To obtain the distribution of voltage stability weak buses (VSWB) for power system with multiple power sources integrated, so as to provide a basis for voltage stability control, an analysis method under full time frame is proposed in this paper. Based on the modeling of multiple power sources, combined with the load prediction, the active power output prediction of wind and photovoltaic power and the generation scheduling of conventional power, considering different patterns of load increase and power output increase and allocation of multiple power sources, within a certain period of time and for the specifically selected time sections, the continuation power flow method is respectively used to get the voltage stability critical point (SNB point), where modal analysis is applied, so that the VSWB are obtained of the certain time section. The same calculation is carried out for all the time sections selected, and then the distribution and occurrence frequency of VSWB are summed up, thereby acquiring the concrete condition of VSWB within such certain time period. Its considered that the condition of VSWB can be affected by the different integration buses and penetration rates of multiple power sources. The proposed method is verified on the IEEE 118-bus system, as well as the fact with practical significance that the condition of VSWB varies with the difference of integration buses and the penetration rates of multiple power sources.
Effect of Probabilistic Pattern on System Voltage Stability in Decentralized Hybrid Power System