The Resonance Suppression for Parallel Photovoltaic Grid-connected Inverters in Weak Grid

Obvious resonance peak will be generated when parallel photovoltaic grid-connected inverters are connected to the weak grid with high grid impedance, which seriously affects the stability of grid-connected operation of the photovoltaic system. To overcome the problems mentioned above, the mathematic...

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Bibliographic Details
Published in:International journal of automation and computing 2018-12, Vol.15 (6), p.716-727
Main Authors: Yang, Qiu-Xia, Li, Kun, Zhao, Cui-Mei, Wang, Hu
Format: Article
Language:English
Subjects:
CAE) and Design
Computer Applications
Computer simulation
Computer-Aided Engineering (CAD
Control
Electric potential
Engineering
Impedance
Inverters
Mechatronics
Parallel operation
Research Article
Robotics
Stability
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Summary:Obvious resonance peak will be generated when parallel photovoltaic grid-connected inverters are connected to the weak grid with high grid impedance, which seriously affects the stability of grid-connected operation of the photovoltaic system. To overcome the problems mentioned above, the mathematical model of the parallel photovoltaic inverters is established. Several factors including the impact of the reference current of the grid-connected inverter, the grid voltage interference and the current disturbance between the photovoltaic inverters in parallel with the grid-connected inverters are analyzed. The grid impedance and the LCL filter of the photovoltaic inverter system are found to be the key elements which lead to existence of resonance peak. This paper presents the branch voltage and current double feedback suppression method under the premise of not changing the topological structure of the photovoltaic inverter, which effectively handles the resonance peak, weakens the harmonic content of the grid current of the photovoltaic grid-connected inverter and the voltage at the point of common coupling, and improves the stability of the parallel operation of the photovoltaic grid-connected inverters in weak grid. At last, the simulation model is established to verify the reliability of this suppression method.
ISSN:1476-8186
1751-8520
DOI:10.1007/s11633-017-1072-0