Analysis and Suppression for Frequency Oscillation in a Wind-Diesel System

IEEE Access

Zhe Chen¹  Weichun Ge²  Haixin Wang³  Yiming Ma³  Martin Onyeka Okoye³  Junyou Yang³  Yunlu Li³  Jian Dong³  Lijian Yang⁴ 

[1] Department of Energy Technology, Aalborg University, Aalborg, Denmark;Liaoning Province Electric Power Company, Shenyang, China;School of Electrical Engineering, Shenyang University of Technology, Shenyang, China;School of Information Science and Engineering, Shenyang University of Technology, Shenyang, China;

关键词: Frequency oscillation;    fuzzy PI controller;    wind turbine generator (WTG);    variable universe;    wind-diesel system;   

DOI  :  10.1109/ACCESS.2019.2894011

来源: DOAJ

【 摘 要 】

In a wind-diesel system with weak network architecture, many techniques are utilized to enhance its stability. However, the frequency oscillation between the grid-side converter and the diesel generator may be caused by their interactions, and there are only a few studies considering this issue, which is a major challenge for the stability. To tackle this challenge, the cause of frequency oscillation is studied, and an adaptive fuzzy PI controller based on the variable universe is proposed to suppress oscillation in this paper. The control parameter of the wind turbine generator (WTG) converter’s dc-link voltage loop and wind speed has an important influence on the oscillation. Our main idea is to suppress frequency oscillation by the optimizing control parameter. In order to analyze the interaction between WTG and diesel generator, we develop the small-signal models of the wind-diesel generator. Subsequently, the adaptive fuzzy PI controller based on the variable universe is proposed in the dc-link voltage loop to optimize control parameter instead of gain-scheduled PI controller, and its key feature is the innovative use of an extension factor with d-axis current in the output universe. The function of the extension factor is to adapt WTG to different wind speeds. The experimental results demonstrate that the proposed controller can significantly suppress frequency oscillation. The oscillation amplitude of isolated grid frequency is also significantly reduced by up to 0.175 Hz.

【 授权许可】

Unknown