No abstract

The rise in the number of electric vehicles used by the consumers is shaping the future for a cleaner and energy-efficient transport electrification. The commercial success of electric vehicles (EVs) relies heavily on the presence of high-efficiency charging stations. This article reviews the design and evaluation of different AC/DC converter topologies of the present status and future implementation plans for DC fast-charging infrastructures. The design and evaluation of these converters are presented, analysed, and compared in terms of output power, component count, power factor, and total harmonic distortion effectiveness and reliability. This paper also evaluates the architecture, merit, and demerits of AC/ DC converter topologies for DC fast-charging stations. Based on this analysis, it has found that the Vienna rectifier is the best suitable converter topology for the high-power DC fast-charging infrastructure (> 20 kW), thanks to its low current ripples, low output voltage ripples, high efficiency, high power density, and high reliability. The paper focuses specifically on different topologies of Vienna rectifier topologies on Level-3 DC fast-charging stations which direct to less CO 2 emissions in electric vehicle charging stations, thus contributing to sustainable development goals of climatic action.

Vienna rectifiers have gained popularity in recent years for AC to DC power conversion for many industrial applications such as welding power supplies, data centers, telecommunication power sources, aircraft systems, and electric vehicle charging stations. The advantages of this converter are low total harmonic distortion (THD), high power density, and high efficiency. Due to the inherent current control loop in the voltage-oriented control strategy proposed in this paper, good steady-state performance and fast transient response can be ensured. The proposed voltage-oriented control of the Vienna rectifier with a PI controller (VOC-VR) has been simulated using MATLAB/Simulink. The simulations indicate that the input current THD of the proposed VOC-VR system was below 3.27% for 650V and 90A output, which is less than 5% to satisfy the IEEE-519 standard. Experimental results from a scaled-down prototype showed that the THD remains below 5% for a wide range of input voltage, output voltage, and loading conditions (up to 2 kW). The results prove that the proposed rectifier system can be applied for high power applications such as DC fast-charging stations and welding power sources.

No abstract

There is a growing need for stability enhancement in modern electrical networks integrated with wind energy, particularly due to different oscillation modes disturbances. Power system stabilizers (PSSs) are used to mitigate oscillations and improve the stability of the power system. This paper presents a comprehensive analysis of single-band PSS1A and multi-band PSS4C (MB-PSS4C) connected to the ST1A excitation system. An efficient approach in the selection of the parameters of MB-PSS4C using Particle Swarm Optimization (PSO) is proposed. A comparative investigation linked to the common Pattern Search and Simplex Search, from previous work, has been conducted to gauge the efficacy of PSO. The generator's transient stability with considerations of relative power angle (power angle differences), speed deviation, and active power of synchronous generators (SGs) are analyzed. Different wind penetration levels ranging from 36MW to 108 MW are integrated into the network and are investigated. Results demonstrate that PSO-MB-PSS4C connected to ST1A stabilizes the system effectively with reduced settling time while mitigating the peak power angle differences of SGs. Reduced settling time of 1.35 s is observed for wind penetration of 48 MW, with 43.31 ͦ peak power angle; while for high wind penetration of 108 MW, the settling time is around 8 s with peak power angle of 43.9 ͦ .