Active frequency with a positive feedback anti-islanding method based on a robust PLL algorithm for grid-connected PV PCS

Jong Pil Lee, Byung Duk Min, Tae Jin Kim, Dong Wook Yoo, Ji Yoon Yoo

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

This paper proposes an active frequency with a positive feedback in the d-q frame anti-islanding method suitable for a robust phase-locked loop (PLL) algorithm using the FFT concept. In general, PLL algorithms for grid-connected PV PCS use d-q transformation and controllers to make zero an imaginary part of the transformed voltage vector. In a real grid system, the grid voltage is not ideal. It may be unbalanced, noisy and have many harmonics. For these reasons, the d-q transformed components do not have a pure DC component. The controller tuning of a PLL algorithm is difficult. The proposed PLL algorithm using the FFT concept can use the strong noise cancelation characteristics of a FFT algorithm without a PI controller. Therefore, the proposed PLL algorithm has no gain-tuning of a PI controller, and it is hardly influenced by voltage drops, phase step changes and harmonics. Islanding prediction is a necessary feature of inverter-based photovoltaic (PV) systems in order to meet the stringent standard requirements for interconnection with an electrical grid. Both passive and active anti-islanding methods exist. Typically, active methods modify a given parameter, which also affects the shape and quality of the grid injected current. In this paper, the active anti-islanding algorithm for a grid-connected PV PCS uses positive feedback control in the d-q frame. The proposed PLL and anti-islanding algorithm are implemented for a 250kW PV PCS. This system has four DC/DC converters each with a 25kW power rating. This is only one-third of the total system power. The experimental results show that the proposed PLL, anti-islanding method and topology demonstrate good performance in a 250kW PV PCS.

Original languageEnglish
Pages (from-to)360-368
Number of pages9
JournalJournal of Power Electronics
Volume11
Issue number3
Publication statusPublished - 2011 May 1

Fingerprint

Phase locked loops
Feedback
Fast Fourier transforms
Controllers
Tuning
Electric potential
DC-DC converters
Feedback control
Topology

Keywords

  • Anti-Islanding
  • Grid-Connected
  • Photovoltaic PCS
  • PLL

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering

Cite this

Active frequency with a positive feedback anti-islanding method based on a robust PLL algorithm for grid-connected PV PCS. / Lee, Jong Pil; Min, Byung Duk; Kim, Tae Jin; Yoo, Dong Wook; Yoo, Ji Yoon.

In: Journal of Power Electronics, Vol. 11, No. 3, 01.05.2011, p. 360-368.

Research output: Contribution to journalArticle

@article{1454b814395643b59151a45d97839c23,
title = "Active frequency with a positive feedback anti-islanding method based on a robust PLL algorithm for grid-connected PV PCS",
abstract = "This paper proposes an active frequency with a positive feedback in the d-q frame anti-islanding method suitable for a robust phase-locked loop (PLL) algorithm using the FFT concept. In general, PLL algorithms for grid-connected PV PCS use d-q transformation and controllers to make zero an imaginary part of the transformed voltage vector. In a real grid system, the grid voltage is not ideal. It may be unbalanced, noisy and have many harmonics. For these reasons, the d-q transformed components do not have a pure DC component. The controller tuning of a PLL algorithm is difficult. The proposed PLL algorithm using the FFT concept can use the strong noise cancelation characteristics of a FFT algorithm without a PI controller. Therefore, the proposed PLL algorithm has no gain-tuning of a PI controller, and it is hardly influenced by voltage drops, phase step changes and harmonics. Islanding prediction is a necessary feature of inverter-based photovoltaic (PV) systems in order to meet the stringent standard requirements for interconnection with an electrical grid. Both passive and active anti-islanding methods exist. Typically, active methods modify a given parameter, which also affects the shape and quality of the grid injected current. In this paper, the active anti-islanding algorithm for a grid-connected PV PCS uses positive feedback control in the d-q frame. The proposed PLL and anti-islanding algorithm are implemented for a 250kW PV PCS. This system has four DC/DC converters each with a 25kW power rating. This is only one-third of the total system power. The experimental results show that the proposed PLL, anti-islanding method and topology demonstrate good performance in a 250kW PV PCS.",
keywords = "Anti-Islanding, Grid-Connected, Photovoltaic PCS, PLL",
author = "Lee, {Jong Pil} and Min, {Byung Duk} and Kim, {Tae Jin} and Yoo, {Dong Wook} and Yoo, {Ji Yoon}",
year = "2011",
month = "5",
day = "1",
language = "English",
volume = "11",
pages = "360--368",
journal = "Journal of Power Electronics",
issn = "1598-2092",
publisher = "Korean Institute of Power Electronics",
number = "3",

