scholarly journals Modified Space Vector Modulation for Cascaded H-Bridge Multilevel Inverter with Open-Circuit Power Cells

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Hoang Truong ◽  
Chung Mai ◽  
Cao Nguyen ◽  
Phuong Vu
Keyword(s):  
Open Circuit ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Phase Line ◽  
Common Mode Voltage ◽  
Three Phase ◽  
New Space ◽  
Modulation Control ◽  
Vector Modulation ◽  
The Impact

In this research, a new space vector modulation control algorithm is proposed to increase the reliability of the cascaded H-bridge multilevel inverters in case of faulty situations, where one or several power cells do not function. Methods to detect faults ensure finding open-circuit module exactly, which is fast and easy to program. By giving a detailed analysis of the impact of the faulty power cells, optimal redundant level states are chosen such that highest possible output voltage can be achieved, while the balance of the three-phase line-to-line voltage is maintained and common-mode voltage is reduced. The proposed algorithm is generalized so that it can be applied to H-bridge inverters of any level. The validity of the method is verified by numerical simulations and experiment results with an 11-level cascaded H-bridge inverter.

scholarly journals A Generalized Space Vector Modulation for Cascaded H-Bridge Inverters under Faulty Conditions

2021 ◽  
Vol 31 (2) ◽  
pp. 92-99
Keyword(s):  
Space Vector Modulation ◽  
Space Vector ◽  
Line Voltage ◽  
Multilevel Inverters ◽  
A Cell ◽  
New Space ◽  
Space Vectors ◽  
Modulation Control ◽  
Vector Modulation ◽  
The Impact

In this research, a new space vector modulation control algorithm is proposed to increase the reliability and the accuracy of the cascaded H-bridge multilevel inverters in case of faulty situations where one or several power cells do not function. When one or more switches of a cell are opened or shorted, that cell is considered faulty. By giving a detailed analysis on the impact of the faulty power cells on the voltage space vectors, the inapplicable voltage vectors are removed precisely. Consequently, the optimal redundant switching states are chosen such that the highest possible output voltage can be achieved. In addition, the balance of the three phases line-to-line voltage and current are maintained. The proposed algorithm is also generalized so that it can be applied to any level of H-bridge inverters. The validity of the method is verified by numerical simulations using MATLAB Simulink with an 11-level cascaded H-bridge inverter.

scholarly journals Space-vector modulation for three-phase indirect matrix converters to reduce common-mode voltage

2021 ◽  
Vol 4 (2) ◽  
pp. first
Author(s):  
Hoan Quoc Tran ◽  
Tien Manh Vu ◽  
Tuyen Dinh Nguyen
Keyword(s):  
Matrix Converter ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Common Mode ◽  
Common Mode Voltage ◽  
Output Performance ◽  
Three Phase ◽  
The Common ◽  
Vector Modulation ◽  
Zero Voltage

This paper presents a space vector modulation strategy for a three-phase indirect matrix converter to reduce the common-mode voltage and maintain the output performance. To reduce the peak value of the common-mode voltage to 57.7% of the input phase voltage, three active voltage vectors are used to generate the desired output voltage with arbitrary amplitude and frequency, instead of using both active and zero voltage vectors as in the traditional space vector modulation strategy. Although the common-mode voltage is reduced, the output waveform quality of the three-phase indirect matrix converter deteriorates due to the absence of the zero voltage vectors. To overcome this problem, the proposed space vector modulation strategy is redesigned to control the rectifier stage of the indirect matrix converter by utilizing three active current vectors instead of two as usual. Consequently, the constant average dc-link voltage is achieved, which can improve the output performance in terms of the output voltage and current harmonic distortion. The simulation is implemented by PSIM software and experimental results are provided to verify the effectiveness of the proposed space vector modulation strategy.

scholarly journals A new space vector modulation technique for quasi Z-source B4 inverter

2020 ◽  
Vol 11 (4) ◽  
pp. 1890
Author(s):  
Izni Mustafar ◽  
Naziha A. Azli ◽  
Norjulia M. Nordin
Keyword(s):  
Output Voltage ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Modulation Technique ◽  
Front End ◽  
Voltage Ripple ◽  
Three Phase ◽  
New Space ◽  
Vector Modulation ◽  
Inverter Topology

A Quasi Z-Source (qZS) network has been utilized in a B4 inverter topology to provide voltage boosting effect by turning on the upper and lower switches simultaneously which is known as zero shoot-through states. However, the design of a qZS B4 inverter is not as straightforward as adding a qZS LC impedance network to the front-end of a B4 inverter. This is because there is no zero vectors available in a B4 inverter topology to insert the shoot through zero states, as in the case of a B6 inverter. This paper proposes a new Space Vector Modulation (SVM) technique for a qZS B4 inverter. Additional zero vectors have been appropriately added and distributed in the proposed SVM to avoid altering the existing volt-sec per switching cycle for the existing active vectors. The voltage vectors switching placement is carefully designed in order to enable the voltage boosting effect for this topology without altering the initial output voltage. In addition, an approach to compensate the DC-link voltage ripple has also been taken into consideration in its initial calculation to achieve balanced output voltage. The performance of the proposed modulation technique is verified using MATLAB/Simulink. It is shown that by using the proposed modulation technique, there is an overall improvement on the line to line output voltage where by it is able to produce balanced output voltages for the three-phase loads with or without boosting effect.

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