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A steady-state analysis tool for unbalanced islanded hybrid AC/DC microgrids

机译：用于不平衡孤岛交流/直流微电网的稳态分析工具

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This paper provides a novel power flow algorithm as a viable tool to accurately analyze the steady-state behavior of islanded hybrid ac/dc microgrids. The operational philosophy of these networks is sophisticated since both the ac frequency and dc voltage are variable, coupled, and sensitive to the control schemes of the distributed generators (DGs) and interlinking converters (ICs). In order to render the analysis generic, mathematical models are developed for control schemes of the DGs and ICs under unbalanced conditions. The presented models are then incorporated into an optimized power flow formulation and the solution is found using the globally convergent Newton-Trust Region (NTR) method. The algorithm accuracy is verified using detailed time-domain simulations in PSCAD/EMTDC environment. The effectiveness of the introduced power flow algorithm is illustrated via two case studies. The first case investigates parallel operation of droop-controlled ICs and highlights the effects of IC settings on load sharing among subgrids and power-transfer sharing through installed ICs. The second case reveals the significance of analyzing the loading condition for each phase of the DGs rather than for the total three-phase power generation, which is commonly followed in steady-state analysis in the reported literature. (C) 2017 Elsevier B.V. All rights reserved.
机译：本文提供了一种新颖的潮流算法作为一种可行的工具，可以准确地分析孤岛式交流/直流微电网的稳态行为。这些网络的操作原理非常复杂，因为交流频率和直流电压都是可变的，耦合的，并且对分布式发电机（DG）和互连转换器（IC）的控制方案敏感。为了使分析具有通用性，针对不平衡条件下的DG和IC的控制方案开发了数学模型。然后将提出的模型合并到优化的潮流公式中，并使用全局收敛的牛顿－托拉斯区域（NTR）方法找到解决方案。使用PSCAD / EMTDC环境中的详细时域仿真，可以验证算法的准确性。通过两个案例研究说明了引入的潮流算法的有效性。第一个案例研究了下垂控制的IC的并行操作，并着重介绍了IC设置对子电网之间的负载共享和通过已安装的IC进行功率传输共享的影响。第二种情况揭示了分析DG的各相而不是总的三相发电的负载条件的重要性，这在所报道的文献中的稳态分析中通常是遵循的。 （C）2017 Elsevier B.V.保留所有权利。

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