Influence of Power-Frequency Droop on Grid Forming Inverter Current Damping in Mixed Source Islanded Microgrids

Westman, Jan; Hadidi, Ramtin

doi:10.1109/icps57144.2023.10142130

Cited by 1 publication

(1 citation statement)

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“…Furthermore, in [16,28], varia-tion in the operating point around which small-signal models were linearized produced minimal changes in the system modes. Finally, in [29], variation in the DER loading of a mixed-source microgrid had a small effect on modes of interest and did not substantially change the sensitivities of those modes to variation in the P-F droop parameter. Leveraging these findings as justification, a small-signal model of a microgrid , illustrated in Figure 1, was developed in order to perform sensitivity analyses to the P-F droop parameter and SG inertia constant.…”

Section: Small-signal Modeling Of a Mixed-source Microgridmentioning

confidence: 83%

Investigation on Tuning Power–Frequency Droop for Improved Grid–Forming Inverter and Synchronous Generator Transient Load Sharing

Westman,

Hadidi

2023

Energies

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Poor transient load sharing has been observed during the parallel operation of synchronous generators (SGs) and droop-controlled grid-forming (GFM) inverter-based resources (IBRs) in islanded microgrids. This can result in overcurrent protections, causing the inverters to trip, which leads to the collapse of voltage and frequency. In this article, small-signal analysis supported by electromagnetic transients (EMTs) simulation is performed on a detailed model of a microgrid containing IBRs and an SG to identify underdamped modes and their sensitivities to the power–frequency (P-F) droop parameter. Further EMT simulation of a more complex microgrid model with multiple GFM IBRs and SGs is performed to determine whether trends identified from the modal analysis extend to cases where the number of SGs in operation may vary. The objective is to investigate the effectiveness of tuning this parameter to reduce the likelihood of overcurrents in response to load and generation disturbances. The work uncovers both fast and slow modes of concern. Primarily, the findings show that increasing the P-F droop value improves the damping of the slower mode while degrading the damping of the faster mode, leading to an upper limit on the damping improvement of the GFM IBR output current. In EMT simulations of the more complex microgrid, the greatest damping improvement still exhibits significant maximum overshoot. Furthermore, the optimal value of the P-F droop parameter is sensitive to the number of SGs in operation. The conclusion is that tuning the P-F droop parameter is not an effective means to avoid the overcurrent tripping of GFM IBRs during response to large load or generation disturbances when operating in parallel to SGs in islanded microgrids.

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Section: Small-signal Modeling Of a Mixed-source Microgridmentioning

confidence: 83%