Power Supply Capability Calculation of Urban Transmission Power System

Power supply capability(PSC) problem with N-1 static stability constraints of urban transmission network is a complex large-scale, high-dimensional, muti-constrained, non-convex and nonlinear problem. For the purpose of enhancing the PSC of urban transmission, load transfer capability of urban high voltage distribution is introduced to corrective the N-1 problem. Moreover, in order to solving PSC problem rapidly and accurately, an advanced Benders decomposition methods is proposed. The master problem is utilized to optimize the PSC operating status while the sub-problems are utilized to check N-1 problems. The iterative process of master and sub problem introduces the shift feedback factor to correct the distortion caused by nonlinear solution space linearization. A 4-bus system and a real 14-bus urban 220kV transmission system in Guangzhou, China are simulated, and the results show the proposed method finds better solution and calculates faster.