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A Modified Demodulation Technique for Single-Phase Grid Voltage Fundamental Parameter Estimation

机译:单相电网电压基本参数估计的一种解调技术

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摘要

This paper proposes a modified demodulation technique to provide accurate estimation of the single-phase grid voltage fundamental amplitude, frequency, and phase angle under distorted grid conditions. A quadrature oscillator is combined with a demodulation technique for rejecting oscillations at second harmonic generated by the demodulation of the fundamental voltage component; thus, it can provide more accurate estimation, as compared to a conventional one, using same-order and cutoff-frequency-based infinite-impulse-response low-pass filters after the demodulation stage. It also does not require a separate frequency estimation algorithm for adaptive demodulation as the frequency is obtained from the estimated initial phase by using a differentiation operation and an integral controller. The technique is relatively simple and can also reject the negative effects caused by harmonics under a wide range of fundamental frequency variation as specified by the standard requirements. When compared with a quadrature phase-locked loop technique, the proposed one provides improved estimation of the fundamental voltage parameters. The performance of the proposed technique is verified using both simulation and experimental results.
机译:本文提出了一种改进的解调技术,可在畸变的电网条件下准确估算单相电网电压的基本幅度,频率和相角。正交振荡器与解调技术相结合,可抑制由基波电压解调产生的二次谐波产生的振荡。因此,与传统方法相比,在解调阶段之后,使用相同阶次和基于截止频率的无限冲激响应低通滤波器可以提供比传统方法更准确的估计。由于通过使用微分运算和积分控制器从估计的初始相位获得频率,因此它也不需要用于自适应解调的单独的频率估计算法。该技术相对简单,并且还可以消除标准要求所规定的在宽范围的基本频率变化下由谐波引起的负面影响。与正交锁相环技术相比,提出的一种技术提供了对基本电压参数的改进估算。仿真和实验结果均验证了所提技术的性能。

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