Dynamic Single-Phase Synchronized Phase and Frequency Estimation at the Distribution Level

Zhan, Lin; Liu, Yong; Culliss, Jerel; Zhao, Jianli; Li, Fangxing

doi:10.1109/tsg.2015.2400973

Cited by 77 publications

(46 citation statements)

References 22 publications

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“…Previous research has proposed algorithms that may improve measurement precision under noisy signals for PMUs [9]. The noise and harmonic content for distribution networks was investigated in [16] by collecting power grid signals; analysis showed that the SNR at the distribution level was around 60 dB. This measurement is used as a guide for creating the tests and also for interpreting the results.…”

Section: A Gaussian White Noisementioning

confidence: 99%

Phasor Measurement Unit Test Under Interference Conditions

Ghiga

Martin

et al. 2018

IEEE Trans. Power Delivery

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Abstract--This paper investigates the performance of Phasor Measurement Units (PMUs) under interference conditions which can appear in a power system and are not tested by the C37.118.1 standard. Three PMUs from different vendors configured for the M-class requirements were used to test three possible interference condition scenarios. In the first scenario, noise is added to the PMU input signal. The test runs a sweep of Signalto-Noise Ratios (SNR) and the accuracy versus the noise level is obtained. The second scenario injects multiple harmonics with the input to test the influence on accuracy. The last scenario focuses on instrument transformer saturation which leads to a modified waveform injected in the PMU. This test goes through different levels of Current Transformer (CT) saturation and analyzes the effect of saturation on the accuracy of PMUs. The test results show PMU measurements will be degraded when the input signal is distorted by high noise or a saturated current waveform, but is not particularly affected by multiple harmonics. This information can be used when selecting a PMU to ensure it will provide a reliable measurement for the intended use. It can also be used for developing more robust PMUs and applications resistant to degraded measurements.

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Section: A Gaussian White Noisementioning

confidence: 99%

Phasor Measurement Unit Test Under Interference Conditions

Ghiga

Martin

et al. 2018

IEEE Trans. Power Delivery

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“…The frequency disturbance recorder (FDR), a single-phase variant of the phasor measurement unit (PMU), is the main sensor of the FNET/GridEye [21]. In comparison with the conventional PMU, which requires high production and installation cost, the FDR measures from a normal single-phase electrical outlet at the 120 V distribution level [22]. These measurements are then synchronized by Global Positioning System (GPS)-based timestamps and transferred through Internet to the phasor data concentrator (PDC) for data processing and long-term storage [23].…”

Section: Wide-area Frequency Monitoring Network Fnet/grideyementioning

confidence: 99%

Impacts of Power Grid Frequency Deviation on Time Error of Synchronous Electric Clock and Worldwide Power System Practices on Time Error Correction

et al. 2017

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Synchronous electric clocks utilize power grid frequency as their timing reference. Power grid frequency deviation away from its nominal value results in synchronous electric clocks running fast or running slow (also known as the time error). In this article, statistical analysis on time error of synchronous electric clocks around the world is firstly presented using the power grid frequency measurements recorded by the wide-area frequency monitoring network FNET/GridEye. Then, the time error correction (TEC) process provided by electric utilities is analyzed and the worldwide TEC practice is investigated. Eventually, regions of the world where electric utilities provide TEC service are differentiated from those without TEC services. Analytical results demonstrate that the average time error of synchronous electric clocks in North America seems to be less than five seconds, and it has not changed very much over the past few years. On the other hand, the identification results present that up to the end of 2016, many electric utilities around the world, especially in North America and Europe, provided the TEC service to periodically remove the accumulative time error of synchronous electric clocks.

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“…Due to these upgrades, the steady-state phase angle and frequency measurement error of the Gen-III FDRs is less than 0.005 ̊ and 0.00006 Hz, respectively. The phasor measurement accuracy under dynamic conditions has also been improved by utilizing an improved DFT-based dynamic phasor measurement algorithm in Gen-III FDRs, which relies on multiple-step digital filters and a dynamic error compensation module [15]. The testing results show that the accuracy of Gen-III FDRs far exceeds the PMU Standard C37.118.1-2011 and C37.118.1a-2014.…”

Section: A Higher-accuracy Phasor Calculationmentioning

confidence: 99%

Wide-Area-Measurement System Development at the Distribution Level: An FNET/GridEye Example

Liu

Zhan

Zhang

et al. 2016

IEEE Trans. Power Delivery

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110

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Electric power grid wide-area monitoring system (WAMS) have been extended from the transmission to distribution level. As the first WAMS deployed at the distribution level, the frequency monitoring network FNET/GridEye uses GPS-timesynchronized monitors called frequency disturbance recorders (FDRs) to capture dynamic grid behaviors. In this paper, the latest developments of monitor design and the state-of-the-art data analytics applications of FNET/GridEye are introduced. Its innovations and uniqueness are also discussed. Thanks to its low cost, easy installation and multi-functionalities, FNET/GridEye works as a cost-effective situational awareness tool for power grid operators and pioneers the development of WAMS in electric power grids.Index Terms-Distribution level, frequency disturbance recorder (FDR), phasor estimation, situational awareness, synchrophasor, wide-area monitoring system (WAMS).

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Dynamic Single-Phase Synchronized Phase and Frequency Estimation at the Distribution Level

Cited by 77 publications

References 22 publications

Phasor Measurement Unit Test Under Interference Conditions

Phasor Measurement Unit Test Under Interference Conditions

Impacts of Power Grid Frequency Deviation on Time Error of Synchronous Electric Clock and Worldwide Power System Practices on Time Error Correction

Wide-Area-Measurement System Development at the Distribution Level: An FNET/GridEye Example

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