scholarly journals Single-Shunt Three-Phase Current Measurement for a Three-Level Inverter Using a Modified Space-Vector Modulation

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1734
Author(s):  
Haris Kovačević ◽  
Lucijan Korošec ◽  
Miro Milanovič
Keyword(s):  
Digital Signal Processor ◽  
Digital Signal ◽  
Current Measurement ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Ordinary Space ◽  
Phase Current ◽  
Three Phase ◽  
Vector Modulation ◽  
Current Reconstruction

This article presents a single-shunt measurement of a three-level inverter using a modified space-vector modulation to reconstruct the three-phase load current. The proposed method was implemented on a digital signal processor (DSP), and the algorithm was verified in the laboratory experiment. Through the work, it was proven that the single-shunt three-phase current measurement could be performed using the space-vector modulation for three-level inverters in an analogous way to ordinary three-phase inverters. Three-phase current reconstruction for ordinary three-phase inverters was performed using the ordinary space-vector modulation with eight vectors, but for three-level inverters, 21 vectors were available. When the inverter was working on the edges between two vectors, the modulation disturbances appeared as current spikes. This problem was solved using the modified SVM performed by shifting the SVM signals. Carefully designed signal shifting (vector injection) demonstrated an excellent reconstruction of the three-phase load currents that were single-shunt measured.

Direct Regular Sampled Pulse Width Modulation Technique for a Three-Phase Current Source Inverter

2015 ◽  
Vol 793 ◽  
pp. 226-231
Author(s):  
Syahrul Ashikin Azmi ◽  
Mohd Azrik Roslan
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Current Source ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Digital Implementation ◽  
Phase Current ◽  
Harmonic Elimination ◽  
Three Phase ◽  
Vector Modulation

This paper proposes a new regular sampled pulse width modulation (PWM) for three-phase current source inverters. The theoretical basis of the proposed modulation strategy is described, including dwell time calculations and switching sequence selection. This strategy is well suited for digital implementation, and enjoys all the flexibilities and degree of freedoms as in space vector modulation. In addition, it ensures a minimum number of switching transitions per fundamental cycle, unlike other PWM methods. It is therefore promising for high-power medium-voltage applications. The validity of the proposed modulation strategy has been confirmed using simulation and experimentation. To furthermore substantiate the superiority of the proposed modulation strategy against other PWM methods, its performance is compared to sinusoidal PWM, selective harmonic elimination, and space vector modulation.

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