Abstract
Droop control strategy is widely used to control parallel inverters in a microgrid. However, due to the mismatched line impedance, the traditional droop control strategy is difficult to evenly share the reactive power and restrain the circulating current among multiple parallel inverters. In this article, an adaptive virtual impedance-based droop control strategy without communications is proposed to solve the reactive power sharing problem caused by the difference of line impedance. The reactive power output and voltage of each distribution generator are introduced into the adaptive virtual impedance controller to achieve a tradeoff between reactive power sharing accuracy and voltage drop. Small-signal stability analysis of the inverters equipped with the proposed controller is conducted to determine the optimal control parameters. Simulation and experimental results demonstrate the effectiveness of the proposed droop control strategy.
Original language | English |
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Journal | IEEE Transactions on Industrial Electronics |
Volume | 69 |
Issue number | 11 |
Pages (from-to) | 11335-11347 |
Number of pages | 13 |
ISSN | 0278-0046 |
DOIs | |
Publication status | Published - 1 Nov 2022 |
Bibliographical note
Publisher Copyright:IEEE
Keywords
- Adaptive virtual impedance
- droop control
- Frequency control
- Impedance
- Inverters
- microgrid
- Microgrids
- parallel inverters
- Reactive power
- reactive power sharing
- Resistance
- Voltage control