Stability Analysis and Control of a Microgrid against Circulating Power between Parallel Inverters

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.

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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.

Item Type: Article
Identification Number:
Page Range: 1061-1070
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 30 Nov 2018 16:27
Last Modified: 18 Mar 2021 02:52

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