Optimization-based Cell Selection Method for Grid-connected Modular Multilevel Converters
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Optimization-based Cell Selection Method for Grid-connected Modular Multilevel Converters
- 1. NEXGEN TECHNOLOGY www.nexgenproject.com POWERELECTRONICS 2015-16 Optimization-based Cell Selection Method for Grid-connected Modular Multilevel Converters Modular multilevel converters (MMCs) are widely used in different applications. Due to low-loss operation, compactness and high modularity, MMC is extremely attractive for high voltage direct current (HVDC) transmission systems. The HVDC station loss is highly related to the converter switching pulse pattern which is generated by modulation algorithm and cell selection methods. This paper formulates the switching pulse pattern generation, as a versatile optimization problem. The problem constraints and objectives are formulated for HVDC applications and compared with similar problems in the field of computer science. To overcome the computational complexity in solving the introduced optimization problem, a heuristic method is proposed for cell selection algorithm. The method utilizes the current level in order to obtain lossless switching at zerocurrent crossings. The study of the proposed method, in a timedomain simulation platform, shows that the method can reduce the switching converter losses by 60% compared to carrierbased modulation, maintaining the same capacitor voltage ripple. Eventually, the practical functionality of the proposed method is verified in a real time digital simulator, RTDSr, for a 512-level converter in a point to point HVDC link. Although this paper focuses on HVDC, the mathematical model is applicable for any MMC application.