高渗透率光伏发电系统中网源互动技术的研究

发布时间：2018-02-17 00:51

本文关键词： 高渗透率分布式光伏发电系统链式配网电压控制型逆变器　出处：《上海电力学院》2015年硕士论文　论文类型：学位论文

【摘要】：随着传统化石能源的消耗与人们对环境问题的普遍关注,太阳能等清洁能源利用受到各国重视,分布式光伏发电得以迅速发展。然而由于光伏发电具有间歇性与波动性,大规模高渗透率分布式并网功率接入配电网将会影响配电网系统的稳定运行。本文首先通过搭建基于传统电流控制型逆变器的分布式光伏发电系统,探究高渗透率分布式光伏发电对链式配电网的影响。在分布式发电系统以单位功率因数接入链式配电网条件下,探讨了在不同接入点、不同线路阻抗比、不同负荷时分布式光伏发电对配电网电压的影响。其次,针对带轴压调节电压控制型逆变器控制策略,本文提出了三种基本的分布式发电系统并网控制模式:同步发电机模式、最大功率控制模式与电压控制模式。经验证,三种控制模式均能够提高分布式发电系统的并网控制能力。然后,通过对实验中出现的并网电流畸变现象进行分析,探究与评估了高渗透率分布式并网功率对配电网电流质量的影响。本文搭建了电压控制型逆变器并网系统。控制不同的并网功率因数,分析与评估分布式并网功率对配电网线路电压与功率损耗的影响。在此基础上,对比探讨了四种典型功率调压方法的优劣。最后,基于分布式并网功率对配电网影响的评估结果,本文提出了两种带无功调节的分布式发电系统并网控制模式:最大功率电压补偿模式和无功补偿模式。经验证,两种带无功调节的并网控制模式,对高渗透率配电网均具有一定的优化作用。通过探究在高渗透率条件下分布式发电系统与配电网间的相互作用机理,本文研究了分布式光伏发电系统的五种并网控制模式。五种并网模式均基于带轴压调节电压控制型逆变器控制策略提出,增强了配电网对新能源的接纳能力,且能够提高分布式光伏发电系统的网源互动能力。本文的研究成果对分布式发电系统具有理论参考和实践应用意义。
[Abstract]:With the consumption of traditional fossil energy and the widespread attention to environmental problems, the utilization of clean energy such as solar energy has been paid attention to by many countries, and distributed photovoltaic power has been developed rapidly. However, photovoltaic power generation is intermittent and volatile. Large scale and high permeability distributed grid-connected power access will affect the stable operation of distribution network system. Firstly, a distributed photovoltaic power generation system based on traditional current-controlled inverter is built in this paper. The influence of distributed photovoltaic generation with high permeability on chain distribution network is investigated. Under the condition that the distributed generation system is connected to the chain distribution network with unit power factor, the different line impedance ratio and different access point are discussed. The influence of distributed photovoltaic power generation on distribution network voltage under different loads. Secondly, aiming at the control strategy of voltage control inverter with axial voltage regulation, three basic grid-connected control modes of distributed generation system: synchronous generator mode are proposed in this paper. The maximum power control mode and voltage control mode. It is proved that the three control modes can improve the grid-connected control ability of distributed generation system. Then, the distortion phenomenon of grid-connected current in the experiment is analyzed. The influence of distributed grid-connected power with high permeability on the current quality of distribution network is investigated and evaluated. In this paper, a voltage-controlled inverter grid-connected system is built to control different grid-connected power factors. The influence of distributed grid-connected power on the voltage and power loss of distribution network is analyzed and evaluated. On this basis, the advantages and disadvantages of four typical power regulation methods are compared and discussed. Based on the evaluation results of the influence of distributed grid-connected power on distribution network, this paper presents two grid-connected control modes of distributed generation system with reactive power regulation: maximum power voltage compensation mode and reactive power compensation mode. Two kinds of grid-connected control modes with reactive power regulation can optimize the distribution network with high permeability. By exploring the interaction mechanism between distributed generation system and distribution network under the condition of high permeability, two kinds of grid-connected control modes with reactive power regulation are discussed. In this paper, five grid-connected control modes of distributed photovoltaic power generation system are studied. The five grid-connected modes are all based on the control strategy of voltage control inverter with axial voltage regulation, which enhances the ability of the distribution network to accept new energy. The research results of this paper have theoretical reference and practical significance for distributed photovoltaic power generation system.
【学位授予单位】：上海电力学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM615

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