Abstract
This paper compares two control schemes in the application control layer of a non-PLL grid-forming (GFM) inverter to gain the insights and understanding of how the two schemes affect the dynamic responses of the GFM inverters and the transition operation of microgrids. Both schemes can achieve smooth microgrid transition operation and power tracking, however, the first scheme expects to exhibit more transients due to the feedforward of the inverse dynamic model of the output filter. Simulation results show that both control schemes achieve successful transition operation with smooth transients, and the second control scheme exhibits slightly better transients in the system frequency during islanding operation and the first one has slightly superior transients in the system frequency during reconnection operation. The power tracking performance in the grid-connected mode is evaluated, which shows that the first scheme has better active power tracking and the second one has better reactive power tracking. The analysis and results are useful to develop reliable control schemes for non-PLL GFM inverters because more and more inverters will work as non-PLL grid-forming sources in the future grids due to better stability and reliability.
Original language | American English |
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Number of pages | 11 |
State | Published - 2021 |
Event | IEEE Energy Conversion Congress and Exposition (ECCE 2021) - Duration: 10 Oct 2021 → 14 Oct 2021 |
Conference
Conference | IEEE Energy Conversion Congress and Exposition (ECCE 2021) |
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Period | 10/10/21 → 14/10/21 |
Bibliographical note
See NREL/CP-5D00-82059 for paper as published in proceedingsNREL Publication Number
- NREL/CP-5D00-78874
Keywords
- grid-forming inverter
- microgrid transition operation
- non-PLL