Maximum restorable load for substation during power system restoration

In power system reconfiguration after successful black start, the maximum restorable load that substation can pick up at one time should be given. Presently, researches about the problem usually concentrate on frequency constraint and steady-state voltage constraint. In this paper, a method that can give the maximum restorable load is proposed which considers transient voltage-dip acceptability (TVDA) as a constraint. Firstly, a two-element table describing the requirements on TVDA for each bus is determined. Secondly, the maximum load restoration model is established which can give the maximum load amount for substation. Some system components, such as generator, inductive motor and network, are simplified with certain precision in order to improve the calculation speed. For improving the convergence speed, the modified dichotomy theorem which includes the improved margin for TVDA is used in the iteration. The proposed method is realized by using Borland C++ Builder and practical Shandong power system is used to verify its validity and effectiveness.