Introduction

Intermittent solar energy causes different operational modes of power converters including continuous current modes (CCMs) and discontinuous current modes (DCMs), which need appropriate control strategies and parameters assignment to ensure the functionality of the overall solar energy power generation system. Hence, it is important to identify suitable operation modes for a high-order converter system. However, for a high-order power converter (HOPC), traditional time-domain analysis method and bifurcation analysis are inapplicable, since this requires comprehensive analysis and sophisticated control design.

Objectives

To improve reliability and reduce mathematical complexity, this paper focuses on the operation mode derivation of HOPCs to well identify its boundary conditions and provide industry standards for converter applications.

Methods

With complex operation modes, 3-Z-network converter is analysed as a typical example and its derivations of boundary conditions are elaborated. In detail, the equilibrium points and boundary conditions of each operation modes are first derived; then with the guidance of boundary conditions, unexpected operation modes can be avoided by parameters reassignment.

Results

Simulations and experimentation on the newly established system prototype are conducted to validate the effectiveness of the proposed approach. It demonstrates that the theoretical and experimental boundary conditions are in good agreement.

Conclusion

This paper provides equilibrium points and boundary conditions, and obtains deeper insights into the behaviors of the 3-Z-network converter. The derivations of four operation modes and the boundary condition of each mode has been conducted and provided for the large-signal averaged model of the converter, which provides guidance for engineers to adjust the system parameters so as to realize required operation modes. Simulation and experimentation have verified the accuracy and effectiveness of the proposed identified operation boundaries.

中文翻译：

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高阶功率变换器工况识别新方法

介绍

间歇性太阳能导致功率转换器的不同工作模式，包括连续电流模式（CCM）和不连续电流模式（DCM），需要适当的控制策略和参数分配来确保整个太阳能发电系统的功能。因此，为高阶转换器系统确定合适的操作模式非常重要。然而，对于高阶功率变换器（HOPC），传统的时域分析方法和分岔分析是不适用的，因为这需要全面的分析和复杂的控制设计。

目标

为了提高可靠性并降低数学复杂性，本文重点研究 HOPC 的运行模式推导，以很好地识别其边界条件并为转换器应用提供行业标准。

方法

以复杂的工作模式为例，以3-Z网络转换器为例进行了分析，并详细阐述了其边界条件的推导。详细地，首先导出了每种运行模式的平衡点和边界条件；然后在边界条件的指导下，通过参数重新分配可以避免意外的操作模式。

结果

对新建立的系统原型进行了仿真和实验，以验证所提出方法的有效性。这表明理论和实验边界条件非常吻合。

结论

本文提供了平衡点和边界条件，并对 3-Z 网络转换器的行为有更深入的了解。对变流器的大信号平均模型进行了四种运行模式和每种模式的边界条件的推导，为工程师调整系统参数以实现所需的运行模式提供了指导。仿真和实验验证了所提出的识别操作边界的准确性和有效性。