DocumentCode :
2425825
Title :
An improved voltage vector control method for Neutral-Point-Clamped inverters
Author :
Rojas, Roberto ; Ohnishi, Tokuo ; Suzuki, Takayuki
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokushima Univ., Japan
fYear :
1994
fDate :
20-25 Jun 1994
Firstpage :
951
Abstract :
A new PWM method for Neutral-Point-Clamped (NPC) inverters is introduced. The method is based on closed-loop control of the line-to-line voltage vectors. It uses independent hysteresis comparator controllers to regulate the direct and quadrature axis components of the three phase output voltages. The controllers select the appropriate inverter output voltage vectors through an EPROM table. The closed-loop control allows a high performance over the whole range of operation, even when low speed devices such as the GTO are used. A neutral-point potential control is described, which is capable of stabilizing the variations within fixed limits during steady and transient states. The principle of the method is discussed and the vector selection technique is presented. The effectiveness in the output-voltage-waveform generation and the balance of the DC-link capacitor voltages are verified by simulation and experiment
Keywords :
PWM invertors; closed loop systems; controllers; voltage control; voltage regulators; DC-link capacitor voltages; EPROM table; GTO; Neutral-Point-Clamped inverters; PWM method; closed-loop control; direct axis component; hysteresis comparator controllers; line-to-line voltage vectors; neutral-point potential contro; output-voltage-waveform generation; quadrature axis component; simulation; steady states; three phase output voltages; transient states; vector selection technique; voltage vector control method; Capacitors; Circuits; Control systems; EPROM; Hysteresis; Power system harmonics; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Voltage control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Electronics Specialists Conference, PESC '94 Record., 25th Annual IEEE
Conference_Location :
Taipei
Print_ISBN :
0-7803-1859-5
Type :
conf
DOI :
10.1109/PESC.1994.373794
Filename :
373794
Link To Document :
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