Power quality performance analysis for nonlinear loads in MATLAB involves assessing the impact of nonlinear loads on the electrical system's quality of power supply. Nonlinear loads, such as electronic devices, can introduce harmonic distortion, voltage fluctuations, and power factor issues, affecting the overall stability and reliability of the grid. In MATLAB, the analysis typically includes modeling the nonlinear loads using appropriate mathematical representations, such as diode rectifiers or power electronic converters, and simulating their behavior under different operating conditions. Various power quality indices, including total harmonic distortion (THD), voltage sag/swell, and power factor, are calculated to quantify the extent of power quality degradation caused by nonlinear loads. Additionally, advanced signal processing techniques and spectral analysis tools available in MATLAB can be utilized to identify and analyze harmonic components present in the system's voltage and current waveforms. By conducting power quality performance analysis in MATLAB, engineers and researchers can gain insights into the effects of nonlinear loads on the electrical network and develop mitigation strategies to ensure compliance with industry standards and regulations.