Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 34, Issue 1, Pages 863-876Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2018.2815284
Keywords
Adaptive virtual resistor (AVR); droop control; harmonic; inverter; parallel; power sharing; unbalanced
Categories
Funding
- National Natural Science Foundation of China [51577079]
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In a low-voltage parallel inverter system, the active power, unbalanced power, and harmonic power generally cannot be properly shared among inverters with droop control due to the mismatch of output impedance. To address this issue, this paper proposes a two-stage adaptive virtual resistor (AVR) control scheme. In the first stage, a proportional-integral controller is applied to regulate the active power with the use of a synchronous maximum power bus (SMPB), and the reactive power is adjusted by means of a Q-omega droop controller. In the second stage, all inverters switch to a P-E droop controlmode by introducing the AVRs at fundamental positive-sequence, negative-sequence, and harmonic frequencies. Not only can this method eliminate the active power, unbalanced power, and harmonic power-sharing errors, it can also reduce the voltage deviation caused by the droop control. Moreover, the synchronization between inverters can be guaranteed as long as the SMPB is present, without using voltage sensors at the point of common coupling. Simulation and experimental results are provided to verify the feasibility of this method.
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