Low-frequency Stability Analysis of the DC-link in Dual Active Bridge (DAB) Based Microgrid

2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) Pub Date : 2019-12-01 DOI:10.1109/APPEEC45492.2019.8994403

Danping Zheng, Liang Chen, H. Nian, Dan Sun, Liang Chen

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引用次数: 3

Abstract

A micro-grid system based on a source dual active bridge (DAB) converter connected with load buck-boost DC/DC converter and DC/AC converter by the common DC-link is studied in this paper, which is widely investigated in the yield of intelligent distribution microgrid. As the power transmission hub, the stability of the DC-link voltage plays a key role in the normal operation of the whole system, which affects the stable operation of the back-stage inverters as well as the normal power supply of connected loads. The stability problem in DC-link may occur at the low frequency, if the impedance characteristic of DAB as a source is incompatible with the impedance characteristic of back-stage converters, which will be investigated in this paper. Seen from common DC-link, the impedance of DAB, DC/DC and DC/AC converters on this side are modeled. Based on the model, the mechanism and main contributor of low-frequency oscillation in DC-link are presented. The derived impedance model in the frequency domain and the result of stability analysis are verified by the simulation.

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基于双有源电桥(DAB)的微电网直流链路低频稳定性分析

本文研究了一种基于源双有源桥(DAB)变换器的微电网系统，该系统与负载降压DC/DC变换器和DC/AC变换器通过公共DC链路连接，是智能配电微电网产量研究的热点。直流链路作为输电枢纽，其电压的稳定对整个系统的正常运行起着至关重要的作用，它不仅影响到后台逆变器的稳定运行，也影响到所连接负载的正常供电。如果作为源的DAB的阻抗特性与后台变换器的阻抗特性不兼容，在低频时可能会出现直流链路的稳定性问题，本文将对此进行研究。从常见的DC-link出发，对这一侧的DAB、DC/DC和DC/AC变换器的阻抗进行建模。在此基础上，分析了直流链路低频振荡的机理和主要影响因素。仿真结果验证了所建立的频域阻抗模型和稳定性分析结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

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