Maximum Power Tracking Scheme for Wind Energy Conversion System Based on a Composite Control Strategy Under Harmonic Disturbance
Jian Sun, Yueping MoIntroduction:
This study proposes a harmonic suppression strategy and a dynamic performance control strategy, respectively, to address the problems of harmonics and poor dynamic performance existing in current wind power generation systems.
Materials and Methods:
To reduce harmonic disturbance in wind power generation systems, a proportional-augmented quasi-resonant control (PQRC) strategy is incorporated into the current loop for harmonic suppression; to improve the dynamic performance of the system, a speed loop and current loop control strategy based on an enhanced active disturbance rejection control (EADRC) strategy is proposed to achieve better dynamic performance of the system
Results:
The composite control strategy proposed in this paper can effectively suppress harmonics and improve dynamic performance.
Discussion:
The proposed scheme in this paper integrates the EADRC and PQRC strategies. While PQRC can specifically suppress harmonics, EADRC enhances system robustness by real-- time observing and compensating for internal and external disturbances, shortening the speed response time and improving wind energy capture efficiency. The composite control strategy not only ensures steady-state power quality but also optimizes dynamic tracking performance. Without additional hardware costs, it simultaneously solves the problems of poor system stability and low maximum power point tracking (MPPT) accuracy under harmonic disturbance.
Conclusion:
Compared with existing control strategies, the composite control strategy designed in this paper can better suppress current harmonics, improve the dynamic performance of the system, and achieve a superior maximum power point tracking effect.