Energy-Balance Control of PV Cascaded Multilevel Grid-Connected Inverters Under Level-Shifted and Phase-Shifted PWMs

Chavarria, Javier; Biel, Domingo; Guinjoan, F.; Meza, Carlos; Negroni, J.J.

doi:10.1109/tie.2012.2186108

Cited by 349 publications

(147 citation statements)

References 31 publications

(50 reference statements)

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“…The DClink voltages can be equalized by sharing the generated output voltage between the H-Bridges [14], by modifying their modulation indexes [15] or using fuzzy logic control loop [11]. The uniform DC-link voltage distribution can be also maintained using separate controllers for each of the H-Bridges of grid-connected CHB inverter [16].…”

Section: The Pet Control System and Strategymentioning

confidence: 99%

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Power electronic transformer based on cascaded H-bridge converter

Morawiec¹,

Lewicki²

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. In this paper the control strategy of power electronic transformer (PET) is proposed. The analyzed structure of PET uses two seven-level cascaded H-bridge (CHB) rectifiers. The electrical power of PET is transferred between DC-links of CHB converters using dual-active-bridges (DABs) and low voltage high frequency transformers. The roposed solution allows for controlling the active and reactive power with a low level of harmonic distortions. The DC-link voltages and the load of the utilized H-bridges are controlled using appropriate modulation strategy. The theoretical issues are confirmed by simulation and experimental results. Each cell of a CHB converter includes an single-phase inverter, a capacitive DC-link and a rectifier. The voltage sources connected to the cells have to be independent or isolated [7,12]. The galvanic isolation can be realized using grid-connected single-phase or multi-phase transformers [7] or using isolated DC-DC converters in CHB converter topology [13]. The application of DC-DC converters with high-or medium-frequency transformers makes the inverter cheaper and smaller. This paper concentrates on the structure and the control system of a power electronic transformer which is based on double CHB inverters. Such a PET configuration is presented in Fig. 1. The structure of power electronic transformer consists of two seven-level CHB converters, and the single cell of PET is shown in Fig. 2. The DABs with MF transformers transfer the energy between DC-link circuits. The presented solution reduces the size and cost of overall converter structures. The main task of the control algorithms for single CHB inverter is to generate the output voltage correctly and to maintain uniform voltage distribution on the DC-link capacitors. While the output voltage is generated, the DC-link voltages of the CHB converter vary depending on the CHB output voltage and current. The DC-link voltages can be equalized by sharing the generated output voltage between the H-bridges [14], by modifying their modulation indexes [15] or using fuzzy logic control loop [11].

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Section: The Pet Control System and Strategymentioning

confidence: 99%

“…65 (5) 2017 M. Morawiec and A. Lewicki The uniform DC-link voltage distribution can also be maintained using separate controllers for each of the H-bridges of grid-connected CHB inverter [16].…”

Section: Introductionmentioning

confidence: 99%

Power electronic transformer based on cascaded H-bridge converter

Morawiec¹,

Lewicki²

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…The conventional two-stage CHB boost-five-level inverter has two capacitors two boost inductors, two diodes, ten switches, one filter inductor and a resistive load are utilized in the conventional CHB-BFLI. The boost DC-DC converter is used to control the DC-link voltage on each H-bridge circuit[5]- [40]. Both the top and bottom switches in the same leg cannot be switched on simultaneously because the DC-link capacitor is connected to each leg in parallel.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Quasi Cascaded H-Bridge Five-Level Boost Inverter

Devika¹,

M²,

Rajkumar³

2018

int. jour. eng. com. sci

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Abstract:Multilevel inverters have become more attractive for researchers due to low total harmonic distortion in the output voltage and low electromagnetic interference. This paper proposes a novel single-stage quasicascaded H-bridge five-level boost inverter. The proposed quasi cascaded h-bridge five-level boost inverter has the advantages over the cascaded H-bridge quasi-Z-source inverter in cutting down passive components. Consequently, size, cost, and weight of the proposed inverter are reduced. A capacitor with low voltage rating is added to the proposed topology to remove an offset voltage of the output AC voltage when the input voltages of two modules are unbalanced. Besides, sinusoidal pulse width modulation techniques used here. PID controller is used to control the capacitor voltage of each module. This paper presents circuit analysis, the operating principles, and simulation results of the proposed system.

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“…The power conversion interface [2]- [4] is important to grid connected solar power generation systems because it converts the dc power generated by a solar cell array into ac power and feeds this ac power into the utility grid. An inverter is necessary in the power conversion interface to convert the dc power to ac power.…”

Section: Iintroductionmentioning

confidence: 99%

“…Conduction loss results from the use of active devices, while the switching loss is proportional to the voltage and the current changes for each switching and switching frequency. A filter inductor is used to process the switching harmonics [4] of an inverter, so the power loss is proportional to the amount of switching harmonics.…”

Section: Iintroductionmentioning

confidence: 99%

Seven Level Inverter by Using Fuzzy Logic in Solar Power Generation

2017

IJAERD

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Energy-Balance Control of PV Cascaded Multilevel Grid-Connected Inverters Under Level-Shifted and Phase-Shifted PWMs

Cited by 349 publications

References 31 publications

Power electronic transformer based on cascaded H-bridge converter

Power electronic transformer based on cascaded H-bridge converter

Simulation of Quasi Cascaded H-Bridge Five-Level Boost Inverter

Seven Level Inverter by Using Fuzzy Logic in Solar Power Generation

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