Stability Analysis of DFIG Grid-Connection System Applying Cooperative Inertia Control

doi:10.12204/j.issn.1000-7229.2021.12.007

Abstract

Abstract:

Doubly-fed induction generators (DFIGs), because of their operating characteristics, lose inertial response ability like synchronous generators, which will weaken the inertial response ability of the power system after the large-scale grid-connection of DFIGs. During system disturbance, it will not be able to maintain the frequency in the allowable range, which will affect the stability of the system with wind power in different degrees. This paper derives the inertia control model of DFIG with stator-flux oriented vector control, and proposes a cooperative control strategy based on virtual inertia control and rotor speed control. Then the paper establishes modules of virtual inertia control and rotor speed control in Matlab/Simulink platform to simulate and analyze the influence of the inertia response of the grid-connected DFIG system under cooperative inertia control and the influence of the control strategy on the inertia support and system frequency. The simulation results show that, under different working conditions, the cooperative inertia control can provide a certain inertia support for the wind power grid-connection system, which can improve the stability of the system while effectively preventing the system frequency from falling deeply. The research results can provide theoretical guidance for actual engineering.

Key words: doubly-fed induction generator (DFIG), virtual inertia control, rotor speed control, inertia support

CLC Number:

TM712

XU Xinyi, WU Jiahui, YAO Lei, ZHANG Qiang. Stability Analysis of DFIG Grid-Connection System Applying Cooperative Inertia Control[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(12): 59-67.

Figures/Tables 14

Fig.1 Modules of rotor speed control

Fig.2 Modules of virtual inertia control

Fig.3 DFIG model based on cooperative inertia control

Fig.4 Simulation model of wind power grid-connection system

Fig.5 The influence of K p T change on the stability of the system

Fig.6 The influence of K i T change on the stability of the system

Fig.7 Step wind speed

Fig.8 Active power output of the system under step wind speed

Fig.9 Active power of the system when single-phase grounded

Fig.10 Active power of the system when two-phase grounded

Fig.11 Active power of the system when phase-to-phase short circuit

Fig.12 Active power of the system when three-phase short circuit

Fig.13 System active power output comparison under different inertia controls

Fig.14 System frequency variation under different inertia controls

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