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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第11期    总第279期    2017年11月

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文章编号:1672-7207(2017)11-2972-07
基于无功功率和储能平衡的配网馈线电压控制
易浩民1,夏向阳1,李经野1,王尚宁2,李明德3,刘代飞1,王恺3,黄海3,汤赐1,李正曦2

(1. 长沙理工大学 电气与信息工程学院,湖南 长沙,410114; 2. 青海省光伏发电并网技术重点实验室,青海 西宁,810008; 3. 国家输变电电器产品质量监督检测中心(筹),湖南 衡阳,430400)

摘 要: 针对屋顶光伏发电系统接入低压配电馈线引起的配网电压不稳定问题,在满足低压馈线的电压波动机理的前提下,考虑配网线路容量和逆变器容量不变的特性,提出一种无功、有功、储能三者相结合的控制方法,以防止低压馈线电压失稳的现象发生。该策略首先利用光伏逆变器自身的剩余容量吸收无功功率,在一定程度上改善配网馈线的电压分布,然后运用有功控制得出每个光伏系统的功率输出。研究结果表明:在过电压情况下,可将多余功率通过光伏发电系统自身的蓄电池储能吸收,于高负载需求或夜间电压跌落时将储能释放,提高电网对新能源的消纳能力和新能源的输出功率;新型无功、有功、储能三者协同的功率优化方案不仅具有使馈线电压平衡的能力,而且具有更高的光伏利用效率,适用于未来大规模光伏接入配网的环境。

 

关键词: 光伏发电系统;电压平衡;无功控制;储能

Feeder voltage control in distribution network based on reactive power and energy storage balance
YI Haomin1, XIA Xiangyang1, LI Jingye1, WANG Shangning2, LI Minde3, LIU Daifei1, WANG Kai3, HUANG Hai3, TANG Ci1, LI Zhengxi2

1. School of Electrical & Information Engineering, Changsha University of Science and Technology, Changsha 410114, China; 2. Qinghai Key Lab of PVGC Technology, Xining 810008, China; 3. National Products Quality Supervision Inspection Center on Power Transmission and Transformation Equipment, Hengyang 430400, China

Abstract:Considering that roof photovoltaic power generation system can lead to voltage instability in distribution network, on the premise of voltage instability mechanism of low voltage feeder, invariant distribution line capacity and the inverter capacity characteristics were considered, and then a reactive power, active power and energy storage combined control method was proposed to prevent the occurrence of excessive voltage ripple’s phenomenon in low voltage feeder. Firstly, the strategy utilized the residual capacity of the photovoltaic inverter itself to absorp the reactive power, which helped to improve feeder voltage distribution to a certain extent. Then the power output of each PV system was obtained by active power control. Under the condition of voltage limitation and the excess power could be absorbed by the battery energy storage of the photovoltaic power generation system, and the stored energy was released in high load demand or voltage drop at night. The results show that this method can improve the power grid of new energy consumptive ability and enhance the new energy output power. The new power optimization scheme that reactive power, active power and energy storage cooperate not only has the ability of maintaining the low voltage feeder voltage within a limit, but also has higher PV efficiency and is suitable for future network environment of large-scale PV access distribution.

 

Key words: PV system; voltage balance; reactive power control; energy storage

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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