计及短路电流约束的分布式电源准入容量的计算

在尽量不调整配电保护装置的情况下,针对分布式电源的准入容量问题,提出计及短路电流约束的准入容量计算原理和模型,对配电网中计及DG影响的故障计算原理进行分析.该模型的主要特点是把短路约束条件表达为分布电源准入容量与其次暂态电抗之间的函数关系.通过对单分布式电源和多分布式电源的计算和分析,验证了此方法的可行性.

Maximum penetration capacity calculation for distributed generation taking into account fault current constraints

With the distributed generation connected into the network,the power flow and short-circuit current in the utility distribution network will be changed.An optimization method is proposed for computing the maximum penetration level of DG,taking into account fault current constraints while existing distribution network protection should not be adjusted as much as possible.The fault calculation principle in the distribution network with DG is analyzed.A mathematical methodology to convert constraints imposed by fault levels to simple nonlinear inequality constraints is developed.The feasibility of the proposed method is showed by examples of a single DG system and a multiple DG system.