This inventor holds 1 USPTO granted patent. Top assignee: Wuhan University. Active years: 2021.
Company Filing History:
Years Active: 2021
Title: Innovations of Qizhen Li in Power Systems
Introduction
Qizhen Li is a notable inventor based in Hubei, China. He has made significant contributions to the field of power systems, particularly in the area of inverter technology. His work focuses on addressing challenges related to inter-harmonics control, which is crucial for maintaining the stability of power systems.
Latest Patents
Qizhen Li holds a patent for a "Generalized pulse width modulation technique for specific inter-harmonics control of the inverters." This innovative technique provides a PSR-PWM method for high power active front-end inverters. It aims to dampen specific inter-harmonics that may lead to sub-synchronous resonance in power systems. The patent addresses the strong interactions between various power converters, such as wind power and photovoltaic converters, as well as FACTS devices and HVDC transmission. These interactions can result in low-frequency oscillations ranging from a few Hz to dozens of Hz, and even high-frequency oscillations between 300-2000 Hz. Additionally, low-frequency oscillations from 0.6 Hz to 7 Hz are prevalent in the power supply systems of many electric locomotives. Such oscillations can disrupt locomotive dispatching systems, especially during large-scale train outages. Furthermore, the patent highlights the impact of high-power furnaces and other nonlinear loads in industrial settings, which can cause voltage disturbances and flicker within a passband inter-harmonic frequency of 0.05 Hz-90 Hz.
Career Highlights
Qizhen Li is affiliated with Wuhan University, where he continues to advance research in power systems and inverter technology. His work has garnered attention for its practical applications in improving the reliability and efficiency of power systems.
Collaborations
He collaborates with esteemed colleagues, including Lei Xu and Yigang He, who contribute to his research endeavors and innovations in the field.
Conclusion
Qizhen Li's contributions to power systems through his innovative patent demonstrate his commitment to enhancing the stability and efficiency of electrical systems. His work is vital for addressing the challenges posed by modern power generation and distribution.