Trapezoidal Current Mode for Bidirectional High Step Ratio Modular Multilevel dc-dc Converter

C. Pineda, J. Pereda, S. Neira, P. Bravo, J. Rodríguez, C. García
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Abstract

High voltage direct current (HVDC) transmission systems and low voltage direct current (LVDC) networks are becoming popular due to their advantages and present feasibility, mainly pushed by the advance in power electronics. However, one of the main drawbacks of dc networks is the lack of a dc-dc converter that performs as the ac transformer in terms of efficiency, reliability and high-step voltage ratio, specially in medium and high voltage. Modular multilevel converters are an attractive alternative because they can manage medium and high dc voltages with standard semiconductor devices, and they can achieve high efficiency with soft switching modulation, such as resonant, trapezoidal or triangular currents usually used in double active bridges (DAB). This paper proposes a novel generalized trapezoidal current mode applied to high step ratio Modular Multilevel dc-dc Converters. The proposed modulation increases the efficiency and achieves bidirectional control of the power, soft-switching and a natural balance of the voltage in the capacitors. The simulation results show the bidirectional operation and the capacitor voltage balance of the converter under different operating conditions with high efficiency (98.2%).
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双向高阶跃比模块化多电平dc-dc变换器的梯形电流模式
高压直流输电系统(HVDC)和低压直流输电网络(LVDC)由于其优点和目前的可行性而受到欢迎,这主要是由于电力电子技术的进步。然而,直流网络的主要缺点之一是缺乏在效率,可靠性和高阶电压比方面表现为交流变压器的dc-dc变换器,特别是在中高压。模块化多电平变换器是一种有吸引力的替代方案,因为它们可以用标准半导体器件管理中高直流电压,并且可以通过软开关调制实现高效率,例如双有源电桥(DAB)中通常使用的谐振、梯形或三角形电流。提出了一种适用于高阶跃比模块化多电平dc-dc变换器的新型广义梯形电流模式。所提出的调制提高了效率,实现了功率的双向控制、软开关和电容器内电压的自然平衡。仿真结果表明,该变换器在不同工作条件下均能实现双向工作和电容电压平衡,效率高达98.2%。
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