Over the past years, modular multilevel converters (MMC) have been widely researched as a preferred option among voltage source converters for HVDC transmission system. The converter presents modularity to generate hi...
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ISBN:
(纸本)9781467371520
Over the past years, modular multilevel converters (MMC) have been widely researched as a preferred option among voltage source converters for HVDC transmission system. The converter presents modularity to generate high number of output voltage levels by simple series connection of modules, resulting in higher reliability and easy failure management/maintenance. Synthesis of near sinusoidal output voltage waveforms by multilevel operation requires pulse-width modulation at relatively lower switching frequencies, resulting in reduced switching losses. In this paper, asymmetrical submodules in the MMC based HVDC system have been investigated. Use of asymmetrical submodules with different capacitor voltages results in lesser number of semiconductor switches for the same number of output voltage levels, thus reducing the overall size of the converter system. The operating principle using different carrier based modulation schemes is discussed in detail. Modified voltage balancing algorithms based on well known sorting algorithm and PI controller have been investigated for their feasibility to asymmetrical-MMC operation. Simulations with preliminary experimental results are presented to validate the proposed converter operation.
Modular multilevel converters have emerged as a viable solution over conventional voltage source converters (VSC) for applications in high voltage direct current (HVDC) transmission. Due to modular structure, the conv...
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ISBN:
(纸本)9781479902248
Modular multilevel converters have emerged as a viable solution over conventional voltage source converters (VSC) for applications in high voltage direct current (HVDC) transmission. Due to modular structure, the converter can reach high number of voltage levels resulting in low switching frequency and near sinusoidal voltage waveforms. This paper proposes new submodule topologies which can result in even higher voltage levels with reduced voltage stress across some switches and lower semiconductor losses. A modified modulation scheme and voltage balancing algorithm is proposed for the new topology and is validated by MATLAB/Simulink simulations. A comprehensive comparative analysis with other available submodule topologies is presented to show the added benefits.
With rapid advancements in power semiconductor technologies, Forced Commutated Converter systems are taking the market in high voltage, high power transmission and distribution applications. The Modular Multilevel Con...
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ISBN:
(纸本)9781479912551
With rapid advancements in power semiconductor technologies, Forced Commutated Converter systems are taking the market in high voltage, high power transmission and distribution applications. The Modular Multilevel Converters have become an attractive choice for future HVDC transmission projects because of their easy scalability, full real and reactive power flow control, dynamic voltage regulation, black start capability, smaller space requirements, etc. Graduate students in universities should be made aware of these newer converters to be able to apply them in industry and research. This paper presents an overview of the different fundamental concepts of Modular Multilevel Converters and a roadmap to teaching it in a graduate level course of Power Electronics in Power Systems.
Modular multilevel converters have emerged as a viable solution over conventional voltage source converters (VSC) for applications in high voltage direct current (HVDC) transmission. Due to modular structure, the conv...
详细信息
ISBN:
(纸本)9781479902255
Modular multilevel converters have emerged as a viable solution over conventional voltage source converters (VSC) for applications in high voltage direct current (HVDC) transmission. Due to modular structure, the converter can reach high number of voltage levels resulting in low switching frequency and near sinusoidal voltage waveforms. This paper proposes new submodule topologies which can result in even higher voltage levels with reduced voltage stress across some switches and lower semiconductor losses. A modified modulation scheme and voltage balancing algorithm is proposed for the new topology and is validated by MATLAB/Simulink simulations. A comprehensive comparative analysis with other available submodule topologies is presented to show the added benefits.
With rapid advancements in power semiconductor technologies, Forced Commutated Converter systems are taking the market in high voltage, high power transmission and distribution applications. The Modular Multilevel Con...
详细信息
ISBN:
(纸本)9781479912537
With rapid advancements in power semiconductor technologies, Forced Commutated Converter systems are taking the market in high voltage, high power transmission and distribution applications. The Modular Multilevel Converters have become an attractive choice for future HVDC transmission projects because of their easy scalability, full real and reactive power flow control, dynamic voltage regulation, black start capability, smaller space requirements, etc. Graduate students in universities should be made aware of these newer converters to be able to apply them in industry and research. This paper presents an overview of the different fundamental concepts of Modular Multilevel Converters and a roadmap to teaching it in a graduate level course of Power Electronics in Power Systems.
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