About Resonance problem of photovoltaic grid-connected inverter
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About Resonance problem of photovoltaic grid-connected inverter video introduction
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6 FAQs about [Resonance problem of photovoltaic grid-connected inverter]
What is the resonance mechanism of photovoltaic grid-connected system?
The resonance mechanism of photovoltaic grid-connected system is analyzed based on frequency domain analysis method. The notch filter is added into the active damping control method, and the active damping of the system is enhanced by using the notch characteristics.
How to suppress resonance problem of photovoltaic grid-connected system?
In order to effectively suppress the resonance problem of photovoltaic grid-connected system, an optimization method of active damping resonance suppression is proposed by combining active damping notch control method and active damper method.
Why do inverter-grid systems have a resonance phenomenon?
In inverter-grid systems, some studies have pointed out that a resonance phenomenon can arise when the inverter output impedance matches the grid impedance, due to various grid impedances [20, 21, 22, 23]. In addition, frequency-varying resonances were analyzed in . Consequently, the harmonics in the grid current can be inordinate.
Do parallel photovoltaic inverters have resonance risks?
This study addresses resonance risks in parallel photovoltaic inverters, especially with LCL filters in weak grid environments, proposing an innovative resolution. Beyond establishing the system's mathematical model, our approach introduces a novel grid-connected current feedback control strategy through resonance analysis.
How to avoid harmonic resonance in a grid-connected inverter?
Therefore, the system should have a high-stability margin to avoid the harmonic resonance, despite a varied grid impedance. In order to improve the system robustness against parameters uncertainties and to avoid harmonic resonance, a LQR method based on optimal control theory is proposed for the grid-connected inverter.
Why does a PV inverter have a series parallel resonance?
When the PV inverter is connected to the grid, series–parallel resonance may occur due to the dynamic interaction between multiple inverters operating in parallel and between the PV inverter and the grid impedance. Consequently, this leads to changes in the output voltage harmonic characteristics of the PV plant.