Discrete Switching Sequence Control for Universal Current Tracking in Wind Power Converters

With increasing wind power penetration in modern grids, high-performance current control of converters is essential for efficient power transfer, harmonic reduction, and system stability. A novel discrete switching sequence control (dSSC) is proposed to ensure power converters universally track current references without steady-state error. A discrete model of the H-bridge converter is developed, together with a detailed, systematic design methodology to realize the dSSC. The resulting controller is applicable to arbitrary current references and guarantees zero steady-state error. Compared with pulse width modulation (PWM), the dSSC accounts for converter switching characteristics and provides a systematic design framework for both dynamic performance and steady-state accuracy. Moreover, the average switching frequency is approximately half that of PWM, which reduces maintenance and improves converter efficiency in wind-turbine applications. Simulation and experimental results validate the proposed method.