A Rapid Power Flow Analysis Method After UHVDC Fault Considering the Control Strategy of Automatic Equipment

摘要

The unbalanced power caused by ultra-high voltage direct current (UHVDC) fault may lead to the overload of transmission section or violation of busbar voltage in local power grid. In serious cases, it may lead to cascading faults or large-scale blackout. In order to accurately simulate the power flow distribution after large-scale power shortage and determine the validity of disposal strategy dealing with serious fault, a rapid power flow analysis method after fault considering the control strategy of automatic equipment is proposed in this paper. Considering the influences of automatic equipment to power grid operation situation on different time scales, the control strategy of power system stability control devices, the primary frequency control, automatic generation control (AGC) and automatic voltage control (AVC) is simulated. The active power of the generator and load at each stage is determined. The active power of transmission section and voltage of busbars under large-scale unbalanced power can be determined rapidly for the disposal strategy optimization. Simulation results based on actual power grid show the effectiveness and viability of the method.