Fault analysis for simultaneous AC-DC power transmission in distribution system integrated with distributed PV generation

IF 6 2区 工程技术 Q2 ENERGY & FUELS
Jiahao Zhang , Zitao Liao , Youzhuo Zheng , Xiao Zhong , Hua Bao , Song Bao , Fozildjon Abidovich Hoshimov , Qiuqin Sun
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引用次数: 0

Abstract

The use of simultaneous AC-DC power transmission can not only increase line capacity, but also alleviate the shortage of power supply in existing distribution system. Moreover, renewable energy is used efficiently by cancelling the energy conversion equipment. Simultaneous AC-DC power transmission in distribution system integrated with distributed photovoltaic generation has a great prospect of application. However, due to the special structure of simultaneous AC-DC power systems, their fault characteristics are very complex, which may render traditional protection strategies ineffective, and existing research on fault analysis for such systems is limited. Unlike existing studies that mainly focus on fault analysis of individual AC and DC systems or VSC-based hybrid AC/DC systems, a comprehensive fault analysis for simultaneous AC-DC power system is presented in this paper, which is essential to relay protection design. Firstly, the structure of system is introduced. Secondly, two types of common faults, i.e., single line-to-ground (SLG) and three-phase-ground (TPG) faults, are analyzed. The fault process is divided into several stages, each stage describing the fault circuit and main equations. The simulation model is built to prove the correctness of the analysis. Then, the factors affecting fault characteristics, including grounding resistance, DC-link capacitance, and initial phase angle of the fault are discussed. Finally, the fault characteristic is studied with various DC injection modes. Furthermore, a method for suppressing overvoltage in DC system under SLG fault is proposed.
分布式光伏发电集成配电系统交直流同步输电故障分析
采用交直流同步输电不仅可以增加线路容量,而且可以缓解现有配电系统供电不足的问题。此外,通过取消能量转换设备,可再生能源得到有效利用。结合分布式光伏发电的配电系统交直流同步输电具有广阔的应用前景。然而,由于交直流同步电力系统的特殊结构,其故障特征非常复杂,传统的保护策略可能会失效,现有的交直流同步电力系统故障分析研究有限。不同于现有的研究主要集中在单独的交直流系统或基于vsc的交直流混合系统的故障分析,本文提出了一种全面的交直流同步电力系统故障分析,这对继电保护设计至关重要。首先介绍了系统的结构。其次,分析了两类常见故障,即单线对地故障(SLG)和三相接地故障(TPG)。将故障过程分为几个阶段,每个阶段描述故障电路和主要方程。通过建立仿真模型,验证了分析的正确性。然后讨论了影响故障特性的因素,包括接地电阻、直流电容和故障初始相角。最后,研究了不同直流注入方式下的故障特性。在此基础上,提出了一种抑制SLG故障下直流系统过电压的方法。
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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来源期刊
Solar Energy
Solar Energy 工程技术-能源与燃料
CiteScore
13.90
自引率
9.00%
发文量
0
审稿时长
47 days
期刊介绍: Solar Energy welcomes manuscripts presenting information not previously published in journals on any aspect of solar energy research, development, application, measurement or policy. The term "solar energy" in this context includes the indirect uses such as wind energy and biomass
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