Virtual inertia control strategy of doubly-fed induction generator with additional inertia and damping torque

2018 International Conference on New Energy and Future Energy System

Ren, Q.Y.^1 ; Qian, M.H.^2,3 ; Zhu, C.L.^1 ; Zhao, D.W.^2,3 ; Liu, H.M.^1 ; Zhu, L.Z.^2,3 ; Li, G.J.^2,3

College of Energy and Electrical Engineering, Hohai University, Nanjing

211100, China^1

State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems, China Electric Power Research Institute, Beijing, China^2

Jiangsu Engineering Technology Research Center for Energy Storage Conversion and Application, China Electric Power Research Institute, Nanjing, China^3

关键词: Digsilent/powerfactory;    Doubly fed induction generator (DFIG);    Doubly Fed Induction generators (DFIG);    Electromagnetic equations;    Frequency deviation;    Grid-connected converters;    Mechanical equations;    Proportional-derivative controllers;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/188/1/012037/pdf
DOI  :  10.1088/1755-1315/188/1/012037

来源: IOP

【 摘 要 】

Doubly-fed induction generator (DFIG) with dual Pulse-Width Modulation (PWM) converter cannot maintain the active power balance or voltage stability of the power grid self-synchronously because of lacking mechanical inertia and mechanical damping. The virtual synchronous generator (VSG) technology can help solve this problem through simulating the mechanical equation and electromagnetic equation of synchronous generator to control the grid-connected converter. However, under the common first-order virtual inertia link used in the VSG control scheme, while DFIG providing active power support, there exists second frequency dip and the rotor speed recovers slowly, which is not conducive for DFIG to provide continuous and effective virtual inertia support. In order to overcome the drawbacks as well as avoid second frequency dip, this paper puts forward a virtual inertia control strategy of DFIG with additional inertia and damping torque. The additional torque is achieved by proportional-derivative (PD) controller with rotor slip as an input signal. Simulation results on DIgSILENT/powerfactory platform show that the proposed control strategy is effective to reduce frequency deviation and recover the rotor speed faster without second frequency dip phenomenon.