Asynchronous Startup of the Paralleled DC-DC Converters in DC Microgrid Based on the Injected Frequency

2021 5th International Conference on Green Energy and Applications (ICGEA) Pub Date : 2021-03-06 DOI:10.1109/ICGEA51694.2021.9487597

Xuzhou Zhuang, Qinjin Zhang, Yancheng Liu, Pengli Zhu, Yuji Zeng

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引用次数: 1

Abstract

The droop control of DC-DC converters based on injected AC voltage small-signal realizes current sharing control without communication, but DC-DC converter startup fails when AC voltage amplitude, frequency and phase do not meet sufficient conditions. In order to improve the success rate of the DC-DC converter connected to the DC bus, an asynchronous startup strategy based on phase difference is proposed. The AC and DC voltage conditions of the DC-DC converter connected to the microgrid under the injected frequency droop control are analyzed, and the control function of the circuit breaker is designed by using the voltage signals on both sides of the circuit breaker. The small-signal model is used to analyze the frequency convergence characteristics of AC voltage under the asynchronous startup strategy. The hardware in the loop experiment based on Starsim shows that the asynchronous startup method based on phase difference can realize the smooth connection between the DC-DC converter and DC bus, and improve the dynamic performance of the connection process.

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基于注入频率的直流微电网并联DC-DC变流器异步启动

基于注入交流电压小信号的DC-DC变换器的下垂控制实现了无需通信的电流共享控制，但当交流电压幅值、频率和相位不满足充分条件时，DC-DC变换器启动失败。为了提高直流变换器接在直流母线上的成功率，提出了一种基于相位差的异步启动策略。分析了注入频率下垂控制下与微电网连接的DC-DC变换器的交直流电压情况，利用断路器两侧的电压信号设计了断路器的控制功能。采用小信号模型分析了异步启动策略下交流电压的频率收敛特性。基于Starsim的硬件在环实验表明，基于相位差的异步启动方法可以实现DC-DC变换器与直流母线的平滑连接，提高连接过程的动态性能。

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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2021 5th International Conference on Green Energy and Applications (ICGEA)

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