Search query: three level converter t design

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abstract: Although the maximum collector emitter voltage of a high voltage insulated gate bipolar transistor (HV IGBT) reaches 3300 V or higher, it still cannot satisfy the requirements of some high voltage high power converters. Applying power semiconductor devices in series connection can effectively improve the voltage rating and power rating of a power electronic converter. The key issue of device series connection is voltage balancing in static switching state and dynamic switching state. In this paper, a three level converter based on series connected HV IGBTs is presented, its voltage balancing subcircuits are analyzed, and the parameter design method for the converter is proposed. During the design process, key performance indexes of the series connection circuit, such as the voltage balancing effect, loss of the voltage balancing circuit, switching loss, and switching time, are comprehensively considered. Moreover, component parameters of the three level converter are calculated considering the influence of the voltage balancing circuit. The proposed parameter design method is applied in the development of a three level HV IGBT (4500 V/600 A) series connection test platform with 10 000 V rated dc link voltage. Experimental results verify the validity of the proposed method.
author_names: Ting Lu

Zhengming Zhao

Hualong Yu

Shiqi Ji

Liqiang Yuan

Fanbo He
title: Parameter Design of a Three Level Converter Based on Series Connected HV IGBTs
venue: IEEE Transactions on Industry Applications
year: 2014

abstract: This paper presents the design and analysis of a three level hybrid boost converter based on a single phase three level T type inverter. The proposed converter can provide high energy conversion efficiency and high voltage gain capability with reduced component count. The pulse width modulation signals of the proposed converter are generated by comparing two duty cycles and two triangular carrier signals. The proposed converter consists of four power switches, four diodes, an inductor, and two capacitors. Detailed converter operations at each switching state with the corresponding voltage and current waveforms of each component are discussed. The functionality and performance of the proposed converter are verified through simulation and experimental results.
author_names: Norhassanah Osman

Mohamad Fathi Mohamad Elias

Nasrudin Abd Rahim
title: Design and analysis of three level hybrid boost converter based on T type inverter for solar photovoltaic system
venue: IET Power Electronics
year: 2020

abstract: Output voltage of renewable energy sources, such as fuel cell and PV cell, is often low and varies widely with load and environmental conditions. Therefore, the high step up DC DC converter is needed between renewable energy sources and the grid connected inverter. However, voltage stress of rectifier diodes is high and filter is large in traditional voltage source converters in a wide input voltage range. In order to solve the aforementioned problems, a full bridge (FB) three level (TL) converter is proposed. It can operate at both two level and three level modes, so it is suitable for wide input voltage range application. Compared with FB converter, voltage stress of rectifier diodes and the filter can be reduced. Operating principle and control strategy of the proposed converter are illustrated. Design guidelines and example are given. Simulation results of a 1 kW FB TL converter verify the theoretical analysis.
author_names: Zhilei Yao

Jing Xu

Josep M Guerrero
title: Control and design of full bridge three level converter for renewable energy sources
venue: 2015 IEEE 16th Workshop on Control and Modeling for Power Electronics (COMPEL)
year: 2015

abstract: This paper presents the results of a low voltage power converter circuit topology analysis and implementation for electric drive applications. The analysis was conducted for power modules topologies with a rated current of 300 400 A and DC bus voltage of 650 V. The power losses of most popular industrial two and three level topologies based on silicon insulated gate bipolar transistors and silicon carbide metal oxide semiconductor field effect transistors were analyzed at variations of the power factor, modulation index and pulse width modulation frequency. This research was done for power modules of different topologies in various applications. As a result, three level T type circuit topology was selected due to optimal ratio between the power losses, a price and a module size at the pulse width modulation frequency of 16 kHz. There are presented features of the power losses of the T type circuit topology, such as the higher power losses at the lower modulation index. Finally, the driver prototype is presented. There is predicted the efficiency of 98.4% at a rated power of 39 kW. The experimental results demonstrate the reduction of induction load overheating about 30% in comparison with the conventional two level converter.
author_names: Sergey Volkov

Mikhail Tiapkin

Gennadiy Tiapkin
title: Analysis and Design of Three Level Low Voltage Converter for Electric Drive Applications
venue: 2020 27th International Workshop on Electric Drives: MPEI Department of Electric Drives 90th Anniversary (IWED)
year: 2020

abstract: Multilevel technology and power semiconductor devices in series connection can both effectively improve the converter system power capacity. But both of them will enlarge the system size and lead to complex busbar structure which may cause large stray parameters, especially the stray inductances. Large stray inductance has a critical effect during the device transient process and may cause device damage and failure. Therefore, the laminated busbar structure is widely used in high power converters to decrease the wiring stray inductances. In this paper, based on the current commutation loop (CCL) analysis of a 3 level high voltage insulated gate bipolar transistor (HVIGBT) series bridge, the structure design method of the 3 level HVIGBT series connection test platform is described. The influence of the laminated busbar to the adjacent busbar is analyzed and the improved stray parameter calculation method is proposed. The experimental results verify the validity of the structure design method and the veracity of the stray parameter calculation method.
author_names: Hualong Yu

