Modelling Control Methods for PV-Based Communal Grids with Different Line Resistances and Impedances

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Different droop control methods for PV-based communal grid networks (minigrids and microgrids) with different line resistances (R) and impedances (X) are modelled and simulated in MATLAB to determine the most efficient control method for a given network. Results show that active power-frequency (P-f) droop control method is the most efficient for low voltage transmission networks with low X/R ratios while reactive power-voltage (Q-V) droop control method is the most efficient for systems with high X/R ratios. For systems with complex line resistances and impedances, i.e. near unity X/R ratios, P-f or Q-V droop methods cannot individually efficiently regulate line voltage and frequency. For such systems, P-Q-f droop control method, where both active and reactive power could be used to control PCC voltage via shunt-connected inverters, is determined to be the most efficient control method. Results also show that shunt-connection of inverters leads to improved power flow control of interconnected communal grids by allowing feeder voltage regulation, load reactive power support, reactive power management between feeders, and improved overall system performance against dynamic disturbances
LanguageEnglish
Title of host publicationProceedings of the 35th EU PVSEC 2018
Chapter6
Pages1870-1875
Number of pages6
DOIs
Publication statusPublished - 7 Nov 2018

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Reactive power
Voltage control
Electric potential
Electric power transmission networks
Flow control
Power control
MATLAB

Keywords

  • Droop Control
  • Inverter
  • Communal Grid

Cite this

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title = "Modelling Control Methods for PV-Based Communal Grids with Different Line Resistances and Impedances",
abstract = "Different droop control methods for PV-based communal grid networks (minigrids and microgrids) with different line resistances (R) and impedances (X) are modelled and simulated in MATLAB to determine the most efficient control method for a given network. Results show that active power-frequency (P-f) droop control method is the most efficient for low voltage transmission networks with low X/R ratios while reactive power-voltage (Q-V) droop control method is the most efficient for systems with high X/R ratios. For systems with complex line resistances and impedances, i.e. near unity X/R ratios, P-f or Q-V droop methods cannot individually efficiently regulate line voltage and frequency. For such systems, P-Q-f droop control method, where both active and reactive power could be used to control PCC voltage via shunt-connected inverters, is determined to be the most efficient control method. Results also show that shunt-connection of inverters leads to improved power flow control of interconnected communal grids by allowing feeder voltage regulation, load reactive power support, reactive power management between feeders, and improved overall system performance against dynamic disturbances",
keywords = "Droop Control, Inverter, Communal Grid",
author = "Nicholas Opiyo",
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day = "7",
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language = "English",
isbn = "3-936338-50-7",
pages = "1870--1875",
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}

Modelling Control Methods for PV-Based Communal Grids with Different Line Resistances and Impedances. / Opiyo, Nicholas.

Proceedings of the 35th EU PVSEC 2018. 2018. p. 1870-1875.

Research output: Chapter in Book/Report/Conference proceedingChapter

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AB - Different droop control methods for PV-based communal grid networks (minigrids and microgrids) with different line resistances (R) and impedances (X) are modelled and simulated in MATLAB to determine the most efficient control method for a given network. Results show that active power-frequency (P-f) droop control method is the most efficient for low voltage transmission networks with low X/R ratios while reactive power-voltage (Q-V) droop control method is the most efficient for systems with high X/R ratios. For systems with complex line resistances and impedances, i.e. near unity X/R ratios, P-f or Q-V droop methods cannot individually efficiently regulate line voltage and frequency. For such systems, P-Q-f droop control method, where both active and reactive power could be used to control PCC voltage via shunt-connected inverters, is determined to be the most efficient control method. Results also show that shunt-connection of inverters leads to improved power flow control of interconnected communal grids by allowing feeder voltage regulation, load reactive power support, reactive power management between feeders, and improved overall system performance against dynamic disturbances

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KW - Inverter

KW - Communal Grid

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