Fault response of inverter interfaced distributed generators in grid-connected applications
Fault response of inverter interfaced distributed generators in grid-connected applications
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DOI：
10.1016/j.epsr.2013.07.013
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发表时间：
2014
影响因子：
3.9
通讯作者：
C. Plet;T. Green
中科院分区：
文献类型：
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作者：
C. Plet;T. Green
由于光伏和其他新能源的增长，逆变器接口分布式发电在一些配电网中变得突出。为了确保保护系统设计在这种环境下仍然有效，在故障电流计算中能够准确地表示逆变器是至关重要的。计算故障电流的贡献是复杂的，因为转换到限流模式的性质，因为产生的电流是控制选择和物理组件的函数。希望得到一个简单的源加阻抗模型，以便纳入网络研究。基于控制策略的知识和限流方法的细节，提出了线性解析等效模型，其源和阻抗值（基频）可以表示为逆变器硬件参数和控制器增益的函数。考虑到进入限流状态与电网中其他发电机的性质和位置的相关性，提出了一种基于负荷流的故障分析方法。这迭代地确定哪个逆变器经历电流限制。本文提出的逆变器故障模型及其在网络故障分析中的应用，已通过3逆变器网络的实验结果得到验证。
Inverter-interfaced distributed generation is prominent in some distribution networks because of the growth of PV and other new sources. In order to ensure that protection system design remains effective in this environment, it is essential to be able to accurately represent inverters in fault current calculations. Calculating the fault current contribution is complicated because of the nature of the transition into current limiting mode and because the current produced is a function of control choices as well as physical components. The desire is for a simple source plus impedance model for incorporation into network studies. Based on knowledge of the control strategy and the details of the method of current limiting, linear analytical equivalent models are proposed whose source and impedance values (at fundamental frequency) can be expressed as a function of the inverter's hardware parameters and controller gains. The dependence of the entry into current limit on the nature and location of other generators in the network leads to a proposal for a load flow based fault analysis incorporating the new models. This iteratively determines which inverter experiences current limiting. The proposed inverter fault models and their use in a network fault analysis have been verified against experimental results in a 3-inverter network.