Secondary Low-Voltage Circuit Models—How Good is Good Enough?
Secondary Low-Voltage Circuit Models—How Good is Good Enough?
复制标题
二次低压电路模型——多好才算足够好？
DOI：
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发表时间：
2018
影响因子：
4.4
通讯作者：
R. Dugan
中科院分区：
文献类型：
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作者：
J. Peppanen;C. Rocha;J. Taylor;R. Dugan
传统上，公用配电系统分析仅考虑一次或中压系统。分布式能源越来越多地位于配电变压器的二次侧或低压侧，因此需要将低压系统纳入分析中。然而，大多数配电系统模型不包括二次电路，或者它们的建模细节有限。在缺乏适当的模型数据的情况下，二次电路模型通常依赖于单相模型、恒定功率因数等简化。本文强调了其中一些假设的含义，并就如何需要更准确的二次模型提供了指导。本文表明，在完全平衡的条件下，可以使用单相等效电路对分相次级电路进行精确建模。它还表明，假设功率因数恒定或使用具有实际 15 分钟或更大时间粒度的智能电表测量，可能会导致模拟次级电路损耗或电压出现相当大的误差。
Utility power distribution system analysis has traditionally been performed considering only the primary or medium-voltage system. Distributed energy resources are increasingly being located on the secondary, or low voltage, side of the distribution transformer, requiring the low-voltage system to be included in the analysis. However, most distribution system models do not include secondary circuits or they are modeled with limited detail. In the absence of the appropriate model data, secondary circuits models commonly rely on simplifications such as single-phase models, constant power factor, etc. This paper highlights the implications of some of these assumptions and provides guidance in terms of how more accurate secondary models are needed. This paper shows that split-phase secondary circuits can be modeled accurately with single-phase equivalents under perfectly balanced conditions. It also shows that assuming constant power factor or using smart meter measurements with practical 15 min, or larger, time granularity can lead to considerable errors in simulated secondary circuit losses or voltages.