考虑分布式电源系统特性的配电网短路电流计算模型研究

Study on Short-Circuit Current Calculation Model for Distribution Networks Considering Distributed Power System Characteristics

配电网近年来面临着多样性负荷的不断增长和分布式电源的快速发展,这对配电网的短路电流产生了显著的影响。特别是在分布式电源方面,其逐渐替代了清洁能源与传统石化能源。逐年增长的分布式电源接入将对配电网的安全稳定运行产生重要影响,即配电网从单一电源网络变为多电源网络,这将改变配电网的正常运行状况和非正常运行状况,影响潮流分布,并需要充分考虑分布式电源注入的短路电流影响。针对光伏系统短路电流分析时的差异需求,提出了适用于大规模分布式电源接入配电网系统工程计算的短路电流计算模型。在保留原有低频瞬态特性的基础上,对主电路和控制算法进行了简化,提出了分布式电源系统短路瞬态等效模型。

In recent years,distribution networks have faced a continuous increase in diverse loads and rapid development of distributed sources,significantly impacting short-circuit currents.Particularly in the realm of distributed power sources,there is a gradual transition towards replacing traditional fossil fuels with clean energy sources.The growth of distributed power source integration has a substantial impact on safe and stable operation of distribution networks.Distribution network is evolving from a single-source network to a multi-source network,resulting in changes of normal and abnormal operating conditions which affect power flow distribution and necessitate careful consideration of the impact brought by distributed source injection.To address the varying requirements for photovoltaic system short-circuit current analysis,this study proposes a short-circuit current calculation model suitable for large-scale integration of distributed power sources into distribution network systems.While preserving the original low-frequency transient characteristics,main circuit and control algorithms have been simplified,and a transient equivalent model for distributed generation systems during short-circuit events has been proposed.