Improving frequency and ROCOF accuracy during faults, for P class phasor measurement units
Abstract—Many aspects of Phasor Measurement Unit (PMU) performance are tested using the existing (and evolving) IEEE C37.118 standard. However, at present the reaction of PMUs to power network faults is not assessed under C37.118. Nevertheless, the behaviour of PMUs under such conditions may be im...
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| 格式: | Thesis |
| 语言: | English |
| 出版: |
2014
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| 主题: | |
| 在线阅读: | http://eprints.utem.edu.my/id/eprint/15285/1/Improving%20Frequency%20and%20ROCOF%20Accuracy%20During%20Faults%2C%20for%20P%20Class%20Phasor%20Measurement%20Units.pdf |
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| 总结: | Abstract—Many aspects of Phasor Measurement Unit (PMU)
performance are tested using the existing (and evolving) IEEE C37.118 standard. However, at present the reaction of PMUs to power network faults is not assessed under C37.118.
Nevertheless, the behaviour of PMUs under such conditions may be important when the entire closed loop of power system
measurement, control and response is considered. This paper
presents ways in which P class PMU algorithms may be
augmented with software which reduces peak frequency
excursions during unbalanced faults by factors of typically
between 2.5 and 6 with no additional effect on response time, delay or latency. Peak ROCOF excursions are also reduced. In addition, extra filtering which still allows P class response requirements to be met can further reduce excursions, in particular ROCOF. Further improvement of triggering by using midpoint taps of the P class filter, and adaptive filtering, allows peak excursions to be reduced by total factors of between 8 and 40 (or up to 180 for ROCOF), compared to the C37.118 reference
device. Steady-state frequency and ROCOF errors during
sustained faults or unbalanced operation, particularly under
unbalanced conditions, can be reduced by factors of hundreds or thousands compared to the C37.118 reference device. |
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