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首页> 外文会议>2015 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies >Power loss analysis for low-voltage distribution networks with single-phase connected photovoltaic generation
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Power loss analysis for low-voltage distribution networks with single-phase connected photovoltaic generation

机译：单相光伏发电的低压配电网的功率损耗分析

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摘要

Currently, the photovoltaic generation has been paid highly attention to and has obtained policy encouragement. With the increasing popularity of single-phase photovoltaic in low-voltage distribution networks, it may deteriorate the overall grid performance including power flows, losses and voltage pro files. On the other side, single-phase photovoltaic connected to the distribution networks will have some influence on the balance of three-phase that may bring additional losses under a three-phase unbalanced situation. In this paper, the concept of three-phase load current unbalance factor is introduced and additional losses in circuits and transformers induced by the three-phase unbalance are firstly analyzed. Secondly, the variation characteristics of the power loss and the three-phase unbalance are studied when single-phase photovoltaic is connected to different phases and different capacities. Furthermore, the paper also investigates the influence on the power loss considering different positions the photovoltaic connected along the low-voltage feeder. From the perspective of decreasing the three-phase unbalance factor, some advice for the photovoltaic connected to the distribution networks is proposed at last. The simulation results show that the proposed advice can effectively reduce the losses caused by the three-phase unbalance. It also provides effective guidance and recommendations for the electricity company to carry out loss reduction work and to deal with large-scale single-phase photovoltaic connection in the future.
机译：当前，光伏发电已受到高度重视并获得了政策鼓励。随着单相光伏发电在低压配电网络中的日益普及，它可能会降低整个电网性能，包括潮流，损耗和电压分布。另一方面，连接到配电网的单相光伏发电将对三相平衡产生某些影响，这可能会在三相不平衡情况下带来额外的损失。本文介绍了三相负载电流不平衡因数的概念，并首先分析了三相不平衡引起的电路和变压器的附加损耗。其次，研究了单相光伏连接不同相，不同容量时的功率损耗和三相不平衡的变化特征。此外，本文还研究了光伏沿低压馈线连接的不同位置对功率损耗的影响。从减小三相不平衡因子的角度出发，最后提出了与配网连接的光伏发电的一些建议。仿真结果表明，所提建议可以有效减少三相不平衡引起的损耗。它还为电力公司开展减少损失的工作以及将来应对大规模的单相光伏连接提供了有效的指导和建议。

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