An Easy-Implemented Control Method for Three-Phase Single-Stage SWISS Rectifier Considering Phase Compensation and Reduction of Input Current Harmonics
Jiang Weidong, Liu Shengyu, Jiang Haoran, Wang Jinping, Yan Xiaolei
School of Electrical Engineering & Automation Hefei University of Technology Hefei 230009 China
Abstract：As an advanced unity power factor rectifier topology, the SWISS rectifier topology has gradually been applied to medium and high-power applications such as data center power supplies and distributed power systems, owing to its advantages of unity power factor operation and low input current harmonics. It demonstrates significant theoretical research prospects and practical application values. The practical adoption of SWISS rectifiers in industrial applications faces three fundamental technical barriers rooted in control system implementation. First, inherent periodic oscillations in DC-side inductor currents introduce destabilizing factors into control loops, particularly under variable load conditions. These current fluctuations not only degrade output voltage regulation accuracy but also induce higher-order harmonics in input currents through nonlinear interactions with switching operations. Second, the inevitable phase displacement between AC-side voltage and current waveforms caused by input filter capacitors creates a persistent challenge. While the topology theoretically achieves unity power factor, this capacitive reactance-induced phase lag substantially undermines actual power factor performance, especially at partial loads or under distorted grid voltage conditions. Third, the classic dual PI control (CDPIC) architecture necessitates complex coordination between multiple PI regulators, requiring meticulous tuning of cross-coupled control parameters. This multi-variable optimization process becomes increasingly problematic when addressing dynamic load variations and grid disturbances, ultimately limiting the system's operational robustness and scalability in practical engineering scenarios. This study develops a comprehensive control framework through three interconnected technical innovations. By establishing a direct feedforward relationship between instantaneous input current references and measured average currents, the proposed approach effectively decouples the control system from DC-side inductor current perturbations. This strategic decoupling eliminates the need for additional current feedback loops while maintaining precise output voltage regulation through a simplified single PI controller. To counteract the power factor degradation caused by filter capacitors, the methodology incorporates an adaptive phase compensation network that dynamically adjusts current reference waveforms based on real-time grid impedance characteristics. This self-tuning compensation mechanism employs online parameter estimation techniques to maintain optimal phase alignment across varying operational conditions. Furthermore, the control scheme integrates an optimized modulation strategy that synchronizes high-frequency switching patterns with compensated current references, achieving harmonic suppression through intelligent zero-crossing synchronization and selective harmonic elimination principles. The synergistic combination of these elements enables simultaneous improvement in power quality metrics and control system stability without compromising transient response characteristics. Experimental results demonstrate that compared to conventional dual-loop methods, the proposed strategy exhibits marked improvements in both power factor optimization and harmonic suppression. The single-loop architecture substantially reduces algorithmic complexity, while the phase compensation mechanism ensures effective power factor enhancement. The direct current tracking approach significantly strengthens system disturbance rejection capability. Combining control precision with engineering practicality, this method proves particularly suitable for industrial applications demanding stringent dynamic response and operational reliability, such as new energy vehicle charging systems.
姜卫东, 刘圣宇, 姜浩然, 王金平, 严效磊. 一种易于实现的考虑相位补偿和降低输入电流谐波的三相单级型SWISS整流器控制方法[J]. 电工技术学报, 2026, 41(8): 2686-2696.
Jiang Weidong, Liu Shengyu, Jiang Haoran, Wang Jinping, Yan Xiaolei. An Easy-Implemented Control Method for Three-Phase Single-Stage SWISS Rectifier Considering Phase Compensation and Reduction of Input Current Harmonics. Transactions of China Electrotechnical Society, 2026, 41(8): 2686-2696.
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