Abstract In order to promote the practical application of the Rogowski coil-based electronic transformers, it is of great necessity to handle the issues associated with the measurement error and interference in the integral process of the electronic transformer. In this paper, an improved digital integral algorithm with frequency self-adaption ability that aimed at overcoming the above-mentioned issues is proposed. Based on the electronic transformer calibration and harmonic measurement requirements, two specific applications of the proposed integral algorithm are carried out to validate the practical feasibility of the proposed algorithm. Experimental results reveal the improved performance of the Rogowski coil-based electronic transformer equipped with the proposed digital integral algorithm. Errors in harmonic currents measurement (up to 50th order) can be significantly reduced to a level less than 0.01% at a sampling frequency of 12.8 kHz by employing the proposed algorithm. For calibrating electronic transformers, results show that the performance of the proposed algorithm is better than the conventional trapezoidal integral algorithm and Simpson algorithm. Furthermore, the proposed algorithm has the ability to eliminate the impact of frequency fluctuation around the power frequency.

中文翻译：

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一种提高基于 Rogowski 线圈的电子变压器测量精度的改进数字积分算法

摘要 为了促进基于罗氏线圈的电子变压器的实际应用，解决电子变压器积分过程中的测量误差和干扰问题是非常必要的。针对上述问题，本文提出了一种改进的具有频率自适应能力的数字积分算法。基于电子互感器校准和谐波测量要求，对所提出的积分算法进行了两次具体的应用，以验证所提出算法的实际可行性。实验结果表明，配备了所提出的数字积分算法的基于 Rogowski 线圈的电子变压器的性能得到了提高。通过采用所提出的算法，在 12.8 kHz 的采样频率下，谐波电流测量（高达 50 次）的误差可以显着降低到小于 0.01% 的水平。对于电子变压器的标定，结果表明所提算法的性能优于传统的梯形积分算法和辛普森算法。此外，所提出的算法具有消除电源频率周围频率波动的影响的能力。