Comparison of zero-sequence injection methods in cascaded H-bridge multilevel converters for large-scale photovoltaic integration
Comparison of zero-sequence injection methods in cascaded H-bridge multilevel converters for large-scale photovoltaic integration
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DOI：
10.1049/iet-rpg.2016.0621
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发表时间：
2017-05
影响因子：
2.6
通讯作者：
Yifan Yu;G. Konstantinou;C. Townsend;V. Agelidis
中科院分区：
文献类型：
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作者：
Yifan Yu;G. Konstantinou;C. Townsend;V. Agelidis
由于大型太阳能光伏电站的辐照度和环境温度不同，多电平级联 H 桥 (CHB) 转换器的三相光伏 (PV) 发电水平可能会严重不平衡。需要注入零序电压来维持不平衡发电的三相平衡电网电流。本研究从理论上比较了基于两个指标的各种零序注入方法的功率平衡能力，这两个指标可以轻松推广到光伏系统的所有 CHB 应用。基于 430 V、10 kW、三相七电平级联 H 桥转换器原型的实验结果证实了最佳零序注入技术的卓越性能。
Photovoltaic (PV) power generation levels in the three phases of a multilevel cascaded H-bridge (CHB) converter can be significantly unbalanced, owing to different irradiance levels and ambient temperatures over a large-scale solar PV power plant. Injection of a zero-sequence voltage is required to maintain three-phase balanced grid currents with unbalanced power generation. This study theoretically compares power balance capabilities of various zero-sequence injection methods based on two metrics which can be easily generalised for all CHB applications to PV systems. Experimental results based on a 430 V, 10 kW, three-phase, seven-level cascaded H-bridge converter prototype confirm superior performance of the optimal zero-sequence injection technique.