基于无功功率和储能平衡的配网馈线电压控制

发布时间：2018-01-19 11:36

本文关键词： 光伏发电系统电压平衡无功控制储能　出处：《中南大学学报(自然科学版)》2017年11期 　论文类型：期刊论文

【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。
[Abstract]:In order to solve the problem of voltage instability caused by low voltage distribution feeder in rooftop photovoltaic power generation system, the characteristics of distribution line capacity and inverter capacity are considered on the premise of voltage fluctuation mechanism of low voltage feeders. This paper presents a control method which combines reactive power, active power and energy storage to prevent voltage instability from occurring in low-voltage feeders. Firstly, the residual capacity of photovoltaic inverter is used to absorb reactive power. To some extent, the voltage distribution of the feeder is improved, and then the power output of each photovoltaic system is obtained by using active power control. The results show that: in the case of overvoltage. The excess power can be absorbed through the storage energy of the photovoltaic system itself, and the energy storage energy can be released when the high load demand or the nocturnal voltage drops, so as to improve the power grid's ability to absorb the new energy and the output power of the new energy. The new coordinated power optimization scheme of reactive power, active power and energy storage not only has the ability to balance the feeder voltage, but also has higher photovoltaic utilization efficiency, which is suitable for the future large-scale photovoltaic access distribution network environment.
【作者单位】：长沙理工大学电气与信息工程学院;青海省光伏发电并网技术重点实验室;国家输变电电器产品质量监督检测中心(筹);
【基金】：国家自然科学基金资助项目(51307009) 湖南省教育厅创新平台开放基金资助项目(16K004) 衡阳市科技计划重点项目(2015KG27) 可再生能源电力技术湖南省重点实验室基金资助项目(2016ZNDL006)~~
【分类号】：TM714.2
【正文快照】： (1.School of ElectricalInformation 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 a

【相似文献】