}

TY - JOUR

T1 - Active frequency with a positive feedback anti-islanding method based on a robust PLL algorithm for grid-connected PV PCS

AU - Lee, Jong Pil

AU - Min, Byung Duk

AU - Kim, Tae Jin

AU - Yoo, Dong Wook

AU - Yoo, Ji Yoon

PY - 2011/5/1

Y1 - 2011/5/1

N2 - This paper proposes an active frequency with a positive feedback in the d-q frame anti-islanding method suitable for a robust phase-locked loop (PLL) algorithm using the FFT concept. In general, PLL algorithms for grid-connected PV PCS use d-q transformation and controllers to make zero an imaginary part of the transformed voltage vector. In a real grid system, the grid voltage is not ideal. It may be unbalanced, noisy and have many harmonics. For these reasons, the d-q transformed components do not have a pure DC component. The controller tuning of a PLL algorithm is difficult. The proposed PLL algorithm using the FFT concept can use the strong noise cancelation characteristics of a FFT algorithm without a PI controller. Therefore, the proposed PLL algorithm has no gain-tuning of a PI controller, and it is hardly influenced by voltage drops, phase step changes and harmonics. Islanding prediction is a necessary feature of inverter-based photovoltaic (PV) systems in order to meet the stringent standard requirements for interconnection with an electrical grid. Both passive and active anti-islanding methods exist. Typically, active methods modify a given parameter, which also affects the shape and quality of the grid injected current. In this paper, the active anti-islanding algorithm for a grid-connected PV PCS uses positive feedback control in the d-q frame. The proposed PLL and anti-islanding algorithm are implemented for a 250kW PV PCS. This system has four DC/DC converters each with a 25kW power rating. This is only one-third of the total system power. The experimental results show that the proposed PLL, anti-islanding method and topology demonstrate good performance in a 250kW PV PCS.

AB - This paper proposes an active frequency with a positive feedback in the d-q frame anti-islanding method suitable for a robust phase-locked loop (PLL) algorithm using the FFT concept. In general, PLL algorithms for grid-connected PV PCS use d-q transformation and controllers to make zero an imaginary part of the transformed voltage vector. In a real grid system, the grid voltage is not ideal. It may be unbalanced, noisy and have many harmonics. For these reasons, the d-q transformed components do not have a pure DC component. The controller tuning of a PLL algorithm is difficult. The proposed PLL algorithm using the FFT concept can use the strong noise cancelation characteristics of a FFT algorithm without a PI controller. Therefore, the proposed PLL algorithm has no gain-tuning of a PI controller, and it is hardly influenced by voltage drops, phase step changes and harmonics. Islanding prediction is a necessary feature of inverter-based photovoltaic (PV) systems in order to meet the stringent standard requirements for interconnection with an electrical grid. Both passive and active anti-islanding methods exist. Typically, active methods modify a given parameter, which also affects the shape and quality of the grid injected current. In this paper, the active anti-islanding algorithm for a grid-connected PV PCS uses positive feedback control in the d-q frame. The proposed PLL and anti-islanding algorithm are implemented for a 250kW PV PCS. This system has four DC/DC converters each with a 25kW power rating. This is only one-third of the total system power. The experimental results show that the proposed PLL, anti-islanding method and topology demonstrate good performance in a 250kW PV PCS.

KW - Anti-Islanding

KW - Grid-Connected

KW - Photovoltaic PCS

KW - PLL

UR - http://www.scopus.com/inward/record.url?scp=79957441812&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79957441812&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:79957441812

VL - 11

SP - 360

EP - 368

JO - Journal of Power Electronics

JF - Journal of Power Electronics

SN - 1598-2092

IS - 3

ER -