified power quality conditioner · LSL algorithms · Photovoltaic microgrids · Parallel filter
1 Introduction Photovoltaic microgrids are popular owing to their advantages such as minimal pollution and easy installment (Sofla and Gharehpetian 2011). However, the microgrid has a series of power quality problems because power generation is random and different types of electrical equipment workstation are available. All the power quality problems are related to each other; however, currently available power electronic compensation devices can treat one problem at a time. To the best of our knowledge, no device can resolve all problems together. Unified power quality conditioner (UPQC) (Khadkikar 2012) uses a series active power filter (SAPF) and a parallel active power filter (PAPF), and it has the advantages of SAPF and PAPF for dealing with * Fuyin Ni [email protected] 1
School of Electrical and Information Engineering, Jiangsu University of Technology, Changzhou 213001, Jiangsu, China
School of Electrical and Information Engineering, Jiangsu University, Zhengjiang 212013, Jiangsu, China
2
power quality problems. Therefore, it has gained considerable research interest in the power quality treatment field in recent years (Jiang et al. 2014; Trinh and Lee 2014, 2015; Pan and Zhu 2014; Ni et al. 2019; Lü et al. 2015). The PV microgrids with the structure of three-phase three wire present a topology diagram as shown in Fig. 1. UPQC is installed in the distribution system where SAPF is placed at source
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