Challenges for Loss-of-Mains Protection System in Inverter-Based Resources Applications

2021 Brazilian Power Electronics Conference (COBEP) Pub Date : 2021-11-07 DOI:10.1109/COBEP53665.2021.9684090

Andrei da Cunha Lima, Anderson Luis do N. Severo, Luiz Fernando R. Menegazzo, L. Michels, Catherine Marquioro de Freitas, Fabricio Andrade Mourinho, Igor Antônio B. de Bitencourt

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引用次数: 1

Abstract

Ahstract-Loss-of-mains (LoM) or anti-islanding utility protection has been one of main concerts in Inverter-based Resources (IBR) applications. Nowadays, many LOM detection methods have been designed to be excessively sensitive to comply with some standards requirements which only accept tight non-detection zones (NDZ). As a result, false islanding detection events has been often observed resulting in undesirable IBR disconnections. On the other hand, recent grid -connection stan-dards have included some immunity requirements to avoid false islanding detections since they can result in electric grid. This paper presents an experimental evaluation of the immunity of some commercial IBR under different grid disturbances such as power frequency drifts and voltage sags. It was considered for this evaluation some grid-connected photovoltaic inverters which comply with Brazilian standard NBR 16149. Results show that some commercial equipment disconnect under normal voltage/frequency grid oscillations. Therefore it is demonstrated that Brazilian standards for IBR may consider additional tests to improve the resilience of the electric system.

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基于逆变器的资源应用中失电保护系统的挑战

摘要:在基于逆变器的资源(IBR)应用中，市电损耗(LoM)或防孤岛保护一直是一个主要的应用领域。目前，许多LOM检测方法被设计得过于敏感，以满足一些标准的要求，这些标准只接受严格的非检测区(NDZ)。因此，经常观察到错误的孤岛检测事件，导致不希望的IBR断开。另一方面，最近的电网连接标准包含了一些抗扰度要求，以避免误岛检测，因为它们可能导致电网。本文对一些商用IBR在不同电网干扰(如工频漂移和电压跌落)下的抗扰性进行了实验评估。本次评估考虑了一些符合巴西标准NBR 16149的并网光伏逆变器。结果表明，一些商用设备在正常电压/频率的电网振荡下断开。因此，巴西的IBR标准可以考虑额外的测试，以提高电力系统的弹性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2021 Brazilian Power Electronics Conference (COBEP)

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