| 引用本文: | 李 征,王文宾,韩胜峰,林丽娟.考虑无功支撑的分布式光伏接入配电网电压适应性研究[J].电力系统保护与控制,2022,50(11):32-41.[点击复制] |
| LI Zheng,WANG Wenbin,HAN Shengfeng,LIN Lijuan.Voltage adaptability of distributed photovoltaic access to a distribution networkconsidering reactive power support[J].Power System Protection and Control,2022,50(11):32-41[点击复制] |
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| 摘要: |
| 在构建以新能源为主体的新型电力系统背景下，分布式光伏呈现高比例渗透趋势。光伏出力的波动性易引起配电网电压越限和三相不平衡问题，同时光伏逆变器的剩余容量又具有无功主动支撑作用，有利于改善电压质量。而且配电网阻感比大、电压与有功耦合明显，导致配电网电压受光伏有功无功的综合影响而更加复杂。从电压适应性角度研究配电网接纳三相和单相分布式光伏的承载能力。首先，按统计学原理分别建立最大值、期望值和众数值等反映电压质量的统计特征指标，并从光伏渗透率和接入分散程度两方面描述分布式光伏的接入特征。其次，基于历史天气数据构建典型日场景，考虑光伏主动参与无功支撑作用，运用随机模拟分析得出各节点电压质量统计指标。最后，采用AHP-CRITIC组合赋权法分别对电压偏差和不平衡指标进行一定的加权组合，综合反映电压适应性。应用OpenDSS软件进行算例分析，结果验证了所提方法的有效性。 |
| 关键词: 配电网 分布式光伏 主动支撑 场景构建 电压适应性 |
| DOI：DOI: 10.19783/j.cnki.pspc.211781 |
| 投稿时间：2021-12-30修订日期：2022-02-16 |
| 基金项目:国家自然科学基金项目资助(51807172)；国网河北省电力有限公司科技项目资助(kj2021-041) |
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| Voltage adaptability of distributed photovoltaic access to a distribution networkconsidering reactive power support |
| LI Zheng,WANG Wenbin,HAN Shengfeng,LIN Lijuan |
| (1. Xingtai Power Supply Branch, State Grid Hebei Electric Power Co., Ltd., Xingtai 054001, China; 2. Key Lab of Power
Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University, Qinhuangdao 066004, China) |
| Abstract: |
| New power systems will be built with ‘new’ energy as the main component. Distributed photovoltaics are the main trend in high proportion penetration. The fluctuation of photovoltaic output is prone to cause voltage out of limit and three-phase imbalance of a distribution network. The residual capacity of a photovoltaic inverter has the function of voltage active support, which is conducive to improving voltage quality. At the same time, the large resistance inductance ratio of a distribution network makes the coupling between voltage and active power obvious, resulting in the comprehensive influence of photovoltaic active and reactive power on the voltage of the network. This paper studies the carrying capacity of the network in accepting three-phase and single-phase distributed photovoltaics from the perspective of voltage adaptability. First, according to statistical principles, the indices reflecting the voltage quality statistical characteristics of maximum value, expected value and public value are established. The access characteristics of distributed photovoltaic are described from the two aspects of photovoltaic permeability and the dispersion of access location. Secondly, a typical daily scenario is constructed based on historical weather data, considering the active participation of photovoltaic in voltage support, and the statistical indicators of voltage quality of each node are obtained by random simulation analysis. Finally, the AHP-CRITIC combination weighting method is used to combine the statistical indices of voltage deviation and imbalance, and the comprehensive indices representing voltage adaptability are obtained. An example is analyzed using OpenDSS software, and the results verify the effectiveness of the method.
This work is supported by the National Natural Science Foundation of China (No. 51807172). |
| Key words: distribution network distributed photovoltaic active support scenario construction voltage adaptability |
