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Space-vector pulsewidth modulation for a seven-level cascaded H-bridge inverter with the control of DC-link voltages

Lewicki A., Morawiec M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2017

Vol. 65, nr 5

619--628

A control strategy of DC-link voltages for a seven-level cascaded H-bridge inverter is proposed in this paper. The DC-link voltage balancing is accomplished by an appropriate selection of H-bridges and control of their duty cycles in space-vector modulation (SVM) algorithm. The proposed SVM method allows to maintain the same voltage level on all inverter capacitors. Regardless of the balancing function, the SVM strategy makes it possible to generate the output voltage vector properly also in the case where the DC-link voltages are not balanced. The results of simulation and experimental investigations are presented in the paper.

Simulation and Experimental validation of Distributed MPPT algorithms for partially shaded Photovoltaic systems

Muthuramalingam M, Manoharan P. S.

Przegląd Elektrotechniczny

2014

R. 90, nr 8

92-96

This paper analyzes the performance of two different maximum power point tracking (MPPT) algorithms for photovoltaic (PV) system: artificial neural network (ANN) and adaptive neuro fuzzy inference (ANFIS) as used by an interleaved soft switching boost converter (ISSBC) system with different conditions, such as partially shaded, condition, changing solar insolation and PV cell temperature. However, under partially shaded conditions, when the PV module characteristics get more complex with multiple peaks of output power. Both algorithms are methodically investigated by means of Matlab simulation and hardware experimental validation, compare in terms of parameters tracking speed, power extraction, and harmonic analysis. In this topology, each cascaded H-bridge inverter (CHBMLI) unit is connected to an individual PV module through an interleaved soft switching boost converter (ISSBC). The simulation and hardware results show that ANFIS algorithm is outperforming than the ANN algorithm.

W artykule analizowane są dwa algorytmy śledzenia maksymalnej mocy (MPPT) stosowane w systemach fotowoltaicznych: jeden (ANN) wykorzystuje sieci neuronowe a drugi wykorzystuje ANFIS. Układ pozwla na załączanie przekształtnika w zależności od warunków, np. zacienienia czy temperatury.

A Comprehensive Study of Voltage Balancing Problem of Cascaded H-bridge Inverter for Power Quality Conditioner

He Y., Liu J., Zhou F.

Przegląd Elektrotechniczny

2012

R. 88, nr 6

317-326

In recent years, multilevel technology has become an effective and practical solution for moderate and high voltage application field. In all multilevel technology, cascade multilevel inverters have become the major circuits used in power quality conditioners. Evidently,the voltage balancing problem of DC capacitors of cascade inverters is a key problem to the power quality conditioners. This paper mainly focuses on exploring the hypostasis of various voltage balancing control methods. A comprehensive theoretical analysis of voltage balancing control fundament is presented. The issue of voltage balance is discussed from output pulses of H-bridge inverters point of view, and a model for analyzing the charge and discharge process of H-bridge DC capacitor is established. Furthermore, all regulation means of output pulses of H-bridge inverters for redistributing active power is reported and quantified. The simulation results illustrate that the research is satisfactory.

Zaprezentowano teoretyczną analizę sterowania jakością napięcia w kaskadowo połczonych przekształtnikach mostkowych typu H. Przeanalizowano proces ładowania i rozładowania kondensatora. Przedstawiono badania i symulacje na przykładzie kondycjonera jakości energii.