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CHB inverter with DC-link capacitor balancing and total harmonic minimization

Armi F., Manai L., Besbes M.

Archives of Electrical Engineering

2018

Vol. 67, nr 1

81--93

A cascaded H-bridge (CHB) multilevel inverter generally requires several DC sources. An alternative option is to replace the separate DC source feeding an H-bridge cell with a capacitor, while maintaining the other H-bridge cell with a real DC voltage source. In this paper a 7-level cascaded H-bridge inverter with a single DC-source is presented. This paper focuses mainly to achieve effective capacitor voltage balancing and selective harmonic elimination (SHE) based on the Newton Raphson algorithm (N–R). It shows hope to reduce the voltage ripple of the capacitors, which leads to higher power conversion efficiency with equal power distribution, reduces the initial cost, and complexity hence it is apt for industrial applications. Simulation results support the proposed control technique.

Performance Evaluation of SuperLU and PARDISO in Power System Load Flow Calculations

Khajeh Zadeh A., Zeynal H., Mohamed Nor K., Shaaban M.

Przegląd Elektrotechniczny

2011

R. 87, nr 11

290-294

This paper evaluates the performances of two direct linear system solvers, which are the SuperLU and the PARDISO, in the calculation of power system load flow. The objective is to share experience in their performance in power flow solution. There are five sub processes in a power flow algorithm. Within these sub-processes, dominant total execution times are the ones associated with the solution of a set of linear equations. Two well-known sparse direct linear system solvers are employed to carry out the computations. Results obtained show that the SuperLU solver offers a better performance by having a faster execution time in these two sub-processes for all tested cases. A variety of standard test systems, including IEEE 118 bus, 300 bus, and practical utilities of 664 bus, and FERC 4995bus are used to validate the results.

W artykule oceniono właściwości metod SuperLU i PARDISO w zastosowaniu do obliczeń przepływu obciążeń. Przeprowadzono obliczenia dla dwóch rozproszonych systemów. Stwierdzono, że SuperLU umożliwia szybsze rozwiązanie problemu. Zbadano różne standardowe systemy, jak IEEE 118 czy FERC 4995.