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Individual DC voltage balance problem is an inherent issue for cascaded H-bridge (CHB) based converter. When the CHB-based static synchronous compensator (STATCOM) is operating at zero current mode, the existing individual DC voltage balancing control techniques may not work because of the infinitesimal output current. However, the different power losses of each cell would lead to the individual DC...
In traditional battery systems, a large number of battery cells are usually connected in series and parallel with a fixed topology during operation to supply the desired voltage and current. However, this fixed configuration has low reliability, low fault tolerance, and voltage imbalance issue. This paper proposes a new modular and reconfigurable battery pack (MRBP) consisting of reconfigurable battery...
The modern Inkjet printer is able to place millions of tiny ink droplets precisely on a paper, fabric or even ceramic to create an image. The piezoelectric technique of inkjet printing employs a crystal that flexes whenever a voltage pulse is applied to the piezo transducer. A representative printing head configuration might employ a single Power Amplifier (PA) to drive up to 1024 nozzles with an...
This paper proposes a new five-level voltage source converter for medium-voltage (MV) and high-power applications. The proposed converter can operate over a wide range of voltages (2.4–7.2KV) with fewer number of power switches and components compared to the available five-level power converters. The operation of the proposed converter is studied and analyzed. To control the proposed converter, a...
Nested Neutral-Point-Clamped (NNPC) converter is a newly proposed 4-level converter. It has advantages similar to other multilevel converters but has disadvantages caused by the difficulties in balancing the voltages on its flying capacitors. This will limit its application in Variable Frequency Drive (VFD) system — an important application area for multilevel converters. In order to improve the flying...
The Cascaded H-Bridge (CHB) topology is widely employed in high power and high voltage applications due to advantages of the low dv/dt, the low EMI noise, and the low filter inductance. An issue of this modular system is the possible unequal thermal stress of the power semiconductors in the cells, which is affecting the reliability and leads to maintenance costs and down-times. In this paper, the...
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