In a significant stride towards optimizing the integration of renewable energy into power grids, researchers from the State Grid Economic and Technological Research Institute Co., Ltd. in Beijing have developed a novel method to calculate the safe and economic carrying capacity of distributed photovoltaic (PV) systems. This innovative approach, published in the journal *Electric Power Construction*, addresses a critical gap in traditional methods by considering the coordination between transmission and distribution networks, ultimately enhancing the absorption of new energy and ensuring grid reliability.
The study, led by Li Jingru and co-authored by Bai Yu, Wang Xuyang, Song Yi, Zhou Boyu, Guo Yue, and Li Luchang, introduces a two-tiered methodology. At the transmission network level, the researchers constructed a distributed PV capacity interval based on time-series simulations, factoring in varying provincial new energy utilization rates and energy storage configuration ratios. “This allows us to better understand the energy absorption capacity of the transmission network,” explained Li Jingru, the lead author of the study.
At the distribution network level, the team proposed an optimal solution method for distributed PV capacity, considering power flow, power quality, and energy storage constraints. This ensures that the distribution network operates reliably and economically. “By optimizing the investment economy of the distribution network, we can make distributed PV integration more viable and attractive for commercial stakeholders,” added Li.
The researchers conducted case studies in provinces across different regions of China, demonstrating that the distributed PV capacity interval and its optimal solution can meet both the new energy absorption demand of the transmission network and the reliable operation demand of the transmission and distribution networks. This method provides a scientific evaluation of the power grid’s accessible margin, offering a crucial reference for the rational layout of distributed PV systems.
The implications of this research are far-reaching for the energy sector. By incorporating distributed PV into provincial supply-demand calculations and considering the impact of the absorption space of all power sources, this method paves the way for more efficient and reliable integration of renewable energy. “This work is not just about improving grid reliability; it’s about creating a more sustainable and economically viable energy future,” said Li.
The study’s findings are particularly relevant for energy professionals, policymakers, and investors interested in distributed photovoltaic systems, distribution networks, and new energy utilization rates. As the world continues to shift towards renewable energy, this research provides a valuable tool for optimizing grid capacity and ensuring reliable operation.
Published in *Electric Power Construction*, the journal known for its focus on power system planning, design, construction, and operation, this study underscores the importance of coordinated planning between transmission and distribution networks. By bridging this gap, the researchers have made a significant contribution to the field of renewable energy integration, offering a roadmap for future developments in the energy sector.