Damping Methods and Control Strategy of Current Source Grid-connected Photovoltaic Inverters
The current source photovoltaic grid-connected inverter has the advantages of unipolar boost and continuous in-put current,but the resonance peak of LC filter on the AC-side will damage system's stability.Therefore,various damp-ing methods are studied in this paper,and the damping method with optimum suppression to resonance peak is obtained according to the amplitude-frequency characteristic curves and converted into an active damping method.Then the double-closed-loop control system and the corresponding parameters for grid-connection current are investigated.Finally a simula-tive test based on the model established on MATLAB Simulink platform verifies feasibility and correctness of the reso-nance characteristic analysis and the proposed suppression method,indicating satisfactory steady-state and dynamic per-formance of the control system.
current source inverterresonance peakactive dampingcontrol system
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