New feedforward space-vector PWM method to obtain balanced AC output voltages in a three-level neutral-point-clamped converterIEEE Transactions on Industrial Electronics - Tập 49 Số 5 - Trang 1026-1034 - 2002
J. Pou, D. Boroyevich, R. Pindado
In three-level neutral-point-clamped voltage-source inverters, proper modulation allows the average voltages of the DC-link capacitors to be kept at one-half the level of the DC-link voltage. However, in some operating conditions, a low-frequency ripple appears in the neutral-point potential and its frequency is three times that of the output voltages. As a result, the output voltages also have lo...... hiện toàn bộ
#Space vector pulse width modulation #Voltage #Pulse width modulation inverters #Capacitors #Frequency #Power electronics #Power engineering and energy #Pulse width modulation #Pulse width modulation converters #Bridge circuits
A novel multicell DC-AC converter for applications in renewable energy systemsIEEE Transactions on Industrial Electronics - Tập 49 Số 5 - Trang 1048-1057 - 2002
H. Ertl, J.W. Kolar, F.C. Zach
This paper presents a novel DC-AC converter for applications in the area of distributed energy generation systems, e.g., solar power systems, fuel-cell power systems in combination with supercapacitor or battery energy storage. The proposed converter is realized using an isolated multicell topology where the total AC output of the system is formed by series connection of several full-bridge conver...... hiện toàn bộ
#Renewable energy resources #Switching converters #Distributed power generation #Power generation #Solar power generation #Solar energy #Power systems #Supercapacitors #Batteries #Energy storage
High dynamic control of a three-level voltage-source-converter drive for a main strip millIEEE Transactions on Industrial Electronics - Tập 49 Số 5 - Trang 1081-1092 - 2002
J. Bocker, J. Janning, H. Jebenstreit
A high dynamic control system for the Alspa VDM 7000 medium-voltage drive was implemented, which provides fast torque response times of a few milliseconds despite the typically low switching frequency of gate-turn-off thyristors which is necessary to achieve high efficiency. The drive system consists of a three-level voltage-source converter with active front end and a synchronous motor. The drive...... hiện toàn bộ
#Voltage control #Strips #Milling machines #Synchronous motors #Torque control #Control systems #Medium voltage #Delay #Switching frequency #Thyristors