Synchronous control strategy of dual five‐level converters based on the improved SVPWM. Issue 14 (23rd October 2018)

• Record Type: Journal Article
• Authors: Zhu, Junjie; Sun, Xingfa; Nie, Ziling; Rui, Wanzhi; Han, Yi; Wu, Yanhao
• Is Part Of: IET power electronics. Volume 11:Issue 14(2018)
• Page Start: 2311
• Page End: 2318
• Publication Date: 2018-10-23
• Subjects: PWM power convertors -- synchronisation -- switching convertors; dual five‐level independent control method -- outpur pulse combinational‐encoding transmission -- target voltage vector synthesis method -- switching loss reduction -- switching rule analysis -- neutral point clamped five‐level converter topology -- NPC five‐level converter -- five‐level independent control method -- real‐time control -- dual single‐phase five‐level converters -- synchronous control method -- three‐segment SVPWM -- improved SVPWM strategy -- neutral‐point potential balancing algorithm -- space voltage vector diagram -- improved space vector pulse‐width modulation -- synchronous control strategy; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2018.5564
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : This Letter has proposed a synchronous control strategy of dual five‐level converters based on the improved space vector pulse‐width modulation (SVPWM). Firstly, the main topology of the neutral point clamped (NPC) five‐level converter was introduced and its operational principle was analysed. Then, the space voltage vector diagram was offered. Considering the reduction of switching loss, the optimisation of the synthesis method of target voltage vectors and the addition of the neutral‐point potential balancing algorithm can lead to an improved SVPWM strategy for the five‐level converter. The analysis of the switching rules proves that the improved SVPWM has an advantage over the traditional three‐segment SVPWM due to its fewer times of switching. On the basis of the improved SVPWM, a synchronous control method of dual single‐phase five‐level converters is proposed to carry out a real‐time control of the dual five‐level converters through the combinational‐encoding transmission of output pulses. Thus, the synchronous control method can, to a great extent, solve the problems caused by the traditional dual five‐level independent control method, such as high hardware cost, the complexity of control, and poor synchronous performance. Simulations and experiments show that the proposed synchronous control method is feasible and effective.