一种机电—电磁暂态混合仿真外部系统各序等值及实现方法

A three-sequence external system equivalent and its realization for electrometrical and electromagnetic hybrid simulation

为了准确模拟外部系统各序等值阻抗,提出了一种适用于机电—电磁暂态混合仿真的多端口外部等值电路模型并给出其实现方法。该方法基于电流补偿的原理,通过计算外部系统等值的瞬时注入电流,解决了正负序等值阻抗不相等引起的不对称节点导纳矩阵的求解问题。仿真结果表明,与单纯电压源等值方式相比,该方法可以体现外部系统各序等值阻抗,并且可以方便地扩展到多个端口,适合进行电磁侧发生非对称故障之后的仿真分析。

To simulate the three sequence impedance accurately, a multi-port extemal system equivalent circuit model is proposed as well as the realization method which is proper for electrometrical and electromagnetic hybrid simulation. The method is based on the current compensation principle. Through calculating the current injected by the external system, the method settles the problem of solving the nonsymmetrical admittance matrix. The simulation results show that the method can reflect the three-sequence equivalent impedance and could be easily expended to multi-port. The method is proper for the simulation analysis after an unbalanced fault occurs in electromagnetic side.