Modulation and Active Midpoint Control of a Three-Level Three-Phase Dual-Active Bridge DC-DC Converter under Non-Symmetrical Load

Philipp Joebges, A. Gorodnichev, R. D. De Doncker
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引用次数: 7

Abstract

This paper discusses the operation of a three-phase three-level dual-active bridge (3L-DAB3) dc-dc converter in medium-voltage dc (MVDC) grids with a symmetrical monopole configuration. Due to the demand of bipolar mode operation, active control of the midpoint potential is essential to ensure balanced grid voltages even under non-symmetrical loads. The proposed solution is achieved with a novel modulation scheme, which allows a power and midpoint control to enable voltage balancing. Due to the large number of degrees of freedom, look-up tables (LUTs) are generated and used to operate with a maximum converter efficiency. The proposed method is implemented and validated in simulations and on a low-power prototype setup.
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非对称负载下三电平三相双有源桥式DC-DC变换器的调制与有源中点控制
本文讨论了一种三相三电平双有源桥式(3L-DAB3) dc-dc变换器在具有对称单极结构的中压直流(MVDC)电网中的工作原理。由于双极模式运行的需要,即使在非对称负载下,也必须对中点电位进行主动控制,以确保电网电压平衡。提出的解决方案是通过一种新颖的调制方案实现的,该方案允许功率和中点控制以实现电压平衡。由于大量的自由度,查找表(lut)被生成并用于以最大的转换器效率运行。该方法在仿真和低功耗样机上得到了实现和验证。
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