Efficient integration of buck converter into an active rectifier for DC-fault current limitation in DC networks

Evangelos E. Pompodakis , Georgios I. Orfanoudakis
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引用次数: 0

Abstract

Voltage Source Converters (VSCs) operating as active rectifiers inherently lack current-limiting capabilities for faults occurring on the DC side due to the presence of freewheeling diodes in IGBT or MOSFET structures. This limitation leads to uncontrolled fault currents, flowing from the AC to the DC network, that can jeopardize the safety of power electronic components. Additionally, the challenge is compounded in DC networks, where DC circuit breakers must interrupt high fault currents, fed by the AC side, without the benefit of current zero crossings. To address these issues, this paper presents a novel topology that integrates a classical buck DC/DC converter into a VSC to regulate the currents of faults occurring in DC network, thereby improving the protection of the converter and aiding DC circuit breakers in interrupting the fault. The advantage of the proposed topology lies in that under normal operating conditions, the buck converter is totally bypassed, thus improving the efficiency of the topology. When a fault is detected within the DC microgrid, the buck converter is connected in series with the VSC to control the current flowing from the AC to DC network. Simulation results using MATLAB/Simulink validate the effectiveness of the proposed topology in completely controlling the current at the DC side of converter, thus demonstrating significant improvements in fault management, system reliability, and converter protection.
有效集成降压变换器为有源整流器,用于直流网络中直流故障限流
电压源变换器(VSCs)作为有源整流器工作,由于IGBT或MOSFET结构中存在随心所欲的二极管,因此在直流侧发生故障时固有地缺乏限流能力。这种限制导致故障电流不受控制,从交流流向直流网络,可能危及电力电子元件的安全。此外,在直流网络中,挑战更加复杂,直流断路器必须中断交流侧馈电的高故障电流,而没有电流过零的好处。为了解决这些问题,本文提出了一种新颖的拓扑结构,将传统的降压DC/DC变换器集成到VSC中,以调节直流网络中发生故障时的电流,从而提高变换器的保护能力,并帮助直流断路器中断故障。该拓扑的优点在于,在正常工作条件下,降压变换器完全旁路,从而提高了拓扑的效率。当直流微电网检测到故障时,降压变换器与VSC串联,以控制从交流到直流网络的电流。利用MATLAB/Simulink进行的仿真结果验证了所提出的拓扑结构在完全控制变换器直流侧电流方面的有效性,从而在故障管理、系统可靠性和变换器保护方面得到了显著改善。
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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CiteScore
2.10
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