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Stability analysis and control of a microgrid against circulating power between parallel inverters

Stability analysis and control of a microgrid against circulating power between parallel inverters
Stability analysis and control of a microgrid against circulating power between parallel inverters

In grid-connected mode, the grid normally absorbs all the power generated by each inverter in a microgrid. Droop control-based microgrid power management employs the frequency as a wireless communication to determine the power outage. However, in the cases of grid loss, each inverter should receive, from a supervisory controller, new settings of the output power suitable to the microgrid load. Because of the supervisory controllers are slower than the droop control loops, this might produce unstable dynamics caused by the excess generated power circulating between the inverters if the microgrid load is low. This case degrades the microgrid stability leading the DC link voltage of each inverter to rise to trip point. In this paper, a PD voltage control loop is proposed to stabilize the system and minimize the circulating power so providing more time for the supervisory control to respond without tripping any inverter. A detailed small signal model is developed and stability analysis is performed to tune the controller’s gain. Matlab/Simulink results validate the performance of the proposed controller.

Circulating power, Dc voltage, Droop control, Microgrid
1876-6102
1061-1070
Issa, Walid
539ed2e1-38ee-436c-b7c2-4678fb116f1d
Al-Naemi, Faris
46c273c7-49fa-4fe3-b098-313f7cd3c6ac
Konstantopoulos, George
52c36e23-7443-4ca6-83d1-8db903c4f3b7
Sharkh, Sulieman
c8445516-dafe-41c2-b7e8-c21e295e56b9
Abusara, Mohammad
4b927b5e-0c68-45bb-8d01-4c22d94ccc7a
Issa, Walid
539ed2e1-38ee-436c-b7c2-4678fb116f1d
Al-Naemi, Faris
46c273c7-49fa-4fe3-b098-313f7cd3c6ac
Konstantopoulos, George
52c36e23-7443-4ca6-83d1-8db903c4f3b7
Sharkh, Sulieman
c8445516-dafe-41c2-b7e8-c21e295e56b9
Abusara, Mohammad
4b927b5e-0c68-45bb-8d01-4c22d94ccc7a

Issa, Walid, Al-Naemi, Faris, Konstantopoulos, George, Sharkh, Sulieman and Abusara, Mohammad (2019) Stability analysis and control of a microgrid against circulating power between parallel inverters. Energy Procedia, 157, 1061-1070. (doi:10.1016/j.egypro.2018.11.273).

Record type: Article

Abstract

In grid-connected mode, the grid normally absorbs all the power generated by each inverter in a microgrid. Droop control-based microgrid power management employs the frequency as a wireless communication to determine the power outage. However, in the cases of grid loss, each inverter should receive, from a supervisory controller, new settings of the output power suitable to the microgrid load. Because of the supervisory controllers are slower than the droop control loops, this might produce unstable dynamics caused by the excess generated power circulating between the inverters if the microgrid load is low. This case degrades the microgrid stability leading the DC link voltage of each inverter to rise to trip point. In this paper, a PD voltage control loop is proposed to stabilize the system and minimize the circulating power so providing more time for the supervisory control to respond without tripping any inverter. A detailed small signal model is developed and stability analysis is performed to tune the controller’s gain. Matlab/Simulink results validate the performance of the proposed controller.

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More information

e-pub ahead of print date: 25 January 2019
Published date: January 2019
Venue - Dates: 2018 Technologies and Materials for Renewable Energy, Environment and Sustainability, TMREES 2018, Greece, 2018-09-18 - 2018-09-20
Keywords: Circulating power, Dc voltage, Droop control, Microgrid

Identifiers

Local EPrints ID: 430790
URI: http://eprints.soton.ac.uk/id/eprint/430790
ISSN: 1876-6102
PURE UUID: 59ca3185-73e4-4d5f-a452-6c06a4020c2c

Catalogue record

Date deposited: 13 May 2019 16:30
Last modified: 07 Oct 2020 00:37

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