Performance Analysis of the Overcurrent Protection for the Renewable Distributed Generation Dominated Microgrids

Khan, Asif; Hong, Qiteng; Booth, Campbell

doi:10.1109/tensymp50017.2020.9230583

Cited by 2 publications

(1 citation statement)

References 11 publications

(8 reference statements)

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“…The non-unified and limited fault currents from CBRs can pose severe challenges to the reliable operation of existing AC protection devices. For example, as reported in [3] - [5], the connection of CBRs can lead to a range of protection system issues, such as the failed detection and/or coordination of overcurrent protection, the under/over-reach and phase selection of distance protection, and the failed operation of the differential protection during internal faults.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of travelling wave protection performance in converter-dominated networks

Liu,

Hong,

Dyśko

et al. 2024

17th International Conference on Developments in Power System Protection (DPSP 2024)

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This paper presents a comprehensive study to investigate the travelling wave protection performance in networks with high penetration of Converter-Based Resources (CBRs). Representative network models are developed in the sub-step environment of the Real-Time Digital Simulator (RTDS) and realistic Hardware-in-the-Loop (HiL) tests are conducted on a pair of travelling wave relays (TWRs) to emulate realistic system and fault scenarios. The studies have been conducted in two stages: firstly, systematic tests with a total number of 300 cases have been conducted to have a high-level assessment of TWRs' performance under different fault conditions, e.g. varied fault types, fault positions, Fault Inception Angles (FIAs), and fault resistances; and secondly, detailed investigation has been conducted on selected and representative cases to understand the impact of various factors, e.g. the line-end transformer, system fault levels, converter controls and external faults, on the protection performance. Based on the test results and analysis, it was found that the performance of the TWR is largely unaffected by the variation of system fault levels and converter control strategies, but the connection of the line-end transformer and the low FIAs present challenges for the healthy operation of TWRs in some conditions. Although the tests were conducted for a pair of specific commercially available TWRs, the results have been analysed in a generic manner, so the findings will not only facilitate understanding the benefits/limitations of travelling wave protection in the network with high amounts of CBRs, but also provide a valuable reference for system operators to select the protection solutions in the future.

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Section: Introductionmentioning

confidence: 99%

Evaluation of travelling wave protection performance in converter-dominated networks

Liu,

Hong,

Dyśko

et al. 2024

17th International Conference on Developments in Power System Protection (DPSP 2024)

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Comparative Evaluation of Dynamic Performance of a Virtual Synchronous Machine and Synchronous Machines

Khan¹,

Hong²,

Liu³

et al. 2021

The 9th Renewable Power Generation Conference (RPG Dublin Online 2021)

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Increasing penetration of converter-interfaced renewable generation has led to significant operational challenges for power systems. Such challenges are mainly caused by the different capabilities and dynamic responses of the converters compared with synchronous machines, e.g. converters do not naturally provide inertia to the system and contribute limited fault level with very different fault characteristics. Virtual Synchronous Machines (VSM) and Synchronous Condensers (SCs) are both considered as promising solutions to address the challenges in operating converter-dominated power systems. This paper presents comprehensive studies for evaluating and comparing the dynamic performance of VSM, SC and Synchronous Generators (SGs), under a range of grid contingency events, which include short circuit faults, frequency disturbances, voltage depression, etc. The studies aim to offer insights on the level of support VSMs can offer to the system as compared with SCs and SGs, and their advantages, potential issues and limitations that need to be considered for a wider application in the system. From the studies, it is found that the VSM system appears to have comparable performance and support to the system from the perspective of fault ride through (FRT), provision of inertial response and reaction to voltage steps. However, while VSM can potentially provide a fast fault current injection through the implementation of appropriate control, a key limitation is on the magnitude of fault currents, so it is unlikely to be capable of offering the same level of support compared with SCs and SGs.

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Performance Analysis of the Overcurrent Protection for the Renewable Distributed Generation Dominated Microgrids

Cited by 2 publications

References 11 publications

Evaluation of travelling wave protection performance in converter-dominated networks

Evaluation of travelling wave protection performance in converter-dominated networks

Comparative Evaluation of Dynamic Performance of a Virtual Synchronous Machine and Synchronous Machines

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