This study focuses on enhancing AC current regulation in three-phase grid-tied voltage source converters (VSCs) equipped with an LCL filter, which are commonly used in distributed generation applications. Conventional controllers like proportional-integral (PI) and proportional-resonant (PR) are typically utilized to minimize steady-state errors at the fundamental frequency. However, mitigating higher-order harmonics remains a challenge. To address this, a proportional-resonant with multi-resonant (PR-MR) control strategy is integrated into the current control loop to effectively suppress harmonics caused by dead-time effects and grid voltage distortions. A structured control design approach is proposed, along with a detailed stability assessment of the system. Experimental validation reveals a significant decrease in total harmonic distortion (THD) of grid currents, reaching approximately 1.1% under distorted grid conditions, thereby ensuring compliance with IEEE 1547 standards. The control scheme is deployed on a TMDSDOCK28379D 32-bit floating-point DSP. Performance evaluations are conducted using MATLAB/Simulink simulations and further verified through hardware experiments on a 7.5 kW three-phase LCL-filtered VSC operating under the proposed control framework.

This paper presents the implementation of the proportional resonant plus multi-resonant (PR-MR) and practical proportional resonant plus multi-resonant (PMR-MR) harmonic controllers in the current control loop to mitigate the high-order harmonic currents. The harmonic controllers, of orders 5th, 7th, 11th, and 13th with proper discretization methods are added to the fundamental controller in the stationary reference frame to mitigate the grid current harmonics caused by the distorted grid voltages. An extensive current control design procedure, proper methods of discretization of the resonant controllers, and system stability analysis are presented. The experimental grid currents show a lower total harmonic distortion close to 1.1% under the distorted grid conditions and comply with the IEEE 1547 standard. The PR-MR and PMR-MR controllers were implemented on the TMDSDOCK28379D 32-bit floating-point digital signal processor. The system is simulated in MAT-LAB/Simulink environment and experimentally implemented on a 7.5 kW three-phase LCL-filtered grid-connected VSC with the proposed control schemes.

Silicon carbide (SiC) half-bridge power modules are used in different applications such as power converters, integrated vehicle systems, aviation, and actuation systems. It can be a challenge, to effectively choose the optimal dead-time during the hard-switching. Since the transistor has less conducting loss in comparison to the intrinsic body diode. Therefore, it is commonly replaced with the freewheeling diode with a high-or low-side transistor for synchronous converters. Therefore, it is important to select appropriate dead-time between the low-and high-side transistors in half-bridge power modules. The use of the intrinsic body diode as a free-wheeling diode or switch instead of that in the half-bridge configuration depends on many different factors such as efficiency, cost, and switching parameters of semiconductors. This paper analyzes the behavior of the SiC power module with switching parameters under different dead-time conditions. The behavioral analysis is experimentally implemented on a half-bridge SiC for a 1200V half-bridge BSM300D12P2E001 SiC power module.

The converter design for automotive applications is a challenge, because requirements like low size, weight and costs are at odd with requirements like high efficiency. The objective of this paper is to find a size and cost optimized design for an automotive on-board power supply. The investigated topology is a push-pull half-bridge converter with current doubler, where the discrete as well as the magnetically integrated current doubler will be taken into account and compared to each other. Therefore total filter size was calculated dependent on the operation frequency in order to find the most appropriate tradeoff between converter size and losses. Additionally the converter efficiency of an assembled prototype was measured for different semiconductor configurations to evaluate the suitability of different semiconductor technologies.