Neutral point potential balancing using synchronous optimal pulsewidth modulation of multilevel inverters in medium voltage high power AC drives

2012 ◽  
Author(s):  
Till Boller ◽  
Joachim Holtz ◽  
Akshay K. Rathore
Keyword(s):  
High Power ◽  
Neutral Point ◽  
Medium Voltage ◽  
Multilevel Inverters ◽  
Ac Drives ◽  
Pulsewidth Modulation ◽  
Point Potential

scholarly journals Research on neutral-point potential control of a three-level inverter

2019 ◽  
Vol 14 (1) ◽  
pp. 20
Author(s):  
Guangjie Fu ◽  
Xinpeng Li
Keyword(s):  
High Voltage ◽  
High Power ◽  
Control Method ◽  
Power Grid ◽  
Neutral Point ◽  
Smooth Control ◽  
Midpoint Potential ◽  
Potential Control ◽  
Point Potential ◽  
Proportional Controller

<p>Diode-clamped three-level inverters have been widely used in high voltage and high power fields because of their unique advantages. Nowadays, diode-clamped three-level inverters have become a research hotspot. In order to reduce the content of energy harmonics injected into the power grid by the inverter system, the neutral point potential needs to be controlled. This paper proposes a control method based on a proportional controller. The voltage sector was redefined and the design of the proportional controller was completed. In combination with the introduction of a new PWM technology, a smooth control of the midpoint potential was achieved. The effectiveness of the method is verified by simulation in MATLAB<em></em></p>

scholarly journals Multilevel neutral point clamped/H-bridge inverters with sinusoidal pulse width modulation

2021 ◽  
Author(s):  
Arifur Rahman Shohel
Keyword(s):  
Computer Simulation ◽  
Theoretical Analysis ◽  
High Power ◽  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Neutral Point ◽  
Medium Voltage ◽  
Modulation Technique ◽  
Sinusoidal Pulse Width Modulation

This project focuses on the topology of multilevel neutral point clamped (NPC)/H-bridge inverters and their modified modulation technique for high-power (megawatts) medium voltage (typically 6000 v) applications. A sinusodial pulse width in-phase disposition modulation is proposed for five-level NPC/H-bridge inverters. The inverter achieves good harmonic performance and low dv/dt in its output voltage waveforms in comparison to the conventional three-level NPC inverter. A seven-level NPC/H-bridge topology and its sinusodial pulse width in-phase disposition modulation are also proposed and investigated, which has better performance than the five-level inverters. Theoretical analysis and computer simulation are carried out for the proposed inverter topologies and algorithms. The output voltage waveforms and harmonic performance are verified by experiments on a five-level NPC/H-bridge inverters.

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