高可靠性“三双”接线配电网分布式电源最大接入容量研究

Research of Maximum Access Capacity of Distributed Generation in the “Three-double Connection” High Reliability Distribution Network

分布式电源接入配电网后,整个配电系统的潮流、电压水平和网络损耗将发生变化。分析了DG接入位置、容量大小对"三双"接线电压水平的影响,并将短路容量比作为DG容量变化对接入点电压波动影响的评估指标。综合考虑DG接入点电压波动、电压偏移、线路热稳定和变压器容量极限等因素,确定了高可靠性配电网"三双"接线中DG的最大接入容量。

When distributed generation （DG） is integrated into the distribution network, the power flow, voltage level and network losses of the whole distribution system will be changed. Based on the ＂three-double connection＂ high reliability distribution network typical application scenarios of Zhejiang Power Grid, the adaptability of ＂three- double connection＂ distribution network integrated with DG was studied. The impact of location and capacity of DG on the voltage level of ＂three-double connection＂ distribution network was analyzed, and the voltage fluctuation of DG connection point was evaluated using the short circuit capacity ratio. Finally, the maximum access capacity of DG in the ＂ three-double connection＂ distribution network was determined considering the limits of voltage fluctuation, voltage deviation, line thermal stability and transformer capacity.