Abstract:
Wind power systems that successfully link to the grid face severe grid voltage sags. DC bus voltage and output power fluctuate under uneven grid voltage. Additionally, voltage sags will raise peak current, which could endanger wind power system operation.
Detailed examination of high peak current leads to a simple current limiting control system without additional equipment in this paper. The machine side converter (MSC) controller modulates electromagnetic power based on grid side converter (GSC) power.
It converts imbalanced dc-link power into rotor kinetic energy to prevent overvoltage. The GSC controller supports reactive power for the grid and keeps three-phase inverter currents within converter safety limits.
Additionally, the GSC controller can prevent dc bus voltage and output power variations. Simulations under different imbalanced voltages have shown that the suggested technique is feasible and better than standard control schemes.
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