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1. Renewable energy is a key solution to address energy shortages and environmental pollution crises. Many countries are accelerating the deployment of renewable energy to meet carbon emission reduction targets.

2. LCL filters are commonly used in grid-connected inverters for better harmonics attenuation and smaller size. However, they can cause resonance issues in the system. Passive damping methods, such as adding resistors, can solve this problem but result in high power losses and reduced harmonics attenuation capability.

3. Active damping methods, which utilize additional variables like filter capacitor current or voltage feedback, are more flexible and effective in mitigating resonance issues. These methods require complex derivative feedback or current control loop feedback for successful implementation.

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