考虑电流保护可靠性的分布式电源准入容量研究

摘要

为了研究配电网对分布式电源的最大准入容量，利用DIgSILETT建立同步发电机型的分布式电源，分析配电网各个母线对分布式电源的准入容量以及限制因素。仿真分析结果表明，在不改变现有三段式电流保护的前提下，从分布式电源接入对配电网电流保护可靠性影响角度进行分析，不同母线对分布式电源准入容量的限制差异较大，最后提出可以通过重新整定保护装置的动作值和采用电压电流连锁速断保护来提高分布式电源的准入容量。%In order to study the max penetration capacity of Distributed Generation (DG),a dynamic model of DG is built using DIgSILETT to analyze the DG’s penetration capacity of each bus and constraints. The simulation results show that in the premise of not changing the existing three-section current protection, viewed from the angle of the effects of the DG access to the distribution grid on the reliability of the current protection,the bus is found to have significant effects on the limit of capacity for the DG access. Finally,the paper proposes two ways to increase the penetration capacity of DG: retuning protection devices and the use of the voltage and current fast break protection.