Analysis of the Power Balance in the Cells of a Multilevel Cascaded H-Bridge Converter

Abstract

Multilevel cascaded H-Bridge converters (CHB) have been presented as a good solution for high power applications. In this way, several control and modulation techniques have been proposed for this power converter topology. In this paper the steady state power balance in the cells of the single phase two cell CHB is studied. The capability to be supplied with active power from the grid or to deliver active power to the grid in each cell is analyzed according to the dc-link voltages and the desired ac output voltage value. Limits of the maximum and minimum input active power for stable operation of the CHB are addressed. Simulation results are shown to validate the presented analysis.

Reactive Power Strategy of Cascaded Delta-Connected STATCOM Under Asymmetrical Voltage Conditions

“…Carrier-phase-shifted PWM (CPS-PWM) is also used in this paper. Detailed descriptions of individual balancing control and CPS-PWM are shown in [25] and [28] respectively.…”

A Novel Multilevel Multioutput Bidirectional Active Buck PFC Rectifier

“…The point (m) is chosen to split two cells which are kind of fullbridge modules. Similarly to the work performed on cascaded H-bridge (CHB) multilevel converter [27,28], the following analysis is done to show the power balance ratio between two independent loads connected to the proposed rectifier. The following equation is visible on the rectifier structure:…”

A Modular Bi-Directional Power Electronic Transformer

“…However, because each DC capacitor is connected to two H-Bridges, the system has many faulty states as described in [49]. A multilevel rectifier based on H-Bridges was established in [50], where the CHB operated as a rectifier. The control algorithm was complex and the system can become unsteady in certain cases.…”