The industry lacks consensus on how to analyze the operational characteristics of new energy power systems. This paper examines the adaptability of three classic computations

namely

power flow computation

electromechanical transient process simulation

and short-circuit current computation

for new energy power systems from two perspectives: individual non-synchronous-machine sources and new energy plants and stations. The findings show that both individual non-synchronous-machine sources and new energy plants and stations can use the existing three basic node types in power flow computations. However

the classic electromechanical transient process simulation method applies only to simulations after three-phase symmetrical faults and requires different processing based on the synchronization control method used by the non-synchronous-machine source. For non-synchronous-machine sources or new energy plants and stations using phase-locked loop synchronization control

methods similar to load simulation can be applied during electromechanical transient process simulation. Additionally

both individual non-synchronous-machine sources and new energy plants and stations can be simulated using current sources in short-circuit current calculations.