Analysis of Medium Voltage BTB System by Using Half Bridge Modular Multilevel Converter Topology
The modular multilevel converter topology (MMC) became potential converter topology for various high power applications. These are high voltage DC power transmission and other intertie connections of renewable energy sources to grid. The other application
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Abstract The modular multilevel converter topology (MMC) became potential converter topology for various high power applications. These are high voltage DC power transmission and other intertie connections of renewable energy sources to grid. The other application of MMC topology is variable speed drives, for controlling these variable speed drives a sine wave technique and square wave technique will be used. Particularly for high voltage direct current (HVDC) transmission applications, modular topology of voltage source converter gained attention because of its modularity, uniform modules connected in series or parallel. The other considerable advantage of MMC is their high efficiency because of low losses and the filtering requirements for harmonics are very less compared to other topologies. MMC gives increasing converter reliability and reduction of maintenance cost. This paper gives the simulation study of design of 50 Hz BTB system with 200 V and 10 kW. Two MMC-based converters connected back to back and control signals generated by using phase-shifted modulation. The main advantage of this DSC–MMC-based BTB intertie is the DC link capacitor and sensor for voltage is eliminated. The simulation study carried out for the DSC-based MMC for a 200 V, 10 kW, 50 Hz model with phase-shifted PWM. Simulation results of DSC–MMC-based BTB study and transient states are presented in this paper. Simulation carried by using MATLAB/Simulink software.
Keywords MMC topology HVDC transmission BTB link Half bridge MMC
Yasmeena (&) EEE Department, VIT Bhimavaram, Vishnupur, AP, India e-mail: [email protected] G. Tulasi Ram Das Jawaharlal Nehru Technological University Hyderabad, Hyderabad, India © Springer Nature Singapore Pte Ltd. 2018 A. Garg et al. (eds.), Advances in Power Systems and Energy Management, Lecture Notes in Electrical Engineering 436, https://doi.org/10.1007/978-981-10-4394-9_8
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Yasmeena and G. Tulasi Ram Das
1 Introduction From 1990s voltage source converters became popular for high voltage DC transmission applications. The IGBT (Gate Bipolar transistors) device is the revalorized HVDC transmission system. The VSC-based HVDC system is advantageous because it reduces the cost of filtering elements. The VSC-based HVDC system space requirement is less, the compactness of this topology gives the flexibility to install HVDC station at utilization side. The VSC-based HVDC Transmission system is faster for active and reactive power control. VSC-based HVDC is most suitable for industrial applications because of its nature of constant voltage and frequency at output. In VSC-based HVDC transmission system the grid fluctuations may not create the disturbances in output side or industrial connections if proper controlling is provided for VSC-based HVDC system. MMC is the most attractive topology for HVDC transmission application due to its ability of low harmonic content in output at high voltage ranges. The switching frequency of MMC is also less because of low voltage rating of sub-module components.
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