Jinli Zhu

Area of research

Control and Systems Engineering · Electrical and Electronic Engineering

Research interest

Research topics from publications: EMI Issues and Reduction in 800 V Electrical Vehicle Systems by Incorporating Cable Effects; Instant Startup and Grid Synchronization of Inverter Based Resources; Sensorless Vector Control for Induction Motor Startup Using Multilevel Converters; Self-Synchronized Startup for Voltage Sensorless Grid-Tied Inverters; Instant Transformer Energization for Inverter Based Resources Based on Pre-fluxing and Virtual Resistance Control; Virtual Resistor Control for Inverter-Based Resource with Long Underground Cables; An Innovative DC-DC Converter Design Offering Exceptionally High Voltage Gain and Reduced Voltage Stress; Enhancing Stability in Wind Energy: A Robust H-infinity Approach for Permanent Magnet Synchronous Generators. Representative work: As electric vehicles (EVs) evolve, there is a notable shift in battery voltage levels from the conventional 400V to an elevated 800V. This transition offers advantages such as faster charging times, reduced energy losses, and the potential for more compact motor designs. However, this comes with a trade-off: an increased rate of voltage change (dv/dt), which can exacerbate Electromagnetic Interference (EMI) issues. The presence of cables connecting the motor to the motor drive and battery packs can further amplify these EMI challenges. Therefore, this paper initially conducts a comparative analysis of EMI performance between 400 V and 800 V EV systems. Subsequently, we introduce a filter des This paper introduces an innovative approach for instant startup of inverter-based resources (IBRs), which attains synchronization with the grid via the already embedded direct current feedback control. The startup process utilizes direct current control throughout each switching cycle, enabling a process that is free from inrush current. Uniquely, this method determines the grid phase angle by evaluating the current differences across switching cycles, a significant difference from traditional methods that often rely on grid or points of common coupling (PCC) voltage. An analytical model has been constructed, highlighting that the grid phase angle can be obtained in just two switching cycle

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