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Active Damping Control Strategy for PLL-Synchronized Converters in Weak Grids | IEEE Conference Publication | IEEE Xplore

Active Damping Control Strategy for PLL-Synchronized Converters in Weak Grids


Abstract:

Phase-locked loop (PLL) introduces the negative resistance that leads to sideband oscillation, which compromises system stability in weak grids. This paper aims to reveal...Show More

Abstract:

Phase-locked loop (PLL) introduces the negative resistance that leads to sideband oscillation, which compromises system stability in weak grids. This paper aims to reveal the mechanism of system instability caused by the PLL from the point view of equivalent impedance. To enhance the system stability, a designed-oriented analysis is carried out and a active damping control strategy based on digital filters is proposed by eliminating the adverse effect of PLL. Moreover, the detailed control schemes and parameter design of the active damping control strategy are discussed. Finally, the effectiveness of the proposed control strategy is verified by the simulation results.
Date of Conference: 16-18 October 2023
Date Added to IEEE Xplore: 09 January 2024
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Conference Location: Karlsruhe, Germany

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I. Introduction

The past few years have witnessed an exponential growth of power converters in electric grids[l]. Unlike synchronous generators, power converters requires PLLs to track grid phase [2]. However, in weak grids, the small-signal instability (or harmonic instability) may happen due to the existence of PLL. It is reported that a higher PLL bandwidth yields a wider frequency range of negative resistance behavior [3], [4], which could further introduce sideband oscillations [5]. Many research works have thus been made to mitigate the influence of PLL on system stability.

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