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Stability Analysis of PV Generators With Consideration of P&O-Based Power Control

机译：考虑基于P＆O的功率控制的光伏发电机稳定性分析

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摘要

Photovoltaic (PV) generators have continuously increased in recent years, whose power is usually controlled through the perturbation and observation (P&O) method. In essence, the P&O method is nonlinear and discontinuous. Hence, the conventional small-signal stability analysis is not suitable anymore when the influence of the P&O-based power control is considered. Focusing on this problem, this paper adopts the nonlinear describing function (DF) method to conduct the accurate stability analysis of PV generators with consideration of P&O-based power control. The detailed procedures about the DF method are introduced, and then the related influence factors like perturbation size, filters, and so on are analyzed quantitatively. Furthermore, the comparison with the conventional stability analysis methods is made, which suggests that the DF method can effectively enhance the accuracy of the stability analysis. All the conclusions are verified by the real-time hardware-in-loop tests.
机译：近年来，光伏（PV）发电机不断增加，其功率通常通过扰动和观测（P＆O）方法进行控制。本质上，P＆O方法是非线性且不连续的。因此，当考虑基于P＆O的功率控制的影响时，常规的小信号稳定性分析不再适用。针对这一问题，本文采用非线性描述函数（DF）方法，在考虑基于P＆O的功率控制的基础上，对光伏发电机进行了精确的稳定性分析。介绍了有关DF方法的详细步骤，然后定量分析了相关影响因素，如扰动大小，滤波器等。此外，与传统的稳定性分析方法进行了比较，这表明DF方法可以有效地提高稳定性分析的准确性。所有的结论都通过实时的硬件在环测试得到了验证。

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