Effectiveness of B2BC-based SGSC–PGSC and NSC-based SGSC–PGSC in a DFIG-based Grid-connected WT System – A Comparative Study

ABSTRACT

This paper presents the doubly fed induction generator (DFIG)-based wind turbine (WT) system with a back-to-back converter (B2BC) and nine-switch converter (NSC) as well as their control schemes. A new slip speed estimator-based control method is also proposed to control RSC of the DFIG-WT system. The system responses are obtained using two different converter topologies, namely (i) B2BC and (ii) NSC-based series grid-side converter (SGSC)–parallel grid-side converter (PGSC) under unbalanced/balanced grid disturbances due to balanced/unbalanced non-linear loads. Their responses are also compared to study the effectiveness of both the converter topologies. Moreover, the system responses are also obtained with the proposed slip speed estimator-based control scheme under varying wind velocity and compared with that of obtained using one of the existing control schemes. The system is modeled in MATLAB/Simulink platform. The time-domain simulation results are presented and analyzed in details. Results show that the B2BC- used with DFIG-WT system can be replaced by NSC under any loading condition and also the proposed slip speed estimator can offer good performance under varying wind velocity.

Keywords:

• B2BC
• DFIG
• NSC
• PGSC
• SGSC
• Slip speed estimator
• Selective harmonic compensation
• WT

Additional information

Notes on contributors

Subir Datta

Subir Datta received his BTech degree from NERIST, India, in 2008; MTech and PhD degrees from NIT Silchar, India, in 2010 and 2017, respectively. He is currently an assistant professor in theDepartment of Electrical Engineering, Mizoram University, India. His research interests include FACTS, electric machine and drives, renewable energy and power electronics.

Jyoti Prakash Mishra

Jyoti Prakash Mishra received his bachelor's degree fromIE, India, in 1996;MTech degree from SEES, DAVV, Indore, India in 1999 and PhD degree from IIT Roorkee, India, in 2010. He is currently an associate professor in the Department Electrical Engineering, NIT Silchar, India. His research interests include power electronic control inelectric power and energy systems; powerquality and management in renewable-based generation and distribution; microgrid control. Email: [email protected]

Anjan Kumar Roy

Anjan Kr Roy received his PhD degree from the IIT Kharagpur, India, in 1991. He was with the NIT Silchar, India, where he was a professor in the Department of Electrical Engineering. His research interests include power and energy system, electric machine & drives, FACTS, AGC and power electronics. Email: [email protected]