Title: A simplified and generalised SVPWM method including over modulation zone for seven level diode clamped inverter - FPGA implementation
Authors: B. Sirisha; P. Satish Kumar
Addresses: Department of Electrical Engineering, Osmania University, Hyderabad, Telangana, India ' Department of Electrical Engineering, Osmania University, Hyderabad, Telangana, India
Abstract: This paper presents simplified and generalised SVPWM technique for a neutral point clamped multilevel inverter of any level. This modulation technique provides a simplistic strategy for transition between various modulation indexes with linear transfer characteristic which provides a general solution for over modulation zone. The proposed technique is based on 60° coordinate system with all the computational work is carried out online, generating the desired switching states and their sequences through simplified expressions without any additional storage requirement. This modulation technique combines the concept of reference vector modification and on duration modification during over modulation zones. The performance of the proposed technique is tested through FPGA spartan3A processor experimentally for seven level diode clamped inverter. The simulation and experimental results are validated at various modulation indexes and are in well agreement with each other.
Keywords: FPGA; SVPWM; neutral point clamped inverter; modulation index.
International Journal of Power Electronics, 2019 Vol.10 No.4, pp.350 - 366
Received: 10 Apr 2017
Accepted: 18 Aug 2017
Published online: 08 Apr 2019 *