A hybrid active damping control method based on LCL grid-connected inverter
By employing a hybrid active damping control method for LCL grid-connected inverters, combined with dual closed-loop control of inductor current and capacitor voltage on the inverter side, the resonance and current quality issues of LCL filters were resolved, achieving low harmonic output and stable operation, and reducing system costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HENAN MECHANICAL & ELECTRICAL ENG COLLEGE
- Filing Date
- 2026-04-09
- Publication Date
- 2026-07-17
AI Technical Summary
LCL filters suffer from resonance problems in grid-connected inverter systems, especially in weak grid conditions, which affect system stability and current quality. Existing active damping control strategies may introduce additional sensor costs.
A hybrid active damping control method based on LCL grid-connected inverters is adopted. By combining Clark-Park converter, PI controller, time delay module and sinusoidal pulse width modulation module, dual closed-loop control of inductor current and capacitor voltage on the inverter side is realized. Resonance is suppressed and PWM drive signal is generated to control the working state of inverter switching transistors.
It effectively reduces the grid-connected current harmonics (THD) to below 5%, improves the system's anti-interference capability and dynamic response, ensures stable operation of the system under weak grid conditions, requires no additional sensors, and has a low cost.
Smart Images
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