The incorporation of ancillary services on distributed generators (DGs) at utility level has imposed several challenges on the existing distribution networks. To address one of such problem, this paper discusses the impact of ancillary services, mainly the voltage ride through (VRT) capability and active power curtailment control (APCC) of DGs on their anti-islanding protection scheme (AIPS). In this study, different types of load models (viz. ZIP, induction motor (IM) and composite loads) have been considered and non-detection zone (NDZ) characteristics are obtained for a modified IEEE 1547/ UL 1741 test system for analyzing the problem. Further demonstration of this issue has been carried out by conducting time domain simulations in PSCAD/EMTDC platform on modified IEEE 1547 and CIGRE low voltage benchmark test system having composite loads at each of the load buses. Finally, an appropriate mitigation framework has been proposed by incorporating a hybrid islanding detection technique to enable simultaneous implementation of VRT, APCC and AIPS in DGs. The online implementation of the proposed framework is realized in MATLAB/Simulink platform and real-time simulations are performed in OPAL-RT (OP5600) test bed on the modified IEEE 1547/ UL 1741 test system for validating its efficacy.

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分析和缓解辅助服务对分布式发电机的防孤岛保护的影响

公用事业级别的分布式发电机（DG）上的辅助服务的合并给现有的配电网络带来了一些挑战。为了解决这样一个问题，本文讨论了辅助服务的影响，主要是DG的电压穿越（VRT）能力和DG的有功功率削减控制（APCC）对它们的防孤岛保护方案（AIPS）的影响。在这项研究中，已经考虑了不同类型的负载模型（即ZIP负载，感应电机（IM）和复合负载），并且针对经修改的IEEE 1547 / UL 1741测试系统获得了非检测区域（NDZ）特性，以分析问题。通过在PSCAD / EMTDC平台上对修改后的IEEE 1547和CIGRE低压基准测试系统进行时域仿真，对每个问题进行了进一步的演示，其中CIGRE低压基准测试系统在每个负载母线上都具有复合负载。最后，通过引入混合孤岛检测技术，提出了合适的缓解框架，以使DG中的VRT，APCC和AIPS同时实现。所提出框架的在线实现是在MATLAB / Simulink平台上实现的，并且在经修改的IEEE 1547 / UL 1741测试系统上的OPAL-RT（OP5600）测试床上进行了实时仿真，以验证其有效性。DG中的APCC和AIPS。所提出框架的在线实现是在MATLAB / Simulink平台上实现的，并且在经修改的IEEE 1547 / UL 1741测试系统上的OPAL-RT（OP5600）测试床上进行了实时仿真，以验证其有效性。DG中的APCC和AIPS。所提出框架的在线实现是在MATLAB / Simulink平台上实现的，并且在经修改的IEEE 1547 / UL 1741测试系统上的OPAL-RT（OP5600）测试床上进行了实时仿真，以验证其有效性。