An Enhanced Time Delay Based Reference Current Identification Method for Single Phase System
IEEE journal of emerging and selected topics in industrial electronics(2021)
摘要
This paper proposes an enhanced time delay based current component identification method for single-phase systems to overcome the absence of filtering and poor grid frequency response of conventional method. The proposed technique integrates a delayed signal cancellation (DSC) with a time delay unit, to incorporate a dc offset rejection feature, while maintaining speedy and precise extraction of orthogonal current components. The frequency adaption is also developed through the incorporation of linear interpolation. The dynamic and steady-state performance of the proposed method is analysed and compared with two advanced second-order generalised integrator (SOGI) based methods, namely, modified SOGI and cascaded SOGI under different operating scenarios. The simulation and experimental results substantiate the advantage of zero steady-state error and lower settling time of the proposed solution while exhibiting comparable overshoot with advanced SOGI based methods.
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关键词
Active power filters,low-pass filters (LPFs),orthogonal signal generation (OSG),reference current generation
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