Coordinated Control Schemes of Super-Capacitor and Kinetic Energy of DFIG for System Frequency Support

Liansong Xiong, Yujun Li, Yixin Zhu, Ping Yang and Zhirong Xu
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Liansong Xiong: School of Automation, Nanjing Institute of Technology, Nanjing 211167, China
Yujun Li: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Yixin Zhu: School of Internet of Things Engineering, Jiangnan University, Wuxi 214122, China
Ping Yang: School of Electric Power, South China University of Technology, Guangzhou 510006, China
Zhirong Xu: School of Electric Power, South China University of Technology, Guangzhou 510006, China

Energies, 2018, vol. 11, issue 1, 1-16

Abstract: This paper mainly focuses on how to provide frequency supports by the doubly fed induction generator (DFIG) during system disturbances. Two coordinated controls that enable system frequency supports by DFIG-based wind turbines (WTs) are proposed in this paper. The first control scheme seeks to render system support via simultaneously utilizing the energy from the installed super-capacitor between the back-to-back converter of DFIG, and WT rotational kinetic energy (KE). The second one stabilizes system frequency by firstly exerting the installed super-capacitor energy and then WT rotational KE via a unique cascading control. Both proposed coordinated control schemes jointly utilize two virtual inertia sources, namely super-capacitor in the DFIG and rotor rotational mass in the WT to fast provide system frequency support. However, the second proposed one stands itself out by reducing its impaired impacts on the overall wind energy production. Two proposed controls on rapidly providing frequency support are effectively verified and compared in detail by different system disturbances in the DIgSILENT/Powerfactory software.

Keywords: system inertia support; kinetic energy (KE); doubly fed induction generator (DFIG); cascading control; frequency regulation (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: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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