A High-Frequency Link Multilevel Cascaded Medium-Voltage Converter for Direct Grid Integration of Renewable Energy Systems

Islam, Md. Rabiul; Guo, Youguang; Zhu, Jun

doi:10.1109/tpel.2013.2290313

Cited by 261 publications

(98 citation statements)

References 37 publications

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“…Based on this V CE@100 FIT voltage value, another metric named "device voltage utilization factor (DVUF)" can be defined to choose an IGBT for cost-efficient design [18]. DVUF is defined as:…”

Section: Choosing Semiconductor Switches For the Npc Invertermentioning

confidence: 99%

A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems

et al. 2017

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Abstract:A modular multilevel power converter configuration for grid connected photovoltaic (PV) systems is proposed. The converter configuration replaces the conventional bulky line frequency transformer with several high frequency transformers, potentially reducing the balance of systems cost of PV systems. The front-end converter for each port is a neutral-point diode clamped (NPC) multi-level dc-dc dual-active bridge (ML-DAB) which allows maximum power point tracking (MPPT). The integrated high frequency transformer provides the galvanic isolation between the PV and grid side and also steps up the low dc voltage from PV source. Following the ML-DAB stage, in each port, is a NPC inverter. N number of NPC inverters' outputs are cascaded to attain the per-phase line-to-neutral voltage to connect directly to the distribution grid (i.e., 13.8 kV). The cascaded NPC (CNPC) inverters have the inherent advantage of using lower rated devices, smaller filters and low total harmonic distortion required for PV grid interconnection. The proposed converter system is modular, scalable, and serviceable with zero downtime with lower foot print and lower overall cost. A novel voltage balance control at each module based on power mismatch among N-ports, have been presented and verified in simulation. Analysis and simulation results are presented for the N-port converter. The converter performance has also been verified on a hardware prototype.

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Section: Choosing Semiconductor Switches For the Npc Invertermentioning

confidence: 99%

A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems

et al. 2017

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“…A medium-frequency magnetic-link based novel medium-voltage MMC multilevel converter system was proposed as shown in Fig. 17, to eliminate the grid-side step-up-transformer, which is desirable for both onshore and offshore WTPGS [94][95][96]. In 2013, an amorphous alloy-based mediumfrequency magnetic-link was proposed to generate isolated and balanced multiple dc supplies for the MMC converter [97,98].…”

Section: Medium-frequency Magnetic Link-based Medium-voltage Convertermentioning

confidence: 99%

A review of offshore wind turbine nacelle: Technical challenges, and research and developmental trends

Islam

Guo

Zhu

2014

Renewable and Sustainable Energy Reviews

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109

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The turbine nacelle with traditional wind power generation system is heavy, especially in offshore applications due to the large mass of the power frequency step-up transformer operated at 50 or 60 Hz, and copper conductor generator. For example, the weight and volume of a 0.69/33 kV 2.6 MVA transformer are typically in the range of 6-8 t and 5-9 m 3 , respectively. The weight for a 10 MW direct drive permanent magnet generator is about 300 t. These penalties significantly increase the tower construction, and turbine installation and maintenance costs. The tower cost represents 26% of the total component cost of the turbine and on average about 20% of the capital costs are associated with installation. Typical maintenance cost of an offshore wind turbine is about 2.3 cents/kWh, which is 20% higher than that of an onshore based turbine. As alternative approaches to achieve a compact and lightweight offshore wind turbine nacelle, different concepts have been proposed in recent years, such as step-up-transformer-less system, medium-frequency (in the range of a few kHz to MHz) power transformer-based system, multilevel and modular matrix converter-based system and superconducting generator-based system. This paper aims to review the challenges, current research and development trends, possible future directions of the research to reduce the weight and volume of the nacelle. In addition, a comprehensive review of traditional wind power generation technologies is conducted in this article as well. Keywords:Offshore wind farm, power generation, research and development, compact and lightweight nacelle 2

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“…These converters can handle quite different operation levels of DGs and energy storage units, but with relatively complex structures and control systems. Finally, different interfacing converter topologies such as Z-source converters [14], multi-level converters (neutral point clamp (NPC) [15,16], cascaded H-bridge [17], multimodular converter [18,19], etc. ), soft-switching converters, matrix converters, etc., have been used in microgrids as DGs interfacing power electronics.…”

Section: Interfacing Converter Topologiesmentioning

confidence: 99%

Overview of control, integration and energy management of microgrids

Nejabatkhah

2014

J. Mod. Power Syst. Clean Energy

112

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Microgrids are being developed as a building block for future smart grid system. Key issues for the control and operation of microgrid include integration technologies and energy management schemes. This paper presents an overview of grid integration and energy management strategies of microgrids. It covers a review of power electronics interface topologies for different types of distributed generation (DG) units in a microgrid, a discussion of energy management strategies, as well as the DG interfacing converter control schemes. Considering the intermittent nature of many renewable energy based DG units, the ancillary services of DGs using the available interfacing converter rating are also discussed in the paper.

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A High-Frequency Link Multilevel Cascaded Medium-Voltage Converter for Direct Grid Integration of Renewable Energy Systems

Cited by 261 publications

References 37 publications

A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems

A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems

A review of offshore wind turbine nacelle: Technical challenges, and research and developmental trends

Overview of control, integration and energy management of microgrids

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