Novel indices for power quality measurement

T. Lin, A. Domijan
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Abstract

Power quality indices and the corresponding measurement techniques are utilized to quantitatively present the quality of power supply, and characterize and compare the negative impacts of different disturbances to power networks. To overcome the limitations, deficiencies and difficulties of the practical application of power quality indices and measurement techniques in common use, a set of three new indices are proposed In this work to summarize the time varying waveform distortion in an intuitive, comprehensive and highly efficient way. Moreover, a novel time frequency transform is also developed for the first time to continuously and accurately monitor the instantaneous frequencies and amplitudes of specific signal components in the nonstationary power disturbance, and then update the PQ indices in real time.
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电能质量测量的新指标
电能质量指标和相应的测量技术被用来定量地描述供电质量,并描述和比较不同干扰对电网的负面影响。为了克服常用电能质量指标和测量技术在实际应用中的局限性、不足和困难,本文提出了一套三种新的电能质量指标,以直观、全面、高效地总结时变波形失真。此外,还首次提出了一种新的时频变换方法,可以连续准确地监测非平稳电力干扰下特定信号分量的瞬时频率和幅值,并实时更新PQ指标。
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On some spectrum estimation methods for analysis of nonstationary signals in power systems. Part I. Theoretical aspects Practical issues of three-phase, three-wire, voltage source inverter-based shunt active power filters Automated comprehensive assessment and visualization of voltage sag performance On four-conductors low voltage cables ampacity in balanced and unbalanced nonsinusoidal conditions Primary and secondary indices for power quality (PQ) survey reporting
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