Abstract
The main control loop of the synchronizer of the Grid Forming inverter can be synchronized with the voltage of the grid without using a phase-locked loop. However, in order to enable the inverter to realize the frequency regulation function accurately, a phase-locked loop is still required to obtain the grid`s frequency information. Since the time constants of the phase-locked loop and P-f loop of grid forming control are at the same order of magnitude, the introduction of the phase-locked loop will affect the original dynamic performance of P-f loop. In this paper, small-signal modelling is performed on the P-f loop of the grid forming with considering phase-locked loop to obtain the transfer function of the system. The influence of the cutoff frequency of phase-locked loop on the system dynamics is mainly related to the expected damping of the P-f loop. When the P-f loop of the system is designed to be underdamped, decreasing the cutoff frequency of the phase-locked loop can increase the system damping, which increases the adjustment time and reduces the overshoot. The paper uses controller hardware-in-the-loop to verify the analysis results.
Original language | English |
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Title of host publication | Wind Integration Workshop 2020 |
Editors | Uta Betancourt, Thomas Ackermann |
Place of Publication | Darmstadt |
Publisher | Energynautics GmbH |
Chapter | SESSION 4A: GRID FORMING ASPECTS II |
ISBN (Electronic) | 978-3-9820080-8-0 |
Publication status | Published - 11 Nov 2020 |
Event | Wind Integration Workshop 2020: 19th International Workshop on Large-scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants - Virtuell Duration: 11 Nov 2020 → 12 Nov 2020 https://windintegrationworkshop.org/ |
Conference
Conference | Wind Integration Workshop 2020 |
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City | Virtuell |
Period | 11/11/20 → 12/11/20 |
Internet address |
Keywords
- grid-connected inverters
- phase-locked loop
- grid forming
- virtual synchronous generator