Abstract: With the increasing capacity of DG connected to the distribution network，the problems of node voltage cross-limits，system bidirectional power flow，and short-circuit current increase in the traditional distribution network have become increasingly prominent.In order to improve the capacity of renewable energy consumption in the distribution network，the optimal access scheme and the method of maximum using the residual capacity of grid connected inverter to participate in voltage regulation are proposed.By establishing the calculation model of voltage drop of distribution network with multiple access modes of distributed generation，the influence mechanism of single-point and multi-point distributed generation on voltage distribution of distribution network is analyzed.The IEEE33node system model was built based on Matlab，and the influence of access mode，access location，permeability and power factor on the voltage distribution of the distributed generation was studied.In addition，the voltage distribution is presented in a 3dvisual way to more intuitively compare the advantages and disadvantages of different schemes.Studies have shown that DG more evenly distributed grid and making full use of the residual capacity of grid inverter can effectively improve the distribution network voltage distribution and provide references for improving the consumption of renewable energy.

Key words: distributed generation, distribution network, voltage fluctuation, IEEE 33-bus system

摘要： 针对分布式电源(DG)接入配电网容量的不断增大,传统配电网中节点电压越限、系统双向潮流、短路电流升高等问题不断凸显,为提升配电网对可再生能源的消纳能力,提出最优接入方案和最大程度利用并网逆变器剩余容量参与电压调控的方法。通过建立含DG多种接入方式的配电网压降计算模型,分析了单点和多点DG接入对配电网电压分布的影响;基于Matlab搭建了IEEE33节点系统模型,分别对DG的接入方式、接入位置、渗透率、功率因数四个方面对电压分布产生的影响进行了研究,并以三维可视化的方式呈现电压分布,更加直观对比不同方案的优劣。研究表明,DG多点均匀分布接入电网并充分利用并网逆变器剩余容量可有效改善配电网电压分布,为提高可再生能源消纳提供了参考依据。

关键词: 分布式电源, 配电网, 电压波动, IEEE33节点系统