Abstract : This paper introduces the working principle of a matrix converter under unbalanced input conditions, studies a space vector modulation strategy with constant input current deflection angle, and establishes a corresponding simulation model using MATLAB. Through parameter setting, phase calculation, control algorithm implementation, and switching interface circuit, the constant input current deflection angle modulation strategy of the matrix converter under unbalanced conditions is realized. Simulation results verify the correctness of the modulation strategy. Keywords : Unbalanced input, matrix converter, simulation, modulation 1 Introduction With the rapid development of power electronics technology, AC-AC frequency converters have been widely used in drive systems due to their excellent speed regulation performance and significant energy-saving effect. However, due to the use of switching power devices, AC-AC frequency converters also have some inherent defects, such as excessive number of switching power components, low output frequency, and low power rating. Therefore, researching new AC-AC frequency converters that have both excellent control performance and excellent input current quality, while being low-cost, compact in structure, and reliable in performance has become the current development trend. Matrix converters are direct AC-AC converters, which have the following significant advantages over traditional converters: (1) No intermediate DC link, compact structure, small size, high efficiency, and easy modularization; (2) No need for large filter capacitors, fast dynamic response; (3) Uses bidirectional switching, bidirectional power transmission, can utilize regenerative energy, and has four-quadrant operation function; (4) Large control freedom, adjustable output voltage and frequency, and unrestricted output frequency; (5) Input power can be arbitrarily adjusted; (6) Low high-order harmonic content in output voltage and input current. [b][align=center]For details, please click: Simulation Implementation of Constant Input Current Bias Angle Modulation Strategy for Matrix Converter under Unbalanced Conditions[/align][/b]