A proper inverter model is an important tool for system stability analysis and parameter design. A complete model is accurate, but computationally expensive. While some reduced-order models are available, they are inaccurate in certain situations, or lose generality as parameters change. The characteristics of these inverters are significantly different from those of synchronous machines with strong natural timescale separation. Although network dynamics and inner-loop dynamics are relatively fast, they seem to have an impact on power loops with slow dynamics, and neglecting them can lead to questionable results. In this study, the limitations of existing general models are demonstrated, and their applicability is analysed. To address the reduced-order precision problem, a process-simplified reduction method and an efficient reduced-order inverter model are proposed for microgrid applications. The developed model has higher precision and wider applicability while uncovering instability mechanisms and addressing other factors. Finally, the correctness of the theoretical analysis and the validity of the model reduction method are verified by comparative experiments.

中文翻译：

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微电网应用降阶逆变器模型的建模方法及适用性分析

适当的逆变器模型是系统稳定性分析和参数设计的重要工具。完整的模型是准确的，但计算量很大。尽管某些降阶模型可用，但它们在某些情况下不准确，或者随着参数的更改而失去通用性。这些逆变器的特性与自然时间刻度很强的同步电机明显不同。尽管网络动力学和内环动力学相对较快，但它们似乎会对动力学较慢的电源环路产生影响，而忽略它们会导致可疑的结果。在这项研究中，证明了现有通用模型的局限性，并对其适用性进行了分析。为了解决降阶精度问题，针对微电网应用，提出了一种简化过程的简化方法和一种高效的降阶逆变器模型。开发的模型具有更高的精度和更广泛的适用性，同时揭示了不稳定机制并解决了其他因素。最后，通过对比实验验证了理论分析的正确性和模型简化方法的有效性。