Global Optimality of Inverter Dynamic Voltage Support
Global Optimality of Inverter Dynamic Voltage Support
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DOI：
10.1109/tpwrs.2021.3133715
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发表时间：
2021-06
影响因子：
6.6
通讯作者：
Yifei Guo;B. Pal;R. Jabr;H. Geng
中科院分区：
文献类型：
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作者：
Yifei Guo;B. Pal;R. Jabr;H. Geng
研究了在电压暂降情况下逆变器资源的动态电压支持（DVS），以提高系统的低电压穿越性能。的DVS问题制定为一个非凸优化程序，最大化的正序电压幅值在公共耦合点（PCC）的电流，有功功率，同步稳定性约束。然后，我们进行最优性分析，探索全局最优分析。研究发现，唯一的全局最优有三个场景/阶段（S1-S3），这取决于电网电压，电网强度和IBRs的物理限制之间的特定关系。给出了S1和S3中的显式封闭解，并给出了S2的最优性条件（隐式解），保证了全局最优性，并与快速实时控制兼容.最后，我们实现了最佳的并网单级光伏（PV）发电厂通过集成DVS控制器。在不同的场景下进行了动态仿真，以测试我们的建议。对模型误差的鲁棒性也进行了讨论。
This paper investigates the dynamic voltage support (DVS) from inverter-based resources (IBRs) under voltage sags to enhance the low-voltage ride-through performance. The DVS problem is formulated as a nonconvex optimization program that maximizes the positive-sequence voltage magnitude at the point of common coupling (PCC) subject to the current, active power, and synchronization stability constraints. Then, we perform the optimality analysis to explore the global optimum analytically. It is found that the unique global optimum has three scenarios/stages (S1–S3), which depends on the specific relationship among grid voltage, grid strength, and physical limits of IBRs. The explicit closed-form solutions in S1 and S3 are derived, and the optimality conditions (an implicit solution) of S2 are provided, which guarantees the global optimality and enables the compatibility with fast real-time control. Finally, we implement the optimum with a grid-connected single-stage photovoltaic (PV) power plant by integrating a DVS controller. Dynamic simulations are carried out under different scenarios to test our proposal. The robustness against model errors is also discussed.