Yongli Li

Title: Yongli Li: Innovator in Direct-Current Circuit Breakers

Introduction

Yongli Li is a prominent inventor based in Tianjin, China. He has made significant contributions to the field of electrical engineering, particularly in the development of direct-current (DC) circuit breakers. With a total of 5 patents, his work focuses on enhancing the efficiency and reliability of DC grids.

Latest Patents

One of Yongli Li's latest patents is a source-network coordination type direct-current (DC) circuit breaker based on pre-charged capacitors for modular multilevel converters (MMC) based DC grids. This innovative circuit breaker is designed for a DC grid that includes four converter stations, each equipped with two converters connected in a loop through a double-loop DC overhead line. The design incorporates DC circuit breakers at both ends of each DC line to isolate faults effectively. Additionally, an MMC active voltage adjusting control strategy is utilized to ensure optimal breaking conditions, allowing for quick isolation of fault lines.

Another notable patent is an islanding detection method in DC microgrids based on MPPT trapezoidal voltage disturbance. This method involves starting the MPPT strategy and setting a disturbance threshold. By measuring the output current of photovoltaic arrays (PVA) and calculating environmental factors in real-time, the method can accurately detect islanding conditions. If the PCC voltage exceeds a predetermined threshold, it is classified as islanding; otherwise, further analysis is conducted to determine the nature of the disturbance.

Career Highlights

Yongli Li has worked at prestigious institutions, including Tianjin University and ABB Research Ltd. His experience in these organizations has allowed him to collaborate with leading experts in the field and contribute to groundbreaking research in electrical engineering.

Collaborations

Yongli Li has collaborated with notable colleagues, including Botong Li and Xiaolong Chen. These partnerships have fostered innovation and the exchange of ideas, further enhancing the impact of his work.

Conclusion

Yongli Li is a distinguished inventor whose contributions to the field of direct-current circuit breakers have paved the way for advancements in electrical engineering. His innovative patents and collaborations reflect his commitment to improving the efficiency and reliability of DC grids.