A Novel Strategy Based on Linear Active Disturbance Rejection Control for Harmonic Detection and Compensation in Low Voltage AC Microgrid

Hui Li, Shuang Li, Junwei Lu, Yue Qu and Chenmu Guo
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Hui Li: College of Automation Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Shuang Li: College of Automation Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Junwei Lu: School of Engineering and Built Environment, Griffith University, Gold Coast, QLD 4222, Australia
Yue Qu: College of Automation Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Chenmu Guo: College of Automation Engineering, Shanghai University of Electric Power, Shanghai 200090, China

Energies, 2019, vol. 12, issue 20, 1-24

Abstract: In an AC microgrid, harmonic distortion is mainly caused by power electronic equipment and nonlinear loads. In this paper, linear active disturbance rejection control (LADRC) is used to control the fundamental current at the point of common coupling (PCC). Meanwhile, an active power filter (APF) is added to eliminate the harmonic current generated by the nonlinear loads. The tracking differentiator (TD) in active disturbance rejection control (ADRC) serves as a low-pass filter (LPF) in the harmonic detection algorithm of APF. Compared to traditional harmonic detection algorithms, the improved strategy solves the contradiction between rapidity, accuracy, and overshoot of filtering. LADRC has good performance of disturbance rejection, internal decoupling, and accessible parameters tuning. It can observe the internal uncertainty and external disturbance of the system as the total disturbance through the extended state observer (ESO), and compensate it in time through state feedback to make the system achieve the desired performance. The abilities of resonance suppression for LCL-type filter and internal decoupling of LADRC demonstrates its advantages through frequency domain analysis and simulation. The proposed strategy was simulated in MATLAB/SIMULINK and realized in the experimental hardware platform, and the effectiveness of the proposed strategy is approved.

Keywords: LADRC; TD; harmonic detection and compensation; LPF (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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