论文标题
虚拟惯性对DC电网稳定性的影响，并具有恒定的功率负载
Impact of Virtual Inertia on DC Grid Stability with Constant Power Loads
论文作者
论文摘要
虚拟惯性是一种有效的控制方法，可在低渗透直流电网中瞬时事件中衰减突然的电压变化。尽管已经提出了实施虚拟惯性的方法，但在存在恒定功率载荷（CPL）的情况下，其对直流电网稳定性的影响尚不清楚。在本文中，我们对通过虚拟惯性增强转换器供电的CPL进行了严格的稳定性分析。我们得出了一个封闭形式的稳定性标准，可用于评估虚拟惯性对系统稳定性的影响，并证明，对于一组系统参数，可以改善DC电网供电CPL的稳定性，以改善一系列虚拟惯用设计。我们为最佳虚拟惯性提供了分析表达式，该惯性提高了稳定性和最大的虚拟惯性，不会导致稳定性恶化。此外，我们提出了一个分步指南，以设计稳定的直流网格，并使用虚拟惯性。提出了测试结果以验证分析。
Virtual inertia is an effective control approach to attenuate sudden voltage changes during transient events in low-inertia DC grids. While methods have been proposed to implement virtual inertia, its impact on DC grid stability in the presence of constant power loads (CPLs) remains unclear. In this paper, we perform a rigorous stability analysis for DC grids with CPLs powered by virtual-inertia-enhanced converters. We derive a closed-form stability criterion that can be used to evaluate the impact of virtual inertia on the system stability, and demonstrate that, given a set of system parameters, the stability of a DC grid powering CPLs can be improved for a range of virtual inertia designs. We provide analytical expressions for the optimal virtual inertia that improves stability and for the maximum virtual inertia that does not deteriorate stability. In addition, we present a step-by-step guideline to design a stable DC grid with virtual inertia. Test results are presented to validate the analysis.
