Project Status: Active

Regulation of Voltage and Frequency Fluctuation in a Microgrid

Objective Minimize voltage and frequency fluctuation in a microgrid under standalone operation condition using (1) Droop and supervisory control strategies; (2) Hybrid energy storage (supercapacitors and batteries) current control strategies. Features Restore grid frequency and […]

Smart current source gate driver for fast switching and cross-talk suppression of SiC MOSFET

Chunhui Liu, Qin Lei, “Smart Current Source Gate Driver for Fast Switching and Cross-Talk Suppression of SiC MOSFET” 2019 IEEE Applied Power Electronics Conference and Exposition (APEC), Anaheim, CA, 2019

Wide band gap device, like SiC and GaN, have high switching speed potential. However, the actual speed in practical use is limited by the gate loop parasitic and the interaction between high side switch and […]

Current Source Gate Driver for Series Connected Silicon-Carbide (SiC) MOSFETs

Chunhui Liu, Qin Lei, “Current Source Gate Driver for Series Connected Silicon-Carbide (SiC) MOSFETs” 2019 IEEE Applied Power Electronics Conference and Exposition (APEC), Anaheim, CA, 2019

SiC MOSFET has superior switching performance over Si IGBT in terms of power loss and temperature characteristics. In order to significantly improve the efficiency and power density of medium voltage drive and high-power converters. In […]

Design Considerations and Performance Test for SiC MOSFET Based 1000V/ 1.5MHz Pulse Power Inverter

Chunhui Liu, Qin Lei, “Design Considerations and Performance Test for SiC MOSFET Based 1000V/ 1.5MHz Pulse Power Inverter ” IEEE Energy Conversion Congress and Exposition 2018

SiC device has supreme switching performance over Si device which helps to shrink the power converter filter size and improve the converter power density. In pulse power supply area, without the tight thermal dissipation limitations, […]

A Standard Block of “Series Connected SiC MOSFET” for Medium/High voltage converter

Qin Lei, Chunhui Liu, Yunpeng Si, Yifu Liu.”A Standard Block of “Series Connected SiC MOSFET” for Medium/High voltage converter”, INTERNATIONAL POWER ELECTRONICS CONFERENCE 2018

The goal of this paper is to significantly improve the efficiency and power density of medium voltage drive and high-power converters. To achieve the goal, the proposed approach is to replace the high voltage Si […]

Control Strategy and Simulation of a Modular Multilevel Converter (MMC) based Pump-Back System for Variable Speed Drive Application

Yunpeng Si, Qin Lei, “Control Strategy and Simulation of a Modular Multilevel Converter (MMC) based Pump-Back System for Variable Speed Drive Application” IEEE Energy Conversion Congress and Exposition (ECCE) 2018, accepted.

A standard pump-back system consisting of two Modular Multilevel Converters (MMCs) has been proposed. Compared with traditional two-level inverter based pumpback system, the MMC based topology is able to produce a virtual grid with multilevel […]

New Module with Isolated Half Bridge or Isolated Full Bridge for Modular Medium voltage converter

Yunpeng Si, Yifu Liu, Qin Lei, “New Module with Isolated Half Bridge or Isolated Full Bridge for Modular Medium voltage converter“, International Power Electronics Conference (IPEC) 2018, accepted.

This paper proposes a standard module of“Isolated Half Bridge (IHB)” or “Isolated Full Bridge (IFB)” and its application in MVDC/MVAC system by using modular structure. The fundamental and 2nd harmonic current ripple can be eliminated […]

Extreme high power density T-Modular-Multilevel-Converter for medium voltage motor drive

Q. Lei, Y. Liu and Y. Si, “Extreme high power density T-modular-multilevel-converter for medium motor drive” IECON 2017 – 43rd Annual Conference of the IEEE Industrial Electronics Society, Beijing, 2017, pp. 1133-1139.

The objective of the concept of T-type Modular Multilevel Converter (TMMC) is to improve the power density of the traditional Modular Multilevel Converter (MMC) exploited in medium voltage motor drive. The size of the major […]

Energy storage system control strategy to minimize the voltage and frequency fluctuation in the microgird

Q. Lei, Y. Si and Y. Liu, “Energy storage system control strategy to minimize the voltage and frequency fluctuation in the microgird” 2018 IEEE Applied Power Electronics Conference and Exposition (APEC), San Antonio, TX, 2018, pp. 1500-1505.

The goal of this paper is to solve the voltage and frequency fluctuation problem of microgrid in the standalone operation. The proposed main idea is to use super capacitor to prevent large voltage and frequency […]

Methodology of Reliability and Power Density Analysis of SST Topologies

Wang, Kuan, Qin Lei, and Chunhui Liu. “Methodology of reliability and power density analysis of SST topologies.” Applied Power Electronics Conference and Exposition (APEC), 2017 IEEE. IEEE, 2017.

This paper proposes a reliability analysis model and a power density analysis to evaluate the Solid-State Transformer (SST) topologies for different applications. The solid-state device rating and the redundancy number are considered as two major […]