Abstract
In the case of high-permeability wind power access power system, the virtual inertia control (VIC) help the variable speed wind turbine (VSWT) release the rotational kinetic energy of the rotor and help the wind power participate in the system frequency regulation. However, there are few literatures that apply the VIC in the transient stability control (TSC) of power system. This paper proposed a VIC strategy of VSWT, which help to prevent new swinging modes. And the complicated swinging modes might lead to the migration of the out-of-step oscillation center. In the out-of-step process of a system, additional active power can be injected into or absorbed from the system by VSWTs under the VIC to reduce the unbalanced power of the system. It inhibits the complex swinging modes and frequencies, thereby inhibiting the migration of the out-of-step oscillation center and helping to maintain system stability. Simulation results of the Western Systems Coordinating Council (WSCC) 9-bus system containing 45% of wind permeability verify the proposed virtual inertial control on inhibiting the migration of the out-of-step oscillation center.
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