Back-to-back Converter Control of Grid-connected Wind Turbine to Mitigate Voltage Drop Caused by Faults

TL;DR

This paper investigates a back-to-back converter control strategy for grid-connected wind turbines with PMSG to mitigate voltage drops during faults, ensuring stable power injection and DC link regulation through detailed simulation analysis.

Contribution

It introduces a novel converter control methodology that improves voltage stability during faults in wind turbine systems with PMSG, validated by simulation results.

Findings

Enhanced voltage stability during grid faults

Maintained maximum active power injection

Effective DC link voltage regulation

Abstract

Power electronic converters enable wind turbines, operating at variable speed, to generate electricity more efficiently. Among variable speed operating turbine generators, permanent magnetic synchronous generator (PMSG) has got more attentions due to low cost and maintenance requirements. In addition, the converter in a wind turbine with PMSG decouples the turbine from the power grid, which favors them for grid codes. In this paper, the performance of back-to-back (B2B) converter control of a wind turbine system with PMSG is investigated on a faulty grid. The switching strategy of the grid side converter is designed to improve voltage drop caused by the fault in the grid while the maximum available active power of wind turbine system is injected to the grid and the DC link voltage in the converter is regulated. The methodology of the converter control is elaborated in details and its performance on a sample faulty grid is assessed through simulation.