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Comparison of zero‐sequence injection methods in cascaded H‐bridge multilevel converters for large‐scale photovoltaic integration

2016; Institution of Engineering and Technology; Volume: 11; Issue: 5 Linguagem: Inglês

10.1049/iet-rpg.2016.0621

1752-1424

Yifan Yu, Georgios Konstantinou, Christopher D. Townsend, Vassilios G. Agelidis,

Microgrid Control and Optimization

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.