Sensorless scheduling of the modular multilevel series-parallel converter: enabling a flexible, efficient, modular battery
Sensorless scheduling of the modular multilevel series-parallel converter: enabling a flexible, efficient, modular battery
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模块化多电平串并联转换器的无传感器调度：实现灵活、高效的模块化电池
DOI：
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发表时间：
2016
期刊：
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通讯作者：
S. Lukic
中科院分区：
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作者：
S. Goetz;Zhongxi Li;A. Peterchev;Xinyu Liang;Chengduo Zhang;S. Lukic
提出了一种具有串并模块连接(MMSPC)的模块化多电平转换器(MMC)的控制方法，它提供了自然的模块平衡、降低的导通损耗和增强的并行模式所提供的稳健性。在传统的MMC控制中，必须测量或估计每个模块的存储元件的电压，以使控制器能够均衡所有模块的电压。这一要求一直是MMC在低功率和中等功率应用中的关键障碍之一。相反，我们使用MMSPC的并行连接来实现模块电压平衡。它还支持模块电压和剩余模块电容的频繁并联，从而在出现电池故障的情况下实现可靠的运行。通过降低有效源阻抗，并联连接进一步降低了系统最大电压电平以下的传导损耗。这种方法使低功率和中功率MMC应用以及基于MMC的电池存储首次具有吸引力。这些都以一个实验性的MMSPC系统为例，该系统由八个电池模块组成，可以产生高质量的交流输出，而不会过滤磁件。
We present a control approach for the modular multilevel converter (MMC) with series and parallel module connectivity (MMSPC) that provides natural module balancing, reduced conduction losses, and enhanced robustness afforded by the parallel mode. In conventional MMC control, the voltage of each module's storage element has to be measured or estimated to enable the controller to equalize the voltages across all modules. This requirement has been one of the key barriers for MMCs in low and medium power applications. In contrast, we use the parallel connectivity of the MMSPC for module voltage balancing. It also enables robust operation in the presence of battery failure by supporting the module voltage with frequent parallelizations of the residual module capacitance. The parallel connectivity further reduces conduction losses at voltage levels below the system maximum by decreasing the effective source impedance. This approach renders attractive for the first time low and medium power MMC applications as well as MMC-based battery storage. These are illustrated with an experimental MMSPC system comprising eight battery modules that generates high-quality ac output without filtering magnetics.