MATLAB Implementation of Hysteresis Comparator Inverter with Code Description

A hysteresis comparator inverter is a power electronic converter based on hysteresis comparison control strategy, commonly used for generating high-quality sinusoidal AC voltage waveforms. The core principle involves real-time comparison between reference signals and output signals, utilizing hysteresis control to rapidly switch power devices, thereby reducing tracking errors and optimizing waveform quality. Implementing a hysteresis comparator inverter in MATLAB typically requires the following steps: First, establish a reference sine wave signal as the desired AC voltage output waveform. This can be achieved using MATLAB's sin() function with appropriate frequency and amplitude parameters. Next, design the hysteresis control module by setting appropriate hysteresis bandwidth to balance switching frequency and tracking accuracy. When the actual output signal deviates from the reference signal beyond the upper hysteresis limit, trigger the inverter switching action to bring the output signal closer to the reference; otherwise maintain the current state. This logic can be implemented using conditional statements (if-else) and comparison operators. This control method effectively suppresses harmonics and offers fast dynamic response, but requires careful selection of hysteresis bandwidth - too small a bandwidth leads to excessive switching frequency and increased losses, while too large a bandwidth may reduce waveform accuracy. MATLAB's Simulink tool provides intuitive simulation of this process. Using the Power System toolbox, one can build the main inverter circuit with IGBT or MOSFET modules, and observe PWM waveforms and AC voltage tracking effects through oscilloscope blocks. Key functions include voltage measurement blocks and PWM generators with hysteresis controllers. Extended considerations: Hysteresis comparison can be combined with Space Vector Pulse Width Modulation (SVPWM) to further optimize three-phase inverter performance. Additionally, introducing adaptive hysteresis bandwidth strategies can dynamically adjust switching frequency to adapt to load variations, which can be implemented using MATLAB's adaptive control algorithms and real-time parameter tuning features.