The Small-Signal Stability of Offshore Wind Power Transmission Inspired by Particle Swarm Optimization

Jiening Li,Xiaoning Chen,Lingxi Peng,Ping Luo,Hanqi Huang,Liang Wang

doi:10.1155/2020/9438285

Abstract

Voltage source converter-high-voltage direct current (VSC-HVDC) is the mainstream technology of the offshore wind power transmission, which has been rapidly developed in recent years. The small-signal stability problem is closely related to offshore wind power grid-connected safety, but the present study is relatively small. This paper established a mathematical model of the doubly fed induction generator (DFIG) integrated into the IEEE9 system via VSC-HVDC in detail, and small-signal stability analysis of offshore wind farm (OWF) grid connection is specially studied under different positions and capacities. By selecting two load nodes and two generator nodes in the system for experiments, the optimal location and capacity of offshore wind power connection are obtained by comparing the four schemes. In order to improve the weak damping of the power system, this paper presents a method to determine the parameters of the power system stabilizer (PSS) based on the particle swarm optimization (PSO) algorithm combined with different inertia weight functions. The optimal position of the controller connected to the grid is obtained from the analysis of modal control theory. The results show that, after joining the PSS control, the system damping ratio significantly increases. Finally, the proposed measures are verified by MATLAB/Simulink simulation. The results show that the system oscillation can be significantly reduced by adding PSS, and the small-signal stability of offshore wind power grid connection can be improved.

Highlights

IntroductionAs a clean and sustainable technology, has been developed rapidly in recent years [1]
Offshore wind power, as a clean and sustainable technology, has been developed rapidly in recent years [1]
Based on the smallsignal stability problem of the offshore wind power system transmitted by VSC-HVDC, the damping control of the system is increased by introducing PID regulation at the converter station. e modeling method does not consider

Summary

Introduction

As a clean and sustainable technology, has been developed rapidly in recent years [1]. There are few studies on the small-signal stability analysis of the offshore wind power grid connected by VSC-HVDC transmission at present. The PSO algorithm will fall into local optimum, and more controller equations increase the dimension of the state matrix, which will slow down the fast operation of the system [20] In these studies, scholars have studied the small-signal stability of offshore wind power grid connection in different fields, it is still in the exploratory stage to change the gridconnected position and capacity of offshore wind farms for small-signal stability analysis and to apply damping control. After deducing the complete small-signal stability model of offshore wind power transmitted by VSC-HVDC, it is necessary to do further research on the influence of smallsignal stability on the system of offshore wind power in different positions and capacities.

Control Measures

Conclusions