A Universal MISCR Based on Network Topology

With the rapid development of HVDC transmission technology, it is inevitable to form multi-infeed direct current(MIDC) transmission system. Due to the mutual influence between each DC circuit in MIDC, the short circuit ratio (SCR) index is no longer applicable. Now, the multi-infeed short circuit ratio (MISCR) is mostly used to evaluate the strength of the AC power network of MIDC transmission system. In this paper, based on the influence factor method and equivalent impedance method, which are commonly used in current research, a new method is proposed to express MISCR by using the algebraic cofactor of the node admittance matrix of AC system.