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Summary This article discloses a clamping sequence duty ratio control (CSEQ‐DRC) for photovoltaic (PV)‐fed indirect vector control (IVC) of induction motor (IM) drive. Solar PV is one of the prominent renewable green energy resources and made a pollution‐free power generation without carbon emission. The PV‐fed IM drives are used in many applications such as water pumping, electric vehicle, industrial applications, etc. However, solar panels suffer from low efficiency. Moreover, it can be overcome using the maximum power point tracking (MPPT) technique, and the MPPT is achieved using incremental conductance (Inc‐Cond). The speed of IM can be controlled using IVC with the help of an inverter. The inverter is inherently controlled based on the pulse width modulation (PWM) techniques for reducing the voltage or current harmonics. Here, the proposed CSEQ‐DRC involves two switching sequences such as CSEQ0 and CSEQ1, in every sector region. For every sector region, the appropriate sequence can be operated/selected in the less area of root mean square (RMS) of the stator flux ripples (SFRs) to reduce the line voltage/current profiles of the IM. Consequently, the torque ripples and speed fluctuations are further reduced significantly with the proposed CSEQ‐DRC than the conventional space vector duty ratio control (CSVDRC). In real‐time applications of PV‐fed IVC IM, the interface of the DSPACE DS‐1104 controller is used here to implement for both the proposed CSEQ‐DRC and CSVDRC techniques. Also, the overall performance of the IM drive is improved with the proposed technique as compared to the CSVDRC at different operating conditions.

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Summary This article presents a bidirectional isolated DC‐DC dual active bridge (DAB) converter, with an improved control strategy under constant power load (CPL) conditions. Major applications of DAB are in solid‐state transformers (SSTs), energy storage systems, dc‐microgrid, and electric vehicle, where it feeds other converters, which act as a CPLs. CPLs have negative impedance characteristics, thereby, have a destabilizing effect and impact the dynamics and stability of power converters feeding them. Maintaining the dc‐link stability and obtaining a robust control with enhanced dynamic performance is a significant challenge. This paper proposes a sliding mode control method for DAB feeding CPL in its output dc‐link. A sliding mode controller is designed to employ direct power control and maintain a constant output voltage in dc‐link for various loading conditions. Additionally, to remove the output current sensor, an output current observer is proposed for improving the reliability and decreasing the cost. The proposed method improves the transient performance, with robust control over parameter mismatch when CPL is connected to the dc‐link. The transient performance and output voltage regulation with the proposed control technique are simulated with a 3 kW DAB converter in MATLAB/Simulink environment. Furthermore, the same proposed control scheme is validated experimentally with various loading conditions.

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