Steady-State and Small-Signal Analysis of A-Source Converter
Steady-State and Small-Signal Analysis of A-Source Converter
复制标题
A源变换器的稳态和小信号分析
DOI：
10.1109/tpel.2017.2756626
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发表时间：
2018
影响因子：
6.7
通讯作者：
F. Blaabjerg
中科院分区：
文献类型：
--
作者：
A. Ayachit;Y. Siwakoti;V. Galigekere;M. Kazimierczuk;F. Blaabjerg
本文对脉宽调制a源变换器的功率级进行了详细的稳态分析和交流小信号建模。详细介绍了电压和电流波形及其描述变换器工作的表达式。确定输入到输出和输入到电容的直流电压传递函数。导出了保证连续导通模式所需的最小电感。给出了半导体器件应力的表达式。利用电路平均技术推导出直流平均等效电路。给出了包括变换器寄生电阻在内的小信号模型的完整推导，然后给出了与电容电压环相关的功率级传递函数，例如：1)占空比到电容电压；2)输入到电容的电压。此外，还推导了网络输入阻抗和输出阻抗的表达式。最后，对a源变换器的实验室样机进行了小信号模型的频域和时域实验验证。在较宽的频率范围内，理论预测与实验结果吻合较好。
This paper presents a detailed steady-state analysis and ac small-signal modeling of the power stage of pulse-width modulated A-source converter. The voltage and current waveforms along with their corresponding expressions describing the converter operation are presented in detail. The input-to-output and input-to-capacitor dc voltage transfer functions are determined. The minimum inductance required to ensure continuous conduction mode is derived. The expressions for the semiconductor devices stresses are also presented. The dc, averaged equivalent circuit is derived using the circuit averaging technique. A complete derivation of the small-signal model including the converter parasitic resistances are presented followed by the power stage transfer functions relevant to the capacitor voltage loop, such as: 1) duty cycle-to-capacitor voltage; and 2) input-to-capacitor voltage. In addition, the expressions for the network input impedance and output impedance are derived. Finally, experimental validations of the derived small-signal models are performed, both in frequency and time domain for a laboratory prototype of an A-source converter. The theoretical predictions were in good agreement with the experimental results over a wide range of frequencies.