A transformerless STATCOM based on a hybrid Boost Modular Multilevel Converter with reduced number of switches

Ahmed A. Elserougi, Ahmed M. Massoud, Shehab Ahmed

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This paper proposes a new three-phase transformerless STATic synchronous COMpensator (STATCOM) for shunt reactive power compensation in medium/high-voltage applications. The proposed STATCOM is based on a hybrid Boost Modular Multilevel Converter (hybrid BMMC) with a reduced number of Full-Bridge SubModules (FB-SMs). Operating with almost zero displacement factor at the ac terminals of the converter guarantees sufficient charging and discharging time intervals for the Half-Bridge SMs (HB-SMs) which ensures well-balanced capacitor voltages. Conventionally, each arm in a hybrid BMMC contains FB-SMs and HB-SMs with a ratio of 2:1 respectively. In this work, a new hybrid BMMC with a ratio of 1:2 is employed, which enables operating with a reduced number of FB-SMs with the same boosting capability, therefore, enabling transformerless operation. Nonetheless, the tradeoff is the loss of the dc fault blocking capability compared to the 2:1 configuration. This may be acceptable in STATCOM applications, as the possibility of having a dc side fault in such application is limited, compared to, for instance, MMC in high voltage dc network applications. In this work, detailed illustration of the proposed STATCOM configuration along with its controllers are presented. Finally, simulation case studies are considered to demonstrate the effectiveness of the proposed approach. The simulation results show promising and satisfactory performance.

Original languageEnglish
Pages (from-to)341-348
Number of pages8
JournalElectric Power Systems Research
Volume146
DOIs
Publication statusPublished - 1 May 2017

Fingerprint

Switches
Electric potential
Reactive power
Capacitors
Controllers

Keywords

  • Multilevel inverter
  • STATCOM
  • VAr compensation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

A transformerless STATCOM based on a hybrid Boost Modular Multilevel Converter with reduced number of switches. / Elserougi, Ahmed A.; Massoud, Ahmed M.; Ahmed, Shehab.

In: Electric Power Systems Research, Vol. 146, 01.05.2017, p. 341-348.

Research output: Contribution to journalArticle

@article{ac9856e8019f43aeab5e4c892056955b,
title = "A transformerless STATCOM based on a hybrid Boost Modular Multilevel Converter with reduced number of switches",
abstract = "This paper proposes a new three-phase transformerless STATic synchronous COMpensator (STATCOM) for shunt reactive power compensation in medium/high-voltage applications. The proposed STATCOM is based on a hybrid Boost Modular Multilevel Converter (hybrid BMMC) with a reduced number of Full-Bridge SubModules (FB-SMs). Operating with almost zero displacement factor at the ac terminals of the converter guarantees sufficient charging and discharging time intervals for the Half-Bridge SMs (HB-SMs) which ensures well-balanced capacitor voltages. Conventionally, each arm in a hybrid BMMC contains FB-SMs and HB-SMs with a ratio of 2:1 respectively. In this work, a new hybrid BMMC with a ratio of 1:2 is employed, which enables operating with a reduced number of FB-SMs with the same boosting capability, therefore, enabling transformerless operation. Nonetheless, the tradeoff is the loss of the dc fault blocking capability compared to the 2:1 configuration. This may be acceptable in STATCOM applications, as the possibility of having a dc side fault in such application is limited, compared to, for instance, MMC in high voltage dc network applications. In this work, detailed illustration of the proposed STATCOM configuration along with its controllers are presented. Finally, simulation case studies are considered to demonstrate the effectiveness of the proposed approach. The simulation results show promising and satisfactory performance.",
keywords = "Multilevel inverter, STATCOM, VAr compensation",
author = "Elserougi, {Ahmed A.} and Massoud, {Ahmed M.} and Shehab Ahmed",
year = "2017",
month = "5",
day = "1",
doi = "10.1016/j.epsr.2017.02.014",
language = "English",
volume = "146",
pages = "341--348",
journal = "Electric Power Systems Research",
issn = "0378-7796",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - A transformerless STATCOM based on a hybrid Boost Modular Multilevel Converter with reduced number of switches

AU - Elserougi, Ahmed A.

AU - Massoud, Ahmed M.

AU - Ahmed, Shehab

PY - 2017/5/1

Y1 - 2017/5/1

N2 - This paper proposes a new three-phase transformerless STATic synchronous COMpensator (STATCOM) for shunt reactive power compensation in medium/high-voltage applications. The proposed STATCOM is based on a hybrid Boost Modular Multilevel Converter (hybrid BMMC) with a reduced number of Full-Bridge SubModules (FB-SMs). Operating with almost zero displacement factor at the ac terminals of the converter guarantees sufficient charging and discharging time intervals for the Half-Bridge SMs (HB-SMs) which ensures well-balanced capacitor voltages. Conventionally, each arm in a hybrid BMMC contains FB-SMs and HB-SMs with a ratio of 2:1 respectively. In this work, a new hybrid BMMC with a ratio of 1:2 is employed, which enables operating with a reduced number of FB-SMs with the same boosting capability, therefore, enabling transformerless operation. Nonetheless, the tradeoff is the loss of the dc fault blocking capability compared to the 2:1 configuration. This may be acceptable in STATCOM applications, as the possibility of having a dc side fault in such application is limited, compared to, for instance, MMC in high voltage dc network applications. In this work, detailed illustration of the proposed STATCOM configuration along with its controllers are presented. Finally, simulation case studies are considered to demonstrate the effectiveness of the proposed approach. The simulation results show promising and satisfactory performance.

AB - This paper proposes a new three-phase transformerless STATic synchronous COMpensator (STATCOM) for shunt reactive power compensation in medium/high-voltage applications. The proposed STATCOM is based on a hybrid Boost Modular Multilevel Converter (hybrid BMMC) with a reduced number of Full-Bridge SubModules (FB-SMs). Operating with almost zero displacement factor at the ac terminals of the converter guarantees sufficient charging and discharging time intervals for the Half-Bridge SMs (HB-SMs) which ensures well-balanced capacitor voltages. Conventionally, each arm in a hybrid BMMC contains FB-SMs and HB-SMs with a ratio of 2:1 respectively. In this work, a new hybrid BMMC with a ratio of 1:2 is employed, which enables operating with a reduced number of FB-SMs with the same boosting capability, therefore, enabling transformerless operation. Nonetheless, the tradeoff is the loss of the dc fault blocking capability compared to the 2:1 configuration. This may be acceptable in STATCOM applications, as the possibility of having a dc side fault in such application is limited, compared to, for instance, MMC in high voltage dc network applications. In this work, detailed illustration of the proposed STATCOM configuration along with its controllers are presented. Finally, simulation case studies are considered to demonstrate the effectiveness of the proposed approach. The simulation results show promising and satisfactory performance.

KW - Multilevel inverter

KW - STATCOM

KW - VAr compensation

UR - http://www.scopus.com/inward/record.url?scp=85013796718&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85013796718&partnerID=8YFLogxK

U2 - 10.1016/j.epsr.2017.02.014

DO - 10.1016/j.epsr.2017.02.014

M3 - Article

AN - SCOPUS:85013796718

VL - 146

SP - 341

EP - 348

JO - Electric Power Systems Research

JF - Electric Power Systems Research

SN - 0378-7796

ER -