However, as a third-order system, LCL grid-connected inverter has the challenge of high-frequency resonance and stability control. If these problems are not solved, the performance of grid-connected inverters will be seriously affected, especially in a weak grid environment.
LCL filters are extensively utilized in Grid-connected inverters due to their exceptional capability in suppressing high-frequency harmonics. The active damping method is commonly employed to mitigate the resonance peak of the LCL filter. However, this control strategy induces a shift in the natural resonance point.
(a) The grid frequency is 49.5 Hz. (b) The grid frequency is 50.5 Hz. The feedback and feedforward function is defined to solve the problem of natural resonance deviation of the LCL inverter caused by active damping, and the virtual impedance model of active damping is established. The control strategy of active damping superposition is proposed.
In particular, research has primarily centered around the LCL grid-connected inverter because of its excellent high-frequency harmonic filtering ability and low system inductance requirement. However, as a third-order system, LCL grid-connected inverter has the challenge of high-frequency resonance and stability control.
Abstract LCL filters are extensively utilized in Grid-connected inverters due to their exceptional capability in suppressing high-frequency harmonics. The active damping method is commonly employed to
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With the power grid gradually to a high proportion of new energy, high proportion of power electronic device direction forward. Grid-connected inverter is widely used as an important
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LCL filters are widely adopted as output filters for grid-connected inverters due to their exceptional high-frequency harmonic attenuation capability within a compact inductive volume,
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However, as a third-order system, LCL grid-connected inverter has the challenge of high-frequency resonance and stability control. If these problems are not solved, the performance of grid-connected
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For an LCL-type grid-connected inverter, the conventional capacitor-current-feedback type active damping control strategy can retain the high-frequency characteristics of LCL filter while
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The superior high-frequency harmonic suppression capability of LCL filters renders them a widely utilized component in grid-connected processes. Nevertheless, the perturbation of pertinent
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Optimizing parameter selection becomes crucial.LCL grid-connected inverters, as third-order systems, suffer from insufficient damping, leading to oscillations.
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Digital control delay may cause instability in LCL-filtered grid-connected inverters (LCL-GCI). In high-power distribution scenarios, the GCI mainly operates in low switching frequency (LSF)
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Abstract—An LCL filter offers superior attenuation for high-frequency harmonics for three-phase grid-following inverters compared to LC and L filters. However, it also introduces an inherent
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