Abstract
When a voltage source converter (VSC) connects to a parallel compensated grid, high-frequency resonance (HFR) is a subsistent issue that exists in the interconnected system. HFR will introduce a significantly high-frequency voltage component at the point of common coupling, thereby the performance of the VSC system can be deteriorated seriously. For improving the operation of the VSC system under the parallel compensated grid, this study proposes an HFR damping strategy based on a voltage feedforward control to reshape the impedance of grid connected VSC. The VSC system with the proposed control strategy can damp HFR in a wide high-frequency range without employing the frequency detection and introducing the differential elements so that the negative influence caused by the high-frequency noise can be avoided. Theoretical analysis and experimental results are given to verify the effectiveness and availability of the proposed damping control strategy.
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