Abstract: An analytical evaluation method for output waveform quality of synchronized space vector PWM strategies applied in high-power medium-voltage three-level inverters was proposed. The equivalent relationship between the mass center of the trajectory of current ripple vectors and the amplitude of the mean current ripple vector in each sample period was established. Closed-form expressions of the amplitude of the mean current ripple vector for different switching sequences were derived out. Furthermore, closed-form expressions of the amplitude of the mean current ripple vector for different modulation strategies could also be derived out. Taking continuous modulation strategy and five kinds of discontinuous modulation strategies as examples, the expressions were validated through Fourier analysis of the experimental results. Thus, the proposed evaluation method is helpful in the design of switching sequences for synchronized modulation strategies, as well as the comparison of different strategies.