Control Strategies of PMSG Wind Energy Conversion System Based on Five Level NPC Converter

Abstract

This paper presents a control for a Wind Farm System (WFS) based Permanent Magnet Synchronous Generator (PMSG) and Five Level Neutral Point Clamped converter (FL-NPC). Each wind turbine is equipped with a 2 MW-PMSG and an ac-dc converter. Only one dc-ac FL-NPC converts the dc-bus voltage to an appropriate ac voltage of WFS ac-bus. This paper adopts the Sliding Mode Approch (SMA) and the Vector Control Technique (VCT) to achieve the Maximum Power Tracking (MPT), the stable dc-link voltage, the control of active and reactive powers and the electrical network connection with a unity power factor. To evaluate the controller system abilities, simulation analyses are presented on a wind farm system with five PMSG connected to a grid with FL-NPC and under different operating conditions. The results demonstrate that the proposed techniques are capable to provide excellent control performances.