Hybrid PLL Structure for Improvement of the Dynamic Performance of Grid-Connected Converters

authored by

N. Schäkel, A. Neufeld, L. Hofmann

Abstract

Within this paper, an improved PLL structure that combines both synchronous reference frame PLL (SRF-PLL) and decoupled double synchronous reference frame PLL (DDSRF-PLL) is presented. This hybrid DDSRF-PLL (HDDSRF-PLL) improves the positive sequence component tracking and leads to a better current response of the converter during transients compared to DDSRF-PLL. In the HDDSRF-PLL the positive sequence component is estimated by a SRF-PLL. The input signal of the SRF-PLL is reduced by the negative sequence component estimated by a DDSRF-PLL. Thus, the delays associated with sequence separation in positive sequence reference frame are avoided. The dynamic performance of the HDDSRF-PLL is validated with voltage drops caused by symmetrical and unsymmetrical short-circuits. The performance of the HDDSRF-PLL is compared with the performance of the DDSRF-PLL.

Organisation(s)

Electric Power Engineering Section
Institute of Electric Power Systems

Type

Conference contribution

Pages

93-98

No. of pages

6

Publication date

2020

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://ieeexplore.ieee.org/document/9273341 (Access: Closed)