DC‐link voltage stability analysis for three‐level boost + full‐bridge LLC cascaded converter using impedance modeling

IF 1.8 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Circuit Theory and Applications Pub Date : 2024-07-24 DOI:10.1002/cta.4188

Ruiqi Ma, Shuiyuan He, Chongshan Xie, Xinbo Liu, Jiepin Zhang, Yingtao Ma, Chengwei Kang, Lijun Diao

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引用次数: 0

Abstract

The cascade converter system has been widely concerned along with the medium power operating conditions, and it is crucial to address the intricate interplay among individual modules to ensure stability of both the source and load subsystems. This paper analyzes the DC‐link voltage stability based on impedance matching and proposes a normalized sensitivity calculation method based on the control strategy, which prevents the complex products and matrix calculations of traditional methods. The three‐level boost (TLB) output impedance model is derived based on state‐space averaging for open‐loop and considering the double‐loop, and the full‐bridge LLC (FBLLC) input impedance model is derived based on the fundamental equivalent circuit. Then the effect of the double‐loop PI parameters on the output impedance of the TLB is analyzed in detail based on the normalized sensitivity and verified by the Bode plots. The experimental results of the 30 kW prototype indicate that the control parameters were varied by a factor of 10 compared to the theoretical control group. The most significant alteration was the modification of the kp_i, resulting in an 8.9% increase in the DC‐link voltage ripple, while the ki_v was modified, resulting in a 0.53% increase, indicating that the effects of the PI parameter are consistent with the normalized sensitivity results.

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利用阻抗建模分析三电平升压 + 全桥 LLC 级联转换器的直流链路电压稳定性

随着中等功率运行条件的出现，级联变流器系统受到了广泛关注，解决各个模块之间错综复杂的相互作用以确保源子系统和负载子系统的稳定性至关重要。本文分析了基于阻抗匹配的直流链电压稳定性，并提出了一种基于控制策略的归一化灵敏度计算方法，避免了传统方法中复杂的乘积和矩阵计算。基于开环的状态空间平均并考虑双环，推导出了三电平升压（TLB）输出阻抗模型；基于基本等效电路，推导出了全桥 LLC（FBLLC）输入阻抗模型。然后，根据归一化灵敏度详细分析了双环 PI 参数对 TLB 输出阻抗的影响，并通过 Bode 图进行了验证。30 千瓦原型机的实验结果表明，与理论控制组相比，控制参数变化了 10 倍。最明显的变化是对 kp_i 的修改，导致直流链电压纹波增加了 8.9%，而对 ki_v 的修改则导致纹波增加了 0.53%，这表明 PI 参数的影响与归一化灵敏度结果一致。

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来源期刊

International Journal of Circuit Theory and Applications 工程技术-工程：电子与电气

CiteScore

3.60

自引率

34.80%

发文量

277

审稿时长

4.5 months

期刊介绍： The scope of the Journal comprises all aspects of the theory and design of analog and digital circuits together with the application of the ideas and techniques of circuit theory in other fields of science and engineering. Examples of the areas covered include: Fundamental Circuit Theory together with its mathematical and computational aspects; Circuit modeling of devices; Synthesis and design of filters and active circuits; Neural networks; Nonlinear and chaotic circuits; Signal processing and VLSI; Distributed, switched and digital circuits; Power electronics; Solid state devices. Contributions to CAD and simulation are welcome.