In a significant advancement for the field of power electronics, a team of researchers led by Yazhuo Tian from the National Engineering Research Center for Advanced Rolling Intelligent Manufacturing at the University of Science and Technology Beijing has unveiled a groundbreaking model predictive control strategy for three-level neutral point clamped (NPC) rectifier–inverter drive systems. This innovative approach promises to enhance the efficiency and performance of induction motors, a technology widely employed in various construction and industrial applications.
The research, recently published in ‘工程科学学报’ (Journal of Engineering Science), highlights the growing importance of three-level converters, which are recognized for their superior output power quality and high power factor. The dual pulse width modulation frequency speed control system, characterized by its rectifier–inverter structure, has garnered attention due to its advantages, including bidirectional energy flow and controllable intermediate direct current (DC) voltage. These features are particularly relevant for construction equipment and machinery, where energy efficiency is paramount.
Tian’s team has developed a sophisticated prediction and loss model that integrates multiple control objectives into a unified cost function. This novel model predictive control strategy operates without the need for weighting factors, a common challenge in traditional control methods. “By introducing the DC bus midpoint voltage and converter switching frequency control into our model, we have created a more versatile and efficient control system,” Tian explained. This approach allows for adaptive parallel optimization, enabling the system to select the optimal switching state and improve overall performance.
The implications of this research extend beyond theoretical advancements. In the construction sector, where operational efficiency directly impacts project costs and timelines, the ability to reduce midpoint voltage bias and switching frequency can lead to significant energy savings. Furthermore, the reduction of total harmonic distortion enhances power quality, making it not only beneficial for machinery but also for the overall electrical infrastructure of construction sites.
The results from simulations and experiments conducted by Tian and his colleagues demonstrate that this new strategy can markedly improve both the steady-state and dynamic performance of rectifier–inverter systems. “Our findings indicate that this control method can effectively balance the midpoint voltage and reduce switching losses, which is crucial for maintaining the longevity and reliability of construction machinery,” Tian noted.
As the construction industry increasingly turns to automation and advanced technologies, innovations like this one will play a critical role in shaping the future landscape. By enhancing the efficiency of power conversion systems, this research aligns with the industry’s push for sustainable practices and reduced operational costs.
For those interested in exploring this research further, the findings are detailed in ‘工程科学学报’, which translates to the Journal of Engineering Science. For more information about Yazhuo Tian and his work, you can visit the National Engineering Research Center for Advanced Rolling Intelligent Manufacturing at the University of Science and Technology Beijing [here](http://www.ustb.edu.cn).