Zhengming Zhao

Ting Lu

Liqiang Yuan

Shiqi Ji
title: Laminated busbar design and stray parameter analysis of three level converter based on HVIGBT series connection
venue: 2015 IEEE Applied Power Electronics Conference and Exposition (APEC)
year: 2015

abstract: A novel hybrid resonant zero voltage zero current switching three level converter with capacitive output filter is proposed in this paper, which undergoes half of the input voltage for switches and is suitable for offshore wind farms in medium voltage dc (MVDC) collection systems. The proposed converter, utilizing two transformers with very different power ratings, adopts insulated gate bipolar transistors for all six power switches and operates in discontinuous current mode and can achieve zero current switching for the four main switches and rectifier diodes over the whole load range. Meanwhile, the auxiliary switches with small current rating can realize zero voltage switching naturally. Hence, the switching loss is reduced, which is vital in MVDC applications. By the trajectory formulas of the resonant current and voltage, the trajectory paths can be achieved, which is helpful to compare the peak and turn off currents of switches. The design rules of main parameters can be deduced with the trajectory formulas and paths. The influence of the turns ratio of auxiliary transformer and the resonant capacitance on the peak and turn off currents is discussed in detail. The operation principles of the proposed converter are analyzed and verified by the simulation and experimental results.
author_names: Guangfu Ning

Wu Chen

Liangcai Shu

Jianfeng Zhao

Wu Cao

Jun Mei

Chun Liu

Guangyao Qiao
title: A Hybrid Resonant ZVZCS Three Level Converter for MVDC Connected Offshore Wind Power Collection Systems
venue: IEEE Transactions on Power Electronics
year: 2018

abstract: Multi level converters in the mid and high voltage wind power grid applications has been widely studied and applied. Based on the diode neutral point clamped three level converter as the research object, the neutral point potential imbalance in dc side was the fatal weakness of the converter, which could affect the reliability of three level converter. A hardware circuit to solve the problem of neutral point potential balance in the three level converter was presented. Compared to other solutions to the neutral point potential balancing hardware circuit, this circuit does not only make the neutral point potential balance, but also reduce the circuit device. Therfore it can reduce the circuit complexity and the operating costs. Finally, the simulation analysis of the program using MATLAB SIMULINK simulation software indicates that the neutral point potential could achieve balance, so the correctness of the program was verified.
author_names: Dong Wei-guan
title: Design and Improved of Diode Neutral Point Clamped Three level Converter
year: 2014

abstract: The adoption of SiC devices in high power applications enables higher switching speed, which requires lower circuit parasitic inductance to reduce the voltage overshoot. This paper presents the design of a busbar for a 500 kVA three level active neutral point clamped (ANPC) converter. The layout of the busbar is discussed in detail based on the analysis of the multiple commutation loops, magnetic canceling effect, and DC link capacitor placement. The loop inductance of the busbar is verified with simulation, impedance measurements, and converter experiments. The results match with each other, and the inductances of small and large loop are 6.5 nH and 17.5 nH respectively, which is significantly lower than the busbars of NPC type converters in other references.
author_names: Handong Gui

Ruirui Chen

Jiahao Niu

Zheyu Zhang

Fred Wang

Leon M Tolbert

Daniel J Costinett

Benjamin J Blalock

Benjamin B Choi
title: Design of Low Inductance Busbar for 500 kVA Three Level ANPC Converter
venue: 2019 IEEE Energy Conversion Congress and Exposition (ECCE)
year: 2019

abstract: This paper presents the design of closed loop controllers operating a single phase AC DC three level converter for improving power quality at AC mains. Closed loop inhibits outer voltage controller and inner current controller. Simulations of three level converter with three different voltage and current controller combinations such as PI Hysteresis, Fuzzy Hysteresis and Fuzzy tuned PI ysteresis are carried out in MATLAB/Simulink. Performance parameters such as input power factor and source current total harmonic distortion (THD) are considered for comparison of the three controller combinations. The fuzzy tuned PI voltage controller with hysteresis current controller combination provides a better result, with a source current THD of 0.93% and unity power factor without any source side filter for the three level converter. For load variations of 25% to 100% a THD of less than 5% is obtained with a maximum value of only 1.67% Finally, the fuzzy tuned PI voltage with hysteresis controller combination is implemented in a Xilinx Spartan 6 XC6SLX25 FPGA board for experimental validation of power quality enhancement. A prototype 100 W, 0 24 48 V as output converter is considered for the testing of controller performance. A source current THD of 1.351% is obtained in the experimental study with a power factor near unity. For load variations of 25% to 100% the THD is found to be less than 5% with a maximum value of only 2.698% in the experimental setup which matches with the simulation results.
author_names: J Gnanavadivel

N Senthil Kumar

P Yogalakshmi
title: Comparative Study of PI, Fuzzy and Fuzzy tuned PI Controllers for Single Phase AC DC Three Level Converter
year: 2017

abstract: This letter proposes a new three level dc/dc converter configuration for a hybrid energy storage system (HESS) in dc microgrids. It effectively integrates different energy storage devices (ESDs) such as battery and ultracapacitor (UC) using one converter with bidirectional power flow. Furthermore, the proposed converter provides the flexibility of independent regulation of different ESDs with significantly reduced inductor current ripple due to the availability of three voltage levels. The voltage ratings of power semiconductors employed in this converter are also reduced. To further enhance the performance of HESS, a constant switching frequency based model predictive current control is employed for HESS regulation. The design guideline and operating principle of the proposed converter are discussed. Experimental results are presented to verify the efficacy of the proposed converter and control.
author_names: Xinan Zhang

Benfei Wang

Ujjal Manandhar

Hoay Beng Gooi

Gilbert Hock Beng Foo
title: A Model Predictive Current Controlled Bidirectional Three Level DC/DC Converter for Hybrid Energy Storage System in DC Microgrids
venue: IEEE Transactions on Power Electronics
year: 2019