基于输入阻抗调节与变频调制的维也纳整流器输入电流质量宽范围提升控制方法

doi:10.19595/j.cnki.1000-6753.tces.250033

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Abstract The Vienna rectifier is commonly used in power electronic systems to stabilize output voltage and perform power factor correction on the input current, typically employing space vector pulse width modulation (SVPWM). However, SVPWM control requires coordinate transformation, depending on the input filter inductance and the input voltage phase angle to decouple the d- and q-axes. Additionally, the duty cycle calculation using the SVPWM method relies on complex vector region division, which complicates control implementation, especially in systems where parameters such as inductance and capacitance vary with time. Furthermore, under light load conditions and near-zero-crossing points, the input current of the Vienna rectifier may become distorted, reducing current quality and impacting overall system performance.
This paper proposes a novel control method for the Vienna rectifier based on input impedance regulation and variable-frequency modulation. The control laws as follows: $ V_{\text {cdiff }}=k_{\mathrm{pc}}\left(V_{\mathrm{p}}-V_{\mathrm{n}}\right), V_{\text {loop }}=\left(k_{\mathrm{p}}+k_{\mathrm{i}} / s\right)\left(V_{\text {ref }}-V_{\text {out }}\right), D_{\text {onx }}=1-\left|\bar{i}_{\text {La }}+V_{\text {cdiff }}\right| / V_{\text {loop }}$. Firstly, the proposed method achieves output voltage control and capacitor midpoint voltage balancing control using two proportional-integral (PI) controllers. The inner loop determines the duty cycle by dividing the input inductor current by the output of the output voltage control loop, ensuring Z_in_x=0.5V_out/V_loop, which results in a purely resistive input impedance and achieves power factor correction (PFC). The control method is entirely computed within the abc stationary reference frame, eliminating the need for precise input voltage phase angles or filter inductance values, and effectively avoiding the high complexity associated with coordinate transformations and vector region division in traditional SVPWM. Secondly, to mitigate current distortion caused by discontinuous conduction mode (DCM), a variable-frequency modulation strategy is implemented, forcing the rectifier to operate in critical conduction mode (CRM) and minimizing the duration of DCM within each power line cycle. Finally, when the rectifier operates near the zero-crossing points, the switching frequency is adaptively increased to its maximum threshold. After that, due to the limitation of the switching frequency, the rectifier enters DCM. To counteract the nonlinear effects caused by the discontinuity of the inductor current near the zero-crossing points, carrier amplitude compensation is introduced into the control method to suppress zero-crossing distortion. These combined methods improve input current quality across an extended load range, from extreme light load (5% rated power) to full load (100%), with enhancement in maintaining sinusoidal current characteristics under low-power and transitional operating conditions. A 3 kW experimental prototype of the three-phase four-wire Vienna rectifier was developed. Experimental results demonstrate that, under the new control strategy, the total harmonic distortion (THD) of the input current remains below 3% across the entire load range, from 5% to 100%, effectively addressing zero-crossing distortion and improving the quality of light-load current.
In conclusion, the proposed method eliminates dependencies on coordinate transformations, filter parameters, and vector partitioning. Additionally, variable-frequency modulation enhances current quality across extreme load variations. These features simplify the control process, improving the stability of Vienna rectifiers in high power factor and wide load operation scenarios.

Key words： Vienna rectifier power factor correction (PFC) zero-crossing distortion impedance regulation frequency modulation

Received: 08 January 2025

PACS:

TM461.5

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	Jia Guangyu
	Chen Jiawei
	Zhao Teng
	Luo Chao
	Cai Haiqing

Cite this article:

Jia Guangyu,Chen Jiawei,Zhao Teng等. A Wide Range Enhancement Control Method of Input Current Quality of Vienna Rectifier Based on Input Impedance Regulation and Frequency Modulation[J]. Transactions of China Electrotechnical Society, 2026, 41(2): 649-659.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.250033 OR https://dgjsxb.ces-transaction.com/EN/Y2026/V41/I2/649

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