Active-Reactive Power Coordination Optimization Strategy for Photovoltaic High-Penetration Distribution Networks Considering SOP Operational Lifetime Degradation
Gao Yuan1, Hong Lucheng1, Lu Ying2, Wu Minghe1, Zhou Aihua3
1. Southeast University Nanjing 210096 China 2. Aiswei Technology Co., Ltd Shanghai 200000 China 3. China Electric Power Research Institute Nanjing 210096 China
摘要 智能软开关（Soft Open Point, SOP）作为柔性调控关键设备深度参与配电网优化运行,其内部关键器件（IGBT与电容器）在频繁功率调节过程中承受复杂热-电应力,进而导致寿命损耗累积和系统可靠性下降。为此,本文提出了计及SOP寿命损耗的光伏高渗透配电网有功-无功协同优化策略。首先,分析SOP内部 IGBT 与电容器对系统运行寿命的影响,构建基于任务剖面的疲劳损伤量化评估方法;其次,考虑任务剖面不确定性对寿命评估精度的影响,引入CWGAN-GP 模型生成寿命损伤场景,提出基于CWGAN-GP的寿命量化评估方法;在此基础上,引入寿命损伤影响因子,建立计及寿命约束的配电网有功-无功协同优化模型,实现SOP高可靠参与配电网优化运行;最后,在 IEEE 33节点系统上对所提策略进行验证,结果表明所提策略在寿命损伤影响因子由1.0调整至0.6时,SOP中关键器件最小寿命由5.79年显著提升至23.96年,SOP整体寿命得到有效延长,为配电网SOP寿命约束下的优化运行提供有效参考。
Abstract：With the implementation of the "dual carbon" goals and the development of new power systems, the installed capacity of renewable energy sources such as photovoltaics and wind power in China has reached new highs, contributing to the construction of a low-carbon, efficient, and sustainable power system. As a high proportion of distributed energy sources are integrated into the distribution network through power electronic devices, the distribution network is gradually exhibiting significant characteristics of power electronics. In a power electronicized distribution network, large numbers of inverters, rectifiers, and other devices can precisely control and regulate the grid, effectively addressing issues such as reverse power flow, increased network losses, line overloads, and voltage violations. Firstly, analyze the impact of key power electronic devices (IGBTs, capacitors) on the lifetime of SOP (Standard Operating Procedures) and propose a method for quantifying SOP fatigue damage evaluation based on the distribution network mission profile. Secondly, considering the impact of mission profile uncertainty on the accuracy of SOP lifetime evaluation, use the CWGAN-GP model to characterize the uncertainty in SOP fatigue damage scenarios and propose a distribution network SOP lifetime quantification evaluation method based on the CWGAN-GP model. This provides a theoretical basis for considering SOP lifetime in the optimization of distribution network operations. Finally, introduce an SOP lifetime damage influence factor and establish an active-reactive power coordination optimization model for photovoltaic high-penetration distribution networks that accounts for SOP lifetime loss, enabling SOPs to participate in the optimization of distribution network operations with high reliability. Simulation results on the IEEE 33-bus test system show that, the fatigue damage scenarios of IGBT devices generated by the CWGAN-GP are almost identical to the CDF (Cumulative Distribution Function) of the real historical device lifetime damage scenarios, indicating that the generated device lifetime damage scenarios not only effectively capture the output characteristics of historical device lifetime damage data but also follow the correct statistical distribution pattern. The SOP lifetime damage influence factors were set to 0.6, 0.7, 0.8, and 0.9, respectively. As the lifetime damage influence factor decreases, the stability of the IGBT and capacitors significantly deteriorates. However, while extending the SOP lifetime, the operational losses in the distribution network also increase. Therefore, it is evident that a balance must be struck between extending the SOP lifetime and reducing distribution network losses, ultimately determining an optimal SOP lifetime damage influence factor that ensures the long-term stable operation of the SOP while optimizing the operational efficiency of the distribution network. The following conclusions can be drawn from the simulation analysis: 1) A method for quantifying SOP fatigue damage based on the distribution network mission profile is proposed, calculating device fatigue using thermal load and lifetime models. 2) A photovoltaic high-penetration distribution network SOP lifetime evaluation method considering mission profile uncertainty is proposed. The CWGAN-GP model is used to characterize mission profile uncertainty, achieving precise reliability assessment of the SOP. 3) An active-reactive power coordination optimization strategy for photovoltaic high-penetration distribution networks considering SOP lifetime loss is proposed. The lifetime of key devices in SOP is significantly improved, enabling highly reliable SOP participation in distribution network operation.
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