Generalized average modeling of DC subsystem in solid state transformers
Generalized average modeling of DC subsystem in solid state transformers
复制标题
固态变压器直流子系统的广义平均建模
DOI：
10.1109/ecce.2017.8095992
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
J. Kimball
中科院分区：
文献类型：
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作者：
Jacob A. Mueller;J. Kimball
固态变压器(SST)包括直流子系统，支持即插即用地支持直流负载、发电源和能量存储。对于SST中的一次能量转换和负载接口应用，双有源桥(DAB)变流器是一种合适的拓扑结构。这项研究考虑了一种将DAB转换器用于两种应用的SST，并描述了一种生成DC子系统的完整模型的方法。系统级模型由单个变流器的广义平均模型构成，因此保留了与DAB的交流级和直流级有关的信息。通过在模型组合过程中保持关键状态方程的解耦来限制最终模型的大小，从而避免了广义平均建模技术中涉及的可扩展性问题。通过与硬件试验台结果的比较，验证了模型的准确性。该模型的主要应用是为小干扰稳定性评估提供一个框架，无论SST中的功率流动如何，该框架都适用。虽然本研究中使用的方法是受SST应用的启发，但它们也适用于更一般的直流配电系统。
Solid state transformers (SSTs) include dc subsystems to enable plug-and-play support of dc loads, generation sources, and energy storage. Dual active bridge (DAB) converters are a suitable topology for both the primary energy conversion and load interface applications in an SST. This study considers an SST that uses DAB converters for both applications, and describes a method of generating a full model of the dc subsystem. The system-level model is constructed from generalized average models of the individual converters and therefore retains information related to both the ac and dc stages of the DABs. The size of the resulting model is limited by preserving the decoupling of key state equations in the model combination process, thereby avoiding the scalability issues involved in generalized average modeling techniques. The accuracy of the model is verified through comparisons to results from a hardware testbed. The primary application of the model is to provide a framework for small-signal stability assessment that is applicable regardless of the flow of power in the SST. While the methods used in this study are motivated by the SST application, they are also suitable to the more general case of a dc distribution system.