Dynamic Power Flow Analysis Program

The Dynamic Power Flow Analysis Program serves as a critical tool in power system transient stability research, particularly for classical test models like the four-machine two-area system. This program simulates system dynamic responses under various fault conditions, enabling engineers to evaluate grid stability post-disturbance through sophisticated numerical simulations.

Core analysis scenarios include: 1) Three-phase short-circuit fault - The most severe symmetrical fault requiring monitoring of bus voltage collapse risks and power angle instability. Implementation typically involves voltage dip modeling and swing equation integration. 2) Two-phase ground short-circuit - For asymmetric faults, the program tracks negative-sequence current impacts on generators using symmetrical component transformation algorithms. 3) Single-phase ground short-circuit - Analyzes relay protection operation timing and post-fault clearance voltage recovery characteristics through time-domain differential equation solvers.

Program architecture generally comprises these modules: Network topology modeling (incorporating generator, transformer, and line parameters using admittance matrix formulation) Differential-Algebraic Equation (DAE) solver (handling electro-mechanical transient processes with implicit integration methods) Fault sequence controller (simulating precise fault inception/clearance timelines via event-driven programming) Visualization interface (plotting key metrics like power angle curves and voltage fluctuations using graphing libraries such as matplotlib or plotly)

For four-machine two-area systems, the program emphasizes inter-area oscillation modes and post-fault power redistribution. By comparing simulation results across different short-circuit types, it validates protection device configuration合理性 and provides data support for system frequency/voltage regulation strategies through parametric sensitivity analysis.