PMSM low voltage ride through based on Coordinated Control Strategy

Zhang Zhaopeng,Suo Dongnan,L Wang,V Yepes

doi:10.1051/e3sconf/202124802005

Abstract

Based on the analysis of the operation characteristics of the fault of direct-drive permanent magnet wind turbine and the existing protection strategies, in order to improve the low-voltage operation capability of direct-drive permanent magnet wind turbine, a new coordinated control strategy for low-voltage crossing is proposed in this paper, which includes DC brake system control of unloading circuit, double second-order generalized integral phase-locked control, extracting positive and negative sequence of grid voltage and reactive power control on grid side. Based on the common three-phase symmetrical drop fault and asymmetrical fault caused by single grounding short circuit in power grid, PASCAD simulation experiment is conducted to verify the low voltage traversing ability of wind turbine.

Highlights

At present, instantaneous voltage sag faults of wind power node account for a large proportion of wind power engineering faults[1]
If the grid voltage sag occurs and the wind generator is automatically trawled without control, it will lead to a large area of power failure and even the risk of local grid failure[2]
Countries have put forward very strict fault crossing standards.When the power grid voltage falls, the system is required to operate without going off the grid

Summary

Introduction

Instantaneous voltage sag faults of wind power node account for a large proportion of wind power engineering faults[1]. Countries have put forward very strict fault crossing standards.When the power grid voltage falls, the system is required to operate without going off the grid. The purpose of this paper is to make reasonable use of the advantages of permanent magnet synchronous wind turbine, and design a low voltage crossing scheme that can ensure the continuous network operation of PMSG, which make an accurate and rapid response when the grid voltage drops. The research on PMSG low voltage crossing technology is of great significance, which can promote the large-scale development of wind power and improve the operation performance of wind power networking[4]

Control Strategy of DC Braking System Based on Unloading Circuit

Phase lock and positive and negative sequence voltage extraction

Reactive power compensation control of grid side converter

Simulation analysis of optimized low voltage traverse control strategy

Findings

Conclusion