Thanks to its fast self-synchronization capability, the virtual oscillator control (VOC) has become an emerging control technique for grid-connected inverters, especially in single-phase applications. Nevertheless, the nonlinearity of VOC inverters impacts its dynamic behavior, and there is a trade-off between the system stability and accurate power regulation in VOC-based microgrids. This paper studies the dynamic stability of VOC inverters for guiding the parameter design. Then, based on the analysis result, an improved VOC strategy with hybrid power regulation structure is proposed for improving both the system stability and power regulation of VOC-based microgrids. First, a dynamic phasor (DP) model of single-phase VOC-based microgrids with multiple control loops is developed. Second, a stability region analysis of VOC parameters is performed, the proper mode setting and robust parameter design of VOC inverters are provided. Third, the improved VOC strategy is presented, achieving accurate power sharing, fast voltage recovery and adequate stability margin. The proposed parameter design and improved VOC strategy are validated by simulation and hardware-in the-loop experiment.

中文翻译：

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基于单相虚拟振荡器的微电网动态稳定性改善和精确功率调节


由于其快速自同步能力，虚拟振荡器控制（VOC）已成为并网逆变器的新兴控制技术，特别是在单相应用中。然而，VOC逆变器的非线性影响了其动态行为，并且基于VOC的微电网中的系统稳定性和精确功率调节之间存在权衡。本文研究VOC逆变器的动态稳定性，以指导参数设计。然后，基于分析结果，提出了一种混合功率调节结构的改进VOC策略，以提高基于VOC的微电网的系统稳定性和功率调节。首先，开发了具有多个控制回路的单相基于 VOC 的微电网的动态相量 (DP) 模型。其次，对VOC参数进行了稳定区域分析，提供了VOC逆变器的正确模式设置和鲁棒参数设计。第三，提出了改进的VOC策略，实现了精确的功率分配、快速的电压恢复和足够的稳定裕度。所提出的参数设计和改进的 VOC 策略通过仿真和硬件在环实验进行了验证。