NDLI: Control strategy of DFIG in hybrid micro-grid using sliding mode frequency controller and observer

Content Provider	IET Digital Library
Author	Fu, Yang Zhang, Hengyi Mi, Yang Huang, Lingling Li, Zhenkun Wang, Jianhui
Abstract	A doubly fed-induction generator (DFIG) has a significant advantage of fast dynamic frequency regulation. However, conventional virtual inertia control (VIC) design only takes frequency into account and may face secondary frequency drop during rotor speed restoration. To solve these problems, the novel decentralised control strategy is proposed for a hybrid micro-grid. Firstly, the load disturbance is considered to enhance control system accuracy, which is estimated by using the state observer based on the dynamic mathematical model. Then, the sliding mode VIC controller is designed by taking advantage of the observed disturbance value and frequency deviation for DFIG output dynamic adjustment according to the conventional frequency control (VIC) model. Furthermore, during DFIG rotor speed restoration, pitch angle control based on the mathematical model is applied for reserve capacity, and a new triggering condition according to the conventional condition is designed, so as to release reserve power at an appropriate time. Finally, the proposed strategy is tested in a typically isolated micro-grid with diesel and DFIG through a simulation and experiment.
Starting Page	2662
Ending Page	2669
Page Count	8
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 11, Jun (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2017.1615
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-03-08
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Asynchronous Generator Asynchronous Machine Control of Electric Power System Control System Analysis Control System Synthesis Decentralised Control Decentralised Control Strategy DFIG Distributed Power Generation Doubly Fed-induction Generator Dynamic Mathematical Model Fast Dynamic Frequency Regulation Frequency Control Hybrid Microgrid Load Disturbance Machine Control Mathematical Analysis Multivariable Control System Observers Pitch Angle Control Power Generation Control Power Generation Fault Power System Economics Power System Managemen Power System Operation Power System Restoration Power System State Estimation Rotor Speed Restoration Rotors Secondary Frequency Drop Sliding Mode Frequency Controller Sliding Mode VIC Controller State Observer Synthesis Method Variable Structure System Virtual Inertia Control Design
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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