Simulation Program Based on UPFC (Unified Power Flow Controller)

MATLAB finds extensive applications in power systems as a powerful simulation tool. It can be utilized in multiple aspects of power systems, such as transmission line analysis, transformer modeling, power load forecasting, and control systems. Among these applications, UPFC (Unified Power Flow Controller) represents a crucial power system regulation technology that enhances system stability and reliability by controlling voltage and phase angles. Consequently, UPFC-based simulation programs have gained increasing importance in power system applications.

From an implementation perspective, MATLAB's Simulink environment provides specialized toolboxe like Simscape Power Systems for modeling UPFC devices. A typical UPFC simulation involves creating voltage source converters (VSCs) using IGBT bridges, implementing PWM control strategies, and designing phase-locked loops (PLLs) for synchronization. The core algorithm typically includes dq0 transformation for decoupled control of active and reactive power, with PID controllers regulating the shunt and series converters. Key functions would involve power flow calculation using Newton-Raphson method, real-time modulation index adjustment, and protection logic implementation for overcurrent scenarios.