Individual capacitor voltage balancing in H-bridge cascaded multilevel STATCOM at zero current operating mode
Paper in proceedings, 2015

Individual capacitor voltage balancing is one of the challenges in the field of multilevel converters, especially when the phase legs of the converter are connected in star configuration. This issue can be even more problematic when the converter is operating close to zero average current operating mode. This paper first shows the issue related to the capacitor voltage balancing at zero average-current mode and second proposes a novel algorithm to overcome this problem. The method proposes a modulation technique for individual balancing in H-bridge cascaded multilevel converters operated at zero average-current mode. The proposed algorithm modifies the conventional sorting algorithm based on current ripple. The individual DC-link voltage control method is applied to a 19-level star-connected cascaded converter in PSCAD and simulation results verify the ability of the proposed method in maintaining the balancing of the capacitors voltages at zero current injection mode. Several practical limitation such as forward voltage drop over semiconductor elements, noise in measured data, delay in the digital controller, switching deadtime, and grid voltage harmonics are also considered in the model.

Voltage Source Converter (VSC).

High voltage power converters

Static Synchronous Compensator (STATCOM)

Multilevel converters

Modulation strategy

Converter control

FACTS

Author

Ehsan Behrouzian

Chalmers, Energy and Environment, Electric Power Engineering

Massimo Bongiorno

Chalmers, Energy and Environment, Electric Power Engineering

Remus Teodorescu

Aalborg University

Jean-Philippe Hasler

ABB Corporate Research Center

17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015, Geneva, Switzerland, 8-10 September

7309220

Areas of Advance

Energy

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/EPE.2015.7309220

ISBN

978-9-0758-1523-8

More information

Latest update

2/26/2018