This article presents a comprehensive design procedure for isolated microgrids with a high penetration of nonlinear loads. The proposed microgrid planning approach simultaneously determines the sizes, locations and types of distributed generators (DGs) and shunt capacitor banks (CBs). The presence of nonlinear loads along with the capacitors of CBs or DGs’ output filters may cause severe voltage distortions. To consider this issue, a harmonic power flow tool tailored for planning applications is developed that takes into account the specific features of isolated microgrids. Given the necessity of supply continuity for isolated microgrids after a contingency, the proposed planning approach takes into consideration the reliability to increase the probability of building successful islands. Unlike previous methods, the proposed approach does not rely merely on supply adequacy, and takes into account the fact that the voltage provision requirement can only be fulfilled through dispatchable DGs. The intermittent natures of loads and renewable DGs are modelled probabilistically. The effectiveness of the proposed planning approach has been validated using the PG&E 69-bus system, and the followings are observed: 1) the significance of applying suitable fundamental-power-flow and harmonic-power-flow algorithms for isolated microgrids, and 2) the possibility of avoiding a severe voltage distortion by utilizing an appropriate planning method and only small increase in the cost.

中文翻译：

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带有非线性负载的隔离微电网中分布式发电机和并联电容器的优化规划

本文介绍了具有高穿透力的孤立微电网的全面设计程序。拟议的微电网规划方法可同时确定分布式发电机（DG）和并联电容器组（CB）的大小，位置和类型。非线性负载以及CB或DG输出滤波器的电容器可能会导致严重的电压失真。为了考虑这个问题，开发了一种为计划应用量身定制的谐波潮流工具，其中考虑了隔离微电网的特定功能。考虑到在意外情况发生后，需要为孤立的微电网提供连续性，建议的规划方法考虑了可靠性，以增加建造成功孤岛的可能性。与以前的方法不同 提出的方法不仅仅依赖于供电充足性，而且考虑到只能通过可调度DG满足电压提供要求的事实。负载和可再生DG的间歇性是通过概率建模的。使用PG＆E 69总线系统验证了所提出的规划方法的有效性，并观察到以下几点：1）对隔离的微电网应用适当的基本潮流算法和谐波潮流算法的重要性，以及2）通过使用适当的计划方法避免严重的电压失真的可能性，而成本仅增加很少。负载和可再生DG的间歇性是通过概率建模的。使用PG＆E 69总线系统验证了所提出的规划方法的有效性，并观察到以下几点：1）对隔离的微电网应用适当的基本潮流算法和谐波潮流算法的重要性，以及2）通过使用适当的计划方法避免严重的电压失真的可能性，而成本仅增加很少。负载和可再生DG的间歇性是通过概率建模的。使用PG＆E 69总线系统验证了所提出的规划方法的有效性，并观察到以下几点：1）对隔离的微电网应用适当的基本潮流算法和谐波潮流算法的重要性，以及2）通过使用适当的计划方法避免严重的电压失真的可能性，而成本仅增加很少。