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在机电电磁暂态混合仿真中，一侧系统计算需要对对侧系统进行等值建模。本文基于 RTDS/CBuilder 提出了一种计及机电侧系统三序等值阻抗的适用于机电电磁暂态混合仿真的接口建模方法，详细介绍了接口模型的建模原理、实现方法和计算流程。仿真结果表明，该方法可以保证电磁侧发生非对称故障后的仿真精度，具有良好的扩展性。“,”In hybrid electrometrical and electromagnetic transient simulation,the equivalent modeling of the other side system should be concerned when the calculation is car-ried in one side.To simulate the electromechanical side sys-tem accurately,an interface modeling method for hybrid e-lectromechanical and electromagnetic transient simulation is proposed based on RTDS/CBuilder.The modeling principle of interface model is introduced in detail as well as realiza-tion method and calculation scheme.The simulation results show that this method can ensure the simulation accuracy when an imbalanced fault occurs in the electromagnetic side, which has good scalability.