分布式光伏并网对配电变压器运行特性的影响研究
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摘要
分布式光伏接入配电网后,其电源特性改变了传统配电网的负荷特性,使潮流具有双向流动的特性。制定有源配电网配电变压器的建设与配置方案,必须开展分布式光伏并网对配电变压器运行特性的影响评估工作。从机理上分析了分布式光伏接入对配电变压器的影响,为量化其对配电变压器的影响,提出一套基于概率的评估指标。基于该评估指标,研究在不同光伏渗透率下,配变低压侧电压、负载率与损耗的变化情况。分析分布式光伏并网对配电变压器运行特性的影响。
After the distributed photovoltaic is connected to the distribution network, its power supply characteristics change the load characteristics of the traditional distribution network and make the power flow have the characteristics of bidirectional flow.In order to develop the construction and configuration scheme of distribution transformer in active distribution network, the influence evaluation of distributed photovoltaic grid-connection on the operation characteristics of distribution transformer must be carried out.Firstly, the effect of distributed photovoltaic access on distribution transformer is analyzed from the mechanism. In order to quantify its influence on distribution transformer, a set of probability-based assessment indexes is proposed. On this basis, based on the probability assessment index,this paper studies the changes of low-voltage side voltage, load rate and loss of distribution transformer under different distributed photovoltaic permeability. Base on this, the influence of distributed photovoltaic grid-connected on the operation characteristics of distribution transformer is analyzed.
After the distributed photovoltaic is connected to the distribution network, its power supply characteristics change the load characteristics of the traditional distribution network and make the power flow have the characteristics of bidirectional flow.In order to develop the construction and configuration scheme of distribution transformer in active distribution network, the influence evaluation of distributed photovoltaic grid-connection on the operation characteristics of distribution transformer must be carried out.Firstly, the effect of distributed photovoltaic access on distribution transformer is analyzed from the mechanism. In order to quantify its influence on distribution transformer, a set of probability-based assessment indexes is proposed. On this basis, based on the probability assessment index,this paper studies the changes of low-voltage side voltage, load rate and loss of distribution transformer under different distributed photovoltaic permeability. Base on this, the influence of distributed photovoltaic grid-connected on the operation characteristics of distribution transformer is analyzed.
引文
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[8]陈小青.基于蒙特卡洛模拟的电网调度运行风险评估研究[D].长沙:湖南大学,2013.
[2]李桂昌,伍肇龙,羿应棋.高渗透率分布式电源对配电网影响分析[J].大众用电,2018,(08):26-27.
[3]盛康.提升光伏消纳能力的需求侧管理策略研究[D].北京:北京交通大学,2017.
[4]李亮,唐巍,白牧可,等.考虑时序特性的多目标分布式电源选址定容规划[J].电力系统自动化,2013,(03):58-63+128.
[5]陈旭.变压器运行特性分析[J].露天采矿技术,2016,(03):57-59+63.
[6]黄绍平.D,yn11联结组配电变压器运行特性的理论分析[J].变压器,1996,(07):12-15..
[7]闫志强,雷霞,何建平,等.三相不平衡对配电变压器损耗影响的研究[J].电测与仪表,2017(16):43-49.
[8]陈小青.基于蒙特卡洛模拟的电网调度运行风险评估研究[D].长沙:湖南大学,2013.