Single-Cycle Controlled Inverter

Single-cycle control is a simplified control strategy for power electronic converters, particularly suitable for inverter systems. Its core principle involves directly regulating the average value of output variables within each switching cycle, eliminating the modulation stage required in conventional control methods to achieve rapid dynamic response. In inverter applications, single-cycle control adjusts the duty ratio to ensure the output voltage tracks the reference signal within every switching period. This approach significantly reduces system complexity while maintaining satisfactory waveform quality. Unlike traditional inverters that require separate voltage-loop and current-loop controllers, single-cycle control integrates both functionalities into a single control action. When implementing MATLAB simulations, engineers typically construct the main inverter circuit topology (such as full-bridge or half-bridge configurations) and design control modules based on the single-cycle algorithm. The simulation focuses on analyzing switching device dynamics, output waveform THD (Total Harmonic Distortion), and response speed under load transients. System performance can be optimized by adjusting switching frequencies or filter parameters through parameter sweeping simulations using MATLAB's Variable Editor or Optimization Toolbox. Compared to conventional SPWM or SVPWM techniques, single-cycle control demonstrates superior dynamic response and disturbance rejection capabilities, though it requires careful consideration of circuit parameter sensitivity. MATLAB's Simulink environment provides an efficient platform for validating such control strategies, particularly suitable for exploring robustness improvements under nonlinear loads through custom S-function blocks or state-space implementations.