Open Access

ARTICLE

Robust Variable-Pitch Control Design of PMSG Via Perturbation Observer

Yilin Hu¹, Yan Xie², Bo Li^3,*, Yiqiang Jiang¹, Fu Bao¹

1 Department of International Applied Technology, Yibin University, Yibin, 644000, China
2 School of Information and Communication Engineering, Hainan University, Haikou, 570000, China
3 School of Physics and Information Engineering, Zhaotong University, Zhaotong, 657000, China

* Corresponding Author: Bo Li. Email:

(This article belongs to the Special Issue: Wind Energy Development and Utilization)

Energy Engineering 2021, 118(4), 911-929. https://doi.org/10.32604/EE.2021.014759

Received 27 October 2020; Accepted 15 November 2020; Issue published 31 May 2021

Abstract

Wind turbine employs pitch angle control to maintain captured power at its rated value when the wind speed is higher than rated value. This work adopts a perturbation observer based sliding-mode control (POSMC) strategy to realize robust variable-pitch control of permanent magnet synchronous generator (PMSG). POSMC combines system nonlinearities, parametric uncertainties, unmodelled dynamics, and time-varying external disturbances into a perturbation, which aims to estimate the perturbation via a perturbation observer without an accurate system model. Subsequently, sliding mode control (SMC) is designed to completely compensate perturbation estimation in real-time for the sake of achieving a global consistent control performance and improving system robustness under complicated environments. Simulation results indicate that, compared with vector control (VC), feedback linearization control (FLC), and nonlinear adaptive control (NAC), POSMC has the best control performance in ramp wind and random wind and the highest robustness in terms of parameter uncertainty. Specially, the integral absolute error index of of POSMC is only 11.69%, 12.10% and 15.14% of that of VC, FLC and NAC in random wind speed.

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Keywords

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