期刊
IEEE TRANSACTIONS ON POWER DELIVERY
卷 36, 期 6, 页码 3299-3308出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2020.3038258
关键词
Substations; Delay effects; Computational efficiency; IEC Standards; Delays; Time-frequency analysis; Time-domain analysis; Computational cost; delay estimation; field programmable gate arrays; finite impulse response filters; power system protection; signal analysis; substation automation
资金
- Energimyndigheten [43010-2]
This paper proposes a distributed signal processing approach that allocates filtering operations to standalone merging units to integrate high sampling rate signals at the process level. A decimation filter design is presented to provide signal sequences with high, medium, and low sampling rates according to the requirements of the protection function.
Travelling wave based protection functions require significantly higher sampling rates than protection functions based on time-domain superimposed quantities or fundamental frequency phasors. Integrating these high sampling rates in digital substations leads to a significant increase of the communication load of process-level networks and causes high computational cost for centralized protection systems. This paper builds on a distributed signal processing approach, which allocates the filtering operations among standalone merging units (SAMU). In particular, the paper presents a decimation filter design to integrate signals with high sampling rates at the process-level. Thereby, signal sequences with high, medium and low sampling rates are provided according to the requirements of the respective protection function. The decimation filter structure is optimized with respect to time delay by the Remez exchange algorithm and with respect to computational cost by a multistage approach and a sparse filter design algorithm. In addition, the filter response is verified against the accuracy constraints defined in IEC 61869-6 and IEC 61869-13. The paper shows that it is feasible to distribute the filtering operations among SAMUs, while keeping the time delay below the maximum allowable processing delay of 2 ms.
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