【摘要】 含逆变型分布式电源(inverter interface distribution generator, IIDG)的配电网故障时,IIDG由于受到控制策略及出力随机性的影响,其短路电流具有很强的非线性,这给配电网的保护整定带来了困难。针对该问题分析了含IIDG配电网不同故障情况下短路电流与IIDG输出功率的关系,并指出其对现有传统保护的影响,提出了根据故障类型采用不同定值的自适应电流保护方案。以MATLAB/Simulink中建立的一个含IIDG的10 kV配电系统为例,验证了该保护方案在不同故障情况下具有良好的选择性与灵敏性。更多还原

【Abstract】 When the distribution network with inverter interface distribution generator(IIDG) fails, the short-circuit current of IIDG is affected by the control strategy and the randomness of the output. The protection setting has brought difficulties. Aiming at this problem, the relationship between the short-circuit current and the output power of the IIDG under different fault conditions in the IIDG distribution network was analyzed, and its influence on the existing traditional protection was pointed out. An adaptive current protection scheme with different fixed values according to the fault type was proposed. Taking a 10 kV power distribution network with IIDG established in MATLAB/Simulink as an example, it is verified that the protection scheme has good selectivity and sensitivity under different fault conditions.更多还原