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A frequency adaptive technique for accurate estimation of single-phase grid voltage fundamental parameters

机译:一种精确估计单相电网电压基本参数的频率自适应技术

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This paper proposes a frequency adaptive quadrature signal generator (QSG) for estimating the single-phase grid voltage fundamental parameters such as amplitude and frequency. The QSG relies on the anticonjugate decomposition (ACD) and the cascaded delayed signal cancellation (CDSC) strategies (QSG-ACDSC), and it is used to track the fundamental voltage amplitude. The frequency adaptive capability of the QSG-ACDSC is obtained by a frequency estimation algorithm based on the estimated fundamental orthogonal voltage waveforms. The technique is relatively simple and it can provide accurate estimation of fundamental voltage amplitude and frequency. The proposed technique shows less sensitivity to the presence of harmonics as compared to the QSG based on a second order generalized integrator and a frequency-locked loop. Simulation results are presented to verify the performance of the proposed technique.
机译:本文提出了一种频率自适应正交信号发生器(QSG),用于估计单相电网电压的基本参数,例如幅度和频率。 QSG依赖于抗共轭分解(ACD)和级联延迟信号消除(CDSC)策略(QSG-ACDSC),它用于跟踪基本电压幅度。 QSG-ACDSC的频率自适应能力是通过基于估计的基本正交电压波形的频率估计算法获得的。该技术相对简单,可以提供基本电压幅度和频率的准确估计。与基于二阶广义积分器和锁频环的QSG相比,所提出的技术对谐波的存在表现出较低的敏感性。仿真结果表明了所提出技术的性能。

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