基于两端口网络模型的交直流混合子系统相互作用问题研究

项目名称： 基于两端口网络模型的交直流混合子系统相互作用问题研究

项目编号： No.51207023

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电气科学与工程学科

项目作者： 王建华

作者单位： 东南大学

项目金额： 25万元

中文摘要： 新兴的分布式供电系统中广泛应用电力电子变流技术，源与负载高度耦合，动态响应较为复杂，现有小信号建模及输入/输出阻抗分析方法已足以支持直流子系统之间稳定性分析，但交直流子系统之间以及双向功率流动场合的相互作用问题研究有待进一步深入。申请者前期研究中发现，覆盖输入输出阻抗、电流反向增益等模型在内的两端口网络模型是直流及单相交流子系统相互作用问题研究的关键。本课题拟研究直直变换器的电流反向增益模型、单相交流电源输入输出阻抗模型以及隔离型双向直直变换器PWM Switch平均模型，阐明交直流子系统及双向变换场合稳定性、谐波等系统内部相互作用机理。该问题的研究为电力电子交直流系统系统级分析提供理论依据，对分布式电源可靠平稳协同运行具有重要的理论意义与实际价值。

中文关键词： 相互作用；两端口网络；统一模型；低频纹波；漏电流

英文摘要： Power electronics converting techniques are widely employed in emerging distributed power system, where sources and loads are strong coupling and dynamic responses between them are complex. The existing small signal modeling techniques and input/output impedance methodology is sufficient to support stability analysis of dc subsystems. However, interaction issues between dc & ac subsystems and in bidirectional power flow field still need further investigation. Through prior research work done by the applicant, two-port network model including input/output impedance and current back gain is the key factor in interaction issue study. This project focuses on current back gain model of dc/dc converters, input/output impedance of a single phase ac power supply and averaged PWM switched model of an isolated bidirectional dc/dc converter. It would clarify the interaction mechanism of stability, harmonic analysis in ac & dc hybrid systems and those with bidirectional power flow application. The research would also provide theoretical basis for systematical analysis of ac & dc power electronics hybrid systems. This method is of important theoretical significance and practical value to develop reliable, stable, distributed power system.

英文关键词： Interaction；Two-Port Network；Unified model；low frequency ripple；leakage current