In the bustling world of urban rail transit, a novel approach to integrating photovoltaic (PV) technology with metro systems is gaining traction, promising to revolutionize how we power our trains and manage energy more efficiently. At the forefront of this innovation is LI Hongbo, whose research, published in the journal *Control and Automation*, introduces a cutting-edge power conversion system that could significantly impact the energy sector.
LI Hongbo’s study focuses on combining a PV system with an energy storage unit to feed directly into the DC traction grid of metro systems. This approach aims to reduce energy loss during transmission and conversion, a common challenge in current setups where PV systems are typically connected to AC power systems for lighting. “By directly connecting the PV system to the DC traction grid, we can minimize energy loss and improve overall efficiency,” LI Hongbo explains.
The proposed system includes a quasi-Z source network-based PV system and a high conversion ratio energy storage circuit. This design allows the energy storage unit to absorb excess photovoltaic power and recycle the regenerative braking energy of trains. “This not only enhances energy utilization but also contributes to peak load shaving, a critical aspect of managing energy demand,” adds LI Hongbo.
One of the standout features of this research is the modulation strategy for energy storage converters. This strategy reduces the total voltage of energy storage components to a quarter or less of the DC traction grid voltage. “This reduction in voltage significantly decreases the number of energy storage components needed, thereby lowering the risk of premature failure due to overcharging or undercharging of individual units,” LI Hongbo notes.
The implications of this research are far-reaching. For the energy sector, this innovation could lead to more efficient and reliable energy management in urban rail transit systems. By reducing energy loss and improving the utilization of regenerative braking energy, metro systems could become more sustainable and cost-effective. Additionally, the modulation strategy could pave the way for more robust and durable energy storage solutions, addressing a significant challenge in the energy storage industry.
As urbanization continues to grow, the demand for efficient and sustainable urban rail transit systems will only increase. LI Hongbo’s research offers a promising solution that could shape the future of urban transportation and energy management. With further development and implementation, this technology could become a cornerstone of modern metro systems, contributing to a greener and more efficient urban landscape.
The research was published in *Control and Automation*, a journal that has been a staple in the field of control engineering and automation for decades. This publication underscores the significance of LI Hongbo’s work and its potential to influence future developments in the energy sector. As the world moves towards more sustainable energy solutions, innovations like these will be crucial in driving progress and achieving a more energy-efficient future.