Combined Control by ADRC and DSOGI-FLL of a PMSG Inverter Connected to Grid in Voltage Dip
摘要
The control of a wind system based on a Permanent Magnet Synchronous Generator PMSG connected to grid by PI regulators is insufficient to eliminate internal uncertainties and external disturbances of the system. Additionally, regulating grid voltage and frequency during voltage dips requires robust control to match the needs of grid codes. The Active Disturbance Rejection Control ADRC is applied to control the inverter of our system; its composition is based on the Extended State Observer ESO, which is the most important part. Moreover, to improve the operating performance of the system and its ability to withstand symmetrical and asymmetrical voltage dips while respecting grid codes, we combined with ADRC a frequency-locked loop based on a second order-generalized integrator (DSOGI-FLL). To confirm the effectiveness of the suggested control strategies, we performed a series of simulations in the Matlab/Simulink environment. The results obtained highlighted the superiority of the proposed methods as well as their ability to maintain their performance in the face of symmetrical and asymmetrical voltage dips.