The Plasma Power Supply and Control Engineering Laboratory recently published a groundbreaking paper in the *International Journal of Energy Research* titled "A New Hybrid Filter Based on Differential Current Control Method for Low-Order Harmonic Suppression in Tokamak Power Systems" (DOI: 10.1002/er.3829). This study presents significant advancements in detecting and suppressing low-frequency harmonics, a critical challenge in modern power systems, especially in high-power applications like the Tokamak device.
With the increasing use of non-linear loads, power grids are facing severe harmonic pollution, leading to declining power quality and higher demands for efficient harmonic control. In AC speed control systems using frequency converters, low-frequency harmonics have become a common issue. As the power supply of the Tokamak device is expected to grow significantly in the future, this problem will become even more pronounced, with potentially serious consequences.
Current methods for detecting low-frequency harmonics include DFT/FFT-based window interpolation algorithms and Prony-based techniques. However, these approaches face limitations. The IEC61000-4-7 and GB/T24337-2009 standards emphasize stability and real-time performance, but traditional DFT methods struggle under dynamic conditions. Meanwhile, Prony and its extensions, though theoretically capable of analyzing ultra-low frequencies, require complex matrix operations, precise signal sequencing, and are highly sensitive to noise, making them less reliable in real-world applications.
To address these challenges, the research team developed a novel hybrid filter strategy based on a multi-reference composite vector control algorithm. This approach optimizes control strategies and effectively implements a low-voltage active filter through resonant injection. The solution offers practical technical and engineering references for high-voltage applications, such as 10kV and above.
Supported by the EAST team and funded by the National Natural Science Foundation, this research marks an important step forward in improving power system stability and efficiency. It opens new possibilities for managing harmonic distortions in advanced energy systems.
(Sources: Chinese Academy of Sciences, Baidu Encyclopedia, State Intellectual Property Office)
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