Current Ripple Prediction and DPWM-Based Variable Switching Frequency Control for Full ZVS Range Three-Phase Inverter

2021 ◽  
Vol 68 (2) ◽  
pp. 1412-1422 ◽  
Author(s):  
Jianliang Chen ◽  
Deshang Sha ◽  
Jiankun Zhang
Keyword(s):  
Frequency Control ◽  
Switching Frequency ◽  
Phase Inverter ◽  
Three Phase ◽  
Three Phase Inverter ◽  
Current Ripple

scholarly journals Modified Topology for Three-Phase Multilevel Inverters Based on a Developed H-Bridge Inverter

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1848
Author(s):  
Samuel Nii Tackie ◽  
Ebrahim Babaei
Keyword(s):  
Control Method ◽  
Frequency Control ◽  
Control Technique ◽  
Dynamic Voltage Restorer ◽  
Phase Inverter ◽  
Semiconductor Switches ◽  
Three Phase ◽  
Power Switches ◽  
Dynamic Voltage ◽  
Three Phase Inverter

This paper proposes a modified three-phase inverter from the developed H-bridge structure having multilevel functionality. The proposed topology can generate 7-levels of phase voltages and 13-levels of line voltages. Simple control methods such as fundamental frequency control method can be applied to the proposed topology. By adding three single-phase transformers, galvanic isolation is created for use in three-phase Dynamic Voltage Restorer systems. The proposed three-phase inverter utilizes less number of components; dc sources, semiconductor switches and driver circuits. Lower rated power switches with reduced blocking voltages are also used. These attributes make the proposed topology less complex in-terms of architecture and control. Comprehensive analysis of the proposed three-phase multilevel inverter and other presented topologies are investigated with respect to levels of output voltage, driver circuit quantity, dc voltage count, total component quantity and standing voltage. Details of the appropriate control technique employed is explained. Finally, practicability of the proposed inverter is validated by simulation using EMTDC/PSCAD software and experimental prototype.

Three-phase inverter with a variable control algorithm

2021 ◽  
Vol 14 (3) ◽  
pp. 1-11
Author(s):  
Grzegorz Szerszeń ◽  
Damian Zygadło
Keyword(s):  
Frequency Control ◽  
Frequency Converter ◽  
Operation Mode ◽  
Control Algorithms ◽  
Phase Inverter ◽  
Hardware System ◽  
Smooth Change ◽  
Three Phase ◽  
Control Step ◽  
Three Phase Inverter

The paper presents the construction of a three-phase frequency converter with the possibility of choosing the type of PWM modulation and a smooth change of the frequency of the modulated signal. In a practical way, various inverter control algorithms were implemented in the same hardware system using the STM ARM Cortex M3 processor. The use of THIPWM modulation allowed to reduce the harmonic content in the output signal and effectively use the possibilities of the power source. The system can choose one of two scalar control algorithms, with the option of compensation for the influence of the stator resistance on the motor shaft torque in the initial range of the linear control characteristic at a constant voltage to frequency ratio. The research confirmed that the most advantageous type of PWM in this system is unipolar double-edge modulation. The use of the THIPWM method resulted in a gain in the amplitude of the fundamental harmonic of the output voltage for the three-phase inverter operation mode compared to the SPWM method. The appropriate precision of the frequency control step was also obtained, and the test results confirmed the functionality of the converter.

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